// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

import 'babel-polyfill';
import Orientation from 'react-native-orientation';
import {Provider} from 'react-redux';
import {Navigation, NativeEventsReceiver} from 'react-native-navigation';
import {IntlProvider} from 'react-intl';
import {
    Alert,
    AppState,
    InteractionManager,
    Keyboard,
    NativeModules,
    Platform,
} from 'react-native';
import DeviceInfo from 'react-native-device-info';
import {setJSExceptionHandler, setNativeExceptionHandler} from 'react-native-exception-handler';
import StatusBarSizeIOS from 'react-native-status-bar-size';
import semver from 'semver';

import {General} from 'mattermost-redux/constants';
import {setAppState, setDeviceToken, setServerVersion} from 'mattermost-redux/actions/general';
import {markChannelAsRead} from 'mattermost-redux/actions/channels';
import {setSystemEmojis} from 'mattermost-redux/actions/emojis';
import {logError} from 'mattermost-redux/actions/errors';
import {loadMe, logout} from 'mattermost-redux/actions/users';
import {close as closeWebSocket} from 'mattermost-redux/actions/websocket';
import {Client4} from 'mattermost-redux/client';
import EventEmitter from 'mattermost-redux/utils/event_emitter';

import {
    calculateDeviceDimensions,
    setDeviceOrientation,
    setDeviceAsTablet,
    setStatusBarHeight,
} from 'app/actions/device';
import {
    createPost,
    loadConfigAndLicense,
    loadFromPushNotification,
    purgeOfflineStore,
} from 'app/actions/views/root';
import {setChannelDisplayName} from 'app/actions/views/channel';
import {handleLoginIdChanged} from 'app/actions/views/login';
import {handleServerUrlChanged} from 'app/actions/views/select_server';
import {NavigationTypes, ViewTypes} from 'app/constants';
import {getTranslations} from 'app/i18n';
import initialState from 'app/initial_state';
import PushNotifications from 'app/push_notifications';
import {registerScreens} from 'app/screens';
import configureStore from 'app/store';
import mattermostBucket from 'app/mattermost_bucket';
import mattermostManaged from 'app/mattermost_managed';
import {deleteFileCache} from 'app/utils/file';
import {init as initAnalytics} from 'app/utils/segment';
import {captureException, initializeSentry, LOGGER_JAVASCRIPT, LOGGER_NATIVE} from 'app/utils/sentry';
import tracker from 'app/utils/time_tracker';
import {stripTrailingSlashes} from 'app/utils/url';
import {EmojiIndicesByAlias} from 'app/utils/emojis';

import LocalConfig from 'assets/config';

const {StatusBarManager} = NativeModules;
const AUTHENTICATION_TIMEOUT = 5 * 60 * 1000;

export default class Mattermost {
    constructor() {
        this.isConfigured = false;
        this.allowOtherServers = true;
        this.startAppFromPushNotification = false;
        this.emmEnabled = false;

        Client4.setUserAgent(DeviceInfo.getUserAgent());
        Orientation.unlockAllOrientations();
        initializeSentry();
        this.store = configureStore(initialState);
        registerScreens(this.store, Provider);

        this.unsubscribeFromStore = this.store.subscribe(this.listenForHydration);
        AppState.addEventListener('change', this.handleAppStateChange);
        EventEmitter.on(General.SERVER_VERSION_CHANGED, this.handleServerVersionChanged);
        EventEmitter.on(General.CONFIG_CHANGED, this.handleConfigChanged);
        EventEmitter.on(NavigationTypes.NAVIGATION_RESET, this.handleLogout);
        EventEmitter.on(General.DEFAULT_CHANNEL, this.handleResetChannelDisplayName);
        EventEmitter.on(NavigationTypes.RESTART_APP, this.restartApp);
        Orientation.addOrientationListener(this.orientationDidChange);
        mattermostManaged.addEventListener('managedConfigDidChange', this.handleManagedConfig);

        if (Platform.OS === 'ios') {
            StatusBarSizeIOS.addEventListener('willChange', this.handleStatusBarHeightChange);
        }

        setJSExceptionHandler(this.errorHandler, false);
        setNativeExceptionHandler(this.nativeErrorHandler, false);
        setSystemEmojis(EmojiIndicesByAlias);
    }

