/*
The MIT License

Copyright (c) 2009 Niko Ni (bluepspower@163.com)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

// namespace
Ext.ns('Ext.ux');

/**
 * @class Ext.ux.FisheyeMenu
 * @extends Ext.util.Observable
 * @author Niko Ni
 * @version v0.3
 * @create 2009-06-26
 * @update 2009-06-28
 */
Ext.ux.FisheyeMenu = Ext.extend(/*Ext.Component, {*/Ext.util.Observable, {
    //------------------------------------------------------------
    // config options
    //------------------------------------------------------------
    /**
     * @config {Array} array of fisheye menu config object items
     *                 Example object item:
     *                 {
     *                     text: 'some text',
     *                     imagePath: 'some image path',
     *                     url: 'some url (optional)',
     *                     tip: 'some tip (optional)',
     *                     target: 'target element (optional)'
     *                 }
     */
    items : [],

	/**
	 * @config {Mixed Element} container element
	 */
//	renderTo : document.body,
    renderTo: 'fisheye-menu',//Ext.getBody(),

    /**
     * @config {Number} the minimum width for each menu item
     */
    itemWidth : 50,

    /**
     * @config {Number} the distance from element that make item interaction
     */    
    vicinity : 35,

    /**
     * @config {String} horizontal alignment (left|center|right)
     */
    hAlign : 'center',

    /**
     * @config {String} vertical alignment (top|bottom)
     */
    vAlign : 'bottom',

	/**
	 * @config {Boolean} show menu item title or not
	 */
	showTitle : true,

    //------------------------------------------------------------
    // class constructor
    //------------------------------------------------------------
    /**
     * @constructor
     * @param config
     */
    constructor : function(config) {
        Ext.apply(this, config);
        Ext.ux.FisheyeMenu.superclass.constructor.call(this, config);

        // add custom event
        this.addEvents('change');

        // initialize
		this.init();
    },
    

    //------------------------------------------------------------
    // public/private methods
    //------------------------------------------------------------
    /**
     * @private
     */
    init : function() {
        this.el = Ext.get(this.renderTo);		

		// init markup
        this.initMarkup();

		// init events
        this.initEvents();
    },

    /**
     * @private
     */
    initMarkup : function() {
		// set necessary css class
		this.setClass();

		// for wrap class
//		this.el.addClass(this.wrapCls);
		this.el.addCls(this.wrapCls);

        // fisheye menu container
        this.containerEl = this.el.createChild({
            tag : 'div',
            cls : 'ux-fisheye-menu-container ' + this.vAlignCls
        });

		var sId = this.el.getAttribute('id') || Ext.id();

        // build fisheye menu items
        Ext.each(this.items, function(item, index) {
			var sTitle = this.showTitle === true ? (item.tip || item.text) : '';
			var arr = [{
                tag : 'span',
                html : item.text
            }, {
                tag : 'img',
                src : item.imagePath,
                alt : sTitle
            }];
			if(this.vOrient === 'top') {
				arr = arr.reverse();
			}

            this.containerEl.createChild({
				tag : 'a',
				id : sId + '-' + index,
				cls : 'ux-fisheye-menu-item ' + this.vAlignCls,
//				href : item.url || '#',
				title : sTitle,
				target : item.target || '_blank',
				children : arr,
				id : item.id,
				idComponent : item.idComponent
            });
        }, this);
		
        this.menuItems = this.containerEl.select('a.ux-fisheye-menu-item');
        this.itemCount = this.menuItems.getCount();

		// render UI
		this.onRender();
    },
    
    /**
     * @private
     */
    initEvents : function() {
		// hover or not
        this.menuItems.on('mouseover', this.onItemHover, this);
        this.menuItems.on('mouseout', this.onItemOut, this);

		// for viewport mousemove event
		Ext.getBody().on('mousemove', this.onItemMove, this);

		// for viewport resize event
		Ext.EventManager.on(window, 'resize', this.onRender, this);

		// for custom event
        this.containerEl.on('click', 
        		function(ev, t) {
        			window.MyDesktop.getModule(t.id).createWindow();
        		}, this, 
        		{
        			delegate : 'a'
        		}
        );
    },

	/**
	 * @private
	 */
	setClass : function() {
		this.vOrient = this.vAlign.toLowerCase();
		this.wrapCls = 'menu-wrap-' + this.vOrient;
		this.vAlignCls = 'menu-align-' + this.vOrient;
	},

