import { Map, List, fromJS } from 'immutable';
import { EDITORIAL_WORKFLOW } from '../constants/publishModes';
import {
  UNPUBLISHED_ENTRY_REQUEST,
  UNPUBLISHED_ENTRY_REDIRECT,
  UNPUBLISHED_ENTRY_SUCCESS,
  UNPUBLISHED_ENTRIES_REQUEST,
  UNPUBLISHED_ENTRIES_SUCCESS,
  UNPUBLISHED_ENTRY_PERSIST_REQUEST,
  UNPUBLISHED_ENTRY_PERSIST_SUCCESS,
  UNPUBLISHED_ENTRY_STATUS_CHANGE_REQUEST,
  UNPUBLISHED_ENTRY_STATUS_CHANGE_SUCCESS,
  UNPUBLISHED_ENTRY_PUBLISH_REQUEST,
} from '../actions/editorialWorkflow';
import { CONFIG_SUCCESS } from '../actions/config';

const unpublishedEntries = (state = null, action) => {
  const publishMode = action.payload && action.payload.publish_mode;
  switch (action.type) {
    case CONFIG_SUCCESS:
      if (publishMode === EDITORIAL_WORKFLOW) {
        //  Editorial workflow state is explicetelly initiated after the config.
        return Map({ entities: Map(), pages: Map() });
      }
      return state;
    case UNPUBLISHED_ENTRY_REQUEST:
      return state.setIn(['entities', `${ action.payload.collection }.${ action.payload.slug }`, 'isFetching'], true);
    
    case UNPUBLISHED_ENTRY_REDIRECT:
      return state.deleteIn(['entities', `${ action.payload.collection }.${ action.payload.slug }`]);

    case UNPUBLISHED_ENTRY_SUCCESS:
      return state.setIn(
        ['entities', `${ action.payload.collection }.${ action.payload.entry.slug }`],
        fromJS(action.payload.entry)
      );

    case UNPUBLISHED_ENTRIES_REQUEST:
      return state.setIn(['pages', 'isFetching'], true);

    case UNPUBLISHED_ENTRIES_SUCCESS:
      return state.withMutations((map) => {
        action.payload.entries.forEach(entry => (
          map.setIn(['entities', `${ entry.collection }.${ entry.slug }`], fromJS(entry).set('isFetching', false))
        ));
        map.set('pages', Map({
          ...action.payload.pages,
          ids: List(action.payload.entries.map(entry => entry.slug)),
        }));
      });

    case UNPUBLISHED_ENTRY_PERSIST_REQUEST:
      // Update Optimistically
      return state.withMutations((map) => {
        map.setIn(['entities', `${ action.payload.collection }.${ action.payload.entry.get('slug') }`], fromJS(action.payload.entry));
        map.setIn(['entities', `${ action.payload.collection }.${ action.payload.entry.get('slug') }`, 'isPersisting'], true);
        map.updateIn(['pages', 'ids'], List(), list => list.push(action.payload.entry.get('slug')));
      });

    case UNPUBLISHED_ENTRY_PERSIST_SUCCESS:
      // Update Optimistically
      return state.deleteIn(['entities', `${ action.payload.collection }.${ action.payload.entry.get('slug') }`, 'isPersisting']);

    case UNPUBLISHED_ENTRY_STATUS_CHANGE_REQUEST:
      // Update Optimistically
      return state.withMutations((map) => {
        map.setIn(['entities', `${ action.payload.collection }.${ action.payload.slug }`, 'metaData', 'status'], action.payload.newStatus);
        map.setIn(['entities', `${ action.payload.collection }.${ action.payload.slug }`, 'isPersisting'], true);
      });

    case UNPUBLISHED_ENTRY_STATUS_CHANGE_SUCCESS:
      // Update Optimistically
      return state.deleteIn(['entities', `${ action.payload.collection }.${ action.payload.slug }`, 'isPersisting']);

    case UNPUBLISHED_ENTRY_PUBLISH_REQUEST:
      // Update Optimistically
      return state.deleteIn(['entities', `${ action.payload.collection }.${ action.payload.slug }`]);

    default:
      return state;
  }
};

export const selectUnpublishedEntry = (state, collection, slug) => state && state.getIn(['entities', `${ collection }.${ slug }`]);

export const selectUnpublishedEntriesByStatus = (state, status) => {
  if (!state) return null;
  return state.get('entities').filter(entry => entry.getIn(['metaData', 'status']) === status).valueSeq();
};


export default unpublishedEntries;