/* global __dirname */

const {
    BrowserWindow,
    Menu,
    app,
    ipcMain
} = require('electron');
const contextMenu = require('electron-context-menu');
const debug = require('electron-debug');
const isDev = require('electron-is-dev');
const { autoUpdater } = require('electron-updater');
const windowStateKeeper = require('electron-window-state');
const {
    initPopupsConfigurationMain,
    getPopupTarget,
    RemoteControlMain,
    setupAlwaysOnTopMain,
    setupPowerMonitorMain,
    setupScreenSharingMain
} = require('@jitsi/electron-sdk');
const path = require('path');
const process = require('process');
const URL = require('url');
const config = require('./app/features/config');
const { openExternalLink } = require('./app/features/utils/openExternalLink');
const pkgJson = require('./package.json');

const showDevTools = Boolean(process.env.SHOW_DEV_TOOLS) || (process.argv.indexOf('--show-dev-tools') > -1);

const ENABLE_REMOTE_CONTROL = false;

// We need this because of https://github.com/electron/electron/issues/18214
app.commandLine.appendSwitch('disable-site-isolation-trials');

// This allows BrowserWindow.setContentProtection(true) to work on macOS.
// https://github.com/electron/electron/issues/19880
app.commandLine.appendSwitch('disable-features', 'DesktopCaptureMacV2,IOSurfaceCapturer');

// Enable Opus RED field trial.
app.commandLine.appendSwitch('force-fieldtrials', 'WebRTC-Audio-Red-For-Opus/Enabled/');

// Wayland: Enable optional PipeWire and window decorations support.
if (!app.commandLine.hasSwitch('enable-features')) {
    app.commandLine.appendSwitch('enable-features', 'WebRTCPipeWireCapturer,WaylandWindowDecorations');
}

autoUpdater.logger = require('electron-log');
autoUpdater.logger.transports.file.level = 'info';

// Enable context menu so things like copy and paste work in input fields.
contextMenu({
    showLookUpSelection: false,
    showSearchWithGoogle: false,
    showCopyImage: false,
    showCopyImageAddress: false,
    showSaveImage: false,
    showSaveImageAs: false,
    showInspectElement: true,
    showServices: false
});

// Enable DevTools also on release builds to help troubleshoot issues. Don't
// show them automatically though.
debug({
    isEnabled: true,
    showDevTools
});

/**
 * When in development mode:
 * - Enable automatic reloads
 */
if (isDev) {
    require('electron-reload')(path.join(__dirname, 'build'));
}

/**
 * The window object that will load the iframe with Jitsi Meet.
 * IMPORTANT: Must be defined as global in order to not be garbage collected
 * acidentally.
 */
let mainWindow = null;

let webrtcInternalsWindow = null;

/**
 * Add protocol data
 */
const appProtocolSurplus = `${config.default.appProtocolPrefix}://`;
let rendererReady = false;
let protocolDataForFrontApp = null;


/**
 * Sets the application menu. It is hidden on all platforms except macOS because
 * otherwise copy and paste functionality is not available.
 */
function setApplicationMenu() {
    if (process.platform === 'darwin') {
        const template = [ {
            label: app.name,
            submenu: [
                {
                    role: 'services',
                    submenu: []
                },
                { type: 'separator' },
                { role: 'hide' },
                { role: 'hideothers' },
                { role: 'unhide' },
                { type: 'separator' },
                { role: 'quit' }
            ]
        }, {
            label: 'Edit',
            submenu: [ {
                label: 'Undo',
                accelerator: 'CmdOrCtrl+Z',
                selector: 'undo:'
            },
            {
                label: 'Redo',
                accelerator: 'Shift+CmdOrCtrl+Z',
                selector: 'redo:'
            },
            {
                type: 'separator'
            },
            {
                label: 'Cut',
                accelerator: 'CmdOrCtrl+X',
                selector: 'cut:'
            },
            {
                label: 'Copy',
                accelerator: 'CmdOrCtrl+C',
                selector: 'copy:'
            },
            {
                label: 'Paste',
                accelerator: 'CmdOrCtrl+V',
                selector: 'paste:'
            },
            {
                label: 'Select All',
                accelerator: 'CmdOrCtrl+A',
                selector: 'selectAll:'
            } ]
        }, {
            label: '&Window',
            role: 'window',
            submenu: [
                { role: 'minimize' },
                { role: 'close' }
            ]
        } ];

