/*
	 *	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 = false;		// hold timeout ID for suggestion results to appear	
			var pq = $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

			timeout = setInterval(suggest, options.delay);

			function resetPosition() {
				// requires jquery.dimension plugin
				var offset = $input.offset();
				var width = $input.width();
				if($.browser.msie)
					width += 2;
				else if($.browser.mozilla)
					width += 1;
				
				$results.css({
					width: (width+10)  + 'px',
					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 cached = false;
				var q = $.trim($input.val());
				if(q == pq)
					return ;
				
				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();
				}
				pq = q;
			}
			
			
			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 = '';
				html += '<div style="text-align:right;padding-right:7px;margin-bottom:3px;cursor:pointer;text-decoration:underline;color:#2E9CD0" id="closesuggest">關閉</div>';
				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();
					});
				$('#closesuggest').click(function(){
					$results.hide();
				});
							
			}
			
			
			/**********************************************************************
			IN:
				NUM - the number to format
				decimalNum - the number of decimal places to format the number to
				bolLeadingZero - true / false - display a leading zero for
												numbers between -1 and 1
				bolParens - true / false - use parenthesis around negative numbers
				bolCommas - put commas as number separators.
 
			RETVAL:
				The formatted number!
 			**********************************************************************/
			function FormatNumber(num,decimalNum,bolLeadingZero,bolParens,bolCommas)
			{ 
                if (isNaN(parseInt(num))) return "NaN";
        
				var tmpNum = num;
				var iSign = num < 0 ? -1 : 1;		// Get sign of number
			
				// Adjust number so only the specified number of numbers after
				// the decimal point are shown.
				tmpNum *= Math.pow(10,decimalNum);
				tmpNum = Math.round(Math.abs(tmpNum))
				tmpNum /= Math.pow(10,decimalNum);
				tmpNum *= iSign;					// Readjust for sign
			
			
				// Create a string object to do our formatting on
				var tmpNumStr = new String(tmpNum);
        
				// See if we need to strip out the leading zero or not.
				if (!bolLeadingZero && num < 1 && num > -1 && num != 0)
					if (num > 0)
						tmpNumStr = tmpNumStr.substring(1,tmpNumStr.length);
					else
						tmpNumStr = "-" + tmpNumStr.substring(2,tmpNumStr.length);
				
				// See if we need to put in the commas
				if (bolCommas && (num >= 1000 || num <= -1000)) {
					var iStart = tmpNumStr.indexOf(".");
					if (iStart < 0)
						iStart = tmpNumStr.length;
        
					iStart -= 3;
					while (iStart >= 1) {
						tmpNumStr = tmpNumStr.substring(0,iStart) + "," + tmpNumStr.substring(iStart,tmpNumStr.length)
						iStart -= 3;
					}		
				}
			
				// See if we need to use parenthesis
				if (bolParens && num < 0)
					tmpNumStr = "(" + tmpNumStr.substring(1,tmpNumStr.length) + ")";
			
				return tmpNumStr;		// Return our formatted string!
			}
			
			function parseNumberString(num)
			{
				return FormatNumber(num, 10, false, false, true);
			}
			
			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) {
						var hintspos = token.lastIndexOf(':');
						var countpos = token.lastIndexOf(':', hintspos-1);
						var hints = token.substring(hintspos+1);
						var count = token.substring(countpos+1, hintspos);
						var token = token.substring(0, countpos);
						var text = token;
						token = token.replace(
							new RegExp(q, 'ig'), 
							function(q) { return '<span class="' + options.matchClass + '">' + q + '</span>' }
							);
						token = '<tr class="ac_tr"><td class="ac_td1">' + token + '</td>';
						if(hints != "")
							token += '<td class="ac_td2 ' + options.hitsClass + '">' + parseNumberString(hints) + ' 次</td>';
						if(count != "")
							token += '<td class="ac_td2 ' + options.countClass + '">' + parseNumberString(count) + ' 結果</td>';
						token += '</tr>';
						token = '<div class="ac_text">' + text + '</div><table class="ac_table">' + token + '</table>';
						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.children('.ac_text').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.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.countClass = options.countClass || 'ac_count';
			options.hitsClass = options.hitsClass || 'ac_hints';
			options.michars = options.minchars || 2;
			options.delimiter = options.delimiter || '\n';
			options.onSelect = options.onSelect || false;
			options.maxCacheSize = options.maxCacheSize || 65536;

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