/*
 *	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($) {
	$.suggest = function(input, options) {
		var $input = $(input).attr("autocomplete", "off");
		var $results = $(document.createElement("ul"));
		var timeout = 0;		// 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();
				});
			nextResult();
		}
		
		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){
/*  						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() {
			$currentResult = getCurrentResult();
			if ($currentResult) {
				$input.val($currentResult.text());
				if(options.followLinks && $('a', $currentResult).attr('href')){
					document.location = $('a', $currentResult).attr('href');
				}
				$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.suggest = function(source, options) {
		if (!source) return;
		options = options || {};
		options.source = source;
		options.delay = options.delay || 100;
		options.resultsClass = options.resultsClass || 'ac_results';
		options.selectClass = options.selectClass || 'ac_over';
		options.matchClass = options.matchClass || 'ac_match';
		options.minchars = options.minchars || 2;
		options.delimiter = options.delimiter || '\n';
		options.onSelect = options.onSelect || false;
		options.maxCacheSize = options.maxCacheSize || 65536;
		options.followLinks = options.followLinks || false;
		this.each(function() {
			new $.suggest(this, options);
		});
		return this;
	};
	
})(jQuery);