import 'dart:async';

import 'package:bloc/bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:farm_tpf/data/api/app_exception.dart';
import 'package:farm_tpf/data/repository/repository.dart';
import 'package:meta/meta.dart';

part 'plot_parameter_event.dart';
part 'plot_parameter_state.dart';

class PlotParameterBloc extends Bloc<PlotParameterEvent, PlotParameterState> {
  final Repository repository;
  PlotParameterBloc({@required this.repository})
      : super(PlotParameterInitial());
  static int pageSize = 20;

  @override
  Stream<PlotParameterState> mapEventToState(
    PlotParameterEvent event,
  ) async* {
    if (event is DataFetched &&
        !(state is PlotParameterSuccess &&
            (state as PlotParameterSuccess).hasReachedMax)) {
      try {
        if (state is PlotParameterInitial) {
          yield PlotParameterLoading();
          final response = await repository.getEnvironmentParameters(
              cropId: event.cropId, page: 0, size: pageSize);
          yield PlotParameterSuccess(
              items: response,
              page: 0,
              hasReachedMax: response.length < pageSize ? true : false);
        }
        //TODO: check paging api
        // if (state is PlotParameterSuccess) {
        //   final currentState = state as PlotParameterSuccess;
        //   int page = currentState.page + 1;
        //   final response = await repository.getEnvironmentParameters(
        //       cropId: event.cropId, page: page, size: pageSize);
        //   yield response.isEmpty
        //       ? currentState.copyWith(hasReachedMax: true)
        //       : PlotParameterSuccess(
        //           items: currentState.items + response,
        //           page: currentState.page + 1,
        //           hasReachedMax: false);
        // }
      } catch (e) {
        var errorString = AppException.handleError(e);
        yield PlotParameterFailure(errorString: errorString);
      }
    }
    if (event is OnRefresh) {
      try {
        yield PlotParameterLoading();
        final response = await repository.getEnvironmentParameters(
            cropId: event.cropId, page: 0, size: pageSize);
        yield PlotParameterSuccess(
            items: response,
            page: 0,
            hasReachedMax: response.length < pageSize ? true : false);
      } catch (e) {
        yield PlotParameterFailure(errorString: AppException.handleError(e));
      }
    }
  }
}