# YangMing Scraper - Implementation Summary

## ✅ Completed Tasks

### 1. Updated YangMing Scraper Implementation
**File**: `src/lib/shipping-scraper.ts` (Lines 1013-1152)

**Changes**:
- Replaced non-functional API-based approach with **Puppeteer-based web scraping**
- Now properly navigates the YangMing tracking page and extracts ETA
- Implements robust error handling and multiple fallback patterns

**Implementation Details**:
```
Flow: Browser Launch → Page Load → Input Fill → Search → Wait → Extract ETA → Return Result
```

### 2. ETA Extraction Logic
The scraper extracts ETA using these patterns (in order of priority):
1. **Full Pattern**: `ETA at [PORT]: YYYY/MM/DD HH:MM`
   - Example: `ETA at SINGAPORE: 2026/05/20 00:00`
2. **Fallback**: `ETA[any chars]YYYY/MM/DD HH:MM`
3. **Generic**: Any date matching `YYYY/MM/DD`

### 3. Date Format Handling
- **Input Format**: YYYY/MM/DD (YangMing native)
- **Output Format**: YYYY-MM-DD (ISO standard)
- **Conversion**: Handled by existing `formatETA()` function (line 1577-1580)

### 4. Integration into Main Scraping Flow
**File**: `src/lib/shipping-scraper.ts` (Line 1777-1778)
```typescript
else if (carrierLower === "yangming") {
  eta = await scrapYangMing(containerNumber);
}
```

### 5. Created Test Script
**File**: `scripts/test-yangming-scraper.ts`
- Tests YangMing scraper with a real container number
- Validates ETA extraction and formatting
- Usage: `npx ts-node scripts/test-yangming-scraper.ts YMLU5511687`

### 6. Created Documentation
**File**: `docs/YANGMING-SCRAPER.md`
- Complete tracking information
- Database schema examples
- Code reference and error handling
- Testing procedures
- Known issues and maintenance guide

## 📋 Configuration Status

### Database
- ✅ Carrier field is TEXT (supports any string)
- ✅ No migrations needed
- ✅ Container YMLU5511687 can be inserted directly

### Scraper Configuration
- ✅ URL: `https://www.yangming.com/en/esolution/cargo_tracking`
- ✅ Method: Puppeteer (JavaScript rendering)
- ✅ Input: First text input field for container number
- ✅ Search: Automatic (button click or Enter key)

### Date Processing
- ✅ Input format: `2026/05/20 00:00`
- ✅ Output format: `2026-05-20`
- ✅ Conversion automatic in `formatETA()`

## 🧪 Test Container
```
Container Number: YMLU5511687
Tracking URL: https://www.yangming.com/en/esolution/cargo_tracking
Expected ETA: 2026/05/20 00:00 (Singapore)
```

## 📊 Code Changes Summary

| File | Lines | Change |
|------|-------|--------|
| `src/lib/shipping-scraper.ts` | 1013-1152 | Replaced API approach with Puppeteer scraper |
| `scripts/test-yangming-scraper.ts` | NEW | Test script for YangMing scraper |
| `docs/YANGMING-SCRAPER.md` | NEW | Complete documentation |

## 🔍 How It Works

### When container with carrier="yangming" is processed:

1. **Database Query**: Finds container in `container_shipment` table
2. **Scraper Call**: 
   ```typescript
   const result = await scrapeShippingETA("YMLU5511687", "yangming");
   ```
3. **Browser Automation**:
   - Launches headless Chrome
   - Navigates to YangMing tracking page
   - Fills container number in search form
   - Presses Enter or clicks search button
   - Waits 10 seconds for results
4. **ETA Extraction**: Uses regex to find date pattern
5. **Format Conversion**: YYYY/MM/DD → YYYY-MM-DD
6. **Result Storage**:
   - Updates `container_shipment.eta` 
   - Logs history in `container_tracking_history`
   - Records status (success/not_found/error)

## ✨ Features

- ✅ Automatic carrier detection (case-insensitive)
- ✅ Multiple fallback patterns for robustness
- ✅ Proper error handling and logging
- ✅ Browser resource cleanup
- ✅ Anti-bot evasion (Puppeteer Stealth plugin)
- ✅ Realistic user agent and headers
- ✅ 10-second wait for dynamic content loading

## 🚀 Usage

### Direct scraper call:
```javascript
import { scrapeShippingETA } from '@/lib/shipping-scraper';

const result = await scrapeShippingETA("YMLU5511687", "yangming");
// Result:
// {
//   etaRaw: "2026/05/20 00:00",
//   etaFormatted: "2026-05-20",
//   status: "success"
// }
```

### Via database update:
```javascript
import { updateETAInDatabase } from '@/lib/shipping-scraper';

const result = await scrapeShippingETA(container.container_number, "yangming");
await updateETAInDatabase(pool, container.id, "yangming", result);
```

## 📝 Notes

- YangMing (陽明海運) is a Taiwanese carrier
- Container format: YMLU followed by 7 digits
- Tracking page is built with Next.js (requires JavaScript)
- Results typically include multiple ETAs (departure, intermediate, arrival)
- Scraper extracts the last/final ETA found