/*
Copyright 2015, 2016 OpenMarket 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.
*/
var React = require('react');
var Matrix = require("matrix-js-sdk");
var url = require('url');
var Favico = require('favico.js');

var MatrixClientPeg = require("../../MatrixClientPeg");
var Notifier = require("../../Notifier");
var ContextualMenu = require("../../ContextualMenu");
var RoomListSorter = require("../../RoomListSorter");
var UserActivity = require("../../UserActivity");
var Presence = require("../../Presence");
var dis = require("../../dispatcher");

var Login = require("./login/Login");
var Registration = require("./login/Registration");
var PostRegistration = require("./login/PostRegistration");

var Modal = require("../../Modal");
var Tinter = require("../../Tinter");
var sdk = require('../../index');
var MatrixTools = require('../../MatrixTools');
var linkifyMatrix = require("../../linkify-matrix");

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

    propTypes: {
        config: React.PropTypes.object.isRequired,
        ConferenceHandler: React.PropTypes.any,
        onNewScreen: React.PropTypes.func,
        registrationUrl: React.PropTypes.string,
        enableGuest: React.PropTypes.bool,
        startingQueryParams: React.PropTypes.object
    },

    PageTypes: {
        RoomView: "room_view",
        UserSettings: "user_settings",
        CreateRoom: "create_room",
        RoomDirectory: "room_directory",
    },

    AuxPanel: {
        RoomSettings: "room_settings",
    },

    getInitialState: function() {
        var s = {
            logged_in: !!(MatrixClientPeg.get() && MatrixClientPeg.get().credentials),
            collapse_lhs: false,
            collapse_rhs: false,
            ready: false,
            width: 10000,
        };
        if (s.logged_in) {
            if (MatrixClientPeg.get().getRooms().length) {
                s.page_type = this.PageTypes.RoomView;
            } else {
                // we don't need to default to the directoy here
                // as we'll go there anyway after syncing
                // s.page_type = this.PageTypes.RoomDirectory;
            }
        }
        return s;
    },

    getDefaultProps: function() {
        return {
            startingQueryParams: {}
        };
    },

    componentWillMount: function() {
        this.favicon = new Favico({animation: 'none'});
    },

    componentDidMount: function() {
        this._autoRegisterAsGuest = false;
        if (this.props.enableGuest) {
            if (!this.props.config || !this.props.config.default_hs_url) {
                console.error("Cannot enable guest access: No supplied config prop for HS/IS URLs");
            }
            else if (this.props.startingQueryParams.client_secret && this.props.startingQueryParams.sid) {
                console.log("Not registering as guest; registration.");
                this._autoRegisterAsGuest = false;
            }
            else {
                this._autoRegisterAsGuest = true;
            }
        }

        this.dispatcherRef = dis.register(this.onAction);
        if (this.state.logged_in) {
            // Don't auto-register as a guest. This applies if you refresh the page on a
            // logged in client THEN hit the Sign Out button.
            this._autoRegisterAsGuest = false;
            this.startMatrixClient();
        }
        this.focusComposer = false;
        // scrollStateMap is a map from room id to the scroll state returned by
        // RoomView.getScrollState()
        this.scrollStateMap = {};
        document.addEventListener("keydown", this.onKeyDown);
        window.addEventListener("focus", this.onFocus);

        if (this.state.logged_in) {
            this.notifyNewScreen('');
        } else if (this._autoRegisterAsGuest) {
            this._registerAsGuest();
        } else {
            this.notifyNewScreen('login');
        }

        // this can technically be done anywhere but doing this here keeps all
        // the routing url path logic together.
        if (this.onAliasClick) {
            linkifyMatrix.onAliasClick = this.onAliasClick;
        }
        if (this.onUserClick) {
            linkifyMatrix.onUserClick = this.onUserClick;
        }

        window.addEventListener('resize', this.handleResize);
        this.handleResize();
    },

    componentWillUnmount: function() {
        dis.unregister(this.dispatcherRef);
        document.removeEventListener("keydown", this.onKeyDown);
        window.removeEventListener("focus", this.onFocus);
        window.removeEventListener('resize', this.handleResize);
    },

    componentDidUpdate: function() {
        if (this.focusComposer) {
            dis.dispatch({action: 'focus_composer'});
            this.focusComposer = false;
        }
    },

