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
from app.api.deps import get_db, get_current_active_user
from app.core.config import settings
from app.core.security import create_access_token
from app.models.user import User
from app.schemas.user import User as UserSchema
from app.schemas.user import UserCreate, Token

router = APIRouter()


@router.post("/register", response_model=UserSchema)
def register(
    *,
    db: Session = Depends(get_db),
    user_in: UserCreate,
) -> Any:
    """
    Register a new user.
    """
    # Check if user with this email already 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 this username already 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 new user
    user = crud.user.create(db, obj_in=user_in)
    return user


@router.post("/login", response_model=Token)
def login(
    db: Session = Depends(get_db),
    form_data: OAuth2PasswordRequestForm = Depends(),
) -> Any:
    """
    OAuth2 compatible token login, get an access token for future requests.
    """
    user = crud.user.authenticate(
        db, email_or_username=form_data.username, password=form_data.password
    )
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect email/username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )

    if not crud.user.is_active(user):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Inactive user",
        )

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


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


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