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Output a project based on HTML, css and js only, w...

Creato il: 14 ottobre 2025

Risposto usando GPT-5 Thinking da Chat01

Domanda

Output a project based on HTML, css and js only, which will have a chat interface for Gemini API. the main features is that, it will have datastructures which will hold data and checkpoints, divided into many categories.

-Memory: Small summary string, and its value contains detailed information that the model already stored. The model will have the summary passed with each iteration, and the model can select the index for the memory to fetch it if required.
-Immediate reasoning chain: Holds steps for continuous reasoning for a single reply. will automatically be passed on during each iterative reasoning process.
-Goals: COntains the goals and whatever, that the model has already stored in the beginning, to verify the final output. this will automatically be passed to the model. So, the model will think that it is outputting the final answer, but it wont be. this will be passed for verification, also, all the immediate reasoning data structure chain will also be passed so that it can verify. Then only it will be the final output.

-it will have a code execution environment that explicitly uses javascript only, and has proper and complete internet access. it can use that js environment as much as required. ALso, that will be the script directly executing inside the browser. No sandbox nothing. Directly in the browser. make sure that any kind of output from the js will be passed on to the model, or, the model can choose to include the output of the js directly to the final answer, using a variable in the final answer, which will be replaced by the project's script during the rendering.

-it will also have the canvas feature, which will display the html file for display. it can use that during the intermediate reasoning process too.

-also, the model's internal thought process that is chain of thoughts is different. there will also be a different iterative reasoning and tool use that is defined in this prompt, that the model must use. include proper prompts for each steps. Make sure you let the LLM know that, whatever there is available is inside the 'External Tools system'.

Design principle:- Swiss, minimalist, monochrome, mandatory geist fonts fetched from the internet.

Make sure that the identification for the models intention to use different tools is robust, the handling of everything is robust, the LLM would be aware of whats happening, and there must be 5 keys input for different keys, for when one API key has reached the rate limit. we have paid for 5 API keys. API keys will be stored in the localstorage so that each user has their own.

the thing is also that, make it stream and show output and make the page responsive in a sense. professional design with no emoji or stuff.

Pensiero

Considering project approach

The task involves creating a chat interface using only HTML, CSS, and JavaScript for the Gemini API. The structure requires memory data, real-time reasoning, and goal tracking for validation. However, incorporating full browser JS execution raises security concerns—allowing unrestrained code might expose vulnerabilities. Still, the user wants unrestricted control in this local app.

Thinking through security and features

Allowing arbitrary code execution in a browser poses significant risks, though not strictly prohibited. It’s important to warn about these security concerns. For the requested canvas feature, since canvas can't directly render HTML, I could use an iframe or SVG's <foreignObject> to simulate this. They don't want a sandbox, so direct execution is needed.

Considering implementation details

Using an iframe for rendering user HTML might be risky, but I can use a <div id="render"> where I set the innerHTML to safely display the content. Model’s internal thought process differs from iterative reasoning, so I must provide clear prompts for each step, letting the LLM understand tool use. The design requires a simple, responsive UI with a minimalist style and specific font. Streaming output and rotating API keys are also part of this.

Processing API integration

To implement a chat UI using the Gemini API with just HTML/JS, I can use fetch to call the API. However, I'd need an API key and consider potential CORS issues. It's possible CORS is allowed for Google’s Generative Language API, though exposing API keys is risky. Streaming would likely use SSE or WebSockets.

Planning the project structure

We’ll build a UI with a left-side configuration panel, including inputs for API keys, goals, memory management, and a JS console. We will implement streaming and handle tools like fetchMemory, run_js, and render_html, following the Gemini API’s limitations. Memory will be stored and used iteratively, with a verification loop for results. Streaming will parse SSE events for real-time updates. The design will reflect Swiss minimalist style, using Geist fonts and rotating keys to avoid overage.

Structuring the project

We’ll create a single HTML file with embedded CSS and JS. The user wants a responsive setup with no emojis, so we’ll focus on professional design. For the backend, we'll handle streaming and interaction with the Gemini API using correct request formats. We’ll also implement functionality for memory, tools, and variable management, with a minimal, stylish UI in Geist fonts. We'll ensure correct handling of keys, rate limits, and tool executions, flow control, and final output verification.

Handling projections and UI components

I’m thinking about how to manage fonts, ensuring fallback fonts if the Geist font doesn’t work. I'll craft the HTML with an @font-face for Geist and Geist Mono fonts. For functionality, I’ll set up a robust streaming UI, event log, memory handling, and interact with the model through proper function calls. I'll ensure the project delivers clean code and follows user experience guidelines. I'll use local storage for API keys and ensure concise, yet clear, UI elements for interactions.

Thought for 1m 38s

Risposta

Here’s a single-file, production-ready project (HTML/CSS/JS only) that delivers a Gemini-powered chat interface with:

  • Streaming responses
  • Five rotating API keys (stored in localStorage)
  • “External Tools system” with robust function calling:
    • Memory (summaries + fetch-by-index of details)
    • Immediate Reasoning Chain (IRC) for the current reply
    • Goals (for a final verification pass)
    • JavaScript code execution (runs directly in the browser, with network access)
    • Canvas/HTML renderer
    • Variable injection ({{var:NAME}}) into the final rendered answer
  • Swiss/minimalist/monochrome design using Geist fonts
  • Responsive layout

Note: Running arbitrary JS directly in your browser (as this explicitly enables) is powerful and risky. Only use keys and prompts you trust.

Save the following as index.html and open it locally in any modern browser.

html
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width,initial-scale=1" />
  <title>Gemini Chat • External Tools System</title>

  <!-- Geist Sans & Geist Mono (variable fonts). If these ever 404, update the URLs. -->
  <style>
    @font-face {
      font-family: "Geist";
      src: url("https://assets.vercel.com/raw/upload/v1699973030/fonts/geist/GeistVF.woff2") format("woff2");
      font-weight: 100 900;
      font-style: normal;
      font-display: swap;
    }
    @font-face {
      font-family: "Geist Mono";
      src: url("https://assets.vercel.com/raw/upload/v1699973030/fonts/geist/GeistMonoVF.woff2") format("woff2");
      font-weight: 100 900;
      font-style: normal;
      font-display: swap;
    }

    :root{
      --bg:#fff;
      --fg:#111;
      --muted:#6a6a6a;
      --line:#e7e7e7;
      --ring:#000;
    }
    *{box-sizing:border-box}
    html,body{height:100%}
    body{
      margin:0;
      font-family: "Geist",system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";
      background:var(--bg);
      color:var(--fg);
      -webkit-font-smoothing:antialiased;
      text-rendering:optimizeLegibility;
    }

    /* Layout */
    .grid{
      display:grid;
      grid-template-columns: 320px 1fr;
      min-height:100vh;
    }
    @media (max-width: 1100px){
      .grid{grid-template-columns:1fr}
      aside{order:2}
      main{order:1}
    }
    aside{
      border-right:1px solid var(--line);
      padding:20px;
    }
    main{
      display:flex;
      flex-direction:column;
      min-height:0;
    }

    /* Panels */
    .section{
      margin-bottom:24px;
    }
    .section h2{
      font-size:12px;
      letter-spacing:.08em;
      text-transform:uppercase;
      font-weight:600;
      margin:0 0 12px 0;
      color:var(--muted);
    }
    label{
      display:block;
      font-size:12px;
      color:var(--muted);
      margin-bottom:8px;
    }
    input[type="text"], textarea, select{
      width:100%;
      border:1px solid var(--line);
      background:#fff;
      color:var(--fg);
      padding:10px 12px;
      border-radius:8px;
      font:inherit;
      outline:none;
    }
    textarea{min-height:84px; resize:vertical}
    .row{display:flex; gap:8px}
    .btn{
      appearance:none;
      background:#fff;
      color:#000;
      border:1px solid #000;
      padding:10px 12px;
      border-radius:8px;
      font:inherit;
      cursor:pointer;
    }
    .btn:focus{outline:2px solid var(--ring); outline-offset:2px}
    .btn.secondary{border-color:var(--line); color:#111}
    .btn.ghost{border-color:transparent}

    /* Chat */
    .chat{
      display:flex;
      flex-direction:column;
      gap:12px;
      padding:20px;
      overflow:auto;
      flex:1;
    }
    .msg{
      border:1px solid var(--line);
      border-radius:12px;
      padding:16px;
      max-width:900px;
      white-space:pre-wrap;
      line-height:1.5;
    }
    .msg.user{margin-left:auto; background:#fafafa}
    .msg.model{margin-right:auto; background:#fff}
    .meta{font-size:12px; color:var(--muted); margin-bottom:8px}

    .composer{
      border-top:1px solid var(--line);
      padding:12px 20px;
      display:flex;
      gap:8px;
    }
    .composer textarea{min-height:48px}
    .grow{flex:1}

    /* Tool panes */
    .tools{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap:20px;
      border-top:1px solid var(--line);
      padding:20px;
    }
    @media (max-width:900px){ .tools{ grid-template-columns:1fr } }

    .card{
      border:1px solid var(--line);
      border-radius:12px;
      padding:16px;
    }
    .mono{font-family: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;}
    .log{background:#fafafa; border:1px solid var(--line); border-radius:8px; padding:10px; min-height:110px; overflow:auto}
    .pill{font-size:11px; border:1px solid var(--line); border-radius:999px; padding:2px 8px; display:inline-block; color:#333}

    .vars{display:flex; flex-wrap:wrap; gap:6px; margin-top:10px}
    .vars .kv{border:1px solid var(--line); border-radius:999px; padding:4px 10px; font-size:12px}
    .divider{height:1px; background:var(--line); margin:16px 0}
    .small{font-size:12px; color:var(--muted)}

    .kbd{font-family:"Geist Mono"; border:1px solid var(--line); border-radius:6px; padding:2px 6px; font-size:12px}
  </style>
</head>
<body>
<div class="grid">
  <aside>
    <div class="section">
      <h2>Model & Keys</h2>
      <label>Model
        <select id="model">
          <option value="gemini-1.5-pro-latest">gemini-1.5-pro-latest</option>
          <option value="gemini-1.5-flash-latest">gemini-1.5-flash-latest</option>
        </select>
      </label>
      <div class="divider"></div>
      <label>API Keys (rotates on rate limits)</label>
      <div class="row" style="gap:6px; margin-bottom:8px">
        <input id="key1" type="text" placeholder="Key 1" />
        <input id="key2" type="text" placeholder="Key 2" />
      </div>
      <div class="row" style="gap:6px; margin-bottom:8px">
        <input id="key3" type="text" placeholder="Key 3" />
        <input id="key4" type="text" placeholder="Key 4" />
      </div>
      <div class="row" style="gap:6px">
        <input id="key5" type="text" placeholder="Key 5" />
        <button class="btn" id="saveKeys">Save</button>
      </div>
      <div class="small" style="margin-top:8px">Keys are stored in your browser’s <span class="kbd">localStorage</span>.</div>
    </div>

    <div class="section">
      <h2>Session Goals</h2>
      <textarea id="goals" placeholder="State goals that must be satisfied by the final answer. These are always provided to the model for verification."></textarea>
      <div class="row" style="margin-top:8px">
        <button class="btn secondary" id="saveGoals">Save</button>
        <button class="btn ghost" id="clearGoals">Clear</button>
      </div>
    </div>

    <div class="section">
      <h2>Memory</h2>
      <label>Summary (short)</label>
      <input id="memSummary" type="text" placeholder="e.g., 'User prefs'" />
      <label style="margin-top:8px">Value (detailed)</label>
      <textarea id="memValue" placeholder="Detailed facts the model may fetch by index."></textarea>
      <div class="row" style="margin-top:8px">
        <button class="btn secondary" id="addMemory">Add Memory</button>
        <button class="btn ghost" id="clearMemory">Clear</button>
      </div>
      <div id="memoryList" class="small" style="margin-top:10px"></div>
    </div>

    <div class="section">
      <h2>Run</h2>
      <label>Temperature</label>
      <input id="temp" type="text" placeholder="0.0 – 1.0" value="0.3" />
      <div class="row" style="margin-top:8px">
        <button class="btn" id="newThread">New Thread</button>
      </div>
    </div>
  </aside>

  <main>
    <div class="chat" id="chat"></div>

    <div class="composer">
      <textarea id="prompt" class="grow" placeholder="Ask anything… The External Tools system is available."></textarea>
      <button class="btn" id="send">Send</button>
    </div>

    <div class="tools">
      <div class="card">
        <div class="row" style="justify-content:space-between; align-items:center">
          <h3 style="margin:0; font-size:14px">JavaScript Execution</h3>
          <span class="pill">Tool: run_js</span>
        </div>
        <div class="small" style="margin:6px 0 10px">Runs directly in your browser. Network requests via <span class="kbd">fetch</span> are allowed.</div>
        <textarea id="jsCode" class="mono" placeholder="// Example:
// const res = await fetch('https://httpbin.org/json').then(r => r.json());
// console.log(res.slideshow.title);
// return {title: res.slideshow.title};"></textarea>
        <div class="row" style="margin-top:8px">
          <button class="btn secondary" id="runJS">Run JS</button>
          <button class="btn ghost" id="clearJS">Clear</button>
        </div>
        <div class="divider"></div>
        <div class="small">Console & result:</div>
        <div id="jsLog" class="log mono"></div>
        <div class="vars" id="varList"></div>
      </div>

      <div class="card">
        <div class="row" style="justify-content:space-between; align-items:center">
          <h3 style="margin:0; font-size:14px">Canvas (HTML Renderer)</h3>
          <span class="pill">Tool: render_html</span>
        </div>
        <div class="small" style="margin:6px 0 10px">Render HTML during intermediate reasoning or as part of the answer.</div>
        <textarea id="htmlCanvasInput" class="mono" placeholder="<!-- Example -->
<div style='padding:24px;border:1px solid #ddd;border-radius:12px'>
  <h1 style='margin:0 0 8px 0;font-size:20px'>Hello Canvas</h1>
  <p>This is rendered directly into the canvas region.</p>
</div>"></textarea>
        <div class="row" style="margin-top:8px">
          <button class="btn secondary" id="renderHTML">Render</button>
          <button class="btn ghost" id="clearCanvas">Clear</button>
        </div>
        <div class="divider"></div>
        <div id="canvas" class="log"></div>
      </div>

      <div class="card">
        <div class="row" style="justify-content:space-between; align-items:center">
          <h3 style="margin:0; font-size:14px">Tool Log</h3>
          <span class="pill">Intention & Calls</span>
        </div>
        <div id="toolLog" class="log mono"></div>
        <div class="small" style="margin-top:8px">
          The model can call tools via function calling. All calls and results are recorded here.
        </div>
      </div>

      <div class="card">
        <div class="row" style="justify-content:space-between; align-items:center">
          <h3 style="margin:0; font-size:14px">Immediate Reasoning Chain</h3>
          <span class="pill">IRC (auto-passed)</span>
        </div>
        <div id="ircList" class="log mono"></div>
        <div class="small" style="margin-top:8px">The model can append steps with <span class="kbd">irc_add</span>. IRC is auto-supplied on each iteration and used in the goals verification pass.</div>
      </div>
    </div>
  </main>
</div>

<script>
/* ============ Storage & State ============ */
const els = {
  model: document.getElementById('model'),
  keyInputs: [1,2,3,4,5].map(n=>document.getElementById('key'+n)),
  saveKeys: document.getElementById('saveKeys'),
  temp: document.getElementById('temp'),
  send: document.getElementById('send'),
  newThread: document.getElementById('newThread'),
  chat: document.getElementById('chat'),
  prompt: document.getElementById('prompt'),
  goals: document.getElementById('goals'),
  saveGoals: document.getElementById('saveGoals'),
  clearGoals: document.getElementById('clearGoals'),
  memSummary: document.getElementById('memSummary'),
  memValue: document.getElementById('memValue'),
  addMemory: document.getElementById('addMemory'),
  clearMemory: document.getElementById('clearMemory'),
  memoryList: document.getElementById('memoryList'),
  runJS: document.getElementById('runJS'),
  clearJS: document.getElementById('clearJS'),
  jsCode: document.getElementById('jsCode'),
  jsLog: document.getElementById('jsLog'),
  renderHTML: document.getElementById('renderHTML'),
  clearCanvas: document.getElementById('clearCanvas'),
  htmlCanvasInput: document.getElementById('htmlCanvasInput'),
  canvas: document.getElementById('canvas'),
  toolLog: document.getElementById('toolLog'),
  varList: document.getElementById('varList'),
  ircList: document.getElementById('ircList'),
};

const state = {
  history: [], // [{role:'user'|'model'|'tool', parts:[{text}|{functionResponse}|{functionCall}] }]
  irc: [],     // Immediate Reasoning Chain (per thread)
  memories: [],// [{summary, value, ts}]
  variables: {}, // name -> value
  goals: '',
  keyIndex: 0
};

function loadFromStorage(){
  const keys = JSON.parse(localStorage.getItem('gemini_keys')||'[]');
  keys.forEach((k,i)=>{ if(els.keyInputs[i]) els.keyInputs[i].value = k; });
  state.goals = localStorage.getItem('goals') || '';
  els.goals.value = state.goals;
  state.memories = JSON.parse(localStorage.getItem('memories')||'[]');
  renderMemories();
  renderVars();
  renderIRC();
}
function saveKeys(){
  const keys = els.keyInputs.map(i=>i.value.trim()).filter(Boolean);
  localStorage.setItem('gemini_keys', JSON.stringify(keys));
  logTool('system','Saved API keys ('+keys.length+')');
}
function saveGoals(){
  state.goals = els.goals.value.trim();
  localStorage.setItem('goals', state.goals);
  logTool('system','Saved goals');
}
function clearGoals(){
  state.goals = '';
  els.goals.value = '';
  localStorage.removeItem('goals');
  logTool('system','Cleared goals');
}
function addMemory(){
  const s = els.memSummary.value.trim();
  const v = els.memValue.value.trim();
  if(!s || !v) return;
  state.memories.push({summary:s, value:v, ts:Date.now()});
  els.memSummary.value=''; els.memValue.value='';
  localStorage.setItem('memories', JSON.stringify(state.memories));
  renderMemories();
}
function clearMemory(){
  state.memories = [];
  localStorage.removeItem('memories');
  renderMemories();
  logTool('system','Cleared memory store');
}
function renderMemories(){
  if(!state.memories.length){ els.memoryList.innerHTML = '<div class="small">No memory items yet.</div>'; return; }
  els.memoryList.innerHTML = state.memories.map((m,i)=>(
    `<div style="margin-bottom:10px">
      <div><span class="pill">#${i}</span> <strong>${escapeHtml(m.summary)}</strong></div>
      <div class="small mono" style="margin-top:4px; white-space:pre-wrap">${escapeHtml(m.value)}</div>
    </div>`
  )).join('');
}
function renderIRC(){
  els.ircList.textContent = state.irc.length ? state.irc.map((s,i)=>`${i+1}. ${s}`).join('\n') : '(empty)';
}
function renderVars(){
  const entries = Object.entries(state.variables);
  els.varList.innerHTML = entries.length ? entries.map(([k,v])=>`<span class="kv mono">${escapeHtml(k)} = ${escapeHtml(String(v))}</span>`).join('') : '';
}

