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define(['jquery', 
  'underscore',
  'balanced',
  'lib/forge/cipher',
  'lib/forge/aes',
  'lib/forge/md5',
  'lib/forge/util'], function ($, _, balanced, _Cipher, _CipherAES, _CipherMD5, _CipherUtil) {

  var forge = {},
      Cipher = _Cipher(forge),
      CipherAES = _CipherAES(forge),
      CipherMD5 = _CipherMD5(forge),
      CipherUtil = _CipherUtil(forge);

  var Propay = function (credential_id, temp_token, payer_id, pmi_url) {
    this.credential_id = credential_id;
    this.payer_id = payer_id;
    this.temp_token = temp_token;
    this.pmi_url = pmi_url;
    var md = CipherMD5.create();
    md.update(this.temp_token);
    this.key = md.digest().toHex();
  };

  _.extend(Propay.prototype, {
    // converts balanced's strings to propay
    getPaymentTypeId : function (card_number) {
      var cardType = balanced.card.cardType(card_number);
      switch (cardType) {
        case 'American Express':
          return 'AMEX';
        case 'Mastercard':
          return 'MasterCard';
        case 'VISA':
          return 'Visa';
        case 'Discover Card':
          return 'Discover';
        default:
          throw "Invalid card type";
      }
    },
    createPaymentMethod : function ($form, responseHandler) {
      var card_number = $form.find('[data-propay="number"]').val(),
          exp_month = $form.find('[data-propay="exp-month"]').val(),
          exp_year = $form.find('[data-propay="exp-year"]').val(),
          cvc = $form.find('[data-propay="cvc"]').val();

      var settings = {
        AuthToken : this.temp_token,
        PayerId : this.payer_id,
        PaymentProcessType : 'CreditCard',
        ProcessMethod : 'None',
        PaymentMethodStorageOption : 'Always',
        PaymentTypeId : this.getPaymentTypeId(card_number),
        CardNumber : card_number,
        ExpMonth : exp_month,
        ExpYear : exp_year,
        CVV : cvc
      }

      var name_value_str = $.param(settings);

      var cipher = Cipher.createCipher('AES-CBC', this.key);
      cipher.start({iv: this.key});
      cipher.update(CipherUtil.createBuffer(name_value_str));
      cipher.finish();

      var encrypted64 = CipherUtil.encode64(cipher.output.bytes());

      $.ajax({
        url : this.pmi_url,
        method : 'POST',
        dataType : 'jsonp',
        data : {
          CID : this.credential_id,
          SettingsCipher : encrypted64
        }
      }).done(function (response) {
        console.log(response);
      });

    },
  });

  return Propay;
});