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import { feedActionTypes } from './feed.types'
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const initialState = {
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  feeds: {
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    byId: {},
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    allIds: []
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  },
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  timelineUrl: '',
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  currentFeed: null,
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  loading: false,
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  currentPage: 1,
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  pages: 1
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}
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const feedReducer = (state = initialState, { type, payload }) => {
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  switch (type) {
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    case feedActionTypes.SET_TIMELINE_URL: {
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      const newTimelineUrl = payload
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      return { ...state, timelineUrl: newTimelineUrl }
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    }
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    case feedActionTypes.LOAD_FEEDS: {
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      return { ...state, loading: true }
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    }
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    case feedActionTypes.LOAD_FEEDS_SUCCESS: {
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      const { feeds, currentPage, pages } = payload
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      const feedsById = {}
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      feeds.forEach((feed) => {
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        feedsById[feed.feed_unique] = {
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          ...feed,
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          comments: feed.comments.map((comment) => ({
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            ...comment,
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            feedId: feed.feed_unique
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          }))
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        }
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      })
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      const feedsIds = feeds.map((feed) => feed.feed_unique)
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      return {
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        ...state,
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        feeds: { byId: feedsById, allIds: feedsIds },
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        currentPage,
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        pages,
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        loading: false
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      }
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    }
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    case feedActionTypes.REMOVE_COMMENT: {
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      const { feedId, commentId } = payload
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      const feed = state.feeds.byId[feedId]
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      return {
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        ...state,
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        feeds: {
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          ...state.feeds,
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          byId: {
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            ...state.feeds.byId,
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            [feedId]: {
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              ...feed,
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              comments: feed.comments.filter(
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                ({ unique }) => unique !== commentId
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              ),
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              owner_comments: feed.owner_comments - 1
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            }
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          }
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        }
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      }
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    }
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    case feedActionTypes.ADD_COMMENT: {
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      const { feedId, comment } = payload
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      const feed = state.feeds.byId[feedId]
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      return {
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        ...state,
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        feeds: {
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          ...state.feeds,
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          byId: {
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            ...state.feeds.byId,
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            [feedId]: {
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              ...feed,
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              owner_comments: feed.owner_comments + 1,
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              comments: [...feed.comments, { ...comment, feedId }]
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            }
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          }
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        }
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      }
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    }
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    case feedActionTypes.LOAD_FEEDS_FAILURE: {
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      return state
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    }
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    case feedActionTypes.ADD_FEED: {
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      const { feedSharedId, feed } = payload
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      const isShare = state.feeds.allIds.some((id) => id === feedSharedId)
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      if (isShare) {
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        const feedShared = state.feeds.byId[feedSharedId]
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        feedShared.owner_comments = feedShared.owner_comments + 1
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        return {
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          ...state,
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          feeds: {
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            byId: {
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              ...state.feeds.byId,
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              [feed.feed_unique]: feed,
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              [feedSharedId]: feedShared
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            },
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            allIds: [feed.feed_unique, ...state.feeds.allIds]
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          }
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        }
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      }
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      return {
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        ...state,
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        feeds: {
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          byId: { ...state.feeds.byId, [feed.feed_unique]: feed },
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          allIds: [feed.feed_unique, ...state.feeds.allIds]
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        }
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      }
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    }
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    case feedActionTypes.UPDATE_FEED: {
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      const { feed, uuid } = payload
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      return {
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        ...state,
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        feeds: {
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          ...state.feeds,
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          byId: {
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            ...state.feeds.byId,
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            [uuid]: { ...state.feeds.byId[uuid], feed }
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          }
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        }
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      }
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    }
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    case feedActionTypes.DELETE_FEED: {
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      const feedId = payload
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      const newIds = state.feeds.allIds.filter((id) => id !== feedId)
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      const newFeeds = { ...state.feeds.byId, [feedId]: null }
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      return {
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        ...state,
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        feeds: {
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          ...state.feeds,
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          byId: newFeeds,
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          allIds: newIds
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        }
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      }
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    }
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    case feedActionTypes.ADD_CURRENT_FEED: {
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      return { ...state, currentFeed: payload }
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    }
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    case feedActionTypes.SET_CURRENT_PAGE: {
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      const newCurrentPage = payload
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      return { ...state, currentPage: newCurrentPage }
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    }
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    default:
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      return state
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  }
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}
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export default feedReducer