(function($) {

    $.suggest = function(input, options) {

        var $input = $(input).attr("autocomplete", "off");
        var $results;

        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?)

        if ($.trim($input.val()) == '' || $.trim($input.val()) == '中文/拼音') $input.val('中文/拼音').css('color', '#aaa');
        if (!options.attachObject)
            options.attachObject = $(document.createElement("ul")).appendTo('body');

        $results = $(options.attachObject);
        $results.addClass(options.resultsClass);

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

        $input.blur(function() {
            setTimeout(function() { $results.hide() }, 1000);
        });

        $input.focus(function() {
            if ($.trim($(this).val()) == '中文/拼音') {
                $(this).val('').css('color', '#000');
            }
            if ($.trim($(this).val()) == '') {
                displayItems(''); //显示热门城市列表
            }
        });
        $input.click(function() {
            var q = $.trim($(this).val());
            displayItems(q);
            $(this).select();
        });

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

        $input.keyup(processKey); //

        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 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());
            displayItems(q);
        }
        //当前items测试过是输入框内容
        function displayItems(items) {
            var html = '';
            if (items == '') {//热门城市遍历
                for (h in options.hot_list) {
                    html += '<li rel="' + options.hot_list[h][0] + '"><a href="#' + h + '"><span>' + options.hot_list[h][2] + '</span>' + options.hot_list[h][1] + '</a></li>';
                }
                html = '<div class="gray ac_result_tip">请输入中文/拼音或者↑↓选择</div><ul>' + html + '</ul>';
            }
            else {

                /*if (!items)
                return;
                if (!items.length) {
                $results.hide();
                return;
                }*/

                var kwStr = '';

                $.get(options.keywordURL + "?k=" + encodeURI(items), function(data) {//回传的数据类型

                    var rows = data.split('\n');

                    var keywords = new Array();
                    for (var i = 0; i < rows.length-1; i++) {
                        keywords[i] = new Array(rows[i].split('\t')[0], rows[i].split('\t')[1], rows[i].split('\t')[2], rows[i].split('\t')[3]);
                    }


                    options.source = keywords;
                    for (var i = 0; i < options.source.length; i++) {//国内城市匹配
                        var reg = new RegExp('^.*' + items + '.*$', 'im');
                        if (reg.test(options.source[i][0]) || reg.test(options.source[i][1]) || reg.test(options.source[i][2]) || reg.test(options.source[i][3])) {
                            html += '<li rel="' + options.source[i][0] + '"><a href="#' + i + '">' + options.source[i][1] + '</a></li>';
                        }
                    }
                    //                    if (html == '') {
                    //                        suggest_tip = '<div class="gray ac_result_tip">对不起，找不到：' + items + '</div>';
                    //                    }
                    //                    else {
                    //                        suggest_tip = '<div class="gray ac_result_tip">' + items + '，按拼音排序</div>';
                    //                    }
                    suggest_tip = '';
                    html = suggest_tip + '<ul>' + html + '</ul>';


                    $results.html(html).show();
                    $results.children('ul').children('li:first-child').addClass(options.selectClass);

                    $results.children('ul')
					.children('li')
					.mouseover(function() {
					    $results.children('ul').children('li').removeClass(options.selectClass);
					    $(this).addClass(options.selectClass);
					})
					.click(function(e) {
					    e.preventDefault();
					    e.stopPropagation();
					    selectCurrentResult();
					});

                });


            }


        }

        function getCurrentResult() {

            if (!$results.is(':visible'))
                return false;

            var $currentResult = $results.children('ul').children('li.' + options.selectClass);
            if (!$currentResult.length)
                $currentResult = false;

            return $currentResult;

        }

        function selectCurrentResult() {

            $currentResult = getCurrentResult();

            if ($currentResult) {
                $input.val($currentResult.children('a').html().replace(/<span>.+?<\/span>/i, ''));
                $results.hide();

                if ($(options.dataContainer)) {
                    $(options.dataContainer).val($currentResult.attr('rel'));
                }

                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('ul').children('li:first-child').addClass(options.selectClass);

        }

        function prevResult() {

            $currentResult = getCurrentResult();

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

        }

    }

    $.fn.suggest = function(source, options) {

        if (!source)
            return;

        options = options || {};
        options.source = source;
        options.hot_list = options.hot_list || [];
        options.delay = options.delay || 0;
        options.resultsClass = options.resultsClass || 'ac_results';
        options.selectClass = options.selectClass || 'ac_over';
        options.matchClass = options.matchClass || 'ac_match';
        options.minchars = options.minchars || 1;
        options.delimiter = options.delimiter || '\n';
        options.onSelect = options.onSelect || false;
        options.dataDelimiter = options.dataDelimiter || '\t';
        options.dataContainer = options.dataContainer || '#SuggestResult';
        options.attachObject = options.attachObject || null;
        options.keywordURL = options.keywordURL || null;
        this.each(function() {
            new $.suggest(this, options);
        });

        return this;

    };

})(jQuery);