    errorHandler = (e, isFatal) => {
        if (!e) {
            // This method gets called for propTypes errors in dev mode without an exception
            return;
        }

        console.warn('Handling Javascript error ' + JSON.stringify(e)); // eslint-disable-line no-console
        captureException(e, LOGGER_JAVASCRIPT, this.store);

        const intl = this.getIntl();
        closeWebSocket()(this.store.dispatch, this.store.getState);

        if (Client4.getUrl()) {
            logError(e)(this.store.dispatch);
        }

        if (isFatal) {
            Alert.alert(
                intl.formatMessage({id: 'mobile.error_handler.title', defaultMessage: 'Unexpected error occurred'}),
                intl.formatMessage({id: 'mobile.error_handler.description', defaultMessage: '\nClick relaunch to open the app again. After restart, you can report the problem from the settings menu.\n'}),
                [{
                    text: intl.formatMessage({id: 'mobile.error_handler.button', defaultMessage: 'Relaunch'}),
                    onPress: () => {
                        // purge the store
                        this.store.dispatch(purgeOfflineStore());
                    },
                }],
                {cancelable: false}
            );
        }
    };

    nativeErrorHandler = (e) => {
        console.warn('Handling native error ' + JSON.stringify(e)); // eslint-disable-line no-console
        captureException(e, LOGGER_NATIVE, this.store);
    };

    getIntl = () => {
        const state = this.store.getState();
        let locale = DeviceInfo.getDeviceLocale().split('-')[0];
        if (state.views.i18n.locale) {
            locale = state.views.i18n.locale;
        }

        const intlProvider = new IntlProvider({locale, messages: getTranslations(locale)}, {});
        const {intl} = intlProvider.getChildContext();
        return intl;
    };

    configureAnalytics = (config) => {
        if (config && config.DiagnosticsEnabled === 'true' && config.DiagnosticId && LocalConfig.SegmentApiKey) {
            initAnalytics(config);
        } else {
            global.analytics = null;
        }
    };

    configurePushNotifications = () => {
        PushNotifications.configure({
            onRegister: this.onRegisterDevice,
            onNotification: this.onPushNotification,
            onReply: this.onPushNotificationReply,
            popInitialNotification: true,
            requestPermissions: true,
        });
        this.isConfigured = true;
    };

    handleAppStateChange = async (appState) => {
        const {dispatch, getState} = this.store;
        const isActive = appState === 'active';

        setAppState(isActive)(dispatch, getState);

        if (isActive && this.shouldRelaunchWhenActive) {
            // This handles when the app was started in the background
            // cause of an iOS push notification reply
            this.launchApp();
            this.shouldRelaunchWhenActive = false;
        } else if (!isActive && !this.inBackgroundSince) {
            // When the app is sent to the background we set the time when that happens
            // and perform a data clean up to improve on performance
            this.inBackgroundSince = Date.now();
            dispatch({type: ViewTypes.DATA_CLEANUP, payload: getState()});
        } else if (isActive && this.inBackgroundSince && (Date.now() - this.inBackgroundSince) >= AUTHENTICATION_TIMEOUT && this.emmEnabled) {
            // Once the app becomes active after more than 5 minutes in the background and is controlled by an EMM
            try {
                const config = await mattermostManaged.getConfig();
                const authNeeded = config.inAppPinCode && config.inAppPinCode === 'true';
                if (authNeeded) {
                    const authenticated = await this.handleAuthentication(config.vendor);
                    if (!authenticated) {
                        mattermostManaged.quitApp();
                    }
                }
            } catch (error) {
                // do nothing
            }
        }

        if (isActive) {
            this.inBackgroundSince = null;
            Keyboard.dismiss();
        }
    };

    handleAuthentication = async (vendor) => {
        const isSecured = await mattermostManaged.isDeviceSecure();

        const intl = this.getIntl();
        if (isSecured) {
            try {
                mattermostBucket.setPreference('emm', vendor, LocalConfig.AppGroupId);
                await mattermostManaged.authenticate({
                    reason: intl.formatMessage({
                        id: 'mobile.managed.secured_by',
                        defaultMessage: 'Secured by {vendor}',
                    }, {vendor}),
                    fallbackToPasscode: true,
                    suppressEnterPassword: true,
                });
            } catch (err) {
                mattermostManaged.quitApp();
                return false;
            }
        }

        return true;
    };