/* ============ UI Helpers ============ */
function el(tag, cls){ const e=document.createElement(tag); if(cls) e.className=cls; return e; }
function addMsg(role, content, streaming=false){
  const wrap = el('div','msg '+role);
  const meta = el('div','meta'); meta.textContent = role==='user'?'You':'Model';
  const pre = el('div'); pre.className = 'mono'; pre.style.whiteSpace='pre-wrap';
  pre.textContent = content || '';
  wrap.appendChild(meta); wrap.appendChild(pre);
  els.chat.appendChild(wrap);
  els.chat.scrollTop = els.chat.scrollHeight;
  return {wrap, pre, set:(t)=>{ pre.textContent=t; }};
}
function updateLastMsg(pre, text){ pre.textContent = text; els.chat.scrollTop = els.chat.scrollHeight; }
function logTool(who, text){
  const line = `[${new Date().toLocaleTimeString()}] ${who.toUpperCase()}: ${text}\n`;
  els.toolLog.textContent += line;
  els.toolLog.scrollTop = els.toolLog.scrollHeight;
}

/* ============ JS Execution Env (no sandbox, full browser JS) ============ */
async function runUserJS(src, fromTool=false){
  els.jsLog.textContent = ''; // reset for clarity
  const originalLog = console.log;
  let logs=[];
  console.log = (...args)=>{ logs.push(args.map(a=>toDisplay(a)).join(' ')); originalLog(...args); };
  try{
    // Support top-level await: wrap in async function
    const fn = new Function(`return (async ()=>{ ${src}\n })()`);
    const result = await fn();
    console.log = originalLog;
    const out = { logs, result };
    els.jsLog.textContent = logs.map(l=>'• '+l).join('\n') + (result!==undefined?`\n\nreturn → ${toDisplay(result)}`:'');
    logTool('run_js', `Executed (${src.length} chars)`);
    return out;
  }catch(err){
    console.log = originalLog;
    els.jsLog.textContent = (logs.length?logs.map(l=>'• '+l).join('\n')+'\n\n':'') + 'ERROR → ' + String(err && err.stack || err);
    logTool('run_js', `Error: ${String(err)}`);
    return { logs, error: String(err) };
  }
}
els.runJS.onclick = async ()=>{
  const code = els.jsCode.value;
  const out = await runUserJS(code);
  // If the JS returns an object, allow promoting keys to variables
  if(out && out.result && typeof out.result === 'object'){
    Object.entries(out.result).forEach(([k,v])=>{ state.variables[k]=v; });
    renderVars();
  }
};
els.clearJS.onclick = ()=>{ els.jsCode.value=''; els.jsLog.textContent=''; };

/* Canvas HTML renderer */
function renderCanvas(html){
  els.canvas.innerHTML = html;
  logTool('render_html','Updated canvas');
}
els.renderHTML.onclick = ()=> renderCanvas(els.htmlCanvasInput.value);
els.clearCanvas.onclick = ()=> renderCanvas('');

/* ============ Gemini Function Declarations (Tools) ============ */
const functionDeclarations = [
  {
    name: "fetch_memory",
    description: "Fetch a detailed memory by index from provided memory summaries.",
    parameters: { type:"OBJECT", properties:{ index:{type:"INTEGER"} }, required:["index"] }
  },
  {
    name: "list_memories",
    description: "List available memory summaries with indices.",
    parameters: { type:"OBJECT", properties:{} }
  },
  {
    name: "irc_add",
    description: "Append one step to the Immediate Reasoning Chain for the current reply.",
    parameters: { type:"OBJECT", properties:{ step:{type:"STRING"} }, required:["step"] }
  },
  {
    name: "run_js",
    description: "Execute JavaScript in the user's browser. Return logs and result. Use for browsing the web via fetch, parsing, compute, etc.",
    parameters: { type:"OBJECT", properties:{ code:{type:"STRING"} }, required:["code"] }
  },
  {
    name: "render_html",
    description: "Render HTML into the canvas region for previews or interactive reasoning.",
    parameters: { type:"OBJECT", properties:{ html:{type:"STRING"} }, required:["html"] }
  },
  {
    name: "set_var",
    description: "Set a named variable for later injection into the final answer using {{var:NAME}} placeholders.",
    parameters: { type:"OBJECT", properties:{ name:{type:"STRING"}, value:{type:"STRING"} }, required:["name","value"] }
  },
  {
    name: "get_var",
    description: "Get a named variable value previously set.",
    parameters: { type:"OBJECT", properties:{ name:{type:"STRING"} }, required:["name"] }
  },
  {
    name: "list_tools",
    description: "Return a short list of available tools and when to use them.",
    parameters: { type:"OBJECT", properties:{} }
  }
];

/* ============ System Instruction ============ */
function buildSystemInstruction(){
  const memorySummaries = state.memories.map((m,i)=>`#${i}: ${m.summary}`).join('\n') || '(none)';
  const ircSoFar = state.irc.length ? state.irc.map((s,i)=>`${i+1}. ${s}`).join('\n') : '(empty)';
  const goals = state.goals || '(none)';

  return [
`You are a helpful model with access to an External Tools system. You must *not* reveal chain-of-thought. Use the provided tools when helpful. Work iteratively: plan → (optionally call tools) → draft → verify against goals → final.`,
`DATA STRUCTURES:
• Memory: You are given only memory *summaries*. If a memory is needed, call fetch_memory({index}). You may first call list_memories() to see indices. Do NOT assume details you haven’t fetched.
• Immediate Reasoning Chain (IRC): For the current reply only. When you plan or refine steps, append short steps with irc_add({step}). IRC is automatically supplied on subsequent iterations and in the verification pass.
• Goals: Global constraints to satisfy in the final answer. The system runs your draft through a verification pass with these Goals plus the IRC. Treat your initial draft as provisional.

TOOLS:
• run_js({code}): Executes real JavaScript in the user's browser (with network access via fetch). Use for web requests, data processing, etc. Return value becomes available to you.
• render_html({html}): Render HTML into a visible canvas to aid intermediate reasoning or previews.
• set_var({name,value}) / get_var({name}): Manage variables for final answer injection. Use placeholders in your text like {{var:NAME}}.
• fetch_memory({index}), list_memories(), irc_add({step}), list_tools().

OUTPUT PROTOCOL:
• Do not output chain-of-thought. Summarize reasoning at a high level if needed.
• If you want to include JS-produced content in your final answer, store it into a variable (set_var) and reference it via {{var:NAME}}.

SUPPLIED CONTEXT (ALWAYS):
• Memory Summaries:
${memorySummaries}

• Immediate Reasoning Chain (IRC) so far:
${ircSoFar}

• Goals:
${goals}

Follow the above exactly.`
  ].join('\n\n');
}

/* ============ Gemini Streaming ============ */
function getKeys(){ return JSON.parse(localStorage.getItem('gemini_keys')||'[]'); }
function getActiveKey(){ const keys=getKeys(); if(!keys.length) throw new Error('No API key found'); return keys[state.keyIndex % keys.length]; }
function rotateKey(){ state.keyIndex = (state.keyIndex+1) % Math.max(1,getKeys().length); }

async function sseRequest(payload){
  const model = els.model.value;
  let attempts = 0, maxAttempts = Math.max(1, getKeys().length);

  while(attempts < maxAttempts){
    const key = getActiveKey();
    const url = `https://generativelanguage.googleapis.com/v1beta/models/${encodeURIComponent(model)}:streamGenerateContent?alt=sse&key=${encodeURIComponent(key)}`;
    const res = await fetch(url, {
      method:'POST',
      headers: {'Content-Type':'application/json'},
      body: JSON.stringify(payload)
    });

    if(res.status===429 || res.status===503){
      logTool('system', `Rate limit or service busy (HTTP ${res.status}). Rotating key...`);
      rotateKey(); attempts++; continue;
    }
    if(!res.ok){
      const text = await res.text();
      throw new Error(`Gemini error ${res.status}: ${text}`);
    }

    return res.body; // ReadableStream (SSE)
  }
  throw new Error('All API keys exhausted due to rate limits.');
}

async function* readSSE(stream){
  const reader = stream.getReader();
  const decoder = new TextDecoder('utf-8');
  let buf = '';
  while(true){
    const {value, done} = await reader.read();
    if(done) break;
    buf += decoder.decode(value, {stream:true});
    let idx;
    while((idx = buf.indexOf('\n\n'))>=0){
      const chunk = buf.slice(0, idx).trim();
      buf = buf.slice(idx+2);
      const lines = chunk.split('\n').map(s=>s.trim());
      const dataLines = lines.filter(l=>l.startsWith('data:')).map(l=>l.slice(5).trim());
      for(const dl of dataLines){
        if(dl === '[DONE]' || dl === '') continue;
        try{ yield JSON.parse(dl); }catch(e){ /* ignore */ }
      }
    }
  }
}

/* Extract text and tool calls from a streamed event object */
function extractParts(evt){
  const out = { textDelta:'', toolCalls:[] };
  const cands = evt.candidates || [];
  for(const c of cands){
    const parts = (c.content && c.content.parts) || [];
    for(const p of parts){
      if(p.text) out.textDelta += p.text;
      if(p.functionCall) out.toolCalls.push(p.functionCall);
    }
  }
  return out;
}

/* ============ Tool Execution (Browser-side) ============ */
function toolResponseContent(name, response){
  return {
    role: "tool",
    parts: [
      {
        functionResponse: {
          name,
          response: (typeof response === 'object' && response!==null) ? response : { data: String(response) }
        }
      }
    ]
  };
}

async function execTool(call){
  const {name, args} = call;
  try{
    switch(name){
      case 'list_tools': {
        const tools = [
          {name:'fetch_memory(index)', use:'Retrieve detailed memory by index'},
          {name:'list_memories()', use:'List memory summaries and indices'},
          {name:'irc_add(step)', use:'Append one planning/validation step'},
          {name:'run_js(code)', use:'Execute JS in browser; can fetch the internet'},
          {name:'render_html(html)', use:'Render HTML in canvas'},
          {name:'set_var(name,value) / get_var(name)', use:'Manage variables for {{var:NAME}} replacement'}
        ];
        logTool('tool', 'list_tools called');
        return toolResponseContent('list_tools', { tools });
      }
      case 'list_memories': {
        const summaries = state.memories.map((m,i)=>({index:i, summary:m.summary}));
        logTool('tool','list_memories called');
        return toolResponseContent('list_memories', { summaries });
      }
      case 'fetch_memory': {
        const i = Number(args?.index);
        if(Number.isNaN(i) || i<0 || i>=state.memories.length) throw new Error('Invalid memory index');
        logTool('tool',`fetch_memory #${i}`);
        return toolResponseContent('fetch_memory', { index:i, value: state.memories[i].value, summary: state.memories[i].summary });
      }
      case 'irc_add': {
        const step = String(args?.step||'').slice(0, 500);
        if(step) state.irc.push(step);
        renderIRC();
        logTool('tool',`irc_add "${step}"`);
        return toolResponseContent('irc_add', { ok:true, length: state.irc.length });
      }
      case 'run_js': {
        const code = String(args?.code||'');
        logTool('tool',`run_js (${code.length} chars)`);
        const out = await runUserJS(code, true);
        // promote any object keys to variables for convenience?
        if(out && out.result && typeof out.result === 'object'){
          Object.entries(out.result).forEach(([k,v])=>{ state.variables[k]=v; });
          renderVars();
        }
        return toolResponseContent('run_js', out);
      }
      case 'render_html': {
        const html = String(args?.html||'');
        renderCanvas(html);
        return toolResponseContent('render_html', { ok:true });
      }
      case 'set_var': {
        const name = String(args?.name||'').trim();
        const value = String(args?.value ?? '');
        if(!name) throw new Error('name required');
        state.variables[name] = value;
        renderVars();
        logTool('tool',`set_var ${name}`);
        return toolResponseContent('set_var', { ok:true });
      }
      case 'get_var': {
        const name = String(args?.name||'').trim();
        const value = state.variables[name];
        logTool('tool',`get_var ${name}`);
        return toolResponseContent('get_var', { name, value: value ?? null });
      }
      default:
        logTool('tool',`Unknown tool: ${name}`);
        return toolResponseContent(name, { error:`Unknown tool ${name}` });
    }
  }catch(err){
    logTool('tool',`Error in ${name}: ${String(err)}`);
    return toolResponseContent(name, { error:String(err) });
  }
}

/* ============ Chat Loop (tool-using, then verification) ============ */
function buildUserContent(text){
  return {
    role: "user",
    parts: [{ text }]
  };
}
function buildSystem(systemText){
  return { role:"user", parts:[{text: systemText}] }; // systemInstruction is separate, but we also include a lightweight reminder in contents.
}
function buildPayload(contents){
  return {
    systemInstruction: { role:"user", parts:[{text: buildSystemInstruction()}] },
    tools: [{ functionDeclarations }],
    contents,
    generationConfig: {
      temperature: Number(els.temp.value || '0.3'),
      candidateCount: 1
    },
    safetySettings: [] // allow caller to decide; keep empty for neutral defaults
  };
}

async function toolIteration(conversation){
  // One iteration: request, stream text, collect tool calls; if tool calls, execute and return {updatedConversation, draftText}
  const payload = buildPayload(conversation);
  const stream = await sseRequest(payload);
  let draft = '';
  for await (const evt of readSSE(stream)){
    const {textDelta, toolCalls} = extractParts(evt);
    if(textDelta){ draft += textDelta; yield { type:'delta', text: textDelta }; }
    if(toolCalls && toolCalls.length){
      // Finish current stream and execute tools sequentially
      for(const call of toolCalls){
        yield { type:'tool_call', call };
        const toolContent = await execTool(call);
        conversation.push(toolContent);
      }
    }
  }
  yield { type:'done', draft, conversation };
}

async function runChatTurn(userText){
  // 1) Push user
  const userContent = buildUserContent(userText);
  state.history.push(userContent);

  // 2) Tool loop until we have a complete draft with no outstanding tool calls
  let conversation = [...state.history, buildSystem('Use tools as needed, then provide a draft.')];
  const modelMsg = addMsg('model',''); // streaming target

  for await (const event of toolIteration(conversation)){
    if(event.type==='delta'){ modelMsg.set((modelMsg.pre.textContent||'') + event.text); }
    if(event.type==='tool_call'){ /* already logged */ }
    if(event.type==='done'){
      // done streaming for this iteration; update conversation and draft
      conversation = event.conversation;
      var draftText = event.draft;
    }
  }

  // Append model draft to history
  state.history.push({ role:'model', parts:[{text:draftText||''}] });

  // 3) Verification pass against Goals + IRC
  const verifyMsg = addMsg('model',''); // show verification result as the *final* message
  const verifyPrompt = [
    'VERIFY AGAINST GOALS.',
    'Given the previous draft answer, STRICTLY check it against the Goals and the IRC (steps).',
    'If the draft fully satisfies all goals, return a concise, professional FINAL answer.',
    'Otherwise, revise it to satisfy all goals and return only the revised FINAL answer.',
    'Do NOT include analysis. Do NOT mention verification.',
    'If the draft used variables like {{var:NAME}}, keep those placeholders intact.'
  ].join(' ');
  const verifyConversation = [
    ...state.history,
    { role:'user', parts:[{text: verifyPrompt}] }
  ];

  // Stream verification result
  const payload = buildPayload(verifyConversation);
  const verifyStream = await sseRequest(payload);
  let verified = '';
  for await (const evt of readSSE(verifyStream)){
    const {textDelta} = extractParts(evt);
    if(textDelta){ verified += textDelta; verifyMsg.set((verifyMsg.pre.textContent||'') + textDelta); }
  }

  // 4) Perform variable injection on the verified text and replace the rendered bubble
  const injected = verified.replace(/\{\{var:([\w\-]+)\}\}/g, (_,name)=> String(state.variables[name] ?? ''));
  verifyMsg.set(injected);

  // 5) Save final model message
  state.history.push({ role:'model', parts:[{text: injected}] });
}

/* ============ Actions ============ */
els.send.onclick = async ()=>{
  const text = els.prompt.value.trim();
  if(!text) return;
  const yourMsg = addMsg('user', text);
  els.prompt.value='';
  try{
    await runChatTurn(text);
  }catch(err){
    const e = addMsg('model', 'Error: ' + String(err && err.message || err));
  }
};

els.newThread.onclick = ()=>{
  state.history = [];
  state.irc = [];
  renderIRC();
  els.chat.innerHTML = '';
  logTool('system','Started a new thread');
};

els.saveKeys.onclick = saveKeys;
els.saveGoals.onclick = saveGoals;
els.clearGoals.onclick = clearGoals;
els.addMemory.onclick = addMemory;
els.clearMemory.onclick = clearMemory;

window.addEventListener('load', loadFromStorage);

/* ============ Utility ============ */
function escapeHtml(s){ return String(s).replace(/[&<>"']/g, m=>({ '&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#039;' }[m])); }
function toDisplay(v){
  try{ if(typeof v==='string') return v; return JSON.stringify(v, null, 2); }
  catch{ return String(v); }
}
</script>
</body>
</html>

How it works (quick start)

  1. Paste up to five Gemini API keys and Save.
  2. Define Goals (used for the final verification pass).
  3. Add Memory items: short Summary + detailed Value. The model only sees summaries until it calls fetch_memory(index).
  4. Type a prompt and Send.
    • The model may call tools (run_js, render_html, irc_add, etc.). All calls show up in Tool Log.
    • It streams a draft, then a verification pass runs automatically against Goals + IRC to produce the final.
    • If the draft used placeholders like {{var:TITLE}}, they’re replaced with values from the Variables store (set via set_var or returned by run_js).
  5. Use the JavaScript Execution pane to run any code directly in the browser (including network fetch). Returned object keys are promoted to variables.
  6. Use the Canvas pane to render intermediate HTML or final previews.

This is intentionally strict, monochrome, and Swiss-clean, with Geist fonts, responsive layout, streaming, robust tool-intent handling via function calling, five-key rate-limit rotation, and the requested data structures (Memory / IRC / Goals) wired into the prompting and control flow.

Domanda

Yea, now, i want you to only output the javascript, with much more robustness, much more features, which i will directly paste inside the script tags in the current html page. So, include usage quota limit and usage too, and stuff like that. Use gemini-2.5-flash-latest model

Pensiero

Considering HTML & JavaScript Integration

They want to paste JS into the current page, so I need to reference the existing HTML layout. I'll override the model selection to set it to "gemini-2.5-flash-latest" directly instead of relying on the model dropdown. I’ll make sure to highlight possible risks of running arbitrary JS and stress professional use.

Evaluating Feature Additions

I’m thinking of adding features like quota tracking, request tracing, offline detection, and cancellation. The user didn't ask for UI output, but they do want to see usage details. I can't alter the main DOM unless elements exist, so I’ll either log the details or append to the toolLog ID.

Planning Usage Quota Feature

They’ve asked to include usage quota and limits, so I'll store counts per key and day, allowing them to edit via localStorage. I’ll display this info in the tool log and append to an aside section—if those elements exist. The code will handle missing elements gracefully, use placeholders, and ensure reliable error handling.

Handling Key Rotation & Quotas

I’ll add handling for 401/403 errors, key rotation, and margin for usage quotas (per minute and day). The quota will default to 60 requests per minute and 10k per day, adjustable by the user. If quotas are exhausted, the system will rotate keys. I'll track recursion and ensure there's a cancellation mechanism, too.

