/**
 * React Static Boilerplate
 * https://github.com/koistya/react-static-boilerplate
 *
 * Copyright © 2015-2016 Konstantin Tarkus (@koistya)
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE.txt file in the root directory of this source tree.
 */

const path = require('path')
const browserSync = require('browser-sync')
const webpack = require('webpack')
const webpackDevMiddleware = require('webpack-dev-middleware')
const webpackHotMiddleware = require('webpack-hot-middleware')
const task = require('./task')
const webpackConfig = require('../webpack.config')

task('start', () => new Promise(resolve => {
  // Hot Module Replacement (HMR) + React Hot Reload
  if (webpackConfig.debug) {
    webpackConfig.entry.vendor
      .unshift('react-hot-loader/patch', 'webpack-hot-middleware/client')
    webpackConfig.module.loaders
      .find(x => x.loader === 'babel-loader').query.plugins
      .unshift('react-hot-loader/babel')
    webpackConfig.plugins.push(new webpack.HotModuleReplacementPlugin())
    webpackConfig.plugins.push(new webpack.NoErrorsPlugin())
  }

  const bundler = webpack(webpackConfig)

  browserSync({
    port: Number(process.env.PORT || 3000),
    ui: {
      port: Number(process.env.PORT || 3000) + 1,
    },
    server: {
      baseDir: './src',

      middleware: [
        webpackDevMiddleware(bundler, {
          // IMPORTANT: dev middleware can't access webpackConfig, so we should
          // provide publicPath by ourselves
          publicPath: webpackConfig.output.publicPath,

          // pretty colored output
          stats: webpackConfig.stats,

          // for other settings see
          // http://webpack.github.io/docs/webpack-dev-middleware.html
        }),

        // bundler should be the same as above
        webpackHotMiddleware(bundler),

        // Serve index.html for all unknown requests
        (req, res, next) => {
          if (req.headers.accept.startsWith('text/html')) {
            const filename = path.join(bundler.outputPath, 'index.html')
            bundler.outputFileSystem.readFile(filename, (err, result) => {
              if (err) {
                next(err)
                return
              }
              res.setHeader('Content-Type', 'text/html')
              res.end(result)
            })
          }
          next()
        },
      ],
    },

    // no need to watch '*.js' here, webpack will take care of it for us,
    // including full page reloads if HMR won't work
    files: [
      'build/**/*.css',
      'build/**/*.html',
    ],
  })

  resolve()
}))