/*
Copyright 2018-2024 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
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, protocol, dialog, Input, Event, session } from "electron";
// eslint-disable-next-line n/file-extension-in-import
import * as Sentry from "@sentry/electron/main";
import AutoLaunch from "auto-launch";
import path, { dirname } from "node:path";
import windowStateKeeper from "electron-window-state";
import Store from "electron-store";
import fs, { promises as afs } from "node:fs";
import { URL, fileURLToPath } from "node:url";
import minimist from "minimist";

import "./ipc.js";
import "./keytar.js";
import "./seshat.js";
import "./settings.js";
import * as tray from "./tray.js";
import { buildMenuTemplate } from "./vectormenu.js";
import webContentsHandler from "./webcontents-handler.js";
import * as updater from "./updater.js";
import { getProfileFromDeeplink, protocolInit } from "./protocol.js";
import { _t, AppLocalization } from "./language-helper.js";
import { setDisplayMediaCallback } from "./displayMediaCallback.js";
import { setupMacosTitleBar } from "./macos-titlebar.js";
import { loadJsonFile } from "./utils.js";
import { setupMediaAuth } from "./media-auth.js";

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

const argv = minimist(process.argv, {
    alias: { help: "h" },
});

if (argv["help"]) {
    console.log("Options:");
    console.log("  --profile-dir {path}: Path to where to store the profile.");
    console.log("  --profile {name}:     Name of alternate profile to use, allows for running multiple accounts.");
    console.log("  --devtools:           Install and use react-devtools and react-perf.");
    console.log(
        `  --config:             Path to the config.json file. May also be specified via the ELEMENT_DESKTOP_CONFIG_JSON environment variable.\n` +
            `                         Otherwise use the default user location '${app.getPath("userData")}'`,
    );
    console.log("  --no-update:          Disable automatic updating.");
    console.log("  --hidden:             Start the application hidden in the system tray.");
    console.log("  --help:               Displays this help message.");
    console.log("And more such as --proxy, see:" + "https://electronjs.org/docs/api/command-line-switches");
    app.exit();
}

const LocalConfigLocation = process.env.ELEMENT_DESKTOP_CONFIG_JSON ?? argv["config"];

// Electron creates the user data directory (with just an empty 'Dictionaries' directory...)
// as soon as the app path is set, so pick a random path in it that must exist if it's a
// real user data directory.
function isRealUserDataDir(d: string): boolean {
    return fs.existsSync(path.join(d, "IndexedDB"));
}

// check if we are passed a profile in the SSO callback url
let userDataPath: string;

const userDataPathInProtocol = getProfileFromDeeplink(argv["_"]);
if (userDataPathInProtocol) {
    userDataPath = userDataPathInProtocol;
} else if (argv["profile-dir"]) {
    userDataPath = argv["profile-dir"];
} else {
    let newUserDataPath = app.getPath("userData");
    if (argv["profile"]) {
        newUserDataPath += "-" + argv["profile"];
    }
    const newUserDataPathExists = isRealUserDataDir(newUserDataPath);
    let oldUserDataPath = path.join(app.getPath("appData"), app.getName().replace("Element", "Riot"));
    if (argv["profile"]) {
        oldUserDataPath += "-" + argv["profile"];
    }

    const oldUserDataPathExists = isRealUserDataDir(oldUserDataPath);
    console.log(newUserDataPath + " exists: " + (newUserDataPathExists ? "yes" : "no"));
    console.log(oldUserDataPath + " exists: " + (oldUserDataPathExists ? "yes" : "no"));
    if (!newUserDataPathExists && oldUserDataPathExists) {
        console.log("Using legacy user data path: " + oldUserDataPath);
        userDataPath = oldUserDataPath;
    } else {
        userDataPath = newUserDataPath;
    }
}
app.setPath("userData", userDataPath);

async function tryPaths(name: string, root: string, rawPaths: string[]): Promise<string> {
    // Make everything relative to root
    const paths = rawPaths.map((p) => path.join(root, p));

