/*
 * Copyright 2017-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with
 * the License. A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
 * and limitations under the License.
 */

 import * as React from 'react';
 import { Component } from 'react';

import { ConsoleLogger as Logger } from '@aws-amplify/core';
import Auth from '@aws-amplify/auth';
import AmplifyTheme from '../../Amplify-UI/Amplify-UI-Theme';
// import auth0 from 'auth0-js';
import { auth0SignInButton } from '@aws-amplify/ui';
import {
    SignInButton,
    SignInButtonIcon,
    SignInButtonContent
} from '../../Amplify-UI/Amplify-UI-Components-React';
import Constants from '../common/constants';


const logger = new Logger('withAuth0');

export default function withAuth0(Comp, options) {
    return class extends Component {
        constructor(props) {
            super(props);
            this._auth0 = null;

            this.initialize = this.initialize.bind(this);
            this.signIn = this.signIn.bind(this);
            this.signOut = this.signOut.bind(this);
        }

        componentDidMount() {
            if (!window.auth0) {
                this.createScript();
            } else {
                this.initialize();
            }
        }

        createScript() {
            const script = document.createElement('script');
            script.src = 'https://cdn.auth0.com/js/auth0/9.8.1/auth0.min.js';
            script.async = true;
            script.onload = this.initialize;
            document.body.appendChild(script);
        }

        initialize() {
            const { oauth = {} } = Auth.configure();
            const config = this.props.auth0 || options || oauth.auth0;
            const { onError, onStateChange, authState, onAuthEvent } = this.props;
            if (!config) {
                logger.debug('Auth0 is not configured');
                return;
            }

            logger.debug('withAuth0 configuration', config);

            if (!this._auth0) {
                this._auth0 = new window['auth0'].WebAuth(config);
                window.auth0_client = this._auth0;
            }
            
            if (authState !== 'signedIn') {
                this._auth0.parseHash((err, authResult) => {
                    if (err || !authResult) {
                        logger.debug('Failed to parse the url for Auth0', err);
                        return;
                    }
                    const payload = {
                        provider: Constants.AUTH0,
                        opts: {
                            returnTo: config.returnTo,
                            clientID: config.clientID,
                            federated: config.federated
                        }
                    };

                    try {
                        localStorage.setItem(Constants.AUTH_SOURCE_KEY, JSON.stringify(payload));
                    } catch (e) {
                        logger.debug('Failed to cache auth source into localStorage', e);
                    }
              
                    this._auth0.client.userInfo(authResult.accessToken, (err, user) => {
                        let username = undefined;
                        let email = undefined;
                        if (err) {
                            logger.debug('Failed to get the user info', err);
                        } else {
                            username = user.name;
                            email = user.email;
                        }

                        Auth.federatedSignIn(
                            config.domain,
                            {
                                token: authResult.idToken,
                                expires_at: authResult.expiresIn * 1000 + new Date().getTime()
                            },
                            { name: username, email }
                        ).then((cred) => {
                            if (onStateChange) {
                                Auth.currentAuthenticatedUser().then(user => {
                                    onStateChange('signedIn', user);
                                });
                            }
                        }).catch((e) => {
                            logger.debug('Failed to get the aws credentials', e);
                            if (onError) onError(e);
                        });
                    });
                });
            }
        }

        async signIn() {
            if (this._auth0) this._auth0.authorize();
            else {
                throw new Error('the auth0 client is not configured');
            }
        }

        signOut(opts={}) {
            const auth0 = window.auth0_client;
            const { returnTo, clientID, federated } = opts;
            if (!auth0) {
                logger.debug('auth0 sdk undefined');
                return Promise.resolve();
            }
            auth0.logout({
                returnTo,
                clientID,
                federated
            });
        }

        render() {
            return <Comp {...this.props} auth0={this._auth0} auth0SignIn={this.signIn} auth0SignOut={this.signOut}/>;
        }
    };
}

const Button = props => (
    <SignInButton
        id={auth0SignInButton}
        onClick={props.auth0SignIn}
        theme={props.theme || AmplifyTheme}
        variant={'auth0SignInButton'}
    >
        <SignInButtonIcon theme={props.theme || AmplifyTheme}>
            <svg id='artwork' xmlns='http://www.w3.org/2000/svg' viewBox='0 0 193.7 216.6'>
                <path id='NEW' className='st0' d='M189,66.9L167.2,0H96.8l21.8,66.9H189z M96.8,0H26.5L4.8,66.9h70.4L96.8,0z M4.8,66.9L4.8,66.9	c-13,39.9,1.2,83.6,35.2,108.3l21.7-66.9L4.8,66.9z M189,66.9L189,66.9l-57,41.4l21.7,66.9l0,0C187.7,150.6,201.9,106.8,189,66.9	L189,66.9z M39.9,175.2L39.9,175.2l56.9,41.4l56.9-41.4l-56.9-41.4L39.9,175.2z'/>
            </svg>
        </SignInButtonIcon>
        <SignInButtonContent theme={props.theme || AmplifyTheme}>
            {props.label || 'Sign In with Auth0'}
        </SignInButtonContent>
    </SignInButton>
);

export const Auth0Button = withAuth0(Button);