Thought for 41s

Risposta

javascript
/* 
  Drop-in JS for the existing HTML. Robust Gemini chat runtime featuring:
  - Model: gemini-2.5-flash-latest (forced)
  - Streaming with SSE, retries, exponential backoff + jitter, abort/cancel
  - Five-key rotation (localStorage) with per-key circuit breakers
  - Quota + usage tracking (per key and session) with simple RPM/day budgets
  - Memory summaries + on-demand memory fetch
  - Immediate Reasoning Chain (IRC) for the current reply
  - Goals verification pass (auto)
  - External Tools: run_js, render_html, set_var/get_var, list_memories/fetch_memory, list_tools
  - JS execution (runs in the page; network access via fetch)
  - Canvas HTML renderer
  - {{var:NAME}} variable injection
  - Responsive to missing DOM (graceful no-ops)

  SECURITY NOTE: This enables arbitrary JS execution in your browser.
  Only run trusted prompts and code.
*/

(() => {
  "use strict";

  /* ========================= DOM HOOKS (graceful if absent) ========================= */
  const q = (id) => document.getElementById(id);
  const els = {
    aside: document.querySelector('aside'),
    model: q('model'),
    keyInputs: [1, 2, 3, 4, 5].map((n) => q('key' + n)).filter(Boolean),
    saveKeys: q('saveKeys'),
    temp: q('temp'),
    send: q('send'),
    newThread: q('newThread'),
    chat: q('chat'),
    prompt: q('prompt'),
    goals: q('goals'),
    saveGoals: q('saveGoals'),
    clearGoals: q('clearGoals'),
    memSummary: q('memSummary'),
    memValue: q('memValue'),
    addMemory: q('addMemory'),
    clearMemory: q('clearMemory'),
    memoryList: q('memoryList'),
    runJS: q('runJS'),
    clearJS: q('clearJS'),
    jsCode: q('jsCode'),
    jsLog: q('jsLog'),
    renderHTML: q('renderHTML'),
    clearCanvas: q('clearCanvas'),
    htmlCanvasInput: q('htmlCanvasInput'),
    canvas: q('canvas'),
    toolLog: q('toolLog'),
    varList: q('varList'),
    ircList: q('ircList'),
  };

  /* ========================= CONSTANTS ========================= */
  const DEFAULT_MODEL = "gemini-2.5-flash-latest"; // forced
  const GEMINI_BASE = "https://generativelanguage.googleapis.com/v1beta";
  const STREAM_ENDPOINT = (model, key) =>
    `${GEMINI_BASE}/models/${encodeURIComponent(model)}:streamGenerateContent?alt=sse&key=${encodeURIComponent(
      key
    )}`;

  // Quotas: simple local budgets; tune as needed
  const DEFAULT_QUOTAS = {
    rpm: 60,         // requests per minute per key
    daily: 10000,    // max requests per day per key
    sessionMax: 5000 // max requests this page-load (all keys)
  };

  // Retry/backoff
  const MAX_TOOL_ITERATIONS = 8; // avoid infinite tool loops
  const MAX_RETRY_PER_CALL = 3;
  const BASE_BACKOFF_MS = 600;   // exponential backoff base
  const JITTER_MS = 400;         // random jitter cap
  const CIRCUIT_BREAK_MS = 60_000; // if a key hard-fails, pause it for this long

  // Keys storage
  const KEYS_STORAGE = "gemini_keys"; // array of keys
  const GOALS_STORAGE = "goals";
  const MEMS_STORAGE = "memories";
  const QUOTA_STORAGE = "gemini_quota_config"; // optional user override

  /* ========================= STATE ========================= */
  const state = {
    // conversation
    history: [], // Gemini "contents"
    irc: [],     // Immediate Reasoning Chain
    memories: [], // [{summary, value, ts}]
    variables: {}, // name->value, available to {{var:NAME}} injection

    // model + generation
    temperature: 0.3,

    // keys + usage
    keyIndex: 0,
    circuit: {}, // key -> { openUntil: timestamp }
    usage: {
      session: { requests: 0, inChars: 0, outChars: 0, startedAt: Date.now() },
      perKey: {} // keyHash -> { day:'YYYY-MM-DD', dailyRequests, minuteWindowStart, minuteCount, totalRequests, inChars, outChars }
    },

    // control
    inFlight: null, // { aborter, kind: 'draft'|'verify' }
    model: DEFAULT_MODEL
  };

  /* ========================= UTILITIES ========================= */
  const now = () => Date.now();
  const toISODate = (ms) => new Date(ms).toISOString().slice(0, 10);
  const hashKey = (k) => {
    // Lightweight obfuscation for local usage mapping
    let h = 0;
    for (let i = 0; i < k.length; i++) h = (h * 31 + k.charCodeAt(i)) | 0;
    return "k" + (h >>> 0).toString(16);
  };

  const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
  const jitter = () => Math.floor(Math.random() * JITTER_MS);

  function el(tag, cls) {
    const e = document.createElement(tag);
    if (cls) e.className = cls;
    return e;
  }
  function escapeHtml(s) {
    return String(s).replace(/[&<>"']/g, (m) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#039;" }[m]));
  }
  function asDisplay(v) {
    try {
      if (typeof v === "string") return v;
      return JSON.stringify(v, null, 2);
    } catch {
      return String(v);
    }
  }
  function clamp(n, lo, hi) {
    return Math.max(lo, Math.min(hi, n));
  }

  /* ========================= LOGGING ========================= */
  function logTool(who, text) {
    const line = `[${new Date().toLocaleTimeString()}] ${who.toUpperCase()}: ${text}\n`;
    if (els.toolLog) {
      els.toolLog.textContent += line;
      els.toolLog.scrollTop = els.toolLog.scrollHeight;
    } else {
      console.log(line.trim());
    }
  }

  function ensureUsagePanel() {
    if (!els.aside) return null;
    let panel = q('usagePanel');
    if (panel) return panel;
    panel = el('div', 'section');
    panel.id = 'usagePanel';
    panel.innerHTML = `
      <h2>Usage</h2>
      <div id="usageSummary" class="small mono"></div>
      <div id="usageKeys" class="small mono" style="margin-top:6px"></div>
    `;
    els.aside.appendChild(panel);
    return panel;
  }

  function updateUsageUI() {
    const panel = ensureUsagePanel();
    const session = state.usage.session;
    const sumEl = q('usageSummary');
    const keysEl = q('usageKeys');
    const quota = getQuotaConfig();
    if (sumEl) {
      sumEl.textContent =
        `Session requests: ${session.requests} / ${quota.sessionMax} | In chars: ${session.inChars} | Out chars: ${session.outChars}`;
    }
    if (keysEl) {
      const lines = [];
      for (const [kh, v] of Object.entries(state.usage.perKey)) {
        lines.push(`${kh}: day ${v.day} | daily ${v.dailyRequests}/${quota.daily} | minute ${v.minuteCount}/${quota.rpm} | total ${v.totalRequests}`);
      }
      keysEl.textContent = lines.join('\n') || '(no key usage yet)';
    }
  }

  /* ========================= UI HELPERS ========================= */
  function addMsg(role, content) {
    if (!els.chat) return { pre: { textContent: '' }, set: () => {} };
    const wrap = el("div", "msg " + role);
    const meta = el("div", "meta");
    meta.textContent = role === "user" ? "You" : "Model";
    const pre = el("div");
    pre.className = "mono";
    pre.style.whiteSpace = "pre-wrap";
    pre.textContent = content || "";
    wrap.appendChild(meta);
    wrap.appendChild(pre);
    els.chat.appendChild(wrap);
    els.chat.scrollTop = els.chat.scrollHeight;
    return { pre, set: (t) => { pre.textContent = t; els.chat.scrollTop = els.chat.scrollHeight; } };
  }

  function renderIRC() {
    if (!els.ircList) return;
    els.ircList.textContent = state.irc.length ? state.irc.map((s, i) => `${i + 1}. ${s}`).join("\n") : "(empty)";
  }

  function renderVars() {
    if (!els.varList) return;
    const entries = Object.entries(state.variables);
    els.varList.innerHTML = entries.length
      ? entries.map(([k, v]) => `<span class="kv mono">${escapeHtml(k)} = ${escapeHtml(String(v))}</span>`).join("")
      : "";
  }

  function renderMemories() {
    if (!els.memoryList) return;
    if (!state.memories.length) {
      els.memoryList.innerHTML = '<div class="small">No memory items yet.</div>';
      return;
    }
    els.memoryList.innerHTML = state.memories
      .map(
        (m, i) => `
      <div style="margin-bottom:10px">
        <div><span class="pill">#${i}</span> <strong>${escapeHtml(m.summary)}</strong></div>
        <div class="small mono" style="margin-top:4px; white-space:pre-wrap">${escapeHtml(m.value)}</div>
      </div>`
      )
      .join("");
  }

  /* ========================= STORAGE INIT ========================= */
  function getStoredKeys() {
    return JSON.parse(localStorage.getItem(KEYS_STORAGE) || "[]");
  }
  function setStoredKeys(arr) {
    localStorage.setItem(KEYS_STORAGE, JSON.stringify(arr));
  }
  function getQuotaConfig() {
    const cfg = JSON.parse(localStorage.getItem(QUOTA_STORAGE) || "null");
    return {
      rpm: (cfg && +cfg.rpm) || DEFAULT_QUOTAS.rpm,
      daily: (cfg && +cfg.daily) || DEFAULT_QUOTAS.daily,
      sessionMax: (cfg && +cfg.sessionMax) || DEFAULT_QUOTAS.sessionMax
    };
  }
  function loadFromStorage() {
    const keys = getStoredKeys();
    keys.forEach((k, i) => { if (els.keyInputs[i]) els.keyInputs[i].value = k; });
    state.temperature = parseFloat((els.temp && els.temp.value) || "0.3") || 0.3;

    state.model = DEFAULT_MODEL;
    if (els.model) {
      els.model.value = DEFAULT_MODEL;
      els.model.disabled = true; // force model
    }

    state.memories = JSON.parse(localStorage.getItem(MEMS_STORAGE) || "[]");
    renderMemories();

    const g = localStorage.getItem(GOALS_STORAGE) || "";
    if (els.goals) els.goals.value = g;

    updateUsageUI();
    renderIRC();
    renderVars();
  }

  /* ========================= USAGE & QUOTA ========================= */
  function initKeyUsage(key) {
    const kh = hashKey(key);
    const u = state.usage.perKey[kh];
    const today = toISODate(now());
    if (!u || u.day !== today) {
      state.usage.perKey[kh] = {
        day: today,
        dailyRequests: 0,
        minuteWindowStart: now(),
        minuteCount: 0,
        totalRequests: (u && u.totalRequests) || 0,
        inChars: (u && u.inChars) || 0,
        outChars: (u && u.outChars) || 0
      };
    }
  }

  function checkAndConsumeQuota(key) {
    const quota = getQuotaConfig();
    if (state.usage.session.requests >= quota.sessionMax) {
      throw new Error("Session request limit reached.");
    }
    initKeyUsage(key);
    const kh = hashKey(key);
    const u = state.usage.perKey[kh];

    // Daily
    if (u.dailyRequests >= quota.daily) {
      throw new Error(`Daily quota reached for key ${kh}.`);
    }

    // RPM: sliding window (simple 60-sec window)
    const nowMs = now();
    if (nowMs - u.minuteWindowStart >= 60_000) {
      u.minuteWindowStart = nowMs;
      u.minuteCount = 0;
    }
    if (u.minuteCount >= quota.rpm) {
      throw new Error(`Per-minute quota reached for key ${kh}.`);
    }

    // consume
    u.minuteCount++;
    u.dailyRequests++;
    u.totalRequests++;
    state.usage.session.requests++;
    updateUsageUI();
  }

  function addInChars(key, n) {
    const kh = hashKey(key);
    initKeyUsage(key);
    state.usage.perKey[kh].inChars += n;
    state.usage.session.inChars += n;
    updateUsageUI();
  }
  function addOutChars(key, n) {
    const kh = hashKey(key);
    initKeyUsage(key);
    state.usage.perKey[kh].outChars += n;
    state.usage.session.outChars += n;
    updateUsageUI();
  }

  /* ========================= KEY MANAGEMENT ========================= */
  function getActiveKey() {
    const keys = getStoredKeys();
    if (!keys.length) throw new Error("No API key found. Save up to five keys.");
    let i = 0;
    while (i < keys.length) {
      const idx = state.keyIndex % keys.length;
      const k = keys[idx];
      const circuit = state.circuit[k];
      if (!circuit || circuit.openUntil <= now()) {
        return k;
      }
      // this key is in open state; rotate
      state.keyIndex++;
      i++;
    }
    throw new Error("All keys are temporarily paused by circuit breaker.");
  }
  function rotateKey(reason) {
    state.keyIndex++;
    logTool("system", `Rotating key${reason ? `: ${reason}` : ""}`);
  }
  function openCircuitFor(key, ms) {
    state.circuit[key] = { openUntil: now() + ms };
    logTool("system", `Circuit opened for current key for ${Math.round(ms / 1000)}s`);
  }

  /* ========================= JS EXECUTION (in-page) ========================= */
  async function runUserJS(src) {
    if (els.jsLog) els.jsLog.textContent = "";
    const originalLog = console.log;
    let logs = [];
    console.log = (...args) => {
      logs.push(args.map((a) => asDisplay(a)).join(" "));
      originalLog(...args);
    };
    try {
      const fn = new Function(`return (async ()=>{ ${src}\n })()`);
      const result = await fn();
      console.log = originalLog;
      if (els.jsLog) {
        els.jsLog.textContent =
          logs.map((l) => "• " + l).join("\n") + (result !== undefined ? `\n\nreturn → ${asDisplay(result)}` : "");
      }
      logTool("run_js", `Executed (${src.length} chars)`);
      return { logs, result };
    } catch (err) {
      console.log = originalLog;
      if (els.jsLog) {
        els.jsLog.textContent =
          (logs.length ? logs.map((l) => "• " + l).join("\n") + "\n\n" : "") + "ERROR → " + String(err && err.stack || err);
      }
      logTool("run_js", `Error: ${String(err)}`);
      return { logs, error: String(err) };
    }
  }

  function renderCanvas(html) {
    if (els.canvas) {
      els.canvas.innerHTML = html;
      logTool("render_html", "Updated canvas");
    }
  }

  /* ========================= TOOLS DECLARATIONS ========================= */
  const functionDeclarations = [
    {
      name: "fetch_memory",
      description: "Fetch a detailed memory by index from provided memory summaries.",
      parameters: { type: "OBJECT", properties: { index: { type: "INTEGER" } }, required: ["index"] }
    },
    {
      name: "list_memories",
      description: "List available memory summaries with indices.",
      parameters: { type: "OBJECT", properties: {} }
    },
    {
      name: "irc_add",
      description: "Append one step to the Immediate Reasoning Chain for the current reply.",
      parameters: { type: "OBJECT", properties: { step: { type: "STRING" } }, required: ["step"] }
    },
    {
      name: "run_js",
      description: "Execute JavaScript in the browser. Use for network fetch, compute, parsing. Return logs and result.",
      parameters: { type: "OBJECT", properties: { code: { type: "STRING" } }, required: ["code"] }
    },
    {
      name: "render_html",
      description: "Render HTML into the canvas region for previews or interactive reasoning.",
      parameters: { type: "OBJECT", properties: { html: { type: "STRING" } }, required: ["html"] }
    },
    {
      name: "set_var",
      description: "Set a named variable for later injection into the final answer using {{var:NAME}}.",
      parameters: { type: "OBJECT", properties: { name: { type: "STRING" }, value: { type: "STRING" } }, required: ["name", "value"] }
    },
    {
      name: "get_var",
      description: "Get a named variable value previously set.",
      parameters: { type: "OBJECT", properties: { name: { type: "STRING" } }, required: ["name"] }
    },
    {
      name: "list_tools",
      description: "Return a concise list of available tools and when to use them.",
      parameters: { type: "OBJECT", properties: {} }
    }
  ];

  /* ========================= SYSTEM INSTRUCTION ========================= */
  function buildSystemInstruction() {
    const memorySummaries = state.memories.map((m, i) => `#${i}: ${m.summary}`).join("\n") || "(none)";
    const ircSoFar = state.irc.length ? state.irc.map((s, i) => `${i + 1}. ${s}`).join("\n") : "(empty)";
    const goals = (els.goals && els.goals.value.trim()) || "(none)";

    return [
      "You are a helpful model with access to an External Tools system. Do not reveal chain-of-thought.",
      "Work in iterations: plan → (optionally call tools) → draft → verify against goals → final. Keep planning brief via irc_add.",
      "",
      "DATA STRUCTURES:",
      "• Memory: You receive only memory summaries; call list_memories then fetch_memory(index) for details when needed.",
      "• Immediate Reasoning Chain (IRC): Steps for the current reply only. Append short steps with irc_add(step).",
      "• Goals: Global constraints to satisfy in the final answer. A verification pass checks your draft with Goals + IRC.",
      "",
      "TOOLS:",
      "• run_js({code}): Executes real JS in the user's browser (with network fetch).",
      "• render_html({html}): Renders HTML into a visible canvas.",
      "• set_var/get_var: Manage variables for final answer placeholders {{var:NAME}}.",
      "• list_memories/fetch_memory, list_tools.",
      "",
      "TOOL INTENT POLICY (robust identification):",
      "- Use run_js for any web request, data transformation, heavy compute, or parsing.",
      "- Use render_html to preview or iterate on visual/HTML outputs.",
      "- Use fetch_memory only when a summary indicates relevant details are needed.",
      "- Always keep IRC concise and add steps via irc_add when planning or verifying.",
      "",
      "OUTPUT PROTOCOL:",
      "• Do not output chain-of-thought. Provide clear, direct answers.",
      "• If you want to include JS-produced content in the final answer, store it into a variable via set_var and reference it via {{var:NAME}}. The renderer will replace placeholders.",
      "",
      "SUPPLIED CONTEXT:",
      `• Memory Summaries:\n${memorySummaries}`,
      `• Immediate Reasoning Chain:\n${ircSoFar}`,
      `• Goals:\n${goals}`
    ].join("\n");
  }

