/*
Copyright 2018-2025 New Vector Ltd.
Copyright 2017-2019 Michael Telatynski <7t3chguy@gmail.com>
Copyright 2016 Aviral Dasgupta
Copyright 2016 OpenMarket Ltd

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
Please see LICENSE files in the repository root for full details.
*/

// Squirrel on windows starts the app with various flags as hooks to tell us when we've been installed/uninstalled etc.
import "./squirrelhooks.js";
import {
    app,
    BrowserWindow,
    Menu,
    autoUpdater,
    dialog,
    type Input,
    type Event,
    session,
    protocol,
    desktopCapturer,
} from "electron";
import * as Sentry from "@sentry/electron/main";
import path, { dirname } from "node:path";
import windowStateKeeper from "electron-window-state";
import { URL, fileURLToPath } from "node:url";

import "./ipc.js";
import "./seshat.js";
import "./settings.js";
import "./badge.js";
import * as tray from "./tray.js";
import Store from "./store.js";
import { buildMenuTemplate } from "./vectormenu.js";
import webContentsHandler from "./webcontents-handler.js";
import * as updater from "./updater.js";
import ProtocolHandler from "./protocol.js";
import { _t, AppLocalization } from "./language-helper.js";
import { setDisplayMediaCallback } from "./displayMediaCallback.js";
import { setupMacosTitleBar } from "./macos-titlebar.js";
import { setupMediaAuth } from "./media-auth.js";
import { type RendererRecovery, setupRendererRecovery } from "./renderer-recovery.js";
import { getBuildConfig } from "./build-config.js";
import { getAsarPath } from "./asar.js";
import { getIconPath } from "./icon.js";
import { getArgs } from "./args.js";
import { type ConfigOptions, loadConfig } from "./config.js";

const __dirname = dirname(fileURLToPath(import.meta.url));

const buildConfig = getBuildConfig();
const protocolHandler = new ProtocolHandler(buildConfig.protocol);
const args = getArgs(protocolHandler);

app.setPath("userData", args.userDataPath);

// Renderer crash auto-recovery for the main window (element-web#32222). Held at module scope so the
// dock `activate` / `second-instance` relaunch handlers can route a crashed renderer through the same
// capped recovery rather than reloading inline (which would re-arm an already-given-up crash loop).
let rendererRecovery: RendererRecovery | undefined;

// Configure Electron Sentry and crashReporter using sentry.dsn in config.json if one is present.
async function configureSentry(): Promise<void> {
    const config = await loadConfig(args.localConfigPath);
    const { dsn, environment } = config.sentry || {};
    if (dsn) {
        console.log(`Enabling Sentry with dsn=${dsn} environment=${environment}`);
        Sentry.init({
            dsn,
            environment,
            // We don't actually use this IPC, but we do not want Sentry injecting preloads
            ipcMode: Sentry.IPCMode.Classic,
        });
    }
}

global.appQuitting = false;

const exitShortcuts: Array<(input: Input, platform: string) => boolean> = [
    (input, platform): boolean => platform !== "darwin" && input.alt && input.key.toUpperCase() === "F4",
    (input, platform): boolean => platform !== "darwin" && input.control && input.key.toUpperCase() === "Q",
    (input, platform): boolean =>
        platform === "darwin" && input.meta && !input.control && input.key.toUpperCase() === "Q",
];

void configureSentry();

// handle uncaught errors otherwise it displays
// stack traces in popup dialogs, which is terrible (which
// it will do any time the auto update poke fails, and there's
// no other way to catch this error).
// Assuming we generally run from the console when developing,
// this is far preferable.
process.on("uncaughtException", function (error: Error): void {
    console.log("Unhandled exception", error);
});

app.commandLine.appendSwitch("--enable-usermedia-screen-capturing");
if (!app.commandLine.hasSwitch("enable-features")) {
    app.commandLine.appendSwitch("enable-features", "WebRTCPipeWireCapturer");
}

const gotLock = app.requestSingleInstanceLock();
if (!gotLock) {
    console.log("Other instance detected: exiting");
    app.exit();
}

