require('./check-versions')();

const config = require('../config');

if (!process.env.NODE_ENV) 


const opn = require('opn');
const path = require('path');
const express = require('express');
const webpack = require('webpack');
const proxyMiddleware = require('http-proxy-middleware');
const webpackConfig = process.env.NODE_ENV === 'testing'
    ? 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;

// automatically open browser, if not set will be false
const autoOpenBrowser = !!config.dev.autoOpenBrowser;

// 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,
    quiet: true,
});

const hotMiddleware = require('webpack-hot-middleware')(compiler, {
    log: () => {},
});

// 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('./static'));

const uri = `http://localhost:${port}`;

/* eslint no-underscore-dangle: "off" */
let _resolve;
const readyPromise = new Promise((resolve) => {
    _resolve = resolve;
});

console.log('> Starting dev server...');
devMiddleware.waitUntilValid(() => {
    console.log(`> Listening at ${uri}\n`);
    // when env is testing, don't need open it
    if (autoOpenBrowser && process.env.NODE_ENV !== 'testing') {
        opn(uri);
    }
    _resolve();
});

const server = app.listen(port);

module.exports = {
    ready: readyPromise,
    close: () => {
        server.close();
    },
};


{
    process.env.NODE_ENV = JSON.stringify(config.dev.env.NODE_ENV);
}