import api, { getLinks } from '../api'
import { fetchRelationships } from './accounts'
import { importFetchedAccounts } from './importer'
import { me } from '../initial_state'

export const BLOCKS_FETCH_REQUEST = 'BLOCKS_FETCH_REQUEST'
export const BLOCKS_FETCH_SUCCESS = 'BLOCKS_FETCH_SUCCESS'
export const BLOCKS_FETCH_FAIL    = 'BLOCKS_FETCH_FAIL'

export const BLOCKS_EXPAND_REQUEST = 'BLOCKS_EXPAND_REQUEST'
export const BLOCKS_EXPAND_SUCCESS = 'BLOCKS_EXPAND_SUCCESS'
export const BLOCKS_EXPAND_FAIL    = 'BLOCKS_EXPAND_FAIL'

export function fetchBlocks() {
  return (dispatch, getState) => {
    if (!me) return

    dispatch(fetchBlocksRequest())

    api(getState).get('/api/v1/blocks').then(response => {
      const next = getLinks(response).refs.find(link => link.rel === 'next')
      dispatch(importFetchedAccounts(response.data))
      dispatch(fetchBlocksSuccess(response.data, next ? next.uri : null))
      dispatch(fetchRelationships(response.data.map(item => item.id)))
    }).catch(error => dispatch(fetchBlocksFail(error)))
  }
}

export function fetchBlocksRequest() {
  return {
    type: BLOCKS_FETCH_REQUEST,
  }
}

export function fetchBlocksSuccess(accounts, next) {
  return {
    type: BLOCKS_FETCH_SUCCESS,
    accounts,
    next,
  }
}

export function fetchBlocksFail(error) {
  return {
    type: BLOCKS_FETCH_FAIL,
    error,
  }
}

export function expandBlocks() {
  return (dispatch, getState) => {
    if (!me) return
    
    const url = getState().getIn(['user_lists', 'blocks', me, 'next'])
    const isLoading = getState().getIn(['user_lists', 'blocks', me, 'isLoading'])

    if (url === null || isLoading) return

    dispatch(expandBlocksRequest())

    api(getState).get(url).then(response => {
      const next = getLinks(response).refs.find(link => link.rel === 'next')
      dispatch(importFetchedAccounts(response.data))
      dispatch(expandBlocksSuccess(response.data, next ? next.uri : null))
      dispatch(fetchRelationships(response.data.map(item => item.id)))
    }).catch(error => dispatch(expandBlocksFail(error)))
  }
}

export function expandBlocksRequest() {
  return {
    type: BLOCKS_EXPAND_REQUEST,
  }
}

export function expandBlocksSuccess(accounts, next) {
  return {
    type: BLOCKS_EXPAND_SUCCESS,
    accounts,
    next,
  }
}

export function expandBlocksFail(error) {
  return {
    type: BLOCKS_EXPAND_FAIL,
    error,
  }
}