[ADD] sale_management_discount: recalculate global discount

sale_management_discount/__init__.py

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+from . import models

sale_management_discount/__manifest__.py

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+{
+    'name': "sale_management_discount",
+    'author': "pkhu",
+    'license': "LGPL-3",
+    'depends': ['sale_management'],
+    'data': [],
+    'auto_install': True,
+}

sale_management_discount/models/__init__.py

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+from . import sale_order_line

sale_management_discount/models/sale_order_line.py

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+from odoo import api, models
+
+
+class SaleOrderLine(models.Model):
+    _inherit = ['sale.order.line']
+
+    @api.ondelete(at_uninstall=True)
+    def _onDelete_sale_order_line(self):
+        self._update_global_discount('delete')
+
+    def _get_global_discount_id(self):
+        return int(self.extra_tax_data.get(
+            "computation_key").split(",")[1])
+
+    def _update_global_discount(self, operation):
+        for record in self:
+            discount_order_line = record.order_id.order_line.filtered(
+                lambda o: o._is_global_discount())
+            if discount_order_line and record.id not in discount_order_line.ids:
+                for val in discount_order_line:
+                    DOL_id = val._get_global_discount_id()
+                    domain = [('order_id', 'in', record.order_id),
+                              ('id', 'not in', discount_order_line.ids)]
+                    if operation == 'delete':
+                        domain.append(('id', 'not in', record.ids))
+                    total_price = dict(record.env['sale.order.line']._read_group(
+                        domain=domain, aggregates=['price_subtotal:sum'], groupby=['order_id'])).get(record.order_id, 0.0)
+                    if total_price == 0:
+                        val.unlink()
+                        continue
+                    discount_per = record.env['sale.order.discount'].search(
+                        domain=[('sale_order_id', 'in', record.order_id), ('id', '=', DOL_id)]).discount_percentage
+                    new_price = -(total_price * discount_per)
+                    val.update({
+                        'price_unit': new_price})
+
+    def write(self, vals):
+        res = super().write(vals)
+        self._update_global_discount('update')
+        return res