const serveAutoIndexPage = require('./serveAutoIndexPage');
const serveHTMLModule = require('./serveHTMLModule');
const serveJavaScriptModule = require('./serveJavaScriptModule');
const serveStaticFile = require('./serveStaticFile');
const serveMetadata = require('./serveMetadata');

/**
 * Send the file, JSON metadata, or HTML directory listing.
 */
function serveFile(req, res) {
  if (req.query.meta != null) {
    return serveMetadata(req, res);
  }

  if (req.entry.type === 'directory') {
    return serveAutoIndexPage(req, res);
  }

  if (req.query.module != null) {
    if (req.entry.contentType === 'application/javascript') {
      return serveJavaScriptModule(req, res);
    }

    if (req.entry.contentType === 'text/html') {
      return serveHTMLModule(req, res);
    }

    return res
      .status(403)
      .type('text')
      .send('?module mode is available only for JavaScript and HTML files');
  }

  serveStaticFile(req, res);
}

module.exports = serveFile;