"""
API dependencies.
"""
from typing import Annotated, Optional

from fastapi import Cookie, Depends, HTTPException, Request, status
from fastapi.security import OAuth2PasswordBearer
from sqlalchemy.orm import Session

from app.core.database import get_db
from app.core.security import decode_access_token
from app.models.user import User

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login", auto_error=False)


async def get_current_user(
    request: Request,
    db: Annotated[Session, Depends(get_db)],
    bearer_token: Annotated[Optional[str], Depends(oauth2_scheme)] = None,
) -> User:
    """Get the current authenticated user.

    Token extraction order: httpOnly cookie first, then Authorization header fallback.
    """
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )

    # Cookie first, then Authorization header fallback
    token = request.cookies.get("access_token") or bearer_token
    if token is None:
        raise credentials_exception

    payload = decode_access_token(token)
    if payload is None:
        raise credentials_exception

    username: str = payload.get("sub")
    if username is None:
        raise credentials_exception

    user = db.query(User).filter(User.username == username).first()
    if user is None:
        raise credentials_exception

    return user


CurrentUser = Annotated[User, Depends(get_current_user)]
DbSession = Annotated[Session, Depends(get_db)]