// Tabs on userpage

var userpage_blocks = [];

var userpage_onload = function()
{
	var wrapper = document.getElementById('userpage_wrap');
	var links = document.getElementById('userpage_links');
	
	if ( !wrapper )
		return false;
	
	wrapper.className = 'userpage_wrap';
	links.className = 'userpage_links';
	
	var blocks = wrapper.getElementsByTagName('div');
	var first_block = false;
	for ( var i = 0; i < blocks.length; i++ )
	{
		var block = blocks[i];
		if ( /^tab:/.test(block.id) )
		{
			$dynano(block).addClass('userpage_block');
			var block_id = block.id.substr(4);
			userpage_blocks.push(block_id);
			if ( !first_block )
			{
				// this is the first block on the page, memorize it
				first_block = block_id;
			}
		}
	}
	// init links
	var as = links.getElementsByTagName('a');
	for ( var i = 0; i < as.length; i++ )
	{
		var a = as[i];
		if ( a.href.indexOf('#') > -1 )
		{
			var hash = a.href.substr(a.href.indexOf('#'));
			var blockid = hash.substr(5);
			a.blockid = blockid;
			a.onclick = function()
			{
				userpage_select_block(this.blockid);
				return false;
			}
			a.id = 'userpage_blocklink_' + blockid;
		}
	}
	if ( $_REQUEST['tab'] )
	{
		userpage_select_block($_REQUEST['tab'], true);
	}
	else
	{
		userpage_select_block(first_block, true);
	}
}

addOnloadHook(userpage_onload);

/**
 * Select (show) the specified block on the userpage.
 * @param string block name
 * @param bool If true, omits transition effects.
 */

function userpage_select_block(block, nofade)
{
	// memorize existing scroll position, reset the hash, then scroll back to where we were
	// a little hackish and might cause a flash, but it's better than hiding the tabs on each click
	var currentScroll = getScrollOffset();
	
	var current_block = false;
	nofade = true;
	for ( var i = 0; i < userpage_blocks.length; i++ )
	{
		var div = document.getElementById('tab:' + userpage_blocks[i]);
		if ( div )
		{
			if ( div.style.display != 'none' )
			{
				current_block = userpage_blocks[i];
				if ( nofade || aclDisableTransitionFX )
				{
					div.style.display = 'none';
				}
			}
		}
		var a = document.getElementById('userpage_blocklink_' + userpage_blocks[i]);
		if ( a )
		{
			if ( $dynano(a.parentNode).hasClass('userpage_tab_active') )
			{
				$dynano(a.parentNode).rmClass('userpage_tab_active');
			}
		}
	}
	if ( nofade || !current_block || aclDisableTransitionFX )
	{
		var div = document.getElementById('tab:' + block);
		div.style.display = 'block';
	}
	else
	{
		// DISABLED: see "nofade = true;" above.
		// do this in a slightly fancier fashion
		load_component(['jquery', 'jquery-ui']);
		$('#tab:' + current_block).hide("blind", {}, 500, function()
		{
			$('#tab:' + block).show("blind", {}, 500);
		});
	}
	var a = document.getElementById('userpage_blocklink_' + block);
	$dynano(a.parentNode).addClass('userpage_tab_active');
	
	window.location.hash = 'tab:' + block;
	setScrollOffset(currentScroll);
}