v0.2 - 19 features: comparator, allergies, gamification, shopping list, achievements, stats, profile, share, bottom nav

backend/app/routers/compare.py

@@ -0,0 +1,48 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+import json
+from app.database import get_db
+from app.models.user import User
+from app.models.scan import Scan
+from app.models.product import Product
+from app.utils.security import get_current_user
+from app.services.achievements import check_achievements
+
+router = APIRouter(prefix="/api", tags=["compare"])
+
+@router.post("/compare")
+async def compare_products(data: dict, user: User = Depends(get_current_user), db: AsyncSession = Depends(get_db)):
+    scan_ids = data.get("scan_ids", [])
+    if len(scan_ids) < 2 or len(scan_ids) > 4:
+        raise HTTPException(status_code=400, detail="Selecione entre 2 e 4 produtos")
+    
+    results = []
+    for sid in scan_ids:
+        res = await db.execute(select(Scan).where(Scan.id == sid, Scan.user_id == user.id))
+        scan = res.scalar_one_or_none()
+        if not scan:
+            raise HTTPException(status_code=404, detail=f"Scan {sid} não encontrado")
+        
+        analysis = json.loads(scan.analysis_json or '{}')
+        prod_res = await db.execute(select(Product).where(Product.barcode == scan.barcode))
+        product = prod_res.scalar_one_or_none()
+        
+        results.append({
+            "scan_id": scan.id,
+            "product_name": scan.product_name,
+            "brand": scan.brand,
+            "score": scan.score,
+            "image_url": product.image_url if product else None,
+            "nutri_score": product.nutri_score if product else None,
+            "nova_group": product.nova_group if product else None,
+            "positives": analysis.get("positives", []),
+            "negatives": analysis.get("negatives", []),
+            "nutrition": analysis.get("nutrition", {}),
+            "nutrition_verdict": analysis.get("nutrition_verdict", ""),
+        })
+    
+    # Check comparison achievement
+    await check_achievements(user.id, db, action="compare")
+    
+    return {"products": results}