/**
 * @author Ryan Johnson <http://syntacticx.com/>
 * @copyright 2008 PersonalGrid Corporation <http://personalgrid.com/>
 * @package LivePipe UI
 * @license MIT
 * @url http://livepipe.net/control/contextmenu
 * @require prototype.js, livepipe.js
 */

/*global window, document, Prototype, Class, Event, $, $A, $R, Control, $value */

if(typeof(Prototype) == "undefined") {
    throw "Control.ContextMenu requires Prototype to be loaded."; }
if(typeof(Object.Event) == "undefined") {
    throw "Control.ContextMenu requires Object.Event to be loaded."; }

Control.ContextMenu = Class.create({
    initialize: function(container,options){
        Control.ContextMenu.load();
        this.options = Object.extend({
            leftClick: false,
            disableOnShiftKey: true,
            disableOnAltKey: true,
            selectedClassName: 'selected',
            activatedClassName: 'activated',
            animation: true,
            animationCycles: 2,
            animationLength: 300,
            delayCallback: true
        },options || {});
        this.activated = false;
        this.items = this.options.items || [];
        this.container = $(container);
        this.container.observe(this.options.leftClick ? 'click' : (Prototype.Browser.Opera ? 'click' : 'contextmenu'),function(event){
            if(!Control.ContextMenu.enabled || Prototype.Browser.Opera && !event.ctrlKey) {
                return; }
            this.open(event);
        }.bindAsEventListener(this));
    },
    open: function(event){
        if(Control.ContextMenu.current && !Control.ContextMenu.current.close()) {
            return; }
        if(this.notify('beforeOpen',event) === false) {
            return false; }
        this.buildMenu();
        if(this.items.length === 0){
            this.close(event);
            return false;
        }
        this.clicked = Event.element(event);
        Control.ContextMenu.current = this;
        Control.ContextMenu.positionContainer(event);
        Control.ContextMenu.container.show();
        if(this.notify('afterOpen',event) === false) {
            return false; }
        event.stop();
        return true;
    },
    close: function(event){
        if(event) {
            event.stop(); }
        if(this.notify('beforeClose') === false) {
            return false; }
        Control.ContextMenu.current = false;
        this.activated = false;
        Control.ContextMenu.container.removeClassName(this.options.activatedClassName);
        Control.ContextMenu.container.select('li').invoke('stopObserving');
        Control.ContextMenu.container.hide();
        Control.ContextMenu.container.update('');
        if(this.notify('afterClose') === false) {
            return false; }
        return true;
    },
    buildMenu: function(){
        var list = document.createElement('ul');
        Control.ContextMenu.container.appendChild(list);
        this.items.each(function(item){
            if(!(!item.condition || item.condition && item.condition() !== false)) {
                return; }
            var item_container = $(document.createElement('li'));
            item_container.update($value(item.label));
            list.appendChild(item_container);
            item_container[$value(item.enabled) ? 'removeClassName' : 'addClassName']('disabled');
            item_container.observe('mousedown',function(event,item){
                if(!$value(item.enabled)) {
                    return event.stop(); }
                this.activated = $value(item.label);
            }.bindAsEventListener(this,item));
            item_container.observe('click',this.selectMenuItem.bindAsEventListener(this,item,item_container));
            item_container.observe('contextmenu',this.selectMenuItem.bindAsEventListener(this,item,item_container));
        }.bind(this));
    },
    addItem: function(params){
        if (!('enabled' in params)) { params.enabled = true; }
        this.items.push(params);
        return this;
    },
    destroy: function(){
        this.container.stopObserving(Prototype.Browser.Opera || this.options.leftClick ? 'click' : 'contextmenu');
        this.items = [];
    },
    selectMenuItem: function(event,item,item_container){
        if(!$value(item.enabled)) {
            return event.stop(); }
        if(!this.activated || this.activated == $value(item.label)){
            if(this.options.animation){
                Control.ContextMenu.container.addClassName(this.options.activatedClassName);
                $A($R(0,this.options.animationCycles * 2)).each(function(i){
                    window.setTimeout(function(){
                        item_container.toggleClassName(this.options.selectedClassName);
                    }.bind(this),i * parseInt(this.options.animationLength / (this.options.animationCycles * 2), 10));
                }.bind(this));
                window.setTimeout(function(){
                    if(this.close() && this.options.delayCallback) {
                        item.callback(this.clicked); }
                }.bind(this),this.options.animationLength);
                if(!this.options.delayCallback) {
                    item.callback(this.clicked); }
            }else if(this.close()) {
                item.callback(this.clicked); }
        }
        event.stop();
        return false;
    }
});
Object.extend(Control.ContextMenu,{
    loaded: false,
    capture_all: false,
    menus: [],
    current: false,
    enabled: false,
    offset: 4,
    load: function(capture_all){
        if(Control.ContextMenu.loaded) {
            return; }
        Control.ContextMenu.loaded = true;
        if(typeof(capture_all) == 'undefined') {
            capture_all = false; }
        Control.ContextMenu.capture_all = capture_all;
        Control.ContextMenu.container = $(document.createElement('div'));
        Control.ContextMenu.container.id = 'control_contextmenu';
        Control.ContextMenu.container.style.position = 'absolute';
        Control.ContextMenu.container.style.zIndex = 99999;
        Control.ContextMenu.container.hide();
        document.body.appendChild(Control.ContextMenu.container);
        Control.ContextMenu.enable();
    },
    enable: function(){
        Control.ContextMenu.enabled = true;
        Event.observe(document.body,'click',Control.ContextMenu.onClick);
        if(Control.ContextMenu.capture_all) {
            Event.observe(document.body,'contextmenu',Control.ContextMenu.onContextMenu); }
    },
    disable: function(){
        Event.stopObserving(document.body,'click',Control.ContextMenu.onClick);
        if(Control.ContextMenu.capture_all) {
            Event.stopObserving(document.body,'contextmenu',Control.ContextMenu.onContextMenu);    }
    },
    onContextMenu: function(event){
        event.stop();
        return false;
    },
    onClick: function(){
        if(Control.ContextMenu.current) {
            Control.ContextMenu.current.close(); }
    },
    positionContainer: function(event){
        var dimensions = Control.ContextMenu.container.getDimensions();
        var top = Event.pointerY(event);
        var left = Event.pointerX(event);
        var bottom = dimensions.height + top;
        var right = dimensions.width + left;
        var viewport_dimensions = document.viewport.getDimensions();
        var viewport_scroll_offsets = document.viewport.getScrollOffsets();
        if(bottom > viewport_dimensions.height + viewport_scroll_offsets.top) {
            top -= bottom - ((viewport_dimensions.height  + viewport_scroll_offsets.top) - Control.ContextMenu.offset); }
        if(right > viewport_dimensions.width + viewport_scroll_offsets.left) {
            left -= right - ((viewport_dimensions.width + viewport_scroll_offsets.left) - Control.ContextMenu.offset); }
        Control.ContextMenu.container.setStyle({
            top: top + 'px',
            left: left + 'px'
        });
    }
});
Object.Event.extend(Control.ContextMenu);
