const Product = require('../models/product');
const Order = require('../models/order');

exports.getProducts = (req, res, next) => {
  Product.find()
    .then(products => {
      console.log(products);
      res.render('shop/product-list', {
        prods: products,
        pageTitle: 'All Products',
        path: '/products'
      });
    })
    .catch(err => {
      console.log(err);
    });
};

exports.getProduct = (req, res, next) => {
  const prodId = req.params.productId;
  Product.findById(prodId)
    .then(product => {
      res.render('shop/product-detail', {
        product: product,
        pageTitle: product.title,
        path: '/products'
      });
    })
    .catch(err => console.log(err));
};

exports.getIndex = (req, res, next) => {
  Product.find()
    .then(products => {
      res.render('shop/index', {
        prods: products,
        pageTitle: 'Shop',
        path: '/'
      });
    })
    .catch(err => {
      console.log(err);
    });
};

exports.getCart = async (req, res, next) => {
  try {
    // populate() now returns a Promise in Mongoose 6+
    const userPop = await req.user.populate('cart.items.productId');
    // drop any cart‐items whose product was deleted
    const cartItems = userPop.cart.items.filter(item => item.productId);
    const products = cartItems.map(item => ({
      productId: item.productId._id,
      title:     item.productId.title,
      price:     item.productId.price,
      imageUrl:  item.productId.imageUrl,
      quantity:  item.quantity
    }));
    res.render('shop/cart', {
      pageTitle: 'Your Cart',
      path: '/cart',
      products
    });
  } catch (err) {
    next(err);
  }
};

exports.postCart = (req, res, next) => {
  const prodId = req.body.productId;
  Product.findById(prodId)
    .then(product => {
      return req.user.addToCart(product);
    })
    .then(result => {
      console.log(result);
      res.redirect('/cart');
    });
};

exports.postCartDeleteProduct = (req, res, next) => {
  const prodId = req.body.productId;
  req.user
    .removeFromCart(prodId)
    .then(result => {
      res.redirect('/cart');
    })
    .catch(err => console.log(err));
};

exports.postOrder = (req, res, next) => {
  req.user
    .populate('cart.items.productId')
    .execPopulate()
    .then(user => {
      const products = user.cart.items.map(i => {
        return { quantity: i.quantity, product: { ...i.productId._doc } };
      });
      const order = new Order({
        user: {
          name: req.user.name,
          userId: req.user
        },
        products: products
      });
      return order.save();
    })
    .then(result => {
      return req.user.clearCart();
    })
    .then(() => {
      res.redirect('/orders');
    })
    .catch(err => console.log(err));
};

exports.getOrders = (req, res, next) => {
  Order.find({ 'user.userId': req.user._id })
    .then(orders => {
      res.render('shop/orders', {
        path: '/orders',
        pageTitle: 'Your Orders',
        orders: orders
      });
    })
    .catch(err => console.log(err));
};