const Cart_Item = require('../models/user/Cart_item')
const Order = require('../models/user/Order')
const User = require('../models/user/User')
const localeController = require('./localeController')
const Product = require('../models/product/Product')
const {body, validationResult} = require('express-validator')
const dateformat = require('dateformat')
const v_m = require('../validation_messages')

////////////////////////////////////// cart
module.exports.addToCart = [
   [
      body('user_id')
         .custom((value, {req}) => {
            return User.findById(value)
               .then(user => {
                  if (user) return true
               })
               .catch(err => {
                  return Promise.reject(v_m[req.body.locale].not_found.user_id)
               })
         }),

      body('product_id')
         .custom((value, {req}) => {
            return Product.findById(value)
               .then(product => {
                  if (product) return true
               })
               .catch(err => {
                  return Promise.reject(v_m[req.body.locale].not_found.item_id)
               })
         }),
      body('quantity')
         .notEmpty()
         .withMessage((value, {req}) => {
            return v_m[req.body.locale].required.quantity
         })
         .bail()
         .isNumeric()
         .withMessage((value, {req}) => {
            return v_m[req.body.locale].format.number
         })
   ],
   (req, res) => {
      const errors = validationResult(req)
      if (!errors.isEmpty()) return res.status(422).json(errors)

      Cart_Item.findOne({product_id: req.body.product_id, user_id: req.body.user_id})
         .then(item => {
            item.quantity = Number(item.quantity) + Number(req.body.quantity)
            item.updated_at = dateformat(Date.now(), 'yyyy-mm-dd HH:MM:ss')
            item.markModified('quantity')
            item.markModified('updated_at')
            item.save()
            return res.json({message: v_m[req.body.locale].response.success_save})
         })
         .catch(err => {
            const data = {
               user_id: req.body.user_id,
               product_id: req.body.product_id,
               quantity: req.body.quantity,
               created_at: dateformat(Date.now(), 'yyyy-mm-dd HH:MM:ss')
            }
            const cartItem = new Cart_Item(data)
            cartItem.save((err, data) => {
               if (err) console.log(err)
               return res.json({message: v_m[req.body.locale].response.success_save})
            })
         })
   }
]

module.exports.getCartItems = [
   (req, res) => {
      Cart_Item.find({user_id: req.params.user_id}, (err, data) => {
         if (err) console.log(err)
         return res.json(data)
      })
   }
]

module.exports.updateCart = [
   (req, res) => {
      Cart_Item.findById(req.params.item_id)
         .then(item => {
            item.quantity = Number(req.body.quantity)
            item.updated_at = dateformat(Date.now(), 'yyyy-mm-dd HH:MM:ss')
            item.markModified('quantity')
            item.markModified('updated_at')
            item.save()
            return res.json({message: v_m[req.body.locale].response.success_save})
         })
         .catch(err => {
            return res.status(404).json({message: v_m[req.body.locale].not_found.item_id})
         })
   }
]

module.exports.deleteFromCart = [
   (req, res) => {
      Cart_Item.findByIdAndDelete(req.params.item_id)
         .then(item => {
            Cart_Item.find({user_id: item.user_id})
               .then(items => {
                  return res.json(items)
               })
         })
         .catch(err => {
            return res.status(404).json({message: v_m['en'].not_found.item_id})
         })
   }
]

