/*
bxCarousel v1.0
Plugin developed by: Steven Wanderski
http://bxcarousel.com
http://stevenwanderski.com

Released under the GPL license:
http://www.gnu.org/licenses/gpl.html
*/

(function($) {
	$.fn.bxCarousel = function(options) {
		var defaults = {
			move : 4,
			display_num : 4,
			speed : 500,
			margin : 0,
			auto : false,
			auto_interval : 2000,
			auto_dir : 'next',
			auto_hover : false,
			next_text : 'next',
			next_image : '',
			prev_text : 'prev',
			prev_image : '',
			controls : true
		};
		var options = $.extend(defaults, options);
		return this.each(function() {
			var $this = $(this);
			var li = $this.find('li');
			var first = 0;
			var fe = 0;
			var last = options.display_num - 1;
			var le = options.display_num - 1;
			var is_working = false;
			var j = '';
			var clicked = false;
			li.css( {
				'listStyle' : 'none',
				'marginRight' : options.margin
			});
			var ow = li.outerWidth(true);
			wrap_width = (ow * options.display_num) - options.margin;
			var seg = ow * options.move;
			//$this.wrap('<div class="bx_container"></div>').width(999999);
			if (options.controls) {
				if (options.next_image != '' || options.prev_image != '') {
					var controls = '<a href="" class="prev"><img src="'
							+ options.prev_image
							+ '"/></a><a href="" class="next"><img src="'
							+ options.next_image + '"/></a>';
				} else {
					var controls = '<a href="" class="prev">'
							+ options.prev_text
							+ '</a><a href="" class="next">'
							+ options.next_text + '</a>';
				}
			}
			/*$this.parent('.bx_container').wrap('<div class="bx_wrap"></div>')
					.css( {
						'float' : 'left',
						'position' : 'relative',
						'width' : wrap_width,
						'overflow' : 'hidden'
					}).before(controls);*/
			$this.parent('.bx_container')
			.css( {
				'width' : wrap_width
			}).before(controls);
			var w = li.slice(0, options.display_num).clone();
			var last_appended = (options.display_num + options.move) - 1;
			$this.empty().append(w);
			get_p();
			get_a();
			$this.css( {
				'position' : 'relative',
				'left' : -(seg)
			});
			$('.next').click(function() {
				slide_next();
				//clearInterval(j);alert(j);
				clicked = true;
				return false;
			});
			//$this.parent().siblings('.prev').click(function() {
			$('.prev').click(function() {
				slide_prev();
				//clearInterval(j);alert(j);
				clicked = true;
				return false;
			});
			if (options.auto) {
				start_slide();
				if (options.auto_hover) {
					$this.find('li').live('mouseenter', function() {
							clearInterval(j);
					});
					$this.find('li').live('mouseleave', function() {
							start_slide();
					});
				}
			}
			//当鼠标悬停在前后按钮位置上时，则停止自动滚动
			$('.prev,.next').mouseover(function () {
				clearInterval(j);
			}).mouseout(function () {
				start_slide();
			});
			
			function start_slide() {
				if (options.auto_dir == 'next') {
					j = setInterval(function() {
						slide_next()
					}, options.auto_interval);
				} else {
					j = setInterval(function() {
						slide_prev()
					}, options.auto_interval);
				}
			}
			function slide_next() {
				if (!is_working) {
					is_working = true;
					set_pos('next');
					$this.animate( {
						left : '-=' + seg
					}, options.speed, function() {
						$this.find('li').slice(0, options.move).remove();
						$this.css('left', -(seg));
						get_a();
						is_working = false;
					});
				}
			}
			function slide_prev() {
				if (!is_working) {
					is_working = true;
					set_pos('prev');
					$this.animate( {
						left : '+=' + seg
					}, options.speed, function() {
						$this.find('li').slice(-options.move).remove();
						$this.css('left', -(seg));
						get_p();
						is_working = false;
					});
				}
			}
			function get_a() {
				var str = new Array();
				var lix = li.clone();
				le = last;
				for (i = 0; i < options.move; i++) {
					le++
					if (lix[le] != undefined) {
						str[i] = $(lix[le]);
					} else {
						le = 0;
						str[i] = $(lix[le]);
					}
				}
				$.each(str, function(index) {
					$this.append(str[index][0]);
				});
			}
			function get_p() {
				var str = new Array();
				var lix = li.clone();
				fe = first;
				for (i = 0; i < options.move; i++) {
					fe--
					if (lix[fe] != undefined) {
						str[i] = $(lix[fe]);
					} else {
						fe = li.length - 1;
						str[i] = $(lix[fe]);
					}
				}
				$.each(str, function(index) {
					$this.prepend(str[index][0]);
				});
			}
			function set_pos(dir) {
				if (dir == 'next') {
					first += options.move;
					if (first >= li.length) {
						first = first % li.length;
					}
					last += options.move;
					if (last >= li.length) {
						last = last % li.length;
					}
				} else if (dir == 'prev') {
					first -= options.move;
					if (first < 0) {
						first = li.length + first;
					}
					last -= options.move;
					if (last < 0) {
						last = li.length + last;
					}
				}
			}
		});
	}
})(jQuery);