import * as stream from 'stream'
import plugins = require('./gulpbrowser.plugins')
import * as q from 'q'

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