//
// Page-able tabs
//
var tabStart = { };
var tabMax = { };
var tabTransition = { };


function RollTab( tab, delta )
{
	new Effect.Move( $('tab_' + tab + '_items'), {y: -RowHeightForTab( tab ) * delta, afterFinish: TabScrollFinishClosure( tab, delta ) } );
	Effect.ScrollTo( $('tab_' + tab + '_items').up('.tabarea' ), { afterFinish: TabScrollFinishClosure( tab, delta ) } );
}

function TabScrollFinishClosure( tab, delta )
{
	var tab_closure = tab;
	var delta_closure = delta;
	return function() { 
		tabTransition[tab_closure] = false; 
	};
}

function RowHeightForTab( tab )
{
	var tabRow = $('tab_' + tab + '_items' ).down( '.tab_row' );
	return tabRow.getHeight();
}

function TabSelect( elem, target )
{
	$(elem).siblings().invoke( 'removeClassName', 'active')
	$(elem).addClassName( 'active' );
	
	var tab_content = $(target);
	tab_content.siblings().invoke( 'hide' );
	tab_content.show();
}


function ScrollStaticSmallCaps( targetid, delta, pageSize, totalCount )
{
	var elem = $( targetid );
	if ( elem.effect )
		return;
	
	if ( !elem.curPos ) 
	{
		elem.curPos = 0;
	}
	
	elem.curPos += delta;
	
	UpdateSmallCapControl( targetid, delta, pageSize, totalCount );
}

function ScrollCarouselSmallCaps( targetid, delta, pageSize, totalCount )
{
	var elem = $( targetid );
	if ( elem.effect )
		return;
	
	if ( !elem.curPos ) 
	{
		elem.curPos = 0;
	}
	
	elem.curPos += delta;
	
	var max = Math.ceil( totalCount / pageSize ) - 1;

	var nextLink = targetid + '_next';
	var prevLink = targetid + '_prev';
	if ( elem.curPos >= max )
		$(nextLink).addClassName('disabled');
	else 
		$(nextLink).removeClassName('disabled');
	
	if ( elem.curPos <= 0 )
		$(prevLink).addClassName('disabled');
	else
		$(prevLink).removeClassName('disabled');
				
	
	elem.effect = new Effect.Move( elem, {x: -808 * delta, afterFinish: function() { elem.effect = false; }, duration: 0.4 } );

}


function UpdateSmallCapControl( targetid, delta, pageSize, totalCount )
{
	var elem = $( targetid );
	var max = Math.ceil( totalCount / pageSize ) - 1;

	var nextLink = targetid + '_next';
	var prevLink = targetid + '_prev';
	if ( elem.curPos >= max )
		$(nextLink).hide();
	else 
		$(nextLink).show();
	
	if ( elem.curPos <= 0 )
		$(prevLink).hide();
	else
		$(prevLink).show();
	
	var pageStart = elem.curPos * pageSize + 1;
	var pageEnd = pageStart + ( pageSize - 1 );
	$( targetid + '_page_start' ).update( pageStart );
	$( targetid + '_page_end' ).update( Math.min( pageEnd, totalCount ) );
	
	
	elem.effect = new Effect.Move( elem, {x: -614 * delta, afterFinish: function() { elem.effect = false; }, duration: 0.4 } );

}

function ShowWithFade( elem )
{
	var elem = $(elem);

	if ( !elem.visible() || elem.hiding )
	{
		elem.hiding = false;
		if ( elem.effect )
			elem.effect.cancel();
		
		if ( Prototype.Browser.IE )
		{
			elem.addClassName( 'suppress_shadow' );
			elem.effect = new Effect.Appear( elem, { duration: 0.2, afterFinish: function() { elem.removeClassName( 'suppress_shadow' ); } } );
		}
		else
		{
			elem.effect = new Effect.Appear( elem, { duration: 0.2 } );
		}
	}
}

function HideWithFade( elem )
{
	var elem = $(elem);
	
	if ( elem.visible() && !elem.hiding )
	{
		if ( elem.effect && !elem.hiding )
			elem.effect.cancel();
		elem.hiding = true;

		if ( Prototype.Browser.IE )
		{
			elem.addClassName( 'suppress_shadow' );
		}
		elem.effect = new Effect.Fade( elem, { duration: 0.2 } );
	}
}


Event.observe( window, 'load', function() {
	InstrumentLinks();
} );

function InstrumentLinks()
{
	$$('A').each(
		function ( link ) {
			if ( link.bIsInstrumented )
				return;
			
			var navinfo = link.href.match( /[\?&]snr=[^&]*(&|$)/ ); 
			if ( navinfo && !link.href.match( /^javascript/ ) )
			{
				link.bIsInstrumented = true;
				Event.observe( link, 'click', InstrumentedLinkOnClick.bindAsEventListener( null, link ) );
			}
		}
	);
}