    /**
     * @private
     */
    onItemMove : function(ev, t) {
		// pointer
        var p = ev.getXY(),
			posX,
			posY,
			increment = 0;
		switch(this.hAlign.toLowerCase()) {
			case 'left':
				posX = p[0] - this.pos[0];
				break;
			case 'right':
				posX = p[0] - this.pos[0] - this.el.getWidth() + this.itemWidth * this.itemCount;
				break;
			default:
				posX = p[0] - this.pos[0] - (this.el.getWidth() - this.itemWidth * this.itemCount)/2 - this.itemWidth/2;
				break;
		}

        posY = Math.pow(p[1] - this.pos[1] - this.el.getHeight()/2, 2);

        this.menuItems.each(function(item, all, index) {
			// distance mathematical calculation reference from http://interface.eyecon.ro
            var d = Math.sqrt(Math.pow(posX - index * this.itemWidth, 2) + posY);
            d -= this.itemWidth/2;
            d = d < 0 ? 0 : d;
            d = d > this.vicinity ? this.vicinity : d;
            d = this.vicinity - d;
            var extraWidth = this.itemWidth * d / this.vicinity;
            item.setStyle({
                left : this.itemWidth * index + increment + 'px',
                width : this.itemWidth + extraWidth + 'px'
            });
            increment += extraWidth;
        }, this);

        this.setPosContainer(increment);
    },

    /**
     * @private
     */
    onItemHover : function(ev, t) {
        var target = Ext.get(t);
        target = target.is('img') ? target.up('a') : target;
		var itemText = target.child('span');
        if(itemText) {
			itemText.show();
		}
    },

    /**
     * @private
     */
    onItemOut : function(ev, t) {
        var target = Ext.get(t);
        target = target.is('img') ? target.up('a') : target;
		var itemText = target.child('span');
        if(itemText) {
			itemText.hide();
		}
    },

	/**
	 * @private
	 */
	onRender : function() {
		this.pos = this.el.getXY();
        this.setPosContainer(0);
        this.setPosMenuItems();
	},

	/**
	 * @private
	 */
	doAlignment : function() {
		var aWrapCls = ['menu-wrap-top', 'menu-wrap-bottom'],
			aAlignCls = ['menu-align-top', 'menu-align-bottom'];

		this.setClass();
		this.el.removeClass(aWrapCls).addClass(this.wrapCls);
		this.containerEl.removeClass(aAlignCls).addClass(this.vAlignCls);

		this.menuItems.each(function(item, all, index) {
			var itemText = item.child('span');
			var itemTextCfg = {
				tag : 'span',
				html : itemText.dom.innerHTML
			};
			item.removeClass(aAlignCls).addClass(this.vAlignCls);

			if(this.vAlign.toLowerCase() === 'top') {
				if(!item.last().is('span')) {
					item.createChild(itemTextCfg);
					itemText.remove();
				}
			} else {
				if(!item.first().is('span')) {
					item.insertFirst(itemTextCfg);
					itemText.remove();
				}
			}			
		}, this);
	},
		
	/**
	 * @public
	 */
	setAlign : function(cfg) {
		var isChange = false;
		// for horizontal alignment
		if(cfg.hAlign) {
			var sHAlign = cfg.hAlign.toLowerCase();
			if(sHAlign != this.hAlign) {
				this.hAlign = sHAlign;
				isChange = true;
			}
		}
		// for vertical alignment
		if(cfg.vAlign) {
			var sVAlign = cfg.vAlign.toLowerCase();			
			if(sVAlign != this.vAlign) {
				this.vAlign = sVAlign;
				isChange = true;
			}
		}

		if(isChange) {
			this.doAlignment();
			this.onRender();
		}


	},

    /**
     * @private
     */
    setPosContainer : function(increment) {
		var iLeft;
		switch(this.hAlign.toLowerCase()) {
			case 'left':
				iLeft = - increment/this.itemCount;
				break;
			case 'right':
				iLeft = (this.el.getWidth() - this.itemWidth * this.itemCount) - increment/2;
				break;
			default:
				iLeft = (this.el.getWidth() - this.itemWidth * this.itemCount)/2 - increment/2;
				break;
		}

		this.containerEl.setStyle({
			left : iLeft + 'px',
			width : this.itemWidth * this.itemCount + increment + 'px'
		});
    },

    /**
     * @private
     */    
    setPosMenuItems : function() {
        this.menuItems.each(function(item, all, index) {
            item.setStyle({
                left : this.itemWidth * index + 'px',
                width : this.itemWidth + 'px'
            });
        }, this);
    }

});  // end of Ext.ux.FisheyeMenu