    handleServerVersionChanged = async (serverVersion) => {
        const {dispatch, getState} = this.store;
        const version = serverVersion.match(/^[0-9]*.[0-9]*.[0-9]*(-[a-zA-Z0-9.-]*)?/g)[0];
        const intl = this.getIntl();
        const state = getState();

        if (serverVersion) {
            if (semver.valid(version) && semver.lt(version, LocalConfig.MinServerVersion)) {
                Alert.alert(
                    intl.formatMessage({id: 'mobile.server_upgrade.title', defaultMessage: 'Server upgrade required'}),
                    intl.formatMessage({id: 'mobile.server_upgrade.description', defaultMessage: '\nA server upgrade is required to use the Mattermost app. Please ask your System Administrator for details.\n'}),
                    [{
                        text: intl.formatMessage({id: 'mobile.server_upgrade.button', defaultMessage: 'OK'}),
                        onPress: this.handleServerVersionUpgradeNeeded,
                    }],
                    {cancelable: false}
                );
            } else if (state.entities.users && state.entities.users.currentUserId) {
                setServerVersion(serverVersion)(dispatch, getState);

                // Note that license and config changes are now emitted as websocket events, but
                // we might be connected to an older server. Loading the configuration multiple
                // times isn't a high overhead at present, so there's no harm in potentially
                // repeating the load and handling for now.
                const data = await loadConfigAndLicense()(dispatch, getState);
                this.handleConfigChanged(data.config);
            }
        }
    };

    handleConfigChanged = (config) => {
        this.configureAnalytics(config);
    }

    handleManagedConfig = async (serverConfig) => {
        const {dispatch, getState} = this.store;
        const state = getState();

        let authNeeded = false;
        let blurApplicationScreen = false;
        let jailbreakProtection = false;
        let vendor = null;
        let serverUrl = null;
        let username = null;

        if (LocalConfig.AutoSelectServerUrl) {
            handleServerUrlChanged(LocalConfig.DefaultServerUrl)(dispatch, getState);
            this.allowOtherServers = false;
        }

        try {
            const config = await mattermostManaged.getConfig();
            if (config && Object.keys(config).length) {
                this.emmEnabled = true;
                authNeeded = config.inAppPinCode && config.inAppPinCode === 'true';
                blurApplicationScreen = config.blurApplicationScreen && config.blurApplicationScreen === 'true';
                jailbreakProtection = config.jailbreakProtection && config.jailbreakProtection === 'true';
                vendor = config.vendor || 'Mattermost';

                if (!state.entities.general.credentials.token) {
                    serverUrl = config.serverUrl;
                    username = config.username;

                    if (config.allowOtherServers && config.allowOtherServers === 'false') {
                        this.allowOtherServers = false;
                    }
                }

                if (jailbreakProtection) {
                    const isTrusted = mattermostManaged.isTrustedDevice();

                    if (!isTrusted) {
                        const intl = this.getIntl();
                        Alert.alert(
                            intl.formatMessage({
                                id: 'mobile.managed.blocked_by',
                                defaultMessage: 'Blocked by {vendor}',
                            }, {vendor}),
                            intl.formatMessage({
                                id: 'mobile.managed.jailbreak',
                                defaultMessage: 'Jailbroken devices are not trusted by {vendor}, please exit the app.',
                            }, {vendor}),
                            [{
                                text: intl.formatMessage({id: 'mobile.managed.exit', defaultMessage: 'Exit'}),
                                style: 'destructive',
                                onPress: () => {
                                    mattermostManaged.quitApp();
                                },
                            }],
                            {cancelable: false}
                        );
                        return false;
                    }
                }

                if (authNeeded && !serverConfig) {
                    if (Platform.OS === 'android') {
                        //Start a fake app as we need at least one activity for android
                        await this.startFakeApp();
                    }
                    const authenticated = await this.handleAuthentication(vendor);
                    if (!authenticated) {
                        return false;
                    }
                }

                if (blurApplicationScreen) {
                    mattermostManaged.blurAppScreen(true);
                }

                if (serverUrl) {
                    handleServerUrlChanged(serverUrl)(dispatch, getState);
                }

                if (username) {
                    handleLoginIdChanged(username)(dispatch, getState);
                }
            }
        } catch (error) {
            return true;
        }

        return true;
    };

