const { app, BrowserWindow, Menu, shell, dialog } = require('electron');
const { autoUpdater } = require('electron-updater');
const path = require('path');

// Keep a global reference of the window object
let mainWindow;

function createWindow() {
  // Create the browser window
  mainWindow = new BrowserWindow({
    width: 1200,
    height: 800,
    minWidth: 800,
    minHeight: 600,
    icon: path.join(__dirname, 'img/logo.png'),
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true,
      enableRemoteModule: false,
      webSecurity: true
    },
    show: false // Don't show until ready
  });

  // Load the home page
  mainWindow.loadFile(path.join(__dirname, 'home.html'));

  // Show window when ready to prevent visual flash
  mainWindow.once('ready-to-show', () => {
    mainWindow.show();
  });

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

  // Emitted when the window is closed
  mainWindow.on('closed', () => {
    mainWindow = null;
  });

  // Create application menu
  createMenu();
}

function createMenu() {
  const template = [
    {
      label: 'File',
      submenu: [
        {
          label: 'New Note',
          accelerator: 'CmdOrCtrl+N',
          click: () => {
            mainWindow.loadFile(path.join(__dirname, 'index.html'));
          }
        },
        {
          label: 'Home',
          accelerator: 'CmdOrCtrl+H',
          click: () => {
            mainWindow.loadFile(path.join(__dirname, 'home.html'));
          }
        },
        { type: 'separator' },
        {
          label: 'Check for Updates',
          click: () => {
            autoUpdater.checkForUpdatesAndNotify();
          }
        },
        { type: 'separator' },
        {
          label: 'Quit',
          accelerator: process.platform === 'darwin' ? 'Cmd+Q' : 'Ctrl+Q',
          click: () => {
            app.quit();
          }
        }
      ]
    },
    {
      label: 'Edit',
      submenu: [
        { role: 'undo' },
        { role: 'redo' },
        { type: 'separator' },
        { role: 'cut' },
        { role: 'copy' },
        { role: 'paste' },
        { role: 'selectall' }
      ]
    },
    {
      label: 'View',
      submenu: [
        { role: 'reload' },
        { role: 'forceReload' },
        { role: 'toggleDevTools' },
        { type: 'separator' },
        { role: 'resetZoom' },
        { role: 'zoomIn' },
        { role: 'zoomOut' },
        { type: 'separator' },
        { role: 'togglefullscreen' }
      ]
    },
    {
      label: 'Window',
      submenu: [
        { role: 'minimize' },
        { role: 'close' }
      ]
    }
  ];

  // macOS specific menu adjustments
  if (process.platform === 'darwin') {
    template.unshift({
      label: app.getName(),
      submenu: [
        { role: 'about' },
        { type: 'separator' },
        { role: 'services' },
        { type: 'separator' },
        { role: 'hide' },
        { role: 'hideothers' },
        { role: 'unhide' },
        { type: 'separator' },
        { role: 'quit' }
      ]
    });

    // Window menu
    template[4].submenu = [
      { role: 'close' },
      { role: 'minimize' },
      { role: 'zoom' },
      { type: 'separator' },
      { role: 'front' }
    ];
  }

  const menu = Menu.buildFromTemplate(template);
  Menu.setApplicationMenu(menu);
}

// Auto-updater configuration
function setupAutoUpdater() {
  // Configure auto-updater
  autoUpdater.checkForUpdatesAndNotify();

  // Auto-updater events
  autoUpdater.on('checking-for-update', () => {
    console.log('Checking for update...');
  });

  autoUpdater.on('update-available', (info) => {
    console.log('Update available:', info);

    dialog.showMessageBox(mainWindow, {
      type: 'info',
      title: 'Update Available',
      message: 'A new version is available. It will be downloaded in the background.',
      detail: `Version ${info.version} is now available. The update will be downloaded and installed automatically.`,
      buttons: ['OK']
    });
  });

  autoUpdater.on('update-not-available', (info) => {
    console.log('Update not available:', info);
  });

  autoUpdater.on('error', (err) => {
    console.error('Error in auto-updater:', err);
  });

  autoUpdater.on('download-progress', (progressObj) => {
    let log_message = "Download speed: " + progressObj.bytesPerSecond;
    log_message = log_message + ' - Downloaded ' + progressObj.percent + '%';
    log_message = log_message + ' (' + progressObj.transferred + "/" + progressObj.total + ')';
    console.log(log_message);
  });

  autoUpdater.on('update-downloaded', (info) => {
    console.log('Update downloaded:', info);

    dialog.showMessageBox(mainWindow, {
      type: 'info',
      title: 'Update Ready',
      message: 'Update downloaded and ready to install',
      detail: 'The application will restart to apply the update.',
      buttons: ['Restart Now', 'Later']
    }).then((result) => {
      if (result.response === 0) {
        autoUpdater.quitAndInstall();
      }
    });
  });
}

// This method will be called when Electron has finished initialization
app.whenReady().then(() => {
  createWindow();

  // Set up auto-updater after window is created
  setTimeout(() => {
    setupAutoUpdater();
  }, 3000); // Wait 3 seconds after app start

  app.on('activate', () => {
    // On macOS, re-create a window when the dock icon is clicked
    if (BrowserWindow.getAllWindows().length === 0) {
      createWindow();
    }
  });
});

// Quit when all windows are closed
app.on('window-all-closed', () => {
  // On macOS, keep the app running even when all windows are closed
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

// Security: Prevent new window creation
app.on('web-contents-created', (event, contents) => {
  contents.on('new-window', (event, url) => {
    event.preventDefault();
    shell.openExternal(url);
  });
});