feat: item-level discount

packages/server/src/services/Sales/Invoices/ItemEntryTransformer.ts

@@ -1,4 +1,4 @@
-import { IItemEntry } from '@/interfaces';
+import { DiscountType, IItemEntry } from '@/interfaces';
 import { Transformer } from '@/lib/Transformer/Transformer';
 import { formatNumber } from '@/utils';
 
@@ -8,7 +8,13 @@ export class ItemEntryTransformer extends Transformer {
    * @returns {Array}
    */
   public includeAttributes = (): string[] => {
-    return ['quantityFormatted', 'rateFormatted', 'totalFormatted'];
+    return [
+      'quantityFormatted',
+      'rateFormatted',
+      'totalFormatted',
+      'discountFormatted',
+      'discountAmountFormatted',
+    ];
   };
 
   /**
@@ -43,4 +49,34 @@ export class ItemEntryTransformer extends Transformer {
       money: false,
     });
   };
+
+  /**
+   * Retrieves the formatted discount of item entry.
+   * @param {IItemEntry} entry
+   * @returns {string}
+   */
+  protected discountFormatted = (entry: IItemEntry): string => {
+    if (!entry.discount) {
+      return '';
+    }
+    return entry.discountType === DiscountType.Percentage
+      ? `${entry.discount}%`
+      : formatNumber(entry.discount, {
+          currencyCode: this.context.currencyCode,
+          money: false,
+        });
+  };
+
+  /**
+   * Retrieves the formatted discount amount of item entry.
+   * @param {IItemEntry} entry
+   * @returns {string}
+   */
+  protected discountAmountFormatted = (entry: IItemEntry): string => {
+    return formatNumber(entry.discountAmount, {
+      currencyCode: this.context.currencyCode,
+      money: false,
+      excerptZero: true,
+    });
+  };
 }