/* object contains jQuery-contextMenu
 * https://github.com/medialize/jQuery-contextMenu
 */
var CloudCommander, Util, DOM, $;
(function(CloudCmd, Util, DOM){
    'use strict';
    
    var KeyBinding                  = CloudCmd.KeyBinding,
        MenuSeted                   = false,
        Menu                        = {},
        Position,
        UploadToItemNames;
    
    Menu.dir                        = '/lib/client/menu/';
    
    /* enable and disable menu constant */
    Menu.ENABLED                    = false;
    
    /* PRIVATE FUNCTIONS */
    
    /** function shows editor
     * @param pReadOnly
     */
    function showEditor(pReadOnly){
        DOM.Images.showLoad();
        var lEditor = CloudCmd[pReadOnly ? 'Viewer' : 'Editor'],
        
            lResult = Util.exec(lEditor, pReadOnly);
        
        if(!lResult){
            lEditor = lEditor.get();
            if(lEditor)
                Util.exec(lEditor.show);
        }
    }
    
    /* function read data from modules.json 
     * and build array of menu items of "upload to"
     * menu
     */
    function setUploadToItemNames(pCallBack){
        CloudCmd.getModules(function(pModules){
            var lStorage    = 'storage',
                lItems = pModules[lStorage];
            
            for(var i = 0, n = pModules.length; i < n; i++ ){
                lItems = pModules[i][lStorage];
                
                if(lItems)
                    break;
            }
            
            UploadToItemNames   = lItems || [];
            
            Util.exec(pCallBack);
        });
    }
    
    /** 
     * function get menu item object for Upload To
     */
    function getUploadToItems(pObjectName){
        var lObj        = {};
        if( Util.isArray(pObjectName) ){
            
            var n = pObjectName.length;
            for(var i = 0; i < n; i++){
                var lStr = pObjectName[i];
                lObj[lStr] =  getUploadToItems( lStr );
            }
        }
        else if( Util.isString(pObjectName) ){
            lObj.name       = pObjectName;
             
            lObj.callback   = function(key, opt){
                DOM.getCurrentData(function(pParams){
                    var lObject     = CloudCmd[pObjectName];
                    
                    Util.ifExec('init' in lObject,
                        function(){
                            CloudCmd[pObjectName].uploadFile(pParams);
                        },
                        
                        function(pCallBack){
                            Util.exec(lObject, pCallBack);
                        });
                });
            
                Util.log('Uploading to ' + pObjectName+ '...');
            };
        }
        
        return lObj;
    }
       
    /**
     * get menu item
     */
    function getItem(pName, pCallBack){
        var lRet = {
            name : pName
        };
        
        if(Util.isFunction(pCallBack) )
            lRet.callback    = pCallBack;
        
        else if (Util.isObject(pCallBack))
            lRet.items       = pCallBack;
        
        return lRet;
    }
    
    /**
     * get all menu items
     * pItems = [{pName, pFunc}]
     */
     function getAllItems(pItems){
        var lRet = {},
            lName,
            lFunc;
        
        if(pItems)
            for(lName in pItems){
                lFunc = pItems[lName];
                lRet[lName] = getItem(lName, lFunc);
            }
        
        return lRet;
     }
    
    /** 
     * function return configureation for menu
     */
    function getConfig (){
        return{
            // define which elements trigger this menu
            selector: 'li',
            
            callback: function(key, options) {
                var m = "clicked: " + key;
                Util.log(m, options);
                
                KeyBinding.set();
            },
            
            // define the elements of the menu
            items: getAllItems({
                'View'      : Util.retExec(showEditor, true),
                'Edit'      : Util.retExec(showEditor, false),
                'Delete'    : Util.retExec(DOM.promptRemoveCurrent),
                'Upload to' : getUploadToItems(UploadToItemNames)
                    /*
                    [
                        'DropBox',
                        'GDrive',
                        'GitHub',
                        'VK'
                    ])*/,
                'Download' : function(key, opt){
                        DOM.Images.showLoad();
                        
                        var lPath   = DOM.getCurrentPath(),
                            lId     = DOM.getIdBySrc(lPath);
                        
                        Util.log('downloading file ' + lPath +'...');
                        
                        lPath = lPath + '?download';
                        
