/*
bxcarousel v1.0
plugin developed by: steven wanderski
*/

(function($) {
    $.fn.bxcarousel = function(options) {
        var defaults = {
            move: 4,
            display_num: 4,
            speed: 500,
            margin: 10,
            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({
                'float': 'left',
                'liststyle': 'none',
                'marginright': options.margin
            });
            var ow = li.outerwidth(true);
            var wrap_width = (ow * options.display_num) - options.margin;
            var seg = ow * options.move;
            $this.wrap('<div class="bx_container"></div>').width(999999999999);
            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({
                'position': 'relative',
                'width': wrap_width,
                'overflow': 'hidden'
            }).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)
            });
            $this.parent().siblings('.next').click(function() {
                slide_next();
                clearinterval(j);
                clicked = true;
                return false;
            });
            $this.parent().siblings('.prev').click(function() {
                slide_prev();
                clearinterval(j);
                clicked = true;
                return false;
            });
			
			
			
            if (options.auto) {
                start_slide();
                if (options.auto_hover && clicked != true) {
                    $this.find('li').on('mouseenter',
                    function() {
                        if (!clicked) {
                            clearinterval(j);
                        }
                    });
                    $this.find('li').on('mouseleave',
                    function() {
                        if (!clicked) {
                            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;
                    });
                }
				countdowntime();

            }
			
			
            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;
                    });
                }
				countdowntime();
            }
			
			function countdowntime(){
				
				$('.the_last li').each(function(index,value){
					var nowdate=new date();  //开始时间
					var plandate=new date($(value).find('.the_last span').html());    //结束时间
					var differ=plandate.gettime()-nowdate.gettime(); //时间差的毫秒数
					//计算出相差天数
					var days=math.floor(differ/(24*3600*1000));
					if(days<0){
						$(value).find('.the_last').html('课程进行中');
					}else{
						$(value).find('.the_last span').html(days);
					}
				});
				
				
			}
			
			
            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);