// Register the scheme the app is served from as 'standard'
// which allows things like relative URLs and IndexedDB to
// work.
// Also mark it as secure (ie. accessing resources from this
// protocol and HTTPS won't trigger mixed content warnings).
protocol.registerSchemesAsPrivileged([
    {
        scheme: "vector",
        privileges: {
            standard: true,
            secure: true,
            supportFetchAPI: true,
        },
    },
]);

// Turn the sandbox on for *all* windows we might generate. Doing this means we don't
// have to specify a `sandbox: true` to each BrowserWindow.
//
// This also fixes an issue with window.open where if we only specified the sandbox
// on the main window we'd run into cryptic "ipc_renderer be broke" errors. Turns out
// it's trying to jump the sandbox and make some calls into electron, which it can't
// do when half of it is sandboxed. By turning on the sandbox for everything, the new
// window (no matter how temporary it may be) is also sandboxed, allowing for a clean
// transition into the user's browser.
app.enableSandbox();

// We disable media controls here. We do this because calls use audio and video elements and they sometimes capture the media keys. See https://github.com/vector-im/element-web/issues/15704
app.commandLine.appendSwitch("disable-features", "HardwareMediaKeyHandling,MediaSessionService");

const store = Store.initialize(args.storageMode); // must be called before any async actions

// Disable hardware acceleration if the setting has been set.
if (store.get("disableHardwareAcceleration")) {
    console.log("Disabling hardware acceleration.");
    app.disableHardwareAcceleration();
}

app.on("ready", async () => {
    console.debug("Reached Electron ready state");

    let asarPath: string;
    let config: ConfigOptions;

    try {
        asarPath = await getAsarPath();
        config = await loadConfig(args.localConfigPath);
    } catch (e) {
        console.log("App setup failed: exiting", e);
        process.exit(1);
        // process.exit doesn't cause node to stop running code immediately,
        // so return (we could let the exception propagate but then we end up
        // with node printing all sorts of stuff about unhandled exceptions
        // when we want the actual error to be as obvious as possible).
        return;
    }

    if (args.devtools) {
        try {
            const { installExtension, REACT_DEVELOPER_TOOLS } = await import("electron-devtools-installer");
            installExtension(REACT_DEVELOPER_TOOLS)
                .then((ext) => console.log(`Added Extension: ${ext.name}`))
                .catch((err: unknown) => console.log("An error occurred: ", err));
        } catch (e) {
            console.log(e);
        }
    }

    protocol.registerFileProtocol("vector", (request, callback) => {
        if (request.method !== "GET") {
            callback({ error: -322 }); // METHOD_NOT_SUPPORTED from chromium/src/net/base/net_error_list.h
            return null;
        }

        const parsedUrl = new URL(request.url);
        if (parsedUrl.protocol !== "vector:") {
            callback({ error: -302 }); // UNKNOWN_URL_SCHEME
            return;
        }
        if (parsedUrl.host !== "vector") {
            callback({ error: -105 }); // NAME_NOT_RESOLVED
            return;
        }

        const target = parsedUrl.pathname.split("/");

        // path starts with a '/'
        if (target[0] !== "") {
            callback({ error: -6 }); // FILE_NOT_FOUND
            return;
        }

        if (target[target.length - 1] == "") {
            target[target.length - 1] = "index.html";
        }

        let baseDir: string;
        if (target[1] === "webapp") {
            baseDir = asarPath;
        } else {
            callback({ error: -6 }); // FILE_NOT_FOUND
            return;
        }

        // Normalise the base dir and the target path separately, then make sure
        // the target path isn't trying to back out beyond its root
        baseDir = path.normalize(baseDir);

        const relTarget = path.normalize(path.join(...target.slice(2)));
        if (relTarget.startsWith("..")) {
            callback({ error: -6 }); // FILE_NOT_FOUND
            return;
        }
        const absTarget = path.join(baseDir, relTarget);

        callback({
            path: absTarget,
        });
    });

    if (!args.update) {
        console.log("Auto update disabled via command line flag");
    } else if (config.update_base_url) {
        void updater.start(config.update_base_url);
    } else {
        console.log("No update_base_url is defined: auto update is disabled");
    }

