/**
* jQuery Autocomplete Mod
* This is modification of Dylan Verheul's jQuery Autcomplete plug-in. I customized his library adding the features I needed and fixing issues I considered bugs. 
* http://www.pengoworks.com/workshop/jquery/autocomplete.htm
* Fixed by Json Lee 2007-12-11
* http://huacn.cnblogs.com
*/
jQuery.autocomplete = function(input, options)
{
    // Create a link to self
    var me = this;

    // Create jQuery object for input element
    var $input = $(input).attr("autocomplete", "off");

    // Apply inputClass if necessary
    if (options.inputClass) $input.addClass(options.inputClass);

    // Create results
    var results = document.createElement("div");
    // Create jQuery object for results
    var $results = $(results);
    $results.hide().addClass(options.resultsClass).css("position", "absolute");
    if (options.width > 0) $results.css("width", options.width);

    // Add to body element
    $("body").append(results);

    input.autocompleter = me;

    var timeout = null;
    var prev = "";
    var active = -1;
    var cache = {};
    var keyb = false;
    var hasFocus = false;
    var lastKeyPressCode = null;
    var regExp = /[^a-zA-Z0-9\u4E00-\u9FA5\s\-]/g; //屏蔽特殊字符,[\u4e00-\u9fa5]是unicode编码中双字节汉字部分

    // flush cache
    function flushCache()
    {
        cache = {};
        cache.data = {};
        cache.length = 0;
    };

    // flush cache
    flushCache();

    // if there is a data array supplied
    if (options.data != null)
    {
        var sFirstChar = "", stMatchSets = {}, row = [];

        // no url was specified, we need to adjust the cache length to make sure it fits the local data store
        if (typeof options.url != "string") options.cacheLength = 1;

        // loop through the array and create a lookup structure
        for (var i = 0; i < options.data.length; i++)
        {
            // if row is a string, make an array otherwise just reference the array
            row = ((typeof options.data[i] == "string") ? [options.data[i]] : options.data[i]);

            // if the length is zero, don't add to list
            if (row[0].length > 0)
            {
                // get the first character
                sFirstChar = row[0].substring(0, 1).toLowerCase();
                // if no lookup array for this character exists, look it up now
                if (!stMatchSets[sFirstChar]) stMatchSets[sFirstChar] = [];
                // if the match is a string
                stMatchSets[sFirstChar].push(row);
            }
        }

        // add the data items to the cache
        for (var k in stMatchSets)
        {
            // increase the cache size
            options.cacheLength++;
            // add to the cache
            addToCache(k, stMatchSets[k]);
        }
    }

    $input
	.keydown(function(e)
	{
	    // track last key pressed
	    lastKeyPressCode = e.keyCode;
	    switch (e.keyCode)
	    {
	        case 37: // left
	            //e.preventDefault();
	            break;
	        case 38: // up
	            e.preventDefault();
	            moveSelect(-1);
	            break;
	        case 39: // right
	            //e.preventDefault();
	            break;
	        case 40: // down
	            e.preventDefault();
	            moveSelect(1);
	            break;
	        case 9:  // tab
	        case 13: // return
	            if (selectCurrent())
	            {
	                // make sure to blur off the current field
	                //$input.get(0).blur();
	                e.preventDefault();
	            }
	            hideResults();
	            break;
	        default:
	            active = -1;
	            if (timeout) clearTimeout(timeout);
	            timeout = setTimeout(function() { onChange(); }, options.delay);
	            break;
	    }
	})
	.focus(function()
	{
	    // track whether the field has focus, we shouldn't process any results if the field no longer has focus
	    hasFocus = true;
	})
	.blur(function()
	{
	    // track whether the field has focus
	    hasFocus = false;
	    hideResults();
	    //	    var v = $input.val();
	    //	    if (regExp.exec(v))
	    //	        $input.val(v.replace(regExp, ""));
	})
	.bind("input", function()
	{
	    // fix firefox chinese input
	    onChange();
	});

    hideResultsNow();

