'use strict';

/**
 * @ngdoc directive
 * @name angular.module.ng.$compileProvider.directive.ng-href
 * @restrict A
 *
 * @description
 * Using <angular/> markup like {{hash}} in an href attribute makes
 * the page open to a wrong URL, if the user clicks that link before
 * angular has a chance to replace the {{hash}} with actual URL, the
 * link will be broken and will most likely return a 404 error.
 * The `ng-href` solves this problem by placing the `href` in the
 * `ng-` namespace.
 *
 * The buggy way to write it:
 * <pre>
 * <a href="http://www.gravatar.com/avatar/{{hash}}"/>
 * </pre>
 *
 * The correct way to write it:
 * <pre>
 * <a ng-href="http://www.gravatar.com/avatar/{{hash}}"/>
 * </pre>
 *
 * @element A
 * @param {template} ng-href any string which can contain `{{}}` markup.
 *
 * @example
 * This example uses `link` variable inside `href` attribute:
    <doc:example>
      <doc:source>
        <input ng-model="value" /><br />
        <a id="link-1" href ng-click="value = 1">link 1</a> (link, don't reload)<br />
        <a id="link-2" href="" ng-click="value = 2">link 2</a> (link, don't reload)<br />
        <a id="link-3" ng-href="/{{'123'}}" ng-ext-link>link 3</a> (link, reload!)<br />
        <a id="link-4" href="" name="xx" ng-click="value = 4">anchor</a> (link, don't reload)<br />
        <a id="link-5" name="xxx" ng-click="value = 5">anchor</a> (no link)<br />
        <a id="link-6" ng-href="/{{value}}" ng-ext-link>link</a> (link, change hash)
      </doc:source>
      <doc:scenario>
        it('should execute ng-click but not reload when href without value', function() {
          element('#link-1').click();
          expect(input('value').val()).toEqual('1');
          expect(element('#link-1').attr('href')).toBe("");
        });

        it('should execute ng-click but not reload when href empty string', function() {
          element('#link-2').click();
          expect(input('value').val()).toEqual('2');
          expect(element('#link-2').attr('href')).toBe("");
        });

        it('should execute ng-click and change url when ng-href specified', function() {
          expect(element('#link-3').attr('href')).toBe("/123");

          element('#link-3').click();
          expect(browser().window().path()).toEqual('/123');
        });

        it('should execute ng-click but not reload when href empty string and name specified', function() {
          element('#link-4').click();
          expect(input('value').val()).toEqual('4');
          expect(element('#link-4').attr('href')).toBe("");
        });

        it('should execute ng-click but not reload when no href but name specified', function() {
          element('#link-5').click();
          expect(input('value').val()).toEqual('5');
          expect(element('#link-5').attr('href')).toBe("");
        });

        it('should only change url when only ng-href', function() {
          input('value').enter('6');
          expect(element('#link-6').attr('href')).toBe("/6");

          element('#link-6').click();
          expect(browser().window().path()).toEqual('/6');
        });
      </doc:scenario>
    </doc:example>
 */

/**
 * @ngdoc directive
 * @name angular.module.ng.$compileProvider.directive.ng-src
 * @restrict A
 *
 * @description
 * Using <angular/> markup like `{{hash}}` in a `src` attribute doesn't
 * work right: The browser will fetch from the URL with the literal
 * text `{{hash}}` until <angular/> replaces the expression inside
 * `{{hash}}`. The `ng-src` attribute solves this problem by placing
 *  the `src` attribute in the `ng-` namespace.
 *
 * The buggy way to write it:
 * <pre>
 * <img src="http://www.gravatar.com/avatar/{{hash}}"/>
 * </pre>
 *
 * The correct way to write it:
 * <pre>
 * <img ng-src="http://www.gravatar.com/avatar/{{hash}}"/>
 * </pre>
 *
 * @element IMG
 * @param {template} ng-src any string which can contain `{{}}` markup.
 */

/**
 * @ngdoc directive
 * @name angular.module.ng.$compileProvider.directive.ng-disabled
 * @restrict A
 *
 * @description
 *
 * The following markup will make the button enabled on Chrome/Firefox but not on IE8 and older IEs:
 * <pre>
 * <div ng-init="scope = { isDisabled: false }">
 *  <button disabled="{{scope.isDisabled}}">Disabled</button>
 * </div>
 * </pre>
 *
 * The HTML specs do not require browsers to preserve the special attributes such as disabled.
 * (The presence of them means true and absence means false)
 * This prevents the angular compiler from correctly retrieving the binding expression.
 * To solve this problem, we introduce ng-disabled.
 *
 * @example
    <doc:example>
      <doc:source>
        Click me to toggle: <input type="checkbox" ng-model="checked"><br/>
        <button ng-model="button" ng-disabled="checked">Button</button>
      </doc:source>
      <doc:scenario>
        it('should toggle button', function() {
          expect(element('.doc-example-live :button').prop('disabled')).toBeFalsy();
          input('checked').check();
          expect(element('.doc-example-live :button').prop('disabled')).toBeTruthy();
        });
      </doc:scenario>
    </doc:example>
 *
 * @element INPUT
 * @param {string} expression Angular expression that will be evaluated.
 */


