import postReducer, {
  PATCH_POST,
  hydrate as hydratePost
} from "misago/reducers/post"

export const APPEND_POSTS = "APPEND_POSTS"
export const SELECT_POST = "SELECT_POST"
export const DESELECT_POST = "DESELECT_POST"
export const DESELECT_POSTS = "DESELECT_POSTS"
export const LOAD_POSTS = "LOAD_POSTS"
export const UNLOAD_POSTS = "UNLOAD_POSTS"
export const UPDATE_POSTS = "UPDATE_POSTS"

export function select(post) {
  return {
    type: SELECT_POST,
    post
  }
}

export function deselect(post) {
  return {
    type: DESELECT_POST,
    post
  }
}

export function deselectAll() {
  return {
    type: DESELECT_POSTS
  }
}

export function hydrate(json) {
  return Object.assign({}, json, {
    results: json.results.map(hydratePost),
    isLoaded: true,
    isBusy: false,
    isSelected: false
  })
}

export function load(newState, hydrated = false) {
  return {
    type: LOAD_POSTS,
    state: hydrated ? newState : hydrate(newState)
  }
}

export function append(newState, hydrated = false) {
  return {
    type: APPEND_POSTS,
    state: hydrated ? newState : hydrate(newState)
  }
}

export function unload() {
  return {
    type: UNLOAD_POSTS
  }
}

export function update(newState) {
  return {
    type: UPDATE_POSTS,
    update: newState
  }
}

export default function posts(state = {}, action = null) {
  switch (action.type) {
    case SELECT_POST:
      const selectedPosts = state.results.map(post => {
        if (post.id == action.post.id) {
          return Object.assign({}, post, {
            isSelected: true
          })
        } else {
          return post
        }
      })

      return Object.assign({}, state, {
        results: selectedPosts
      })

    case DESELECT_POST:
      const deseletedPosts = state.results.map(post => {
        if (post.id == action.post.id) {
          return Object.assign({}, post, {
            isSelected: false
          })
        } else {
          return post
        }
      })

      return Object.assign({}, state, {
        results: deseletedPosts
      })

    case DESELECT_POSTS:
      const deseletedAllPosts = state.results.map(post => {
        return Object.assign({}, post, {
          isSelected: false
        })
      })

      return Object.assign({}, state, {
        results: deseletedAllPosts
      })

    case APPEND_POSTS:
      let results = state.results.slice()
      const resultsIds = state.results.map(post => {
        return post.id
      })

      action.state.results.map(post => {
        if (resultsIds.indexOf(post.id) === -1) {
          results.push(post)
        }
      })

      return Object.assign({}, action.state, {
        results
      })

    case LOAD_POSTS:
      return action.state

    case UNLOAD_POSTS:
      return Object.assign({}, state, {
        isLoaded: false
      })

    case UPDATE_POSTS:
      return Object.assign({}, state, action.update)

    case PATCH_POST:
      const reducedPosts = state.results.map(post => {
        return postReducer(post, action)
      })

      return Object.assign({}, state, {
        results: reducedPosts
      })

    default:
      return state
  }
}