    for (const p of paths) {
        try {
            await afs.stat(p);
            return p + "/";
        } catch {}
    }
    console.log(`Couldn't find ${name} files in any of: `);
    for (const p of paths) {
        console.log("\t" + path.resolve(p));
    }
    throw new Error(`Failed to find ${name} files`);
}

const homeserverProps = ["default_is_url", "default_hs_url", "default_server_name", "default_server_config"] as const;

let asarPathPromise: Promise<string> | undefined;
// Get the webapp resource file path, memoizes result
function getAsarPath(): Promise<string> {
    if (!asarPathPromise) {
        asarPathPromise = tryPaths("webapp", __dirname, [
            // If run from the source checkout, this will be in the directory above
            "../webapp.asar",
            // but if run from a packaged application, electron-main.js will be in
            // a different asar file, so it will be two levels above
            "../../webapp.asar",
            // also try without the 'asar' suffix to allow symlinking in a directory
            "../webapp",
            // from a packaged application
            "../../webapp",
        ]);
    }

    return asarPathPromise;
}

// Loads the config from asar, and applies a config.json from userData atop if one exists
// Writes config to `global.vectorConfig`. Does nothing if `global.vectorConfig` is already set.
async function loadConfig(): Promise<void> {
    if (global.vectorConfig) return;

    const asarPath = await getAsarPath();

    try {
        global.vectorConfig = loadJsonFile(asarPath, "config.json");
    } catch {
        // it would be nice to check the error code here and bail if the config
        // is unparsable, but we get MODULE_NOT_FOUND in the case of a missing
        // file or invalid json, so node is just very unhelpful.
        // Continue with the defaults (ie. an empty config)
        global.vectorConfig = {};
    }

    try {
        // Load local config and use it to override values from the one baked with the build
        const localConfig = LocalConfigLocation
            ? loadJsonFile(LocalConfigLocation)
            : loadJsonFile(app.getPath("userData"), "config.json");

        // If the local config has a homeserver defined, don't use the homeserver from the build
        // config. This is to avoid a problem where Riot thinks there are multiple homeservers
        // defined, and panics as a result.
        if (Object.keys(localConfig).find((k) => homeserverProps.includes(<any>k))) {
            // Rip out all the homeserver options from the vector config
            global.vectorConfig = Object.keys(global.vectorConfig)
                .filter((k) => !homeserverProps.includes(<any>k))
                .reduce(
                    (obj, key) => {
                        obj[key] = global.vectorConfig[key];
                        return obj;
                    },
                    {} as Omit<Partial<(typeof global)["vectorConfig"]>, keyof typeof homeserverProps>,
                );
        }

        global.vectorConfig = Object.assign(global.vectorConfig, localConfig);
    } catch (e) {
        if (e instanceof SyntaxError) {
            void dialog.showMessageBox({
                type: "error",
                title: `Your ${global.vectorConfig.brand || "Element"} is misconfigured`,
                message:
                    `Your custom ${global.vectorConfig.brand || "Element"} configuration contains invalid JSON. ` +
                    `Please correct the problem and reopen ${global.vectorConfig.brand || "Element"}.`,
                detail: e.message || "",
            });
        }

        // Could not load local config, this is expected in most cases.
    }
}

// Configure Electron Sentry and crashReporter using sentry.dsn in config.json if one is present.
async function configureSentry(): Promise<void> {
    await loadConfig();
    const { dsn, environment } = global.vectorConfig.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,
        });
    }
}

// Set up globals for Tray and AutoLaunch
async function setupGlobals(): Promise<void> {
    const asarPath = await getAsarPath();
    await loadConfig();

    // we assume the resources path is in the same place as the asar
    const resPath = await tryPaths("res", path.dirname(asarPath), [
        // If run from the source checkout
        "res",
        // if run from packaged application
        "",
    ]);

    // The tray icon
    // It's important to call `path.join` so we don't end up with the packaged asar in the final path.
    const iconFile = `element.${process.platform === "win32" ? "ico" : "png"}`;
    global.trayConfig = {
        icon_path: path.join(resPath, "img", iconFile),
        brand: global.vectorConfig.brand || "Element",
    };