    function onChange()
    {
        // ignore if the following keys are pressed: [del] [shift] [capslock]
        var v = $input.val();
        if (lastKeyPressCode == 46 || (lastKeyPressCode > 8 && lastKeyPressCode < 32))
        {
            //            if (regExp.exec(v))
            //                $input.val(v.replace(regExp, ""));
            return $results.hide();
        }
        //        else
        //        {
        //            if (regExp.exec(v))
        //                $input.val(v.replace(regExp, ""));
        //        }
        ////$input.val($input.val().replace(regExp, "")); //屏蔽特殊字符
        v = $input.val();
        if (v == "") return;

        if (v == prev) return;
        prev = v;
        if (v.length >= options.minChars)
        {
            $input.addClass(options.loadingClass);
            requestData(v);
        } else
        {
            $input.removeClass(options.loadingClass);
            $results.hide();
        }
    };

    function moveSelect(step)
    {

        var lis = $("li", results);
        if (!lis) return;

        active += step;

        if (active < 0)
        {
            active = lis.size() - 1;
        } else if (active >= lis.size())
        {
            active = 0;
        }

        lis.removeClass("ac_over");

        $(lis[active]).addClass("ac_over");

        // Weird behaviour in IE
        // if (lis[active] && lis[active].scrollIntoView) {
        // 	lis[active].scrollIntoView(false);
        // }

    };

    function selectCurrent()
    {
        var li = $("li.ac_over", results)[0];
        if (!li)
        {
            var $li = $("li", results);
            if (options.selectOnly)
            {
                if ($li.length == 1) li = $li[0];
            } else if (options.selectFirst)
            {
                li = $li[0];
            }
        }
        if (li)
        {
            selectItem(li);
            return true;
        } else
        {
            return false;
        }
    };

    function selectItem(li)
    {
        if (!li)
        {
            li = document.createElement("li");
            li.extra = [];
            li.selectValue = "";
        }
        var v = $.trim(li.selectValue ? li.selectValue : li.innerHTML);
        input.lastSelected = v;
        prev = v;
        $results.html("");
        $input.val(v);
        //根据结果更改当前搜索版块
        //        if (typeof (options.category) != "undefined" && options.category != "" && typeof (li.currType) != "undefined" && li.currType != "")
        //        {
        //            //逛街中的新闻版面
        //            if (li.currType == "#a_shop_news")
        //            {
        //                select_topnav_style($("#a_shop"));
        //                g_searchType = "News";
        //            }
        //            else if (li.currType == "#a_shop")
        //            {
        //                //确定搜索页面的当前搜索标志也是poi
        //                select_topnav_style($(li.currType));
        //                if ($("#iscn_ifrmMain").contents().find("#hidCurrSearch").length > 0)
        //                    $("#iscn_ifrmMain").contents().find("#hidCurrSearch").val("poi");
        //            }
        //            else
        //                select_topnav_style($(li.currType));
        //        }
        hideResultsNow();
        if (options.onItemSelect) setTimeout(function() { options.onItemSelect(li) }, 1);
    };

    // selects a portion of the input string
    function createSelection(start, end)
    {
        // get a reference to the input element
        var field = $input.get(0);
        if (field.createTextRange)
        {
            var selRange = field.createTextRange();
            selRange.collapse(true);
            selRange.moveStart("character", start);
            selRange.moveEnd("character", end);
            selRange.select();
        } else if (field.setSelectionRange)
        {
            field.setSelectionRange(start, end);
        } else
        {
            if (field.selectionStart)
            {
                field.selectionStart = start;
                field.selectionEnd = end;
            }
        }
        field.focus();
    };

    // fills in the input box w/the first match (assumed to be the best match)
    function autoFill(sValue)
    {
        // if the last user key pressed was backspace, don't autofill
        if (lastKeyPressCode != 8)
        {
            // fill in the value (keep the case the user has typed)
            $input.val($input.val() + sValue.substring(prev.length));
            // select the portion of the value not typed by the user (so the next character will erase)
            createSelection(prev.length, sValue.length);
        }
    };

    function showResults()
    {
        // get the position of the input field right now (in case the DOM is shifted)
        var pos = findPos(input);
        // either use the specified width, or autocalculate based on form element
        var iWidth = (options.width > 0) ? options.width : $input.width();
        // reposition
        $results.css({
            width: parseInt(iWidth) + "px",
            top: (pos.y + input.offsetHeight) + "px",
            left: pos.x + "px"
        }).show();
    };

