# app/api/v1/public/vendors/cart.py
"""
Shopping cart endpoints (customer-facing).
"""

import logging
from fastapi import APIRouter, Depends, Path, Body
from sqlalchemy.orm import Session
from pydantic import BaseModel, Field

from app.core.database import get_db
from app.services.cart_service import cart_service
from models.database.vendor import Vendor

router = APIRouter()
logger = logging.getLogger(__name__)


class AddToCartRequest(BaseModel):
    """Request model for adding to cart."""
    product_id: int = Field(..., description="Product ID to add")
    quantity: int = Field(1, ge=1, description="Quantity to add")


class UpdateCartItemRequest(BaseModel):
    """Request model for updating cart item."""
    quantity: int = Field(..., ge=1, description="New quantity")


@router.get("/{vendor_id}/cart/{session_id}")
def get_cart(
        vendor_id: int = Path(..., description="Vendor ID"),
        session_id: str = Path(..., description="Session ID"),
        db: Session = Depends(get_db),
):
    """
    Get shopping cart contents.

    No authentication required - uses session ID.
    """
    # Verify vendor exists
    vendor = db.query(Vendor).filter(
        Vendor.id == vendor_id,
        Vendor.is_active == True
    ).first()

    if not vendor:
        from app.exceptions import VendorNotFoundException
        raise VendorNotFoundException(str(vendor_id), identifier_type="id")

    cart = cart_service.get_cart(
        db=db,
        vendor_id=vendor_id,
        session_id=session_id
    )

    return cart


@router.post("/{vendor_id}/cart/{session_id}/items")
def add_to_cart(
        vendor_id: int = Path(..., description="Vendor ID"),
        session_id: str = Path(..., description="Session ID"),
        cart_data: AddToCartRequest = Body(...),
        db: Session = Depends(get_db),
):
    """
    Add product to cart.

    No authentication required - uses session ID.
    """
    # Verify vendor
    vendor = db.query(Vendor).filter(
        Vendor.id == vendor_id,
        Vendor.is_active == True
    ).first()

    if not vendor:
        from app.exceptions import VendorNotFoundException
        raise VendorNotFoundException(str(vendor_id), identifier_type="id")

    result = cart_service.add_to_cart(
        db=db,
        vendor_id=vendor_id,
        session_id=session_id,
        product_id=cart_data.product_id,
        quantity=cart_data.quantity
    )

    return result


@router.put("/{vendor_id}/cart/{session_id}/items/{product_id}")
def update_cart_item(
        vendor_id: int = Path(..., description="Vendor ID"),
        session_id: str = Path(..., description="Session ID"),
        product_id: int = Path(..., description="Product ID"),
        cart_data: UpdateCartItemRequest = Body(...),
        db: Session = Depends(get_db),
):
    """Update cart item quantity."""
    # Verify vendor
    vendor = db.query(Vendor).filter(
        Vendor.id == vendor_id,
        Vendor.is_active == True
    ).first()

    if not vendor:
        from app.exceptions import VendorNotFoundException
        raise VendorNotFoundException(str(vendor_id), identifier_type="id")

    result = cart_service.update_cart_item(
        db=db,
        vendor_id=vendor_id,
        session_id=session_id,
        product_id=product_id,
        quantity=cart_data.quantity
    )

    return result


@router.delete("/{vendor_id}/cart/{session_id}/items/{product_id}")
def remove_from_cart(
        vendor_id: int = Path(..., description="Vendor ID"),
        session_id: str = Path(..., description="Session ID"),
        product_id: int = Path(..., description="Product ID"),
        db: Session = Depends(get_db),
):
    """Remove item from cart."""
    # Verify vendor
    vendor = db.query(Vendor).filter(
        Vendor.id == vendor_id,
        Vendor.is_active == True
    ).first()

    if not vendor:
        from app.exceptions import VendorNotFoundException
        raise VendorNotFoundException(str(vendor_id), identifier_type="id")

    result = cart_service.remove_from_cart(
        db=db,
        vendor_id=vendor_id,
        session_id=session_id,
        product_id=product_id
    )

    return result


@router.delete("/{vendor_id}/cart/{session_id}")
def clear_cart(
        vendor_id: int = Path(..., description="Vendor ID"),
        session_id: str = Path(..., description="Session ID"),
        db: Session = Depends(get_db),
):
    """Clear all items from cart."""
    result = cart_service.clear_cart(
        db=db,
        vendor_id=vendor_id,
        session_id=session_id
    )

    return result