////////////////////////////////////// order
module.exports.addOrder = [
   [
      body('user_id')
         .custom((value, {req}) => {
            return User.findById(value)
               .then(user => {
                  return true
               })
               .catch(err => {
                  return Promise.reject(v_m[req.body.locale].not_found.user_id)
               })
         })
   ],
   //////////////////// validation step
   (req, res, next) => {
      Cart_Item.find({user_id: req.body.user_id})
         .then(items => {
            // check if cart is not empty
            if (items.length) {
               // check product stock
               let outOfRun = []
               items.forEach(async (item, index) => {
                  await Product.findById(item.product_id)
                     .then(product => {
                        if (product.stock < item.quantity) {
                           outOfRun.push({
                              product_id: product._id,
                              category_id: product.category,
                              stock: product.stock
                           })
                           item.remove()
                        }
                        if (index + 1 === items.length) {
                           if (!outOfRun.length) return next()
                           else return res.status(422).json(outOfRun)
                        }
                     })
               })
            } else {
               return res.status(404).json({message: v_m[req.body.locale].response.cart_empty})
            }
         })
   },
   //////////////////// save order
   (req, res) => {
      Cart_Item.find({user_id: req.body.user_id})
         .then(items => {
            // save the order
            const orderData = {
               user_id: req.body.user_id,
               number: Date.now(),
               created_at: dateformat(Date.now(), 'yyyy-mm-dd HH:MM:ss')
            }
            const order = new Order(orderData)
            order.save((err, order) => {
               if (err) console.log(err)

               // get price unit for items
               let unit = localeController.locales.filter(item => {
                  return item.value === req.body.locale
               })[0].currency

               // add incomplete status to order
               order.statuses.push({
                  status: 'incomplete',
                  created_at: dateformat(Date.now(), 'yyyy-mm-dd HH:MM:ss')
               })

               // add each item (Cart_Item result) to the order (saved Order result) and then remove it
               items.forEach((item, index) => {

                  // get the price of each item depend on order locale
                  Product.findById(item.product_id).then(product => {
                     let data = {
                        product_id: item.product_id,
                        quantity: item.quantity,
                        price: product.product_details[req.body.locale].price,
                        price_unit: unit,
                        created_at: dateformat(Date.now(), 'yyyy-mm-dd HH:MM:ss')
                     }
                     order.order_items.push(data)
                     // reduce the product stock
                     product.stock = Number(product.stock) - Number(item.quantity)
                     product.save()
                     item.remove()
                     if (index + 1 === items.length) {
                        order.save()
                        return res.json(order)
                     }
                  })
               })
            })

         })
         .catch(err => {
            return res.status(500).json(err)
         })
   }
]

module.exports.addAddressToOrder = [
   (req, res) => {
      Order.findById(req.params.order_id)
         .then(order => {
            if (!order.address) {
               User.findOne({'addresses._id': req.body.address_id})
                  .then(user => {
                     order.address = user.addresses.id(req.body.address_id)
                     // add processing status to order
                     order.statuses.push({
                        status: 'processing',
                        created_at: dateformat(Date.now(), 'yyyy-mm-dd HH:MM:ss')
                     })
                     order.save()
                     return res.json(order)
                  })
                  .catch(err => {
                     console.log(err)
                  })
            } else {
               return res.status(500).json({message: v_m[req.body.locale].response.already_has_address})
            }
         })
         .catch(err => {
            console.log(err)
            return res.status(404).json({message: v_m[req.body.locale].not_found.order_id})
         })
   }
]

module.exports.addStatusToOrder = [
   (req, res) => {
      Order.findById(req.params.order_id)
         .then(order => {
            order.statuses.push({
               status: req.body.status,
               created_at: dateformat(Date.now(), 'yyyy-mm-dd HH:MM:ss')
            })
            order.save()
            return res.json(order)
         })
         .catch(err => {
            return res.status(500).json(err)
         })
   }
]

module.exports.getOrders = [
   (req, res) => {
      Order.find({user_id: req.params.user_id})
         .then(orders => {
            return res.json(orders)
         })
         .catch(err => {
            return res.status(500).json(err)
         })
   }
]

module.exports.getOneOrder = [
   (req, res) => {
      Order.findById(req.params.order_id)
         .then(order => {
            return res.json(order)
         })
         .catch(err => {
            return res.status(500).json(err)
         })
   }
]

////////////////////////////////////// get list of all orders for admin
module.exports.getAllOrders = [
   (req, res) => {
      Order.find({})
         .then(orders => {
            return res.json(orders)
         })
         .catch(err => {
            return res.status(500).json(err)
         })
   }
]