import datetime as dt

from apistar import Component, Settings, http, Route, Include, annotate
from apistar.interfaces import Auth
from apistar.backends.sqlalchemy_backend import Session
from apistar_jwt.authentication import get_jwt, JWTAuthentication
from apistar_jwt.token import JWT
from apistar_mail import Message, Mail
from sqlalchemy.exc import IntegrityError, InvalidRequestError
from sqlalchemy.orm.exc import NoResultFound

from cookie_api.models import User
from cookie_api.schema import UserSchema, UserCreateSchema

auth_components = [
    Component(JWT, init=get_jwt)
]


def login(settings: Settings, json_data: http.RequestData, session: Session):
    user_id = json_data.get('email')
    password = json_data.get('password')

    try:
        user = session.query(User).filter_by(email=user_id).one()

    except NoResultFound:
        error = {
            'status': 'fail',
            'message': 'User does not exist'
        }
        return http.Response(error, status=400, headers={'WWW-Authenticate': 'Bearer'})

    if not user.check_password(password):
        error = {'error': 'Password auth failed'},
        return http.Response(error, status=401, headers={'WWW-Authenticate': 'Bearer'})

    secret = settings['JWT'].get('SECRET')

    payload = {
        'exp': dt.datetime.utcnow() + dt.timedelta(days=0, minutes=60),  # Expiration date of the token
        'iat': dt.datetime.utcnow(),  # the time the token was generated
        'sub': user.id  # the subject of the token
    }

    token = JWT.encode(payload, secret=secret)

    data = {
        'status': 'success',
        'message': 'Successfully logged in.',
        'auth_token': token
    }

    return data


# TODO Add user logout
def logout():
    pass


# TODO Add user registration
def register(user_rep: UserCreateSchema, session: Session, mail: Mail):
    email_check = session.query(User).filter_by(email=user_rep['email']).one_or_none()

    if email_check is not None:
        message = {
            'status': 'error',
            'message': 'user email address is already in use'
        }
        return http.Response(message, status=400)

    user = User(email=user_rep['email'], password=user_rep['password'])

    session.add(user)
    session.commit()

    msg = Message("Thank you for registering please confirm your email", recipients=[user_rep['email']])
    mail.send(msg)

    headers = {}
    message = {
        'status': 'success',
        'message': 'Please check your inbox and confirm your email'
    }
    return http.Response(message, status=201, headers=headers)


@annotate(authentication=[JWTAuthentication()])
def user_profile(auth: Auth, settings: Settings, session: Session) -> UserSchema:
    token = JWT(token=auth.token, settings=settings)
    user_id = token.payload.get('sub')
    user = session.query(User).filter_by(id=user_id).one()
    return UserSchema(user)

# TODO Add email confirmation
def confirm(json_data: http.RequestData, session: Session):
    pass


# TODO Add email password reset
def reset():
    pass


routes = [
    Route('/login', 'POST', login),
    Route('/register', 'POST', register),
    Route('/status', 'GET', user_profile)
]

auth_routes = [Include('/auth', routes)]