const { app, BrowserWindow, session, desktopCapturer } = require('electron');
const path = require('path');
const url = require('url');

function createWindow() {
    // Create a persistent session for chattz to keep the user logged in
    const sess = session.fromPartition('persist:chattz');

    const win = new BrowserWindow({
        width: 1200,
        height: 800,
        title: "Chattz Desktop",
        webPreferences: {
            nodeIntegration: false,
            contextIsolation: true,
            webSecurity: false, // Required for cross-origin fetch/ws from file:// with cookies
            session: sess
        }
    });

    // Auto-approve media permissions (camera, microphone)
    sess.setPermissionCheckHandler((webContents, permission) => {
        if (permission === 'media') {
            return true;
        }
        return false;
    });

    sess.setPermissionRequestHandler((webContents, permission, callback) => {
        if (permission === 'media') {
            callback(true);
        } else {
            callback(false);
        }
    });

    // Handle screen share requests
    sess.setDisplayMediaRequestHandler((request, callback) => {
        desktopCapturer.getSources({ types: ['screen', 'window'] }).then((sources) => {
            // Provide the first screen source by default, or implement a picker window here
            if (sources && sources.length > 0) {
                // We prefer a screen over a window if available, simple heuristic
                const screenSource = sources.find(s => s.id.startsWith('screen')) || sources[0];
                callback({ video: screenSource, audio: 'loopback' });
            } else {
                callback(null); // Reject safely
            }
        }).catch(err => {
            console.error("Failed to get desktop sources for screen share", err);
            callback(null);
        });
    });

    const backendUrl = (process.env.CHATTZ_URL || 'https://discord.flegr.me').replace(/\/$/, '');
    const indexPath = path.join(__dirname, 'desktop', 'index.html');

    // Construct the local file URL with the backend parameter
    const localUrl = url.format({
        pathname: indexPath,
        protocol: 'file:',
        slashes: true,
        query: { backend: backendUrl }
    });

    console.log(`Loading desktop app from: ${localUrl}`);

    const loadDesktopApp = () => {
        win.loadURL(localUrl).catch((err) => {
            console.error(`Failed to load desktop file: ${err}`);
        });
    };

    // Use a navigation listener to detect when the remote login is complete
    win.webContents.on('will-navigate', (event, navigatedUrl) => {
        const normalizedNav = navigatedUrl.replace(/\/$/, '');
        // If the user lands back on the remote root, they are logged in.
        // Redirect them back to our local bugfixed desktop UI.
        if (normalizedNav === backendUrl) {
            console.log("Detected remote landing (login success), returning to desktop UI...");
            event.preventDefault();
            loadDesktopApp();
        }
    });

    win.webContents.on('did-navigate', (event, navigatedUrl) => {
        const normalizedNav = navigatedUrl.replace(/\/$/, '');
        if (normalizedNav === backendUrl) {
            loadDesktopApp();
        }
    });

    loadDesktopApp();

    // Uncomment to debug
    // win.webContents.openDevTools();
}

app.commandLine.appendSwitch('disable-webrtc-hw-encoding'); // Sometime helps resolve codec mismatch behavior
app.commandLine.appendSwitch('log-level', '3'); // Silences standard Chromium warning logs (like SRTP transport unprotect logs which are benign timing issues)

app.whenReady().then(() => {
    createWindow();

    app.on('activate', () => {
        if (BrowserWindow.getAllWindows().length === 0) {
            createWindow();
        }
    });
});

app.on('window-all-closed', () => {
    if (process.platform !== 'darwin') {
        app.quit();
    }
});