// Global accessible
$.slider = {};

// Provide global settings
$.slider.globalSettings = {
	'containerSelector'  : '.slider-container',
	'navigationSelector' : '.slider-nav',
	'linkSelector'       : 'a',
	'linkTargetAttr'     : 'href',
	'linkCurrentClass'   : 'current',
	'linkEvent'          : 'click',
	'speed'              : 1,
	'cycleSpeed'         : 5000
};

// The plugin
$.fn.slider = function (settings) {
	
	// Alias for this
	var slider = this;
	
	// Combine global with local settings
	settings = $.extend({}, $.slider.globalSettings, settings);
	
	// For each slider on page
	slider.each(function () {
		
		// Collect the three main jQuery objects
		var $slider = $(this);
		var $container = $slider.children(settings.containerSelector);
		var $nav = $slider.children(settings.navigationSelector);
		var $links = $nav.find(settings.linkSelector);
			
		// Add current class to first
		$links.first().addClass(settings.linkCurrentClass);
		
		// Healthy delegation
		$nav.delegate(settings.linkSelector, settings.linkEvent, function (e, cycle) {
			// Stop the hash tag, back button not needed here
			e.preventDefault();
			
			// The clicked link
			var $link = $(this);
			
			// The target <li>
			var $target = $($link.attr(settings.linkTargetAttr));
			
			// Remove .current from all links
			$links.removeClass(settings.linkCurrentClass);
			
			// Add back to needed link
			$link.addClass(settings.linkCurrentClass);
			
			// Animate to scroll position
			$container
				.animate({
					'scrollLeft': $container.scrollLeft() + $target.position().left
				}, settings.speed);
				
			// Wait another duration before cycling, this does not happen
			// if this is a normal cycle generated click
			if ( ! cycle && slider.cycleInstance !== null) {
				slider
					.stop()
					.cycle();
			}
		});
	});
	
	// Change target
	slider.step = function (step) {
		return slider.each(function () {
			var $links = $(this).children(settings.navigationSelector).find(settings.linkSelector);
			var $currentLink = $links.filter('.' + settings.linkCurrentClass);
			var currentIndex = $links.index($currentLink);
			var $nextLink;
			
			if ($links[currentIndex + step]) {
				$nextLink = $links.eq(currentIndex + step);
			} else if (step > 0) {
				$nextLink = $links.first();
			} else {
				$nextLink = $links.last();
			}
			
			$nextLink.trigger(settings.linkEvent, [true]);
		});
	};
	
	// Go forward
	slider.next = function () {
		return slider.step(+1);
	};
	
	// Go back
	slider.previous = function () {
		return slider.step(-1);
	};
	
	// Global cycle instance
	slider.cycleInstance = null;
	
	// Add cycle functionality
	slider.cycle = function (speed) {
		
		// No multi cycling
		if (slider.cycleInstance !== null) {
			return slider;
		}
		
		// Allow custom speed or use default
		speed = speed || settings.cycleSpeed;
		
		function cycle() {
			// For each slider, trigger click
			slider.next();
			slider.cycleInstance = setTimeout(cycle, speed);
		}
		
		slider.cycleInstance = setTimeout(cycle, speed);
		
		return slider;
	};
	
	// Allow the stopping of cycle
	slider.stop = function () {
		if (slider.cycleInstance !== null) {
			clearTimeout(slider.cycleInstance);
			slider.cycleInstance = null;
		}
		return slider;
	};
	
	// Return slider (aka this)
	return slider;
};

$(function () {
	var $slider = $('.slider').not('#slider-three')
		.slider()
		.cycle();
		
	$('.stop').toggle(function () {
		$slider.stop();
		$(this).text('Okay start again');
	}, function () {
		$slider.cycle();
		$(this).text('no, no, please stop');
	});
	
	var $sliderThree = $('#slider-three')
		.slider();
	
	// Listen to controls
	$('a[href="#nextious"]')
		.click($sliderThree.next);
	$('a[href="#previous"]')
		.click($sliderThree.previous);
});