                        if(!DOM.getById(lId)){
                            var lDownload = DOM.anyload({
                                name        : 'iframe',
                                async       : false,
                                className   : 'hidden',
                                src         : lPath,
                                func        : Util.retFunc(DOM.Images.hideLoad)
                            });
                            
                            DOM.Images.hideLoad();
                            setTimeout(function() {
                                document.body.removeChild(lDownload);
                            }, 10000);
                        }
                        else
                            DOM.Images.showError({
                                responseText: 'Error: You trying to' + 
                                    'download same file to often'});
                    }
            })
        };
    }
    
    /** function loads css and js of Menu
     * @param pCallBack
     */
    function load(pCallBack){
        console.time('menu load');
        
        var lDir    = Menu.dir,
            lFiles  = [
                lDir + 'contextMenu.js',
                lDir + 'contextMenu.css'
            ];
        
        DOM.anyLoadInParallel(lFiles, function(){
            console.timeEnd('menu load');
            $.contextMenu.handle.keyStop = $.noop;
            Util.exec(pCallBack);
        });
    }
    
    function set(){
        if(!MenuSeted){
            $.contextMenu(getConfig());
            /*
             * Menu works in some crazy way so need a
             * little hack to get every thing work out.
             * When menu shows up, it drawing invisible 
             * layer wich hides all elements of
             * Cloud Commander so it could not handle
             * onclick events. To get every thing work
             * how expected we hide out invisible layer
             * so for observer it is nothing special
             * is not going on. All magic happening in
             * DOM tree
             */
            DOM.addClickListener(function(pEvent){
                /* if clicked on menu item */
                var lClassName = pEvent.target.parentElement.className;
                switch(lClassName){
                    case 'context-menu-item':
                        return;
                    case 'context-menu-list ':
                        return;
                }
                
                if(pEvent && pEvent.x){
                    var lLayer = DOM.getById('context-menu-layer');
                    if(lLayer){
                        var lStyle;
                        
                        if(lLayer)
                            lStyle = lLayer.style.cssText;
                        /* hide invisible menu layer */
                        if(lStyle)
                            lLayer.style.cssText = lStyle
                                .replace('z-index: 1', 'z-index:-1');
                        
                        /* get element by point */
                        var lElement    = document.elementFromPoint(pEvent.x, pEvent.y),
                            lTag        = lElement.tagName,
                            lParent;
                        
                        if(lTag === 'A' || lTag === 'SPAN'){
                            if (lElement.tagName === 'A')
                                lParent = lElement.parentElement.parentElement;
                            else if(lElement.tagName === 'SPAN')
                                lParent = lElement.parentElement;
                                
                            if(lParent.className === '')
                                DOM.setCurrentFile(lParent);
                        }
                        
                        /* show invisible menu layer */
                        if(lLayer && lStyle)
                            lLayer.style.cssText = lStyle;
                        
                        KeyBinding.set();
                    }
                }
            });
            
            MenuSeted = true;
        }
    }
    
    
    /** function shows menu for the first time
     * right away after loading
     */
    Menu.show        = function(){
        set();
        DOM.Images.hideLoad();
        
        if(Position && !Position.x )
            Position = null;
        
        $('li').contextMenu(Position);
    };
    
    /* key binding function */
    Menu.init        = function(pPosition){
        Position = pPosition;
        
        Util.loadOnLoad([
            Menu.show,
            setUploadToItemNames,
            load,
            DOM.jqueryLoad
        ]);
        
        var key_event = function(pEvent){
            var lKEY        = CloudCmd.KEY,
                lKeyCode    = pEvent.keyCode;
            /* если клавиши можно обрабатывать */
            if( KeyBinding.get() ){
                /* if shift + F10 pressed */
                if(lKeyCode === lKEY.F10 && pEvent.shiftKey){
                    $( DOM.getCurrentFile() ).contextMenu();
                    DOM.preventDefault(pEvent);
                }
            }
            else if (lKeyCode === lKEY.ESC)
                KeyBinding.set();
        };
           
        /* добавляем обработчик клавишь */
        DOM.addKeyListener( key_event );
    };
    
    CloudCmd.Menu                   = Menu;
})(CloudCommander, Util, DOM);