from flask import (current_app, flash, redirect, request, session,
                   url_for, Blueprint)
from flask_login import login_user
from flask_oauthlib.client import OAuthException, OAuth

from models import User, db

oauth_bp = Blueprint("oauth_bp", __name__)


def zeus_login():
    return current_app.zeus.authorize(
        callback=url_for('oauth_bp.authorized', _external=True))


@oauth_bp.route('/login/zeus/authorized')
def authorized():
    resp = current_app.zeus.authorized_response()
    if resp is None:
        return 'Access denied: reason=%s error=%s' % (
            request.args['error'], request.args['error_description'])
    if isinstance(resp, OAuthException):
        return 'Access denied: %s' % resp.message + '<br>' + str(resp.data)

    session['zeus_token'] = (resp['access_token'], '')
    me = current_app.zeus.get('current_user/')
    username = me.data.get('username', '').lower()

    user = User.query.filter_by(username=username).first()
    if len(username) > 0 and user:
        return login_and_redirect_user(user)
    elif len(username) > 0:
        user = create_user(username)
        return login_and_redirect_user(user)

    flash("You're not allowed to enter, please contact a system administrator")
    return redirect(url_for("general_bp.home"))

def init_oauth(app):
    oauth = OAuth(app)

    zeus = oauth.remote_app(
        'zeus',
        consumer_key=app.config['ZEUS_KEY'],
        consumer_secret=app.config['ZEUS_SECRET'],
        request_token_params={},
        base_url='https://adams.ugent.be/oauth/api/',
        access_token_method='POST',
        access_token_url='https://adams.ugent.be/oauth/oauth2/token/',
        authorize_url='https://adams.ugent.be/oauth/oauth2/authorize/')

    @zeus.tokengetter
    def get_zeus_oauth_token():
        return session.get('zeus_token')

    return zeus


def login_and_redirect_user(user):
    login_user(user)
    return redirect(url_for("general_bp.home"))


def create_user(username):
    user = User()
    user.configure(username, False, 1)
    db.session.add(user)
    db.session.commit()
    return user