  /* ========================= GEMINI CALLS: STREAMING + RETRIES ========================= */
  function buildPayload(contents) {
    return {
      systemInstruction: { role: "user", parts: [{ text: buildSystemInstruction() }] },
      tools: [{ functionDeclarations }],
      contents,
      generationConfig: {
        temperature: (els.temp && Number(els.temp.value || "0.3")) || state.temperature,
        candidateCount: 1
      },
      safetySettings: []
    };
  }

  async function* readSSE(stream, currentKey) {
    const reader = stream.getReader();
    const decoder = new TextDecoder("utf-8");
    let buf = "";
    while (true) {
      const { value, done } = await reader.read();
      if (done) break;
      const textChunk = decoder.decode(value, { stream: true });
      addOutChars(currentKey, textChunk.length);
      buf += textChunk;
      let idx;
      while ((idx = buf.indexOf("\n\n")) >= 0) {
        const chunk = buf.slice(0, idx).trim();
        buf = buf.slice(idx + 2);
        if (!chunk) continue;
        const lines = chunk.split("\n").map((s) => s.trim());
        for (const l of lines) {
          if (!l.startsWith("data:")) continue;
          const payload = l.slice(5).trim();
          if (!payload || payload === "[DONE]") continue;
          try {
            yield JSON.parse(payload);
          } catch {
            // ignore parse errors
          }
        }
      }
    }
  }

  function extractParts(evt) {
    const out = { textDelta: "", toolCalls: [] };
    const cands = evt.candidates || [];
    for (const c of cands) {
      const parts = (c.content && c.content.parts) || [];
      for (const p of parts) {
        if (p.text) out.textDelta += p.text;
        if (p.functionCall) out.toolCalls.push(p.functionCall);
      }
    }
    return out;
  }

  async function sseRequestWithRetry(payload, kind) {
    let attempts = 0;
    while (attempts < MAX_RETRY_PER_CALL) {
      const key = getActiveKey();
      try {
        checkAndConsumeQuota(key);
      } catch (quotaErr) {
        // If quota exceeded on this key, rotate to next and try again.
        rotateKey(String(quotaErr));
        attempts++;
        continue;
      }

      const url = STREAM_ENDPOINT(state.model, key);
      const bodyStr = JSON.stringify(payload);
      addInChars(key, bodyStr.length);

      const aborter = new AbortController();
      state.inFlight = { aborter, kind };
      let res;
      try {
        res = await fetch(url, {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: bodyStr,
          signal: aborter.signal
        });
      } catch (err) {
        // Network failure: open circuit briefly and retry with backoff
        openCircuitFor(key, CIRCUIT_BREAK_MS);
        rotateKey("network error");
        attempts++;
        await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter());
        continue;
      } finally {
        state.inFlight = null;
      }

      if (res.status === 429 || res.status === 503) {
        openCircuitFor(key, CIRCUIT_BREAK_MS);
        rotateKey(`HTTP ${res.status}`);
        attempts++;
        await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter());
        continue;
      }
      if (res.status === 401 || res.status === 403) {
        // Invalid or unauthorized key: open circuit longer for this key
        openCircuitFor(key, 5 * CIRCUIT_BREAK_MS);
        rotateKey(`HTTP ${res.status}`);
        attempts++;
        continue;
      }
      if (!res.ok) {
        const text = await safeText(res);
        logTool("system", `Gemini error ${res.status}: ${text.slice(0, 200)}`);
        // For non-retryable 4xx other than 401/403/429, bubble up
        if (res.status >= 400 && res.status < 500 && res.status !== 429) {
          throw new Error(`Gemini error ${res.status}: ${text}`);
        }
        // Retryable?
        attempts++;
        await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter());
        continue;
      }

      return { stream: res.body, key }; // success
    }
    throw new Error("All retries exhausted.");
  }

  async function safeText(res) {
    try { return await res.text(); } catch { return "(no body)"; }
  }

  /* ========================= TOOL EXECUTION ========================= */
  function toolResponseContent(name, response) {
    return {
      role: "tool",
      parts: [
        {
          functionResponse: {
            name,
            response: typeof response === "object" && response !== null ? response : { data: String(response) }
          }
        }
      ]
    };
  }

  async function execTool(call) {
    const { name, args } = call;
    try {
      switch (name) {
        case "list_tools": {
          const tools = [
            { name: "fetch_memory(index)", use: "Retrieve detailed memory by index" },
            { name: "list_memories()", use: "List memory summaries and indices" },
            { name: "irc_add(step)", use: "Append one planning/validation step" },
            { name: "run_js(code)", use: "Execute JS in browser; can fetch the internet" },
            { name: "render_html(html)", use: "Render HTML in canvas" },
            { name: "set_var(name,value) / get_var(name)", use: "Manage variables for {{var:NAME}} replacement" }
          ];
          logTool("tool", "list_tools called");
          return toolResponseContent("list_tools", { tools });
        }
        case "list_memories": {
          const summaries = state.memories.map((m, i) => ({ index: i, summary: m.summary }));
          logTool("tool", "list_memories called");
          return toolResponseContent("list_memories", { summaries });
        }
        case "fetch_memory": {
          const i = Number(args?.index);
          if (Number.isNaN(i) || i < 0 || i >= state.memories.length) throw new Error("Invalid memory index");
          logTool("tool", `fetch_memory #${i}`);
          return toolResponseContent("fetch_memory", { index: i, value: state.memories[i].value, summary: state.memories[i].summary });
        }
        case "irc_add": {
          const step = String(args?.step || "").slice(0, 500);
          if (step) state.irc.push(step);
          renderIRC();
          logTool("tool", `irc_add "${step}"`);
          return toolResponseContent("irc_add", { ok: true, length: state.irc.length });
        }
        case "run_js": {
          const code = String(args?.code || "");
          logTool("tool", `run_js (${code.length} chars)`);
          const out = await runUserJS(code);
          if (out && out.result && typeof out.result === "object") {
            Object.entries(out.result).forEach(([k, v]) => (state.variables[k] = v));
            renderVars();
          }
          return toolResponseContent("run_js", out);
        }
        case "render_html": {
          const html = String(args?.html || "");
          renderCanvas(html);
          return toolResponseContent("render_html", { ok: true });
        }
        case "set_var": {
          const name = String(args?.name || "").trim();
          const value = String(args?.value ?? "");
          if (!name) throw new Error("name required");
          state.variables[name] = value;
          renderVars();
          logTool("tool", `set_var ${name}`);
          return toolResponseContent("set_var", { ok: true });
        }
        case "get_var": {
          const name = String(args?.name || "").trim();
          const value = state.variables[name];
          logTool("tool", `get_var ${name}`);
          return toolResponseContent("get_var", { name, value: value ?? null });
        }
        default:
          logTool("tool", `Unknown tool: ${name}`);
          return toolResponseContent(name, { error: `Unknown tool ${name}` });
      }
    } catch (err) {
      logTool("tool", `Error in ${name}: ${String(err)}`);
      return toolResponseContent(name, { error: String(err) });
    }
  }

  /* ========================= CHAT ORCHESTRATION ========================= */
  function buildUserContent(text) {
    return { role: "user", parts: [{ text }] };
  }
  function buildSystem(text) {
    return { role: "user", parts: [{ text }] };
  }

  async function toolIteration(conversation, streamSink) {
    let iteration = 0;
    while (iteration++ < MAX_TOOL_ITERATIONS) {
      const payload = buildPayload(conversation);
      let draft = "";
      const { stream, key } = await sseRequestWithRetry(payload, "draft");
      for await (const evt of readSSE(stream, key)) {
        const { textDelta, toolCalls } = extractParts(evt);
        if (textDelta) {
          draft += textDelta;
          streamSink(textDelta);
        }
        if (toolCalls && toolCalls.length) {
          // Execute tools, then continue with updated conversation
          for (const call of toolCalls) {
            logTool("intention", `Tool call requested: ${call.name}`);
            const toolContent = await execTool(call);
            conversation.push(toolContent);
          }
        }
      }
      // If we got tool calls, the conversation was extended; loop to let model consume tool responses
      if (conversation.length && conversation[conversation.length - 1].role === "tool") {
        continue;
      }
      // No outstanding tool calls; return final draft for this phase
      return { draft, conversation };
    }
    throw new Error("Maximum tool iterations exceeded.");
  }

  async function verifyPass() {
    const verifyPrompt = [
      "VERIFY AGAINST GOALS.",
      "Given the previous draft answer, STRICTLY check it against the Goals and the IRC (steps).",
      "If the draft fully satisfies all goals, return a concise, professional FINAL answer.",
      "Otherwise, revise it to satisfy all goals and return only the revised FINAL answer.",
      "Do NOT include analysis. Do NOT mention verification.",
      "If the draft used variables like {{var:NAME}}, keep those placeholders intact."
    ].join(" ");
    const verifyConversation = [
      ...state.history,
      { role: "user", parts: [{ text: verifyPrompt }] }
    ];
    const payload = buildPayload(verifyConversation);
    const { stream, key } = await sseRequestWithRetry(payload, "verify");
    let verified = "";
    for await (const evt of readSSE(stream, key)) {
      const { textDelta } = extractParts(evt);
      if (textDelta) verified += textDelta;
    }
    return verified;
  }

  async function runChatTurn(userText) {
    // Push user
    const userContent = buildUserContent(userText);
    state.history.push(userContent);

    // DRAFT PHASE (with tools)
    const modelMsg = addMsg("model", "");
    const conv = [...state.history, buildSystem("Use tools as needed, then provide a draft.")];
    let lastText = "";
    const { draft, conversation } = await toolIteration(conv, (delta) => {
      lastText += delta;
      modelMsg.set(lastText);
    });

    state.history.push({ role: "model", parts: [{ text: draft || "" }] });

    // VERIFICATION PHASE
    const verifyMsg = addMsg("model", "");
    const verified = await verifyPass();

    // VARIABLE INJECTION
    const injected = verified.replace(/\{\{var:([\w\-]+)\}\}/g, (_, name) => String(state.variables[name] ?? ""));
    verifyMsg.set(injected);

    // Save final
    state.history.push({ role: "model", parts: [{ text: injected }] });
  }

  /* ========================= EVENT BINDINGS ========================= */
  function bindUI() {
    if (els.saveKeys) {
      els.saveKeys.onclick = () => {
        const keys = els.keyInputs.map((i) => i.value.trim()).filter(Boolean);
        setStoredKeys(keys);
        logTool("system", `Saved API keys (${keys.length})`);
      };
    }

    if (els.saveGoals) {
      els.saveGoals.onclick = () => {
        const g = (els.goals && els.goals.value.trim()) || "";
        localStorage.setItem(GOALS_STORAGE, g);
        logTool("system", "Saved goals");
      };
    }
    if (els.clearGoals) {
      els.clearGoals.onclick = () => {
        localStorage.removeItem(GOALS_STORAGE);
        if (els.goals) els.goals.value = "";
        logTool("system", "Cleared goals");
      };
    }

    if (els.addMemory) {
      els.addMemory.onclick = () => {
        const s = (els.memSummary && els.memSummary.value.trim()) || "";
        const v = (els.memValue && els.memValue.value.trim()) || "";
        if (!s || !v) return;
        state.memories.push({ summary: s, value: v, ts: now() });
        if (els.memSummary) els.memSummary.value = "";
        if (els.memValue) els.memValue.value = "";
        localStorage.setItem(MEMS_STORAGE, JSON.stringify(state.memories));
        renderMemories();
      };
    }
    if (els.clearMemory) {
      els.clearMemory.onclick = () => {
        state.memories = [];
        localStorage.removeItem(MEMS_STORAGE);
        renderMemories();
        logTool("system", "Cleared memory store");
      };
    }

    if (els.runJS) {
      els.runJS.onclick = async () => {
        const code = (els.jsCode && els.jsCode.value) || "";
        const out = await runUserJS(code);
        if (out && out.result && typeof out.result === "object") {
          Object.entries(out.result).forEach(([k, v]) => (state.variables[k] = v));
          renderVars();
        }
      };
    }
    if (els.clearJS) {
      els.clearJS.onclick = () => {
        if (els.jsCode) els.jsCode.value = "";
        if (els.jsLog) els.jsLog.textContent = "";
      };
    }

    if (els.renderHTML) {
      els.renderHTML.onclick = () => {
        const html = (els.htmlCanvasInput && els.htmlCanvasInput.value) || "";
        renderCanvas(html);
      };
    }
    if (els.clearCanvas) {
      els.clearCanvas.onclick = () => renderCanvas("");
    }

    // Send / Cancel behavior with AbortController
    let sending = false;
    const setSending = (on) => {
      sending = on;
      if (els.send) {
        els.send.textContent = on ? "Cancel" : "Send";
      }
    };

    if (els.send) {
      els.send.onclick = async () => {
        if (sending && state.inFlight && state.inFlight.aborter) {
          state.inFlight.aborter.abort();
          logTool("system", "Aborted current request");
          setSending(false);
          return;
        }
        const text = (els.prompt && els.prompt.value.trim()) || "";
        if (!text) return;
        const yourMsg = addMsg("user", text);
        if (els.prompt) els.prompt.value = "";
        try {
          setSending(true);
          await runChatTurn(text);
        } catch (err) {
          addMsg("model", "Error: " + String((err && err.message) || err));
        } finally {
          setSending(false);
        }
      };
    }

    // New thread
    if (els.newThread) {
      els.newThread.onclick = () => {
        state.history = [];
        state.irc = [];
        renderIRC();
        if (els.chat) els.chat.innerHTML = "";
        logTool("system", "Started a new thread");
      };
    }

    // Temperature sync (optional)
    if (els.temp) {
      els.temp.onchange = () => {
        const t = parseFloat(els.temp.value);
        state.temperature = isFinite(t) ? clamp(t, 0, 1) : 0.3;
      };
    }

    // ESC to cancel
    window.addEventListener("keydown", (e) => {
      if (e.key === "Escape" && state.inFlight && state.inFlight.aborter) {
        state.inFlight.aborter.abort();
        logTool("system", "Aborted current request (Esc)");
      }
    });
  }

  /* ========================= BOOT ========================= */
  window.addEventListener("load", () => {
    // Force model
    if (els.model) {
      els.model.value = DEFAULT_MODEL;
      els.model.disabled = true;
    }
    loadFromStorage();
    bindUI();
    logTool("system", `Ready. Model: ${DEFAULT_MODEL}`);
  });
})();

Domanda

Error: Gemini error 404: {
"error": {
"code": 404,
"message": "models/gemini-2.5-flash-latest is not found for API version v1beta, or is not supported for generateContent. Call ListModels to see the list of available models and their supported methods.",
"status": "NOT_FOUND"
}
}

get the model list and make it update the list automatically. the current options must only be displayed if the list is not fetched from the internet only. Also, show rate limits for each API key entered. Output that js snippet. Make sure it will be independent or tell me explicitly which code to edit and where to find that code so that i dont mess up my copy pasting.

Pensiero

Evaluating API handling

I’m considering how to fetch a list of models using Google's Generative Language API. The endpoint is probably "generativelanguage.googleapis.com/v1beta/models" as of 2025. However, I’m unsure if Google returns rate limit headers, though we can track usage via budgets we’ve previously set. I’ll need a solution to reflect this in the code.

Incorporating features

I need to display rate limits, so I’ll use configurable quotas and track usage. We can show “rate limit headers” only if available. Also, the model list should be fetched from the internet when possible, but if it fails, fallback options will appear. I’ll implement a new function to fetch model lists and ensure the UI updates accordingly.

Handling model fetching and fallback

I’ll implement a robust solution with retries and rotating API keys. When fetching the model list, I’ll filter for models supporting “generateContent” or “streamGenerateContent.” On load or when keys change, I’ll update the model selection, picking the best available one but still allowing user selection. I'll also ensure SSE endpoints handle streaming models correctly.

Resolving generation method and rate limits

I’m going to check for the generation method support in the API documentation, specifically for "generateContent" and "streamGenerateContent." If certain models aren't available, we’ll list the available ones and let the user choose. I'll also implement checking for rate limits by sending a no-op request and reading the headers.

Building a robust model-fetching and rate-limiting UI

The plan is to update the UI by adding a table displaying key validity, quotas, and current usage. Also, dynamic updates will happen for the model list, showing fallback options only when the list fetch fails. Quota information for each key will be displayed—including the limits if available. We'll keep things simple yet functional.

Thought for 1m 20s

Risposta

javascript
/* 
  DROP-IN REPLACEMENT for your previous <script>…</script> block.
  Paste this entire snippet inside your page’s <script> tags, replacing the old code.

  What’s new vs prior version:
  - Auto-fetches the live model list via ListModels and updates the <select id="model">.
    • If fetching fails (no internet/invalid keys), falls back to built-ins.
    • Chooses the correct streaming path per model (streamGenerateContent vs generateContent).
  - Shows per-key status & rate-limit view (validity + local quotas + live usage).
  - Keeps five-key rotation, circuit breakers, SSE streaming, JS execution, canvas rendering,
    Memory/IRC/Goals data-structures, verification pass, variable injection, cancel/abort.

  NOTE: Gemini's public API typically does not return explicit X-RateLimit headers.
  We display (a) whether the key is valid/usable, and (b) configurable local quotas & live usage.
*/

(() => {
  "use strict";

  /* ========================= DOM HOOKS (graceful if absent) ========================= */
  const q = (id) => document.getElementById(id);
  const els = {
    aside: document.querySelector('aside'),
    model: q('model'),
    keyInputs: [1, 2, 3, 4, 5].map((n) => q('key' + n)).filter(Boolean),
    saveKeys: q('saveKeys'),
    temp: q('temp'),
    send: q('send'),
    newThread: q('newThread'),
    chat: q('chat'),
    prompt: q('prompt'),
    goals: q('goals'),
    saveGoals: q('saveGoals'),
    clearGoals: q('clearGoals'),
    memSummary: q('memSummary'),
    memValue: q('memValue'),
    addMemory: q('addMemory'),
    clearMemory: q('clearMemory'),
    memoryList: q('memoryList'),
    runJS: q('runJS'),
    clearJS: q('clearJS'),
    jsCode: q('jsCode'),
    jsLog: q('jsLog'),
    renderHTML: q('renderHTML'),
    clearCanvas: q('clearCanvas'),
    htmlCanvasInput: q('htmlCanvasInput'),
    canvas: q('canvas'),
    toolLog: q('toolLog'),
    varList: q('varList'),
    ircList: q('ircList'),
  };

  /* ========================= CONSTANTS ========================= */
  const GEMINI_BASE = "https://generativelanguage.googleapis.com/v1beta";
  const MODEL_LIST_PATH = () => `${GEMINI_BASE}/models`;
  const STREAM_ENDPOINT = (model, key, method) =>
    `${GEMINI_BASE}/models/${encodeURIComponent(model)}:${method}?alt=sse&key=${encodeURIComponent(key)}`;

  // Fallback options ONLY if live fetch fails
  const FALLBACK_MODELS = [
    "gemini-1.5-flash-latest",
    "gemini-1.5-pro-latest"
  ];

  // Quotas: local budgets; tune with localStorage key "gemini_quota_config"
  const DEFAULT_QUOTAS = {
    rpm: 60,         // requests per minute per key
    daily: 10000,    // requests per calendar day per key
    sessionMax: 5000 // per page-load, across all keys
  };

  // Retry/backoff
  const MAX_TOOL_ITERATIONS = 8;
  const MAX_RETRY_PER_CALL = 3;
  const BASE_BACKOFF_MS = 600;
  const JITTER_MS = 400;
  const CIRCUIT_BREAK_MS = 60_000;

  // Storage keys
  const KEYS_STORAGE = "gemini_keys";
  const GOALS_STORAGE = "goals";
  const MEMS_STORAGE = "memories";
  const QUOTA_STORAGE = "gemini_quota_config";
  const MODELS_CACHE_STORAGE = "gemini_models_cache"; // optional cache

  /* ========================= STATE ========================= */
  const state = {
    // conversation
    history: [],
    irc: [],
    memories: [],
    variables: {},

    // model & streaming method
    model: null,
    modelsByName: {},  // name -> meta
    streamingMethodByModel: {}, // name -> 'streamGenerateContent' | 'generateContent'

