import chokidar from 'chokidar';
import fs from 'fs';
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(path) {

  var jsFolder = path;
  jsFolder = jsFolder.split("/")[3];
  const outfile = `/www/js/${jsFolder}.js`

  const filename = path.split("/").slice(-1).toString()
  const entryPoint = path.replace(filename, 'index.js') 

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

  await esbuild.build({
    entryPoints: [entryPoint],
    bundle: true,
    outfile,
    format: 'esm',
    sourcemap: true,
    target: ['es2022'],
    logLevel: 'info'
  });

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

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

  const folders = fs
    .readdirSync('/app/js', { withFileTypes: true })
    .filter(entry => entry.isDirectory())
    .map(entry => entry.name);

  for (const folder of folders) {
    const entryPoint = `/app/js/${folder}/index.js`;
    if (!fs.existsSync(entryPoint)) {
      continue;
    }
    await buildJavascript(`/app/js/${folder}/index.js`);
  }

  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 {
      await buildJavascript(filePath);
    } 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();