/**
 * Copyright (c) 2006-2015, JGraph Ltd
 * Copyright (c) 2006-2015, Gaudenz Alder
 */
/**
 * Class: mxImageShape
 *
 * Extends <mxShape> to implement an image shape. This shape is registered
 * under <mxConstants.SHAPE_IMAGE> in <mxCellRenderer>.
 * 
 * Constructor: mxImageShape
 * 
 * Constructs a new image shape.
 * 
 * Parameters:
 * 
 * bounds - <mxRectangle> that defines the bounds. This is stored in
 * <mxShape.bounds>.
 * image - String that specifies the URL of the image. This is stored in
 * <image>.
 * fill - String that defines the fill color. This is stored in <fill>.
 * stroke - String that defines the stroke color. This is stored in <stroke>.
 * strokewidth - Optional integer that defines the stroke width. Default is
 * 0. This is stored in <strokewidth>.
 */
function mxImageShape(bounds, image, fill, stroke, strokewidth)
{
	mxShape.call(this);
	this.bounds = bounds;
	this.image = image;
	this.fill = fill;
	this.stroke = stroke;
	this.strokewidth = (strokewidth != null) ? strokewidth : 1;
	this.shadow = false;
};

/**
 * Extends mxShape.
 */
mxUtils.extend(mxImageShape, mxRectangleShape);

/**
 * Variable: preserveImageAspect
 *
 * Switch to preserve image aspect. Default is true.
 */
mxImageShape.prototype.preserveImageAspect = true;

/**
 * Function: getSvgScreenOffset
 * 
 * Disables offset in IE9 for crisper image output.
 */
mxImageShape.prototype.getSvgScreenOffset = function()
{
	return 0;
};

/**
 * Function: apply
 * 
 * Overrides <mxShape.apply> to replace the fill and stroke colors with the
 * respective values from <mxConstants.STYLE_IMAGE_BACKGROUND> and
 * <mxConstants.STYLE_IMAGE_BORDER>.
 * 
 * Applies the style of the given <mxCellState> to the shape. This
 * implementation assigns the following styles to local fields:
 * 
 * - <mxConstants.STYLE_IMAGE_BACKGROUND> => fill
 * - <mxConstants.STYLE_IMAGE_BORDER> => stroke
 *
 * Parameters:
 *
 * state - <mxCellState> of the corresponding cell.
 */
mxImageShape.prototype.apply = function(state)
{
	mxShape.prototype.apply.apply(this, arguments);
	
	this.fill = null;
	this.stroke = null;
	this.gradient = null;
	
	if (this.style != null)
	{
		this.preserveImageAspect = mxUtils.getNumber(this.style, mxConstants.STYLE_IMAGE_ASPECT, 1) == 1;
		
		// Legacy support for imageFlipH/V
		this.flipH = this.flipH || mxUtils.getValue(this.style, 'imageFlipH', 0) == 1;
		this.flipV = this.flipV || mxUtils.getValue(this.style, 'imageFlipV', 0) == 1;
	}
};

/**
 * Function: isHtmlAllowed
 * 
 * Returns true if HTML is allowed for this shape. This implementation always
 * returns false.
 */
mxImageShape.prototype.isHtmlAllowed = function()
{
	return !this.preserveImageAspect;
};

/**
 * Function: createHtml
 *
 * Creates and returns the HTML DOM node(s) to represent
 * this shape. This implementation falls back to <createVml>
 * so that the HTML creation is optional.
 */
mxImageShape.prototype.createHtml = function()
{
	var node = document.createElement('div');
	node.style.position = 'absolute';

	return node;
};

/**
 * Function: paintVertexShape
 * 
 * Generic background painting implementation.
 */
mxImageShape.prototype.paintVertexShape = function(c, x, y, w, h)
{
	if (this.image != null)
	{
		var fill = mxUtils.getValue(this.style, mxConstants.STYLE_IMAGE_BACKGROUND, null);
		var stroke = mxUtils.getValue(this.style, mxConstants.STYLE_IMAGE_BORDER, null);
		
		if (fill != null)
		{
			// Stroke rendering required for shadow
			c.setFillColor(fill);
			c.setStrokeColor(stroke);
			c.rect(x, y, w, h);
			c.fillAndStroke();
		}

		// FlipH/V are implicit via mxShape.updateTransform
		c.image(x, y, w, h, this.image, this.preserveImageAspect, false, false);
		
		var stroke = mxUtils.getValue(this.style, mxConstants.STYLE_IMAGE_BORDER, null);
		
		if (stroke != null)
		{
			c.setShadow(false);
			c.setStrokeColor(stroke);
			c.rect(x, y, w, h);
			c.stroke();
		}
	}
	else
	{
		mxRectangleShape.prototype.paintBackground.apply(this, arguments);
	}
};

/**
 * Function: redraw
 * 
 * Overrides <mxShape.redraw> to preserve the aspect ratio of images.
 */
mxImageShape.prototype.redrawHtmlShape = function()
{
	this.node.style.left = Math.round(this.bounds.x) + 'px';
	this.node.style.top = Math.round(this.bounds.y) + 'px';
	this.node.style.width = Math.max(0, Math.round(this.bounds.width)) + 'px';
	this.node.style.height = Math.max(0, Math.round(this.bounds.height)) + 'px';
	this.node.innerHTML = '';

	if (this.image != null)
	{
		var fill = mxUtils.getValue(this.style, mxConstants.STYLE_IMAGE_BACKGROUND, '');
		var stroke = mxUtils.getValue(this.style, mxConstants.STYLE_IMAGE_BORDER, '');
		this.node.style.backgroundColor = fill;
		this.node.style.borderColor = stroke;
		
		// VML image supports PNG in IE6
		var useVml = mxClient.IS_IE6 || ((document.documentMode == null || document.documentMode <= 8) && this.rotation != 0);
		var img = document.createElement((useVml) ? mxClient.VML_PREFIX + ':image' : 'img');
		img.setAttribute('border', '0');
		img.style.position = 'absolute';
		img.src = this.image;

		var filter = (this.opacity < 100) ? 'alpha(opacity=' + this.opacity + ')' : '';
		this.node.style.filter = filter;
		
		if (this.flipH && this.flipV)
		{
			filter += 'progid:DXImageTransform.Microsoft.BasicImage(rotation=2)';
		}
		else if (this.flipH)
		{
			filter += 'progid:DXImageTransform.Microsoft.BasicImage(mirror=1)';
		}
		else if (this.flipV)
		{
			filter += 'progid:DXImageTransform.Microsoft.BasicImage(rotation=2, mirror=1)';
		}

		if (img.style.filter != filter)
		{
			img.style.filter = filter;
		}

		if (img.nodeName == 'image')
		{
			img.style.rotation = this.rotation;
		}
		else if (this.rotation != 0)
		{
			// LATER: Add flipV/H support
			mxUtils.setPrefixedStyle(img.style, 'transform', 'rotate(' + this.rotation + 'deg)');
		}
		else
		{
			mxUtils.setPrefixedStyle(img.style, 'transform', '');
		}

		// Known problem: IE clips top line of image for certain angles
		img.style.width = this.node.style.width;
		img.style.height = this.node.style.height;
		
		this.node.style.backgroundImage = '';
		this.node.appendChild(img);
	}
	else
	{
		this.setTransparentBackgroundImage(this.node);
	}
};