/*
 *	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 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 || ( $input.val().length + prevLength == 0 )){

                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 {
                    var processRes = function(txt) {
                        $results.hide();
                        var items = parseTxt(txt, q);
                        displayItems(items);
                        addToCache(q, items, txt.length);
                    }

                    if ( typeof options.source == 'function' || typeof options.source == 'object' ) {                        
                        processRes (options.source(q));
                    } else {
                        $.get(options.source, {
                            q: q
                        }, processRes);
                    }			
                }		
            } 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();
            resetPosition();
            $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) {
                    token = token.replace(
                        new RegExp(q, 'ig'),
                        function(q) {
                            return q;
                        }//'<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());
                $results.hide();
                if (options.onSelect){
                    if(options.onSelectRaw){
                        options.onSelect($currentResult.html());
                    }else{
                        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.onSelectRaw = options.onSelectRaw || false;
        options.maxCacheSize = options.maxCacheSize || 65536;
	
        this.each(function() {
            new $.suggest(this, options);
        });
	
        return this;
			
    };
		
})(jQuery);