const fs = require('fs');
const path = require('path');

/**
 * @typedef {Object} options
 * @property {any} [opts] object to pass to the handlers
 * @property {string} [subdir] subdirectory for all requests
 * @property {boolean} [verbose] enable verbose logging
 */

/**
 * Load all request handlers in the given folder
 *
 * @param {any} app express app
 * @param {string} modulefolder folder that contains all modules
 * @param {options} options
 */
module.exports = function (
  app,
  modulefolder,
  options = { opts: undefined, subdir: '', verbose: false }
) {
  const { opts, subdir, verbose } = options;

  for (const f of fs.readdirSync(modulefolder)) {
    const regex = /(.*?)-(.*?)\.js/;
    let [, method, url] = regex.exec(f);
    url = '/' + subdir + '/' + url + '/';
    url = url
      .replace(/^\/[^/]*\/root/i, '/')
      .replace(/\./g, '/')
      .replace(/\/+/g, '/');

    const handler = require(path.join(process.cwd(), modulefolder, f));
    const func = (req, res, next) => {
      handler(req, res, next, opts);
    };

    if (verbose) console.log(`[requestor info] redirecting ${url} to ${f}`);

    switch (method) {
      case 'post':
        app.post(url, func);
        break;
      case 'get':
        app.get(url, func);
        break;
      case 'put':
        app.put(url, func);
        break;
      case 'delete':
        app.delete(url, func);
        break;
      case 'all':
        app.all(url, func);
        break;
      default:
        if (verbose) {
          console.warn(`'${method}' did not match any request method, ignoring`);
        }
        break;
    }
  }
};