    _registerAsGuest: function() {
        var self = this;
        var config = this.props.config;
        console.log("Doing guest login on %s", config.default_hs_url);
        MatrixClientPeg.replaceUsingUrls(
            config.default_hs_url, config.default_is_url
        );
        MatrixClientPeg.get().registerGuest().done(function(creds) {
            console.log("Registered as guest: %s", creds.user_id);
            self._setAutoRegisterAsGuest(false);
            self.onLoggedIn({
                userId: creds.user_id,
                accessToken: creds.access_token,
                homeserverUrl: config.default_hs_url,
                identityServerUrl: config.default_is_url,
                guest: true
            });
        }, function(err) {
            console.error("Failed to register as guest: " + err + " " + err.data);
            self._setAutoRegisterAsGuest(false);
        });
    },

    _setAutoRegisterAsGuest: function(shouldAutoRegister) {
        this._autoRegisterAsGuest = shouldAutoRegister;
        this.forceUpdate();
    },

    onAction: function(payload) {
        var roomIndexDelta = 1;

        var self = this;
        switch (payload.action) {
            case 'logout':
                if (window.localStorage) {
                    window.localStorage.clear();
                }
                Notifier.stop();
                UserActivity.stop();
                Presence.stop();
                MatrixClientPeg.get().stopClient();
                MatrixClientPeg.get().removeAllListeners();
                MatrixClientPeg.unset();
                this.notifyNewScreen('login');
                this.replaceState({
                    logged_in: false,
                    ready: false
                });
                break;
            case 'start_registration':
                var newState = payload.params || {};
                newState.screen = 'register';
                if (
                    payload.params &&
                    payload.params.client_secret &&
                    payload.params.session_id &&
                    payload.params.hs_url &&
                    payload.params.is_url &&
                    payload.params.sid
                ) {
                    newState.register_client_secret = payload.params.client_secret;
                    newState.register_session_id = payload.params.session_id;
                    newState.register_hs_url = payload.params.hs_url;
                    newState.register_is_url = payload.params.is_url;
                    newState.register_id_sid = payload.params.sid;
                }
                this.replaceState(newState);
                this.notifyNewScreen('register');
                break;
            case 'start_login':
                if (this.state.logged_in) return;
                this.replaceState({
                    screen: 'login'
                });
                this.notifyNewScreen('login');
                break;
            case 'start_post_registration':
                this.setState({ // don't clobber logged_in status
                    screen: 'post_registration'
                });
                break;
            case 'start_upgrade_registration':
                this.replaceState({
                    screen: "register",
                    upgradeUsername: MatrixClientPeg.get().getUserIdLocalpart(),
                    guestAccessToken: MatrixClientPeg.get().getAccessToken()
                });
                this.notifyNewScreen('register');
                break;
            case 'start_password_recovery':
                if (this.state.logged_in) return;
                this.replaceState({
                    screen: 'forgot_password'
                });
                this.notifyNewScreen('forgot_password');
                break;
            case 'token_login':
                if (this.state.logged_in) return;

                var self = this;
                MatrixClientPeg.replaceUsingUrls(
                    payload.params.homeserver,
                    payload.params.identityServer
                );

                var client = MatrixClientPeg.get();
                client.loginWithToken(payload.params.loginToken).done(function(data) {
                    MatrixClientPeg.replaceUsingAccessToken(
                        client.getHomeserverUrl(), client.getIdentityServerUrl(),
                        data.user_id, data.access_token
                    );
                    self.setState({
                        screen: undefined,
                        logged_in: true
                    });

                    // We're left with the login token, hs and is url as query params
                    // in the url, a little nasty but let's redirect to clear them
                    var parsedUrl = url.parse(window.location.href);
                    parsedUrl.search = "";
                    window.location.href = url.format(parsedUrl);

                }, function(error) {
                    self.notifyNewScreen('login');
                    self.setState({errorText: 'Login failed.'});
                });

                break;
            case 'leave_room':
                var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
                var QuestionDialog = sdk.getComponent("dialogs.QuestionDialog");

                var roomId = payload.room_id;
                Modal.createDialog(QuestionDialog, {
                    title: "Leave room",
                    description: "Are you sure you want to leave the room?",
                    onFinished: function(should_leave) {
                        if (should_leave) {
                            var d = MatrixClientPeg.get().leave(roomId);
                            