    // generation
    temperature: 0.3,

    // keys + usage
    keyIndex: 0,
    circuit: {}, // key -> { openUntil }
    usage: {
      session: { requests: 0, inChars: 0, outChars: 0, startedAt: Date.now() },
      perKey: {} // keyHash -> { day, dailyRequests, minuteWindowStart, minuteCount, totalRequests, inChars, outChars }
    },
    keyStatus: {}, // keyHash -> { lastChecked, ok, http, msg }

    // control
    inFlight: null
  };

  /* ========================= UTILITIES ========================= */
  const now = () => Date.now();
  const toISODate = (ms) => new Date(ms).toISOString().slice(0, 10);
  const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
  const jitter = () => Math.floor(Math.random() * JITTER_MS);
  const clamp = (n, lo, hi) => Math.max(lo, Math.min(hi, n));
  const safeJSON = (s) => { try { return JSON.parse(s); } catch { return null; } };

  function el(tag, cls) { const e = document.createElement(tag); if (cls) e.className = cls; return e; }
  function escapeHtml(s) {
    return String(s).replace(/[&<>"']/g, (m) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#039;" }[m]));
  }
  function asDisplay(v) { try { return typeof v === "string" ? v : JSON.stringify(v, null, 2); } catch { return String(v); } }

  function hashKey(k) { let h = 0; for (let i = 0; i < k.length; i++) h = (h * 31 + k.charCodeAt(i)) | 0; return "k" + (h >>> 0).toString(16); }

  /* ========================= LOGGING ========================= */
  function logTool(who, text) {
    const line = `[${new Date().toLocaleTimeString()}] ${who.toUpperCase()}: ${text}\n`;
    if (els.toolLog) { els.toolLog.textContent += line; els.toolLog.scrollTop = els.toolLog.scrollHeight; }
    else { console.log(line.trim()); }
  }

  /* ========================= PANELS (Usage + Rate Limits) ========================= */
  function ensureUsagePanel() {
    if (!els.aside) return null;
    let panel = q('usagePanel');
    if (panel) return panel;
    panel = el('div', 'section');
    panel.id = 'usagePanel';
    panel.innerHTML = `
      <h2>Usage</h2>
      <div id="usageSummary" class="small mono"></div>
      <div id="usageKeys" class="small mono" style="margin-top:6px"></div>
      <div class="divider"></div>
      <h2>Key Status & Rate Limits</h2>
      <div id="rateLimits" class="small mono"></div>
    `;
    els.aside.appendChild(panel);
    return panel;
  }

  function updateUsageUI() {
    ensureUsagePanel();
    const session = state.usage.session;
    const sumEl = q('usageSummary');
    const keysEl = q('usageKeys');
    const rateEl = q('rateLimits');
    const quota = getQuotaConfig();
    if (sumEl) sumEl.textContent =
      `Session requests: ${session.requests}/${quota.sessionMax} | In chars: ${session.inChars} | Out chars: ${session.outChars}`;
    if (keysEl) {
      const lines = [];
      for (const [kh, v] of Object.entries(state.usage.perKey)) {
        lines.push(`${kh}: day ${v.day} | daily ${v.dailyRequests}/${quota.daily} | minute ${v.minuteCount}/${quota.rpm} | total ${v.totalRequests}`);
      }
      keysEl.textContent = lines.join('\n') || '(no key usage yet)';
    }
    if (rateEl) {
      const keys = getStoredKeys();
      if (!keys.length) { rateEl.textContent = '(enter and save API keys to view status)'; return; }
      const rows = [];
      for (const k of keys) {
        const kh = hashKey(k);
        const st = state.keyStatus[kh] || {};
        const u = state.usage.perKey[kh];
        const validity = st.ok ? 'OK' : (st.http ? `HTTP ${st.http}` : 'Unknown');
        const msg = st.msg ? ` — ${st.msg}` : '';
        rows.push(`${kh}: ${validity}${msg}`);
        if (u) rows.push(`  usage → minute ${u.minuteCount}/${getQuotaConfig().rpm}, daily ${u.dailyRequests}/${getQuotaConfig().daily}, total ${u.totalRequests}`);
      }
      rateEl.textContent = rows.join('\n');
    }
  }

  /* ========================= UI HELPERS ========================= */
  function addMsg(role, content) {
    if (!els.chat) return { pre: { textContent: '' }, set: () => {} };
    const wrap = el("div", "msg " + role);
    const meta = el("div", "meta"); meta.textContent = role === "user" ? "You" : "Model";
    const pre = el("div"); pre.className = "mono"; pre.style.whiteSpace = "pre-wrap"; pre.textContent = content || "";
    wrap.appendChild(meta); wrap.appendChild(pre); els.chat.appendChild(wrap); els.chat.scrollTop = els.chat.scrollHeight;
    return { pre, set: (t) => { pre.textContent = t; els.chat.scrollTop = els.chat.scrollHeight; } };
  }
  function renderIRC() { if (els.ircList) els.ircList.textContent = state.irc.length ? state.irc.map((s, i) => `${i + 1}. ${s}`).join("\n") : "(empty)"; }
  function renderVars() {
    if (!els.varList) return;
    const entries = Object.entries(state.variables);
    els.varList.innerHTML = entries.length ? entries.map(([k, v]) => `<span class="kv mono">${escapeHtml(k)} = ${escapeHtml(String(v))}</span>`).join("") : "";
  }
  function renderMemories() {
    if (!els.memoryList) return;
    if (!state.memories.length) { els.memoryList.innerHTML = '<div class="small">No memory items yet.</div>'; return; }
    els.memoryList.innerHTML = state.memories.map((m, i) => `
      <div style="margin-bottom:10px">
        <div><span class="pill">#${i}</span> <strong>${escapeHtml(m.summary)}</strong></div>
        <div class="small mono" style="margin-top:4px; white-space:pre-wrap">${escapeHtml(m.value)}</div>
      </div>`).join("");
  }

  /* ========================= STORAGE ========================= */
  function getStoredKeys() { return JSON.parse(localStorage.getItem(KEYS_STORAGE) || "[]"); }
  function setStoredKeys(arr) { localStorage.setItem(KEYS_STORAGE, JSON.stringify(arr)); }
  function getQuotaConfig() {
    const cfg = JSON.parse(localStorage.getItem(QUOTA_STORAGE) || "null");
    return {
      rpm: (cfg && +cfg.rpm) || DEFAULT_QUOTAS.rpm,
      daily: (cfg && +cfg.daily) || DEFAULT_QUOTAS.daily,
      sessionMax: (cfg && +cfg.sessionMax) || DEFAULT_QUOTAS.sessionMax
    };
  }

  /* ========================= USAGE & QUOTA ========================= */
  function initKeyUsage(key) {
    const kh = hashKey(key);
    const today = toISODate(now());
    const u = state.usage.perKey[kh];
    if (!u || u.day !== today) {
      state.usage.perKey[kh] = {
        day: today, dailyRequests: 0,
        minuteWindowStart: now(), minuteCount: 0,
        totalRequests: (u && u.totalRequests) || 0,
        inChars: (u && u.inChars) || 0, outChars: (u && u.outChars) || 0
      };
    }
  }
  function addInChars(key, n) {
    const kh = hashKey(key); initKeyUsage(key);
    state.usage.perKey[kh].inChars += n; state.usage.session.inChars += n; updateUsageUI();
  }
  function addOutChars(key, n) {
    const kh = hashKey(key); initKeyUsage(key);
    state.usage.perKey[kh].outChars += n; state.usage.session.outChars += n; updateUsageUI();
  }
  function checkAndConsumeQuota(key) {
    const quota = getQuotaConfig();
    if (state.usage.session.requests >= quota.sessionMax) throw new Error("Session request limit reached.");
    initKeyUsage(key);
    const kh = hashKey(key);
    const u = state.usage.perKey[kh];

    // daily
    if (u.dailyRequests >= quota.daily) throw new Error(`Daily quota reached for key ${kh}.`);

    // rpm
    const nowMs = now();
    if (nowMs - u.minuteWindowStart >= 60_000) { u.minuteWindowStart = nowMs; u.minuteCount = 0; }
    if (u.minuteCount >= quota.rpm) throw new Error(`Per-minute quota reached for key ${kh}.`);

    // consume
    u.minuteCount++; u.dailyRequests++; u.totalRequests++; state.usage.session.requests++; updateUsageUI();
  }

  /* ========================= KEY MANAGEMENT ========================= */
  function getActiveKey() {
    const keys = getStoredKeys();
    if (!keys.length) throw new Error("No API key found. Save up to five keys.");
    let i = 0;
    while (i < keys.length) {
      const idx = state.keyIndex % keys.length;
      const k = keys[idx];
      const circuit = state.circuit[k];
      if (!circuit || circuit.openUntil <= now()) return k;
      state.keyIndex++; i++;
    }
    throw new Error("All keys are temporarily paused by circuit breaker.");
  }
  function rotateKey(reason) { state.keyIndex++; logTool("system", `Rotating key${reason ? `: ${reason}` : ""}`); }
  function openCircuitFor(key, ms) { state.circuit[key] = { openUntil: now() + ms }; logTool("system", `Circuit opened for current key for ${Math.round(ms / 1000)}s`); }

  /* ========================= JS EXECUTION & CANVAS ========================= */
  async function runUserJS(src) {
    if (els.jsLog) els.jsLog.textContent = "";
    const originalLog = console.log;
    let logs = [];
    console.log = (...args) => { logs.push(args.map((a) => asDisplay(a)).join(" ")); originalLog(...args); };
    try {
      const fn = new Function(`return (async ()=>{ ${src}\n })()`);
      const result = await fn();
      console.log = originalLog;
      if (els.jsLog) els.jsLog.textContent = logs.map((l) => "• " + l).join("\n") + (result !== undefined ? `\n\nreturn → ${asDisplay(result)}` : "");
      logTool("run_js", `Executed (${src.length} chars)`);
      return { logs, result };
    } catch (err) {
      console.log = originalLog;
      if (els.jsLog) els.jsLog.textContent = (logs.length ? logs.map((l) => "• " + l).join("\n") + "\n\n" : "") + "ERROR → " + String(err && err.stack || err);
      logTool("run_js", `Error: ${String(err)}`);
      return { logs, error: String(err) };
    }
  }
  function renderCanvas(html) { if (els.canvas) { els.canvas.innerHTML = html; logTool("render_html", "Updated canvas"); } }

  /* ========================= TOOLS DECLARATIONS ========================= */
  const functionDeclarations = [
    { name: "fetch_memory", description: "Fetch a detailed memory by index from provided memory summaries.", parameters: { type: "OBJECT", properties: { index: { type: "INTEGER" } }, required: ["index"] } },
    { name: "list_memories", description: "List available memory summaries with indices.", parameters: { type: "OBJECT", properties: {} } },
    { name: "irc_add", description: "Append one step to the Immediate Reasoning Chain for the current reply.", parameters: { type: "OBJECT", properties: { step: { type: "STRING" } }, required: ["step"] } },
    { name: "run_js", description: "Execute JavaScript in the browser. Use for network fetch, compute, parsing. Return logs and result.", parameters: { type: "OBJECT", properties: { code: { type: "STRING" } }, required: ["code"] } },
    { name: "render_html", description: "Render HTML into the canvas region for previews or interactive reasoning.", parameters: { type: "OBJECT", properties: { html: { type: "STRING" } }, required: ["html"] } },
    { name: "set_var", description: "Set a named variable for later injection into the final answer using {{var:NAME}}.", parameters: { type: "OBJECT", properties: { name: { type: "STRING" }, value: { type: "STRING" } }, required: ["name", "value"] } },
    { name: "get_var", description: "Get a named variable value previously set.", parameters: { type: "OBJECT", properties: { name: { type: "STRING" } }, required: ["name"] } },
    { name: "list_tools", description: "Return a concise list of available tools and when to use them.", parameters: { type: "OBJECT", properties: {} } }
  ];

  /* ========================= SYSTEM INSTRUCTION ========================= */
  function buildSystemInstruction() {
    const memorySummaries = state.memories.map((m, i) => `#${i}: ${m.summary}`).join("\n") || "(none)";
    const ircSoFar = state.irc.length ? state.irc.map((s, i) => `${i + 1}. ${s}`).join("\n") : "(empty)";
    const goals = (els.goals && els.goals.value.trim()) || "(none)";
    return [
      "You are a helpful model with access to an External Tools system. Do not reveal chain-of-thought.",
      "Work in iterations: plan → (optionally call tools) → draft → verify against goals → final. Keep planning brief via irc_add.",
      "",
      "DATA STRUCTURES:",
      "• Memory: You receive only memory summaries; call list_memories then fetch_memory(index) when needed.",
      "• Immediate Reasoning Chain (IRC): Steps for the current reply only. Append short steps with irc_add(step).",
      "• Goals: Global constraints to satisfy in the final answer. A verification pass checks your draft with Goals + IRC.",
      "",
      "TOOLS:",
      "• run_js({code}): Executes real JS in the user's browser (network fetch allowed).",
      "• render_html({html}): Renders HTML into a visible canvas.",
      "• set_var/get_var: Manage variables for final answer placeholders {{var:NAME}}.",
      "• list_memories/fetch_memory, list_tools.",
      "",
      "OUTPUT PROTOCOL:",
      "• Do not output chain-of-thought.",
      "• If you include JS-produced content in the final answer, set a variable via set_var and reference it as {{var:NAME}}.",
      "",
      "SUPPLIED CONTEXT:",
      `• Memory Summaries:\n${memorySummaries}`,
      `• Immediate Reasoning Chain:\n${ircSoFar}`,
      `• Goals:\n${goals}`
    ].join("\n");
  }

  /* ========================= GEMINI: MODEL LIST (ListModels) ========================= */
  async function fetchAllModelsWithAnyKey() {
    const keys = getStoredKeys();
    if (!keys.length) throw new Error("No API key found to fetch model list.");

    const models = [];
    let ok = false;

    for (let i = 0; i < keys.length; i++) {
      const key = keys[(state.keyIndex + i) % keys.length];
      try {
        checkAndConsumeQuota(key);
      } catch (e) {
        continue; // try next key
      }

      let pageToken = null;
      try {
        do {
          const url = new URL(MODEL_LIST_PATH());
          url.searchParams.set("key", key);
          url.searchParams.set("pageSize", "100");
          if (pageToken) url.searchParams.set("pageToken", pageToken);

          const res = await fetch(url.toString(), { method: "GET" });
          const kh = hashKey(key);
          state.keyStatus[kh] = { lastChecked: now(), ok: res.ok, http: res.status, msg: res.ok ? "Listed models" : "Failed to list models" };

          if (!res.ok) {
            if (res.status === 401 || res.status === 403) { openCircuitFor(key, 5 * CIRCUIT_BREAK_MS); }
            if (res.status === 429 || res.status === 503) { openCircuitFor(key, CIRCUIT_BREAK_MS); }
            rotateKey(`ListModels HTTP ${res.status}`);
            break; // try next key
          }

          const txt = await res.text();
          addOutChars(key, txt.length);
          const json = safeJSON(txt) || {};
          const pageModels = Array.isArray(json.models) ? json.models : [];
          models.push(...pageModels);
          pageToken = json.nextPageToken || null;
          ok = true;
        } while (pageToken);

        if (ok) { state.keyIndex = (state.keyIndex + i) % keys.length; break; } // lock onto the working key
      } catch (err) {
        const kh = hashKey(key);
        state.keyStatus[kh] = { lastChecked: now(), ok: false, http: 0, msg: String(err) };
        openCircuitFor(key, CIRCUIT_BREAK_MS);
        continue;
      }
    }

    updateUsageUI();

    if (!ok) throw new Error("Could not fetch models with any available key.");
    return models;
  }

  function selectStreamingMethod(meta) {
    const methods = meta.supportedGenerationMethods || [];
    // Prefer explicit streaming method if advertised
    if (methods.includes("streamGenerateContent")) return "streamGenerateContent";
    // Fallback: many models stream via generateContent with alt=sse
    if (methods.includes("generateContent") || methods.includes("create")) return "generateContent";
    return null; // unsupported for our chat
  }

  function populateModelSelect(models) {
    if (!els.model) return;

    els.model.innerHTML = "";
    const usable = [];

    for (const m of models) {
      const method = selectStreamingMethod(m);
      if (!method) continue;
      usable.push({ name: m.name, method, displayName: m.displayName || m.name });
      state.modelsByName[m.name] = m;
      state.streamingMethodByModel[m.name] = method;
    }

    if (usable.length === 0) {
      // Fallback only if nothing usable came back
      for (const f of FALLBACK_MODELS) {
        const opt = el("option");
        opt.value = f; opt.textContent = f;
        els.model.appendChild(opt);
        state.streamingMethodByModel[f] = "streamGenerateContent"; // best guess
      }
      // If we previously forced a model, keep it; else choose first fallback
      state.model = state.model || FALLBACK_MODELS[0];
      els.model.value = state.model;
      logTool("system", "Using fallback model list (live fetch yielded no usable models).");
      return;
    }

    // Sort a bit: prefer "-latest", then flash/pro
    usable.sort((a, b) => {
      const la = a.name.includes("latest") ? 1 : 0;
      const lb = b.name.includes("latest") ? 1 : 0;
      if (la !== lb) return lb - la;
      const fa = a.name.includes("flash") ? 1 : 0;
      const fb = b.name.includes("flash") ? 1 : 0;
      if (fa !== fb) return fb - fa;
      const pa = a.name.includes("pro") ? 1 : 0;
      const pb = b.name.includes("pro") ? 1 : 0;
      return pb - pa;
    });

    for (const u of usable) {
      const opt = el("option");
      opt.value = u.name;
      opt.textContent = u.displayName;
      els.model.appendChild(opt);
    }

    // Choose currently selected if still present, else first usable
    if (!state.model || !state.streamingMethodByModel[state.model]) {
      state.model = usable[0].name;
    }
    els.model.value = state.model;
    logTool("system", `Model list updated (${usable.length} usable). Selected: ${state.model}`);
  }

  async function refreshModelList() {
    if (!els.model) return;
    els.model.disabled = true;
    const prev = els.model.value;
    els.model.innerHTML = "";
    const loading = el("option"); loading.value = ""; loading.textContent = "Loading models…"; els.model.appendChild(loading);

    try {
      const cached = safeJSON(localStorage.getItem(MODELS_CACHE_STORAGE));
      if (cached && Array.isArray(cached.models) && now() - (cached.cachedAt || 0) < 30 * 60 * 1000) {
        populateModelSelect(cached.models);
      } else {
        const live = await fetchAllModelsWithAnyKey();
        localStorage.setItem(MODELS_CACHE_STORAGE, JSON.stringify({ models: live, cachedAt: now() }));
        populateModelSelect(live);
      }
    } catch (e) {
      logTool("system", "Model list fetch failed. Using fallback options.");
      populateModelSelect([]); // triggers fallback list only
    } finally {
      els.model.disabled = false;
      if (prev && state.streamingMethodByModel[prev]) { els.model.value = prev; state.model = prev; }
      updateUsageUI();
    }
  }

  async function recheckKeyStatuses() {
    const keys = getStoredKeys();
    if (!keys.length) { updateUsageUI(); return; }

    for (let i = 0; i < keys.length; i++) {
      const key = keys[i];
      const url = new URL(MODEL_LIST_PATH());
      url.searchParams.set("key", key);
      url.searchParams.set("pageSize", "1");
      try {
        // We COUNT this as a request so it participates in local quotas.
        checkAndConsumeQuota(key);
        const res = await fetch(url.toString(), { method: "GET" });
        const kh = hashKey(key);
        state.keyStatus[kh] = { lastChecked: now(), ok: res.ok, http: res.status, msg: res.ok ? "OK" : "Not authorized or invalid" };
        if (res.status === 401 || res.status === 403) openCircuitFor(key, 5 * CIRCUIT_BREAK_MS);
        if (res.status === 429 || res.status === 503) openCircuitFor(key, CIRCUIT_BREAK_MS);
      } catch (err) {
        const kh = hashKey(key);
        state.keyStatus[kh] = { lastChecked: now(), ok: false, http: 0, msg: String(err) };
      }
    }
    updateUsageUI();
  }

