/**
 * Originally Developed by Irubin Consulting Inc. DBA Varien / Magento
 * Released under the OSL License (see below)
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * @copyright  Copyright (c) 2004-2007 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
if(typeof Product=='undefined') {
    var Product = {};
}

/********************* IMAGE ZOOMER ***********************/

Product.Zoom = Class.create();
/**
 * Image zoom control
 *
 * @license
 * @author Moshe Gurvich <moshe@varien.com>
 */
Product.Zoom.prototype = {
    initialize: function(imageEl, trackEl, handleEl, zoomInEl, zoomOutEl){
        this.containerEl = $(imageEl).parentNode;
        this.imageEl = $(imageEl);
        this.handleEl = $(handleEl);
        this.trackEl = $(trackEl);

        this.containerDim = Element.getDimensions(this.containerEl);
        this.imageDim = Element.getDimensions(this.imageEl);
        this.imageDim.ratio = this.imageDim.width/this.imageDim.height;

        this.floorZoom = 1;

        if (this.imageDim.width > this.imageDim.height) {
            this.ceilingZoom = this.imageDim.width / this.containerDim.width;
        } else {
            this.ceilingZoom = this.imageDim.height / this.containerDim.height;
        }

        this.imageX = 0;
        this.imageY = 0;
        this.imageZoom = 1;

        this.sliderSpeed = 0;
        this.sliderAccel = 0;
        this.zoomBtnPressed = false;

        this.showFull = false;

        this.selects = document.getElementsByTagName('select');

        this.draggable = new Draggable(imageEl, {
            starteffect:false,
            reverteffect:false,
            endeffect:false,
            snap:this.contain.bind(this)
        });

		if(this.imageDim.ratio > 1.0) {
			//base around lesser dimention, height
			var sliderMul = (this.containerDim.height/ this.imageDim.height);
		}
		else {
			//base around lesser dimention, width
			var sliderMul = (this.containerDim.width / this.imageDim.width);
		}
		
		var sliderOpts = {
            axis:'horizontal',
            minimum:0,
            maximum:Math.max(Element.getDimensions(this.trackEl).width, Element.getDimensions(this.trackEl).height),
            alignX:0,
            increment:1,
            sliderValue:sliderMul,
            onSlide:this.scale.bind(this),
            onChange:this.scale.bind(this)
        };
        this.slider = new Control.Slider(handleEl, trackEl, sliderOpts);

		this.scale(sliderMul);

        Event.observe(this.imageEl, 'dblclick', this.toggleFull.bind(this));

        Event.observe($(zoomInEl), 'mousedown', this.startZoomIn.bind(this));
        Event.observe($(zoomInEl), 'mouseup', this.stopZooming.bind(this));
        Event.observe($(zoomInEl), 'mouseout', this.stopZooming.bind(this));

        Event.observe($(zoomOutEl), 'mousedown', this.startZoomOut.bind(this));
        Event.observe($(zoomOutEl), 'mouseup', this.stopZooming.bind(this));
        Event.observe($(zoomOutEl), 'mouseout', this.stopZooming.bind(this));
    },

    toggleFull: function () {
        this.showFull = !this.showFull;
        //TODO: hide selects for IE only
        for (i=0; i<this.selects.length; i++) {
            this.selects[i].style.visibility = this.showFull ? 'hidden' : 'visible';
        }
        this.trackEl.style.visibility = this.showFull ? 'hidden' : 'visible';
        this.containerEl.style.overflow = this.showFull ? 'visible' : 'hidden';
        this.containerEl.style.zIndex = this.showFull ? '100' : '1';

        return this;
    },

    scale: function (v) {
        var centerX = (this.containerDim.width*(1-this.imageZoom)/2-this.imageX)/this.imageZoom;
        var centerY = (this.containerDim.height*(1-this.imageZoom)/2-this.imageY)/this.imageZoom;

        this.imageZoom = this.floorZoom+(v*(this.ceilingZoom-this.floorZoom));
		if(this.imageDim.width > this.imageDim.height) {
			this.imageEl.style.width = (this.imageZoom*this.containerDim.width)+'px';
			if(this.containerDim.ratio){
			  this.imageEl.style.height = (this.imageZoom*this.containerDim.width*this.containerDim.ratio)+'px'; // for safari
			}
		}
		else {
			this.imageEl.style.height = (this.imageZoom*this.containerDim.height)+'px';
			if(this.containerDim.ratio){
			  this.imageEl.style.width = (this.imageZoom*this.containerDim.height*this.containerDim.ratio)+'px'; // for safari
			}
		}

        this.imageX = this.containerDim.width*(1-this.imageZoom)/2-centerX*this.imageZoom;
        this.imageY = this.containerDim.height*(1-this.imageZoom)/2-centerY*this.imageZoom;

        this.contain(this.imageX, this.imageY, this.draggable);

        return true;
    },

    startZoomIn: function()
    {
        this.zoomBtnPressed = true;
        this.sliderAccel = .004;
        this.periodicalZoom();
        this.zoomer = new PeriodicalExecuter(this.periodicalZoom.bind(this), .05);
        return this;
    },

    startZoomOut: function()
    {
        this.zoomBtnPressed = true;
        this.sliderAccel = -.004;
        this.periodicalZoom();
        this.zoomer = new PeriodicalExecuter(this.periodicalZoom.bind(this), .05);
        return this;
    },

    stopZooming: function()
    {
        if (!this.zoomer || this.sliderSpeed==0) {
            return;
        }
        this.zoomBtnPressed = false;
        this.sliderAccel = 0;
    },

    periodicalZoom: function()
    {
        if (!this.zoomer) {
            return this;
        }

        if (this.zoomBtnPressed) {
            this.sliderSpeed += this.sliderAccel;
        } else {
            this.sliderSpeed /= 1.5;
            if (Math.abs(this.sliderSpeed)<.001) {
                this.sliderSpeed = 0;
                this.zoomer.stop();
                this.zoomer = null;
            }
        }
        this.slider.value += this.sliderSpeed;

        this.slider.setValue(this.slider.value);
        this.scale(this.slider.value);

        return this;
    },

    contain: function (x,y,draggable) {

        var dim = Element.getDimensions(draggable.element);

		if(this.containerDim.width > dim.width) {
			var xMin = this.containerDim.width - dim.width;
			var xMax = 0;
		}
		else {
			 var xMin = 0, xMax = this.containerDim.width-dim.width;
		}

		if(this.containerDim.height > dim.height) {
			var yMin = this.containerDim.height - dim.height;
			var yMax = 0;
		}
		else {
			var yMin = 0, yMax = this.containerDim.height-dim.height;
		}

        x = x>xMin ? xMin : x;
        x = x<xMax ? xMax : x;
        y = y>yMin ? yMin : y;
        y = y<yMax ? yMax : y;

        this.imageX = x;
        this.imageY = y;

        this.imageEl.style.left = this.imageX+'px';
        this.imageEl.style.top = this.imageY+'px';

        return [x,y];
    }
}