                            // FIXME: controller shouldn't be loading a view :(
                            var Loader = sdk.getComponent("elements.Spinner");
                            var modal = Modal.createDialog(Loader);

                            d.then(function() {
                                modal.close();
                                dis.dispatch({action: 'view_next_room'});
                            }, function(err) {
                                modal.close();
                                Modal.createDialog(ErrorDialog, {
                                    title: "Failed to leave room",
                                    description: err.toString()
                                });
                            });
                        }
                    }
                });
                break;
            case 'view_room':
                this._viewRoom(payload.room_id, payload.show_settings, payload.event_id, payload.invite_sign_url);
                break;
            case 'view_prev_room':
                roomIndexDelta = -1;
            case 'view_next_room':
                var allRooms = RoomListSorter.mostRecentActivityFirst(
                    MatrixClientPeg.get().getRooms()
                );
                var roomIndex = -1;
                for (var i = 0; i < allRooms.length; ++i) {
                    if (allRooms[i].roomId == this.state.currentRoom) {
                        roomIndex = i;
                        break;
                    }
                }
                roomIndex = (roomIndex + roomIndexDelta) % allRooms.length;
                if (roomIndex < 0) roomIndex = allRooms.length - 1;
                this._viewRoom(allRooms[roomIndex].roomId);
                break;
            case 'view_indexed_room':
                var allRooms = RoomListSorter.mostRecentActivityFirst(
                    MatrixClientPeg.get().getRooms()
                );
                var roomIndex = payload.roomIndex;
                if (allRooms[roomIndex]) {
                    this._viewRoom(allRooms[roomIndex].roomId);
                }
                break;
            case 'view_room_alias':
                var foundRoom = MatrixTools.getRoomForAlias(
                    MatrixClientPeg.get().getRooms(), payload.room_alias
                );
                if (foundRoom) {
                    dis.dispatch({
                        action: 'view_room',
                        room_id: foundRoom.roomId,
                        event_id: payload.event_id,
                        invite_sign_url: payload.invite_sign_url,
                    });
                    return;
                }
                // resolve the alias and *then* view it
                MatrixClientPeg.get().getRoomIdForAlias(payload.room_alias).done(
                function(result) {
                    dis.dispatch({
                        action: 'view_room',
                        room_id: result.room_id,
                        event_id: payload.event_id,
                        invite_sign_url: payload.invite_sign_url,
                    });
                });
                break;
            case 'view_user_settings':
                this._setPage(this.PageTypes.UserSettings);
                this.notifyNewScreen('settings');
                break;
            case 'view_create_room':
                //this._setPage(this.PageTypes.CreateRoom);
                //this.notifyNewScreen('new');

                var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
                var Loader = sdk.getComponent("elements.Spinner");
                var modal = Modal.createDialog(Loader);

                MatrixClientPeg.get().createRoom({
                    preset: "private_chat",
                    // Allow guests by default since the room is private and they'd
                    // need an invite. This means clicking on a 3pid invite email can
                    // actually drop you right in to a chat.
                    initial_state: [
                        {
                            content: {
                                guest_access: 'can_join'
                            },
                            type: 'm.room.guest_access',
                            state_key: '',
                        }
                    ],
                }).done(function(res) {
                    modal.close();
                    dis.dispatch({
                        action: 'view_room',
                        room_id: res.room_id,
                        // show_settings: true,
                    });
                }, function(err) {
                    modal.close();
                    Modal.createDialog(ErrorDialog, {
                        title: "Failed to create room",
                        description: err.toString()
                    });
                });
                break;
            case 'view_room_directory':
                this._setPage(this.PageTypes.RoomDirectory);
                this.notifyNewScreen('directory');
                break;
            case 'notifier_enabled':
                this.forceUpdate();
                break;
            case 'hide_left_panel':
                this.setState({
                    collapse_lhs: true,
                });
                break;
            case 'show_left_panel':
                this.setState({
                    collapse_lhs: false,
                });
                break;
            case 'hide_right_panel':
                this.setState({
                    collapse_rhs: true,
                });
                break;
            case 'show_right_panel':
                this.setState({
                    collapse_rhs: false,
                });
                break;
        }
    },

