/***
@title:
Live Search

@version:
2.0

@author:
Andreas Lagerkvist

@date:
2008-08-31

@url:
http://andreaslagerkvist.com/jquery/live-search/

@license:
http://creativecommons.org/licenses/by/3.0/

@copyright:
2008 Andreas Lagerkvist (andreaslagerkvist.com), changes myde by VonWilmowsky 

@requires:
jquery, jquery.liveSearch.css

@does:
Use this plug-in to turn a normal form-input in to a live ajax search widget. The plug-in displays any HTML you like in the results and the search-results are updated live as the user types.

@howto:
jQuery('#q').liveSearch({url: '/ajax/search.php?q='}); would add the live-search container next to the input#q element and fill it with the contents of /ajax/search.php?q=THE-INPUTS-VALUE onkeyup of the input.

@exampleHTML:
<form method="post" action="/search/">

	<p>
		<label>
			Enter search terms<br />
			<input type="text" name="q" />
		</label> <input type="submit" value="Go" />
	</p>

</form>

@exampleJS:
jQuery('#jquery-live-search-example input[name="q"]').liveSearch({url: Router.urlForModule('SearchResults') + '&q='});
***/

jQuery.fn.liveSearch = function (conf) {
	var config = jQuery.extend({
		url:			'/search-results.php?q=', 
		id:				'jquery-live-search', 
		duration:		400, 
		typeDelay:		200,
		loadingClass:	'loading', 
		onSlideUp:		function () {}, 
		uptadePosition:	false
	}, conf);

	var liveSearch	= jQuery('#' + config.id);
	
	var selectionIndex = -1;
	var selectables = null;

	// Create live-search if it doesn't exist
	if (!liveSearch.length) {
		liveSearch = jQuery('<div id="' + config.id + '"></div>')
						.appendTo(document.body)
						.hide()
						.slideUp(0);

		// Close live-search when clicking outside it
		jQuery(document.body).click(function(event) {
			var clicked = jQuery(event.target);

			if (!(clicked.is('#' + config.id) || clicked.parents('#' + config.id).length || clicked.is('input'))) {
				liveSearch.slideUp(config.duration, function () {
					config.onSlideUp();
				});
			}
		});
	}

	return this.each(function () {
		var input							= jQuery(this).attr('autocomplete', 'off');
		var liveSearchPaddingBorderHoriz	= parseInt(liveSearch.css('paddingLeft'), 10) + parseInt(liveSearch.css('paddingRight'), 10) + parseInt(liveSearch.css('borderLeftWidth'), 10) + parseInt(liveSearch.css('borderRightWidth'), 10);

		// Re calculates live search's position
		var repositionLiveSearch = function () {
			var tmpOffset	= input.offset();
			var inputDim	= {
				left:		tmpOffset.left, 
				top:		tmpOffset.top, 
				width:		input.outerWidth(), 
				height:		input.outerHeight()
			};

			inputDim.topPos		= inputDim.top + inputDim.height;
			inputDim.totalWidth	= inputDim.width - liveSearchPaddingBorderHoriz;

			liveSearch.css({
				position:	'absolute', 
				left:		inputDim.left + 'px', 
				top:		inputDim.topPos + 'px',
				width:		inputDim.totalWidth + 100 + 'px' //change width of suggestion box here
			});
		};

		// Shows live-search for this input
		var showLiveSearch = function () {
			// Always reposition the live-search every time it is shown
			// in case user has resized browser-window or zoomed in or whatever
			repositionLiveSearch();

			// We need to bind a resize-event every time live search is shown
			// so it resizes based on the correct input element
			jQuery(window).unbind('resize', repositionLiveSearch);
			jQuery(window).bind('resize', repositionLiveSearch);

			liveSearch.slideDown(config.duration);
		};

		// Hides live-search for this input
		var hideLiveSearch = function () {
			liveSearch.slideUp(config.duration, function () {
				config.onSlideUp();
			});
		};
		
		var loadSelectables = function() {
			selectables = jQuery('#jquery-live-search .selectable');
	        selectables.mouseover(function(ev) {
	        	selectionIndex = selectables.index(this);
	            selectSelectable();
	        });
		};
	
		var selectSelectable = function() {
        	selectables.removeClass("selectedSuggestion");
        	selectables.eq(selectionIndex).addClass("selectedSuggestion");
		};
	
		var hide = function() {
			selectedIndex = -1;
			liveSearch.slideUp(config.duration, function () {
					config.onSlideUp();
			});	
		};
	
		var selectResult = function() {
			if (selectionIndex == -1 || selectionIndex == selectables.length - 1) {
	            // form submit
				jQuery.post("http://www.vonwilmowsky.com/search_request_log.php", { keyphrase: jQuery.trim(jQuery('#inputString').val()), searchTerm: jQuery.trim(jQuery('#inputString').val())});
	            document.forms.advanced_search.submit();
	        } else {
				var destination = selectables.eq(selectionIndex).children("a").attr("href");
				if(destination==null) //workaround in case a whole <tr> is selectable
					destination = selectables.eq(selectionIndex).children("td").children("a").attr("href");
				
				//log search term and selected keyphrase
				jQuery.post("http://www.vonwilmowsky.com/search_request_log.php", { keyphrase: jQuery.trim(selectables.eq(selectionIndex).text()), searchTerm: jQuery.trim(jQuery('#inputString').val(), function(xml) {alert(xml);})} );
				//alert("log keyphrase: " + jQuery.trim(selectables.eq(selectionIndex).text()) + ", searchTerm: " + jQuery.trim(jQuery('#inputString').val()));
	            window.location.href = destination;
	        }
		};

		input
			// On focus, if the live-search is empty, perform an new search
			// If not, just slide it down. Only do this if there's something in the input
			.focus(function () {
				if (this.value !== '') {
					// Perform a new search if there are no search results
					if (liveSearch.html() == '') {
						this.lastValue = '';
						input.keyup();
					}
					// If there are search results show live search
					else {
						// HACK: In case search field changes width onfocus
						setTimeout(showLiveSearch, 1);
					}
				}
			})
			// Auto update live-search onkeyup
			.keyup(function (ev) {
				
				//evaluate keys
				var code = (ev.keycode ? ev.keycode : ev.which);
				//TODO: adjust code
				 switch (code) {
		            case(38): // UP
		                if (selectionIndex == 0 || selectionIndex == -1) {
		                    selectionIndex = selectables.length - 1;
		                } else {
		                    selectionIndex--;
		                }
		               	selectSelectable();
		                break;
		            case(40): // DOWN
		                selectionIndex++;
		                if (selectionIndex == selectables.length) {
		                    selectionIndex = 0;
		                }
		                selectSelectable();
		                break;
		            case(27): // ESC
		                hide();
		                break;
		            case(13): // RETURN
		                selectResult();
		                break;
		            //default:
		                //checkQuery();
        }
				
				
				// Don't update live-search if it's got the same value as last time
				if (this.value != this.lastValue) {
					input.addClass(config.loadingClass);

					var q = this.value;

					// Stop previous ajax-request
					if (this.timer) {
						clearTimeout(this.timer);
					}

					// Start a new ajax-request in X ms
					this.timer = setTimeout(function () {
						jQuery.get(config.url + q, function (data) {
							input.removeClass(config.loadingClass);

							// Show live-search if results and search-term aren't empty
							if (data.length && q.length) {
								liveSearch.html(data);
								loadSelectables();
								showLiveSearch();
							}
							else {
								hideLiveSearch();
							}
						});
					}, config.typeDelay);

					this.lastValue = this.value;
				}
			});
	});
};