const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const CartSchema = new Schema({
  userId: { type: Schema.Types.ObjectId, ref: 'User' },
  totalQty: { type: Number, default: 0 },
  totalPrice: { type: Number, default: 0 },
  items: [{
    item: { type: Schema.Types.ObjectId, ref: 'Product' },
    quantity: { type: Number, default: 1 },
    price: { type: Number, default: 0 }
  }]
});

module.exports.getCartByUserId = function (uid, callback) {
  let query = { userId: uid }
  Cart.find(query, callback)
}

module.exports.getCartById = function (id, callback) {
  Cart.findById(id, callback)
}

module.exports.updateCartByUserId = function (userId, newCart, callback) {
  let query = { userId: userId }
  Cart.find(query, function (err, c) {
    if (err) throw err

    //exist cart in databse
    if (c.length > 0) {
      Cart.findOneAndUpdate(
        { userId: userId },
        {
          $set: {
            items: newCart.items,
            totalQty: newCart.totalQty,
            totalPrice: newCart.totalPrice,
            userId: userId
          }
        },
        { new: true },
        callback
      )
    } else {
      //no cart in database
      newCart.save(callback)
    }
  })
}

module.exports.updateCartByCartId = function (cartId, newCart, callback) {
  Cart.findById(
    { _id: cartId },
    {
      $set: newCart
    },
    callback
  )
}



module.exports.createCart = function (newCart, callback) {
  newCart.save(callback)
}

module.exports = mongoose.model('Cart', CartSchema);