using UnityEngine;

public class DraggableBlock : MonoBehaviour
{
    private bool isDragging = false;
    private Vector2 startPosition;
    private GridManager gridManager;

    private void Start()
    {
        gridManager = FindObjectOfType<GridManager>();

        if (gridManager == null)
        {
            Debug.LogError("❌ GridManager NOT found in the scene! Make sure GridManager exists.");
        }
    }

    private void OnMouseDown()
    {
        startPosition = transform.position; // Store the original position
        isDragging = true;
    }

    private void OnMouseDrag()
    {
        if (!isDragging) return;

        Vector2 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        transform.position = mousePosition; // Move block with the mouse
    }

    private void OnMouseUp()
    {
        isDragging = false;

        if (gridManager == null)
        {
            Debug.LogError("❌ GridManager reference is missing!");
            return;
        }

        Vector2 snappedPosition = gridManager.SnapToGrid(transform.position);

        if (gridManager.IsCellEmpty(snappedPosition))
        {
            transform.position = snappedPosition;
            gridManager.PlaceBlock(snappedPosition, transform);
            Debug.Log($"✅ Block successfully placed at: {snappedPosition}");
        }
        else
        {
            Debug.LogWarning("⚠️ Invalid Placement: Returning to start position.");
            transform.position = startPosition;
        }
    }
}