import 'package:flutter/material.dart';
import 'board.dart';
import 'tile.dart';

class SwapNotifier extends ChangeNotifier {
  Tile? selectedTile;

  void selectTile(Tile tile, Board board) {
    if (selectedTile == null) {
      selectedTile = tile;
      tile.select();
    } else {
      if (_isNeighbor(selectedTile!, tile)) {
        board.swapTiles(selectedTile!, tile, true);
        Future.delayed(const Duration(milliseconds: 300), () {
          if (!board.checkMatches()) {
            board.swapTiles(tile, selectedTile!, true);
          }
          selectedTile = null;
        });
      } else {
        selectedTile?.deselect();
        selectedTile = tile;
        tile.select();
      }
    }
    notifyListeners();
  }

  bool _isNeighbor(Tile tile1, Tile tile2) {
    return (tile1.row == tile2.row && (tile1.col - tile2.col).abs() == 1) ||
        (tile1.col == tile2.col && (tile1.row - tile2.row).abs() == 1);
  }
}