'use strict';

/**
 * Module dependencies
 */

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

// Local utils.
const actionUtil = require('../actionUtil');
const associationUtil = require('../associationUtil');

/**
 * Create an entry
 */

module.exports = function create(_ctx) {
  const deferred = Promise.defer();

  // Return the model used.
  const Model = actionUtil.parseModel(_ctx);

  // Parse the values of the record to create.
  const values = actionUtil.parseValues(_ctx);

  // Associations validation.
  const associationsValidationPromises = [];

  // Check if the relations are existing for `OneWay` associations.
  _.forEach(_.where(Model.associations, {nature: 'oneWay'}), function (association) {
    if (values[association.alias] || association.required) {
      associationsValidationPromises.push(associationUtil.doesRecordExist(association.model, values[association.alias]));
    }
  });

  // Check if the relations are existing for `OneToOne` associations.
  _.forEach(_.where(Model.associations, {nature: 'oneToOne'}), function (association) {
    if (values[association.alias] || association.required) {
      associationsValidationPromises.push(associationUtil.doesRecordExist(association.model, values[association.alias]));
    }
  });

  Promise.all(associationsValidationPromises)
    .then(function () {
      Model.create(values).exec(function created(err, newInstance) {
        if (err) {
          _ctx.status = 400;
          return deferred.reject(err);
        }

        // Update `oneToOneRelations`.
        const relationPromises = [];

        // Update the `oneToOne` relations.
        _.forEach(_.where(Model.associations, {nature: 'oneToOne'}), function (relation) {
          relationPromises.push(associationUtil.oneToOneRelationUpdated(_ctx.model || _ctx.params.model, newInstance.id, relation.model, newInstance[relation.alias]));
        });

        Promise.all(relationPromises)

          // Related records updated.
          .then(function () {
            let query = Model.findOne(newInstance[Model.primaryKey]);
            query = actionUtil.populateEach(query, _ctx, Model);
            query.exec(function foundAgain(err, populatedRecord) {
              if (err) {
                _ctx.status = 500;
                return deferred.reject(err);
              }

              // Entry created.
              _ctx.status = 201;
              deferred.resolve(populatedRecord);
            });
          })

          // Error during related records update.
          .catch(function (err) {
            _ctx.status = 400;
            deferred.reject(err);
          });
      });
    })

    // Error during related records check.
    .catch(function (err) {
      _ctx.status = 400;
      deferred.reject(err);
    });

  return deferred.promise;
};