import 'dart:async';

import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:pmu/data/repositories/api_repository.dart';
import 'package:pmu/presentation/home_page/bloc/events.dart';
import 'package:pmu/presentation/home_page/bloc/state.dart';

class HomeBloc extends Bloc<HomeEvent, HomeState> {
  final ApiRepository repository;

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

  Future<void> _onLoadData(
      HomeLoadDataEvent event, Emitter<HomeState> emit) async {

    if (event.pageNumber == event.lastPageNumber && event.pageNumber != null) {
      emit(state.copyWith(
        isLoading: false,
        isPaginationLoading: false,
      ));
      return;
    }

    if (event.nextPageNumber == null) {
      emit(state.copyWith(isLoading: true));
    } else {
      emit(state.copyWith(isPaginationLoading: true));
    }

    String? error;

    final data = await repository.loadData(
      q: event.search,
      pageNumber: event.nextPageNumber ?? 0,
      onError: (e) => error = e,
    );

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

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