using System.Collections; using System.Collections...

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class BuildingGridPlacer : BuildingPlacer
{
public static bool IsPlacingBuilding = false;

text
public globalControl scriptGlobalUI;
public ap0Control script0UI;

public Vector2 cellSize = new Vector2(1, 1);
public Vector2 gridOffset;

public Renderer gridRenderer;

public bool isIsometric = false; 

private bool isMobile;
private bool isDragging = false;

private Vector2 lastTouchPosition;

#if UNITY_EDITOR
private void OnValidate()
{
_UpdateGridVisual();
}
#endif

text
private void Start()
{
    isMobile = Application.isMobilePlatform;

    _UpdateGridVisual();
    _EnableGridVisual(false);
}

private void Update()
{
    if (_buildingPrefab != null)
    {
        if (isMobile)
        {
            _HandleMobileInput();
        }
        else
        {
            _HandlePCInput();
        }
    }
}

private void _HandlePCInput()
{
    if (_buildingPrefab != null)
    {
        if (Input.GetMouseButtonDown(1))
        {
            _CancelBuildingMode();
            return;
        }

        if (EventSystem.current.IsPointerOverGameObject())
        {
            if (Input.GetMouseButtonDown(0))
            {
                _CancelBuildingMode();
                return;
            }

            if (_toBuild.activeSelf) _toBuild.SetActive(false);
            return;
        }
        else if (!_toBuild.activeSelf) _toBuild.SetActive(true);

        if (Input.GetKeyDown(KeyCode.Space))
        {
            // esta madre no hace nada
        }

        Vector3 mouseWorldPos3D = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        Vector2 mouseWorldPos = new Vector2(mouseWorldPos3D.x, mouseWorldPos3D.y);

        Vector2 snappedPos = isIsometric
            ? _ClampToNearestIsometric(mouseWorldPos, cellSize)
            : _ClampToNearest(mouseWorldPos, cellSize);

        _toBuild.transform.position = new Vector3(snappedPos.x, snappedPos.y, _toBuild.transform.position.z);

        foreach (SpriteRenderer sr in _toBuild.GetComponent<BuildingManager>().spriteRenderers)
        {
            sr.sortingOrder = _CalculateSortingOrder(sr.transform.position) + 1000;
        }

        if (Input.GetMouseButtonDown(0))
        {
            _InstanceBuilding();
            return;
        }
    }
}

private void _HandleMobileInput()
{
    if (Input.touchCount > 0)
    {
        Touch touch = Input.GetTouch(0);

        // Si el usuario toca (tap) sobre la UI, cancelar modo construcción
        if (touch.phase == TouchPhase.Began && IsPointerOverUI(touch.position))
        {
            _CancelBuildingMode();
            return;
        }

    // Siempre mostrar el preview mientras esté en modo construcción
            if (!_toBuild.activeSelf) _toBuild.SetActive(true);

    Vector3 touchWorldPos3D = Camera.main.ScreenToWorldPoint(new Vector3(touch.position.x, touch.position.y, Camera.main.nearClipPlane));
    Vector2 touchWorldPos = new Vector2(touchWorldPos3D.x, touchWorldPos3D.y);

    switch (touch.phase)
    {
        case TouchPhase.Began:
            isDragging = true;
            lastTouchPosition = touchWorldPos;

            Vector2 snappedStartPos = isIsometric 
                ? _ClampToNearestIsometric(touchWorldPos, cellSize)
                : _ClampToNearest(touchWorldPos, cellSize);

                _toBuild.transform.position = new Vector3(snappedStartPos.x, snappedStartPos.y, _toBuild.transform.position.z);
            break;

        case TouchPhase.Moved:
            if (isDragging)
            {
                Vector2 snappedPos = isIsometric 
                    ? _ClampToNearestIsometric(touchWorldPos, cellSize)
                    : _ClampToNearest(touchWorldPos, cellSize);

