/*
 * Autocomplete - jQuery plugin 1.0.2
 *
 * Copyright (c) 2007 Dylan Verheul, Dan G. Switzer, Anjesh Tuladhar, Jörn Zaefferer
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.autocomplete.js 5747 2008-06-25 18:30:55Z joern.zaefferer $
 *
 */

;(function($) {

        $.fn.extend({
            autocomplete: function(urlOrData, options) {
                var isUrl = typeof urlOrData == "string";
                options = $.extend({}, $.Autocompleter.defaults, {
                    url: isUrl ? urlOrData : null,
                    data: isUrl ? null : urlOrData,
                    delay: isUrl ? $.Autocompleter.defaults.delay : 10,
                    max: options && !options.scroll ? 10 : 150
                }, options);

                // if highlight is set to false, replace it with a do-nothing function
                options.highlight = options.highlight || function(value) { return value; };

                // if the formatMatch option is not specified, then use formatItem for backwards compatibility
                options.formatMatch = options.formatMatch || options.formatItem;

                return this.each(function() {
                    new $.Autocompleter(this, options);
                });
            },
            result: function(handler) {
                return this.bind("result", handler);
            },
            search: function(handler) {
                return this.trigger("search", [handler]);
            },
            flushCache: function() {
                return this.trigger("flushCache");
            },
            setOptions: function(options) {
                return this.trigger("setOptions", [options]);
            },
            unautocomplete: function() {
                return this.trigger("unautocomplete");
            }
        });

        $.Autocompleter = function(input, options) {

            var KEY = {
                UP: 38,
                DOWN: 40,
                DEL: 46,
                TAB: 9,
                RETURN: 13,
                ESC: 27,
                COMMA: 188,
                PAGEUP: 33,
                PAGEDOWN: 34,
                BACKSPACE: 8
            };

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

            var timeout;
            var previousValue = "";
            var cache = $.Autocompleter.Cache(options);
            var hasFocus = 0;
            var lastKeyPressCode;
            var config = {
                mouseDownOnSelect: false
            };
            var select = $.Autocompleter.Select(options, input, selectCurrent, config);

            var blockSubmit;

            // prevent form submit in opera when selecting with return key
            $.browser.opera && $(input.form).bind("submit.autocomplete", function() {
                if (blockSubmit) {
                    blockSubmit = false;
                    return false;
                }
            });

            // only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
            $input.bind(($.browser.opera ? "keypress" : "keydown") + ".autocomplete", function(event) {
                // track last key pressed
                lastKeyPressCode = event.keyCode;
                switch (event.keyCode) {

                    case KEY.UP:
                        event.preventDefault();
                        if (select.visible()) {
                            select.prev();
                        } else {
                            onChange(0, true);
                        }
                        break;

                    case KEY.DOWN:
                        event.preventDefault();
                        if (select.visible()) {
                            select.next();
                        } else {
                            onChange(0, true);
                        }
                        break;

                    case KEY.PAGEUP:
                        event.preventDefault();
                        if (select.visible()) {
                            select.pageUp();
                        } else {
                            onChange(0, true);
                        }
                        break;

                    case KEY.PAGEDOWN:
                        event.preventDefault();
                        if (select.visible()) {
                            select.pageDown();
                        } else {
                            onChange(0, true);
                        }
                        break;

                    // matches also semicolon  
                    case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
                    case KEY.TAB:
                    case KEY.RETURN:
                        if (selectCurrent()) {
                            // stop default to prevent a form submit, Opera needs special handling
                            event.preventDefault();
                            blockSubmit = true;
                            return false;
                        }
                        break;

                    case KEY.ESC:
                        select.hide();
                        break;

                    default:
                        clearTimeout(timeout);
                        timeout = setTimeout(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++;
            }).blur(function() {
                hasFocus = 0;
                if (!config.mouseDownOnSelect) {
                    hideResults();
                }
            }).click(function() {
                // show select when clicking in a focused field
                if (hasFocus++ > 1 && !select.visible()) {
                    onChange(0, true);
                }
            }).bind("search", function() {
                // TODO why not just specifying both arguments?
                var fn = (arguments.length > 1) ? arguments[1] : null;
                function findValueCallback(q, data) {
                    var result;
                    if (data && data.length) {
                        for (var i = 0; i < data.length; i++) {
                            if (data[i].result.toLowerCase() == q.toLowerCase()) {
                                result = data[i];
                                break;
                            }
                        }
                    }
                    if (typeof fn == "function") fn(result);
                    else $input.trigger("result", result && [result.data, result.value]);
                }
                $.each(trimWords($input.val()), function(i, value) {
                    request(value, findValueCallback, findValueCallback);
                });
            }).bind("flushCache", function() {
                cache.flush();
            }).bind("setOptions", function() {
                $.extend(options, arguments[1]);
                // if we've updated the data, repopulate
                if ("data" in arguments[1])
                    cache.populate();
            }).bind("unautocomplete", function() {
                select.unbind();
                $input.unbind();
                $(input.form).unbind(".autocomplete");
            });


