from datetime import timedelta
from typing import Any

from fastapi import APIRouter, Body, Depends, HTTPException
from fastapi.security import OAuth2PasswordRequestForm
from sqlalchemy.orm import Session

from backend.app import crud
from backend.app.api import deps
from backend.app.core import security
from backend.app.core.config import settings
from backend.app.core.security import get_password_hash
from backend.app.models.msg import Msg
from backend.app.models.token import Token
from backend.app.models.user import User
from backend.app.utils import (
    generate_password_reset_token,
    send_reset_password_email,
    verify_password_reset_token,
)

router = APIRouter()


@router.post("/login/access-token", 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, email=form_data.username, password=form_data.password
    )
    if not user:
        raise HTTPException(
            status_code=400, detail="Incorrect email or password"
        )
    elif not crud.user.is_active(user):
        raise HTTPException(status_code=400, 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("/login/test-token", response_model=User)
def test_token(
    current_user: User = Depends(deps.get_current_user),
) -> Any:
    """
    Test access token
    """
    return current_user


@router.post("/password-recovery/{email}", response_model=Msg)
def recover_password(email: str, db: Session = Depends(deps.get_db)) -> Any:
    """
    Password Recovery
    """
    user = crud.user.get_by_email(db, email=email)

    if not user:
        raise HTTPException(
            status_code=404,
            detail="The user with this username does not exist in the system.",
        )
    password_reset_token = generate_password_reset_token(email=email)
    send_reset_password_email(
        email_to=user.email, email=email, token=password_reset_token
    )
    return {"msg": "Password recovery email sent"}


@router.post("/reset-password/", response_model=Msg)
def reset_password(
    token: str = Body(...),
    new_password: str = Body(...),
    db: Session = Depends(deps.get_db),
) -> Any:
    """
    Reset password
    """
    email = verify_password_reset_token(token)
    if not email:
        raise HTTPException(status_code=400, detail="Invalid token")
    user = crud.user.get_by_email(db, email=email)
    if not user:
        raise HTTPException(
            status_code=404,
            detail="The user with this username does not exist in the system.",
        )
    elif not crud.user.is_active(user):
        raise HTTPException(status_code=400, detail="Inactive user")
    hashed_password = get_password_hash(new_password)
    user.hashed_password = hashed_password
    db.add(user)
    db.commit()
    return {"msg": "Password updated successfully"}