'use strict';

/**
 * Module dependencies
 */

// Public node modules.
const _ = require('lodash');

/**
 * Utils functions for BookShelf
 */

module.exports = {

  /**
   * Find primary key
   */

  getPK: function (collectionIdentity, collection, models) {

    // This is not a Bookshelf collection, only the name.
    if (_.isString(collectionIdentity) && !_.isUndefined(models)) {
      const PK = _.findKey(_.get(models, collectionIdentity + '.attributes'), function(o) {
        return o.hasOwnProperty('primary');
      });

      if (!_.isEmpty(PK)) {
        return PK;
      }
    }

    // Collection undefined try to get the collection based on collectionIdentity
    if (_.isUndefined(collection)) {
      collection = _.get(strapi.bookshelf.collections, collectionIdentity);
    }

    // Impossible to match collectionIdentity before, try to use idAttribute
    if (_.isObject(collection)) {
      return collection.forge().idAttribute || 'id';
    }

    return 'id';
  },

  /**
   * Find primary key
   */

  getCount: function (type) {
    return strapi.bookshelf.collections[type].forge().count().then(function (count) {
      return count;
    });
  }
}