import { app, BrowserWindow } from 'electron';
import { join } from 'path';
import { URL } from 'url';

const isSingleInstance = app.requestSingleInstanceLock();
const isDevelopment = import.meta.env.MODE === 'development';

if (!isSingleInstance) {
  app.quit();
  process.exit(0);
}

app.enableSandbox();

if (isDevelopment) {
  app.whenReady().then(async () => {
    const {
      default: installExtension,
      MOBX_DEVTOOLS,
      REACT_DEVELOPER_TOOLS,
    } = await import('electron-devtools-installer');
    installExtension(
      [
        MOBX_DEVTOOLS,
        REACT_DEVELOPER_TOOLS,
      ],
      {
        forceDownload: false,
        loadExtensionOptions: {
          allowFileAccess: true,
        },
      },
    );
  }).catch((err) => {
    console.error('Failed to install devtools extension', err);
  });
}

let mainWindow: BrowserWindow | null = null;

function createWindow(): Promise<void> {
  mainWindow = new BrowserWindow({
    show: false,
    webPreferences: {
      nativeWindowOpen: true,
      webviewTag: false,
      sandbox: true,
      preload: join(__dirname, '../../preload/dist/index.cjs'),
    }
  });

  // See https://github.com/MarshallOfSound/electron-devtools-installer/issues/195#issuecomment-998872878
  if (isDevelopment) {
    const { webContents } = mainWindow;
    webContents.once('dom-ready', () => {
      webContents.once('devtools-opened', () => {
        mainWindow?.focus();
      });
      webContents.openDevTools();
    });
  }

  mainWindow.on('ready-to-show', () => {
    mainWindow?.show();
  });

  const pageUrl = (isDevelopment && import.meta.env.VITE_DEV_SERVER_URL !== undefined)
    ? import.meta.env.VITE_DEV_SERVER_URL
    : new URL('../renderer/dist/index.html', `file://${__dirname}`).toString();

  return mainWindow.loadURL(pageUrl);
}

app.on('second-instance', () => {
  if (mainWindow !== null) {
    if (!mainWindow.isVisible()) {
      mainWindow.show();
    }
    if (mainWindow.isMinimized()) {
      mainWindow.restore();
    }
    mainWindow.focus();
  }
});

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

app.whenReady().then(createWindow).catch((err) => {
  console.error('Failed to create window', err);
  process.exit(1);
});