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.deps import get_db
from app.core import security
from app.core.config import settings
from app.services import 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",
        )
    elif not user.is_active:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            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.post("/register", response_model=schemas.User)
def register_user(
    *,
    db: Session = Depends(get_db),
    user_in: schemas.UserCreate,
) -> Any:
    """
    Create new user
    """
    user = user_service.get_by_email(db, email=user_in.email)
    if user:
        raise HTTPException(
            status_code=400,
            detail="The user with this email already exists in the system",
        )
    username_exists = user_service.get_by_username(db, username=user_in.username)
    if username_exists:
        raise HTTPException(
            status_code=400,
            detail="The username is already taken",
        )
    user = user_service.create(db, obj_in=user_in)
    return user