define([
  'summernote/base/core/agent'
], function (agent) {
  return function (chai) {
    chai.dom = chai.dom || {};

    chai.dom.equalsIgnoreCase = function (str1, str2) {
      str1 = str1.toUpperCase();
      str2 = str2.toUpperCase();

      // [workaround] IE8-10 use &nbsp; instead of bogus br
      if (agent.isMSIE && agent.browserVersion < 11) {
        str2 = str2.replace(/<BR>/g, '&NBSP;');
      }

      // [workaround] IE8 str1 markup has newline between tags
      if (agent.isMSIE && agent.browserVersion < 9) {
        str1 = str1.replace(/\r\n/g, '');
      }

      return str1 === str2;
    };

    chai.dom.equalsStyle = function ($node, expected, style) {
      var $tester = $('<div />').css(style, expected);
      return $node.css(style) === $tester.css(style);
    };

    chai.Assertion.addChainableMethod('equalsIgnoreCase', function (expected) {
      var actual = this._obj;

      return this.assert(
        chai.dom.equalsIgnoreCase(actual, expected),
        'expected ' + this._obj + ' to equal ' + expected + ' ignoring case',
        'expected ' + this._obj + ' not to equal ' + expected + ' ignoring case'
      );
    });

    chai.Assertion.addChainableMethod('equalsStyle', function (expected, style) {
      var $node = this._obj;

      return this.assert(
        chai.dom.equalsStyle($node, expected, style),
        'expected ' + this._obj + ' to equal ' + expected + ' style',
        'expected ' + this._obj + ' not to equal ' + expected + ' style'
      );
    });

    chai.assert.equalsIgnoreCase = function (val, exp, msg) {
      new chai.Assertion(val, msg).to.be.equalsIgnoreCase(exp);
    };

    chai.assert.notequalsIgnoreCase = function (val, exp, msg) {
      new chai.Assertion(val, msg).to.not.be.equalsIgnoreCase(exp);
    };
  };
});
