/*
	 *	jquery.suggest 1.1 - 2007-08-06
	 *	
	 *	Uses code and techniques from following libraries:
	 *	1. http://www.dyve.net/jquery/?autocomplete
	 *	2. http://dev.jquery.com/browser/trunk/plugins/interface/iautocompleter.js	
	 *
	 *	All the new stuff written by Peter Vulgaris (www.vulgarisoip.com)	
	 *	Feel free to do whatever you want with this file
	 *
	 */
	
	(function($){
		$.scribsuggest = function(input, options){
	
			var $input = $(input).attr("autocomplete", "off");
			var $results = $(document.createElement("ul"));

			var timeout = false;		// hold timeout ID for suggestion results to appear	
			var prevLength = 0;			// last recorded length of $input.val()
			var cache = [];				// cache MRU list
			var cacheSize = 0;			// size of cache in chars (bytes?)

			$results.addClass(options.resultsClass).appendTo('body');

			resetPosition();
			$(window)
				.load(resetPosition)		// just in case user is changing size of page while loading
				.resize(resetPosition);

			$input.blur(function(){
				setTimeout(function(){ $results.hide() }, 200);
			});

			// help IE users if possible
			try{
				$results.bgiframe();
			} catch(e){ }

			// I really hate browser detection, but I don't see any other way
			if($.browser.mozilla)
				$input.keypress(processKey);	// onkeypress repeats arrow keys in Mozilla/Opera
			else
				$input.keydown(processKey);		// onkeydown repeats arrow keys in IE/Safari

			function resetPosition(){
				// requires jquery.dimension plugin
				var offset = $input.offset();
				$results.css({
					top: (offset.top + input.offsetHeight) + 'px',
					left: offset.left + 'px'
				});
			}

			function processKey(e){
				// handling up/down/escape requires results to be visible
				// handling enter/tab requires that AND a result to be selected
				if((/27$|38$|40$/.test(e.keyCode) && $results.is(':visible')) ||
					(/^13$|^9$/.test(e.keyCode) && getCurrentResult())){
		            
		            if(e.preventDefault)
		                e.preventDefault();
					if(e.stopPropagation)
		                e.stopPropagation();

	                e.cancelBubble = true;
	                e.returnValue = false;
				
					switch(e.keyCode){
						case 38: // up
							prevResult();
							break;
				
						case 40: // down
							nextResult();
							break;
	
						case 9:  // tab
						case 13: // return
							selectCurrentResult();
							break;
							
						case 27: //	escape
							$results.hide();
							break;
					}					
				}else if($input.val().length != prevLength){
					if(timeout) 
						clearTimeout(timeout);
					timeout = setTimeout(suggest, options.delay);
					prevLength = $input.val().length;
				}
			}

			function suggest(){
				var q = $.trim($input.val());
				if(q.length >= options.minchars){
					cached = checkCache(q);
					if(cached){
						displayItems(cached['items']);
					}else{
						$.get(options.source, {q: q}, function(txt){
							$results.hide();
							var items = parseTxt(txt, q);
							displayItems(items);
							addToCache(q, items, txt.length);
						});	
					}
				}else{
					$results.hide();
				}
			}

			function checkCache(q){
				for(var i = 0; i < cache.length; i++)
					if(cache[i]['q'] == q){
						cache.unshift(cache.splice(i, 1)[0]);
						return cache[0];
					}
				return false;
			}

			function addToCache(q, items, size){
				while(cache.length && (cacheSize + size > options.maxCacheSize)){
					var cached = cache.pop();
					cacheSize -= cached['size'];
				}
				cache.push({
					q: q,
					size: size,
					items: items
				});
				cacheSize += size;
			}

			function displayItems(items){
				if(!items) return;
				if(!items.length){
					$results.hide();
					return;
				}
				var html = '';
				for(var i = 0; i < items.length; i++) html += '<li>' + items[i] + '</li>';

				$results.html(html).show();
				$results
					.children('li')
					.mouseover(function(){
						$results.children('li').removeClass(options.selectClass);
						$(this).addClass(options.selectClass);
					})
					.click(function(e){
						e.preventDefault(); 
						e.stopPropagation();
						selectCurrentResult();
					});
			}
			
			function parseTxt(txt, q){
				var items = [];
				var tokens = txt.split(options.delimiter);

				// parse returned data for non-empty items
				for(var i = 0; i < tokens.length; i++){
					var token = $.trim(tokens[i]);
					if(token){
/* removed because it breaks the a links in the output from Scriblio
						token = token.replace(
							new RegExp(q, 'ig'), 
							function(q){ return '<span class="' + options.matchClass + '">' + q + '</span>' }
							);
*/
						items[items.length] = token;
					}
				}

				return items;
			}

			function getCurrentResult(){
				if(!$results.is(':visible')) return false;			
				var $currentResult = $results.children('li.' + options.selectClass);
				if(!$currentResult.length)
					$currentResult = false;
					
				return $currentResult;
			}

			function selectCurrentResult(){
				$currentResult = getCurrentResult();

// added for Scriblio
				if($currentResult.children('a').attr('href')){
					document.location = $currentResult.children('a').attr('href');
					$input.val($currentResult.children('a').text());
				}

/* removed for Scriblio
				if($currentResult){
					$input.val($currentResult.text());
					$results.hide();
					
					if(options.onSelect)
						options.onSelect.apply($input[0]);
				}
*/
			}

			function nextResult(){
				$currentResult = getCurrentResult();
			
				if($currentResult)
					$currentResult
						.removeClass(options.selectClass)
						.next()
							.addClass(options.selectClass);
				else
					$results.children('li:first-child').addClass(options.selectClass);
			}

			function prevResult(){
				$currentResult = getCurrentResult();

				if($currentResult)
					$currentResult
						.removeClass(options.selectClass)
						.prev()
							.addClass(options.selectClass);
				else
					$results.children('li:last-child').addClass(options.selectClass);
			}
		}

		$.fn.scribsuggest = function(source, options){
			if(!source) return;

			options = options || {};
			options.source = source;
			options.delay = options.delay || 300;
			options.resultsClass = options.resultsClass || 'scrib_suggest_results';
			options.selectClass = options.selectClass || 'scrib_suggest_over';
			options.matchClass = options.matchClass || 'scrib_suggest_match';
			options.minchars = options.minchars || 3;
			options.delimiter = options.delimiter || '\n';
			options.onSelect = options.onSelect || false;
			options.maxCacheSize = options.maxCacheSize || 65536;

			this.each(function(){
				new $.scribsuggest(this, options);
			});
			return this;
		};
	})(jQuery);