match-three/lib/game/models/grid.dart

import 'dart:math';
import 'gem.dart';
import '../../utils/constants.dart';

class GameGrid {
  late List<List<Gem?>> _grid;
  final Random _random = Random();
  final int width;
  final int height;

  GameGrid({required this.width, required this.height}) {
    _initializeGrid();
  }

  void _initializeGrid() {
    _grid = List.generate(
      height,
      (row) => List.generate(
        width,
        (col) => Gem(
          type: _random.nextInt(GameConstants.gemTypes.length),
          row: row,
          col: col,
        ),
      ),
    );
  }

  Gem? getGem(int row, int col) {
    if (row < 0 || row >= height || col < 0 || col >= width) {
      return null;
    }
    return _grid[row][col];
  }

  void setGem(int row, int col, Gem? gem) {
    if (row >= 0 && row < height && col >= 0 && col < width) {
      _grid[row][col] = gem;
    }
  }

  List<List<Gem?>> get grid => _grid;

  bool isValidPosition(int row, int col) {
    return row >= 0 && row < height && col >= 0 && col < width;
  }

  clone() {
    final clonedGrid = GameGrid(width: width, height: height);
    for (int row = 0; row < _grid.length; row++) {
      for (int col = 0; col < _grid[row].length; col++) {
        final gem = getGem(row, col);

        clonedGrid.setGem(row, col, gem?.copyWith());
      }
    }
    return clonedGrid;
  }

  void printGrid() {
    final cols = _grid[0].length;
    var colHeader = "    |";
    for (int col = 0; col < cols; col++) {
      colHeader += " ${col.toString().padRight(3, " ")} |";
    }
    colHeader += "\n--- |";
    for (int col = 0; col < cols; col++) {
      colHeader += " --- |";
    }
    print(colHeader);
    for (int row = 0; row < _grid.length; row++) {
      var rowStr = "";
      for (int col = 0; col < cols; col++) {
        final gem = getGem(row, col);
        if (col == 0) rowStr += "${row.toString().padLeft(3, " ")} |";
        rowStr += " ${(gem?.type.toString() ?? "-").padLeft(3, " ")} |";
      }
      print(rowStr);
    }
    print("");
  }
}