    function hideResults()
    {
        if (timeout) clearTimeout(timeout);
        timeout = setTimeout(hideResultsNow, 200);
    };

    function hideResultsNow()
    {
        if (timeout) clearTimeout(timeout);
        $input.removeClass(options.loadingClass);
        if ($results.is(":visible"))
        {
            $results.hide();
        }
        if (options.mustMatch)
        {
            var v = $input.val();
            if (v != input.lastSelected)
            {
                selectItem(null);
            }
        }
    };

    function receiveData(q, data)
    {
        if (data)
        {
            $input.removeClass(options.loadingClass);
            results.innerHTML = "";

            // if the field no longer has focus or if there are no matches, do not display the drop down
            if (!hasFocus || data.length == 0) return hideResultsNow();

            if ($.browser.msie)
            {
                // we put a styled iframe behind the calendar so HTML SELECT elements don't show through
                //暂时屏蔽
                //$results.append(document.createElement('iframe'));
            }
            results.appendChild(dataToDom(data));
            // autofill in the complete box w/the first match as long as the user hasn't entered in more data
            if (options.autoFill && ($input.val().toLowerCase() == q.toLowerCase())) autoFill(data[0][0]);
            showResults();
        } else
        {
            hideResultsNow();
        }
    };

    function parseData(data)
    {
        if (!data) return null;
        var parsed = [];
        data = data; //转换JSON
        var row; //= data.split(options.lineSeparator);
        for (var i = 0; i < data.dataCount; i++)
        {
            row = data.dataSet[i]; //$.trim(rows[i]);//读取dataSet
            if (row)
            {
                parsed[parsed.length] = row; //row.split(options.cellSeparator);
            }
        }
        return parsed;
    };

    function dataToDom(data)
    {
        var ul = document.createElement("ul");
        var num = data.length;
        var row;
        var li;
        // limited results to a max number
        if ((options.maxItemsToShow > 0) && (options.maxItemsToShow < num)) num = options.maxItemsToShow;

        for (var i = 0; i < num; i++)
        //for (var row in data.dataSet)
        {
            row = data[i];
            if (!row) continue;
            li = document.createElement("li");
            if (options.formatItem)
            {
                if (typeof (options.category) != "undefined" && options.category != "")
                {
                    li.innerHTML = '<span style="float:left;">' + options.formatItem(row, i, num) + '</span><span style="float:right;">' + row[options.category] + '</span>';
                    //                    if (row[options.category] == "黄页")
                    //                        li.currType = "#a_shop";
                    //                    else if (row[options.category] == "人生轨迹")
                    //                        li.currType = "#a_line";
                    //                    else if (row[options.category] == "同乘佳缘")
                    //                        li.currType = "#a_trafficline";
                    //                    else if (row[options.category] == "我行我秀")
                    //                        li.currType = "#a_imagediy";
                    //                    else if (row[options.category] == "新闻")
                    //                        li.currType = "#a_shop_news";
                }
                else
                    li.innerHTML = options.formatItem(row, i, num);
            }
            else
            {
                if (typeof (options.category) != "undefined" && options.category != "")
                {
                    li.innerHTML = '<span style="float:left;">' + options.formatItem(row, i, num) + '</span><span style="float:right;">' + row[options.category] + '</span>';
                    //                    if (row[options.category] == "黄页")
                    //                        li.currType = "#a_shop";
                    //                    else if (row[options.category] == "人生轨迹")
                    //                        li.currType = "#a_line";
                    //                    else if (row[options.category] == "同乘佳缘")
                    //                        li.currType = "#a_trafficline";
                    //                    else if (row[options.category] == "我行我秀")
                    //                        li.currType = "#a_imagediy";
                    //                    else if (row[options.category] == "新闻")
                    //                        li.currType = "#a_shop_news";
                }
                else
                    li.innerHTML = options.formatItem(row, i, num);
            }
            li.selectValue = $.trim(row[options.showName]);
            li.title = $.trim(row[options.showName]);
            var extra = null;
            if (row.length > 1)
            {
                extra = [];
                for (var j = 1; j < row.length; j++)
                {
                    extra[extra.length] = row[j];
                }
            }
            li.extra = extra;
            ul.appendChild(li);
            $(li).hover(
				function() { $("li", ul).removeClass("ac_over"); $(this).addClass("ac_over"); active = $("li", ul).indexOf($(this).get(0)); },
				function() { $(this).removeClass("ac_over"); }
			).click(function(e) { e.preventDefault(); e.stopPropagation(); selectItem(this) });
        }
        return ul;
    };

