var features = {
feature0 : ['boost-speed','disk-defrag'],
feature1 : ['boost-speed','registry-defrag'],
feature2 : ['boost-speed','disk-defrag','registry-defrag','registry-cleaner'],
feature3 : ['boost-speed','registry-cleaner'],
feature4 : ['boost-speed','disk-defrag'],
feature5 : ['boost-speed'],
feature6 : ['emergency-recovery'],
feature7 : ['boost-speed','duplicate-file-finder'],
feature8 : ['boost-speed','task-manager'],
feature9 : ['boost-speed','system-information'],
feature10 : ['boost-speed','emergency-recovery'],
feature11 : ['task-manager'],
feature12 : ['boost-speed'],
feature13 : ['antivirus']};
var products={
	'antivirus':{
		name:'Element Antivirus 2010',
		url:'/en/software/antivirus'},
	'boost-speed':{
		name:'Element BoostSpeed',
		url:'/en/software/boost-speed'},
	'disk-defrag':{
		name:'Element Disk Defrag',
		url:'/en/software/disk-defrag'},
	'disk-defrag-screen-saver':{
		name:'Element Disk Defrag Screen Saver',
		url:'/en/software/disk-defrag-screen-saver'},
	'duplicate-file-finder':{
		name:'Element Duplicate File Finder',
		url:'/en/software/duplicate-file-finder'},
	'emergency-recovery':{
		name:'Element Emergency Recovery',
		url:'/en/software/emergency-recovery'},
	'registry-cleaner':{
		name:'Element Registry Cleaner',
		url:'/en/software/registry-cleaner'},
	'registry-defrag':{
		name:'Element Registry Defrag',
		url:'/en/software/registry-defrag'},
	'system-information':{
		name:'Element System Information',
		url:'/en/software/system-information'},
	'task-manager':{
		name:'Element Task Manager',
		url:'http://www.fileinspect.com/task-manager/'}};
var suggestion_title = 'Suggestions:';
var empty_check ='Please select one or more checkboxes above.';
var all_features	= {};
var checked_features= {};


$(document).ready(function(){
	// setup html
	selector_content	 = "<div id='dark-shadow'></div>"
			+ "<div id='selector-win'>"
			+ "<div id='selector-win-close' style='display: block;'></div>"
			+ "<div id='fancy_bg'>"
			+ "<div class='fancy_bg fancy_bg_n'></div>"
			+ "<div class='fancy_bg fancy_bg_ne'></div>"
			+ "<div class='fancy_bg fancy_bg_e'></div>"
			+ "<div class='fancy_bg fancy_bg_se'></div>"
			+ "<div class='fancy_bg fancy_bg_s'></div>"
			+ "<div class='fancy_bg fancy_bg_sw'></div>"
			+ "<div class='fancy_bg fancy_bg_w'></div>"
			+ "<div class='fancy_bg fancy_bg_nw'></div>"
			+ "</div>"
			+ "<div id='selector-content'>"
			+ "<b class='big'>Element Web Essentials</b>"
			+ "<p>Which features do you want to use?</p>"
			+ "<ul class='product-selector'>"
					+ "<li><input id='feature0' type='checkbox' value='0'/><label FOR='feature0'>Defragment disks</label>"
			+ "</li>"
					+ "<li><input id='feature1' type='checkbox' value='1'/><label FOR='feature1'>Defragment registry</label>"
			+ "</li>"
					+ "<li><input id='feature2' type='checkbox' value='2'/><label FOR='feature2'>Optimize computer</label>"
			+ "</li>"
					+ "<li><input id='feature3' type='checkbox' value='3'/><label FOR='feature3'>Cleanup registry</label>"
			+ "</li>"
					+ "<li><input id='feature4' type='checkbox' value='4'/><label FOR='feature4'>Cleanup disks</label>"
			+ "</li>"
					+ "<li><input id='feature5' type='checkbox' value='5'/><label FOR='feature5'>Erase history</label>"
			+ "</li>"
					+ "<li><input id='feature6' type='checkbox' value='6'/><label FOR='feature6'>Recover files</label>"
			+ "</li>"
					+ "<li><input id='feature7' type='checkbox' value='7'/><label FOR='feature7'>Find duplicate files</label>"
			+ "</li>"
					+ "<li><input id='feature8' type='checkbox' value='8'/><label FOR='feature8'>Control startup programs</label>"
			+ "</li>"
					+ "<li><input id='feature9' type='checkbox' value='9'/><label FOR='feature9'>Display hardware configuration</label>"
			+ "</li>"
					+ "<li><input id='feature10' type='checkbox' value='10'/><label FOR='feature10'>Wipe disks</label>"
			+ "</li>"
					+ "<li><input id='feature11' type='checkbox' value='11'/><label FOR='feature11'>Manage tasks and services</label>"
			+ "</li>"
					+ "<li><input id='feature12' type='checkbox' value='12'/><label FOR='feature12'>Performance tweaks</label>"
			+ "</li>"
					+ "<li><input id='feature13' type='checkbox' value='13'/><label FOR='feature13'>Protect from viruses</label>"
			+ "</li>"
				+ "</ul>"
		+ "<div id='suggestions'></div>"
		+ "</div>"
		+ "<a href='#' class='close'>Close</a>"
		+ "<br class='clear'/>"
		+ "</div>";
	$('body').append(selector_content);
	if ($.fn.pngFix)
	{
		$('#selector-win').pngFix();
	}
	