            function selectCurrent() {
                var selected = select.selected();
                if (!selected)
                    return false;

                var v = selected.result;
                previousValue = v;

                if (options.multiple) {
                    var words = trimWords($input.val());
                    if (words.length > 1) {
                        v = words.slice(0, words.length - 1).join(options.multipleSeparator) + options.multipleSeparator + v;
                    }
                    v += options.multipleSeparator;
                }

                $input.val(v);
                hideResultsNow();
                $input.trigger("result", [selected.data, selected.value]);
                return true;
            }

            function onChange(crap, skipPrevCheck) {
                if (lastKeyPressCode == KEY.DEL) {
                    select.hide();
                    return;
                }

                var currentValue = $input.val();

                if (!skipPrevCheck && currentValue == previousValue)
                    return;

                previousValue = currentValue;

                currentValue = lastWord(currentValue);
                if (currentValue.length >= options.minChars) {
                    $input.addClass(options.loadingClass);
                    if (!options.matchCase)
                        currentValue = currentValue.toLowerCase();
                    request(currentValue, receiveData, hideResultsNow);
                } else {
                    stopLoading();
                    select.hide();
                }
            };

            function trimWords(value) {
                if (!value) {
                    return [""];
                }
                var words = value.split(options.multipleSeparator);
                var result = [];
                $.each(words, function(i, value) {
                    if ($.trim(value))
                        result[i] = $.trim(value);
                });
                return result;
            }

            function lastWord(value) {
                if (!options.multiple)
                    return value;
                var words = trimWords(value);
                return words[words.length - 1];
            }

            // fills in the input box w/the first match (assumed to be the best match)
            // q: the term entered
            // sValue: the first matching result
            function autoFill(q, sValue) {
                // autofill in the complete box w/the first match as long as the user hasn't entered in more data
                // if the last user key pressed was backspace, don't autofill
                if (options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE) {
                    // fill in the value (keep the case the user has typed)
                    $input.val($input.val() + sValue.substring(lastWord(previousValue).length));
                    // select the portion of the value not typed by the user (so the next character will erase)
                    $.Autocompleter.Selection(input, previousValue.length, previousValue.length + sValue.length);
                }
            };

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

            function hideResultsNow() {
                var wasVisible = select.visible();
                select.hide();
                clearTimeout(timeout);
                stopLoading();
                if (options.mustMatch) {
                    // call search and run callback
                    $input.search(
				function(result) {
                        // if no value found, clear the input box
                        if (!result) {
                            if (options.multiple) {
                                var words = trimWords($input.val()).slice(0, -1);
                                $input.val(words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : ""));
                            }
                            else
                                $input.val("");
                        }
                    }
			);
                }
                if (wasVisible)
                // position cursor at end of input field
                    $.Autocompleter.Selection(input, input.value.length, input.value.length);
            };

            function receiveData(q, data) {
                if (data && data.length && hasFocus) {
                    stopLoading();
                    select.display(data, q);
                    autoFill(q, data[0].value);
                    select.show();
                } else {
                    hideResultsNow();
                }
            };

            function request(term, success, failure) {
                if (!options.matchCase)
                    term = term.toLowerCase();
                var data = cache.load(term);
                // recieve the cached data
                if (data && data.length) {
                    success(term, data);
                    // if an AJAX url has been supplied, try loading the data now
                } else if ((typeof options.url == "string") && (options.url.length > 0)) {

                    var extraParams = {
                        timestamp: +new Date()
                    };
                    $.each(options.extraParams, function(key, param) {
                        extraParams[key] = typeof param == "function" ? param() : param;
                    });

