'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('../config/env');

const path = require('path');
const fs = require('fs-extra');
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('../config/paths');
const config = require('../config/webpack.config.flask');
const createDevServerConfig = require('../config/webpackDevServer.config');

const child_process = require('child_process');

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);
}

const formatWebpackMessages = require('react-dev-utils/formatWebpackMessages');
const printHostingInstructions = require('react-dev-utils/printHostingInstructions');
const FileSizeReporter = require('react-dev-utils/FileSizeReporter');

const measureFileSizesBeforeBuild = FileSizeReporter.measureFileSizesBeforeBuild;
const printFileSizesAfterBuild = FileSizeReporter.printFileSizesAfterBuild;

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

// First, read the current file sizes in build directory.
// This lets us display how much they changed later.
measureFileSizesBeforeBuild(paths.appBuild)
  .then(previousFileSizes => {
    // Remove all content but keep the directory so that
    // if you're in it, you don't end up in Trash
    fs.emptyDirSync(paths.appBuild);
    // Merge with the public folder
    copyPublicFolder();
    // Start the webpack build
    return build(previousFileSizes);
  })
  .then(
    ({ stats, previousFileSizes, warnings }) => {
      if (warnings.length) {
        console.log(chalk.yellow('Compiled with warnings.\n'));
        console.log(warnings.join('\n\n'));
        console.log(
          '\nSearch for the ' +
            chalk.underline(chalk.yellow('keywords')) +
            ' to learn more about each warning.'
        );
        console.log(
          'To ignore, add ' +
            chalk.cyan('// eslint-disable-next-line') +
            ' to the line before.\n'
        );
      } else {
        console.log(chalk.green('Compiled successfully.\n'));
      }

      console.log('File sizes after gzip:\n');
      printFileSizesAfterBuild(stats, previousFileSizes);
      console.log();
      child_process.spawn('python',['walle-server.py'],{
        stdio:'inherit'
      });
      const appPackage = require(paths.appPackageJson);
      const publicUrl = paths.publicUrl;
      const publicPath = config.output.publicPath;
      const buildFolder = path.relative(process.cwd(), paths.appBuild);
      printHostingInstructions(
        appPackage,
        publicUrl,
        publicPath,
        buildFolder,
        useYarn
      );
    },
    err => {
      console.log(chalk.red('Failed to compile.\n'));
      console.log((err.message || err) + '\n');
      process.exit(1);
    }
  );

// Create the production build and print the deployment instructions.
function build(previousFileSizes) {
  console.log('Creating an optimized production build...');

  let compiler = webpack(config);
  return new Promise((resolve, reject) => {
    // compiler.run((err, stats) => {
    compiler.watch({ // watch options:
        aggregateTimeout: 300, // wait so long for more changes
        poll: true // use polling instead of native watchers
        // pass a number to set the polling interval
    },(err, stats) => {
      if (err) {
        return reject(err);
      }
      const messages = formatWebpackMessages(stats.toJson({}, true));
      if (messages.errors.length) {
        return reject(new Error(messages.errors.join('\n\n')));
      }
      if (process.env.CI && messages.warnings.length) {
        console.log(
          chalk.yellow(
            '\nTreating warnings as errors because process.env.CI = true.\n' +
              'Most CI servers set it automatically.\n'
          )
        );
        return reject(new Error(messages.warnings.join('\n\n')));
      }
      return resolve({
        stats,
        previousFileSizes,
        warnings: messages.warnings,
      });
    });
  });
}

function copyPublicFolder() {
  fs.copySync(paths.appPublic, paths.appBuild, {
    dereference: true,
    filter: file => file !== paths.appHtml,
  });
}

// Tools like Cloud9 rely on this.

// function startWebPackDevServer(){
//   const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
//   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);
//       devServer.listen(port, HOST, err => {
//         if (err) {
//           return console.log(err);
//         }
//         if (isInteractive) {
//           clearConsole();
//         }
//         child_process.exec('python',['walle-server.py'],{
//           stdio:'inherit'
//         });
//       });
//       // openBrowser(urls.localUrlForBrowser);
//     })
//     .catch(err => {
//       if (err && err.message) {
//         console.log(err.message);
//       }
//       process.exit(1);
//     });
// }