	// setup window resize and scrolls
	$(window).bind("resize scroll", PS_UpdateOnScroll);
		
	// setup "close" button
	$('#selector-win-close, #selector-win a.close').click(function(){
		PS_Hide();
	});
	
	// setup Product Selector checkboxes
	$('#selector-win ul.product-selector input').click(function(){
		PS_Recalculate();
	});
});

/**
 * Recalculate checkboxes and update "suggestion" div
 *  
 * @return void
 */
function PS_Recalculate()
{
	// get selected checkboxes for each product
	checked_features= PS_SumFeatures( '#selector-win ul.product-selector input:checked' );
	// if checkbox checked
	if ($('#selector-win ul.product-selector input:checked').length == 0)
	{
		$('#selector-win #suggestions').html(empty_check);
		return;
	}
	
	// get products for _all_ checked checkboxes
	// i mean checked_products - products array, wich linked with each checked checkboxes
	suggest_products = PS_Intersect( '#selector-win ul.product-selector input:checked' );
	
	if ( suggest_products.length == 0 || suggest_products[0].length == 0)
	{
		suggest_products = PS_GetTop( '#selector-win ul.product-selector input:checked' );
	}

	// update '#suggestion' div
	PS_PrintFeaturedProducts('#selector-win #suggestions', products, suggest_products );
}

/**
 * Returns count features for every products
 * @example 
 * 	var products = PS_SumFeatures('#selector-win ul.product-selector input:checked') );
 * 	// products now {'boost-speed':2,'disk-defrag':1,'registry-defrag':1}
 * 
 * @param string emelent
 * @return 
 */
function PS_SumFeatures( element )
{
	var result	= {}
	$(element).each(function()
	{
		// features for product
		product_features = features[$(this).attr('id')];
		for (i in product_features)
		{
			product_id = product_features[i];
			if (result[product_id])
				result[product_id]++;
			else
				result[product_id]=1;
		}
	});
	return result;
}
/**
 * Returns product list, with all checked features
 * 
 * @example 
 * products = PS_Intersect('#selector-win ul.product-selector input:checked'); // "elm1" alterted
 *  
 * @param array sets
 * @return array
 */
function PS_Intersect( element )
{
	result	= [];
	featured_products=PS_SumFeatures(element);
	for (i in featured_products)
	{
		if ( featured_products[i]==$(element).length )
			result.push(i);
	}
	result = new Array(result);
	return result;
}
/**
 * @return array
 */
function PS_GetTop( element )
{
	// @example result = [[boost-speed,disk-defrag],[antivirus]]
	result= []; 
	// @example inresult = {'boost-speed':1,'disk-defrag':1}
	inresult = {};
	$(element).each(function()
	{
		// product list with checked feature
		product_features = features[$(this).attr('id')];
		
