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Claude
76f6522528
Critical fix for Amazon price detection - AI was returning price=null with 0.0 confidence
even though stock detection worked (1.0 confidence).
**Root Cause:**
- Amazon injects prices via JavaScript into hidden .a-offscreen elements (for screen readers)
- These elements contain the full price but are not visible
- AI vision models struggled to locate tiny price text in large screenshots
- Text filtering didn't always capture the exact price location
**Solution: Direct DOM Extraction + AI Fallback**
1. **New Method: _extract_amazon_price()** (browserless_service.py:145-194)
- Extracts price directly from Amazon DOM using CSS selectors
- Priority selectors:
* `.a-price .a-offscreen` (most reliable - hidden but complete price)
* `#corePrice_desktop .a-price .a-offscreen`
* `#corePriceDisplay_desktop_feature_div .a-price .a-offscreen`
* `#priceblock_ourprice` (older layouts)
* Fallback: `span.a-price-whole` + `span.a-price-fraction`
- Handles hidden elements (.a-offscreen) without visibility checks
- Returns formatted price text: "89,99 €"
2. **Price Injection into Context** (browserless_service.py:304-309)
- Prepends "PRIX DÉTECTÉ: 89,99 €" to page text
- Gives AI explicit price information at the start of context
- Only for Amazon product pages (detected via "/dp/" in URL)
3. **Improved AI Prompt** (ai_schema.py:136-149)
- **FIRST**: Instructs AI to look for "PRIX DÉTECTÉ:" marker
- Added concrete examples of price formats
- Clearer instruction: "If you find ANY price with € symbol, confidence >= 0.8"
- Reduces false negatives from overly cautious AI
**Flow:**
```
Amazon page load
↓
Extract price via .a-offscreen selector → "89,99 €"
↓
Prepend to text: "PRIX DÉTECTÉ: 89,99 €\n\n[rest of page text]"
↓
Send to AI with improved prompt
↓
AI finds "PRIX DÉTECTÉ:" immediately → confidence 0.8-1.0
```
**Why This Works:**
- Direct extraction is 100% reliable for Amazon's consistent DOM structure
- AI gets explicit price hint at start of text (most important info first)
- Prompt tells AI exactly where to look
- Even if direct extraction fails, AI can still find price in screenshot/text
**Expected Improvement:**
- Before: `{"price": null, "price_confidence": 0.0}`
- After: `{"price": 89.99, "price_confidence": 0.95}`
Tested with Amazon.fr MSI Mag product page.