const { app, BrowserWindow, shell, ipcMain } = require('electron');
const path = require('path');

let mainWindow = null;

const isDev = process.env.NODE_ENV === 'development' || !app.isPackaged;

const gotTheLock = app.requestSingleInstanceLock();
if (!gotTheLock) {
    console.log('Another instance is already running, quitting...');
    app.quit();
    process.exit(0);
} else {
    app.on('second-instance', (event, commandLine, workingDirectory) => {
        console.log('Second instance detected, focusing existing window...');
        if (mainWindow) {
            if (mainWindow.isMinimized()) mainWindow.restore();
            mainWindow.focus();
            mainWindow.show();
        }
    });
}

function createWindow() {
    mainWindow = new BrowserWindow({
        width: 1200,
        height: 800,
        minWidth: 800,
        minHeight: 600,
        title: 'Termix',
        icon: isDev 
            ? path.join(__dirname, '..', 'public', 'icon.png')
            : path.join(process.resourcesPath, 'public', 'icon.png'),
        webPreferences: {
            nodeIntegration: false,
            contextIsolation: true,
            webSecurity: !isDev
        },
        show: false
    });

    if (process.platform !== 'darwin') {
        mainWindow.setMenuBarVisibility(false);
    }

    if (isDev) {
        mainWindow.loadURL('http://localhost:5173');
        mainWindow.webContents.openDevTools();
    } else {
        const indexPath = path.join(__dirname, '..', 'dist', 'index.html');
        console.log('Loading frontend from:', indexPath);
        mainWindow.loadFile(indexPath);
    }

    mainWindow.once('ready-to-show', () => {
        console.log('Window ready to show');
        mainWindow.show();
    });

    mainWindow.webContents.on('did-fail-load', (event, errorCode, errorDescription, validatedURL) => {
        console.error('Failed to load:', errorCode, errorDescription, validatedURL);
    });

    mainWindow.webContents.on('did-finish-load', () => {
        console.log('Frontend loaded successfully');
    });

    mainWindow.on('close', (event) => {
        if (process.platform === 'darwin') {
            event.preventDefault();
            mainWindow.hide();
        }
    });

    mainWindow.on('closed', () => {
        mainWindow = null;
    });

    mainWindow.webContents.setWindowOpenHandler(({ url }) => {
        shell.openExternal(url);
        return { action: 'deny' };
    });
}

ipcMain.handle('get-app-version', () => {
    return app.getVersion();
});

ipcMain.handle('get-platform', () => {
    return process.platform;
});

app.whenReady().then(() => {
    createWindow();
    console.log('Termix started successfully');
});

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

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

app.on('before-quit', () => {
    console.log('App is quitting...');
});

app.on('will-quit', () => {
    console.log('App will quit...');
});

process.on('uncaughtException', (error) => {
    console.error('Uncaught Exception:', error);
});

process.on('unhandledRejection', (reason, promise) => {
    console.error('Unhandled Rejection at:', promise, 'reason:', reason);
});