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.core.auth import get_current_user
from app.core.config import settings
from app.core.security import create_access_token, get_password_hash, verify_password
from app.db.session import get_db
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("/auth/signup", response_model=UserSchema)
def create_user(
    user_in: UserCreate,
    db: Session = Depends(get_db)
) -> Any:
    """Create a new user
    """
    # Check if user with this email or username already exists
    user = db.query(User).filter(
        (User.email == user_in.email) | (User.username == user_in.username)
    ).first()
    if user:
        if user.email == user_in.email:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="Email already registered"
            )
        else:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="Username already taken"
            )

    # Create new user
    user = User(
        email=user_in.email,
        username=user_in.username,
        hashed_password=get_password_hash(user_in.password),
        is_active=True
    )
    db.add(user)
    db.commit()
    db.refresh(user)

    return user


@router.post("/auth/login", response_model=Token)
def login_access_token(
    form_data: OAuth2PasswordRequestForm = Depends(),
    db: Session = Depends(get_db)
) -> Any:
    """Get the JWT for a user with data from OAuth2 request form body
    """
    # Try to authenticate with username
    user = db.query(User).filter(User.username == form_data.username).first()

    # If user not found by username, try email
    if not user:
        user = db.query(User).filter(User.email == form_data.username).first()

    if not user or not verify_password(form_data.password, user.hashed_password):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )

    # If user is not active
    if not user.is_active:
        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.id, expires_delta=access_token_expires
        ),
        "token_type": "bearer",
    }


@router.post("/auth/logout", status_code=status.HTTP_204_NO_CONTENT, response_model=None)
def logout(
    _: User = Depends(get_current_user),
) -> None:
    """Logout a user (JWT token should be invalidated client-side)
    """
    # JWT is stateless, so nothing to do on server-side for logout
    # Client should remove the token
    return None


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