Priceflow/app/services/scheduler_service.py

import asyncio
import logging
from datetime import UTC, datetime

from apscheduler.schedulers.asyncio import AsyncIOScheduler

from app import database, models
from app.ai_schema import AIExtractionMetadata, AIExtractionResponse
from app.services.ai_service import AIService
from app.services.item_service import ItemService
from app.services.notification_service import NotificationService
from app.services.browserless_service import browserless_service
from app.services.tracking_scraper_service import ScraperService, ScrapeConfig

logger = logging.getLogger(__name__)
scheduler = AsyncIOScheduler()

PRICE_CHANGE_THRESHOLD_PERCENT = 20.0
LOW_CONFIDENCE_THRESHOLD = 0.7


def _get_thresholds():
    with database.SessionLocal() as session:
        settings = {s.key: s.value for s in session.query(models.Settings).all()}
        return {
            "price": float(settings.get("confidence_threshold_price", "0.5")),
            "stock": float(settings.get("confidence_threshold_stock", "0.5")),
        }


def _update_db_result(
    item_id: int,
    extraction: AIExtractionResponse,
    metadata: AIExtractionMetadata,
    thresholds: dict,
    screenshot_path: str,
):
    with database.SessionLocal() as session:
        item = session.query(models.Item).filter(models.Item.id == item_id).first()
        if not item:
            return None, None

        old_price, old_stock = item.current_price, item.in_stock
        price, in_stock = extraction.price, extraction.in_stock
        p_conf, s_conf = extraction.price_confidence, extraction.in_stock_confidence

        if price is not None:
            if p_conf >= thresholds["price"]:
                if (
                    old_price
                    and (abs(price - old_price) / old_price * 100 > PRICE_CHANGE_THRESHOLD_PERCENT)
                    and p_conf < LOW_CONFIDENCE_THRESHOLD
                ):
                    item.last_error = f"Uncertain: Large price change with low confidence ({p_conf:.2f})"
                else:
                    item.last_error = None
                item.current_price = price
                item.current_price_confidence = p_conf

            session.add(
                models.PriceHistory(
                    item_id=item.id,
                    price=price,
                    screenshot_path=screenshot_path,
                    price_confidence=p_conf,
                    in_stock_confidence=s_conf,
                    ai_model=metadata.model_name,
                    ai_provider=metadata.provider,
                    prompt_version=metadata.prompt_version,
                    repair_used=metadata.repair_used,
                )
            )

        if in_stock is not None and s_conf >= thresholds["stock"]:
            item.in_stock = in_stock
            item.in_stock_confidence = s_conf

        item.last_checked = datetime.now(UTC)
        item.is_refreshing = False
        if item.last_error and not item.last_error.startswith("Uncertain:"):
            item.last_error = None

        session.commit()
        return old_price, old_stock


def _update_db_error(item_id, error_msg):
    with database.SessionLocal() as session:
        if item := session.query(models.Item).filter(models.Item.id == item_id).first():
            item.is_refreshing = False
            item.last_error = error_msg
            item.last_checked = datetime.now(UTC)
            session.commit()


async def process_item_check(item_id: int):
    loop = asyncio.get_running_loop()
    with database.SessionLocal() as session:
        item_data, config = await loop.run_in_executor(None, ItemService.get_item_data_for_checking, session, item_id)

    if not item_data:
        logger.error(f"process_item_check: Item ID {item_id} not found")
        return

    try:
        logger.info(f"Checking item: {item_data['name']} ({item_data['url']})")
        # Use independent ScraperService for tracking
        from app.services.tracking_scraper_service import ScraperService
        
        screenshot_path, html_content = await ScraperService.scrape_item(
            url=item_data["url"],
            selector=item_data["selector"],
            item_id=item_id,
            return_html=True
        )

        if not screenshot_path:
            raise Exception("Failed to capture screenshot")

        # HYBRID EXTRACTION STRATEGY (Aligned with ImprovedSearchService)
        # 1. Try specialized parser (if available) or JSON-LD
        price = None
        in_stock = True
        
        # Site-specific parser (Gifi)
        from urllib.parse import urlparse
        domain = urlparse(item_data["url"]).netloc
        if "gifi.fr" in domain:
            from app.services.parsers.gifi_parser import GifiParser
            try:
                parser = GifiParser()
                details = parser.parse_product_details(html_content, item_data["url"])
                if details.get("price") is not None:
                    price = details["price"]
                    in_stock = details.get("in_stock", True)
                    logger.info(f"GifiParser found price: {price}€")
            except Exception as e:
                logger.debug(f"GifiParser failed: {e}")

