import 'dart:async';

import 'package:bloc/bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:gitea_client/model/pull.dart';
import 'package:stream_transform/stream_transform.dart';

import '../service/gitea_service.dart';

part 'pulls_event.dart';
part 'pulls_state.dart';

class PullRequestBloc extends Bloc<PullRequestEvent, PullRequestState> {
  final GiteaService giteaService;
  final String istate;
  final String repoFullName;
  PullRequestBloc(this.giteaService,this.repoFullName,this.istate) : super(const PullRequestState()) {
    on<PullRequestsFetched>(_onIssuesFetched,
      transformer: (events, mapper) => events.switchMap(mapper),);
  }

  Future<void> _onIssuesFetched(PullRequestsFetched event, Emitter<PullRequestState> emit) async {
    if (state.hasReachedMax) return;
    try {
      if (state.status == PullRequestStatus.initial) {
        final pulls = await giteaService.getRepoPulls(owner: repoFullName.split('/')[0],repo: repoFullName.split('/')[1],state: istate,page: 1, limit: 10);
        return emit(state.copyWith(
          status: PullRequestStatus.success,
          pulls: pulls,
          loadedPages: 1,
          hasReachedMax: false,
          error_message: null,
        ));
      }
      final pulls = await giteaService.getRepoPulls(owner: repoFullName.split('/')[0],repo: repoFullName.split('/')[1],state: istate,page: state.loadedPages+1, limit: 10);
      final prList = List.of(state.pulls);
      pulls.forEach((element) {
        if(prList.where((selement) => selement.id == element.id).isEmpty) {
          prList.add(element);
        }
      });
      emit(pulls.isEmpty
          ? state.copyWith(hasReachedMax: true)
          : state.copyWith(
        status: PullRequestStatus.success,
        pulls: prList,
        loadedPages: state.loadedPages+1,
        hasReachedMax: false,
        error_message: null,
      ));
    } on Exception catch (e) {
      emit(state.copyWith(status: PullRequestStatus.failure,error_message: e.toString()));
    }
  }
}