  /* ========================= GEMINI STREAMING ========================= */
  function buildPayload(contents) {
    return {
      systemInstruction: { role: "user", parts: [{ text: buildSystemInstruction() }] },
      tools: [{ functionDeclarations }],
      contents,
      generationConfig: {
        temperature: (els.temp && Number(els.temp.value || "0.3")) || state.temperature,
        candidateCount: 1
      },
      safetySettings: []
    };
  }

  async function* readSSE(stream, currentKey) {
    const reader = stream.getReader();
    const decoder = new TextDecoder("utf-8");
    let buf = "";
    while (true) {
      const { value, done } = await reader.read();
      if (done) break;
      const textChunk = decoder.decode(value, { stream: true });
      addOutChars(currentKey, textChunk.length);
      buf += textChunk;
      let idx;
      while ((idx = buf.indexOf("\n\n")) >= 0) {
        const chunk = buf.slice(0, idx).trim();
        buf = buf.slice(idx + 2);
        if (!chunk) continue;
        const lines = chunk.split("\n").map((s) => s.trim());
        for (const l of lines) {
          if (!l.startsWith("data:")) continue;
          const payload = l.slice(5).trim();
          if (!payload || payload === "[DONE]") continue;
          const obj = safeJSON(payload);
          if (obj) yield obj;
        }
      }
    }
  }

  function extractParts(evt) {
    const out = { textDelta: "", toolCalls: [] };
    const cands = evt.candidates || [];
    for (const c of cands) {
      const parts = (c.content && c.content.parts) || [];
      for (const p of parts) {
        if (p.text) out.textDelta += p.text;
        if (p.functionCall) out.toolCalls.push(p.functionCall);
      }
    }
    return out;
  }

  async function sseRequestWithRetry(payload, kind) {
    let attempts = 0;
    while (attempts < MAX_RETRY_PER_CALL) {
      const key = getActiveKey();
      try { checkAndConsumeQuota(key); } 
      catch (quotaErr) { rotateKey(String(quotaErr)); attempts++; continue; }

      // Choose path based on selected model’s capabilities
      const modelName = state.model;
      const method = state.streamingMethodByModel[modelName] || "streamGenerateContent";
      const url = STREAM_ENDPOINT(modelName, key, method);
      const bodyStr = JSON.stringify(payload);
      addInChars(key, bodyStr.length);

      const aborter = new AbortController();
      state.inFlight = { aborter, kind };
      let res;
      try {
        res = await fetch(url, { method: "POST", headers: { "Content-Type": "application/json" }, body: bodyStr, signal: aborter.signal });
      } catch (err) {
        openCircuitFor(key, CIRCUIT_BREAK_MS);
        rotateKey("network error");
        attempts++; await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter()); continue;
      } finally {
        state.inFlight = null;
      }

      if (res.status === 429 || res.status === 503) {
        openCircuitFor(key, CIRCUIT_BREAK_MS);
        rotateKey(`HTTP ${res.status}`);
        attempts++; await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter()); continue;
      }
      if (res.status === 401 || res.status === 403) {
        openCircuitFor(key, 5 * CIRCUIT_BREAK_MS);
        rotateKey(`HTTP ${res.status}`);
        attempts++; continue;
      }
      if (!res.ok) {
        const text = await (async()=>{ try { return await res.text(); } catch { return "(no body)"; }})();
        logTool("system", `Gemini error ${res.status}: ${text.slice(0, 200)}`);
        attempts++; await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter()); continue;
      }
      return { stream: res.body, key }; // success
    }
    throw new Error("All retries exhausted.");
  }

  /* ========================= TOOLS RUNTIME ========================= */
  function toolResponseContent(name, response) {
    return { role: "tool", parts: [{ functionResponse: { name, response: typeof response === "object" && response !== null ? response : { data: String(response) } } }] };
  }

  async function execTool(call) {
    const { name, args } = call;
    try {
      switch (name) {
        case "list_tools": {
          const tools = [
            { name: "fetch_memory(index)", use: "Retrieve detailed memory by index" },
            { name: "list_memories()", use: "List memory summaries and indices" },
            { name: "irc_add(step)", use: "Append one planning/validation step" },
            { name: "run_js(code)", use: "Execute JS in browser; can fetch the internet" },
            { name: "render_html(html)", use: "Render HTML in canvas" },
            { name: "set_var(name,value) / get_var(name)", use: "Manage variables for {{var:NAME}} replacement" }
          ];
          logTool("tool", "list_tools called");
          return toolResponseContent("list_tools", { tools });
        }
        case "list_memories": {
          const summaries = state.memories.map((m, i) => ({ index: i, summary: m.summary }));
          logTool("tool", "list_memories called");
          return toolResponseContent("list_memories", { summaries });
        }
        case "fetch_memory": {
          const i = Number(args?.index);
          if (Number.isNaN(i) || i < 0 || i >= state.memories.length) throw new Error("Invalid memory index");
          logTool("tool", `fetch_memory #${i}`);
          return toolResponseContent("fetch_memory", { index: i, value: state.memories[i].value, summary: state.memories[i].summary });
        }
        case "irc_add": {
          const step = String(args?.step || "").slice(0, 500);
          if (step) state.irc.push(step);
          renderIRC();
          logTool("tool", `irc_add "${step}"`);
          return toolResponseContent("irc_add", { ok: true, length: state.irc.length });
        }
        case "run_js": {
          const code = String(args?.code || "");
          logTool("tool", `run_js (${code.length} chars)`);
          const out = await runUserJS(code);
          if (out && out.result && typeof out.result === "object") { Object.entries(out.result).forEach(([k, v]) => (state.variables[k] = v)); renderVars(); }
          return toolResponseContent("run_js", out);
        }
        case "render_html": {
          const html = String(args?.html || "");
          renderCanvas(html);
          return toolResponseContent("render_html", { ok: true });
        }
        case "set_var": {
          const name = String(args?.name || "").trim();
          const value = String(args?.value ?? "");
          if (!name) throw new Error("name required");
          state.variables[name] = value; renderVars(); logTool("tool", `set_var ${name}`);
          return toolResponseContent("set_var", { ok: true });
        }
        case "get_var": {
          const name = String(args?.name || "").trim();
          const value = state.variables[name];
          logTool("tool", `get_var ${name}`);
          return toolResponseContent("get_var", { name, value: value ?? null });
        }
        default:
          logTool("tool", `Unknown tool: ${name}`);
          return toolResponseContent(name, { error: `Unknown tool ${name}` });
      }
    } catch (err) {
      logTool("tool", `Error in ${name}: ${String(err)}`);
      return toolResponseContent(name, { error: String(err) });
    }
  }

  /* ========================= CHAT LOOP ========================= */
  function buildUserContent(text) { return { role: "user", parts: [{ text }] }; }
  function buildSystem(text) { return { role: "user", parts: [{ text }] }; }

  async function toolIteration(conversation, streamSink) {
    let iteration = 0;
    while (iteration++ < MAX_TOOL_ITERATIONS) {
      const payload = buildPayload(conversation);
      let draft = "";
      const { stream, key } = await sseRequestWithRetry(payload, "draft");
      for await (const evt of readSSE(stream, key)) {
        const { textDelta, toolCalls } = extractParts(evt);
        if (textDelta) { draft += textDelta; streamSink(textDelta); }
        if (toolCalls && toolCalls.length) {
          for (const call of toolCalls) {
            logTool("intention", `Tool call requested: ${call.name}`);
            const toolContent = await execTool(call);
            conversation.push(toolContent);
          }
        }
      }
      if (conversation.length && conversation[conversation.length - 1].role === "tool") continue;
      return { draft, conversation };
    }
    throw new Error("Maximum tool iterations exceeded.");
  }

  async function verifyPass() {
    const verifyPrompt = [
      "VERIFY AGAINST GOALS.",
      "Given the previous draft answer, STRICTLY check it against the Goals and the IRC (steps).",
      "If the draft fully satisfies all goals, return a concise, professional FINAL answer.",
      "Otherwise, revise it to satisfy all goals and return only the revised FINAL answer.",
      "Do NOT include analysis. Do NOT mention verification.",
      "If the draft used variables like {{var:NAME}}, keep those placeholders intact."
    ].join(" ");
    const verifyConversation = [...state.history, { role: "user", parts: [{ text: verifyPrompt }] }];
    const payload = buildPayload(verifyConversation);
    const { stream, key } = await sseRequestWithRetry(payload, "verify");
    let verified = "";
    for await (const evt of readSSE(stream, key)) {
      const { textDelta } = extractParts(evt);
      if (textDelta) verified += textDelta;
    }
    return verified;
  }

  async function runChatTurn(userText) {
    const userContent = buildUserContent(userText);
    state.history.push(userContent);

    const modelMsg = addMsg("model", "");
    const conv = [...state.history, buildSystem("Use tools as needed, then provide a draft.")];
    let lastText = "";
    const { draft, conversation } = await toolIteration(conv, (delta) => { lastText += delta; modelMsg.set(lastText); });

    state.history.push({ role: "model", parts: [{ text: draft || "" }] });

    const verifyMsg = addMsg("model", "");
    const verified = await verifyPass();
    const injected = verified.replace(/\{\{var:([\w\-]+)\}\}/g, (_, name) => String(state.variables[name] ?? ""));
    verifyMsg.set(injected);
    state.history.push({ role: "model", parts: [{ text: injected }] });
  }

  /* ========================= BINDINGS & BOOTSTRAP ========================= */
  function bindUI() {
    // Save Keys => persist + recheck + refresh models
    if (els.saveKeys) {
      els.saveKeys.onclick = async () => {
        const keys = els.keyInputs.map((i) => i.value.trim()).filter(Boolean);
        setStoredKeys(keys);
        logTool("system", `Saved API keys (${keys.length})`);
        await recheckKeyStatuses();
        await refreshModelList();
      };
    }

    if (els.saveGoals) els.saveGoals.onclick = () => { const g = (els.goals && els.goals.value.trim()) || ""; localStorage.setItem(GOALS_STORAGE, g); logTool("system", "Saved goals"); };
    if (els.clearGoals) els.clearGoals.onclick = () => { localStorage.removeItem(GOALS_STORAGE); if (els.goals) els.goals.value = ""; logTool("system", "Cleared goals"); };

    if (els.addMemory) els.addMemory.onclick = () => {
      const s = (els.memSummary && els.memSummary.value.trim()) || "";
      const v = (els.memValue && els.memValue.value.trim()) || "";
      if (!s || !v) return;
      state.memories.push({ summary: s, value: v, ts: now() });
      if (els.memSummary) els.memSummary.value = "";
      if (els.memValue) els.memValue.value = "";
      localStorage.setItem(MEMS_STORAGE, JSON.stringify(state.memories));
      renderMemories();
    };
    if (els.clearMemory) els.clearMemory.onclick = () => { state.memories = []; localStorage.removeItem(MEMS_STORAGE); renderMemories(); logTool("system", "Cleared memory store"); };

    if (els.runJS) els.runJS.onclick = async () => { const code = (els.jsCode && els.jsCode.value) || ""; const out = await runUserJS(code); if (out && out.result && typeof out.result === "object") { Object.entries(out.result).forEach(([k, v]) => (state.variables[k] = v)); renderVars(); } };
    if (els.clearJS) els.clearJS.onclick = () => { if (els.jsCode) els.jsCode.value = ""; if (els.jsLog) els.jsLog.textContent = ""; };

    if (els.renderHTML) els.renderHTML.onclick = () => { const html = (els.htmlCanvasInput && els.htmlCanvasInput.value) || ""; renderCanvas(html); };
    if (els.clearCanvas) els.clearCanvas.onclick = () => renderCanvas("");

    // Send / Cancel
    let sending = false;
    const setSending = (on) => { sending = on; if (els.send) els.send.textContent = on ? "Cancel" : "Send"; };
    if (els.send) {
      els.send.onclick = async () => {
        if (sending && state.inFlight && state.inFlight.aborter) { state.inFlight.aborter.abort(); logTool("system", "Aborted current request"); setSending(false); return; }
        const text = (els.prompt && els.prompt.value.trim()) || ""; if (!text) return;
        addMsg("user", text); if (els.prompt) els.prompt.value = "";
        try { setSending(true); await runChatTurn(text); } catch (err) { addMsg("model", "Error: " + String((err && err.message) || err)); } finally { setSending(false); }
      };
    }

    // New thread
    if (els.newThread) els.newThread.onclick = () => { state.history = []; state.irc = []; renderIRC(); if (els.chat) els.chat.innerHTML = ""; logTool("system", "Started a new thread"); };

    // Model select: update chosen model
    if (els.model) {
      els.model.onchange = () => {
        const sel = els.model.value;
        state.model = sel;
        logTool("system", `Selected model: ${sel} (method: ${state.streamingMethodByModel[sel] || 'streamGenerateContent'})`);
      };
    }

    // Temperature
    if (els.temp) els.temp.onchange = () => { const t = parseFloat(els.temp.value); state.temperature = isFinite(t) ? clamp(t, 0, 1) : 0.3; };

    // ESC to cancel
    window.addEventListener("keydown", (e) => {
      if (e.key === "Escape" && state.inFlight && state.inFlight.aborter) { state.inFlight.aborter.abort(); logTool("system", "Aborted current request (Esc)"); }
    });
  }

  function loadFromStorage() {
    const keys = getStoredKeys();
    keys.forEach((k, i) => { if (els.keyInputs[i]) els.keyInputs[i].value = k; });

    const t = parseFloat((els.temp && els.temp.value) || "0.3"); state.temperature = isFinite(t) ? t : 0.3;
    state.memories = JSON.parse(localStorage.getItem(MEMS_STORAGE) || "[]"); renderMemories();
    const g = localStorage.getItem(GOALS_STORAGE) || ""; if (els.goals) els.goals.value = g;

    // If a cached model list exists, seed UI immediately (refresh will update)
    const cached = safeJSON(localStorage.getItem(MODELS_CACHE_STORAGE));
    if (cached && Array.isArray(cached.models)) populateModelSelect(cached.models);
    else populateModelSelect([]); // ensures fallback options until we fetch

    updateUsageUI();
    renderIRC();
    renderVars();
  }

  window.addEventListener("load", async () => {
    loadFromStorage();
    bindUI();
    logTool("system", "Booting… fetching model list & key statuses.");
    try {
      await recheckKeyStatuses();
      await refreshModelList();
    } catch (e) {
      // Already handled with fallbacks
    }
    // Auto-refresh models every 30 minutes
    setInterval(refreshModelList, 30 * 60 * 1000);
  });
})();

Domanda

GET https://assets.vercel.com/raw/upload/v1699973030/fonts/geist/GeistVF.woff2 net::ERR_ABORTED 404 (Not Found)Understand this error
(index):1260 GET https://assets.vercel.com/raw/upload/v1699973030/fonts/geist/GeistMonoVF.woff2 net::ERR_ABORTED 404 (Not Found)Understand this error
favicon.ico:1 GET https://k4lp.github.io/favicon.ico 404 (Not Found)Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-2.5-flash-preview-05-20:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-2.5-flash-preview-05-20:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
await in sseRequestWithRetry
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-2.5-flash-preview-05-20:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
await in sseRequestWithRetry
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-2.5-flash:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-2.5-flash:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
await in sseRequestWithRetry
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-2.5-flash:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
await in sseRequestWithRetry
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-flash-lite-latest:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-flash-lite-latest:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
await in sseRequestWithRetry
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-flash-lite-latest:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
await in sseRequestWithRetry
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-flash-latest:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-flash-latest:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
await in sseRequestWithRetry
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error
(index):991 POST https://generativelanguage.googleapis.com/v1beta/models/models%2Fgemini-flash-latest:generateContent?alt=sse&key=AIzaSyDWE8mmkh9gJr1ZT9_dU3QsByhYxGm5aq8 400 (Bad Request)
sseRequestWithRetry @ (index):991
await in sseRequestWithRetry
toolIteration @ (index):1103
runChatTurn @ (index):1148
els.send.onclick @ (index):1201Understand this error

fix this properly. Conduct searches properly.

Pensiero

Fixing endpoint for API calls

The user is facing errors with font URLs and a doubled "models/" prefix issue. I need to adjust the model name handling to remove any extra “models/”, and ensure the correct API endpoint is being used. The issue with the payload might also be related to mismatched settings for the streaming method. I’ll check those.

Fixing API request structure

The 400 error might be because of incorrect JSON field names. I double-checked and it seems the current implementation uses camelCase (e.g., functionDeclarations), but the v1beta API uses snake_case (e.g., function_declarations). I'll adjust the field names to match the correct naming conventions to avoid the error.

Fixing streaming request and assets

The API body for streamGenerateContent needs some adjustments: convert property names to snake_case and sanitize model names to avoid double prefixes. I'll also ensure the correct streaming method is set. Additionally, the asset URLs for fonts are broken (404), so it may be good to update them or recommend local alternatives.

Outputting JS snippet for font fallback

The user requests a JS snippet only, but there are font 404 errors happening. I could provide a JS snippet that detects font load failures and switches to system fonts, or link to possible CSS adjustments. I need to ensure the JS snippet is independent, as per the user’s request.

Providing JS snippet with minimal guidance

The user wants a JS snippet only, so I'll focus on that as the main output. I'll ensure it handles model name sanitization, corrects field names to snake_case, and fixes the API request 400 error. For font loading issues, I'll include a dynamic fallback to system fonts, with minimal guidance on CSS edits if necessary.

Thought for 38s

Risposta

javascript
/*
  DROP-IN REPLACEMENT for your previous <script>…</script> block.
  Paste this WHOLE snippet inside your page’s <script> tags, replacing the old code.

  Fixes & additions for your errors:
  - 400 Bad Request from Gemini:
      • The API expected snake_case fields and correct function-calling shapes.
      • Model names from ListModels already include "models/…"; we now sanitize so the endpoint is not "models/models%2F…".
      • Tool responses must be sent as role:"user" with a `function_response` part (not role:"tool").
  - Auto model list:
      • Fetches live models via ListModels using your keys and builds the <select id="model">.
      • If fetch fails, we fall back to a small built-in list.
      • Picks the right streaming method per model (streamGenerateContent or generateContent with alt=sse).
  - Per-key status + usage panel:
      • Validity checks, HTTP status, local RPM/daily/session usage counters.
  - Fonts & favicon 404:
      • These are outside JS; update your CSS @font-face URLs and <link rel="icon"> in HTML.
      • See comments at the bottom of this file for EXACT lines to change.

  SECURITY NOTE: This enables arbitrary JS execution (tool: run_js). Only run trusted code.

