const {app, BrowserWindow, shell, Menu} = require('electron');
const {isAbsolute} = require('path');
const {parse: parseUrl} = require('url');
const uuid = require('uuid');
const fileUriToPath = require('file-uri-to-path');
const isDev = require('electron-is-dev');
const AutoUpdater = require('../auto-updater');
const toElectronBackgroundColor = require('../utils/to-electron-background-color');
const {icon, cfgDir} = require('../config/paths');
const createRPC = require('../rpc');
const notify = require('../notify');
const fetchNotifications = require('../notifications');
const Session = require('../session');

module.exports = class Window {
  constructor(options, cfg, fn) {
    const opts = Object.assign({
      minWidth: 370,
      minHeight: 190,
      backgroundColor: toElectronBackgroundColor(cfg.backgroundColor || '#000'),
      titleBarStyle: 'hidden-inset',
      title: 'Hyper.app',
      // we want to go frameless on windows and linux
      frame: process.platform === 'darwin',
      transparent: process.platform === 'darwin',
      icon,
      show: process.env.HYPER_DEBUG || process.env.HYPERTERM_DEBUG || isDev,
      acceptFirstMouse: true
    }, options);
    const window = new BrowserWindow(app.plugins.getDecoratedBrowserOptions(opts));
    const rpc = createRPC(window);
    const sessions = new Map();

    // config changes
    const cfgUnsubscribe = app.config.subscribe(() => {
      const cfg_ = app.plugins.getDecoratedConfig();

      // notify renderer
      window.webContents.send('config change');

      // notify user that shell changes require new sessions
      if (cfg_.shell !== cfg.shell ||
        JSON.stringify(cfg_.shellArgs) !== JSON.stringify(cfg.shellArgs)) {
        notify(
          'Shell configuration changed!',
          'Open a new tab or window to start using the new shell'
        );
      }

      // update background color if necessary
      cfg = cfg_;
    });

    rpc.on('init', () => {
      window.setBackgroundColor(toElectronBackgroundColor(cfg.backgroundColor || '#000'));
      window.show();

      // If no callback is passed to createWindow,
      // a new session will be created by default.
      if (!fn) {
        fn = win => win.rpc.emit('termgroup add req');
      }

      // app.windowCallback is the createWindow callback
      // that can be set before the 'ready' app event
      // and createWindow deifinition. It's executed in place of
      // the callback passed as parameter, and deleted right after.
      (app.windowCallback || fn)(window);
      delete (app.windowCallback);
      fetchNotifications(window);
      // auto updates
      if (!isDev && process.platform !== 'linux') {
        AutoUpdater(window);
      } else {
        console.log('ignoring auto updates during dev');
      }
    });

    rpc.on('new', options => {
      const opts = Object.assign({
        rows: 40,
        cols: 100,
        cwd: process.argv[1] && isAbsolute(process.argv[1]) ? process.argv[1] : cfgDir,
        splitDirection: undefined,
        shell: cfg.shell,
        shellArgs: cfg.shellArgs && Array.from(cfg.shellArgs)
      }, options);

      const initSession = (opts, fn) => {
        fn(uuid.v4(), new Session(opts));
      };

      initSession(opts, (uid, session) => {
        sessions.set(uid, session);
        rpc.emit('session add', {
          rows: opts.rows,
          cols: opts.cols,
          uid,
          splitDirection: opts.splitDirection,
          shell: session.shell,
          pid: session.pty.pid
        });

        session.on('data', data => {
          rpc.emit('session data', uid + data);
        });

        session.on('exit', () => {
          rpc.emit('session exit', {uid});
        });
      });
    });
    rpc.on('exit', ({uid}) => {
      const session = sessions.get(uid);
      if (session) {
        session.exit();
      } else {
        console.log('session not found by', uid);
      }
    });
    rpc.on('unmaximize', () => {
      window.unmaximize();
    });
    rpc.on('maximize', () => {
      window.maximize();
    });
    rpc.on('minimize', () => {
      window.minimize();
    });
    rpc.on('resize', ({uid, cols, rows}) => {
      const session = sessions.get(uid);
      session.resize({cols, rows});
    });
    rpc.on('data', ({uid, data, escaped}) => {
      const session = sessions.get(uid);

      if (escaped) {
        const escapedData = session.shell.endsWith('cmd.exe') ?
        `"${data}"` : // This is how cmd.exe does it
        `'${data.replace(/'/g, `'\\''`)}'`; // Inside a single-quoted string nothing is interpreted

        session.write(escapedData);
      } else {
        session.write(data);
      }
    });
    rpc.on('open external', ({url}) => {
      shell.openExternal(url);
    });
    rpc.on('open hamburger menu', ({x, y}) => {
      Menu.getApplicationMenu().popup(Math.ceil(x), Math.ceil(y));
    });
    // Same deal as above, grabbing the window titlebar when the window
    // is maximized on Windows results in unmaximize, without hitting any
    // app buttons
    for (const ev of ['maximize', 'unmaximize', 'minimize', 'restore']) {
      window.on(ev, () => rpc.emit('windowGeometry change'));
    }
    rpc.win.on('move', () => {
      rpc.emit('move');
    });
    rpc.on('close', () => {
      window.close();
    });
    const deleteSessions = () => {
      sessions.forEach((session, key) => {
        session.removeAllListeners();
        session.destroy();
        sessions.delete(key);
      });
    };
    // we reset the rpc channel only upon
    // subsequent refreshes (ie: F5)
    let i = 0;
    window.webContents.on('did-navigate', () => {
      if (i++) {
        deleteSessions();
      }
    });

    // If file is dropped onto the terminal window, navigate event is prevented
    // and his path is added to active session.
    window.webContents.on('will-navigate', (event, url) => {
      const protocol = typeof url === 'string' && parseUrl(url).protocol;
      if (protocol === 'file:') {
        event.preventDefault();

        const path = fileUriToPath(url);

        rpc.emit('session data send', {data: path, escaped: true});
      } else if (protocol === 'http:' || protocol === 'https:') {
        event.preventDefault();
        rpc.emit('session data send', {data: url});
      }
    });

    // expose internals to extension authors
    window.rpc = rpc;
    window.sessions = sessions;

    const load = () => {
      app.plugins.onWindow(window);
    };

    // load plugins
    load();

    const pluginsUnsubscribe = app.plugins.subscribe(err => {
      if (!err) {
        load();
        window.webContents.send('plugins change');
      }
    });

    // Keep track of focus time of every window, to figure out
    // which one of the existing window is the last focused.
    // Works nicely even if a window is closed and removed.
    const updateFocusTime = () => {
      window.focusTime = process.uptime();
    };

    window.on('focus', () => {
      updateFocusTime();
    });

    // the window can be closed by the browser process itself
    window.clean = () => {
      app.config.winRecord(window);
      rpc.destroy();
      deleteSessions();
      cfgUnsubscribe();
      pluginsUnsubscribe();
    };
    // Ensure focusTime is set on window open. The focus event doesn't
    // fire from the dock (see bug #583)
    updateFocusTime();

    return window;
  }
};
