feat: implement dispensing module with transaction-safe stock management, FEFO allocation, and H1 compliance reporting

test_billing.ts

@@ -0,0 +1,53 @@
+import { pool } from './src/db/pool';
+import { DispensingService } from './src/modules/dispensing/service';
+
+async function runTest() {
+  const dispensingService = new DispensingService();
+  const tenantId = 't1';
+  
+  // 1. Create a fake product with MRP = 20, pack_size = 10
+  const productId = 'prd_test_' + Date.now();
+  await pool.query(`
+    INSERT INTO products (id, brand_name, mrp, pack_size, tenant_id) 
+    VALUES ($1, 'Test Medicine Strip', 20.00, 10, $2)
+  `, [productId, tenantId]);
+  
+  console.log(`Created product: ${productId} with MRP 20 and pack_size 10`);
+
+  // 2. Add some stock for it so it doesn't fail expiry/stock checks
+  const batchNo = 'B_TEST_' + Date.now();
+  const nextYear = new Date(Date.now() + 365*24*60*60*1000).toISOString();
+  await pool.query(`
+    INSERT INTO batches (batch_no, product_id, expiry, qty_on_hand, tenant_id)
+    VALUES ($1, $2, $3, 100, $4)
+  `, [batchNo, productId, nextYear, tenantId]);
+  console.log(`Added batch ${batchNo} with 100 qty`);
+
+  // 3. Test Dispensing Flow (Dispense 10 tablets)
+  const payload = {
+    subject_ref: 'Patient_123',
+    items: [
+      { product_id: productId, qty: 10 }
+    ]
+  };
+
+  try {
+    console.log(`\nAttempting to dispense 10 tablets...`);
+    const result = await dispensingService.executeDispensing(payload, 'user1', tenantId);
+    console.log(`\nDispensing Successful!`);
+    console.log(`Transaction ID: ${result.dispensing_id}`);
+    console.log(`Calculated Total Amount: ₹${result.total_amount}`);
+    
+    if (parseFloat(result.total_amount) === 20) {
+      console.log('✅ TEST PASSED: 10 tablets at (20 MRP / 10 pack_size) correctly calculated as 20 rupees!');
+    } else {
+      console.log('❌ TEST FAILED: Total amount is not 20 rupees.');
+    }
+  } catch (err) {
+    console.error('Dispensing Error:', err);
+  }
+
+  process.exit(0);
+}
+
+runTest();