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

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 browserless service with extract_text=True for monitoring
        page_text, screenshot_path = await browserless_service.get_page_content(
            item_data["url"],
            use_proxy="amazon" in item_data["url"],
            wait_selector=item_data["selector"],
            extract_text=True  # Get visible text for AI analysis
        )
        
        # Determine availability based on content presence
        # If we got content, we assume available unless proven otherwise
        is_available = bool(page_text and len(page_text) > 500)

        # Update availability status in database
        with database.SessionLocal() as session:
            if item := session.query(models.Item).filter(models.Item.id == item_id).first():
                item.is_available = is_available
                if not is_available:
                    logger.warning(f"Product {item_id} marked as unavailable")
                    item.last_error = "Product no longer available (404 or not found)"
                session.commit()

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

        if not (ai_result := await AIService.analyze_image(screenshot_path, page_text=page_text)):
            raise Exception("AI analysis 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)