✨ Feat: Invoice viewing, JoFotara UBL refinements, delete functionality, and tax rate validation

backend/src/modules/invoices/invoice.service.ts

@@ -10,9 +10,13 @@ import {
   ForbiddenException,
   Inject,
   forwardRef,
+  InternalServerErrorException,
+  StreamableFile,
 } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
+import * as fs from 'fs';
+import * as path from 'path';
 import { InjectQueue } from '@nestjs/bull';
 import { Queue } from 'bull';
 import { Invoice, InvoiceStatus } from './entities/invoice.entity';
@@ -157,4 +161,39 @@ export class InvoicesService {
       throw error;
     }
   }
+
+  /**
+   * حذف الفاتورة والملف التابع لها
+   */
+  async remove(tenantId: string, id: string): Promise<void> {
+    const invoice = await this.findOne(tenantId, id);
+    
+    // 1. Delete file if exists
+    if (invoice.original_file_path) {
+      await this.localStorageService.deleteFile(invoice.original_file_path);
+    }
+
+    // 2. Delete from DB (lines will be deleted via CASCADE)
+    await this.invoiceRepository.delete(id);
+  }
+
+  /**
+   * الحصول على الملف كـ Stream
+   */
+  async getFile(tenantId: string, id: string): Promise<StreamableFile> {
+    const invoice = await this.findOne(tenantId, id);
+    if (!invoice.original_file_path) {
+      throw new NotFoundException('Invoice file not found');
+    }
+
+    const storageRoot = this.localStorageService['storageRoot']; // Accessing private for path resolve
+    const fullPath = path.join(storageRoot, invoice.original_file_path);
+
+    if (!fs.existsSync(fullPath)) {
+      throw new NotFoundException('File does not exist on disk');
+    }
+
+    const file = fs.createReadStream(fullPath);
+    return new StreamableFile(file);
+  }
 }