import 'dart:math' as math;
import 'package:bloc/bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:meta/meta.dart';

part 'game_event.dart';
part 'game_state.dart';

class GameBloc extends Bloc<GameEvent, GameState> {
  GameBloc() : super(const GameState.initial()) {
    on<RoundLost>(_onRoundLost);
    on<Scored>(_onScored);
    on<MultiplierIncreased>(_onIncreasedMultiplier);
    on<BonusActivated>(_onBonusActivated);
    on<GameOver>(_onGameOver);
    on<GameStarted>(_onGameStarted);
  }

  static const _maxScore = 9999999999;

  void _onGameStarted(GameStarted _, Emitter emit) {
    emit(const GameState.initial().copyWith(status: GameStatus.playing));
  }

  void _onGameOver(GameOver _, Emitter emit) {
    emit(state.copyWith(status: GameStatus.gameOver));
  }

  void _onRoundLost(RoundLost event, Emitter emit) {
    final score = math.min(
      state.totalScore + state.roundScore * state.multiplier,
      _maxScore,
    );
    final roundsLeft = math.max(state.rounds - 1, 0);

    emit(
      state.copyWith(
        totalScore: score,
        roundScore: 0,
        multiplier: 1,
        rounds: roundsLeft,
        status: roundsLeft == 0 ? GameStatus.gameOver : state.status,
      ),
    );
  }

  void _onScored(Scored event, Emitter emit) {
    if (state.status.isPlaying) {
      final combinedScore = math.min(
        state.totalScore + state.roundScore + event.points,
        _maxScore,
      );
      emit(state.copyWith(roundScore: combinedScore - state.totalScore));
    }
  }

  void _onIncreasedMultiplier(MultiplierIncreased event, Emitter emit) {
    if (state.status.isPlaying) {
      emit(
        state.copyWith(
          multiplier: math.min(state.multiplier + 1, 6),
        ),
      );
    }
  }

  void _onBonusActivated(BonusActivated event, Emitter emit) {
    emit(
      state.copyWith(
        bonusHistory: [...state.bonusHistory, event.bonus],
      ),
    );
  }
}