mirror of
https://github.com/R0m1k3/Priceflow.git
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Claude
531ed1bc15
**Problem:**
AI was misinterpreting French decimal comma as thousands separator:
- "3,99 €" detected as 399.00 EUR (instead of 3.99 EUR)
- "1,99 €" detected as 199.00 EUR (instead of 1.99 EUR)
- Caused by AI reading comma as grouping separator, not decimal point
**Root Cause:**
French format uses comma for decimals: "3,99 €" = three euros ninety-nine cents
English format uses dot for decimals: "3.99 €" = three euros ninety-nine cents
AI models (trained mostly on English) interpret:
- "3,99" → "3" and "99" separate → 399 (three hundred ninety-nine)
- Should be: "3.99" → 3.99 (three point ninety-nine)
**Solution: Pre-Convert Format Before AI Processing**
1. **Normalize ALL Text** (browserless_service.py:380-386)
```python
# Convert French to English in all page text
content = re.sub(r'(\d+),(\d{2})\s*€', r'\1.\2 €', content)
# "3,99 €" → "3.99 €"
# "12,50 €" → "12.50 €"
# "1 234,56 €" → "1234.56 €" (also removes space thousands separator)
```
2. **Normalize Extracted Price** (browserless_service.py:400-410)
```python
# Convert French format in directly extracted price
normalized_price = re.sub(r'(\d+),(\d{2})', r'\1.\2', extracted_price)
# "3,99 €" → "3.99 €"
# Prepends: "PRIX DÉTECTÉ: 3.99 €" (not "3,99 €")
```
3. **Updated AI Prompt** (ai_schema.py:135-158)
- Removed instructions to convert comma→dot (now done automatically)
- Added: "The price has already been converted to English format for you"
- Added explicit warnings about common mistakes:
* "3.99 €" means 3.99 (NOT 399.00, NOT 3990.00)
* "1.99 €" means 1.99 (NOT 199.00, NOT 1990.00)
- Clear examples with both CORRECT and INCORRECT values
**Flow:**
```
Page text: "Lutin 3,99 € Ajouter au panier"
↓
Normalization: "Lutin 3.99 € Ajouter au panier"
↓
Extracted price: "3,99 €" → Normalized: "3.99 €"
↓
Sent to AI: "PRIX DÉTECTÉ: 3.99 €\n\nLutin 3.99 € Ajouter au panier"
↓
AI sees only English format: "3.99"
↓
AI Response: {"price": 3.99} ✅ CORRECT
```
**Expected Results:**
- Before: "3,99 €" → AI returns 399.00 ❌
- After: "3,99 €" → Normalized to "3.99 €" → AI returns 3.99 ✅
**Regex Details:**
- `(\d+),(\d{2})\s*€` matches French prices: captures digits before comma, 2 digits after
- `\1.\2 €` replaces with: same digits, dot instead of comma, space + euro symbol
- Handles: 0,99 / 3,99 / 12,99 / 89,99 / 1234,99
Fixes issue where AI misread French decimal comma causing 100x price errors.