                    $.ajax({
                        // try to leverage ajaxQueue plugin to abort previous requests
                        mode: "abort",
                        // limit abortion to this input
                        port: "autocomplete" + input.name,
                        //dataType: options.dataType,
                        url: options.url,
                        contentType: "application/json; charset=utf-8",
                        dataType: "json",
                        type: "POST",
                        data: "{'q':" + lastWord(term) + "}",
                        /*				data: $.extend({
                        q: lastWord(term),
                        limit: options.max
                        }, extraParams),
                        */
                        success: function(data) {
                            var parsed = options.parse && options.parse(data) || parse(data);
                            cache.add(term, parsed);
                            success(term, parsed);
                        }
                    });
                } else {
                    // if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
                    select.emptyList();
                    failure(term);
                }
            };

            function parse(data) {
                //data = eval("\"" + data + "\"");
                var parsed = [];
                //var rows = data.split("\n");
                var rows = data.d;
                for (var i = 0; i < rows.length; i++) {
                    var row = $.trim(rows[i]);
                    if (row) {
                        row = row.split("|");
                        parsed[parsed.length] = {
                            data: row,
                            value: row[0],
                            result: options.formatResult && options.formatResult(row, row[0]) || row[0]
                        };
                    }
                }
                return parsed;
            };

            function stopLoading() {
                $input.removeClass(options.loadingClass);
            };

        };

        $.Autocompleter.defaults = {
            inputClass: "ac_input",
            resultsClass: "ac_results",
            loadingClass: "ac_loading",
            minChars: 1,
            delay: 400,
            matchCase: false,
            matchSubset: true,
            matchContains: false,
            cacheLength: 10,
            max: 100,
            mustMatch: false,
            extraParams: {},
            selectFirst: true,
            formatItem: function(row) { return row[0]; },
            formatMatch: null,
            autoFill: false,
            width: 0,
            multiple: false,
            multipleSeparator: ", ",
            highlight: function(value, term) {
                return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>");
            },
            scroll: true,
            scrollHeight: 180
        };

        $.Autocompleter.Cache = function(options) {

            var data = {};
            var length = 0;

            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;
            };

            function add(q, value) {
                if (length > options.cacheLength) {
                    flush();
                }
                if (!data[q]) {
                    length++;
                }
                data[q] = value;
            }

            function populate() {
                if (!options.data) return false;
                // track the matches
                var stMatchSets = {},
			nullData = 0;

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

                // track all options for minChars = 0
                stMatchSets[""] = [];

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

                    var value = options.formatMatch(rawValue, i + 1, options.data.length);
                    if (value === false)
                        continue;

                    var firstChar = value.charAt(0).toLowerCase();
                    // if no lookup array for this character exists, look it up now
                    if (!stMatchSets[firstChar])
                        stMatchSets[firstChar] = [];

                    // if the match is a string
                    var row = {
                        value: value,
                        data: rawValue,
                        result: options.formatResult && options.formatResult(rawValue) || value
                    };

                    // push the current match into the set list
                    stMatchSets[firstChar].push(row);

                    // keep track of minChars zero items
                    if (nullData++ < options.max) {
                        stMatchSets[""].push(row);
                    }
                };

                // add the data items to the cache
                $.each(stMatchSets, function(i, value) {
                    // increase the cache size
                    options.cacheLength++;
                    // add to the cache
                    add(i, value);
                });
            }

            // populate any existing data
            setTimeout(populate, 25);

            function flush() {
                data = {};
                length = 0;
            }

            return {
                flush: flush,
                add: add,
                populate: populate,
                load: function(q) {
                    if (!options.cacheLength || !length)
                        return null;
                    /* 
                    * if dealing w/local data and matchContains than we must make sure
                    * to loop through all the data collections looking for matches
                    */
                    if (!options.url && options.matchContains) {
                        // track all matches
                        var csub = [];
                        // loop through all the data grids for matches
                        for (var k in data) {
                            // don't search through the stMatchSets[""] (minChars: 0) cache
                            // this prevents duplicates
                            if (k.length > 0) {
                                var c = data[k];
                                $.each(c, function(i, x) {
                                    // if we've got a match, add it to the array
                                    if (matchSubset(x.value, q)) {
                                        csub.push(x);
                                    }
                                });
                            }
                        }
                        return csub;
                    } else
                    // if the exact item exists, use it
                        if (data[q]) {
                        return data[q];
                    } else
                        if (options.matchSubset) {
                        for (var i = q.length - 1; i >= options.minChars; i--) {
                            var c = data[q.substr(0, i)];
                            if (c) {
                                var csub = [];
                                $.each(c, function(i, x) {
                                    if (matchSubset(x.value, q)) {
                                        csub[csub.length] = x;
                                    }
                                });
                                return csub;
                            }
                        }
                    }
                    return null;
                }
            };
        };

        $.Autocompleter.Select = function(options, input, select, config) {
            var CLASSES = {
                ACTIVE: "ac_over"
            };

            var listItems,
		active = -1,
		data,
		term = "",
		needsInit = true,
		element,
		list;

