`US-003-IMPLEMENTATION.md`

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# US-003 Implementation Summary

**Story**: Update product lead time in custom metafields
**Status**: ✅ COMPLETED
**Date**: 2026-02-03

## Overview

Implemented functionality to update the `custom.delivery_time` metafield for Brand McKenzie products in Shopify. The implementation supports both creating new metafields and updating existing ones, with proper error handling and batch processing capabilities.

## Implementation Details

### Files Modified

1. **lib/shopify-client.ts**
   - Added `updateDeliveryTime()` method
   - Added `batchUpdateDeliveryTime()` method
   - Both methods handle create and update paths automatically

2. **scripts/test-us-003-delivery-time.ts**
   - Comprehensive test suite validating all acceptance criteria
   - Tests single updates, batch updates, and error handling

### Key Features

#### 1. Single Product Update
```typescript
async updateDeliveryTime(productId: number, deliveryTime: string = '3-5 Weeks'): Promise<{
  success: boolean;
  productId: number;
  error?: string;
}>
```

- Checks if metafield already exists
- Creates new metafield if not found
- Updates existing metafield if found
- Returns success/failure status

#### 2. Batch Processing
```typescript
async batchUpdateDeliveryTime(
  productIds: number[],
  deliveryTime: string = '3-5 Weeks'
): Promise<{
  total: number;
  successful: number;
  failed: number;
  results: Array<{ productId: number; success: boolean; error?: string }>;
}>
```

- Processes multiple products sequentially
- Respects Shopify API rate limits (500ms between requests)
- Provides detailed results for each product

## Test Results

All acceptance criteria verified:

✅ **AC1**: Updates product.delivery_time metafield to '3-5 Weeks' value
✅ **AC2**: Creates metafield if it doesn't exist on the product
✅ **AC3**: Saves changes successfully to Shopify via API
✅ **AC4**: Returns success/failure status for each product update
✅ **AC5**: Typecheck passes

### Test Execution Output

```
🧪 Testing US-003: Update product lead time in custom metafields

✓ Test 1: Update delivery_time metafield to "3-5 Weeks"
  ✅ Metafield updated successfully
  ✅ Product ID: 7245733593139

✓ Test 2: Verify metafield exists after update
  ✅ delivery_time metafield found
  ✅ Value: 3-5 Weeks
  ✅ Type: single_line_text_field
  ✅ Namespace: custom

✓ Test 3: Update existing metafield
  ✅ Existing metafield updated successfully

✓ Test 4: Batch update multiple products
  ✅ Total: 3
  ✅ Successful: 3
  ✅ Failed: 0

✓ Test 5: Error handling for invalid product ID
  ✅ Error handled correctly for invalid product

✓ Test 6: Typecheck passes
  ✅ TypeScript compilation successful

📊 Tested with 115 Brand McKenzie products
```

## API Integration

### Metafield Structure

- **Namespace**: `custom`
- **Key**: `delivery_time`
- **Type**: `single_line_text_field`
- **Value**: `3-5 Weeks`

### Shopify Endpoints Used

1. **GET** `/admin/api/2024-01/products/{productId}/metafields.json`
   - Fetch existing metafields to check if delivery_time exists

2. **POST** `/admin/api/2024-01/products/{productId}/metafields.json`
   - Create new metafield

3. **PUT** `/admin/api/2024-01/products/{productId}/metafields/{metafieldId}.json`
   - Update existing metafield

## Error Handling

- Network failures return error status with message
- Invalid product IDs return 404 error
- Individual failures in batch operations don't stop processing
- All errors are logged and returned in result object

## Rate Limiting

- Built-in 500ms delay between requests
- Prevents API throttling
- Ensures reliable batch processing

## Usage Example

```typescript
import { ShopifyClient } from '../lib/shopify-client';

const client = new ShopifyClient();

// Update single product
const result = await client.updateDeliveryTime(7245733593139);
console.log(result.success); // true

// Batch update
const batchResult = await client.batchUpdateDeliveryTime([
  7245733593139,
  7245733724211,
  7245733822515
]);
console.log(`${batchResult.successful}/${batchResult.total} successful`);
```

## Next Steps

US-003 is complete. Ready to proceed to:
- **US-004**: Update lead time in product descriptions
- **US-005**: Fetch manufacturer product data from websites
- **US-006**: Orchestrate bulk product processing with error handling
- **US-007**: Integrate AI analysis for product data quality

## Commits

1. `feat(US-003): Update product lead time in custom metafields` (6b97b14)
2. `docs: Mark US-003 as complete in PRD and progress` (8c70db2)