    function requestData(q)
    {
        if (!options.matchCase) q = q.toLowerCase();
        var data = options.cacheLength ? loadFromCache(q) : null;
        // recieve the cached data
        if (data)
        {
            receiveData(q, data);
            // if an AJAX url has been supplied, try loading the data now
        } else if ((typeof options.url == "string") && (options.url.length > 0))
        {
            //var objParam = new Object();
            //objParam["requestMethod"] = "beforeSearch";
            $.post(options.url, makeUrl(q), function(data)//用post方式,直接请求数据类型为json
            //$.get(makeUrl(q), function(data)
            {
                data = parseData(data);
                addToCache(q, data);
                receiveData(q, data);
            }, 'json');
            // if there's been no data found, remove the loading class
        } else
        {
            $input.removeClass(options.loadingClass);
        }
    };

    function makeUrl(q)
    {
        //var randomNum = Math.round(-10000 * Math.random());
        //        var url = options.url + "?searchKey=" + escape(q);
        //        for (var i in options.extraParams)
        //        {
        //            url += "&" + i + "=" + escape(options.extraParams[i]);
        //        }
        //        if (typeof (options.category) != "undefined" && options.category != "")
        //            url += "&category=" + options.category;

        //        var reg = /[^\x00-\xff]/g;
        //        if (reg.exec(q))
        //            url += "&isFFC=true";
        //        else
        //            url += "&isFFC=false";
        var objParam = new Object();
        objParam["keyWord"] = q;
        for (var i in options.extraParams)
        {
            objParam[i] = options.extraParams[i];
        }
        if (typeof (options.category) != "undefined" && options.category != "")
            objParam["category"] = options.category;

        var reg = /[^\x00-\xff]/;
        if (reg.exec(q))
            objParam["isFFC"] = true;
        else
            objParam["isFFC"] = false;
        if (objParam["isMultiSearch"] == true)
            objParam["searchType"] = g_searchType;
        return objParam;
    };

    function loadFromCache(q)
    {
        if (!q) return null;
        if (cache.data[q] && options.isCache) return cache.data[q]; //读取缓存
        if (options.isCache)
        {
            if (options.isMatchSubset)//是否从缓存中进行匹配筛选
            {
                for (var i = q.length - 1; i >= options.minChars; i--)
                {
                    var qs = q.substr(0, i);
                    var c = cache.data[qs];
                    if (c)
                    {
                        var csub = [];
                        var row;
                        var temp;
                        for (var j = 0; j < c.length; j++)
                        {
                            row = c[j];
                            temp = $.trim(row[options.showName]);
                            if (matchSubset(temp, q))
                            {
                                //csub[csub.length] = x;
                                csub[j] = row;
                            }
                        }
                        return csub;
                    }
                }
            }
        }
        return null;
    };

    function matchSubset(s, sub)
    {
        if (!options.matchCase) s = s.toLowerCase();
        var i = s.indexOf(sub);
        if (i == -1) return false;
        return i == 0 || options.matchContains;
    };

    this.flushCache = function()
    {
        flushCache();
    };

    this.setExtraParams = function(p)
    {
        options.extraParams = p;
    };

    this.findValue = function()
    {
        var q = $input.val();

        if (!options.matchCase) q = q.toLowerCase();
        var data = options.cacheLength ? loadFromCache(q) : null;
        if (data)
        {
            findValueCallback(q, data);
        } else if ((typeof options.url == "string") && (options.url.length > 0))
        {
            $.get(makeUrl(q), function(data)
            {
                data = parseData(data)
                addToCache(q, data);
                findValueCallback(q, data);
            });
        } else
        {
            // no matches
            findValueCallback(q, null);
        }
    }

