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 import deps
from app.core.config import settings
from app.core.security import create_access_token
from app.models.user import User
from app.schemas.token import Token
from app.schemas.user import User as UserSchema
from app.schemas.user import UserCreate

router = APIRouter()


@router.post("/login", response_model=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, username=form_data.username, password=form_data.password
    )
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )
    elif 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": create_access_token(
            user.username, expires_delta=access_token_expires
        ),
        "token_type": "bearer",
    }


@router.post("/register", response_model=UserSchema, status_code=status.HTTP_201_CREATED)
def register_user(
    *,
    db: Session = Depends(deps.get_db),
    user_in: UserCreate,
) -> Any:
    """
    Register a new user.
    """
    # Check if user with the same 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="User with this email already exists",
        )
    
    # Check if user with the same 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="User with this username already exists",
        )
    
    # Create new user (non-superuser by default)
    user_in.is_superuser = False
    user = crud.user.create(db, obj_in=user_in)
    return user


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