		// sort array product_features on checked_features, then on all_features
		// if used SQL, then this code equeal query
		// SELECT `product_id` FROM `product_features` ORDER BY `checked_features` DESC,`all_features` DESC
		product_features.sort( PS_Sort );
		// get most "popular" product. 
		product_id = product_features[0];
		if ( !inresult[product_id] )
		{
			inresult[product_id] = 1; 
			result.push([product_id]);
		}
		
	});
	return result;
}
/**
 * Sort array product_features pushing up products with the largest fields `checked_features` and `all_features`
 *
 * @return array
 */
function PS_Sort(a,b)
{
	if ( checked_features[a] > checked_features[b] )
	{
		return -1;
	}
	else if ( checked_features[a] < checked_features[b] )
	{
		return 1;
	}
	else if ( all_features[a] > all_features[b] )
	{
		return -1;
	}
	else if ( all_features[a] < all_features[b] )
	{
		return 1;
	}
	return 0;
}

/**
 * Print product list
 * 
 * @example
 * PS_PrintFeaturedProducts(
 * 		'',
 * 		{'boost-speed':'Element BoostSpeed',
 * 		 'disk-defrag':'Element DiskDefrag',
 * 		 'reg-cleaner':'Element Registry Cleaner'
 * 		},
 * 		['boost-speed','reg-cleaner']
 * ); 
 * 
 * 
 * @param object products - all products
 * @param array featured - array of need products
 * @return array of string
 */
function PS_PrintFeaturedProducts( element, products, featured )
{
	var result_and=new Array();
	for (i in featured )
	{
		result_or = [];
		for (id in featured[i])
		{
			featured_product = products[featured[i][id]];
			if ( featured_product && featured_product.name )
				result_or.push("<a href='"+featured_product.url+"'>" + featured_product.name + "</a>");
		}
		result_and.push(result_or.join(" or "));
	}
	$(element).html( "<b>"+suggestion_title+"</b><br/>" + result_and.join(" and ") );
}


/**
 * On browser window scroll or resize, update "Product Selector" window position
 * 
 * @return void
 */
function PS_UpdateOnScroll()
{
	pos_left = $(window).width()/2 - (  $('#selector-win').width() /2);
	pos_top = $(document).scrollTop() + ( $(window).height()/2 - $('#selector-win').height()/2 );
	$('#selector-win').css('left',pos_left + 'px');
	$('#selector-win').css('top', pos_top  + 'px');
}

/**
 * Show Product Selector window
 * 
 * @return void
 */
function PS_Show()
{
	selector_width	= $('#selector-win').width()
					+ Number($('#selector-win').css('padding-right').replace(/px/,''))
					+ Number($('#selector-win').css('padding-left').replace(/px/,''));
	pos_left = $(window).width()/2 - ( selector_width /2);
	pos_top = $(document).scrollTop() + ( $(window).height()/2 - $('#selector-win').height()/2 );
	$('#selector-win').css('top', pos_top  + 'px');
	$('#selector-win').css('left',pos_left + 'px');
	$('#selector-win').show();
	$('#dark-shadow').show();
	$('select').css('visibility','hidden');
	
	all_features	= PS_SumFeatures( '#selector-win ul.product-selector input' );

	PS_Recalculate();
}

/**
 * Hide Product Selector window
 */
function PS_Hide()
{
	$('#selector-win').hide();
	$('#dark-shadow').hide();
	$('select').css('visibility','visible');
}


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