/*!
Deck JS - deck.status
Copyright (c) 2011 Caleb Troughton
Dual licensed under the MIT license and GPL license.
https://github.com/imakewebthings/deck.js/blob/master/MIT-license.txt
https://github.com/imakewebthings/deck.js/blob/master/GPL-license.txt
*/

/*
This module adds a (current)/(total) style status indicator to the deck.
*/
(function($, deck, undefined) {
	var $d = $(document),
	
	updateCurrent = function(e, from, to) {
		var opts = $[deck]('getOptions');
		
		$(opts.selectors.statusCurrent).text(opts.countNested ?
			to + 1 :
			$[deck]('getSlide', to).data('rootSlide')
		);
	};
	
	/*
	Extends defaults/options.
	
	options.selectors.statusCurrent
		The element matching this selector displays the current slide number.
		
	options.selectors.statusTotal
		The element matching this selector displays the total number of slides.
		
	options.countNested
		If false, only top level slides will be counted in the current and
		total numbers.
	*/
	$.extend(true, $[deck].defaults, {
		selectors: {
			statusCurrent: '.deck-status-current',
			statusTotal: '.deck-status-total'
		},
		
		countNested: true
	});
	
	$d.bind('deck.init', function() {
		var opts = $[deck]('getOptions'),
		slides = $[deck]('getSlides'),
		$current = $[deck]('getSlide'),
		ndx;
		
		// Set total slides once
		if (opts.countNested) {
			$(opts.selectors.statusTotal).text(slides.length);
		}
		else {
			/* Determine root slides by checking each slide's ancestor tree for
			any of the slide classes. */
			var rootIndex = 1,
			slideTest = $.map([
				opts.classes.before,
				opts.classes.previous,
				opts.classes.current,
				opts.classes.next,
				opts.classes.after
			], function(el, i) {
				return '.' + el;
			}).join(', ');
			
			/* Store the 'real' root slide number for use during slide changes. */
			$.each(slides, function(i, $el) {
				var $parentSlides = $el.parentsUntil(opts.selectors.container, slideTest);

				$el.data('rootSlide', $parentSlides.length ?
					$parentSlides.last().data('rootSlide') :
					rootIndex++
				);
			});
			
			$(opts.selectors.statusTotal).text(rootIndex - 1);
		}
		
		// Find where we started in the deck and set initial state
		$.each(slides, function(i, $el) {
			if ($el === $current) {
				ndx = i;
				return false;
			}
		});
		updateCurrent(null, ndx, ndx);
	})
	/* Update current slide number with each change event */
	.bind('deck.change', updateCurrent);
})(jQuery, 'deck');