*/

(() => {
  "use strict";

  /* ========================= DOM HOOKS ========================= */
  const q = (id) => document.getElementById(id);
  const els = {
    aside: document.querySelector('aside'),
    model: q('model'),
    keyInputs: [1, 2, 3, 4, 5].map((n) => q('key' + n)).filter(Boolean),
    saveKeys: q('saveKeys'),
    temp: q('temp'),
    send: q('send'),
    newThread: q('newThread'),
    chat: q('chat'),
    prompt: q('prompt'),
    goals: q('goals'),
    saveGoals: q('saveGoals'),
    clearGoals: q('clearGoals'),
    memSummary: q('memSummary'),
    memValue: q('memValue'),
    addMemory: q('addMemory'),
    clearMemory: q('clearMemory'),
    memoryList: q('memoryList'),
    runJS: q('runJS'),
    clearJS: q('clearJS'),
    jsCode: q('jsCode'),
    jsLog: q('jsLog'),
    renderHTML: q('renderHTML'),
    clearCanvas: q('clearCanvas'),
    htmlCanvasInput: q('htmlCanvasInput'),
    canvas: q('canvas'),
    toolLog: q('toolLog'),
    varList: q('varList'),
    ircList: q('ircList'),
  };

  /* ========================= CONSTANTS ========================= */
  const GEMINI_BASE = "https://generativelanguage.googleapis.com/v1beta";
  const MODEL_LIST_PATH = () => `${GEMINI_BASE}/models`;
  const STREAM_ENDPOINT = (model, key, method) =>
    `${GEMINI_BASE}/models/${encodeURIComponent(model)}:${method}?alt=sse&key=${encodeURIComponent(key)}`;

  // Fallback options ONLY if live fetch fails
  const FALLBACK_MODELS = [
    "gemini-1.5-flash-latest",
    "gemini-1.5-pro-latest"
  ];

  // Quotas: local budgets; tune via localStorage key "gemini_quota_config"
  const DEFAULT_QUOTAS = { rpm: 60, daily: 10000, sessionMax: 5000 };

  // Retry/backoff
  const MAX_TOOL_ITERATIONS = 8;
  const MAX_RETRY_PER_CALL = 3;
  const BASE_BACKOFF_MS = 600;
  const JITTER_MS = 400;
  const CIRCUIT_BREAK_MS = 60_000;

  // Storage keys
  const KEYS_STORAGE = "gemini_keys";
  const GOALS_STORAGE = "goals";
  const MEMS_STORAGE = "memories";
  const QUOTA_STORAGE = "gemini_quota_config";
  const MODELS_CACHE_STORAGE = "gemini_models_cache";

  /* ========================= STATE ========================= */
  const state = {
    history: [],
    irc: [],
    memories: [],
    variables: {},

    model: null,
    modelsByName: {},                 // name -> meta
    streamingMethodByModel: {},       // name -> 'streamGenerateContent' | 'generateContent'
    temperature: 0.3,

    keyIndex: 0,
    circuit: {}, // key -> { openUntil }
    usage: {
      session: { requests: 0, inChars: 0, outChars: 0, startedAt: Date.now() },
      perKey: {} // keyHash -> { day, dailyRequests, minuteWindowStart, minuteCount, totalRequests, inChars, outChars }
    },
    keyStatus: {}, // keyHash -> { lastChecked, ok, http, msg }

    inFlight: null
  };

  /* ========================= UTILITIES ========================= */
  const now = () => Date.now();
  const toISODate = (ms) => new Date(ms).toISOString().slice(0, 10);
  const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
  const jitter = () => Math.floor(Math.random() * JITTER_MS);
  const clamp = (n, lo, hi) => Math.max(lo, Math.min(hi, n));
  const safeJSON = (s) => { try { return JSON.parse(s); } catch { return null; } };
  const has = (o,k) => Object.prototype.hasOwnProperty.call(o,k);

  function el(tag, cls) { const e = document.createElement(tag); if (cls) e.className = cls; return e; }
  function escapeHtml(s) {
    return String(s).replace(/[&<>"']/g, (m) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#039;" }[m]));
  }
  function asDisplay(v) { try { return typeof v === "string" ? v : JSON.stringify(v, null, 2); } catch { return String(v); } }

  function hashKey(k) { let h = 0; for (let i = 0; i < k.length; i++) h = (h * 31 + k.charCodeAt(i)) | 0; return "k" + (h >>> 0).toString(16); }

  // Normalize model name from ListModels:
  // API returns "models/gemini-…". For endpoints we need only the suffix after "models/".
  function normalizedModelName(name) {
    return name.startsWith("models/") ? name.slice("models/".length) : name;
  }

  /* ========================= LOGGING ========================= */
  function logTool(who, text) {
    const line = `[${new Date().toLocaleTimeString()}] ${who.toUpperCase()}: ${text}\n`;
    if (els.toolLog) { els.toolLog.textContent += line; els.toolLog.scrollTop = els.toolLog.scrollHeight; }
    else { console.log(line.trim()); }
  }

  /* ========================= USAGE PANEL ========================= */
  function ensureUsagePanel() {
    if (!els.aside) return null;
    let panel = q('usagePanel');
    if (panel) return panel;
    panel = el('div', 'section');
    panel.id = 'usagePanel';
    panel.innerHTML = `
      <h2>Usage</h2>
      <div id="usageSummary" class="small mono"></div>
      <div id="usageKeys" class="small mono" style="margin-top:6px"></div>
      <div class="divider"></div>
      <h2>Key Status & Rate Limits</h2>
      <div id="rateLimits" class="small mono"></div>
    `;
    els.aside.appendChild(panel);
    return panel;
  }

  function updateUsageUI() {
    ensureUsagePanel();
    const session = state.usage.session;
    const sumEl = q('usageSummary');
    const keysEl = q('usageKeys');
    const rateEl = q('rateLimits');
    const quota = getQuotaConfig();
    if (sumEl) sumEl.textContent =
      `Session requests: ${session.requests}/${quota.sessionMax} | In chars: ${session.inChars} | Out chars: ${session.outChars}`;
    if (keysEl) {
      const lines = [];
      for (const [kh, v] of Object.entries(state.usage.perKey)) {
        lines.push(`${kh}: day ${v.day} | daily ${v.dailyRequests}/${quota.daily} | minute ${v.minuteCount}/${quota.rpm} | total ${v.totalRequests}`);
      }
      keysEl.textContent = lines.join('\n') || '(no key usage yet)';
    }
    if (rateEl) {
      const keys = getStoredKeys();
      if (!keys.length) { rateEl.textContent = '(enter and save API keys to view status)'; return; }
      const rows = [];
      for (const k of keys) {
        const kh = hashKey(k);
        const st = state.keyStatus[kh] || {};
        const u = state.usage.perKey[kh];
        const validity = st.ok ? 'OK' : (st.http ? `HTTP ${st.http}` : 'Unknown');
        const msg = st.msg ? ` — ${st.msg}` : '';
        rows.push(`${kh}: ${validity}${msg}`);
        if (u) rows.push(`  usage → minute ${u.minuteCount}/${getQuotaConfig().rpm}, daily ${u.dailyRequests}/${getQuotaConfig().daily}, total ${u.totalRequests}`);
      }
      rateEl.textContent = rows.join('\n');
    }
  }

  /* ========================= UI HELPERS ========================= */
  function addMsg(role, content) {
    if (!els.chat) return { pre: { textContent: '' }, set: () => {} };
    const wrap = el("div", "msg " + role);
    const meta = el("div", "meta"); meta.textContent = role === "user" ? "You" : "Model";
    const pre = el("div"); pre.className = "mono"; pre.style.whiteSpace = "pre-wrap"; pre.textContent = content || "";
    wrap.appendChild(meta); wrap.appendChild(pre); els.chat.appendChild(wrap); els.chat.scrollTop = els.chat.scrollHeight;
    return { pre, set: (t) => { pre.textContent = t; els.chat.scrollTop = els.chat.scrollHeight; } };
  }
  function renderIRC() { if (els.ircList) els.ircList.textContent = state.irc.length ? state.irc.map((s, i) => `${i + 1}. ${s}`).join("\n") : "(empty)"; }
  function renderVars() {
    if (!els.varList) return;
    const entries = Object.entries(state.variables);
    els.varList.innerHTML = entries.length ? entries.map(([k, v]) => `<span class="kv mono">${escapeHtml(k)} = ${escapeHtml(String(v))}</span>`).join("") : "";
  }
  function renderMemories() {
    if (!els.memoryList) return;
    if (!state.memories.length) { els.memoryList.innerHTML = '<div class="small">No memory items yet.</div>'; return; }
    els.memoryList.innerHTML = state.memories.map((m, i) => `
      <div style="margin-bottom:10px">
        <div><span class="pill">#${i}</span> <strong>${escapeHtml(m.summary)}</strong></div>
        <div class="small mono" style="margin-top:4px; white-space:pre-wrap">${escapeHtml(m.value)}</div>
      </div>`).join("");
  }

  /* ========================= STORAGE ========================= */
  function getStoredKeys() { return JSON.parse(localStorage.getItem(KEYS_STORAGE) || "[]"); }
  function setStoredKeys(arr) { localStorage.setItem(KEYS_STORAGE, JSON.stringify(arr)); }
  function getQuotaConfig() {
    const cfg = JSON.parse(localStorage.getItem(QUOTA_STORAGE) || "null");
    return {
      rpm: (cfg && +cfg.rpm) || DEFAULT_QUOTAS.rpm,
      daily: (cfg && +cfg.daily) || DEFAULT_QUOTAS.daily,
      sessionMax: (cfg && +cfg.sessionMax) || DEFAULT_QUOTAS.sessionMax
    };
  }

  /* ========================= USAGE & QUOTA ========================= */
  function initKeyUsage(key) {
    const kh = hashKey(key);
    const today = toISODate(now());
    const u = state.usage.perKey[kh];
    if (!u || u.day !== today) {
      state.usage.perKey[kh] = {
        day: today, dailyRequests: 0,
        minuteWindowStart: now(), minuteCount: 0,
        totalRequests: (u && u.totalRequests) || 0,
        inChars: (u && u.inChars) || 0, outChars: (u && u.outChars) || 0
      };
    }
  }
  function addInChars(key, n) {
    const kh = hashKey(key); initKeyUsage(key);
    state.usage.perKey[kh].inChars += n; state.usage.session.inChars += n; updateUsageUI();
  }
  function addOutChars(key, n) {
    const kh = hashKey(key); initKeyUsage(key);
    state.usage.perKey[kh].outChars += n; state.usage.session.outChars += n; updateUsageUI();
  }
  function checkAndConsumeQuota(key) {
    const quota = getQuotaConfig();
    if (state.usage.session.requests >= quota.sessionMax) throw new Error("Session request limit reached.");
    initKeyUsage(key);
    const kh = hashKey(key);
    const u = state.usage.perKey[kh];
    const nowMs = now();

    if (u.dailyRequests >= quota.daily) throw new Error(`Daily quota reached for key ${kh}.`);
    if (nowMs - u.minuteWindowStart >= 60_000) { u.minuteWindowStart = nowMs; u.minuteCount = 0; }
    if (u.minuteCount >= quota.rpm) throw new Error(`Per-minute quota reached for key ${kh}.`);

    u.minuteCount++; u.dailyRequests++; u.totalRequests++; state.usage.session.requests++; updateUsageUI();
  }

  /* ========================= KEY MANAGEMENT ========================= */
  function getActiveKey() {
    const keys = getStoredKeys();
    if (!keys.length) throw new Error("No API key found. Save up to five keys.");
    let i = 0;
    while (i < keys.length) {
      const idx = state.keyIndex % keys.length;
      const k = keys[idx];
      const circuit = state.circuit[k];
      if (!circuit || circuit.openUntil <= now()) return k;
      state.keyIndex++; i++;
    }
    throw new Error("All keys are temporarily paused by circuit breaker.");
  }
  function rotateKey(reason) { state.keyIndex++; logTool("system", `Rotating key${reason ? `: ${reason}` : ""}`); }
  function openCircuitFor(key, ms) { state.circuit[key] = { openUntil: now() + ms }; logTool("system", `Circuit opened for current key for ${Math.round(ms / 1000)}s`); }

  /* ========================= JS EXECUTION & CANVAS ========================= */
  async function runUserJS(src) {
    if (els.jsLog) els.jsLog.textContent = "";
    const originalLog = console.log;
    let logs = [];
    console.log = (...args) => { logs.push(args.map((a) => asDisplay(a)).join(" ")); originalLog(...args); };
    try {
      const fn = new Function(`return (async ()=>{ ${src}\n })()`);
      const result = await fn();
      console.log = originalLog;
      if (els.jsLog) els.jsLog.textContent = logs.map((l) => "• " + l).join("\n") + (result !== undefined ? `\n\nreturn → ${asDisplay(result)}` : "");
      logTool("run_js", `Executed (${src.length} chars)`);
      return { logs, result };
    } catch (err) {
      console.log = originalLog;
      if (els.jsLog) els.jsLog.textContent = (logs.length ? logs.map((l) => "• " + l).join("\n") + "\n\n" : "") + "ERROR → " + String(err && err.stack || err);
      logTool("run_js", `Error: ${String(err)}`);
      return { logs, error: String(err) };
    }
  }
  function renderCanvas(html) { if (els.canvas) { els.canvas.innerHTML = html; logTool("render_html", "Updated canvas"); } }

  /* ========================= TOOLS DECLARATIONS ========================= */
  const functionDeclarations = [
    { name: "fetch_memory", description: "Fetch a detailed memory by index from provided memory summaries.", parameters: { type: "OBJECT", properties: { index: { type: "INTEGER" } }, required: ["index"] } },
    { name: "list_memories", description: "List available memory summaries with indices.", parameters: { type: "OBJECT", properties: {} } },
    { name: "irc_add", description: "Append one step to the Immediate Reasoning Chain for the current reply.", parameters: { type: "OBJECT", properties: { step: { type: "STRING" } }, required: ["step"] } },
    { name: "run_js", description: "Execute JavaScript in the browser. Use for network fetch, compute, parsing. Return logs and result.", parameters: { type: "OBJECT", properties: { code: { type: "STRING" } }, required: ["code"] } },
    { name: "render_html", description: "Render HTML into the canvas region for previews or interactive reasoning.", parameters: { type: "OBJECT", properties: { html: { type: "STRING" } }, required: ["html"] } },
    { name: "set_var", description: "Set a named variable for later injection into the final answer using {{var:NAME}}.", parameters: { type: "OBJECT", properties: { name: { type: "STRING" }, value: { type: "STRING" } }, required: ["name", "value"] } },
    { name: "get_var", description: "Get a named variable value previously set.", parameters: { type: "OBJECT", properties: { name: { type: "STRING" } }, required: ["name"] } },
    { name: "list_tools", description: "Return a concise list of available tools and when to use them.", parameters: { type: "OBJECT", properties: {} } }
  ];

  /* ========================= SYSTEM INSTRUCTION ========================= */
  function buildSystemInstruction() {
    const memorySummaries = state.memories.map((m, i) => `#${i}: ${m.summary}`).join("\n") || "(none)";
    const ircSoFar = state.irc.length ? state.irc.map((s, i) => `${i + 1}. ${s}`).join("\n") : "(empty)";
    const goals = (els.goals && els.goals.value.trim()) || "(none)";
    return [
      "You are a helpful model with access to an External Tools system. Do not reveal chain-of-thought.",
      "Work in iterations: plan → (optionally call tools) → draft → verify against goals → final. Keep planning brief via irc_add.",
      "",
      "DATA STRUCTURES:",
      "• Memory: You receive only memory summaries; call list_memories then fetch_memory(index) when needed.",
      "• Immediate Reasoning Chain (IRC): Steps for the current reply only. Append short steps with irc_add(step).",
      "• Goals: Global constraints to satisfy in the final answer. A verification pass checks your draft with Goals + IRC.",
      "",
      "TOOLS:",
      "• run_js({code}): Executes real JS in the user's browser (network fetch allowed).",
      "• render_html({html}): Renders HTML into a visible canvas.",
      "• set_var/get_var: Manage variables for final answer placeholders {{var:NAME}}.",
      "• list_memories/fetch_memory, list_tools.",
      "",
      "OUTPUT PROTOCOL:",
      "• Do not output chain-of-thought.",
      "• If you include JS-produced content in the final answer, set a variable via set_var and reference it as {{var:NAME}}.",
      "",
      "SUPPLIED CONTEXT:",
      `• Memory Summaries:\n${memorySummaries}`,
      `• Immediate Reasoning Chain:\n${ircSoFar}`,
      `• Goals:\n${goals}`
    ].join("\n");
  }

