/**
 * @class Ext.CompositeElement
 * 
This class encapsulates a collection of DOM elements, providing methods to filter
 * members, or to perform collective actions upon the whole set.
 *
 * Example:

var els = Ext.select("#some-el div.some-class");
// or select directly from an existing element
var el = Ext.get('some-el');
el.select('div.some-class');

els.setWidth(100); // all elements become 100 width
els.hide(true); // all elements fade out and hide
// or
els.setWidth(100).hide(true);

 */
Ext.CompositeElement = function(els, root) {
    
/**
     * 
The Array of DOM elements which this CompositeElement encapsulates. Read-only.
     * 
This will not usually be accessed in developers' code, but developers wishing
     * to augment the capabilities of the CompositeElement class may use it when adding
     * methods to the class.
     * 
For example to add the nextAll method to the class to add all
     * following siblings of selected elements, the code would be
Ext.override(Ext.CompositeElement, {
    nextAll: function() {
        var els = this.elements, i, l = els.length, n, r = [], ri = -1;

//      Loop through all elements in this Composite, accumulating
//      an Array of all siblings.
        for (i = 0; i < l; i++) {
            for (n = els[i].nextSibling; n; n = n.nextSibling) {
                r[++ri] = n;
            }
        }

//      Add all found siblings to this Composite
        return this.add(r);
    }
});
     * @type Array
     * @property elements
     */
    this.elements = [];
    this.add(els, root);
    this.el = new Ext.Element.Flyweight();
};

Ext.CompositeElement.prototype = {
    isComposite: true,

    // private
    getElement : function(el) {
        // Set the shared flyweight dom property to the current element
        var e = this.el;
        e.dom = el;
        e.id = el.id;
        return e;
    },

    // private
    transformElement : function(el) {
        return Ext.getDom(el);
    },

    
/**
     * Returns the number of elements in this Composite.
     * @return Number
     */
    getCount : function() {
        return this.elements.length;
    },

    
/**
     * Adds elements to this Composite object.
     * @param {Mixed} els Either an Array of DOM elements to add, or another Composite object who's elements should be added.
     * @return {CompositeElement} This Composite object.
     */
    add : function(els, root) {
        var me = this,
            elements = me.elements;
        if (!els) {
            return this;
        }
        if (typeof els == 'string') {
            els = Ext.Element.selectorFunction(els, root);
        }
        else if (els.isComposite) {
            els = els.elements;
        }
        else if (!Ext.isIterable(els)) {
            els = [els];
        }

        for (var i = 0, len = els.length; i < len; ++i) {
            elements.push(me.transformElement(els[i]));
        }

        return me;
    },

    invoke : function(fn, args) {
        var me = this,
            els = me.elements,
            len = els.length,
            e,
            i;

        for (i = 0; i < len; i++) {
            e = els[i];
            if (e) {
                Ext.Element.prototype[fn].apply(me.getElement(e), args);
            }
        }
        return me;
    },
    
/**
     * Returns a flyweight Element of the dom element object at the specified index
     * @param {Number} index
     * @return {Ext.Element}
     */
    item : function(index) {
        var me = this,
            el = me.elements[index],
            out = null;

        if (el){
            out = me.getElement(el);
        }
        return out;
    },

    // fixes scope with flyweight
    addListener : function(eventName, handler, scope, opt) {
        var els = this.elements,
            len = els.length,
            i, e;

        for (i = 0; i/**
     * 
Calls the passed function for each element in this composite.
     * @param {Function} fn The function to call. The function is passed the following parameters:

     * 
el : Element
The current Element in the iteration.
     * This is the flyweight (shared) Ext.Element instance, so if you require a
     * a reference to the dom node, use el.dom.
     * 
c : Composite
This Composite object.
     * 
idx : Number
The zero-based index in the iteration.
     * 
     * @param {Object} scope (optional) The scope (this reference) in which the function is executed. (defaults to the Element)
     * @return {CompositeElement} this
     */
    each : function(fn, scope) {
        var me = this,
            els = me.elements,
            len = els.length,
            i, e;

        for (i = 0; i/**
    * Clears this Composite and adds the elements passed.
    * @param {Mixed} els Either an array of DOM elements, or another Composite from which to fill this Composite.
    * @return {CompositeElement} this
    */
    fill : function(els) {
        var me = this;
        me.elements = [];
        me.add(els);
        return me;
    },

    
/**
     * Filters this composite to only elements that match the passed selector.
     * @param {String/Function} selector A string CSS selector or a comparison function.
     * The comparison function will be called with the following arguments:

     * 
el : Ext.Element
The current DOM element.
     * 
index : Number
The current index within the collection.
     * 
     * @return {CompositeElement} this
     */
    filter : function(selector) {
        var els = [],
            me = this,
            elements = me.elements,
            fn = Ext.isFunction(selector) ? selector
                : function(el){
                    return el.is(selector);
                };

        me.each(function(el, self, i){
            if(fn(el, i) !== false){
                els[els.length] = me.transformElement(el);
            }
        });
        me.elements = els;
        return me;
    },

