/*
 *
 * 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 = ['_', 'А', 'Б', 'В', 'Г', 'Д', 'Е', 'Ж', 'З', 'И', 'К', 'Л', 'М', 'Н', 'О', 'П', 'Р', 'С', 'Т', 'У', 'Ф', 'Х', 'Ц', 'Ч', 'Ш', 'Щ','Э','Ю','Я', '-'];
        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'); // user must abide by the convention: <ul id="myList"> for list and <div id="myList-nav"> for nav wrapper
            $list = $(this);

            var counts = {}, allCount = 0, isAll = true, numCount = 0, prevLetter = '';

            function init() {
                $wrapper.append(createLettersHtml());

                $letters = $('.ln-letters', $wrapper).slice(0, 1); // will always be a single item
                if (opts.showCounts) {
                    $letterCount = $('.ln-letter-count', $wrapper).slice(0, 1);
                } // will always be a single item

                addClasses();
                addNoMatchLI();
                if (opts.flagDisabled) {
                    addDisabledClass();
                }
                bindHandlers();

                if (!opts.includeAll) {
                    $list.show();
                } // show the list in case the recommendation for includeAll=false was taken

                // remove nav items we don't need
                //
                if (!opts.includeAll) {
                    $('.all', $letters).remove();
                }
                if (!opts.includeNums) {
                    $('._', $letters).remove();
                }
                if (!opts.includeOther) {
                    $('.-', $letters).remove();
                }

                $(':last', $letters).addClass('ln-last'); // allows for styling a case where last item needs right border set (because items before that only have top, left and bottom so that border between items isn't doubled)

                if ($.cookie && (opts.cookieName != null)) {
                    var cookieLetter = $.cookie(opts.cookieName);
                    if (cookieLetter != null) {
                        opts.initLetter = cookieLetter;
                    }
                }

                // decide what to show first
                //
                if (opts.initLetter != '') {
                    firstClick = true;
                    $('.' + opts.initLetter, $letters).slice(0, 1).click(); // click the initLetter if there was one
                }
                else {
                    if (opts.includeAll) {
                        $('.all', $letters).addClass('ln-selected');
                    } // showing all: we don't need to click this: the whole list is already loaded
                    else { // ALL link is hidden, click the first letter that will display LI's
                        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;
                            }
                        }
                    }
                }
            }

            // positions the letter count div above the letter links (so we only have to do it once: after this we just change it's left position via mouseover)
            //
            function setLetterCountTop() {
                $letterCount.css({ top: $('.a', $letters).slice(0, 1).offset({ margin: false, border: true }).top - $letterCount.outerHeight({ margin: true }) }); // note: don't set top based on '.all': it might not be visible
            }

            // adds a class to each LI that has text content inside of it (ie, inside an <a>, a <div>, nested DOM nodes, etc)
            //
            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 = '-';
                } // not A-Z, a-z or 0-9, so considered "other"
                if (!isNaN(firstChar)) {
                    firstChar = '_';
                } // use '_' if the first char is a number
                $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; // some letters may not have a count in the hash
                }
            }

            function bindHandlers() {

                // sets the top position of the count div in case something above it on the page has resized
                //
                if (opts.showCounts) {
                    $wrapper.mouseover(function() {
                        setLetterCountTop();
                    });
                }

                // mouseover for each letter: shows the count above the letter
                //
                if (opts.showCounts) {
                    $('a', $letters).mouseover(function() {
                        var left = $(this).position().left;
                        var width = ($(this).outerWidth({ margin: true }) - 1) + 'px'; // the -1 is to tweak the width a bit due to a seeming inaccuracy in jquery ui/dimensions outerWidth (same result in FF2 and IE6/7)
                        var count = getLetterCount(this);
                        $letterCount.css({ left: left, width: width }).text(count).show(); // set left position and width of letter count, set count text and show it
                    });

                    // mouseout for each letter: hide the count
                    //
                    $('a', $letters).mouseout(function() {
                        $letterCount.hide();
                    });
                }

                // click handler for letters: shows/hides relevant LI's
                //
                $('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(); // in case it's showing
                            $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;
                });
            }

            // creates the HTML for the letter links
            //
            function createLettersHtml() {
                var html = [];
                for (var i = 1; i < letters.length; i++) {
                    if (html.length == 0) {
                        html.push('<a class="all" href="#">&#1042;&#1089;&#1077;</a><a class="_" href="#">0-9</a>');
                    }
                    html.push('<a class="' + letters[i] + '" href="#">' + ((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>' : ''); // the styling for ln-letter-count is to give us a starting point for the element, which will be repositioned when made visible (ie, should not need to be styled by the user)
            }

            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);