/**
 * @license AngularJS v1.3.0
 * (c) 2010-2014 Google, Inc. http://angularjs.org
 * License: MIT
 */
(function(window, angular, undefined) {'use strict';

/**
 * @ngdoc module
 * @name ngAria
 * @description
 *
 * The `ngAria` module provides support for adding <abbr title="Accessible Rich Internet Applications">ARIA</abbr>
 * attributes that convey state or semantic information about the application in order to allow assistive technologies
 * to convey appropriate information to persons with disabilities.
 *
 * <div doc-module-components="ngAria"></div>
 *
 * # Usage
 * To enable the addition of the ARIA tags, just require the module into your application and the tags will
 * hook into your ng-show/ng-hide, input, textarea, button, select and ng-required directives and adds the
 * appropriate ARIA attributes.
 *
 * Currently, the following ARIA attributes are implemented:
 *
 * + aria-hidden
 * + aria-checked
 * + aria-disabled
 * + aria-required
 * + aria-invalid
 * + aria-multiline
 * + aria-valuenow
 * + aria-valuemin
 * + aria-valuemax
 * + tabindex
 *
 * You can disable individual ARIA attributes by using the {@link ngAria.$ariaProvider#config config} method.
 */

 /* global -ngAriaModule */
var ngAriaModule = angular.module('ngAria', ['ng']).
                        provider('$aria', $AriaProvider);

/**
 * @ngdoc provider
 * @name $ariaProvider
 *
 * @description
 *
 * Used for configuring ARIA attributes.
 *
 * ## Dependencies
 * Requires the {@link ngAria} module to be installed.
 */
function $AriaProvider() {
  var config = {
    ariaHidden : true,
    ariaChecked: true,
    ariaDisabled: true,
    ariaRequired: true,
    ariaInvalid: true,
    ariaMultiline: true,
    ariaValue: true,
    tabindex: true
  };

  /**
   * @ngdoc method
   * @name $ariaProvider#config
   *
   * @param {object} config object to enable/disable specific ARIA attributes
   *
   *  - **ariaHidden** – `{boolean}` – Enables/disables aria-hidden tags
   *  - **ariaChecked** – `{boolean}` – Enables/disables aria-checked tags
   *  - **ariaDisabled** – `{boolean}` – Enables/disables aria-disabled tags
   *  - **ariaRequired** – `{boolean}` – Enables/disables aria-required tags
   *  - **ariaInvalid** – `{boolean}` – Enables/disables aria-invalid tags
   *  - **ariaMultiline** – `{boolean}` – Enables/disables aria-multiline tags
   *  - **ariaValue** – `{boolean}` – Enables/disables aria-valuemin, aria-valuemax and aria-valuenow tags
   *  - **tabindex** – `{boolean}` – Enables/disables tabindex tags
   *
   * @description
   * Enables/disables various ARIA attributes
   */
  this.config = function(newConfig) {
    config = angular.extend(config, newConfig);
  };

  function camelCase(input) {
    return input.replace(/-./g, function(letter, pos) {
      return letter[1].toUpperCase();
    });
  }


  function watchExpr(attrName, ariaAttr, negate) {
    var ariaCamelName = camelCase(ariaAttr);
    return function(scope, elem, attr) {
      if (config[ariaCamelName] && !attr[ariaCamelName]) {
        scope.$watch(attr[attrName], function(boolVal) {
          if (negate) {
            boolVal = !boolVal;
          }
          elem.attr(ariaAttr, boolVal);
        });
      }
    };
  }

