from datetime import datetime
from fastapi import HTTPException
from passlib.context import CryptContext

from app.schemas import *
from database import SessionLocal
from database.models import *


pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def instantiate_model(model, data):
    table = eval(model)
    instance = table(**data.dict())
    return instance


def insert_data(model, data, db):
    item = instantiate_model(model=model, data=data)
    db.add(item)
    db.commit()
    db.refresh(item)
    return item


# FIXME db.id has to be replaced with the table's UID
def delete_data(model, data, db):
    item = instantiate_model(model=model, data=data)
    result = db.query(item).filter(item.email == data.email).delete()
    return result


def fetch_user_by_key(data, db):
    return db.query(Users).filter(Users.access_key == data.access_key).first()


def fetch_user_by_email(data, db):
    return db.query(Users).filter(Users.email == data.email).first()


def create_user(data, db):
    data.password = pwd_context.hash(data.password)
    user = insert_data(model="Users", data=data, db=db)
    return user


def update_otp(data: OTPResend, db):
    db.query(Users).filter(Users.email == data.email).update(
        {Users.otp: data.otp, Users.otp_valid_time: data.otp_valid_time}
    )
    db.commit()


    )
    return user


def activate_account(user, db):
    db.query(Users).filter(Users.access_key == user.access_key).update(
        {Users.status: 1}
    )
    db.commit()
    db.refresh(user)


def verify_otp(data: OTPVerify, db):
    user = fetch_user_by_key(data=data, db=db)
    matching_otp = user.otp == data.otp
    valid_time = datetime.now() < user.otp_valid_time
    valid_otp = matching_otp and valid_time
    if valid_otp:
        activate_account(user=user, db=db)
        return user
    else:
        raise HTTPException(status_code=400, detail="The OTP is not correct")