    function findValueCallback(q, data)
    {
        if (data) $input.removeClass(options.loadingClass);

        var num = (data) ? data.length : 0;
        var li = null;

        for (var i = 0; i < num; i++)
        {
            var row = data[i];

            if (row[0].toLowerCase() == q.toLowerCase())
            {
                li = document.createElement("li");
                if (options.formatItem)
                {
                    if (options.category != "")
                        li.innerHTML = '<span style="float:left;">' + options.formatItem(row, i, num) + '</span><span style="float:right;">' + row[options.category] + '</span>';
                    else
                        li.innerHTML = options.formatItem(row, i, num);
                }
                else
                {
                    if (options.category != "")
                        li.innerHTML = '<span style="float:left;">' + options.formatItem(row, i, num) + '</span><span style="float:right;">' + row[options.category] + '</span>';
                    else
                        li.innerHTML = options.formatItem(row, i, num);
                }
                li.selectValue = $.trim(row[options.showName]);
                li.title = $.trim(row[options.showName]);

                var extra = null;
                if (row.length > 1)
                {
                    extra = [];
                    for (var j = 1; j < row.length; j++)
                    {
                        extra[extra.length] = row[j];
                    }
                }
                li.extra = extra;
            }
        }

        if (options.onFindValue) setTimeout(function() { options.onFindValue(li) }, 1);
    }

    function addToCache(q, data)
    {
        if (!data || !q || !options.cacheLength) return;
        if (!cache.length || cache.length > options.cacheLength)
        {
            flushCache();
            cache.length++;
        } else if (!cache[q])
        {
            cache.length++;
        }
        cache.data[q] = data;
    };

    function findPos(obj)
    {
        var curleft = obj.offsetLeft || 0;
        var curtop = obj.offsetTop || 0;
        while (obj = obj.offsetParent)
        {
            curleft += obj.offsetLeft
            curtop += obj.offsetTop
        }
        return { x: curleft, y: curtop };
    }
}

jQuery.fn.autocomplete = function(url, options, data)
{
    // Make sure options exists
    options = options || {};
    // Set url as option
    options.url = url;
    // set some bulk local data
    options.data = ((typeof data == "object") && (data.constructor == Array)) ? data : null;

    // Set default values for required options
    options.inputClass = options.inputClass || "ac_input";
    options.resultsClass = options.resultsClass || "ac_results";
    options.lineSeparator = options.lineSeparator || "\n";
    options.cellSeparator = options.cellSeparator || "|";
    options.minChars = options.minChars || 1;
    options.delay = options.delay || 400;
    options.matchCase = options.matchCase || 0; //是否匹配大小写
    options.isCache = options.isCache || false;
    options.mustMatch = options.mustMatch || 0;
    options.isMatchSubset = options.isMatchSubset || false; //是否从缓存中进行匹配筛选
    options.matchContains = options.matchContains || 0; //是否包含(在缓存中筛选时，如果该值为真，则加载缓存中所有数据)
    options.cacheLength = options.cacheLength || 1; //缓存列表的长度
    options.extraParams = options.extraParams || {}; //参数列表
    options.loadingClass = options.loadingClass || "ac_loading";
    options.selectFirst = options.selectFirst || false;
    options.selectOnly = options.selectOnly || false;
    options.maxItemsToShow = options.maxItemsToShow || -1;
    options.autoFill = options.autoFill || false;
    options.width = parseInt(options.width, 10) || 0;
    options.showName = options.showName || "Name";
    options.category = options.category || ""; //检索结果的分类字段
    this.each(function()
    {
        var input = this;
        new jQuery.autocomplete(input, options);
    });

    // Don't break the chain
    return this;
}

jQuery.fn.autocompleteArray = function(data, options)
{
    return this.autocomplete(null, options, data);
}

jQuery.fn.indexOf = function(e)
{
    for (var i = 0; i < this.length; i++)
    {
        if (this[i] == e) return i;
    }
    return -1;
};