/* global Twilio */

/**
 * The TwiMLResponse is the must return value on your CustomFn when you should return a Twilio TwiML.
 *
 * @class
 *
 * @extends { external:"Twilio.Response" }
 */
class TwiMLResponse extends Twilio.Response {
  /**
   * @param {(string|object)} body You can pass a string or a VoiceResponse object
   * @param {number} statusCode
   * @returns {TwiMLResponse}
   */
  constructor(body = '<?xml version="1.0" encoding="UTF-8"?><Response />', statusCode = 200) {
    super({ statusCode, body });

    this.appendHeader('Access-Control-Allow-Origin', '*');
    this.appendHeader('Access-Control-Allow-Methods', 'OPTIONS, POST');
    this.appendHeader('Access-Control-Allow-Headers', 'Content-Type');
    this.appendHeader('Content-Type', 'application/xml');

    if (typeof body !== 'string') {
      const stringBody = body.toString();

      if (!stringBody.includes('<?xml version="1.0" encoding="UTF-8"?>')) {
        this.setBody('<?xml version="1.0" encoding="UTF-8"?><Response />');
        this.setStatusCode(200);
        return this;
      }

      this.setBody(stringBody);
    }

    return this;
  }

  [Symbol.toStringTag] = this.constructor.name;
}

module.exports = { TwiMLResponse };