    _setPage: function(pageType) {
        // record the scroll state if we're in a room view.
        this._updateScrollMap();

        this.setState({
            page_type: pageType,
        });
    },

    // switch view to the given room
    //
    // eventId is optional and will cause a switch to the context of that
    // particular event.
    _viewRoom: function(roomId, showSettings, eventId, invite_sign_url) {
        // before we switch room, record the scroll state of the current room
        this._updateScrollMap();

        this.focusComposer = true;

        var newState = {
            currentRoom: roomId,
            initialEventId: eventId,
            highlightedEventId: eventId,
            initialEventPixelOffset: undefined,
            page_type: this.PageTypes.RoomView,
            inviteSignUrl: invite_sign_url,
        };

        // if we aren't given an explicit event id, look for one in the
        // scrollStateMap.
        if (!eventId) {
            var scrollState = this.scrollStateMap[roomId];
            if (scrollState) {
                newState.initialEventId = scrollState.focussedEvent;
                newState.initialEventPixelOffset = scrollState.pixelOffset;
            }
        }

        if (this.sdkReady) {
            // if the SDK is not ready yet, remember what room
            // we're supposed to be on but don't notify about
            // the new screen yet (we won't be showing it yet)
            // The normal case where this happens is navigating
            // to the room in the URL bar on page load.
            var presentedId = roomId;
            var room = MatrixClientPeg.get().getRoom(roomId);
            if (room) {
                var theAlias = MatrixTools.getCanonicalAliasForRoom(room);
                if (theAlias) presentedId = theAlias;

                var color_scheme_event = room.getAccountData("org.matrix.room.color_scheme");
                var color_scheme = {};
                if (color_scheme_event) {
                    color_scheme = color_scheme_event.getContent();
                    // XXX: we should validate the event
                }                
                Tinter.tint(color_scheme.primary_color, color_scheme.secondary_color);
            }

            if (eventId) {
                presentedId += "/"+eventId;
            }
            this.notifyNewScreen('room/'+presentedId);
            newState.ready = true;
        }
        this.setState(newState);

        if (this.refs.roomView && showSettings) {
            this.refs.roomView.showSettings(true);
        }
    },

    // update scrollStateMap according to the current scroll state of the
    // room view.
    _updateScrollMap: function() {
        if (!this.refs.roomView) {
            return;
        }

        var roomview = this.refs.roomView;
        var state = roomview.getScrollState();
        this.scrollStateMap[roomview.props.roomId] = state;
    },

    onLoggedIn: function(credentials) {
        credentials.guest = Boolean(credentials.guest);
        console.log("onLoggedIn => %s (guest=%s)", credentials.userId, credentials.guest);
        MatrixClientPeg.replaceUsingAccessToken(
            credentials.homeserverUrl, credentials.identityServerUrl,
            credentials.userId, credentials.accessToken, credentials.guest
        );
        this.setState({
            screen: undefined,
            logged_in: true
        });
        this.startMatrixClient();
        this.notifyNewScreen('');
    },

    startMatrixClient: function() {
        var cli = MatrixClientPeg.get();
        var self = this;
        cli.on('sync', function(state, prevState) {
            self.updateFavicon();
            if (state === "SYNCING" && prevState === "SYNCING") {
                return;
            }
            console.log("MatrixClient sync state => %s", state);
            if (state !== "PREPARED") { return; }
            self.sdkReady = true;

            if (self.starting_room_alias) {
                dis.dispatch({
                    action: 'view_room_alias',
                    room_alias: self.starting_room_alias,
                    event_id: self.starting_event_id,
                    invite_sign_url: self.starting_room_invite_sign_url,
                });
                delete self.starting_room_alias;
                delete self.starting_event_id;
                delete self.starting_room_invite_sign_url;
            } else if (!self.state.page_type) {
                if (!self.state.currentRoom) {
                    var firstRoom = null;
                    if (cli.getRooms() && cli.getRooms().length) {
                        firstRoom = RoomListSorter.mostRecentActivityFirst(
                            cli.getRooms()
                        )[0].roomId;
                        self.setState({ready: true, currentRoom: firstRoom, page_type: self.PageTypes.RoomView});
                    } else {
                        self.setState({ready: true, page_type: self.PageTypes.RoomDirectory});
                    }
                } else {
                    self.setState({ready: true, page_type: self.PageTypes.RoomView});
                }