    // Set up i18n before loading storage as we need translations for dialogs
    global.appLocalization = new AppLocalization({
        components: [(): void => tray.initApplicationMenu(), (): void => Menu.setApplicationMenu(buildMenuTemplate())],
        store,
    });

    // Load the previous window state with fallback to defaults
    const mainWindowState = windowStateKeeper({
        defaultWidth: 1024,
        defaultHeight: 768,
    });

    console.debug("Opening main window");
    const preloadScript = path.normalize(`${__dirname}/preload.cjs`);
    global.mainWindow = new BrowserWindow({
        // https://www.electronjs.org/docs/faq#the-font-looks-blurry-what-is-this-and-what-can-i-do
        backgroundColor: "#fff",

        titleBarStyle: process.platform === "darwin" ? "hidden" : "default",
        trafficLightPosition: { x: 9, y: 8 },

        icon: await getIconPath(),
        show: false,
        autoHideMenuBar: store.get("autoHideMenuBar"),

        x: mainWindowState.x,
        y: mainWindowState.y,
        width: mainWindowState.width,
        height: mainWindowState.height,
        webPreferences: {
            preload: preloadScript,
            nodeIntegration: false,
            //sandbox: true, // We enable sandboxing from app.enableSandbox() above
            contextIsolation: true,
            webgl: true,
        },
    });

    global.mainWindow.setContentProtection(store.get("enableContentProtection"));

    try {
        console.debug("Ensuring storage is ready");
        if (!(await store.prepareSafeStorage(global.mainWindow.webContents.session))) return;
    } catch (e) {
        console.error(e);
        app.exit(1);
    }

    // do this after we know we are the primary instance of the app
    const hasDeeplink = protocolHandler.initialise(args);
    if (!hasDeeplink) {
        void global.mainWindow.loadURL("vector://vector/webapp/");
    }

    if (process.platform === "darwin") {
        setupMacosTitleBar(global.mainWindow);
    }

    // Handle spellchecker
    // For some reason spellCheckerEnabled isn't persisted, so we have to use the store here
    global.mainWindow.webContents.session.setSpellCheckerEnabled(store.get("spellCheckerEnabled", true));

    // Create trayIcon icon
    if (store.get("minimizeToTray")) await tray.create();

    global.mainWindow.once("ready-to-show", () => {
        if (!global.mainWindow) return;
        mainWindowState.manage(global.mainWindow);

        if (!args.hidden) {
            global.mainWindow.show();
        } else {
            // hide here explicitly because window manage above sometimes shows it
            global.mainWindow.hide();
        }
    });

    global.mainWindow.webContents.on("before-input-event", (event: Event, input: Input): void => {
        const exitShortcutPressed =
            input.type === "keyDown" && exitShortcuts.some((shortcutFn) => shortcutFn(input, process.platform));

        // We only care about the exit shortcuts here
        if (!exitShortcutPressed || !global.mainWindow) return;

        // Prevent the default behaviour
        event.preventDefault();

        // Let's ask the user if they really want to exit the app
        const shouldWarnBeforeExit = store.get("warnBeforeExit", true);
        if (shouldWarnBeforeExit) {
            const shouldCancelCloseRequest =
                dialog.showMessageBoxSync(global.mainWindow, {
                    type: "question",
                    buttons: [
                        _t("action|cancel"),
                        _t("action|close_brand", {
                            brand: config.brand,
                        }),
                    ],
                    message: _t("confirm_quit"),
                    defaultId: 1,
                    cancelId: 0,
                }) === 0;
            if (shouldCancelCloseRequest) return;
        }

