feat: add discount functionality to sales and purchase transactions

- Introduced discount_type and discount fields in Bills and SalesReceipts controllers.
- Updated database migrations to include discount and discount_type in estimates and credit notes tables.
- Enhanced SaleReceipt and SaleEstimate models to support discount attributes.
- Implemented formatting for discount amounts in transformers and PDF templates.
- Updated email templates to display discount information.

This commit enhances the handling of discounts across various transaction types, improving the overall functionality and user experience.

packages/server/src/api/controllers/Purchases/Bills.ts

@@ -4,6 +4,7 @@ import { check, param, query } from 'express-validator';
 import {
   AbilitySubject,
   BillAction,
+  DiscountType,
   IBillDTO,
   IBillEditDTO,
 } from '@/interfaces';
@@ -144,8 +145,15 @@ export default class BillsController extends BaseController {
         .isNumeric()
         .toInt(),
 
+      // Attachments
       check('attachments').isArray().optional(),
       check('attachments.*.key').exists().isString(),
+
+      // # Discount
+      check('discount_type')
+        .default(DiscountType.Amount)
+        .isIn([DiscountType.Amount, DiscountType.Percentage]),
+      check('discount').optional().isDecimal().toFloat(),
     ];
   }
 

packages/server/src/api/controllers/Sales/SalesReceipts.ts

@@ -11,7 +11,7 @@ import {
 import { ServiceError } from '@/exceptions';
 import DynamicListingService from '@/services/DynamicListing/DynamicListService';
 import CheckPolicies from '@/api/middleware/CheckPolicies';
-import { AbilitySubject, SaleReceiptAction } from '@/interfaces';
+import { AbilitySubject, DiscountType, SaleReceiptAction } from '@/interfaces';
 import { SaleReceiptApplication } from '@/services/Sales/Receipts/SaleReceiptApplication';
 import { ACCEPT_TYPE } from '@/interfaces/Http';
 
@@ -178,6 +178,12 @@ export default class SalesReceiptsController extends BaseController {
 
       // Pdf template id.
       check('pdf_template_id').optional({ nullable: true }).isNumeric().toInt(),
+
+      // # Discount
+      check('discount').optional({ nullable: true }).isNumeric().toFloat(),
+      check('discount_type')
+        .optional({ nullable: true })
+        .isIn([DiscountType.Percentage, DiscountType.Amount]),
     ];
   }