using UnityEngine;
using System.Collections.Generic;

public enum BlockColor { Red, Blue, Green }
public enum BlockShapeType { TShape, CShape }

public class PuzzleBlock : MonoBehaviour
{
    [field: SerializeField] public BlockColor Color { get; private set; }
    [field: SerializeField] public BlockShapeType ShapeType { get; private set; }

    // 原点(0,0)を基準としたブロックのマス配置データ
    public List<Vector2Int> LocalCells { get; private set; } = new List<Vector2Int>();

    private PuzzleGridBoard currentBoard;
    private bool isGrabbed = false;

    private void Awake()
    {
        InitializeShapeCells();
    }

    private void InitializeShapeCells()
    {
        LocalCells.Clear();

        if (ShapeType == BlockShapeType.TShape)
        {
            LocalCells.Add(new Vector2Int(0, 0));
            LocalCells.Add(new Vector2Int(0, 1));
            LocalCells.Add(new Vector2Int(0, 2));
            LocalCells.Add(new Vector2Int(1, 1));
        }
        else if (ShapeType == BlockShapeType.CShape)
        {
            LocalCells.Add(new Vector2Int(0, 0));
            LocalCells.Add(new Vector2Int(1, 0));
            LocalCells.Add(new Vector2Int(0, 1));
            LocalCells.Add(new Vector2Int(0, 2));
            LocalCells.Add(new Vector2Int(1, 2));
        }
    }

    public List<Vector2Int> GetRotatedCells()
    {
        List<Vector2Int> rotated = new List<Vector2Int>();
        // 現在のY回転を90度単位に丸める (0, 1, 2, 3)
        int steps = Mathf.RoundToInt(transform.eulerAngles.y / 90f) % 4;
        if (steps < 0) steps += 4;

        foreach (var cell in LocalCells)
        {
            Vector2Int c = cell;
            for (int i = 0; i < steps; i++)
            {
                // 時計回りに90度回転: (x, y) -> (y, -x)
                c = new Vector2Int(c.y, -c.x);
            }
            rotated.Add(c);
        }
        return rotated;
    }

    public void OnGrabbed()
    {
        isGrabbed = true;
        if (currentBoard != null)
        {
            currentBoard.RemoveBlock(this);
            currentBoard = null;
        }
    }

    // PuzzleBlock.cs 内に以下を追加・修正
    private PuzzleGridBoard overlappingBoard;

    private void OnTriggerEnter(Collider other)
    {
        var board = other.GetComponentInParent<PuzzleGridBoard>();
        if (board != null) overlappingBoard = board;
    }

    private void OnTriggerExit(Collider other)
    {
        var board = other.GetComponentInParent<PuzzleGridBoard>();
        if (board == overlappingBoard) overlappingBoard = null;
    }

    // 引数なしで呼べるように変更
    public void OnReleased()
    {
        isGrabbed = false;

        // 1. 手の傾きを最も近い90度単位にスナップ補正
        Vector3 currentEuler = transform.eulerAngles;
        float snappedY = Mathf.Round(currentEuler.y / 90f) * 90f;
        transform.rotation = Quaternion.Euler(0f, snappedY, 0f);

        // 2. 近くにある盤面へのセットを試みる
        if (overlappingBoard != null && overlappingBoard.TryPlaceBlock(this))
        {
            currentBoard = overlappingBoard;
        }
    }
}