from datetime import timedelta
from typing import Any

from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordRequestForm
from sqlalchemy.orm import Session

from app.core.config import settings
from app.core.security import create_access_token, verify_password
from app.db.session import get_db
from app.db.models.user import User
from app.schemas.token import Token

router = APIRouter()


@router.post("/login/access-token", response_model=Token)
def login_access_token(
    db: Session = Depends(get_db),
    form_data: OAuth2PasswordRequestForm = Depends()
) -> Any:
    """
    OAuth2 compatible token login, get an access token for future requests.
    """
    # Try to authenticate with username/password
    user = db.query(User).filter(User.email == form_data.username).first()
    if not user:
        # If email doesn't match, try username
        user = db.query(User).filter(User.username == form_data.username).first()
    
    if not user or not verify_password(form_data.password, user.hashed_password):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )
    
    if not user.is_active:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Inactive user"
        )
    
    # Create access token
    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    return {
        "access_token": create_access_token(
            user.id, expires_delta=access_token_expires
        ),
        "token_type": "bearer",
    }