// Copyright 2011 Mark Cavage, Inc.  All rights reserved.

var assert = require('assert');
var util = require('util');

var asn1 = require('asn1');

var Protocol = require('../protocol');



///--- Globals

var Ber = asn1.Ber;



///--- API

function Control(options) {
  if (options) {
    if (typeof (options) !== 'object')
      throw new TypeError('options must be an object');
    if (options.type && typeof (options.type) !== 'string')
      throw new TypeError('options.type must be a string');
    if (options.criticality !== undefined &&
        typeof (options.criticality) !== 'boolean')
      throw new TypeError('options.criticality must be a boolean');
    if (options.value && !Buffer.isBuffer(options.value))
      throw new TypeError('options.value must be a Buffer');
  } else {
    options = {};
  }

  this.type = options.type || '';
  this.criticality = options.critical || options.criticality || false;
  this.value = options.value || null;

  var self = this;
  this.__defineGetter__('json', function () {
    var obj = {
      controlType: self.type,
      criticality: self.criticality,
      controlValue: self.value
    };
    return (typeof (self._json) === 'function' ? self._json(obj) : obj);
  });
}
module.exports = Control;


Control.prototype.toBer = function (ber) {
  assert.ok(ber);

  ber.startSequence();
  ber.writeString(this.type || '');
  ber.writeBoolean(this.criticality);
  if (typeof (this._toBer) === 'function') {
    this._toBer(ber);
  } else {
    if (this.value)
      ber.writeString(this.value);
  }

  ber.endSequence();
  return;
};


Control.prototype.toString = function () {
  return this.json;
};