// Print diagnostic information for a few arguments instead of running Hyper.
if (['--help', '-v', '--version'].includes(process.argv[1])) {
  const {version} = require('./package');
  const configLocation = process.platform === 'win32' ? process.env.userprofile + '\\.hyper.js' : '~/.hyper.js';
  console.log(`Hyper version ${version}`);
  console.log('Hyper does not accept any command line arguments. Please modify the config file instead.');
  console.log(`Hyper configuration file located at: ${configLocation}`);
  // eslint-disable-next-line unicorn/no-process-exit
  process.exit();
}

const checkSquirrel = () => {
  let squirrel;

  try {
    squirrel = require('electron-squirrel-startup');
  } catch (err) {}

  if (squirrel) {
    // eslint-disable-next-line unicorn/no-process-exit
    process.exit();
  }
};

// handle startup squirrel events
if (process.platform === 'win32') {
  // eslint-disable-next-line import/order
  const systemContextMenu = require('./system-context-menu');

  switch (process.argv[1]) {
    case '--squirrel-install':
    case '--squirrel-updated':
      systemContextMenu.add(() => {
        checkSquirrel();
      });
      break;
    case '--squirrel-uninstall':
      systemContextMenu.remove(() => {
        checkSquirrel();
      });
      break;
    default:
      checkSquirrel();
  }
}

// Native
const {resolve} = require('path');

// Packages
const {app, BrowserWindow, Menu} = require('electron');
const {gitDescribe} = require('git-describe');
const isDev = require('electron-is-dev');

const AppMenu = require('./menus/menu');
const config = require('./config');

// set up config
config.setup();

const plugins = require('./plugins');

const Window = require('./ui/window');

const windowSet = new Set([]);

// expose to plugins
app.config = config;
app.plugins = plugins;
app.getWindows = () => new Set([...windowSet]); // return a clone

// function to retrieve the last focused window in windowSet;
// added to app object in order to expose it to plugins.
app.getLastFocusedWindow = () => {
  if (!windowSet.size) {
    return null;
  }
  return Array.from(windowSet).reduce((lastWindow, win) => {
    return win.focusTime > lastWindow.focusTime ? win : lastWindow;
  });
};

if (isDev) {
  console.log('running in dev mode');

  // Overide default appVersion which is set from package.json
  gitDescribe({customArguments: ['--tags']}, (error, gitInfo) => {
    if (!error) {
      app.setVersion(gitInfo.raw);
    }
  });
} else {
  console.log('running in prod mode');
}

const url = 'file://' + resolve(
  isDev ? __dirname : app.getAppPath(),
  'index.html'
);

console.log('electron will open', url);

app.on('ready', () => installDevExtensions(isDev).then(() => {
  function createWindow(fn, options = {}) {
    const cfg = plugins.getDecoratedConfig();

    const winSet = config.getWin();
    let [startX, startY] = winSet.position;

    const [width, height] = options.size ? options.size : (cfg.windowSize || winSet.size);
    const {screen} = require('electron');

    const winPos = options.position;

    // Open the new window roughly the height of the header away from the
    // previous window. This also ensures in multi monitor setups that the
    // new terminal is on the correct screen.
    const focusedWindow = BrowserWindow.getFocusedWindow() || app.getLastFocusedWindow();
    // In case of options defaults position and size, we should ignore the focusedWindow.
    if (winPos !== undefined) {
      [startX, startY] = winPos;
    } else if (focusedWindow) {
      const points = focusedWindow.getPosition();
      const currentScreen = screen.getDisplayNearestPoint({x: points[0], y: points[1]});

      const biggestX = ((points[0] + 100 + width) - currentScreen.bounds.x);
      const biggestY = ((points[1] + 100 + height) - currentScreen.bounds.y);

      if (biggestX > currentScreen.size.width) {
        startX = 50;
      } else {
        startX = points[0] + 34;
      }
      if (biggestY > currentScreen.size.height) {
        startY = 50;
      } else {
        startY = points[1] + 34;
      }
    }

    const hwin = new Window({width, height, x: startX, y: startY}, cfg, fn);
    windowSet.add(hwin);
    hwin.loadURL(url);

    // the window can be closed by the browser process itself
    hwin.on('close', () => {
      hwin.clean();
      windowSet.delete(hwin);
    });

    hwin.on('closed', () => {
      if (process.platform !== 'darwin' && windowSet.size === 0) {
        app.quit();
      }
    });

    return hwin;
  }

  // when opening create a new window
  createWindow();

  // expose to plugins
  app.createWindow = createWindow;

  // mac only. when the dock icon is clicked
  // and we don't have any active windows open,
  // we open one
  app.on('activate', () => {
    if (!windowSet.size) {
      createWindow();
    }
  });

  const makeMenu = () => {
    const menu = plugins.decorateMenu(
      AppMenu(createWindow, () => {
        plugins.updatePlugins({force: true});
      },
      plugins.getLoadedPluginVersions
    ));

    // If we're on Mac make a Dock Menu
    if (process.platform === 'darwin') {
      const dockMenu = Menu.buildFromTemplate([{
        label: 'New Window',
        click() {
          createWindow();
        }
      }]);
      app.dock.setMenu(dockMenu);
    }

    Menu.setApplicationMenu(
      Menu.buildFromTemplate(menu)
    );
  };

  const load = () => {
    plugins.onApp(app);
    plugins.extendKeymaps();
    makeMenu();
  };

  load();
  plugins.subscribe(load);
}).catch(err => {
  console.error('Error while loading devtools extensions', err);
}));

app.on('open-file', (event, path) => {
  const lastWindow = app.getLastFocusedWindow();
  const callback = win => win.rpc.emit('open file', {path});
  if (lastWindow) {
    callback(lastWindow);
  } else if (!lastWindow && {}.hasOwnProperty.call(app, 'createWindow')) {
    app.createWindow(callback);
  } else {
    // If createWindow doesn't exist yet ('ready' event was not fired),
    // sets his callback to an app.windowCallback property.
    app.windowCallback = callback;
  }
});

function installDevExtensions(isDev) {
  if (!isDev) {
    return Promise.resolve();
  }
  // eslint-disable-next-line import/no-extraneous-dependencies
  const installer = require('electron-devtools-installer');

  const extensions = [
    'REACT_DEVELOPER_TOOLS',
    'REDUX_DEVTOOLS'
  ];
  const forceDownload = Boolean(process.env.UPGRADE_EXTENSIONS);

  return Promise.all(extensions.map(name => installer.default(installer[name], forceDownload)));
}