from __future__ import annotations

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 schemas
from app.api import deps
from app.core import security
from app.core.config import settings
from app.db.session import get_db
from app.services.user import user as user_service

router = APIRouter()


@router.post("/login", response_model=schemas.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.
    """
    user = user_service.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",
            headers={"WWW-Authenticate": "Bearer"},
        )
    if not user_service.is_active(user):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Inactive user",
            headers={"WWW-Authenticate": "Bearer"},
        )

    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.post("/register", response_model=schemas.User)
def register_user(
    *,
    db: Session = Depends(get_db),
    user_in: schemas.UserCreate,
) -> Any:
    """
    Register a new user.
    """
    user = user_service.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",
        )

    user = user_service.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",
        )

    user = user_service.create(db, obj_in=user_in)
    return user


@router.post("/test-token", response_model=schemas.User)
def test_token(current_user: schemas.User = Depends(deps.get_current_user)) -> Any:
    """
    Test access token.
    """
    return current_user