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 import crud, models, schemas
from app.api import deps
from app.core import security
from app.core.config import settings

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


@router.post("/register", response_model=schemas.User)
def register(
    *,
    db: Session = Depends(deps.get_db),
    user_in: schemas.UserCreate,
) -> Any:
    """
    Register a new user
    """
    # Check if user with same email exists
    user = crud.user.get_by_email(db, email=user_in.email)
    if user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="A user with this email already exists",
        )

    # Check if user with same username exists
    user = crud.user.get_by_username(db, username=user_in.username)
    if user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="A user with this username already exists",
        )

    # Create the user
    user = crud.user.create(db, obj_in=user_in)
    return user


@router.post("/login", response_model=schemas.Token)
def login_access_token(
    db: Session = Depends(deps.get_db),
    form_data: OAuth2PasswordRequestForm = Depends(),
) -> Any:
    """
    OAuth2 compatible token login, get an access token for future requests
    """
    user = crud.user.authenticate(db, email=form_data.username, password=form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect email or password",
        )
    if not crud.user.is_active(user):
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Inactive user")

    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    return {
        "access_token": security.create_access_token(user.id, expires_delta=access_token_expires),
        "token_type": "bearer",
    }


@router.get("/me", response_model=schemas.User)
def read_users_me(
    current_user: models.User = Depends(deps.get_current_active_user),
) -> Any:
    """
    Get current user
    """
    return current_user