import vscode from 'vscode';
import fs from 'fs';
import path from 'path';
import os from 'os';
import QuickAccessTreeProvider from './views/quick-access-tree';
import SIHome from './home';
import * as utils from './utils';

const {NodeSSH} = require('node-ssh')

class SuperIDEExtension {
  constructor() {
    this.siHome = undefined;
    this.context = undefined;
    this.subscriptions = [];
  }

  async activate(context) {
    this.context = context;
    this.siHome = new SIHome(context);

    this.subscriptions.push(
      vscode.window.registerTreeDataProvider(
        'superide.quickAccess',
        new QuickAccessTreeProvider()
      )
    );

    this.registerGlobalCommands();

    this.startSuperIDEHome();
  }

  async startSuperIDEHome() {
    vscode.commands.executeCommand('superide.showHome');
  }

  // TODO: finish firstConnect (automatically)
  async connectRemoteContainer() {
    const host = 'mengning.com.cn';
    const username = 'linux';
    const password = 'a7%Xs&&TXG';
    const port = 31874;

    console.log('Connecting to remote container...');
    // detect if local ssh config has the host registered
    // TODO: use remote.SSH.configFile
    const sshConfigPath = path.join(os.homedir(), '.ssh', 'config');
    if (fs.existsSync(sshConfigPath)) {
      const config = fs.readFileSync(sshConfigPath, 'utf8');
      // TODO: more robust regex
      if (config.includes(host)) {
        console.log('Host already registered in local ssh config');
        // TODO: connect the specified folder
      } else {
        // the host has not been registered in the local ssh config

        // connect the host and add the public key to the remote authorized_keys
        const defaultPublicKeyPath = path.join(os.homedir(), '.ssh', 'id_rsa.pub');
        // TODO: if there is no public key, generate one
        const publicKey = fs.readFileSync(defaultPublicKeyPath, 'utf8');

        await this.firstConnect(
          host,
          username,
          password,
          port,
          publicKey
        )

        // append the host to the local ssh config file 
        const sshConfigContent = 
        `\n
        Host ${host}
          HostName ${host}
          Port ${port}
          User ${username}
          PreferredAuthentications publickey
          IdentityFile ~/.ssh/id_rsa
          `;
        // append the host to the local ssh config file
        fs.writeFileSync(sshConfigPath, sshConfigContent, { encoding: 'utf8',  flag: 'a' });
        console.log('Host registered in local ssh config');

        // connect the host with remote-ssh extension
        await vscode.commands.executeCommand('opensshremotes.openEmptyWindowInCurrentWindow', host)
          .then(() => {
            console.log('Connected to host');
          })
          .catch((error) => {
            console.error('Error connecting to host: ', error);
          });
      }
    }
  }

  async firstConnect(host, username, password, port, publicKey) {
    const ssh = new NodeSSH();
    ssh.connect({
    	host: host,
    	username: username,
    	password: password,
    	port: port
    }).then(() => {
    	console.log('Connected successfully');
    	ssh.execCommand(`mkdir -p ~/.ssh && 
    					echo '${publicKey}' >> ~/.ssh/authorized_keys`, )
    		.then(result => {
    			if (result.stdout) console.log('STDOUT: ' + result.stdout);
    			if (result.stderr) console.log('STDERR: ' + result.stderr);
    		});
    }).catch(error => {
    	console.log('Error: ', error);
    });
  }

  registerGlobalCommands() {
    this.subscriptions.push(
      vscode.commands.registerCommand('superide.showHome', (url) =>
        this.siHome.toggle(url)
      ),
      vscode.commands.registerCommand('superide.connectRemoteContainer', () =>
        this.connectRemoteContainer() 
      )
    );
  }

  disposeSubscriptions() {
    utils.disposeSubscriptions(this.subscriptions);
  }

  deactivate() {
    this.disposeSubscriptions();
  }
}

export const extension = new SuperIDEExtension();

export function activate(context) {
  extension.activate(context);
  return extension;
}

export function deactivate() {
  extension.deactivate();
}