import * as fs from 'fs';
import * as path from 'path';
import * as os from 'os';
import * as vscode from 'vscode';
const { NodeSSH } = require('node-ssh')
import * as utils from './utils';

export default class RemoteContainer {

  async firstConnect(host: string, username: string, password: string, port: number): Promise<string> {
    return new Promise(async (resolve, reject) => {
      // 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');

      // first connect to the remote host using password
      const ssh = new NodeSSH();
      try {
        await ssh.connect({
          host: host,
          username: username,
          password: password,
          port: port
        });

        // add the public key to the remote authorized_keys
        await ssh.execCommand(`mkdir -p ~/.ssh && echo '${publicKey}' >> ~/.ssh/authorized_keys`);
        console.log('Public key added to remote authorized_keys');
        await ssh.dispose();

        // only connect successfully then save the host info
        // TODO: request change password
        // TODO: use remote.SSH.configFile
        const sshConfigPath = path.join(os.homedir(), '.ssh', 'config');
        // append the host to the local ssh config file 
        const sshConfigContent =
          `\nHost ${host}\n  HostName ${host}\n  Port ${port}\n  User ${username}\n  PreferredAuthentications publickey\n  IdentityFile ~/.ssh/id_rsa\n  `;
        // 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');
        resolve("success");
      } catch (error) {
        console.error('Error adding public key: ', error);
        await ssh.dispose();
        reject("failed");
      }
    });
  }


  openRemoteFolder(host: string, path: string): void {
    const command = `code --remote ssh-remote+${host} ${path} --reuse-window`
    let terminal = vscode.window.activeTerminal || vscode.window.createTerminal(`Ext Terminal`);
    terminal.show(true);
    terminal.sendText(command);
  }

}