[FIX] sale_triple_discount: Fixed tax amount on report

sale_triple_discount/models/sale_order.py

@@ -3,7 +3,10 @@
 # Copyright 2017 - 2019 Alex Comba - Agile Business Group
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
+from functools import partial
+
 from odoo import api, models
+from odoo.tools import formatLang
 
 
 class SaleOrder(models.Model):
@@ -17,24 +20,56 @@ def _amount_all(self):
         super()._amount_all()
         self.env["sale.order.line"].triple_discount_postprocess(prev_values)
 
-    def _get_tax_amount_by_group(self):
+    def _amount_by_group(self):
+        super()._amount_by_group()
+
         # Copy/paste from standard method in sale
-        self.ensure_one()
-        res = {}
-        for line in self.order_line:
-            price_reduce = line.price_reduce  # changed
-            taxes = line.tax_id.compute_all(
-                price_reduce,
-                quantity=line.product_uom_qty,
-                product=line.product_id,
-                partner=self.partner_shipping_id,
-            )["taxes"]
-            for tax in line.tax_id:
-                group = tax.tax_group_id
-                res.setdefault(group, 0.0)
-                for t in taxes:
-                    if t["id"] == tax.id or t["id"] in tax.children_tax_ids.ids:
-                        res[group] += t["amount"]
-        res = sorted(list(res.items()), key=lambda l: l[0].sequence)
-        res = [(line[0].name, line[1]) for line in res]
-        return res
+        for order in self:
+            currency = order.currency_id or order.company_id.currency_id
+            fmt = partial(
+                formatLang,
+                self.with_context(lang=order.partner_id.lang).env,
+                currency_obj=currency,
+            )
+            res = {}
+
+            for line in order.order_line:
+                # Use price_reduce for tax computation
+                line._get_price_reduce()
+                price_reduce = line.price_reduce  # This line is adapted
+
+                # Calculate taxes based on price_reduce
+                taxes = line.tax_id.compute_all(
+                    price_reduce,
+                    quantity=line.product_uom_qty,
+                    product=line.product_id,
+                    partner=order.partner_shipping_id,
+                )["taxes"]
+
+                for tax in line.tax_id:
+                    group = tax.tax_group_id
+                    res.setdefault(group, {"amount": 0.0, "base": 0.0})
+
+                    for t in taxes:
+                        if t["id"] == tax.id or t["id"] in tax.children_tax_ids.ids:
+                            res[group]["amount"] += t["amount"]
+                            res[group]["base"] += t["base"]
+
+            res = sorted(res.items(), key=lambda l: l[0].sequence)
+
+            # Round amount and prevent -0.00
+            for group_data in res:
+                group_data[1]["amount"] = currency.round(group_data[1]["amount"]) + 0.0
+                group_data[1]["base"] = currency.round(group_data[1]["base"]) + 0.0
+
+            order.amount_by_group = [
+                (
+                    line[0].name,
+                    line[1]["amount"],
+                    line[1]["base"],
+                    fmt(line[1]["amount"]),
+                    fmt(line[1]["base"]),
+                    len(res),
+                )
+                for line in res
+            ]