const session = require('session')
const database = require('database')
const cart = new Map()

// Handles cart functionality
class Cart {
    constructor() {}

    Add(x) {
        if (session().Exists(x) === true) {
            if (this.Exists(x.cookie) === false) {
                this.cart = new Map()
                database('EStore').Query('SELECT * FROM Products WHERE id = ' + x.id).then(output => {
                    if (x.qty <= output[0].qty) {cart.set(x.cookie, this.cart.get(x.id, x.qty))} else {return 'Added'}
                })
            } else {
                this.cart = cart.get(x.cookie)
                if (!this.cart.get(x.id)) {
                    database('EStore').Query('SELECT * FROM Products WHERE id = ' + x.id).then(output => {
                        if (x.qty <= output[0].qty) {this.cart.set(x.id, x.qty)} else {return 'Added'}
                    })
                } else {return 'Added'}
            }
        }
    }
    Exists(x) {return cart.has(x)}

    static Set(x) {
        this.cart = cart.get(x.cookie)
        this.cart.forEach((value, key) => this.cart.delete(key))
    }
    static GetCart(x) {
        this.cart = cart.get(x)
        if (this.cart !== undefined) {if (this.cart.size > 0) return this.cart} else {return false}
    }
    static Remove(x) {if (session().Exists(x.cookie) === true) for (let i = 0; i < x.items.length; i++) cart.get(x.cookie.delete(x.items[i]))}
}

module.exports = () => {return new Cart()}