import chokidar from 'chokidar';
import fse from 'fs-extra';
import esbuild from 'esbuild';

// ====================================================================
// |
// ====================================================================
function log(message) {
  const options = {
    encoding: 'utf-8',
    flag: 'a+',
  };

  const datetime = new Date().toISOString();

  message = `[${datetime}] ${message}\n`;

  fse.outputFileSync(
    '/logs/builder/javascript.log',
    message,
    options
  );

  console.log(message);
}

// ====================================================================
// |
// ====================================================================
async function buildJavascript(name) {

  const entryPoint = `/app/js/${name}/index.js`;
  const outfile = `/www/js/${name}.js`;

  log(`Building ${name}`);
  log(`Entry: ${entryPoint}`);
  log(`Output: ${outfile}`);

  await esbuild.build({
    entryPoints: [entryPoint],

    bundle: true,

    outfile,

    format: 'esm',

    sourcemap: true,

    target: ['es2022'],

    logLevel: 'info'
  });

  log(`Finished ${name}`);
}

// ====================================================================
// |
// ====================================================================
async function compileAll() {

  await buildJavascript('component');
  await buildJavascript('app');

  log('Done');
}

// ====================================================================
// |
// ====================================================================
function startWatcher(watchFolders) {

  const options = {
    awaitWriteFinish: true,
    ignoreInitial: true,
    usePolling: true,
    interval: 100
  };

  const watcher = chokidar.watch(
    watchFolders,
    options
  );

  watcher.on('all', async (event, filePath) => {

    log(`${event}: ${filePath}`);

    try {

      if (filePath.includes('/app/js/component/')) {
        await buildJavascript('component');
      }

      if (filePath.includes('/app/js/app/')) {
        await buildJavascript('app');
      }

    } catch (error) {

      log(`Build failed: ${error.message}`);

    }

  });

  watcher.on(
    'ready',
    () => log('********** Watch is running **********')
  );
}

// ====================================================================
// | MAIN
// ====================================================================
async function go() {

  const watchFolders = [
    '/app/js'
  ];

  if (process.argv[2] === 'compile-and-watch') {

    await compileAll();

    startWatcher(watchFolders);

  } else if (process.argv[2] === 'compile-only') {

    await compileAll();

  } else {

    startWatcher(watchFolders);

  }
}

go();