// @flow

import * as ACTIONS from 'constants/action_types';
import { handleActions } from 'util/redux-utils';

const defaultState: LivestreamState = {
  fetchingById: {},
  viewersById: {},
  fetchingActiveLivestreams: 'pending',
  activeLivestreams: null,
  activeLivestreamsLastFetchedDate: 0,
  activeLivestreamsLastFetchedOptions: {},
  activeLivestreamInitialized: false,
  commentSocketConnected: false,
};

function updateViewersById(activeLivestreams, originalState) {
  if (activeLivestreams) {
    const viewersById = Object.assign({}, originalState);
    Object.values(activeLivestreams).forEach((data) => {
      // $FlowFixMe: mixed
      if (data.claimId && data.viewCount) {
        // $FlowFixMe: mixed
        viewersById[data.claimId] = data.viewCount;
      }
    });
    return viewersById;
  }

  return originalState;
}

export default handleActions(
  {
    [ACTIONS.FETCH_NO_SOURCE_CLAIMS_STARTED]: (state: LivestreamState, action: any): LivestreamState => {
      const claimId = action.data;
      const newIdsFetching = Object.assign({}, state.fetchingById);
      newIdsFetching[claimId] = true;

      return { ...state, fetchingById: newIdsFetching };
    },
    [ACTIONS.FETCH_NO_SOURCE_CLAIMS_COMPLETED]: (state: LivestreamState, action: any): LivestreamState => {
      const claimId = action.data;
      const newIdsFetching = Object.assign({}, state.fetchingById);
      newIdsFetching[claimId] = false;

      return { ...state, fetchingById: newIdsFetching };
    },
    [ACTIONS.FETCH_NO_SOURCE_CLAIMS_FAILED]: (state: LivestreamState, action: any) => {
      const claimId = action.data;
      const newIdsFetching = Object.assign({}, state.fetchingById);
      newIdsFetching[claimId] = false;

      return { ...state, fetchingById: newIdsFetching };
    },
    [ACTIONS.VIEWERS_RECEIVED]: (state: LivestreamState, action: any) => {
      const { connected, claimId } = action.data;
      const newViewersById = Object.assign({}, state.viewersById);
      newViewersById[claimId] = connected;
      return { ...state, viewersById: newViewersById };
    },
    [ACTIONS.FETCH_ACTIVE_LIVESTREAMS_STARTED]: (state: LivestreamState) => {
      return { ...state, fetchingActiveLivestreams: true };
    },
    [ACTIONS.FETCH_ACTIVE_LIVESTREAMS_FAILED]: (state: LivestreamState) => {
      return { ...state, fetchingActiveLivestreams: false };
    },
    [ACTIONS.FETCH_ACTIVE_LIVESTREAMS_COMPLETED]: (state: LivestreamState, action: any) => {
      const { activeLivestreams, activeLivestreamsLastFetchedDate, activeLivestreamsLastFetchedOptions } = action.data;
      return {
        ...state,
        fetchingActiveLivestreams: false,
        activeLivestreams,
        activeLivestreamsLastFetchedDate,
        activeLivestreamsLastFetchedOptions,
        viewersById: updateViewersById(activeLivestreams, state.viewersById),
      };
    },
    [ACTIONS.ADD_CHANNEL_TO_ACTIVE_LIVESTREAMS]: (state: LivestreamState, action: any) => {
      const activeLivestreams = Object.assign({}, state.activeLivestreams || {}, action.data);
      return {
        ...state,
        activeLivestreams,
        activeLivestreamInitialized: true,
        viewersById: updateViewersById(activeLivestreams, state.viewersById),
      };
    },
    [ACTIONS.REMOVE_CHANNEL_FROM_ACTIVE_LIVESTREAMS]: (state: LivestreamState, action: any) => {
      const activeLivestreams = state.activeLivestreams;
      if (activeLivestreams) delete activeLivestreams[action.data.channelId];
      return { ...state, activeLivestreams: Object.assign({}, activeLivestreams), activeLivestreamInitialized: true };
    },
    [ACTIONS.COMMENT_SOCKET_CONNECTED]: (state: CommentsState, action: any) => ({
      ...state,
      commentSocketConnected: action.data.connected,
    }),
  },
  defaultState
);