import { ServiceBase } from 'wdk-client/Service/ServiceBase';
import {
    RecordInstance,
    Favorite,
    PrimaryKey,
} from 'wdk-client/Utils/WdkModel';


export default (base: ServiceBase) => {

  /**
   * Gets favorite ID of a single record, or undefined if record is not a
   * favorite of the current user.  Thus can be used to check whether a record
   * is a favorite of the current user.
   *
   * @param record Record instance to search for
   */
  async function getFavoriteId (recordId: PrimaryKey, recordClassUrlSegment: string) {
    let data = [{
      recordClassName: recordClassUrlSegment,
      primaryKey: recordId
    }];
    let url = '/users/current/favorites/query';
    return base
      ._fetchJson<Array<number>>('post', url, JSON.stringify(data))
      .then(data => data.length ? data[0] : undefined);
  }

  /**
   * Adds the passed record as a favorite of the current user and returns ID
   * of the new favorite.
   *
   * @param record Record to add as a favorite
   */
  async function addFavorite (recordId: PrimaryKey, recordClassUrlSegment: string) {
    const favorite = { recordClassName: recordClassUrlSegment, primaryKey: recordId };
    const url = '/users/current/favorites';
    return base
      ._fetchJson<Favorite>('post', url, JSON.stringify(favorite))
      .then(data => data.id);
  }

  /**
   * Deletes the favorite with the passed ID and returns a promise with the
   * "new ID" i.e. undefined since favorite no longer exists
   *
   * @param id id of favorite to delete
   */
  function deleteFavorite (id: number) {
    let url = '/users/current/favorites/' + id;
    return base
      ._fetchJson<void>('delete', url)
      .then(() => undefined);
  }

  /**
   * Returns an array of the current user's favorites
   */
  function getCurrentFavorites () {
    return base._fetchJson<Favorite[]>('get', '/users/current/favorites');
  }

  /**
   * Saves the note and group on the passed favorite to the server
   *
   * @param favorite
   */
  function saveFavorite (favorite: Favorite) {
    let url = '/users/current/favorites/' + favorite.id;
    favorite.group = favorite.group ? favorite.group : '';
    favorite.description = favorite.description ? favorite.description : '';
    return base._fetchJson<void>('patch', url, JSON.stringify(favorite));
  }

  function deleteFavorites (ids: Array<number>) {
    return runBulkFavoritesAction('delete', ids);
  }

  function undeleteFavorites (ids: Array<number>) {
    return runBulkFavoritesAction('undelete', ids);
  }

  function runBulkFavoritesAction (operation: 'delete' | 'undelete', ids: Array<number>) {
    let url = '/users/current/favorites';
    let data = { action: operation, primaryKeys: ids };
    return base._fetchJson<void>('patch', url, JSON.stringify(data));
  }

  return {
    getFavoriteId,
    addFavorite,
    deleteFavorite,
    deleteFavorites,
    getCurrentFavorites,
    saveFavorite,
    undeleteFavorites
  }
}