//
//	Copyright 2003 Point2 Technologies, Inc.
//
//	Developer: Colin Bendell
//
//	Description:
//     Inserts css page breaks based on the content being rendered.  The behavior
//     traverses the document objects and looks for table entries.  Each table is understood
//     to be a set of pages with a head and footer and the rows are the allowable page break
//     delimiters.  Each table will force a page break at the end to prepare for the next table
//     block.
//

    var PAGE_HEIGHT_OFFSET_PX = 11; //hack - print setup has a header and footer that factor into the calculation by 11 pixels
    var PAGE_HEIGHT = 11;
    var PAGE_WIDTH = 8.5;
    var PAGE_LEFT_MARGIN = 1;
    var PAGE_RIGHT_MARGIN = 1;
    var PAGE_TOP_MARGIN = 1;
    var PAGE_BOTTOM_MARGIN = .5;
    var DPI = 96;

    /**
     * Determines if the document is ready for page breaks to be calculated
     * then performs the page break calculations
     *
     * @param htmlObj the document to calculate the children.  By default
     * this is the body element.  Overload this method to calculate breaks
     * within another html element such as a div
     */
    function calculateBreaks(htmlObj, breakRows)
    {
	if (breakRows == null)
	{
	    breakRows = true;
        }
        if (htmlObj == null)
        {
            //htmlObj = ownerDocument.body;
			htmlObj = parent.document.body;
        }
        var img;
        //for (var i=0; i < ownerDocument.images.length; i++)
		for (var i=0; i < parent.document.images.length; i++)
        {
            //img = ownerDocument.images(i);
			img = parent.document.images(i);
            if (img.complete != true)
            {
                setTimeout(this.uniqueID + ".calculateBreaks(" + htmlObj.uniqueID + ")", 500);
                return;
            }
        }

        // first we calculate the height and width
        var calcHeight = Math.round((PAGE_HEIGHT - PAGE_TOP_MARGIN - PAGE_BOTTOM_MARGIN) * DPI) - PAGE_HEIGHT_OFFSET_PX;
        var calcWidth = Math.round((PAGE_WIDTH - PAGE_LEFT_MARGIN - PAGE_RIGHT_MARGIN) * DPI);

        var baseHeight;
        var segmentHeight;
        var tBody;
        var tBodyIndex;
        var row;
        var rowIndex;

        htmlObj = htmlObj.firstChild;
        while (htmlObj)
        {
            if (htmlObj.tagName == 'TABLE') 
	    {	
                baseHeight = 0;
                if (htmlObj.tHead != null)
                {
                    baseHeight = baseHeight + htmlObj.tHead.offsetHeight;
                    htmlObj.tHead.style.display = "table-header-group";
                }
                if (htmlObj.tFoot != null)
                {
                    baseHeight = baseHeight + htmlObj.tFoot.offsetHeight;
                    htmlObj.tFoot.style.display = "table-footer-group";
                }
                segmentHeight = baseHeight;
                //page break before
				if( htmlObj.previousSibling != null )
				{
					htmlObj.style.pageBreakBefore = "always";
				}
                // set the width to fit the page
                htmlObj.width = calcWidth;
		if (breakRows)
                {
                   for (tBodyIndex = 0; tBodyIndex < htmlObj.tBodies.length; tBodyIndex++)
                   {
                       tBody = htmlObj.tBodies[tBodyIndex];
                       for (rowIndex = 0; rowIndex < tBody.rows.length; rowIndex++)
                       {
                           row = tBody.rows[rowIndex];
                           if ((segmentHeight = segmentHeight + row.offsetHeight) > calcHeight)
                           {
                               row.style.pageBreakBefore = "always";
                               row.style.borderTop = "solid 1px black";
                               segmentHeight = row.offsetHeight + baseHeight;
                           }
                       }
                   }
		}
	    }
            htmlObj = htmlObj.nextSibling;
        }
    }