/* Generic responder that composes a response from
 * the query string of a request.
 *
 * It reserves some special prop names:
 *  - body: get's used as the response body
 *  - statusCode: override the 200 OK response code
 *    (response text is set automatically)
 *
 * Any property names it doesn't know about get converted into
 * HTTP headers.
 *
 * For example:
 *  http://test/resource.sjs?Content-Type=text/html&body=<h1>hello</h1>&Hello=hi
 *
 * Outputs:
 * HTTP/1.1 200 OK
 * Content-Type: text/html
 * Hello: hi
 * <h1>hello</h1>
 */
//global handleRequest
'use strict';
const HTTPStatus = new Map([
  [100, 'Continue'],
  [101, 'Switching Protocol'],
  [200, 'OK'],
  [201, 'Created'],
  [202, 'Accepted'],
  [203, 'Non-Authoritative Information'],
  [204, 'No Content'],
  [205, 'Reset Content'],
  [206, 'Partial Content'],
  [300, 'Multiple Choice'],
  [301, 'Moved Permanently'],
  [302, 'Found'],
  [303, 'See Other'],
  [304, 'Not Modified'],
  [305, 'Use Proxy'],
  [306, 'unused'],
  [307, 'Temporary Redirect'],
  [308, 'Permanent Redirect'],
  [400, 'Bad Request'],
  [401, 'Unauthorized'],
  [402, 'Payment Required'],
  [403, 'Forbidden'],
  [404, 'Not Found'],
  [405, 'Method Not Allowed'],
  [406, 'Not Acceptable'],
  [407, 'Proxy Authentication Required'],
  [408, 'Request Timeout'],
  [409, 'Conflict'],
  [410, 'Gone'],
  [411, 'Length Required'],
  [412, 'Precondition Failed'],
  [413, 'Request Entity Too Large'],
  [414, 'Request-URI Too Long'],
  [415, 'Unsupported Media Type'],
  [416, 'Requested Range Not Satisfiable'],
  [417, 'Expectation Failed'],
  [500, 'Internal Server Error'],
  [501, 'Not Implemented'],
  [502, 'Bad Gateway'],
  [503, 'Service Unavailable'],
  [504, 'Gateway Timeout'],
  [505, 'HTTP Version Not Supported']
]);

function handleRequest(request, response) {
  const queryMap = createQueryMap(request);
  if (queryMap.has('statusCode')) {
    let statusCode = parseInt(queryMap.get('statusCode'));
    let statusText = HTTPStatus.get(statusCode);
    queryMap.delete('statusCode');
    response.setStatusLine('1.1', statusCode, statusText);
  }
  if (queryMap.has('body')) {
    let body = queryMap.get('body') || '';
    queryMap.delete('body');
    response.write(body);
  }
  for (let [key, value] of queryMap) {
    response.setHeader(key, value);
  }

  function createQueryMap(request) {
    const queryMap = new Map();
    request.queryString.split('&')
      //split on first "="
      .map((component) => component.split(/=(.+)?/))
      .forEach(pair => queryMap.set(pair[0], decodeURIComponent(pair[1])));
    return queryMap;
  }
}