#! /usr/bin/env node
const webpack = require('webpack')
const chokidar = require('chokidar')
const nodemon = require('nodemon')
const paths = require('../config/paths')
const once = require('ramda').once
const defaultConfig = require('../config/webpack.config')
const path = require('path')

const customConfig = require(path.resolve('backpack.config.js')) || {}
const options = {
  env: 'development',
  paths: Object.assign({}, paths, customConfig.paths || {})
}

let serverConfig
if (customConfig.webpack) {
  serverConfig = customConfig.webpack(defaultConfig(options), { env: 'development' })
} else {
  console.log('no custom config file found')
  serverConfig = defaultConfig(options)
}

process.on('SIGINT', process.exit)

let serverCompiler

const startServer = () => {
  const serverPaths = Object
    .keys(serverCompiler.options.entry)
    .map(entry => path.join(serverCompiler.options.output.path, `${entry}.js`))
  const mainPath = path.join(serverCompiler.options.output.path, 'main.js')
  nodemon({ script: mainPath, watch: serverPaths, flags: [] })
    .on('quit', process.exit)
}

const compileServer = () => serverCompiler.run(() => undefined)

const startServerOnce = once(() => startServer())

const watcher = chokidar.watch([options.paths.serverSrcPath])

watcher.on('ready', () => {
  watcher
    .on('add', compileServer)
    .on('addDir', compileServer)
    .on('change', compileServer)
    .on('unlink', compileServer)
    .on('unlinkDir', compileServer)
})

serverCompiler = webpack(serverConfig, (err, stats) => {
  if (err) return
  startServerOnce()
})