const { app, BrowserWindow, session, desktopCapturer, ipcMain, clipboard } = require('electron');
const { autoUpdater } = require('electron-updater');
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,
            preload: path.join(__dirname, 'desktop', 'preload.js')
        }
    });

    win.setAutoHideMenuBar(true);
    win.setMenuBarVisibility(false);

    ipcMain.handle('get-config', () => {
        return {
            backendUrl: (process.env.CHATTZ_URL || 'https://discord.flegr.me').replace(/\/$/, '')
        };
    });

    ipcMain.handle('clipboard-write', (event, text) => {
        clipboard.writeText(text);
        return true;
    });

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

    sess.setPermissionRequestHandler((webContents, permission, callback) => {
        if (permission === 'media' || permission === 'clipboard-read' || permission === 'clipboard-write') {
            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');

    const loadDesktopApp = (queryParams = '') => {
        const options = {};
        if (queryParams) {
            try {
                options.query = Object.fromEntries(new URLSearchParams(queryParams));
            } catch (e) {
                console.error("Failed to parse query params", e);
            }
        }

        // Use setImmediate to ensure the current navigation tick is cleared,
        // which prevents ERR_ABORTED (-3) on some platforms when interrupting a redirect.
        setImmediate(() => {
            if (win.isDestroyed()) return;
            win.loadFile(indexPath, options).catch((err) => {
                // Ignore aborted errors as they often happen during fast redirects
                if (err.toString().includes('-3') || err.code === -3) return;
                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) => {
        try {
            const urlObj = new URL(navigatedUrl);
            const backendObj = new URL(backendUrl);
            // Detect the redirect back to the home page with a token
            if (urlObj.origin === backendObj.origin && urlObj.pathname === '/') {
                if (urlObj.searchParams.has('token')) {
                    console.log("Detected login success redirect, returning to desktop UI...");
                    event.preventDefault();
                    loadDesktopApp(urlObj.search.slice(1));
                }
            }
        } catch (e) {
            console.error(e);
        }
    });

    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();

    // Configure Auto-Updater
    autoUpdater.autoDownload = false;
    autoUpdater.logger = console;

    autoUpdater.on('update-available', (info) => {
        const wins = BrowserWindow.getAllWindows();
        if (wins.length > 0) wins[0].webContents.send('update-available', info);
    });

    autoUpdater.on('update-downloaded', (info) => {
        const wins = BrowserWindow.getAllWindows();
        if (wins.length > 0) wins[0].webContents.send('update-downloaded', info);
    });

    autoUpdater.on('error', (err) => {
        const wins = BrowserWindow.getAllWindows();
        if (wins.length > 0) wins[0].webContents.send('update-error', err.message);
    });

    ipcMain.on('check-for-updates', () => {
        autoUpdater.checkForUpdatesAndNotify().catch(err => {
            console.error("Manual update check failed", err);
        });
    });

    ipcMain.on('download-update', () => {
        autoUpdater.downloadUpdate();
    });

    ipcMain.on('quit-and-install', () => {
        autoUpdater.quitAndInstall();
    });

    // Check once on startup
    setTimeout(() => {
        autoUpdater.checkForUpdatesAndNotify().catch(() => { });
    }, 5000);

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

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