import express from 'express';
import path from 'path';
import { readdir } from 'node:fs/promises';

import { config } from './config';

const app = express();

async function loadPages(): Promise<void> {
  try {
    const pagesPath = path.join(__dirname, './pages');
    const pagesFiles = path.basename(__filename).endsWith('.ts')
                     ? (await readdir(pagesPath)).filter(file => file.endsWith('.ts'))
                     : (await readdir(pagesPath)).filter(file => file.endsWith('.js'));
    for (const file of pagesFiles) {
      const filePath = path.join(pagesPath, file);
      const data = await import(filePath);
      if (data.page !== undefined)
        app.get(data.page.path, data.page.handleRequest);
      else
        console.error(`The page at ${filePath} is missing required properties.`);
    }
  } catch(err: unknown) { throw err; }
}

async function init() {
  try {
    await loadPages();
    app.listen(config.port, () => {
      console.log(`api server up, listen on ${config.port}`);
    });
  } catch(err: unknown) { throw err; }
}

try { init(); } catch(err: unknown) {
  if (err instanceof Error)
    console.error(`Error, ${err.message}`);
  console.error(`Error, ${String(err)}`);
}