    // launcher
    global.launcher = new AutoLaunch({
        name: global.vectorConfig.brand || "Element",
        isHidden: true,
        mac: {
            useLaunchAgent: true,
        },
    });
}

// Look for an auto-launcher under 'Riot' and if we find one,
// port its enabled/disabled-ness over to the new 'Element' launcher
async function moveAutoLauncher(): Promise<void> {
    if (!global.vectorConfig.brand || global.vectorConfig.brand === "Element") {
        const oldLauncher = new AutoLaunch({
            name: "Riot",
            isHidden: true,
            mac: {
                useLaunchAgent: true,
            },
        });
        const wasEnabled = await oldLauncher.isEnabled();
        if (wasEnabled) {
            await oldLauncher.disable();
            await global.launcher.enable();
        }
    }
}

global.store = new Store({ name: "electron-config" });

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",
];

const warnBeforeExit = (event: Event, input: Input): void => {
    const shouldWarnBeforeExit = global.store.get("warnBeforeExit", true);
    const exitShortcutPressed =
        input.type === "keyDown" && exitShortcuts.some((shortcutFn) => shortcutFn(input, process.platform));

    if (shouldWarnBeforeExit && exitShortcutPressed && global.mainWindow) {
        const shouldCancelCloseRequest =
            dialog.showMessageBoxSync(global.mainWindow, {
                type: "question",
                buttons: [
                    _t("action|cancel"),
                    _t("action|close_brand", {
                        brand: global.vectorConfig.brand || "Element",
                    }),
                ],
                message: _t("confirm_quit"),
                defaultId: 1,
                cancelId: 0,
            }) === 0;

        if (shouldCancelCloseRequest) {
            event.preventDefault();
        }
    }
};

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();
}

// do this after we know we are the primary instance of the app
protocolInit();

// 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");

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

app.on("ready", async () => {
    let asarPath: string;

    try {
        asarPath = await getAsarPath();
        await setupGlobals();
        await moveAutoLauncher();
    } 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 (argv["devtools"]) {
        try {
            const { default: installExt, REACT_DEVELOPER_TOOLS } = await import("electron-devtools-installer");
            installExt(REACT_DEVELOPER_TOOLS)
                .then((name: string) => console.log(`Added Extension: ${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 (argv["no-update"]) {
        console.log('Auto update disabled via command line flag "--no-update"');
    } else if (global.vectorConfig["update_base_url"]) {
        console.log(`Starting auto update with base URL: ${global.vectorConfig["update_base_url"]}`);
        void updater.start(global.vectorConfig["update_base_url"]);
    } else {
        console.log("No update_base_url is defined: auto update is disabled");
    }

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

    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: global.trayConfig.icon_path,
        show: false,
        autoHideMenuBar: global.store.get("autoHideMenuBar", true),

        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,
        },
    });
    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(global.store.get("spellCheckerEnabled", true));

    // Create trayIcon icon
    if (global.store.get("minimizeToTray", true)) tray.create(global.trayConfig);

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

        if (!argv["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", warnBeforeExit);

    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);

    global.appLocalization = new AppLocalization({
        store: global.store,
        components: [(): void => tray.initApplicationMenu(), (): void => Menu.setApplicationMenu(buildMenuTemplate())],
    });

    session.defaultSession.setDisplayMediaRequestHandler((_, callback) => {
        global.mainWindow?.webContents.send("openDesktopCapturerSourcePicker");
        setDisplayMediaCallback(callback);
    });

    setupMediaAuth(global.mainWindow);
});

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

app.on("activate", () => {
    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 (!global.mainWindow.isVisible()) global.mainWindow.show();
        if (global.mainWindow.isMinimized()) global.mainWindow.restore();
        global.mainWindow.focus();
    }
});

// Set the App User Model ID to match what the squirrel
// installer uses for the shortcut icon.
// This makes notifications work on windows 8.1 (and is
// a noop on other platforms).
app.setAppUserModelId("com.squirrel.element-desktop.Element");