'use strict';

var $animateMinErr = minErr('$animate');

/**
 * @ngdoc object
 * @name ng.$animateProvider
 *
 * @description
 * Default implementation of $animate that doesn't perform any animations, instead just
 * synchronously performs DOM
 * updates and calls done() callbacks.
 *
 * In order to enable animations the ngAnimate module has to be loaded.
 *
 * To see the functional implementation check out src/ngAnimate/animate.js
 */
var $AnimateProvider = ['$provide', function($provide) {

  
  this.$$selectors = {};


  /**
   * @ngdoc function
   * @name ng.$animateProvider#register
   * @methodOf ng.$animateProvider
   *
   * @description
   * Registers a new injectable animation factory function. The factory function produces the
   * animation object which contains callback functions for each event that is expected to be
   * animated.
   *
   *   * `eventFn`: `function(Element, doneFunction)` The element to animate, the `doneFunction`
   *   must be called once the element animation is complete. If a function is returned then the
   *   animation service will use this function to cancel the animation whenever a cancel event is
   *   triggered.
   *
   *
   *<pre>
   *   return {
     *     eventFn : function(element, done) {
     *       //code to run the animation
     *       //once complete, then run done()
     *       return function cancellationFunction() {
     *         //code to cancel the animation
     *       }
     *     }
     *   }
   *</pre>
   *
   * @param {string} name The name of the animation.
   * @param {function} factory The factory function that will be executed to return the animation
   *                           object.
   */
  this.register = function(name, factory) {
    var key = name + '-animation';
    if (name && name.charAt(0) != '.') throw $animateMinErr('notcsel',
        "Expecting class selector starting with '.' got '{0}'.", name);
    this.$$selectors[name.substr(1)] = key;
    $provide.factory(key, factory);
  };

  /**
   * @ngdoc function
   * @name ng.$animateProvider#classNameFilter
   * @methodOf ng.$animateProvider
   *
   * @description
   * Sets and/or returns the CSS class regular expression that is checked when performing
   * an animation. Upon bootstrap the classNameFilter value is not set at all and will
   * therefore enable $animate to attempt to perform an animation on any element.
   * When setting the classNameFilter value, animations will only be performed on elements
   * that successfully match the filter expression. This in turn can boost performance
   * for low-powered devices as well as applications containing a lot of structural operations.
   * @param {RegExp=} expression The className expression which will be checked against all animations
   * @return {RegExp} The current CSS className expression value. If null then there is no expression value
   */
  this.classNameFilter = function(expression) {
    if(arguments.length === 1) {
      this.$$classNameFilter = (expression instanceof RegExp) ? expression : null;
    }
    return this.$$classNameFilter;
  };

  this.$get = ['$timeout', function($timeout) {

    /**
     *
     * @ngdoc object
     * @name ng.$animate
     * @description The $animate service provides rudimentary DOM manipulation functions to
     * insert, remove and move elements within the DOM, as well as adding and removing classes.
     * This service is the core service used by the ngAnimate $animator service which provides
     * high-level animation hooks for CSS and JavaScript.
     *
     * $animate is available in the AngularJS core, however, the ngAnimate module must be included
     * to enable full out animation support. Otherwise, $animate will only perform simple DOM
     * manipulation operations.
     *
     * To learn more about enabling animation support, click here to visit the {@link ngAnimate
     * ngAnimate module page} as well as the {@link ngAnimate.$animate ngAnimate $animate service
     * page}.
     */
    return {

      /**
       *
       * @ngdoc function
       * @name ng.$animate#enter
       * @methodOf ng.$animate
       * @function
       * @description Inserts the element into the DOM either after the `after` element or within
       *   the `parent` element. Once complete, the done() callback will be fired (if provided).
       * @param {jQuery/jqLite element} element the element which will be inserted into the DOM
       * @param {jQuery/jqLite element} parent the parent element which will append the element as
       *   a child (if the after element is not present)
       * @param {jQuery/jqLite element} after the sibling element which will append the element
       *   after itself
       * @param {function=} done callback function that will be called after the element has been
       *   inserted into the DOM
       */
      enter : function(element, parent, after, done) {
        if (after) {
          after.after(element);
        } else {
          if (!parent || !parent[0]) {
            parent = after.parent();
          }
          parent.append(element);
        }
        done && $timeout(done, 0, false);
      },

      /**
       *
       * @ngdoc function
       * @name ng.$animate#leave
       * @methodOf ng.$animate
       * @function
       * @description Removes the element from the DOM. Once complete, the done() callback will be
       *   fired (if provided).
       * @param {jQuery/jqLite element} element the element which will be removed from the DOM
       * @param {function=} done callback function that will be called after the element has been
       *   removed from the DOM
       */
      leave : function(element, done) {
        element.remove();
        done && $timeout(done, 0, false);
      },

      /**
       *
       * @ngdoc function
       * @name ng.$animate#move
       * @methodOf ng.$animate
       * @function
       * @description Moves the position of the provided element within the DOM to be placed
       * either after the `after` element or inside of the `parent` element. Once complete, the
       * done() callback will be fired (if provided).
       * 
       * @param {jQuery/jqLite element} element the element which will be moved around within the
       *   DOM
       * @param {jQuery/jqLite element} parent the parent element where the element will be
       *   inserted into (if the after element is not present)
       * @param {jQuery/jqLite element} after the sibling element where the element will be
       *   positioned next to
       * @param {function=} done the callback function (if provided) that will be fired after the
       *   element has been moved to its new position
       */
      move : function(element, parent, after, done) {
        // Do not remove element before insert. Removing will cause data associated with the
        // element to be dropped. Insert will implicitly do the remove.
        this.enter(element, parent, after, done);
      },

      /**
       *
       * @ngdoc function
       * @name ng.$animate#addClass
       * @methodOf ng.$animate
       * @function
       * @description Adds the provided className CSS class value to the provided element. Once
       * complete, the done() callback will be fired (if provided).
       * @param {jQuery/jqLite element} element the element which will have the className value
       *   added to it
       * @param {string} className the CSS class which will be added to the element
       * @param {function=} done the callback function (if provided) that will be fired after the
       *   className value has been added to the element
       */
      addClass : function(element, className, done) {
        className = isString(className) ?
                      className :
                      isArray(className) ? className.join(' ') : '';
        forEach(element, function (element) {
          jqLiteAddClass(element, className);
        });
        done && $timeout(done, 0, false);
      },

      /**
       *
       * @ngdoc function
       * @name ng.$animate#removeClass
       * @methodOf ng.$animate
       * @function
       * @description Removes the provided className CSS class value from the provided element.
       * Once complete, the done() callback will be fired (if provided).
       * @param {jQuery/jqLite element} element the element which will have the className value
       *   removed from it
       * @param {string} className the CSS class which will be removed from the element
       * @param {function=} done the callback function (if provided) that will be fired after the
       *   className value has been removed from the element
       */
      removeClass : function(element, className, done) {
        className = isString(className) ?
                      className :
                      isArray(className) ? className.join(' ') : '';
        forEach(element, function (element) {
          jqLiteRemoveClass(element, className);
        });
        done && $timeout(done, 0, false);
      },

      enabled : noop
    };
  }];
}];