import * as fs from 'fs';
import * as os from 'os';
import logger from '../logger';

class BackendInfo {
  gitCommitHash = '';
  hostname = '';

  constructor() {
    this.setLatestCommitHash();
    this.hostname = os.hostname();
  }

  public getBackendInfo() {
    return {
      'hostname': this.hostname,
      'git-commit': this.gitCommitHash,
    };
  }

  public getShortCommitHash() {
    return this.gitCommitHash.slice(0, 7);
  }

  private setLatestCommitHash(): void {
    try {
      this.gitCommitHash = fs.readFileSync('../.git/refs/heads/master').toString().trim();
    } catch (e) {
      logger.err('Could not load git commit info: ' + e.message || e);
    }
  }
}

export default new BackendInfo();