import {CLIOptions} from 'aurelia-cli';
import * as fs from 'fs';
import * as gulp from 'gulp';
import * as rename from 'gulp-rename';
import path from 'path';
import * as through from 'through2';

import * as project from '../aurelia.json';

function configureEnvironment() {
  const env = CLIOptions.getEnvironment();

  return gulp.src(`aurelia_project/environments/${env}${project.transpiler.fileExtension}`)
    .pipe(rename(`environment${project.transpiler.fileExtension}`))
    .pipe(gulp.dest(project.paths.root))
    .pipe(through.obj((file, enc,  cb) => {
      // https://github.com/webpack/watchpack/issues/25#issuecomment-287789288
      const now = Date.now() / 1000;
      const then = now - 10;
      fs.utimes(file.path, then, then, (err) => { if (err) { throw err; } });
      cb(null, file);
    }));
}

export default configureEnvironment;