        Menu.setApplicationMenu(Menu.buildFromTemplate(template));
    } else {
        Menu.setApplicationMenu(null);
    }
}

/**
 * Opens new window with index.html(Jitsi Meet is loaded in iframe there).
 */
function createJitsiMeetWindow() {
    // Application menu.
    setApplicationMenu();

    // Check for Updates.
    if (!process.mas) {
        autoUpdater.checkForUpdatesAndNotify();
    }

    // Load the previous window state with fallback to defaults.
    const windowState = windowStateKeeper({
        defaultWidth: 800,
        defaultHeight: 600,
        fullScreen: false
    });

    // Path to root directory.
    const basePath = isDev ? __dirname : app.getAppPath();

    // URL for index.html which will be our entry point.
    const indexURL = URL.format({
        pathname: path.resolve(basePath, './build/index.html'),
        protocol: 'file:',
        slashes: true
    });

    // Options used when creating the main Jitsi Meet window.
    // Use a preload script in order to provide node specific functionality
    // to a isolated BrowserWindow in accordance with electron security
    // guideline.
    const options = {
        x: windowState.x,
        y: windowState.y,
        width: windowState.width,
        height: windowState.height,
        icon: path.resolve(basePath, './resources/icon.png'),
        minWidth: 800,
        minHeight: 600,
        show: false,
        webPreferences: {
            enableBlinkFeatures: 'WebAssemblyCSP',
            contextIsolation: false,
            nodeIntegration: false,
            preload: path.resolve(basePath, './build/preload.js'),
            sandbox: false
        }
    };

    const windowOpenHandler = ({ url, frameName }) => {
        const target = getPopupTarget(url, frameName);

        if (!target || target === 'browser') {
            openExternalLink(url);

            return { action: 'deny' };
        }

        if (target === 'electron') {
            return { action: 'allow' };
        }

        return { action: 'deny' };
    };

    mainWindow = new BrowserWindow(options);
    windowState.manage(mainWindow);
    mainWindow.loadURL(indexURL);

    mainWindow.webContents.setWindowOpenHandler(windowOpenHandler);

    if (isDev) {
        mainWindow.webContents.session.clearCache();
    }

    // Block access to file:// URLs.
    const fileFilter = {
        urls: [ 'file://*' ]
    };

    mainWindow.webContents.session.webRequest.onBeforeSendHeaders(fileFilter, (details, callback) => {
        const requestedUrl = new URL.URL(details.url);
        const requestedBasename = path.resolve(requestedUrl.pathname);
        const appBasePath = path.resolve(basePath);

        if (!requestedBasename.startsWith(appBasePath)) {
            callback(false);
            console.warn(`Rejected file URL: ${details.url}`);

            return;
        }

        callback(true);
    });

    // Filter out x-frame-options and frame-ancestors CSP to allow loading jitsi via the iframe API
    // Resolves https://github.com/jitsi/jitsi-meet-electron/issues/285
    mainWindow.webContents.session.webRequest.onHeadersReceived((details, callback) => {
        delete details.responseHeaders['x-frame-options'];

        if (details.responseHeaders['content-security-policy']) {
            const cspFiltered = details.responseHeaders['content-security-policy'][0]
                .split(';')
                .filter(x => x.indexOf('frame-ancestors') === -1)
                .join(';');

            details.responseHeaders['content-security-policy'] = [ cspFiltered ];
        }

        callback({
            responseHeaders: details.responseHeaders
        });
    });

    // Block redirects.
    const allowedRedirects = [
        'http:',
        'https:',
        'ws:',
        'wss:'
    ];

    mainWindow.webContents.addListener('will-redirect', (ev, url) => {
        const requestedUrl = new URL.URL(url);

        if (!allowedRedirects.includes(requestedUrl.protocol)) {
            console.warn(`Disallowing redirect to ${url}`);
            ev.preventDefault();
        }
    });

