import 'package:flutter_android_app/presentation/home_page/bloc/events.dart';
import 'package:flutter_android_app/presentation/home_page/bloc/state.dart';
import 'package:flutter_android_app/repositories/api_interface.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class HomeBloc extends Bloc<HomeEvent, HomeState> {
  final ApiInterface repo;

  HomeBloc(this.repo) : super(const HomeState()) {
    on<HomeLoadDataEvent>(_onLoadData);
    on<HomeLoadFavouritesDataEvent>(_onLoadFavouritesData);
  }

  Future<void> _onLoadData(HomeLoadDataEvent event, Emitter<HomeState> emit) async {
    const int pageSize = 20;

    if (event.nextPage == null) {
      emit(state.copyWith(
        isLoading: true,
        error: 'NO_ERROR',
      ));
    } else {
      emit(state.copyWith(isPaginationLoading: true));
    }

    String? error;

    final data = await repo.loadData(
      search: event.search,
      page: event.nextPage ?? 1,
      pageSize: pageSize,
      onError: (e) => error = e,
      locale: event.locale,
      currencyId: event.currencyId,
    );

    bool isLastPage = false;
    if (data?.data != null && data!.data!.length < pageSize) {
      isLastPage = true;
    }

    if (event.nextPage != null) {
      data?.data?.insertAll(0, state.data?.data ?? []);
    }

    emit(state.copyWith(
        isLoading: false,
        isPaginationLoading: false,
        data: data,
        error: error,
        isAllPagesLoaded: isLastPage,
    ));
  }

  Future<void> _onLoadFavouritesData(HomeLoadFavouritesDataEvent event, Emitter<HomeState> emit) async {
    const int pageSize = 10;

    if (event.nextPage == null) {
      emit(state.copyWith(
        isLoading: true,
        error: 'NO_ERROR',
      ));
    } else {
      emit(state.copyWith(isPaginationLoading: true));
    }

    String? error;

    final data = await repo.loadDataWithIds(
      ids: event.ids ?? [],
      page: event.nextPage ?? 1,
      pageSize: pageSize,
      onError: (e) => error = e,
      locale: event.locale,
      currencyId: event.currencyId,
    );

    bool isLastPage = false;
    if (data?.data != null && data!.data!.length < pageSize) {
      isLastPage = true;
    }

    if (event.nextPage != null) {
      data?.data?.insertAll(0, state.data?.data ?? []);
    }

    emit(state.copyWith(
      isLoading: false,
      isPaginationLoading: false,
      data: data,
      error: error,
      isAllPagesLoaded: isLastPage,
    ));
  }
}