/**
 * AngularUI - The companion suite for AngularJS
 * @version v0.2.1 - 2012-09-19
 * @link http://angular-ui.github.com
 * @license MIT License, http://www.opensource.org/licenses/MIT
 */

// READ: http://docs-next.angularjs.org/guide/ie
(function (exports) {

  var debug = window.ieShivDebug || false;

  var getIE = function () {
    // Returns the version of Internet Explorer or a -1
    // (indicating the use of another browser).
    var rv = -1; // Return value assumes failure.
    if (navigator.appName === 'Microsoft Internet Explorer') {
      var ua = navigator.userAgent;
      var re = new RegExp("MSIE ([0-9]{1,}[\\.0-9]{0,})");
      if (re.exec(ua) !== null) {
        rv = parseFloat(RegExp.$1);
      }
    }
    return rv;
  };

  var toCustomElements = function (str, delim) {
    var result = [];
    var dashed = str.replace(/([A-Z])/g, function ($1) {
      return " " + $1.toLowerCase();
    });
    var tokens = dashed.split(' ');
    var ns = tokens[0];
    var dirname = tokens.slice(1).join('-');

    // this is finite list and it seemed senseless to create a custom method
    result.push(ns + ":" + dirname);
    result.push(ns + "-" + dirname);
    result.push("x-" + ns + "-" + dirname);
    result.push("data-" + ns + "-" + dirname);
    return result;
  };

  var shiv = function () {
    // TODO: unfortunately, angular is not exposing these in 'ng' module
    var tags = [ 'ngInclude', 'ngPluralize', 'ngView', 'ngSwitch' ]; // angular specific,

    // TODO: unfortunately, angular does not expose module names, it is a simple change to angular's loader.js
    // however, not sure if something happens when referencing them, so maybe an OK thing.

    var moduleNames = window.myAngularModules || []; // allow user to inject their own directives
    moduleNames.push('ui.directives');

    if (debug) console.log('moduleNames', moduleNames);
    function pushDirectives(item) {
      // only allow directives
      if (item[1] === "directive") {
        var dirname = item[2][0];
        tags.push(dirname);
      } else {
        if (debug) console.log("skipping", item[1], item[2][0]);
      }
    }

    for (var k = 0, mlen = moduleNames.length; k < mlen; k++) {
      var modules = angular.module(moduleNames[k]); // will throw runtime exception
      angular.forEach(modules._invokeQueue, pushDirectives);
    }

    if (debug) console.log("tags found", tags);
    for (var i = 0, tlen = tags.length; i < tlen; i++) {
      if (debug) console.log("tag", tags[i]);
      var customElements = toCustomElements(tags[i], ':');
      for (var j = 0, clen = customElements.length; j < clen; j++) {
        var customElement = customElements[j];
        if (debug) console.log("shivving", customElement);
        document.createElement(customElement);
      }
    }
  };

  var ieVersion = getIE();

  if ((ieVersion > -1 && ieVersion < 9) || debug) {
    shiv();
  }

})(window);