/**
 * nav.js
 *
 * This script contains functions for properly rendering
 * navigation state for the site's top level nav.
 */

/**
 * Redirect to a relative URL on a new host IF the required hostname is present
 */
function redirectHost(requiredHostname,targetHostname) {
	if (document.location.host.indexOf(requiredHostname) != -1) {
		var l = document.location;
		var url = l.protocol + "//" + targetHostname + l.pathname;
		if (l.hash) url += l.hash;
		if (l.search) url += l.search;
		document.location = url;
	}
}

/**
 * Redirect to an HTTPS url if you match the current hostname
 * @param requiredHostname
 * @return
 */
function redirectSSL(requiredHostname,targetHostname) {
	var l = document.location;
	if (l.host.indexOf(requiredHostname) != -1) {
		if (l.protocol.indexOf("http:") != -1) {
		  var host = targetHostname == undefined?l.host:targetHostname;
			var url = "https://" + host + l.pathname;
			if (l.hash) url += l.hash;
			if (l.search) url += l.search;
			document.location = url;
		}
	}
}
/**
 * Returns just the resource portion of the URL
 */
function getResourceName() {
	var file_name = document.location.href;
	var end = (file_name.indexOf("?") == -1) ? file_name.length : file_name.indexOf("?");
	end = (file_name.indexOf("#") == -1)?end:file_name.indexOf("#"); // chop anchors too
	return file_name.substring(file_name.lastIndexOf("/")+1, end);
}

/**
 * Selected nav items are set by matching 
 * the start of the resource with the nav item.
 * For example, anything starting with 'download' will match
 * the nav item 'download'.
 */
function initNav() {
	var resourceName = getResourceName();
	$("#nav").find("a").each(
		function() {
			// Toggle selected state
			if (resourceName.indexOf(this.id) == 0) { // starts with id anchor
				$("#" + this.id).parent("li").addClass("selected"); 
			}
		}
	);
	
	// Assign click support
	// Assign hover support
	$("#nav > ul > li").each(
		function() {
			var anchor = $(this).find("a:first");
			setNavItemClick(this,anchor);
			setNavItemHover(this);
		}
	);
	// Assign home click support
	setNavItemClick( $("#home") );
	
	// Customize search box for safari
	if ($.browser.safari) {
		$("#search-input").attr("results","5");
	}
}

/**
 * Selected menu items are set by matching resource 
 */
function initMenu() {
	var resourceName = getResourceName();
	var el = $(".menu").find("a[href='" + resourceName +"']:first");
	if (el) { // match the element whose href is the current document
		el.parent("li").addClass("selected");
	}

	// Add hover support
	// Add click 'anywhere support
	$(".menu").find("li").each(
		function() {
			var anchor=$(this).find("a:first");		
			$(this).hover(
				function() { $(this).addClass("hover"); anchor.addClass("hover"); },
				function() { $(this).removeClass("hover"); anchor.removeClass("hover"); }
			);
			setNavItemClick(this,anchor);
		}
	);
}

/**
 * Set an item click to the same href as an anchor
 */
function setNavItemClick(item, anchor) {
	var href = anchor == undefined?"index.html":$(anchor).attr("href");
	$(item).click(
		function() { top.location.href=href; }
	);	
}

/**
 * Assign a hover over effect for list items
 */
function setNavItemHover(item) {
	if (!$(item).hasClass("selected")) {
		$(item).hover(
			function() { $(item).addClass("hover");},
			function() { $(item).removeClass("hover");}
		);
	}
}

// Browser validation code - Jquery 1.2.x does *not* work in Safari 2 or older!!!
//alert($.browser.safari + $.browser.version);
if ($.browser.safari && $.browser.version < 522) {
	top.location.href="incompatible.html";
}