                // we notifyNewScreen now because now the room will actually be displayed,
                // and (mostly) now we can get the correct alias.
                var presentedId = self.state.currentRoom;
                var room = MatrixClientPeg.get().getRoom(self.state.currentRoom);
                if (room) {
                    var theAlias = MatrixTools.getCanonicalAliasForRoom(room);
                    if (theAlias) presentedId = theAlias;
                }
                self.notifyNewScreen('room/'+presentedId);
                dis.dispatch({action: 'focus_composer'});
            } else {
                self.setState({ready: true});
            }
        });
        cli.on('Call.incoming', function(call) {
            dis.dispatch({
                action: 'incoming_call',
                call: call
            });
        });
        Notifier.start();
        UserActivity.start();
        Presence.start();
        cli.startClient({
            pendingEventOrdering: "end",
            initialSyncLimit: 20,
        });
    },

    onKeyDown: function(ev) {
        if (ev.altKey) {
            /*
            // Remove this for now as ctrl+alt = alt-gr so this breaks keyboards which rely on alt-gr for numbers
            // Will need to find a better meta key if anyone actually cares about using this.
            if (ev.ctrlKey && ev.keyCode > 48 && ev.keyCode < 58) {
                dis.dispatch({
                    action: 'view_indexed_room',
                    roomIndex: ev.keyCode - 49,
                });
                ev.stopPropagation();
                ev.preventDefault();
                return;
            }
            */
            switch (ev.keyCode) {
                case 38:
                    dis.dispatch({action: 'view_prev_room'});
                    ev.stopPropagation();
                    ev.preventDefault();
                    break;
                case 40:
                    dis.dispatch({action: 'view_next_room'});
                    ev.stopPropagation();
                    ev.preventDefault();
                    break;
            }
        }
    },

    onFocus: function(ev) {
        dis.dispatch({action: 'focus_composer'});
    },

    showScreen: function(screen, params) {
        if (screen == 'register') {
            dis.dispatch({
                action: 'start_registration',
                params: params
            });
        } else if (screen == 'login') {
            dis.dispatch({
                action: 'start_login',
                params: params
            });
        } else if (screen == 'token_login') {
            dis.dispatch({
                action: 'token_login',
                params: params
            });
        } else if (screen == 'forgot_password') {
            dis.dispatch({
                action: 'start_password_recovery',
                params: params
            });
        } else if (screen == 'new') {
            dis.dispatch({
                action: 'view_create_room',
            });
        } else if (screen == 'settings') {
            dis.dispatch({
                action: 'view_user_settings',
            });
        } else if (screen == 'directory') {
            dis.dispatch({
                action: 'view_room_directory',
            });
        } else if (screen == 'post_registration') {
            dis.dispatch({
                action: 'start_post_registration',
            });
        } else if (screen.indexOf('room/') == 0) {
            var segments = screen.substring(5).split('/');
            var roomString = segments[0];
            var eventId = segments[1]; // undefined if no event id given
            if (roomString[0] == '#') {
                if (this.state.logged_in) {
                    dis.dispatch({
                        action: 'view_room_alias',
                        room_alias: roomString,
                        event_id: eventId,
                        invite_sign_url: params.signurl,
                    });
                } else {
                    // Okay, we'll take you here soon...
                    this.starting_room_alias = roomString;
                    this.starting_room_invite_sign_url = params.signurl;
                    this.starting_event_id = eventId;
                    // ...but you're still going to have to log in.
                    this.notifyNewScreen('login');
                }
            } else {
                dis.dispatch({
                    action: 'view_room',
                    room_id: roomString,
                    event_id: eventId,
                    invite_sign_url: params.signurl,
                });
            }
        }
        else {
            console.error("Unknown screen : %s", screen);
        }
    },

    notifyNewScreen: function(screen) {
        if (this.props.onNewScreen) {
            this.props.onNewScreen(screen);
        }
    },

    onAliasClick: function(event, alias) {
        event.preventDefault();
        dis.dispatch({action: 'view_room_alias', room_alias: alias});
    },

    onUserClick: function(event, userId) {
        event.preventDefault();