    handleLogout = () => {
        this.appStarted = false;
        deleteFileCache();
        this.resetBadgeAndVersion();
        this.startApp('fade');
    };

    handleResetChannelDisplayName = (displayName) => {
        this.store.dispatch(setChannelDisplayName(displayName));
    };

    handleStatusBarHeightChange = (nextStatusBarHeight) => {
        this.store.dispatch(setStatusBarHeight(nextStatusBarHeight));
    };

    handleServerVersionUpgradeNeeded = async () => {
        const {dispatch, getState} = this.store;

        this.resetBadgeAndVersion();

        if (getState().entities.general.credentials.token) {
            InteractionManager.runAfterInteractions(() => {
                logout()(dispatch, getState);
            });
        }
    };

    // We need to wait for hydration to occur before load the router.
    listenForHydration = () => {
        const {dispatch, getState} = this.store;
        const state = getState();
        if (!this.isConfigured) {
            this.configurePushNotifications();
        }

        if (state.views.root.hydrationComplete) {
            const orientation = Orientation.getInitialOrientation();
            const {credentials, config} = state.entities.general;
            const {currentUserId} = state.entities.users;
            const isNotActive = AppState.currentState !== 'active';
            const notification = PushNotifications.getNotification();

            this.unsubscribeFromStore();

            if (this.deviceToken) {
                // If the deviceToken is set we need to dispatch it to the redux store
                setDeviceToken(this.deviceToken)(dispatch, getState);
            }

            if (orientation) {
                this.orientationDidChange(orientation);
            }

            if (config) {
                this.configureAnalytics(config);
            }

            if (credentials.token && credentials.url) {
                Client4.setToken(credentials.token);
                Client4.setUrl(stripTrailingSlashes(credentials.url));
            }

            if (currentUserId) {
                Client4.setUserId(currentUserId);
            }

            if (Platform.OS === 'ios') {
                StatusBarManager.getHeight(
                    (data) => {
                        this.handleStatusBarHeightChange(data.height);
                    }
                );
            }

            if (notification || this.replyNotificationData) {
                // If we have a notification means that the app was started cause of a reply
                // and the app was not sitting in the background nor opened
                const notificationData = notification || this.replyNotificationData;
                const {data, text, badge, completed} = notificationData;
                this.onPushNotificationReply(data, text, badge, completed);
                PushNotifications.resetNotification();
            }

            if (Platform.OS === 'android') {
                // In case of Android we need to handle the bridge being initialized by HeadlessJS
                Promise.resolve(Navigation.isAppLaunched()).then((appLaunched) => {
                    if (this.startAppFromPushNotification) {
                        return;
                    }

                    if (appLaunched) {
                        this.launchApp(); // App is launched -> show UI
                    } else {
                        new NativeEventsReceiver().appLaunched(this.launchApp); // App hasn't been launched yet -> show the UI only when needed.
                    }
                });
            } else if (isNotActive) {
                // for IOS replying from push notification starts the app in the background
                this.shouldRelaunchWhenActive = true;
                this.startFakeApp();
            } else {
                this.launchApp();
            }
        }
    };

    onRegisterDevice = (data) => {
        this.isConfigured = true;
        const {dispatch, getState} = this.store;
        let prefix;
        if (Platform.OS === 'ios') {
            prefix = General.PUSH_NOTIFY_APPLE_REACT_NATIVE;
            if (DeviceInfo.getBundleId().includes('rnbeta')) {
                prefix = `${prefix}beta`;
            }
        } else {
            prefix = General.PUSH_NOTIFY_ANDROID_REACT_NATIVE;
        }

        const state = getState();
        const token = `${prefix}:${data.token}`;
        if (state.views.root.hydrationComplete) {
            setDeviceToken(token)(dispatch, getState);
        } else {
            this.deviceToken = token;
        }
    };

    onPushNotification = (deviceNotification) => {
        const {dispatch, getState} = this.store;
        const state = getState();
        const {token, url} = state.entities.general.credentials;

