mirrored_repositories/OpenWeatherPlus-Flutter/lib
// Copyright 2020 Daniel Dai (danieldai.com, mianjiajia.com)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'package:fish_redux/fish_redux.dart';

import 'action.dart';
import 'location/state.dart';
import 'state.dart';

Reducer<WeatherState> buildReducer() {
  return asReducer(
    <Object, Reducer<WeatherState>>{
      WeatherAction.setActiveIndex: _setActiveIndex,
    },
  );
}

WeatherState _setActiveIndex(WeatherState state, Action action) {
  int index = action.payload ?? 0;

  if(index < 0) return state;

  final WeatherState newState = state.clone();
  // 转到台前的城市要把数据状态这是成待更新
  newState.locationStates[index].updatingStatus = UpdatingStatus.updateNeeded;
  newState.activeIndex = index;
  newState.activeCityId = newState.locationStates[index].id;
  return newState;
}