            // Create results
            function init() {
                if (!needsInit)
                    return;
                element = $("<div/>")
		.hide()
		.addClass(options.resultsClass)
		.css("position", "absolute")
		.appendTo(document.body);

                list = $("<ul/>").appendTo(element).mouseover(function(event) {
                    if (target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
                        active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
                        $(target(event)).addClass(CLASSES.ACTIVE);
                    }
                }).click(function(event) {
                    $(target(event)).addClass(CLASSES.ACTIVE);
                    select();
                    // TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus
                    input.focus();
                    return false;
                }).mousedown(function() {
                    config.mouseDownOnSelect = true;
                }).mouseup(function() {
                    config.mouseDownOnSelect = false;
                });

                if (options.width > 0)
                    element.css("width", options.width);

                needsInit = false;
            }

            function target(event) {
                var element = event.target;
                while (element && element.tagName != "LI")
                    element = element.parentNode;
                // more fun with IE, sometimes event.target is empty, just ignore it then
                if (!element)
                    return [];
                return element;
            }

            function moveSelect(step) {
                listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE);
                movePosition(step);
                var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
                if (options.scroll) {
                    var offset = 0;
                    listItems.slice(0, active).each(function() {
                        offset += this.offsetHeight;
                    });
                    if ((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) {
                        list.scrollTop(offset + activeItem[0].offsetHeight - list.innerHeight());
                    } else if (offset < list.scrollTop()) {
                        list.scrollTop(offset);
                    }
                }
            };

            function movePosition(step) {
                active += step;
                if (active < 0) {
                    active = listItems.size() - 1;
                } else if (active >= listItems.size()) {
                    active = 0;
                }
            }

            function limitNumberOfItems(available) {
                return options.max && options.max < available
			? options.max
			: available;
            }

            function fillList() {
                list.empty();
                var max = limitNumberOfItems(data.length);
                for (var i = 0; i < max; i++) {
                    if (!data[i])
                        continue;
                    var formatted = options.formatItem(data[i].data, i + 1, max, data[i].value, term);
                    if (formatted === false)
                        continue;
                    var li = $("<li/>").html(options.highlight(formatted, term)).addClass(i % 2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
                    $.data(li, "ac_data", data[i]);
                }
                listItems = list.find("li");
                if (options.selectFirst) {
                    listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
                    active = 0;
                }
                // apply bgiframe if available
                if ($.fn.bgiframe)
                    list.bgiframe();
            }

            return {
                display: function(d, q) {
                    init();
                    data = d;
                    term = q;
                    fillList();
                },
                next: function() {
                    moveSelect(1);
                },
                prev: function() {
                    moveSelect(-1);
                },
                pageUp: function() {
                    if (active != 0 && active - 8 < 0) {
                        moveSelect(-active);
                    } else {
                        moveSelect(-8);
                    }
                },
                pageDown: function() {
                    if (active != listItems.size() - 1 && active + 8 > listItems.size()) {
                        moveSelect(listItems.size() - 1 - active);
                    } else {
                        moveSelect(8);
                    }
                },
                hide: function() {
                    element && element.hide();
                    listItems && listItems.removeClass(CLASSES.ACTIVE);
                    active = -1;
                },
                visible: function() {
                    return element && element.is(":visible");
                },
                current: function() {
                    return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
                },
                show: function() {
                    var offset = $(input).offset();
                    element.css({
                        width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
                        top: offset.top + input.offsetHeight,
                        left: offset.left
                    }).show();
                    if (options.scroll) {
                        list.scrollTop(0);
                        list.css({
                            maxHeight: options.scrollHeight,
                            overflow: 'auto'
                        });

                        if ($.browser.msie && typeof document.body.style.maxHeight === "undefined") {
                            var listHeight = 0;
                            listItems.each(function() {
                                listHeight += this.offsetHeight;
                            });
                            var scrollbarsVisible = listHeight > options.scrollHeight;
                            list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight);
                            if (!scrollbarsVisible) {
                                // IE doesn't recalculate width when scrollbar disappears
                                listItems.width(list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")));
                            }
                        }

                    }
                },
                selected: function() {
                    var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
                    return selected && selected.length && $.data(selected[0], "ac_data");
                },
                emptyList: function() {
                    list && list.empty();
                },
                unbind: function() {
                    element && element.remove();
                }
            };
        };

        $.Autocompleter.Selection = function(field, start, end) {
            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();
        };

    })(jQuery);