[FIX] point_of_sale: display default pricelist price as base price

Current behavior:
When a discount is applied on a product because of a pricelist. The base
price is displayed without applying the default pricelist on it.

Steps to reproduce:
- Create product A with price of 10€
- Create pricelsit PL1 that change price of product A to 7€(fixed price)
- Create pricelist PL2 based on PL1 that use a formula to apply 10% on
  all products.
- Change PoS default pricelist to PL1 and make PL1 and PL2 available on
  the PoS.
- Open a PoS session and add product A to the order. Price should be 7€.
- Apply PL2 on the order.
- The product line shows that the price was 10€ has been discounted to
  6.30€. The base price should be 7€.

opw-3200027

closes odoo/odoo#117273

X-original-commit: 395235f202513267fcf3cde28ae51fa0a5caeb42
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>
Signed-off-by: Engels Robin (roen) <roen@odoo.com>

addons/point_of_sale/static/src/js/models.js

@@ -2409,26 +2409,25 @@ export class Orderline extends PosModel {
         }
     }
     get_taxed_lst_unit_price(){
-        var base_price = this.compute_fixed_price(this.get_base_price());
-        if (this.pos.config.iface_tax_included === "total") {
-            var product = this.get_product();
+        var lst_price = this.compute_fixed_price(this.get_lst_price());
+        if (this.pos.config.iface_tax_included === 'total') {
+            var product =  this.get_product();
             var taxes_ids = product.taxes_id;
             var product_taxes = this.pos.get_taxes_after_fp(taxes_ids);
-            return this.compute_all(product_taxes, base_price, 1, this.pos.currency.rounding)
-                .total_included;
+            return this.compute_all(product_taxes, lst_price, 1, this.pos.currency.rounding).total_included;
         }
-        return base_price;
+        return lst_price;
     }
-    get_price_without_tax() {
+    get_price_without_tax(){
         return this.get_all_prices().priceWithoutTax;
     }
-    get_price_with_tax() {
+    get_price_with_tax(){
         return this.get_all_prices().priceWithTax;
     }
-    get_price_with_tax_before_discount() {
+    get_price_with_tax_before_discount () {
         return this.get_all_prices().priceWithTaxBeforeDiscount;
     }
-    get_tax() {
+    get_tax(){
         return this.get_all_prices().tax;
     }
     get_applicable_taxes() {
@@ -2582,8 +2581,8 @@ export class Orderline extends PosModel {
     get_fixed_lst_price() {
         return this.compute_fixed_price(this.get_lst_price());
     }
-    get_lst_price() {
-        return this.product.lst_price;
+    get_lst_price(){
+        return this.product.get_price(this.pos.default_pricelist, 1, 0)
     }
     set_lst_price(price) {
         this.order.assert_editable();

addons/point_of_sale/static/tests/tours/ReceiptScreen.tour.js

@@ -65,3 +65,17 @@ PaymentScreen.do.clickValidate();
 ReceiptScreen.check.customerNoteIsThere("Test customer note");
 
 registry.category("web_tour.tours").add("ReceiptScreenTour", { test: true, url: "/pos/ui", steps: getSteps() });
+
+startSteps();
+
+ProductScreen.do.clickHomeCategory();
+ProductScreen.exec.addOrderline('Test Product', '1');
+ProductScreen.do.clickPricelistButton();
+ProductScreen.do.selectPriceList('special_pricelist');
+ProductScreen.check.discountOriginalPriceIs('7.0');
+ProductScreen.do.clickPayButton();
+PaymentScreen.do.clickPaymentMethod('Cash');
+PaymentScreen.do.clickValidate();
+ReceiptScreen.check.discountAmountIs('0.7');
+
+registry.category("web_tour.tours").add("ReceiptScreenDiscountWithPricelistTour", { test: true, url: "/pos/ui", steps: getSteps() });

addons/point_of_sale/static/tests/tours/helpers/ProductScreenTourMethods.js

@@ -282,6 +282,15 @@ class Check {
             },
         ];
     }
+    discountOriginalPriceIs(original_price) {
+        return [
+            {
+                content: `discount original price is shown`,
+                trigger: `s:contains('${original_price}')`,
+                run: function () {},
+            },
+        ];
+    }
 }
 
 class Execute {

addons/point_of_sale/static/tests/tours/helpers/ReceiptScreenTourMethods.js

@@ -81,6 +81,15 @@ class Check {
             },
         ];
     }
+
+    discountAmountIs(value) {
+        return [
+            {
+                trigger: `.pos-receipt>div:contains("Discounts")>span:contains("${value}")`,
+                run: () => {},
+            },
+        ];
+    }
 }
 
 class Execute {

addons/point_of_sale/tests/test_frontend.py

@@ -730,3 +730,46 @@ class TestUi(TestPointOfSaleHttpCommon):
         })
         self.main_pos_config.open_ui()
         self.start_tour("/pos/ui?config_id=%d" % self.main_pos_config.id, 'FiscalPositionNoTax', login="accountman")
+
+    def test_06_pos_discount_display_with_multiple_pricelist(self):
+        """ Test the discount display on the POS screen when multiple pricelists are used."""
+        test_product = self.env['product.product'].create({
+            'name': 'Test Product',
+            'available_in_pos': True,
+            'list_price': 10,
+            'taxes_id': False,
+        })
+
+        base_pricelist = self.env['product.pricelist'].create({
+            'name': 'base_pricelist',
+            'discount_policy': 'without_discount',
+        })
+
+        self.env['product.pricelist.item'].create({
+            'pricelist_id': base_pricelist.id,
+            'product_tmpl_id': test_product.product_tmpl_id.id,
+            'compute_price': 'fixed',
+            'applied_on': '1_product',
+            'fixed_price': 7,
+        })
+
+        special_pricelist = self.env['product.pricelist'].create({
+            'name': 'special_pricelist',
+            'discount_policy': 'without_discount',
+        })
+        self.env['product.pricelist.item'].create({
+            'pricelist_id': special_pricelist.id,
+            'base': 'pricelist',
+            'base_pricelist_id': base_pricelist.id,
+            'compute_price': 'formula',
+            'applied_on': '3_global',
+            'price_discount': 10,
+        })
+
+        self.main_pos_config.write({
+            'pricelist_id': base_pricelist.id,
+            'available_pricelist_ids': [(6, 0, [base_pricelist.id, special_pricelist.id])],
+        })
+
+        self.main_pos_config.open_ui()
+        self.start_tour("/pos/ui?config_id=%d" % self.main_pos_config.id, 'ReceiptScreenDiscountWithPricelistTour', login="accountman")