/*
Copyright 2017 Vector Creations Ltd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License 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.
*/

'use strict';

import React from 'react';
import MatrixClientPeg from '../../../MatrixClientPeg';
import AppTile from '../elements/AppTile';
import Modal from '../../../Modal';
import dis from '../../../dispatcher';
import sdk from '../../../index';
import SdkConfig from '../../../SdkConfig';
import ScalarAuthClient from '../../../ScalarAuthClient';
import ScalarMessaging from '../../../ScalarMessaging';
import { _t } from '../../../languageHandler';


module.exports = React.createClass({
    displayName: 'AppsDrawer',

    propTypes: {
        room: React.PropTypes.object.isRequired,
    },

    getInitialState: function() {
        return {
            apps: this._getApps(),
        };
    },

    componentWillMount: function() {
        ScalarMessaging.startListening();
        MatrixClientPeg.get().on("RoomState.events", this.onRoomStateEvents);
    },

    componentDidMount: function() {
        this.scalarClient = null;
        if (SdkConfig.get().integrations_ui_url && SdkConfig.get().integrations_rest_url) {
            this.scalarClient = new ScalarAuthClient();
            this.scalarClient.connect().done(() => {
                this.forceUpdate();
                if (this.state.apps && this.state.apps.length < 1) {
                    this.onClickAddWidget();
                }
            // TODO -- Handle Scalar errors
            // },
            // (err) => {
            //     this.setState({
            //         scalar_error: err,
            //     });
            });
        }
    },

    componentWillUnmount: function() {
        ScalarMessaging.stopListening();
        if (MatrixClientPeg.get()) {
            MatrixClientPeg.get().removeListener("RoomState.events", this.onRoomStateEvents);
        }
    },

    /**
     * Encodes a URI according to a set of template variables. Variables will be
     * passed through encodeURIComponent.
     * @param {string} pathTemplate The path with template variables e.g. '/foo/$bar'.
     * @param {Object} variables The key/value pairs to replace the template
     * variables with. E.g. { "$bar": "baz" }.
     * @return {string} The result of replacing all template variables e.g. '/foo/baz'.
     */
    encodeUri: function(pathTemplate, variables) {
        for (const key in variables) {
            if (!variables.hasOwnProperty(key)) {
                continue;
            }
            pathTemplate = pathTemplate.replace(
                key, encodeURIComponent(variables[key]),
            );
        }
        return pathTemplate;
    },

    _initAppConfig: function(appId, app) {
        const user = MatrixClientPeg.get().getUser(this.props.userId);
        const params = {
            '$matrix_user_id': this.props.userId,
            '$matrix_room_id': this.props.room.roomId,
            '$matrix_display_name': user ? user.displayName : this.props.userId,
            '$matrix_avatar_url': user ? MatrixClientPeg.get().mxcUrlToHttp(user.avatarUrl) : '',
        };

        if(app.data) {
            Object.keys(app.data).forEach((key) => {
                params['$' + key] = app.data[key];
            });
        }

        app.id = appId;
        app.name = app.name || app.type;
        app.url = this.encodeUri(app.url, params);

        return app;
    },

    onRoomStateEvents: function(ev, state) {
        if (ev.getRoomId() !== this.props.room.roomId || ev.getType() !== 'im.vector.modular.widgets') {
            return;
        }
        this._updateApps();
    },

    _getApps: function() {
        const appsStateEvents = this.props.room.currentState.getStateEvents('im.vector.modular.widgets');
        if (!appsStateEvents) {
            return [];
        }

        return appsStateEvents.filter((ev) => {
            return ev.getContent().type && ev.getContent().url;
        }).map((ev) => {
            return this._initAppConfig(ev.getStateKey(), ev.getContent());
        });
    },

    _updateApps: function() {
        const apps = this._getApps();
        if (apps.length < 1) {
            dis.dispatch({
                action: 'appsDrawer',
                show: false,
            });
        }
        this.setState({
            apps: apps,
        });
    },

    onClickAddWidget: function(e) {
        if (e) {
            e.preventDefault();
        }

        const IntegrationsManager = sdk.getComponent("views.settings.IntegrationsManager");
        const src = (this.scalarClient !== null && this.scalarClient.hasCredentials()) ?
                this.scalarClient.getScalarInterfaceUrlForRoom(this.props.room.roomId, 'add_integ') :
                null;
        Modal.createDialog(IntegrationsManager, {
            src: src,
        }, "mx_IntegrationsManager");
    },

    render: function() {
        const apps = this.state.apps.map(
            (app, index, arr) => {
                return (<AppTile
                    key={app.id}
                    id={app.id}
                    url={app.url}
                    name={app.name}
                    type={app.type}
                    fullWidth={arr.length<2 ? true : false}
                    room={this.props.room}
                    userId={this.props.userId}
                />);
            });

        const addWidget = this.state.apps && this.state.apps.length < 2 &&
            (<div onClick={this.onClickAddWidget}
                            role="button"
                            tabIndex="0"
                            className="mx_AddWidget_button"
                            title={_t('Add a widget')}>
                            [+] {_t('Add a widget')}
                        </div>);

        return (
            <div className="mx_AppsDrawer">
                <div id="apps" className="mx_AppsContainer">
                    {apps}
                </div>
                {addWidget}
            </div>
        );
    },
});