require('./check-versions')()
var config = require('../config')
if (!process.env.NODE_ENV) process.env.NODE_ENV = config.dev.env
var path = require('path')
var express = require('express')
var webpack = require('webpack')
var opn = require('opn')
var proxyMiddleware = require('http-proxy-middleware')
var webpackConfig = process.env.NODE_ENV === 'testing'
  ? require('./webpack.prod.conf')
  : require('./webpack.dev.conf')

var updateEmoji = require('./update-emoji').updateEmoji
updateEmoji()

// default port where dev server listens for incoming traffic
var port = process.env.PORT || config.dev.port
// Define HTTP proxies to your custom API backend
// https://github.com/chimurai/http-proxy-middleware
var proxyTable = config.dev.proxyTable

var app = express()
var compiler = webpack(webpackConfig)

var devMiddleware = require('webpack-dev-middleware')(compiler, {
  publicPath: webpackConfig.output.publicPath,
  writeToDisk: true,
  stats: {
    colors: true,
    chunks: false
  }
})

var hotMiddleware = require('webpack-hot-middleware')(compiler)

// FIXME: The statement below gives error about hooks being required in webpack 5.
// force page reload when html-webpack-plugin template changes
// compiler.plugin('compilation', function (compilation) {
//   compilation.plugin('html-webpack-plugin-after-emit', function (data, cb) {
//     // FIXME: This supposed to reload whole page when index.html is changed,
//     // however now it reloads entire page on every breath, i suppose the order
//     // of plugins changed or something. It's a minor thing and douesn't hurt
//     // disabling it, constant reloads hurt much more

//     // hotMiddleware.publish({ action: 'reload' })
//     // cb()
//   })
// })

// proxy api requests
Object.keys(proxyTable).forEach(function (context) {
  var options = proxyTable[context]
  if (typeof options === 'string') {
    options = { target: options }
  }
  app.use(proxyMiddleware.createProxyMiddleware(context, options))
})

// handle fallback for HTML5 history API
app.use(require('connect-history-api-fallback')())

// serve webpack bundle output
app.use(devMiddleware)

// enable hot-reload and state-preserving
// compilation error display
app.use(hotMiddleware)

// serve pure static assets
var staticPath = path.posix.join(config.dev.assetsPublicPath, config.dev.assetsSubDirectory)
app.use(staticPath, express.static('./static'))

module.exports = app.listen(port, function (err) {
  if (err) {
    console.log(err)
    return
  }
  var uri = 'http://localhost:' + port
  console.log('Listening at ' + uri + '\n')
  // opn(uri)
})