# app/modules/checkout/services/checkout_service.py
"""
Checkout service for order creation from cart.

This module provides:
- Cart validation for checkout
- Order creation from cart
- Checkout session management

Note: This is a placeholder service. Full implementation will
integrate with cart, orders, and payments modules.
"""

import logging

from sqlalchemy.orm import Session

logger = logging.getLogger(__name__)


class CheckoutService:
    """Service for checkout operations."""

    def validate_cart_for_checkout(
        self, db: Session, store_id: int, session_id: str
    ) -> dict:
        """
        Validate cart is ready for checkout.

        Args:
            db: Database session
            store_id: Store ID
            session_id: Cart session ID

        Returns:
            Validation result with cart summary

        Raises:
            ValidationException: If cart is not valid for checkout
        """
        # TODO: Implement cart validation
        # - Check cart is not empty
        # - Check all products are still active
        # - Check inventory is available
        # - Calculate totals
        logger.info(
            "[CHECKOUT_SERVICE] validate_cart_for_checkout",
            extra={"store_id": store_id, "session_id": session_id},
        )
        raise NotImplementedError("Checkout service not yet implemented")

    def create_checkout_session(
        self, db: Session, store_id: int, session_id: str
    ) -> dict:
        """
        Create a checkout session from cart.

        Args:
            db: Database session
            store_id: Store ID
            session_id: Cart session ID

        Returns:
            Checkout session data
        """
        # TODO: Implement checkout session creation
        logger.info(
            "[CHECKOUT_SERVICE] create_checkout_session",
            extra={"store_id": store_id, "session_id": session_id},
        )
        raise NotImplementedError("Checkout service not yet implemented")

    def complete_checkout(
        self,
        db: Session,
        store_id: int,
        checkout_session_id: str,
        customer_id: int | None = None,
    ) -> dict:
        """
        Complete checkout and create order.

        Args:
            db: Database session
            store_id: Store ID
            checkout_session_id: Checkout session ID
            customer_id: Optional customer ID (for registered users)

        Returns:
            Created order data
        """
        # TODO: Implement checkout completion
        # - Convert cart to order
        # - Clear cart
        # - Send confirmation email
        logger.info(
            "[CHECKOUT_SERVICE] complete_checkout",
            extra={
                "store_id": store_id,
                "checkout_session_id": checkout_session_id,
                "customer_id": customer_id,
            },
        )
        raise NotImplementedError("Checkout service not yet implemented")


# Create service instance
checkout_service = CheckoutService()