    
/**
     * Returns the first Element
     * @return {Ext.Element}
     */
    first : function() {
        return this.item(0);
    },

    
/**
     * Returns the last Element
     * @return {Ext.Element}
     */
    last : function() {
        return this.item(this.getCount()-1);
    },

    
/**
     * Returns true if this composite contains the passed element
     * @param {Mixed} el The id of an element, or an Ext.Element, or an HtmlElement to find within the composite collection.
     * @return Boolean
     */
    contains : function(el) {
        return this.indexOf(el) != -1;
    },

    
/**
     * Find the index of the passed element within the composite collection.
     * @param {Mixed} el The id of an element, or an Ext.Element, or an HtmlElement to find within the composite collection.
     * @return Number The index of the passed Ext.Element in the composite collection, or -1 if not found.
     */
    indexOf : function(el) {
        return this.elements.indexOf(this.transformElement(el));
    },

    
/**
     * Removes all elements.
     */
    clear : function() {
        this.elements = [];
    }
};

Ext.CompositeElement.prototype.on = Ext.CompositeElement.prototype.addListener;

(function(){
var fnName,
    ElProto = Ext.Element.prototype,
    CelProto = Ext.CompositeElement.prototype;

for (fnName in ElProto) {
    if (Ext.isFunction(ElProto[fnName])) {
        (function(fnName) {
            CelProto[fnName] = CelProto[fnName] || function(){
                return this.invoke(fnName, arguments);
            };
        }).call(CelProto, fnName);

    }
}
})();

if(Ext.DomQuery) {
    Ext.Element.selectorFunction = Ext.DomQuery.select;
}

/**
 * Selects elements based on the passed CSS selector to enable {@link Ext.Element Element} methods
 * to be applied to many related elements in one statement through the returned {@link Ext.CompositeElement CompositeElement} or
 * {@link Ext.CompositeElement CompositeElement} object.
 * @param {String/Array} selector The CSS selector or an array of elements
 * @param {HTMLElement/String} root (optional) The root element of the query or id of the root
 * @return {CompositeElement}
 * @member Ext.Element
 * @method select
 */
Ext.Element.select = function(selector, root, composite) {
    var els;
    composite = (composite === false) ? false : true;
    if (typeof selector == "string") {
        els = Ext.Element.selectorFunction(selector, root);
    } else if (selector.length !== undefined) {
        els = selector;
    } else {
        throw new Error("Invalid selector");
    }
    return composite ? new Ext.CompositeElement(els) : els;
};
/**
 * Selects elements based on the passed CSS selector to enable {@link Ext.Element Element} methods
 * to be applied to many related elements in one statement through the returned {@link Ext.CompositeElement CompositeElement} or
 * {@link Ext.CompositeElement CompositeElement} object.
 * @param {String/Array} selector The CSS selector or an array of elements
 * @param {HTMLElement/String} root (optional) The root element of the query or id of the root
 * @return {CompositeElement}
 * @member Ext
 * @method select
 */
Ext.select = Ext.Element.select;

// Backwards compatibility with desktop
Ext.CompositeElementLite = Ext.CompositeElement;

/**
 * @class Ext.CompositeElementLite
 */
Ext.apply(Ext.CompositeElementLite.prototype, {
    addElements : function(els, root){
        if(!els){
            return this;
        }
        if(typeof els == "string"){
            els = Ext.Element.selectorFunction(els, root);
        }
        var yels = this.elements;
        Ext.each(els, function(e) {
            yels.push(Ext.get(e));
        });
        return this;
    },

    
/**
    * Removes the specified element(s).
    * @param {Mixed} el The id of an element, the Element itself, the index of the element in this composite
    * or an array of any of those.
    * @param {Boolean} removeDom (optional) True to also remove the element from the document
    * @return {CompositeElement} this
    */
    removeElement : function(keys, removeDom){
        var me = this,
            els = this.elements,
            el;
        Ext.each(keys, function(val){
            if ((el = (els[val] || els[val = me.indexOf(val)]))) {
                if(removeDom){
                    if(el.dom){
                        el.remove();
                    }else{
                        Ext.removeNode(el);
                    }
                }
                els.splice(val, 1);
            }
        });
        return this;
    },

    
/**
    * Replaces the specified element with the passed element.
    * @param {Mixed} el The id of an element, the Element itself, the index of the element in this composite
    * to replace.
    * @param {Mixed} replacement The id of an element or the Element itself.
    * @param {Boolean} domReplace (Optional) True to remove and replace the element in the document too.
    * @return {CompositeElement} this
    */
    replaceElement : function(el, replacement, domReplace){
        var index = !isNaN(el) ? el : this.indexOf(el),
            d;
        if(index > -1){
            replacement = Ext.getDom(replacement);
            if(domReplace){
                d = this.elements[index];
                d.parentNode.insertBefore(replacement, d);
                Ext.removeNode(d);
            }
            this.elements.splice(index, 1, replacement);
        }
        return this;
    }
});