/* eslint-disable no-process-env, no-console */

const path = require('path');
const express = require('express');
const webpack = require('webpack');
const config = require('./config');

if (!process.env.NODE_ENV) {
  process.env.NODE_ENV = JSON.parse(config.dev.env.NODE_ENV);
}

const proxyMiddleware = require('http-proxy-middleware');
const webpackConfig = process.env.NODE_ENV === 'test' ?
  require('./webpack.prod.conf') :
  require('./webpack.dev.conf');

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

const app = express();
const compiler = webpack(webpackConfig);

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

const hotMiddleware = require('webpack-hot-middleware')(compiler);
// force page reload when html-webpack-plugin template changes
compiler.plugin('compilation', (compilation) => {
  compilation.plugin('html-webpack-plugin-after-emit', (data, cb) => {
    hotMiddleware.publish({ action: 'reload' });
    cb();
  });
});

// proxy api requests
Object.keys(proxyTable).forEach((context) => {
  let options = proxyTable[context];
  if (typeof options === 'string') {
    options = { target: options };
  }
  app.use(proxyMiddleware(options.filter || 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
const staticPath = path.posix.join(config.dev.assetsPublicPath, config.dev.assetsSubDirectory);
app.use(staticPath, express.static(config.dev.staticAssetsDirectory));

module.exports = app.listen(port, (err) => {
  if (err) {
    console.log(err);
    return;
  }
  console.log(`Listening at http://localhost:${port}\n`);
});