import * as stream from 'stream';
import plugins = require('./gulpbrowser.plugins');
import * as smartpromise from '@pushrocks/smartpromise';

let browserify = function(transforms = []) {
  if (!Array.isArray(transforms)) {
    transforms = [transforms];
  }

  let forEach = function(file, enc, cb) {
    // do this with every chunk (file in gulp terms)

    let bundleCallback = function(err, bufferedContent) {
      // our bundle callback for when browserify is finished
      if (Buffer.isBuffer(bufferedContent)) {
        file.contents = bufferedContent;
      } else {
        console.log('gulp-browser: .browserify() ' + err.message);
        cb(new Error(err.message), file);
        return;
      }
      cb(null, file);
    };

    if (file.contents.length > 0) {
      let browserified = plugins.browserify(file, { basedir: file.base });

      transforms.forEach(function(transform) {
        if (typeof transform === 'function') {
          browserified.transform(transform);
        } else {
          browserified.transform(transform.transform, transform.options);
        }
      });

      browserified.bundle(bundleCallback);
    } else {
      console.warn('gulp-browser: .browserify() file.contents appears to be empty');
      cb(null, file);
    }
  };

  let atEnd = function(cb) {
    cb();
  }; // no need to clean up after ourselves

  return plugins.through2.obj(forEach, atEnd); // this is the through object that gets returned by gulpBrowser.browserify();
};

export = browserify;