/**
 * @ngdoc directive
 * @name angular.module.ng.$compileProvider.directive.ng-checked
 * @restrict A
 *
 * @description
 * The HTML specs do not require browsers to preserve the special attributes such as checked.
 * (The presence of them means true and absence means false)
 * This prevents the angular compiler from correctly retrieving the binding expression.
 * To solve this problem, we introduce ng-checked.
 * @example
    <doc:example>
      <doc:source>
        Check me to check both: <input type="checkbox" ng-model="master"><br/>
        <input id="checkSlave" type="checkbox" ng-checked="master">
      </doc:source>
      <doc:scenario>
        it('should check both checkBoxes', function() {
          expect(element('.doc-example-live #checkSlave').prop('checked')).toBeFalsy();
          input('master').check();
          expect(element('.doc-example-live #checkSlave').prop('checked')).toBeTruthy();
        });
      </doc:scenario>
    </doc:example>
 *
 * @element INPUT
 * @param {string} expression Angular expression that will be evaluated.
 */


/**
 * @ngdoc directive
 * @name angular.module.ng.$compileProvider.directive.ng-multiple
 * @restrict A
 *
 * @description
 * The HTML specs do not require browsers to preserve the special attributes such as multiple.
 * (The presence of them means true and absence means false)
 * This prevents the angular compiler from correctly retrieving the binding expression.
 * To solve this problem, we introduce ng-multiple.
 *
 * @example
     <doc:example>
       <doc:source>
         Check me check multiple: <input type="checkbox" ng-model="checked"><br/>
         <select id="select" ng-multiple="checked">
           <option>Misko</option>
           <option>Igor</option>
           <option>Vojta</option>
           <option>Di</option>
         </select>
       </doc:source>
       <doc:scenario>
         it('should toggle multiple', function() {
           expect(element('.doc-example-live #select').prop('multiple')).toBeFalsy();
           input('checked').check();
           expect(element('.doc-example-live #select').prop('multiple')).toBeTruthy();
         });
       </doc:scenario>
     </doc:example>
 *
 * @element SELECT
 * @param {string} expression Angular expression that will be evaluated.
 */


/**
 * @ngdoc directive
 * @name angular.module.ng.$compileProvider.directive.ng-readonly
 * @restrict A
 *
 * @description
 * The HTML specs do not require browsers to preserve the special attributes such as readonly.
 * (The presence of them means true and absence means false)
 * This prevents the angular compiler from correctly retrieving the binding expression.
 * To solve this problem, we introduce ng-readonly.
 * @example
    <doc:example>
      <doc:source>
        Check me to make text readonly: <input type="checkbox" ng-model="checked"><br/>
        <input type="text" ng-readonly="checked" value="I'm Angular"/>
      </doc:source>
      <doc:scenario>
        it('should toggle readonly attr', function() {
          expect(element('.doc-example-live :text').prop('readonly')).toBeFalsy();
          input('checked').check();
          expect(element('.doc-example-live :text').prop('readonly')).toBeTruthy();
        });
      </doc:scenario>
    </doc:example>
 *
 * @element INPUT
 * @param {string} expression Angular expression that will be evaluated.
 */


/**
 * @ngdoc directive
 * @name angular.module.ng.$compileProvider.directive.ng-selected
 * @restrict A
 *
 * @description
 * The HTML specs do not require browsers to preserve the special attributes such as selected.
 * (The presence of them means true and absence means false)
 * This prevents the angular compiler from correctly retrieving the binding expression.
 * To solve this problem, we introduce ng-selected.
 * @example
    <doc:example>
      <doc:source>
        Check me to select: <input type="checkbox" ng-model="selected"><br/>
        <select>
          <option>Hello!</option>
          <option id="greet" ng-selected="selected">Greetings!</option>
        </select>
      </doc:source>
      <doc:scenario>
        it('should select Greetings!', function() {
          expect(element('.doc-example-live #greet').prop('selected')).toBeFalsy();
          input('selected').check();
          expect(element('.doc-example-live #greet').prop('selected')).toBeTruthy();
        });
      </doc:scenario>
    </doc:example>
 *
 * @element OPTION
 * @param {string} expression Angular expression that will be evaluated.
 */


var ngAttributeAliasDirectives = {};


// boolean attrs are evaluated
forEach(BOOLEAN_ATTR, function(propName, attrName) {
  var normalized = directiveNormalize('ng-' + attrName);
  ngAttributeAliasDirectives[normalized] = function() {
    return {
      priority: 100,
      compile: function(tpl, attr) {
        return function(scope, element, attr) {
          attr.$$observers[attrName] = [];
          scope.$watch(attr[normalized], function(value) {
            attr.$set(attrName, !!value);
          });
        };
      }
    };
  };
});


// ng-src, ng-href are interpolated
forEach(['src', 'href'], function(attrName) {
  var normalized = directiveNormalize('ng-' + attrName);
  ngAttributeAliasDirectives[normalized] = function() {
    return {
      priority: 99, // it needs to run after the attributes are interpolated
      compile: function(tpl, attr) {
        return function(scope, element, attr) {
          var value = attr[normalized];
          if (value == undefined) {
            // undefined value means that the directive is being interpolated
            // so just register observer
            attr.$$observers[attrName] = [];
            attr.$observe(normalized, function(value) {
              attr.$set(attrName, value);
            });
          } else {
            // value present means that no interpolation, so copy to native attribute.
            attr.$set(attrName, value);
          }
        };
      }
    };
  };
});