        // mark the app as started as soon as possible
        if (!this.appStarted && Platform.OS !== 'ios') {
            this.startAppFromPushNotification = true;
        }

        const {data, foreground, message, userInfo, userInteraction} = deviceNotification;
        const notification = {
            data,
            message,
        };

        if (userInfo) {
            notification.localNotification = userInfo.localNotification;
        }

        if (data.type === 'clear') {
            markChannelAsRead(data.channel_id, null, false)(dispatch, getState);
        } else if (foreground) {
            EventEmitter.emit(ViewTypes.NOTIFICATION_IN_APP, notification);
        } else if (userInteraction && !notification.localNotification) {
            EventEmitter.emit('close_channel_drawer');
            if (this.startAppFromPushNotification) {
                Client4.setToken(token);
                Client4.setUrl(stripTrailingSlashes(url));
            }

            InteractionManager.runAfterInteractions(async () => {
                await loadFromPushNotification(notification)(dispatch, getState);

                if (this.startAppFromPushNotification) {
                    this.launchApp();
                } else {
                    EventEmitter.emit(ViewTypes.NOTIFICATION_TAPPED);
                }
            });
        }
    };

    onPushNotificationReply = (data, text, badge, completed) => {
        const {dispatch, getState} = this.store;
        const state = getState();
        const {currentUserId} = state.entities.users;

        if (currentUserId) {
            // one thing to note is that for android it will reply to the last post in the stack
            const rootId = data.root_id || data.post_id;
            const post = {
                user_id: currentUserId,
                channel_id: data.channel_id,
                root_id: rootId,
                parent_id: rootId,
                message: text,
            };

            if (!Client4.getUrl()) {
                // Make sure the Client has the server url set
                Client4.setUrl(state.entities.general.credentials.url);
            }

            if (!Client4.getToken()) {
                // Make sure the Client has the server token set
                Client4.setToken(state.entities.general.credentials.token);
            }

            createPost(post)(dispatch, getState).then(() => {
                markChannelAsRead(data.channel_id)(dispatch, getState);

                if (badge >= 0) {
                    PushNotifications.setApplicationIconBadgeNumber(badge);
                }

                this.replyNotificationData = null;
            }).then(completed);
        } else {
            this.replyNotificationData = {
                data,
                text,
                badge,
                completed,
            };
        }
    };

    orientationDidChange = (orientation) => {
        const {dispatch} = this.store;
        dispatch(setDeviceOrientation(orientation));
        if (DeviceInfo.isTablet()) {
            dispatch(setDeviceAsTablet());
        }
        setTimeout(() => {
            dispatch(calculateDeviceDimensions());
        }, 100);
    };

    resetBadgeAndVersion = () => {
        const {dispatch, getState} = this.store;
        Client4.serverVersion = '';
        Client4.setUserId('');
        PushNotifications.setApplicationIconBadgeNumber(0);
        PushNotifications.cancelAllLocalNotifications();
        setServerVersion('')(dispatch, getState);
    };

    restartApp = async () => {
        Navigation.dismissModal({animationType: 'none'});

        const {dispatch, getState} = this.store;
        await loadConfigAndLicense()(dispatch, getState);
        await loadMe()(dispatch, getState);
        this.appStarted = false;
        this.startApp('fade');
    };

    launchApp = () => {
        this.handleManagedConfig().then((shouldStart) => {
            if (shouldStart) {
                this.startApp('fade');
            }
        });
    };

    startFakeApp = async () => {
        return Navigation.startSingleScreenApp({
            screen: {
                screen: 'Root',
                navigatorStyle: {
                    navBarHidden: true,
                    statusBarHidden: false,
                    statusBarHideWithNavBar: false,
                },
            },
        });
    };

    startApp = (animationType = 'none') => {
        if (!this.appStarted) {
            const {dispatch, getState} = this.store;
            const {entities} = getState();
            let screen = 'SelectServer';

            if (entities) {
                const {credentials} = entities.general;

                if (credentials.token && credentials.url) {
                    screen = 'Channel';
                    tracker.initialLoad = Date.now();
                    loadMe()(dispatch, getState);
                }
            }

            Navigation.startSingleScreenApp({
                screen: {
                    screen,
                    navigatorStyle: {
                        navBarHidden: true,
                        statusBarHidden: false,
                        statusBarHideWithNavBar: false,
                        screenBackgroundColor: 'transparent',
                    },
                },
                passProps: {
                    allowOtherServers: this.allowOtherServers,
                },
                appStyle: {
                    orientation: 'auto',
                },
                animationType,
            });

            this.appStarted = true;
            this.startAppFromPushNotification = false;
        }
    };
}