/*
*
* jQuery listnav plugin
* Copyright (c) 2009 iHwy, Inc.
* Author: Jack Killpatrick
*
* Version 2.1 (08/09/2009)
* Requires jQuery 1.3.2, jquery 1.2.6 or jquery 1.2.x plus the jquery dimensions plugin
*
* Visit http://www.ihwy.com/labs/jquery-listnav-plugin.aspx for more information.
*
* Dual licensed under the MIT and GPL licenses:
*   http://www.opensource.org/licenses/mit-license.php
*   http://www.gnu.org/licenses/gpl.html
*
*/

(function ($) {
    $.fn.listnav = function (options) {
        var opts = $.extend({}, $.fn.listnav.defaults, options);
        var letters = ['_', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '-'];
        var firstClick = false;
        opts.prefixes = $.map(opts.prefixes, function (n) {
            return n.toLowerCase();
        });
        return this.each(function () {
            var $wrapper, list, $list, $letters, $letterCount, id;
            id = this.id;
            $wrapper = $('#' + id + '-nav');
            $list = $(this);
            var counts = {},
                allCount = 0,
                isAll = true,
                numCount = 0,
                prevLetter = '';

            function init() {
                $wrapper.append(createLettersHtml());
                $letters = $('.ln-letters', $wrapper).slice(0, 1);
                if (opts.showCounts) $letterCount = $('.ln-letter-count', $wrapper).slice(0, 1);
                addClasses();
                addNoMatchLI();
                if (opts.flagDisabled) addDisabledClass();
                bindHandlers();
                if (!opts.includeAll) $list.show();
                if (!opts.includeAll) $('.all', $letters).remove();
                if (!opts.includeNums) $('._', $letters).remove();
                if (!opts.includeOther) $('.-', $letters).remove();
                $(':last', $letters).addClass('ln-last');
                if ($.cookie && (opts.cookieName != null)) {
                    var cookieLetter = $.cookie(opts.cookieName);
                    if (cookieLetter != null) opts.initLetter = cookieLetter;
                }
                if (opts.initLetter != '') {
                    firstClick = true;
                    $('.' + opts.initLetter.toLowerCase(), $letters).slice(0, 1).click();
                } else {
                    if (opts.includeAll) $('.all', $letters).addClass('ln-selected');
                    else {
                        for (var i = ((opts.includeNums) ? 0 : 1); i < letters.length; i++) {
                            if (counts[letters[i]] > 0) {
                                firstClick = true;
                                $('.' + letters[i], $letters).slice(0, 1).click();
                                break;
                            }
                        }
                    }
                }
            }

            function setLetterCountTop() {
                $letterCount.css({
                    top: $('.a', $letters).slice(0, 1).offset({
                        margin: false,
                        border: true
                    }).top - $letterCount.outerHeight({
                        margin: true
                    })
                });
            }

            function addClasses() {
                var str, firstChar, firstWord, spl, $this, hasPrefixes = (opts.prefixes.length > 0);
                $($list).children().each(function () {
                    $this = $(this), firstChar = '', str = $.trim($this.text()).toLowerCase();
                    if (str != '') {
                        if (hasPrefixes) {
                            spl = str.split(' ');
                            if ((spl.length > 1) && ($.inArray(spl[0], opts.prefixes) > -1)) {
                                firstChar = spl[1].charAt(0);
                                addLetterClass(firstChar, $this, true);
                            }
                        }
                        firstChar = str.charAt(0);
                        addLetterClass(firstChar, $this);
                    }
                });
            }

            function addLetterClass(firstChar, $el, isPrefix) {
                if (/\W/.test(firstChar)) firstChar = '-';
                if (!isNaN(firstChar)) firstChar = '_';
                $el.addClass('ln-' + firstChar);
                if (counts[firstChar] == undefined) counts[firstChar] = 0;
                counts[firstChar]++;
                if (!isPrefix) allCount++;
            }

            function addDisabledClass() {
                for (var i = 0; i < letters.length; i++) {
                    if (counts[letters[i]] == undefined) $('.' + letters[i], $letters).addClass('ln-disabled');
                }
            }

            function addNoMatchLI() {
                $list.append('<li class="ln-no-match" style="display:none">' + opts.noMatchText + '</li>');
            }

            function getLetterCount(el) {
                if ($(el).hasClass('all')) return allCount;
                else {
                    var count = counts[$(el).attr('class').split(' ')[0]];
                    return (count != undefined) ? count : 0;
                }
            }

            function bindHandlers() {
                if (opts.showCounts) {
                    $wrapper.mouseover(function () {
                        setLetterCountTop();
                    });
                }
                if (opts.showCounts) {
                    $('a', $letters).mouseover(function () {
                        var left = $(this).position().left;
                        var width = ($(this).outerWidth({
                            margin: true
                        }) - 1) + 'px';
                        var count = getLetterCount(this);
                        $letterCount.css({
                            left: left,
                            width: width
                        }).text(count).show();
                    });
                    $('a', $letters).mouseout(function () {
                        $letterCount.hide();
                    });
                }
                $('a', $letters).click(function () {
                    $('a.ln-selected', $letters).removeClass('ln-selected');
                    var letter = $(this).attr('class').split(' ')[0];
                    if (letter == 'all') {
                        $list.children().show();
                        $list.children('.ln-no-match').hide();
                        isAll = true;
                    } else {
                        if (isAll) {
                            $list.children().hide();
                            isAll = false;
                        } else if (prevLetter != '') $list.children('.ln-' + prevLetter).hide();
                        var count = getLetterCount(this);
                        if (count > 0) {
                            $list.children('.ln-no-match').hide();
                            $list.children('.ln-' + letter).show();
                        } else $list.children('.ln-no-match').show();
                        prevLetter = letter;
                    }
                    if ($.cookie && (opts.cookieName != null)) $.cookie(opts.cookieName, letter);
                    $(this).addClass('ln-selected');
                    $(this).blur();
                    if (!firstClick && (opts.onClick != null)) opts.onClick(letter);
                    else firstClick = false;
                    return false;
                });
            }

            function createLettersHtml() {
                var html = [];
                for (var i = 1; i < letters.length; i++) {
                    if (html.length == 0) html.push('<a class="all" onclick="javascript:return false;" href="#">ALL</a><a class="_" href="#">0-9</a>');
                    html.push('<a class="' + letters[i] + '" href="#" onclick="javascript:return false;" >' + ((letters[i] == '-') ? '...' : letters[i].toUpperCase()) + '</a>');
                }
                return '<div class="ln-letters">' + html.join('') + '</div>' + ((opts.showCounts) ? '<div class="ln-letter-count" style="display:none; position:absolute; top:0; left:0; width:20px;">0</div>' : '');
            }
            init();
        });
    };
    $.fn.listnav.defaults = {
        initLetter: '',
        includeAll: true,
        incudeOther: false,
        includeNums: true,
        flagDisabled: true,
        noMatchText: 'No matching entries',
        showCounts: true,
        cookieName: null,
        onClick: null,
        prefixes: []
    };
})(jQuery);