        // Exit the app
        app.exit();
    });

    global.mainWindow.on("closed", () => {
        global.mainWindow = null;
    });
    global.mainWindow.on("close", async (e) => {
        // If we are not quitting and have a tray icon then minimize to tray
        if (!global.appQuitting && (tray.hasTray() || process.platform === "darwin")) {
            // On Mac, closing the window just hides it
            // (this is generally how single-window Mac apps
            // behave, eg. Mail.app)
            e.preventDefault();

            if (global.mainWindow?.isFullScreen()) {
                global.mainWindow.once("leave-full-screen", () => global.mainWindow?.hide());

                global.mainWindow.setFullScreen(false);
            } else {
                global.mainWindow?.hide();
            }

            return false;
        }
    });

    if (process.platform === "win32") {
        // Handle forward/backward mouse buttons in Windows
        global.mainWindow.on("app-command", (e, cmd) => {
            if (cmd === "browser-backward" && global.mainWindow?.webContents.canGoBack()) {
                global.mainWindow.webContents.goBack();
            } else if (cmd === "browser-forward" && global.mainWindow?.webContents.canGoForward()) {
                global.mainWindow.webContents.goForward();
            }
        });
    }

    webContentsHandler(global.mainWindow.webContents);

    // Auto-recover from an upstream renderer/GPU-process crash (white screen, element-web#32222). This
    // is a MITIGATION of an upstream Electron/Chromium defect, not a root-cause fix — without it a dead
    // renderer stays a permanent blank window the user can only escape by killing the whole app.
    rendererRecovery = setupRendererRecovery(global.mainWindow);

    session.defaultSession.setDisplayMediaRequestHandler(
        (_, callback) => {
            if (process.env.XDG_SESSION_TYPE === "wayland") {
                // On Wayland, calling getSources() opens the xdg-desktop-portal picker.
                // The user can only select a single source there, so Electron will return an array with exactly one entry.
                desktopCapturer
                    .getSources({ types: ["screen", "window"] })
                    .then((sources) => {
                        // oxlint-disable-next-line promise/no-callback-in-promise
                        callback({ video: sources[0] });
                    })
                    .catch((err) => {
                        // If the user cancels the dialog an error occurs "Failed to get sources"
                        console.error("Wayland: failed to get user-selected source:", err);
                        // oxlint-disable-next-line promise/no-callback-in-promise
                        callback({ video: { id: "", name: "" } }); // The promise does not return if no dummy is passed here as source
                    });
            } else {
                global.mainWindow?.webContents.send("openDesktopCapturerSourcePicker");
            }
            setDisplayMediaCallback(callback);
        },
        { useSystemPicker: true },
    ); // Use Mac OS 15+ native picker

    setupMediaAuth(global.mainWindow);
});

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

app.on("activate", () => {
    // If the renderer crashed while the window was hidden (element-web#32222), reload it before showing
    // so the user sees the UI rather than the white screen. Routed through the capped recovery (rather
    // than an inline reload) so a relaunch can't re-arm a crash loop we've already given up on; it is a
    // no-op when the renderer is healthy.
    rendererRecovery?.recoverIfCrashed();
    global.mainWindow?.show();
});

function beforeQuit(): void {
    global.appQuitting = true;
    global.mainWindow?.webContents.send("before-quit");
}

app.on("before-quit", beforeQuit);
autoUpdater.on("before-quit-for-update", beforeQuit);

app.on("second-instance", (ev, commandLine, workingDirectory) => {
    // If other instance launched with --hidden then skip showing window
    if (commandLine.includes("--hidden")) return;

    // Someone tried to run a second instance, we should focus our window.
    if (global.mainWindow) {
        // If the renderer crashed (element-web#32222), reload before surfacing the window so the user is
        // brought to a working UI rather than a white screen. Routed through the capped recovery so a
        // relaunch can't re-arm a crash loop we've already given up on; a no-op for a healthy window.
        rendererRecovery?.recoverIfCrashed();
        if (!global.mainWindow.isVisible()) global.mainWindow.show();
        if (global.mainWindow.isMinimized()) global.mainWindow.restore();
        global.mainWindow.focus();
    }
});

// This is required to make notification handlers work
// on Windows 8.1/10/11 (and is a noop on other platforms);
// It must also match the ID found in 'electron-builder'
// in order to get the title and icon to show up correctly.
// Ref: https://stackoverflow.com/a/77314604/3525780
app.setAppUserModelId(buildConfig.appId);