                _toBuild.transform.position = new Vector3(snappedPos.x, snappedPos.y, _toBuild.transform.position.z);
            }
            break;

        case TouchPhase.Ended:
        case TouchPhase.Canceled:
            isDragging = false;
            break;
    }
    }
}

private void _InstanceBuilding()
{
    if (_toBuild != null)
    {
        BuildingManager m = _toBuild.GetComponent<BuildingManager>();
        if (m.hasValidPlacement)
        {
            m.SetPlacementMode(PlacementMode.Fixed);
            foreach (SpriteRenderer sr in m.spriteRenderers)
            {
                sr.sortingOrder = _CalculateSortingOrder(sr.transform.position);
            }

            _buildingPrefab = null;
            _toBuild = null;
            _EnableGridVisual(false);
            script0UI.OcultarIndicaciones();
            script0UI.BotonesConsOff();
            IsPlacingBuilding = false;
        }
    }
}

private void _CancelBuildingMode()
{
    if (_toBuild != null) Destroy(_toBuild);
    _toBuild = null;
    _buildingPrefab = null;
    _EnableGridVisual(false);
    script0UI.OcultarIndicaciones();
    script0UI.BotonesConsOff();
    IsPlacingBuilding = false;
}

public void InstanceBuilding()
{
    _InstanceBuilding();
}

public void CancelBuilding()
{
    _CancelBuildingMode();
}

protected override void _PrepareBuilding()
{
    base._PrepareBuilding();
    _EnableGridVisual(true);
    scriptGlobalUI.CloseGlobalPanels();
    script0UI.MostrarIndicaciones();

#if UNITY_ANDROID
script0UI.BotonesConsOn();
#endif
IsPlacingBuilding = true;
}

text
private Vector2 _ClampToNearest(Vector2 pos, Vector2 cell)
{
    Vector2 snapped = new Vector2(
        Mathf.Floor(pos.x / cell.x) * cell.x + (cell.x * 0.5f) + gridOffset.x,
        Mathf.Floor(pos.y / cell.y) * cell.y + (cell.y * 0.5f) + gridOffset.y
    );
    return snapped;
}

private Vector2 _ClampToNearestIsometric(Vector2 pos, Vector2 cell)
{
    // Medidas de medio tile
    float halfW = cell.x * 0.5f;
    float halfH = cell.y * 0.5f;

    // Convertir posición mundo a "coordenadas de rejilla"
    float isoX = (pos.x / halfW + pos.y / halfH) * 0.5f;
    float isoY = (pos.y / halfH - pos.x / halfW) * 0.5f;

    // Snap a entero
    int gridX = Mathf.RoundToInt(isoX);
    int gridY = Mathf.RoundToInt(isoY);

    // Volver a convertir a coordenadas mundo
    float worldX = (gridX - gridY) * halfW;
    float worldY = (gridX + gridY) * halfH;

    return new Vector2(worldX + gridOffset.x, worldY + gridOffset.y);
}

private void _EnableGridVisual(bool on)
{
    if (gridRenderer == null) return;
    gridRenderer.gameObject.SetActive(on);
}

private void _UpdateGridVisual()
{
    if (gridRenderer == null) return;
    gridRenderer.sharedMaterial.SetVector("_Cell_Size", new Vector4(cellSize.x, cellSize.y, 0, 0));
}

private int _CalculateSortingOrder(Vector3 position)
{
    return Mathf.RoundToInt(-position.y * 100);
}

private bool IsPointerOverUI(Vector2 screenPos)
{
    PointerEventData data = new PointerEventData(EventSystem.current)
{
    position = screenPos
};
List<RaycastResult> results = new List<RaycastResult>();
EventSystem.current.RaycastAll(data, results);

    foreach (var res in results)
    {
        Transform t = res.gameObject.transform;
        bool isBuildUI = false;

        while (t != null)
        {
            if (t.CompareTag("BuildUI"))
            {
                isBuildUI = true;
                break;
            }
            t = t.parent;
        }

        if (isBuildUI) continue; 
        return true; 
    }
return false;
}

}

ahora mismo, el script cancela el modo construcción si el usuario hace interactua con la UI, excepto si lo hace sobre la BuildUI (botones de construccion). Pero tambien requiero que si el usuario interactua con la BuildUI, el preview del edificio no se coloque donde el usuario hizo tap (osea, donde esta la BuildUI), pero todavia sin cancelar el modo construccion.