// Converse.js
// https://conversejs.org
//
// Copyright (c) 2013-2018, the Converse.js developers
// Licensed under the Mozilla Public License (MPLv2)

(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as a module called "myplugin"
        define(["@converse/headless/converse-core", "templates/oauth_providers.html", "hellojs"], factory);
    } else {
        // Browser globals. If you're not using a module loader such as require.js,
        // then this line below executes. Make sure that your plugin's <script> tag
        // appears after the one from converse.js.
        factory(converse);
    }
}(this, function (converse, tpl_oauth_providers, hello) {
    'use strict';
    const _ = converse.env._,
          Backbone = converse.env.Backbone,
          Strophe = converse.env.Strophe;

    // The following line registers your plugin.
    converse.plugins.add("converse-oauth", {

        /* Optional dependencies are other plugins which might be
         * overridden or relied upon, and therefore need to be loaded before
         * this plugin. They are called "optional" because they might not be
         * available, in which case any overrides applicable to them will be
         * ignored.
         *
         * NB: These plugins need to have already been loaded via require.js.
         *
         * It's possible to make optional dependencies non-optional.
         * If the setting "strict_plugin_dependencies" is set to true,
         * an error will be raised if the plugin is not found.
         */
        'optional_dependencies': ['converse-register'],

        /* If you want to override some function or a Backbone model or
         * view defined elsewhere in converse.js, then you do that under
         * the "overrides" namespace.
         */
        'overrides': {
            /* For example, the private *_converse* object has a
             * method "onConnected". You can override that method as follows:
             */
            'LoginPanel': {

                insertOAuthProviders () {
                    const { _converse } = this.__super__;
                    if (_.isUndefined(this.oauth_providers_view)) {
                        this.oauth_providers_view = 
                            new _converse.OAuthProvidersView({'model': _converse.oauth_providers});

                        this.oauth_providers_view.render();
                        this.el.querySelector('.buttons').insertAdjacentElement(
                            'afterend',
                            this.oauth_providers_view.el
                        );
                    }
                    this.oauth_providers_view.render();
                },

                render (cfg) {
                    const { _converse } = this.__super__;
                    const result = this.__super__.render.apply(this, arguments);
                    if (_converse.oauth_providers && !_converse.auto_login) {
                        this.insertOAuthProviders();
                    }
                    return result;
                }
            }
        },

        initialize () {
            /* The initialize function gets called as soon as the plugin is
             * loaded by converse.js's plugin machinery.
             */
            const { _converse } = this,
                  { __ } = _converse;

            _converse.api.settings.update({
                'oauth_providers': {},
            });

            _converse.OAuthProviders = Backbone.Collection.extend({
                'sync': __.noop,

                initialize () {
                    _.each(_converse.user_settings.oauth_providers, (provider) => {
                        const item = new Backbone.Model(_.extend(provider, {
                            'login_text': __('Log in with %1$s', provider.name)
                        }));
                        this.add(item, {'silent': true});
                    });
                }
            });
            _converse.oauth_providers = new _converse.OAuthProviders();


            _converse.OAuthProvidersView = Backbone.VDOMView.extend({
                'events': {
                    'click .oauth-login': 'oauthLogin'
                },

                toHTML () {
                    return tpl_oauth_providers(
                        _.extend({
                            '_': _,
                            '__': _converse.__,
                            'providers': this.model.toJSON()
                        }));
                },

                fetchOAuthProfileDataAndLogin () {
                    this.oauth_service.api('me').then((profile) => {
                        const response = this.oauth_service.getAuthResponse();
                        _converse.api.user.login({
                            'jid': `${profile.name}@${this.provider.get('host')}`,
                            'password': response.access_token
                        });
                    });
                },

                oauthLogin (ev) {
                    ev.preventDefault();
                    const id = ev.target.getAttribute('data-id');
                    this.provider = _converse.oauth_providers.get(id);
                    this.oauth_service = hello(id);

                    const data = {};
                    data[id] = this.provider.get('client_id');
                    hello.init(data, {
                        'redirect_uri': '/redirect.html'
                    });

                    this.oauth_service.login().then(
                        () => this.fetchOAuthProfileDataAndLogin(),
                        (error) => _converse.log(error.error_message, Strophe.LogLevel.ERROR)
                    );
                }
            });
        }
    });
}));