botserver/packages/core.gbapp/services/GBVMService.ts

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'use strict';

import { GBMinInstance, IGBCoreService } from 'botlib';
import * as fs from 'fs';
import { DialogClass } from './GBAPIService';
import { GBDeployer } from './GBDeployer';
import { TSCompiler } from './TSCompiler';
const util = require('util');
const logger = require('../../../src/logger');
const vm = require('vm');
const UrlJoin = require('url-join');
const vb2ts = require('vbscript-to-typescript/dist/converter');

/**
 * @fileoverview Virtualization services for emulation of BASIC.
 */

export class GBVMService implements IGBCoreService {
  private script = new vm.Script();

  public async loadJS(
    filename: string,
    min: GBMinInstance,
    core: IGBCoreService,
    deployer: GBDeployer,
    localPath: string
  ): Promise<void> {
    const path = 'packages/default.gbdialog';
    const file = 'bot.vbs';
    const source = UrlJoin(path, file);

    // Example when handled through fs.watch() listener
    fs.watchFile(source, async (curr, prev) => {
      await this.run(source, path, localPath, min, deployer, filename);
    });
    await this.run(source, path, localPath, min, deployer, filename);
  }

  private async run(source: any, path: string, localPath: string, min: any, deployer: GBDeployer, filename: string) {
    // Converts VBS into TS.

    vb2ts.convertFile(source);

    // Convert TS into JS.
    const tsfile = `bot.ts`;
    const tsc = new TSCompiler();
    // TODO: tsc.compile([UrlJoin(path, tsfile)]);
    // Run JS into the GB context.
    const jsfile = `bot.js`;
    localPath = UrlJoin(path, jsfile);
    if (fs.existsSync(localPath)) {
      let code: string = fs.readFileSync(localPath, 'utf8');
      code = code.replace(/^.*exports.*$/gm, '');
      code = code.replace(/this\./gm, 'await this.');
      code = code.replace(/function/gm, 'async function');
      const sandbox: DialogClass = new DialogClass(min);
      const context = vm.createContext(sandbox);
      vm.runInContext(code, context);
      min.sandbox = sandbox;
      await deployer.deployScriptToStorage(min.instanceId, filename);
      logger.info(`[GBVMService] Finished loading of ${filename}`);
    }
  }
}