'use strict';

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => {
	throw err;
});

process.env.NODE_ENV = 'development';

// Ensure environment variables are read.
require('../env');

const fs = require('fs');
const chalk = require('chalk');
const webpack = require('webpack');
const WebpackDevServer = require('webpack-dev-server');
const clearConsole = require('react-dev-utils/clearConsole');
const checkRequiredFiles = require('react-dev-utils/checkRequiredFiles');
const {
	choosePort,
	createCompiler,
	prepareProxy,
	prepareUrls,
} = require('react-dev-utils/WebpackDevServerUtils');
const openBrowser = require('react-dev-utils/openBrowser');
const paths = require('../paths');
const config = require('../webpack.config.dev');
const createDevServerConfig = require('../webpackDevServer.config');

const useYarn = fs.existsSync(paths.yarnLockFile);
const isInteractive = process.stdout.isTTY;

// Warn and crash if required files are missing
if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
	process.exit(1);
}

// Tools like Cloud9 rely on this.
const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3001;
const HOST = process.env.HOST || '0.0.0.0';

// We attempt to use the default port but if it is busy, we offer the user to
// run on a different port. `detect()` Promise resolves to the next free port.
choosePort(HOST, DEFAULT_PORT)
	.then(port => {
		if (port == null) {
			// We have not found a port.
			return;
		}
		const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
		const appName = require(paths.appPackageJson).name;
		const urls = prepareUrls(protocol, HOST, port);
		// Create a webpack compiler that is configured with custom messages.
		const compiler = createCompiler(webpack, config, appName, urls, useYarn);
		// Load proxy config
		const proxySetting = require(paths.appPackageJson).proxy;
		const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
		// Serve webpack assets generated by the compiler over a web sever.
		const serverConfig = createDevServerConfig(
			proxyConfig,
			urls.lanUrlForConfig
		);
		const devServer = new WebpackDevServer(compiler, serverConfig);
		// Launch WebpackDevServer.
		devServer.listen(port, HOST, err => {
			if (err) {
				return console.log(err);
			}
			if (isInteractive) {
				clearConsole();
			}
			console.log(chalk.cyan('Starting the development server...\n'));
			openBrowser(urls.localUrlForBrowser);
		});

		['SIGINT', 'SIGTERM'].forEach(function(sig) {
			process.on(sig, function() {
				devServer.close();
				process.exit();
			});
		});
	})
	.catch(err => {
		if (err && err.message) {
			console.log(err.message);
		}
		process.exit(1);
	});
