odoo.define('pos_discount_manager.DiscountButton', function(require) {
    'use strict';

    const { useListener } = require('web.custom_hooks');
    const Registries = require('point_of_sale.Registries');
    var models = require('point_of_sale.models');
    var DiscountButton = require('pos_discount.DiscountButton')
    models.load_fields('hr.employee', ['limited_discount']);

    const DiscountButtonManger = (DiscountButton) =>
        class extends DiscountButton {
         /**
         *Override discount button to check the limit
         */
        async onClick() {
            const { confirmed, payload } = await this.showPopup('NumberPopup',{
                title: this.env._t('Discount Percentage'),
                startingValue: this.env.pos.config.discount_pc,
            });
            if (confirmed) {
                const val = Math.round(Math.max(0,Math.min(100,parseFloat(payload))));
                await self.apply_discount(val);
            }
        }

        async apply_discount(pc) {
            var order    = this.env.pos.get_order();
            var lines    = order.get_orderlines();
            var product  = this.env.pos.db.get_product_by_id(this.env.pos.config.discount_product_id[0]);
            if (product === undefined) {
                await this.showPopup('ErrorPopup', {
                    title : this.env._t("No discount product found"),
                    body  : this.env._t("The discount product seems misconfigured.Make sure it is flagged as 'Can be Sold' and 'Available in Point of Sale'."),
                });
                return;
            }
            /**
             *Remove existing discounts
             */
            var i = 0;
            while ( i < lines.length ) {
                if (lines[i].get_product() === product) {
                    order.remove_orderline(lines[i]);
                } else {
                    i++;
                }
            }
            //We add the price as manually set to avoid recomputation when changing customer.
            var base_to_discount = order.get_total_without_tax();
            if (product.taxes_id.length){
                var first_tax = this.env.pos.taxes_by_id[product.taxes_id[0]];
                if (first_tax.price_include) {
                    base_to_discount = order.get_total_with_tax();
                }
            }
            var discount = - pc / 100.0 * base_to_discount;

            if( discount < 0 ){
                order.add_product(product, {
                    price: discount,
                    lst_price: discount,
                    extras: {
                        price_manually_set: true,
                        disc_percentage: pc,
                    },
                });
            }
        }
    };

    Registries.Component.extend(DiscountButton, DiscountButtonManger);

    return DiscountButtonManger;
});