  /**
   * @ngdoc service
   * @name $aria
   *
   * @description
   *
   * Contains helper methods for applying ARIA attributes to HTML
   *
   * ## Dependencies
   * Requires the {@link ngAria} module to be installed.
   */
  this.$get = function() {
    return {
      config: function (key) {
        return config[camelCase(key)];
      },
      $$watchExpr: watchExpr
    };
  };
}

var ngAriaTabindex = ['$aria', function($aria) {
  return function(scope, elem, attr) {
    if ($aria.config('tabindex') && !elem.attr('tabindex')) {
      elem.attr('tabindex', 0);
    }
  };
}];

ngAriaModule.directive('ngShow', ['$aria', function($aria) {
  return $aria.$$watchExpr('ngShow', 'aria-hidden', true);
}])
.directive('ngHide', ['$aria', function($aria) {
  return $aria.$$watchExpr('ngHide', 'aria-hidden', false);
}])
.directive('ngModel', ['$aria', function($aria) {

  function shouldAttachAttr (attr, elem) {
    return $aria.config(attr) && !elem.attr(attr);
  }

  function getShape (attr, elem) {
    var type = attr.type,
        role = attr.role;

    return ((type || role) === 'checkbox' || role === 'menuitemcheckbox') ? 'checkbox' :
           ((type || role) === 'radio'    || role === 'menuitemradio') ? 'radio' :
           (type === 'range'              || role === 'progressbar' || role === 'slider') ? 'range' :
           (type || role) === 'textbox'   || elem[0].nodeName === 'TEXTAREA' ? 'multiline' : '';
  }

  return {
    restrict: 'A',
    require: '?ngModel',
    link: function(scope, elem, attr, ngModel) {
      var shape = getShape(attr, elem);
      var needsTabIndex = shouldAttachAttr('tabindex', elem);

      function ngAriaWatchModelValue() {
        return ngModel.$modelValue;
      }

      function getRadioReaction() {
        if (needsTabIndex) {
          needsTabIndex = false;
          return function ngAriaRadioReaction(newVal) {
            var boolVal = newVal === attr.value;
            elem.attr('aria-checked', boolVal);
            elem.attr('tabindex', 0 - !boolVal);
          };
        } else {
          return function ngAriaRadioReaction(newVal) {
            elem.attr('aria-checked', newVal === attr.value);
          };
        }
      }

      function ngAriaCheckboxReaction(newVal) {
        elem.attr('aria-checked', !!newVal);
      }

      switch (shape) {
        case 'radio':
        case 'checkbox':
          if (shouldAttachAttr('aria-checked', elem)) {
            scope.$watch(ngAriaWatchModelValue, shape === 'radio' ?
                getRadioReaction() : ngAriaCheckboxReaction);
          }
          break;
        case 'range':
          if ($aria.config('ariaValue')) {
            if (attr.min && !elem.attr('aria-valuemin')) {
              elem.attr('aria-valuemin', attr.min);
            }
            if (attr.max && !elem.attr('aria-valuemax')) {
              elem.attr('aria-valuemax', attr.max);
            }
            if (!elem.attr('aria-valuenow')) {
              scope.$watch(ngAriaWatchModelValue, function ngAriaValueNowReaction(newVal) {
                elem.attr('aria-valuenow', newVal);
              });
            }
          }
          break;
        case 'multiline':
          if (shouldAttachAttr('aria-multiline', elem)) {
            elem.attr('aria-multiline', true);
          }
          break;
      }

      if (needsTabIndex) {
        elem.attr('tabindex', 0);
      }

      if (ngModel.$validators.required && shouldAttachAttr('aria-required', elem)) {
        scope.$watch(function ngAriaRequiredWatch() {
          return ngModel.$error.required;
        }, function ngAriaRequiredReaction(newVal) {
          elem.attr('aria-required', !!newVal);
        });
      }

      if (shouldAttachAttr('aria-invalid', elem)) {
        scope.$watch(function ngAriaInvalidWatch() {
          return ngModel.$invalid;
        }, function ngAriaInvalidReaction(newVal) {
          elem.attr('aria-invalid', !!newVal);
        });
      }
    }
  };
}])
.directive('ngDisabled', ['$aria', function($aria) {
  return $aria.$$watchExpr('ngDisabled', 'aria-disabled');
}])
.directive('ngClick', ngAriaTabindex)
.directive('ngDblclick', ngAriaTabindex);


})(window, window.angular);