from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from app.database.database import get_db
from app.schemas.cart import CartItemCreate, CartItemUpdate, CartResponse
from app.services.cart import (
    add_to_cart,
    get_cart,
    update_cart_item,
    remove_from_cart,
    clear_cart,
)
from app.services.auth import verify_token

router = APIRouter(prefix="/api/cart", tags=["cart"])


def get_user_id_from_token(token: str) -> int:
    user_id = verify_token(token)
    if user_id is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid token",
        )
    return user_id


@router.get("", response_model=CartResponse)
def get_user_cart(token: str, db: Session = Depends(get_db)):
    user_id = get_user_id_from_token(token)
    cart = get_cart(db, user_id)
    if not cart:
        raise HTTPException(status_code=404, detail="Cart not found")
    return cart


@router.post("/add", response_model=dict)
def add_item_to_cart(token: str, item: CartItemCreate, db: Session = Depends(get_db)):
    user_id = get_user_id_from_token(token)
    cart_item = add_to_cart(db, user_id, item)
    return {"message": "Item added to cart", "item_id": cart_item.id}


@router.put("/{cart_item_id}", response_model=dict)
def update_item(
    cart_item_id: int, token: str, update: CartItemUpdate, db: Session = Depends(get_db)
):
    user_id = get_user_id_from_token(token)
    cart_item = update_cart_item(db, cart_item_id, update)
    if not cart_item:
        raise HTTPException(status_code=404, detail="Cart item not found")
    return {"message": "Item updated", "quantity": cart_item.quantity}


@router.delete("/{cart_item_id}")
def remove_item(cart_item_id: int, token: str, db: Session = Depends(get_db)):
    user_id = get_user_id_from_token(token)
    if not remove_from_cart(db, cart_item_id):
        raise HTTPException(status_code=404, detail="Cart item not found")
    return {"message": "Item removed from cart"}


@router.delete("")
def clear_user_cart(token: str, db: Session = Depends(get_db)):
    user_id = get_user_id_from_token(token)
    if not clear_cart(db, user_id):
        raise HTTPException(status_code=404, detail="Cart not found")
    return {"message": "Cart cleared"}