import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:mchess/utils/chess_utils.dart';

class PromotionUiBloc extends Bloc<PromotionEvent, PromotionUiState> {
  static final PromotionUiBloc _instance = PromotionUiBloc._internal();

  PromotionUiBloc._internal() : super(PromotionUiState.init()) {
    on<PawnMovedToPromotionField>(promotionMoveHandler);
  }

  void promotionMoveHandler(
    PawnMovedToPromotionField event,
    Emitter<PromotionUiState> emit,
  ) {
    emit(PromotionUiState(
        showPromotionDialog: true, colorMoved: event.colorMoved));
  }

  factory PromotionUiBloc.getInstance() {
    return PromotionUiBloc();
  }

  factory PromotionUiBloc() {
    return _instance;
  }
}

abstract class PromotionEvent {}

class PawnMovedToPromotionField extends PromotionEvent {
  final ChessCoordinate endSquare;
  final ChessColor colorMoved;

  PawnMovedToPromotionField(
      {required this.endSquare, required this.colorMoved});
}

class PromotionUiState {
  final bool showPromotionDialog;
  final ChessColor colorMoved;

  PromotionUiState(
      {required this.showPromotionDialog, required this.colorMoved});

  factory PromotionUiState.init() {
    return PromotionUiState(
        showPromotionDialog: false, colorMoved: ChessColor.white);
  }
}