        /*
        var MemberInfo = sdk.getComponent('rooms.MemberInfo');
        var member = new Matrix.RoomMember(null, userId);
        ContextualMenu.createMenu(MemberInfo, {
            member: member,
            right: window.innerWidth - event.pageX,
            top: event.pageY
        });
        */

        var member = new Matrix.RoomMember(null, userId);
        if (!member) { return; }
        dis.dispatch({
            action: 'view_user',
            member: member,
        });        
    },

    onLogoutClick: function(event) {
        dis.dispatch({
            action: 'logout'
        });
        event.stopPropagation();
        event.preventDefault();
    },

    handleResize: function(e) {
        var hideLhsThreshold = 1000;
        var showLhsThreshold = 1000;
        var hideRhsThreshold = 820;
        var showRhsThreshold = 820;

        if (this.state.width > hideLhsThreshold && window.innerWidth <= hideLhsThreshold) {
            dis.dispatch({ action: 'hide_left_panel' });
        }
        if (this.state.width <= showLhsThreshold && window.innerWidth > showLhsThreshold) {
            dis.dispatch({ action: 'show_left_panel' });
        }
        if (this.state.width > hideRhsThreshold && window.innerWidth <= hideRhsThreshold) {
            dis.dispatch({ action: 'hide_right_panel' });
        }
        if (this.state.width <= showRhsThreshold && window.innerWidth > showRhsThreshold) {
            dis.dispatch({ action: 'show_right_panel' });
        }

        this.setState({width: window.innerWidth});
    },

    onRoomCreated: function(room_id) {
        dis.dispatch({
            action: "view_room",
            room_id: room_id,
        });
    },

    onRegisterClick: function() {
        this.showScreen("register");
    },

    onLoginClick: function() {
        this.showScreen("login");
    },

    onForgotPasswordClick: function() {
        this.showScreen("forgot_password");
    },

    onRegistered: function(credentials) {
        this.onLoggedIn(credentials);
        // do post-registration stuff
        // This now goes straight to user settings
        // We use _setPage since if we wait for
        // showScreen to do the dispatch loop,
        // the showScreen dispatch will race with the
        // sdk sync finishing and we'll probably see
        // the page type still unset when the MatrixClient
        // is started and show the Room Directory instead.
        //this.showScreen("view_user_settings");
        this._setPage(this.PageTypes.UserSettings);
    },

    onFinishPostRegistration: function() {
        // Don't confuse this with "PageType" which is the middle window to show
        this.setState({
            screen: undefined
        });
        this.showScreen("settings");
    },

    onVersion: function(current, latest) {
        this.setState({
            version: current,
            hasNewVersion: current !== latest
        });
    },

    updateFavicon: function() {
        var notifCount = 0;

        var rooms = MatrixClientPeg.get().getRooms();
        for (var i = 0; i < rooms.length; ++i) {
            if (rooms[i].hasMembershipState(MatrixClientPeg.get().credentials.userId, 'invite')) {
                ++notifCount;
            } else if (rooms[i].getUnreadNotificationCount()) {
                notifCount += rooms[i].getUnreadNotificationCount();
            }
        }
        try {
            // This needs to be in in a try block as it will throw
            // if there are more than 100 badge count changes in
            // its internal queue
            this.favicon.badge(notifCount);
        } catch (e) {
            console.warn("Failed to set badge count: "+e.message);
        }
        document.title = "Vector"+(notifCount > 0 ? " ["+notifCount+"]" : "");
    },

    onUserSettingsClose: function() {
        // XXX: use browser history instead to find the previous room?
        if (this.state.currentRoom) {
            dis.dispatch({
                action: 'view_room',
                room_id: this.state.currentRoom,
            });
        }
        else {
            dis.dispatch({
                action: 'view_indexed_room',
                roomIndex: 0,
            });
        }
    },

    render: function() {
        var LeftPanel = sdk.getComponent('structures.LeftPanel');
        var RoomView = sdk.getComponent('structures.RoomView');
        var RightPanel = sdk.getComponent('structures.RightPanel');
        var UserSettings = sdk.getComponent('structures.UserSettings');
        var CreateRoom = sdk.getComponent('structures.CreateRoom');
        var RoomDirectory = sdk.getComponent('structures.RoomDirectory');
        var MatrixToolbar = sdk.getComponent('globals.MatrixToolbar');
        var GuestWarningBar = sdk.getComponent('globals.GuestWarningBar');
        var NewVersionBar = sdk.getComponent('globals.NewVersionBar');
        var ForgotPassword = sdk.getComponent('structures.login.ForgotPassword');