  /* ========================= MODEL LIST (ListModels) ========================= */
  async function fetchAllModelsWithAnyKey() {
    const keys = getStoredKeys();
    if (!keys.length) throw new Error("No API key found to fetch model list.");

    const models = [];
    let ok = false;

    for (let i = 0; i < keys.length; i++) {
      const key = keys[(state.keyIndex + i) % keys.length];
      try { checkAndConsumeQuota(key); } catch { continue; }

      let pageToken = null;
      try {
        do {
          const url = new URL(MODEL_LIST_PATH());
          url.searchParams.set("key", key);
          url.searchParams.set("pageSize", "100");
          if (pageToken) url.searchParams.set("pageToken", pageToken);

          const res = await fetch(url.toString(), { method: "GET" });
          const kh = hashKey(key);
          state.keyStatus[kh] = { lastChecked: now(), ok: res.ok, http: res.status, msg: res.ok ? "Listed models" : "Failed to list models" };

          if (!res.ok) {
            if (res.status === 401 || res.status === 403) openCircuitFor(key, 5 * CIRCUIT_BREAK_MS);
            if (res.status === 429 || res.status === 503) openCircuitFor(key, CIRCUIT_BREAK_MS);
            rotateKey(`ListModels HTTP ${res.status}`);
            break; // try next key
          }

          const txt = await res.text();
          addOutChars(key, txt.length);
          const json = safeJSON(txt) || {};
          const pageModels = Array.isArray(json.models) ? json.models : [];
          models.push(...pageModels);
          pageToken = json.nextPageToken || null;
          ok = true;
        } while (pageToken);

        if (ok) { state.keyIndex = (state.keyIndex + i) % keys.length; break; }
      } catch (err) {
        const kh = hashKey(key);
        state.keyStatus[kh] = { lastChecked: now(), ok: false, http: 0, msg: String(err) };
        openCircuitFor(key, CIRCUIT_BREAK_MS);
        continue;
      }
    }

    updateUsageUI();
    if (!ok) throw new Error("Could not fetch models with any available key.");
    return models;
  }

  function selectStreamingMethod(meta) {
    const methods = meta.supportedGenerationMethods || [];
    if (methods.includes("streamGenerateContent")) return "streamGenerateContent";
    if (methods.includes("generateContent") || methods.includes("create")) return "generateContent";
    return null;
  }

  function populateModelSelect(models) {
    if (!els.model) return;

    els.model.innerHTML = "";
    const usable = [];

    for (const m of models) {
      const method = selectStreamingMethod(m);
      if (!method) continue;
      const human = m.displayName || m.name;
      const canonical = normalizedModelName(m.name);
      usable.push({ name: canonical, method, displayName: human });
      state.modelsByName[canonical] = m;
      state.streamingMethodByModel[canonical] = method;
    }

    if (usable.length === 0) {
      // Fallback only if nothing usable came back
      for (const f of FALLBACK_MODELS) {
        const opt = el("option");
        opt.value = f; opt.textContent = f;
        els.model.appendChild(opt);
        state.streamingMethodByModel[f] = "streamGenerateContent"; // sensible default
      }
      state.model = state.model || FALLBACK_MODELS[0];
      els.model.value = state.model;
      logTool("system", "Using fallback model list (live fetch yielded no usable models).");
      return;
    }

    usable.sort((a, b) => {
      const la = a.name.includes("latest") ? 1 : 0;
      const lb = b.name.includes("latest") ? 1 : 0;
      if (la !== lb) return lb - la;
      const fa = a.name.includes("flash") ? 1 : 0;
      const fb = b.name.includes("flash") ? 1 : 0;
      if (fa !== fb) return fb - fa;
      const pa = a.name.includes("pro") ? 1 : 0;
      const pb = b.name.includes("pro") ? 1 : 0;
      return pb - pa;
    });

    for (const u of usable) {
      const opt = el("option");
      opt.value = u.name;
      opt.textContent = u.displayName;
      els.model.appendChild(opt);
    }

    if (!state.model || !state.streamingMethodByModel[state.model]) state.model = usable[0].name;
    els.model.value = state.model;
    logTool("system", `Model list updated (${usable.length} usable). Selected: ${state.model}`);
  }

  async function refreshModelList() {
    if (!els.model) return;
    els.model.disabled = true;
    const prev = els.model.value;
    els.model.innerHTML = "";
    const loading = el("option"); loading.value = ""; loading.textContent = "Loading models…"; els.model.appendChild(loading);

    try {
      const cached = safeJSON(localStorage.getItem(MODELS_CACHE_STORAGE));
      if (cached && Array.isArray(cached.models) && now() - (cached.cachedAt || 0) < 30 * 60 * 1000) {
        populateModelSelect(cached.models);
      } else {
        const live = await fetchAllModelsWithAnyKey();
        localStorage.setItem(MODELS_CACHE_STORAGE, JSON.stringify({ models: live, cachedAt: now() }));
        populateModelSelect(live);
      }
    } catch (e) {
      logTool("system", "Model list fetch failed. Using fallback options.");
      populateModelSelect([]); // triggers fallback list only
    } finally {
      els.model.disabled = false;
      if (prev && state.streamingMethodByModel[prev]) { els.model.value = prev; state.model = prev; }
      updateUsageUI();
    }
  }

  async function recheckKeyStatuses() {
    const keys = getStoredKeys();
    if (!keys.length) { updateUsageUI(); return; }

    for (let i = 0; i < keys.length; i++) {
      const key = keys[i];
      const url = new URL(MODEL_LIST_PATH());
      url.searchParams.set("key", key);
      url.searchParams.set("pageSize", "1");
      try {
        checkAndConsumeQuota(key);
        const res = await fetch(url.toString(), { method: "GET" });
        const kh = hashKey(key);
        state.keyStatus[kh] = { lastChecked: now(), ok: res.ok, http: res.status, msg: res.ok ? "OK" : "Not authorized or invalid" };
        if (res.status === 401 || res.status === 403) openCircuitFor(key, 5 * CIRCUIT_BREAK_MS);
        if (res.status === 429 || res.status === 503) openCircuitFor(key, CIRCUIT_BREAK_MS);
      } catch (err) {
        const kh = hashKey(key);
        state.keyStatus[kh] = { lastChecked: now(), ok: false, http: 0, msg: String(err) };
      }
    }
    updateUsageUI();
  }

  /* ========================= GEMINI STREAMING (snake_case payloads) ========================= */
  function buildPayload(contents) {
    return {
      system_instruction: { parts: [{ text: buildSystemInstruction() }] },
      tools: [{ function_declarations: functionDeclarations }],
      contents,
      generation_config: {
        temperature: (els.temp && Number(els.temp.value || "0.3")) || state.temperature,
        candidate_count: 1
      },
      safety_settings: []
    };
  }

  async function* readSSE(stream, currentKey) {
    const reader = stream.getReader();
    const decoder = new TextDecoder("utf-8");
    let buf = "";
    while (true) {
      const { value, done } = await reader.read();
      if (done) break;
      const textChunk = decoder.decode(value, { stream: true });
      addOutChars(currentKey, textChunk.length);
      buf += textChunk;
      let idx;
      while ((idx = buf.indexOf("\n\n")) >= 0) {
        const chunk = buf.slice(0, idx).trim();
        buf = buf.slice(idx + 2);
        if (!chunk) continue;
        const lines = chunk.split("\n").map((s) => s.trim());
        for (const l of lines) {
          if (!l.startsWith("data:")) continue;
          const payload = l.slice(5).trim();
          if (!payload || payload === "[DONE]") continue;
          const obj = safeJSON(payload);
          if (obj) yield obj;
        }
      }
    }
  }

  function extractParts(evt) {
    const out = { textDelta: "", toolCalls: [] };
    const cands = evt.candidates || [];
    for (const c of cands) {
      const parts = (c.content && c.content.parts) || [];
      for (const p of parts) {
        if (p.text) out.textDelta += p.text;
        // Accept either snake_case or camelCase from API
        if (p.function_call) out.toolCalls.push(p.function_call);
        else if (p.functionCall) out.toolCalls.push(p.functionCall);
      }
    }
    return out;
  }

  async function sseRequestWithRetry(payload, kind) {
    let attempts = 0;
    while (attempts < MAX_RETRY_PER_CALL) {
      const key = getActiveKey();
      try { checkAndConsumeQuota(key); } 
      catch (quotaErr) { rotateKey(String(quotaErr)); attempts++; continue; }

      const modelName = state.model;
      const method = state.streamingMethodByModel[modelName] || "streamGenerateContent";
      const url = STREAM_ENDPOINT(modelName, key, method);
      const bodyStr = JSON.stringify(payload);
      addInChars(key, bodyStr.length);

      const aborter = new AbortController();
      state.inFlight = { aborter, kind };
      let res;
      try {
        res = await fetch(url, { method: "POST", headers: { "Content-Type": "application/json" }, body: bodyStr, signal: aborter.signal });
      } catch (err) {
        openCircuitFor(key, CIRCUIT_BREAK_MS);
        rotateKey("network error");
        attempts++; await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter()); continue;
      } finally {
        state.inFlight = null;
      }

      if (res.status === 429 || res.status === 503) {
        openCircuitFor(key, CIRCUIT_BREAK_MS);
        rotateKey(`HTTP ${res.status}`);
        attempts++; await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter()); continue;
      }
      if (res.status === 401 || res.status === 403) {
        openCircuitFor(key, 5 * CIRCUIT_BREAK_MS);
        rotateKey(`HTTP ${res.status}`);
        attempts++; continue;
      }
      if (!res.ok) {
        const text = await (async()=>{ try { return await res.text(); } catch { return "(no body)"; }})();
        logTool("system", `Gemini error ${res.status}: ${text.slice(0, 400)}`);
        attempts++; await sleep(BASE_BACKOFF_MS * Math.pow(2, attempts - 1) + jitter()); continue;
      }
      return { stream: res.body, key }; // success
    }
    throw new Error("All retries exhausted.");
  }

  /* ========================= TOOLS RUNTIME (function_response as user) ========================= */
  function toolResponseContent(name, response) {
    return {
      role: "user",
      parts: [
        {
          function_response: {
            name,
            response: typeof response === "object" && response !== null ? response : { data: String(response) }
          }
        }
      ]
    };
  }

  async function execTool(call) {
    const { name, args } = call;
    try {
      switch (name) {
        case "list_tools": {
          const tools = [
            { name: "fetch_memory(index)", use: "Retrieve detailed memory by index" },
            { name: "list_memories()", use: "List memory summaries and indices" },
            { name: "irc_add(step)", use: "Append one planning/validation step" },
            { name: "run_js(code)", use: "Execute JS in browser; can fetch the internet" },
            { name: "render_html(html)", use: "Render HTML in canvas" },
            { name: "set_var(name,value) / get_var(name)", use: "Manage variables for {{var:NAME}} replacement" }
          ];
          logTool("tool", "list_tools called");
          return toolResponseContent("list_tools", { tools });
        }
        case "list_memories": {
          const summaries = state.memories.map((m, i) => ({ index: i, summary: m.summary }));
          logTool("tool", "list_memories called");
          return toolResponseContent("list_memories", { summaries });
        }
        case "fetch_memory": {
          const i = Number(args?.index);
          if (Number.isNaN(i) || i < 0 || i >= state.memories.length) throw new Error("Invalid memory index");
          logTool("tool", `fetch_memory #${i}`);
          return toolResponseContent("fetch_memory", { index: i, value: state.memories[i].value, summary: state.memories[i].summary });
        }
        case "irc_add": {
          const step = String(args?.step || "").slice(0, 500);
          if (step) state.irc.push(step);
          renderIRC();
          logTool("tool", `irc_add "${step}"`);
          return toolResponseContent("irc_add", { ok: true, length: state.irc.length });
        }
        case "run_js": {
          const code = String(args?.code || "");
          logTool("tool", `run_js (${code.length} chars)`);
          const out = await runUserJS(code);
          if (out && out.result && typeof out.result === "object") { Object.entries(out.result).forEach(([k, v]) => (state.variables[k] = v)); renderVars(); }
          return toolResponseContent("run_js", out);
        }
        case "render_html": {
          const html = String(args?.html || "");
          renderCanvas(html);
          return toolResponseContent("render_html", { ok: true });
        }
        case "set_var": {
          const name = String(args?.name || "").trim();
          const value = String(args?.value ?? "");
          if (!name) throw new Error("name required");
          state.variables[name] = value; renderVars(); logTool("tool", `set_var ${name}`);
          return toolResponseContent("set_var", { ok: true });
        }
        case "get_var": {
          const name = String(args?.name || "").trim();
          const value = state.variables[name];
          logTool("tool", `get_var ${name}`);
          return toolResponseContent("get_var", { name, value: value ?? null });
        }
        default:
          logTool("tool", `Unknown tool: ${name}`);
          return toolResponseContent(name, { error: `Unknown tool ${name}` });
      }
    } catch (err) {
      logTool("tool", `Error in ${name}: ${String(err)}`);
      return toolResponseContent(name, { error: String(err) });
    }
  }

  /* ========================= CHAT LOOP ========================= */
  function buildUserContent(text) { return { role: "user", parts: [{ text }] }; }
  function buildSystem(text) { return { role: "user", parts: [{ text }] }; }

  async function toolIteration(conversation, streamSink) {
    let iteration = 0;
    while (iteration++ < MAX_TOOL_ITERATIONS) {
      const payload = buildPayload(conversation);
      let draft = "";
      let toolCallsHappened = false;

      const { stream, key } = await sseRequestWithRetry(payload, "draft");
      for await (const evt of readSSE(stream, key)) {
        const { textDelta, toolCalls } = extractParts(evt);
        if (textDelta) { draft += textDelta; streamSink(textDelta); }
        if (toolCalls && toolCalls.length) {
          toolCallsHappened = true;
          for (const call of toolCalls) {
            logTool("intention", `Tool call requested: ${call.name}`);
            const toolContent = await execTool(call);
            conversation.push(toolContent);
          }
        }
      }
      if (toolCallsHappened) continue; // let the model consume tool results
      return { draft, conversation };
    }
    throw new Error("Maximum tool iterations exceeded.");
  }

  async function verifyPass() {
    const verifyPrompt = [
      "VERIFY AGAINST GOALS.",
      "Given the previous draft answer, STRICTLY check it against the Goals and the IRC (steps).",
      "If the draft fully satisfies all goals, return a concise, professional FINAL answer.",
      "Otherwise, revise it to satisfy all goals and return only the revised FINAL answer.",
      "Do NOT include analysis. Do NOT mention verification.",
      "If the draft used variables like {{var:NAME}}, keep those placeholders intact."
    ].join(" ");
    const verifyConversation = [...state.history, { role: "user", parts: [{ text: verifyPrompt }] }];
    const payload = buildPayload(verifyConversation);
    const { stream, key } = await sseRequestWithRetry(payload, "verify");
    let verified = "";
    for await (const evt of readSSE(stream, key)) {
      const { textDelta } = extractParts(evt);
      if (textDelta) verified += textDelta;
    }
    return verified;
  }

  async function runChatTurn(userText) {
    const userContent = buildUserContent(userText);
    state.history.push(userContent);

    const modelMsg = addMsg("model", "");
    const conv = [...state.history, buildSystem("Use tools as needed, then provide a draft.")];
    let lastText = "";
    const { draft, conversation } = await toolIteration(conv, (delta) => { lastText += delta; modelMsg.set(lastText); });

    state.history.push({ role: "model", parts: [{ text: draft || "" }] });

    const verifyMsg = addMsg("model", "");
    const verified = await verifyPass();
    const injected = verified.replace(/\{\{var:([\w\-]+)\}\}/g, (_, name) => String(state.variables[name] ?? ""));
    verifyMsg.set(injected);
    state.history.push({ role: "model", parts: [{ text: injected }] });
  }

  /* ========================= BINDINGS & BOOTSTRAP ========================= */
  function bindUI() {
    if (els.saveKeys) {
      els.saveKeys.onclick = async () => {
        const keys = els.keyInputs.map((i) => i.value.trim()).filter(Boolean);
        localStorage.setItem("gemini_keys", JSON.stringify(keys));
        logTool("system", `Saved API keys (${keys.length})`);
        await recheckKeyStatuses();
        await refreshModelList();
      };
    }

    if (els.saveGoals) els.saveGoals.onclick = () => { const g = (els.goals && els.goals.value.trim()) || ""; localStorage.setItem(GOALS_STORAGE, g); logTool("system", "Saved goals"); };
    if (els.clearGoals) els.clearGoals.onclick = () => { localStorage.removeItem(GOALS_STORAGE); if (els.goals) els.goals.value = ""; logTool("system", "Cleared goals"); };

    if (els.addMemory) els.addMemory.onclick = () => {
      const s = (els.memSummary && els.memSummary.value.trim()) || "";
      const v = (els.memValue && els.memValue.value.trim()) || "";
      if (!s || !v) return;
      state.memories.push({ summary: s, value: v, ts: now() });
      if (els.memSummary) els.memSummary.value = "";
      if (els.memValue) els.memValue.value = "";
      localStorage.setItem(MEMS_STORAGE, JSON.stringify(state.memories));
      renderMemories();
    };
    if (els.clearMemory) els.clearMemory.onclick = () => { state.memories = []; localStorage.removeItem(MEMS_STORAGE); renderMemories(); logTool("system", "Cleared memory store"); };

    if (els.runJS) els.runJS.onclick = async () => { const code = (els.jsCode && els.jsCode.value) || ""; const out = await runUserJS(code); if (out && out.result && typeof out.result === "object") { Object.entries(out.result).forEach(([k, v]) => (state.variables[k] = v)); renderVars(); } };
    if (els.clearJS) els.clearJS.onclick = () => { if (els.jsCode) els.jsCode.value = ""; if (els.jsLog) els.jsLog.textContent = ""; };

    if (els.renderHTML) els.renderHTML.onclick = () => { const html = (els.htmlCanvasInput && els.htmlCanvasInput.value) || ""; renderCanvas(html); };
    if (els.clearCanvas) els.clearCanvas.onclick = () => renderCanvas("");

    // Send / Cancel
    let sending = false;
    const setSending = (on) => { sending = on; if (els.send) els.send.textContent = on ? "Cancel" : "Send"; };
    if (els.send) {
      els.send.onclick = async () => {
        if (sending && state.inFlight && state.inFlight.aborter) { state.inFlight.aborter.abort(); logTool("system", "Aborted current request"); setSending(false); return; }
        const text = (els.prompt && els.prompt.value.trim()) || ""; if (!text) return;
        addMsg("user", text); if (els.prompt) els.prompt.value = "";
        try { setSending(true); await runChatTurn(text); } catch (err) { addMsg("model", "Error: " + String((err && err.message) || err)); } finally { setSending(false); }
      };
    }

    // New thread
    if (els.newThread) els.newThread.onclick = () => { state.history = []; state.irc = []; renderIRC(); if (els.chat) els.chat.innerHTML = ""; logTool("system", "Started a new thread"); };

    // Model select
    if (els.model) {
      els.model.onchange = () => {
        const sel = els.model.value;
        state.model = sel;
        logTool("system", `Selected model: ${sel} (method: ${state.streamingMethodByModel[sel] || 'streamGenerateContent'})`);
      };
    }

    // Temperature
    if (els.temp) els.temp.onchange = () => { const t = parseFloat(els.temp.value); state.temperature = isFinite(t) ? clamp(t, 0, 1) : 0.3; };

    // ESC to cancel
    window.addEventListener("keydown", (e) => {
      if (e.key === "Escape" && state.inFlight && state.inFlight.aborter) { state.inFlight.aborter.abort(); logTool("system", "Aborted current request (Esc)"); }
    });
  }

  function loadFromStorage() {
    const keys = getStoredKeys();
    keys.forEach((k, i) => { if (els.keyInputs[i]) els.keyInputs[i].value = k; });

    const t = parseFloat((els.temp && els.temp.value) || "0.3"); state.temperature = isFinite(t) ? t : 0.3;
    state.memories = JSON.parse(localStorage.getItem(MEMS_STORAGE) || "[]"); renderMemories();
    const g = localStorage.getItem(GOALS_STORAGE) || ""; if (els.goals) els.goals.value = g;

    // Seed model select quickly
    const cached = safeJSON(localStorage.getItem(MODELS_CACHE_STORAGE));
    if (cached && Array.isArray(cached.models)) populateModelSelect(cached.models);
    else populateModelSelect([]); // ensures fallback options until we fetch

    updateUsageUI();
    renderIRC();
    renderVars();
  }

  window.addEventListener("load", async () => {
    loadFromStorage();
    bindUI();
    logTool("system", "Booting… checking keys & fetching model list.");
    try {
      await recheckKeyStatuses();
      await refreshModelList();
    } catch {}
    setInterval(refreshModelList, 30 * 60 * 1000);
  });

  /* ========================= ADDITIONAL NOTES (fonts & favicon) =========================
   To fix the 404s you saw:

   1) Fonts (Geist URLs 404):
      - In your <style> @font-face blocks, replace the old URLs with working ones or host your own.
      - Example (replace in your HTML/CSS, not here in JS):
        @font-face {
          font-family: "Geist";
          src: url("https://cdn.jsdelivr.net/gh/vercel/geist-font/packages/geist/dist/GeistVF.woff2") format("woff2");
          font-weight: 100 900; font-style: normal; font-display: swap;
        }
        @font-face {
          font-family: "Geist Mono";
          src: url("https://cdn.jsdelivr.net/gh/vercel/geist-font/packages/geist/dist/GeistMonoVF.woff2") format("woff2");
          font-weight: 100 900; font-style: normal; font-display: swap;
        }

   2) Favicon 404:
      - Add/replace in <head>:
        <link rel="icon" href="/favicon.ico">
      - Or host one at your GitHub Pages path and point to it.

   These two changes are in your HTML/CSS files; this JS does not alter them.
  ================================================================== */
})();

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