const mongoose = require('mongoose');
const config = require('../config/mongodb');
const log = require('../libs/log')(module);
mongoose.connect(config.database);

var Schema = mongoose.Schema;

var RefSchema = new Schema({
  _id: {type: String, default: 'refs'},
  ref: {type: Number, default: 776}
});

RefSchema.statics.increment = function (callback) {
  var query = {_id: 'refs'};
  var update = {$inc: {ref: 1}};
  var options = {upsert: true, 'new': true, setDefaultsOnInsert: true};

  this.findOneAndUpdate(query, update, options, callback);
};


var RefModel = mongoose.model('Ref', RefSchema);

var OrderSchema = new Schema({
  total: Number,
  ref: Number
});

OrderSchema.pre('save', function (next) {
  if (!this.isNew) {
    return next();
  }

  var self = this;
  RefModel.increment(function (err, doc) {
    self.ref = doc.ref;
    next(err);
  });
});

var OrderModel = mongoose.model('Order', OrderSchema);

var orders = [];

for (var i = 0; i < 100; i++) {
  orders.push({total: (i + 1) * 3.4});
}

OrderModel.create(orders, function (err, orders) {
  console.log('orders', orders);
});

var OrderModel = mongoose.model('Order', OrderModel)