define(function(require) { return function($) {
/*
*
* 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
*
*/

	$.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'); // 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.toLowerCase(), $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="#">ALL</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: []
	};
}});
