match-three/lib/game/components/grid_component.dart

import 'package:flame/components.dart';
import 'package:match_three/bloc/game_bloc.dart';
import 'package:match_three/game/systems/physics_system.dart';
import '../models/grid.dart';
import '../models/gem.dart';
import '../match_three_game.dart';
import 'gem_component.dart';
import '../../utils/constants.dart';

class GridComponent extends PositionComponent
    with HasGameReference<MatchThreeGame> {
  late GameGrid gameGrid;
  final List<List<GemComponent?>> gemComponents = [];
  final MatchThreeGame game;
  int? levelId;
  bool canInterract = false;

  GridComponent(this.game, this.levelId) : super();

  @override
  Future<void> onLoad() async {
    if (levelId == null) {
      game.gameBloc.add(StartGame());
    } else {
      game.gameBloc.add(StartLevel(levelId!));
    }
  }

  void _createGemComponents() {
    // Clear existing components
    for (final row in gemComponents) {
      for (final gemComponent in row) {
        gemComponent?.removeFromParent();
      }
      row.clear();
    }
    gemComponents.clear();
    for (final child in children) {
      if (child is GemComponent) {
        child.removeFromParent();
      }
    }

    for (int row = 0; row < GameConstants.gridHeight; row++) {
      gemComponents.add(<GemComponent?>[]);
      for (int col = 0; col < GameConstants.gridWidth; col++) {
        final gem = gameGrid.getGem(row, col);
        if (gem != null) {
          final gemComponent = GemComponent(gem: gem, gridComponent: this);
          gemComponent.position = Vector2(
            col * GameConstants.gemSize + GameConstants.gridPadding,
            row * GameConstants.gemSize + GameConstants.gridPadding,
          );
          gemComponents[row].add(gemComponent);
          add(gemComponent);
        } else {
          gemComponents[row].add(null);
        }
      }
    }
  }

  void updateGrid(GameState state) async {
    // Work only with relevant events
    if (state is! GamePlaying && state is! GameLevelPlaying) {
      return;
    }
    canInterract = false;
    print("Update event with state ${state.runtimeType.toString()}");

    // Handle regular game states
    if (state is GamePlayingSwap) {
      await _swapGems(
        state.grid,
        state.gem1,
        state.gem2,
      );
    }
    if (state is GameLevelSwap) {
      await _swapGems(
        state.grid,
        state.gem1,
        state.gem2,
      );
    }
    if (state is GamePlayingMatch) {
      await _animateMatch(state.grid, state.matches);
    }
    if (state is GameLevelMatch) {
      await _animateMatch(state.grid, state.matches);
    }
    if (state is GamePlayingDrop) {
      await _animateDrop(state.grid);
    }
    if (state is GameLevelDrop) {
      await _animateDrop(state.grid);
    }
    if (state is GamePlayingNewGems) {
      await _animateNewGemsFall(state.grid, state.gems);
    }
    if (state is GameLevelNewGems) {
      await _animateNewGemsFall(state.grid, state.gems);
    }
    if (state is GamePlayingIdle || state is GameLevelIdle) {
      canInterract = true;
    }
    if (state is GamePlaying) {
      gameGrid = state.grid;
      gameGrid.printGrid();
      _createGemComponents();
      await Future.delayed(const Duration(milliseconds: 100));
      print("Updated state ${state.runtimeType.toString()}");
      state.done();
    } else {
      state = state as GameLevelPlaying;
      gameGrid = state.grid;
      gameGrid.printGrid();
      _createGemComponents();
      await Future.delayed(const Duration(milliseconds: 100));
      print("Updated state ${state.runtimeType.toString()}");
      state.done();
    }
  }

  GemComponent? _findGemComponent(Gem gem) {
    return gemComponents[gem.row][gem.col];
  }

  _swapGems(GameGrid newGrid, Gem gem1, Gem gem2) async {
    final gemComp1 = _findGemComponent(gem1);
    final gemComp2 = _findGemComponent(gem2);

    if (gemComp1 == null || gemComp2 == null) {
      print("!! Gem not found");
      return;
    }

    await PhysicsSystem.animateSwap(gemComp1, gemComp2);
  }

  _animateMatch(GameGrid newGrid, List<Gem> matches, [int combo = 0]) async {
    final effects = <Future>[];
    final toRemove = <GemComponent>[];

    // Animate explosion
    for (final gem in matches) {
      final gemComponent = _findGemComponent(gem);
      if (gemComponent != null) {
        toRemove.add(gemComponent);
        effects.add(gemComponent.animateMatch());
        if (combo > 0) {
          gemComponent.animateCombo();
        }
      }
    }
    await Future.wait(effects);
    for (final gemComponent in toRemove) {
      gemComponent.removeFromParent();
    }
  }

  _animateDrop(GameGrid newGrid) async {
    final effects = <Future>[];

    for (int col = GameConstants.gridWidth - 1; col >= 0; col--) {
      for (int row = GameConstants.gridHeight - 1; row >= 0; row--) {
        final gem = gameGrid.getGem(row, col);

        // if gem is removed - animate fall effect from top
        if (gem == null) {
          int fallToRow = row;
          while (row >= 0) {
            final gemAbove = gameGrid.getGem(row, col);
            final gemComponent = gemComponents[row][col];
            if (gemAbove != null) {
              final targetPosition = Vector2(
                col * GameConstants.gemSize + GameConstants.gridPadding,
                fallToRow * GameConstants.gemSize + GameConstants.gridPadding,
              );
              print(
                  "@@ Fall $row, $col -> $fallToRow, $col ${gemComponent == null ? "NULL" : "OK"}");
              effects.add(gemComponent?.animateFall(targetPosition));
              fallToRow--;
            }
            row--;
          }
        }
      }
    }
    await Future.wait(effects);
  }

  _animateNewGemsFall(GameGrid newGrid, List<Gem> newGems) async {
    final effects = <Future>[];

    for (final gem in newGems) {
      // Create gem component from gem and animate falling effect to proper location
      final gemComponent = GemComponent(gem: gem, gridComponent: this);
      final targetPosition = Vector2(
        gem.col * GameConstants.gemSize + GameConstants.gridPadding,
        gem.row * GameConstants.gemSize + GameConstants.gridPadding,
      );

      gemComponent.position.x = targetPosition.x;
      gemComponent.position.y = -GameConstants.gemSize;
      add(gemComponent);
      effects.add(gemComponent.animateFall(targetPosition));
    }

    await Future.wait(effects);
  }

  void onGemTapped(Gem gem) {
    if (canInterract) {
      game.selectGem(gem);
    }
  }
}