    // Block opening any external applications.
    mainWindow.webContents.session.setPermissionRequestHandler((_, permission, callback, details) => {
        if (permission === 'openExternal') {
            console.warn(`Disallowing opening ${details.externalURL}`);
            callback(false);

            return;
        }

        callback(true);
    });

    initPopupsConfigurationMain(mainWindow);
    setupAlwaysOnTopMain(mainWindow, null, windowOpenHandler);
    setupPowerMonitorMain(mainWindow);
    setupScreenSharingMain(mainWindow, config.default.appName, pkgJson.build.appId);
    if (ENABLE_REMOTE_CONTROL) {
        new RemoteControlMain(mainWindow); // eslint-disable-line no-new
    }

    mainWindow.on('closed', () => {
        mainWindow = null;
    });
    mainWindow.once('ready-to-show', () => {
        mainWindow.show();
    });

    /**
     * When someone tries to enter something like jitsi-meet://test
     *  while app is closed
     * it will trigger this event below
     */
    handleProtocolCall(process.argv.pop());
}

/**
 * Opens new window with WebRTC internals.
 */
function createWebRTCInternalsWindow() {
    const options = {
        minWidth: 800,
        minHeight: 600,
        show: true
    };

    webrtcInternalsWindow = new BrowserWindow(options);
    webrtcInternalsWindow.loadURL('chrome://webrtc-internals');
}

/**
 * Handler for application protocol links to initiate a conference.
 */
function handleProtocolCall(fullProtocolCall) {
    // don't touch when something is bad
    if (
        !fullProtocolCall
        || fullProtocolCall.trim() === ''
        || fullProtocolCall.indexOf(appProtocolSurplus) !== 0
    ) {
        return;
    }

    const inputURL = fullProtocolCall.replace(appProtocolSurplus, '');

    if (app.isReady() && mainWindow === null) {
        createJitsiMeetWindow();
    }

    protocolDataForFrontApp = inputURL;

    if (rendererReady) {
        mainWindow
            .webContents
            .send('protocol-data-msg', inputURL);
    }
}

/**
 * Force Single Instance Application.
 * Handle this on darwin via LSMultipleInstancesProhibited in Info.plist as below does not work on MAS
 */
const gotInstanceLock = process.platform === 'darwin' ? true : app.requestSingleInstanceLock();

if (!gotInstanceLock) {
    app.quit();
    process.exit(0);
}

/**
 * Run the application.
 */

app.on('activate', () => {
    if (mainWindow === null) {
        createJitsiMeetWindow();
    }
});

app.on('certificate-error',
    // eslint-disable-next-line max-params
    (event, webContents, url, error, certificate, callback) => {
        if (isDev) {
            event.preventDefault();
            callback(true);
        } else {
            callback(false);
        }
    }
);

app.on('ready', createJitsiMeetWindow);

if (isDev) {
    app.on('ready', createWebRTCInternalsWindow);
}

app.on('second-instance', (event, commandLine) => {
    /**
     * If someone creates second instance of the application, set focus on
     * existing window.
     */
    if (mainWindow) {
        mainWindow.isMinimized() && mainWindow.restore();
        mainWindow.focus();

        /**
         * This is for windows [win32]
         * so when someone tries to enter something like jitsi-meet://test
         * while app is opened it will trigger protocol handler.
         */
        handleProtocolCall(commandLine.pop());
    }
});

app.on('window-all-closed', () => {
    app.quit();
});

// remove so we can register each time as we run the app.
app.removeAsDefaultProtocolClient(config.default.appProtocolPrefix);

// If we are running a non-packaged version of the app && on windows
if (isDev && process.platform === 'win32') {
    // Set the path of electron.exe and your app.
    // These two additional parameters are only available on windows.
    app.setAsDefaultProtocolClient(
        config.default.appProtocolPrefix,
        process.execPath,
        [ path.resolve(process.argv[1]) ]
    );
} else {
    app.setAsDefaultProtocolClient(config.default.appProtocolPrefix);
}

/**
 * This is for mac [darwin]
 * so when someone tries to enter something like jitsi-meet://test
 * it will trigger this event below
 */
app.on('open-url', (event, data) => {
    event.preventDefault();
    handleProtocolCall(data);
});

/**
 * This is to notify main.js [this] that front app is ready to receive messages.
 */
ipcMain.on('renderer-ready', () => {
    rendererReady = true;
    if (protocolDataForFrontApp) {
        mainWindow
            .webContents
            .send('protocol-data-msg', protocolDataForFrontApp);
    }
});

/**
 * Handle opening external links in the main process.
 */
ipcMain.on('jitsi-open-url', (event, someUrl) => {
    openExternalLink(someUrl);
});