        // needs to be before normal PageTypes as you are logged in technically
        if (this.state.screen == 'post_registration') {
            return (
                <PostRegistration
                    onComplete={this.onFinishPostRegistration} />
            );
        }
        else if (this.state.logged_in && this.state.ready) {
            var page_element;
            var right_panel = "";

            switch (this.state.page_type) {
                case this.PageTypes.RoomView:
                    page_element = (
                        <RoomView
                            ref="roomView"
                            roomId={this.state.currentRoom}
                            eventId={this.state.initialEventId}
                            inviteSignUrl={this.state.inviteSignUrl}
                            highlightedEventId={this.state.highlightedEventId}
                            eventPixelOffset={this.state.initialEventPixelOffset}
                            key={this.state.currentRoom}
                            ConferenceHandler={this.props.ConferenceHandler} />
                    );
                    right_panel = <RightPanel roomId={this.state.currentRoom} collapsed={this.state.collapse_rhs} />
                    break;
                case this.PageTypes.UserSettings:
                    page_element = <UserSettings onClose={this.onUserSettingsClose} version={this.state.version} />
                    right_panel = <RightPanel collapsed={this.state.collapse_rhs}/>
                    break;
                case this.PageTypes.CreateRoom:
                    page_element = <CreateRoom onRoomCreated={this.onRoomCreated}/>
                    right_panel = <RightPanel collapsed={this.state.collapse_rhs}/>
                    break;
                case this.PageTypes.RoomDirectory:
                    page_element = <RoomDirectory />
                    right_panel = <RightPanel collapsed={this.state.collapse_rhs}/>
                    break;
            }

            var topBar;
            if (MatrixClientPeg.get().isGuest()) {
                topBar = <GuestWarningBar />;
            }
            else if (Notifier.supportsDesktopNotifications() && !Notifier.isEnabled() && !Notifier.isToolbarHidden()) {
                topBar = <MatrixToolbar />;
            }
            else if (this.state.hasNewVersion) {
                topBar = <NewVersionBar />;
            }

            var bodyClasses = "mx_MatrixChat";
            if (topBar) {
                bodyClasses += " mx_MatrixChat_toolbarShowing";
            }

            return (
                <div className="mx_MatrixChat_wrapper">
                    {topBar}
                    <div className={bodyClasses}>
                        <LeftPanel selectedRoom={this.state.currentRoom} collapsed={this.state.collapse_lhs} />
                        <main className="mx_MatrixChat_middlePanel">
                            {page_element}
                        </main>
                        {right_panel}
                    </div>
                </div>
            );
        } else if (this.state.logged_in || (!this.state.logged_in && this._autoRegisterAsGuest)) {
            var Spinner = sdk.getComponent('elements.Spinner');
            var logoutLink;
            if (this.state.logged_in) {
                logoutLink = (
                    <a href="#" className="mx_MatrixChat_splashButtons" onClick={ this.onLogoutClick }>
                    Logout
                    </a>
                );
            }
            return (
                <div className="mx_MatrixChat_splash">
                    <Spinner />
                    {logoutLink}
                </div>
            );
        } else if (this.state.screen == 'register') {
            return (
                <Registration
                    clientSecret={this.state.register_client_secret}
                    sessionId={this.state.register_session_id}
                    idSid={this.state.register_id_sid}
                    email={this.props.startingQueryParams.email}
                    username={this.state.upgradeUsername}
                    disableUsernameChanges={Boolean(this.state.upgradeUsername)}
                    guestAccessToken={this.state.guestAccessToken}
                    hsUrl={this.props.config.default_hs_url}
                    isUrl={this.props.config.default_is_url}
                    registrationUrl={this.props.registrationUrl}
                    onLoggedIn={this.onRegistered}
                    onLoginClick={this.onLoginClick} />
            );
        } else if (this.state.screen == 'forgot_password') {
            return (
                <ForgotPassword
                    homeserverUrl={this.props.config.default_hs_url}
                    identityServerUrl={this.props.config.default_is_url}
                    onComplete={this.onLoginClick} />
            );
        } else {
            return (
                <Login
                    onLoggedIn={this.onLoggedIn}
                    onRegisterClick={this.onRegisterClick}
                    homeserverUrl={this.props.config.default_hs_url}
                    identityServerUrl={this.props.config.default_is_url}
                    onForgotPasswordClick={this.onForgotPasswordClick} 
                    onLoginAsGuestClick={this.props.enableGuest && this.props.config && this.props.config.default_hs_url ? this._registerAsGuest: undefined}
                    />
            );
        }
    }
});