        # Simple JSON-LD extract (if not found by specific parser)
        if price is None:
            import json
            try:
                from bs4 import BeautifulSoup
                soup = BeautifulSoup(html_content, "html.parser")
                scripts = soup.find_all("script", type="application/ld+json")
                for script in scripts:
                    if script.string:
                        try:
                            data = json.loads(script.string)
                            if isinstance(data, list): data = data[0]
                            if data.get("@type") == "Product" and "offers" in data:
                                offers = data["offers"]
                                if isinstance(offers, list) and offers: offers = offers[0]
                                if "price" in offers:
                                    price = float(str(offers["price"]).replace(',', '.'))
                                    break
                        except: pass
            except Exception as e:
                logger.debug(f"JSON-LD extraction failed: {e}")

        # 2. Try AIPriceExtractor (Text AI - Gemma 3) - Very reliable for search
        from app.services.ai_price_extractor import AIPriceExtractor
        if price is None:
            price = await AIPriceExtractor.extract_price(html_content, item_data["name"])
            if price:
                logger.info(f"AIPriceExtractor (Text) found price: {price}€")

        # 3. Fallback/Verification with AIService (Vision AI - Gemini)
        extraction = None
        metadata = None
        
        if price is not None:
            # Create a synthetic AI response if we already have a high-confidence price
            extraction = AIExtractionResponse(
                price=price,
                in_stock=in_stock,
                price_confidence=0.95,
                in_stock_confidence=0.9,
                source_type="text"
            )
            metadata = AIExtractionMetadata(
                model_name="hybrid-text-parser",
                provider="internal-hybrid",
                prompt_version="hybrid-v2",
                repair_used=False
            )
        else:
            # Fallback to Vision AI if text extraction failed
            # Use limited text context for Vision prompt to avoid token bloat
            if not (ai_result := await AIService.analyze_image(screenshot_path, page_text=html_content[:5000])):
                raise Exception("AI analysis (Vision) failed")
            extraction, metadata = ai_result

        thresholds = await loop.run_in_executor(None, _get_thresholds)
        old_price, old_stock = await loop.run_in_executor(
            None, _update_db_result, item_id, extraction, metadata, thresholds, screenshot_path
        )

        # Check for notifications
        if item_data["notification_channel"] and extraction.price:
            channel = item_data["notification_channel"]
            
            # 1. Target Price Reached
            if item_data["target_price"] and extraction.price <= item_data["target_price"]:
                # Only notify if we haven't already notified for this price (or if price dropped further)
                # For simplicity, we notify if current price <= target. 
                # Ideally we should check if we already notified recently, but let's keep it simple.
                if not old_price or old_price > item_data["target_price"]:
                    await NotificationService.send_notification(
                        channel,
                        title=f"🎯 Prix cible atteint : {item_data['name']}",
                        body=f"Le prix de {item_data['name']} est passé à {extraction.price}€ (Cible: {item_data['target_price']}€)\n{item_data['url']}"
                    )
            
            # 2. Price Drop
            elif old_price and extraction.price < old_price:
                drop_percent = (old_price - extraction.price) / old_price * 100
                if drop_percent >= 5:  # Notify only for significant drops (> 5%)
                    await NotificationService.send_notification(
                        channel,
                        title=f"📉 Baisse de prix : {item_data['name']}",
                        body=f"Le prix de {item_data['name']} a baissé de {drop_percent:.1f}% !\nNouveau prix : {extraction.price}€ (Ancien: {old_price}€)\n{item_data['url']}"
                    )



    except Exception as e:
        logger.error(f"Error in process_item_check: {e}")
        await loop.run_in_executor(None, _update_db_error, item_id, str(e))


async def scheduled_refresh():
    logger.info("Heartbeat: Checking for items due for refresh")
    loop = asyncio.get_running_loop()
    try:
        with database.SessionLocal() as session:
            due_items = await loop.run_in_executor(None, ItemService.get_due_items, session)

        for item_id, _, _ in due_items:
            await process_item_check(item_id)
    except Exception as e:
        logger.error(f"Error in scheduled refresh: {e}", exc_info=True)