/*
 * hwSlider内容滑动切换插件（基于Zepto） - v1.0
 * by 月光光
 * http://www.helloweba.com
 */
;(function ($, window, document, undefined) {
    var HwSlider = function (ele, opt) {
        var self = this;
        self.$element = ele,
            self.defaults = {
                width: 600, //初始宽度
                height: 320, //初始高度
                start: 1, //初始滑动位置，从第几个开始滑动
                interval: 3000, //间隔时间，单位ms
                autoPlay: false,  //是否自动滑动
                dotShow: true, //是否显示圆点导航
                arrShow: true, //是否显示左右方向箭头导航
                touch: true //是否支持触摸滑动
            },
            self.options = $.extend({}, self.defaults, opt)
    }
    HwSlider.prototype = {
        init: function () {
            var self = this,
                ele = self.$element;

            var sliderInder = ele.children('ul')
            var hwsliderLi = sliderInder.children('li');
            var hwsliderSize = hwsliderLi.length;  //滑块的总个数
            var index = self.options.start;
            var touchStartY = 0, touchStartX = 0;

            for (i = 1; i <= hwsliderSize; i++) {
                if (index == i) hwsliderLi.eq(index - 1).css('display', 'block');
            }
            //显示左右方向键
            if (self.options.arrShow) {
                var arrElement = '<a href="javascript:;" class="arr prev">&lt;</a><a href="javascript:;" class="arr next">&gt;</a>';
                ele.append(arrElement);
            }

            //显示圆点导航
            if (self.options.dotShow) {
                var dot = '';
                for (i = 1; i <= hwsliderSize; i++) {
                    if (index == i) {
                        dot += '<span data-index="' + i + '" class="active"></span>';
                    } else {
                        dot += '<span data-index="' + i + '"></span>';
                    }
                }
                var dotElement = '<div class="dots">' + dot + '</div>';
                ele.append(dotElement);
            }

            //初始化组件
            var resize = function () {
                var sWidth = ele.width();
                //根据滑块宽度等比例缩放高度
                var sHeight = self.options.height / self.options.width * sWidth;
                // ele.css('height',sHeight); 

                if (self.options.arrShow) {
                    var arrOffset = (sHeight - 40) / 2;
                    ele.find(".arr").css('top', arrOffset + 'px'); //导航箭头位置
                }
                /*if(self.options.dotShow){
                 var dotWidth = hwsliderSize*20;
                 var dotOffset = (sWidth-dotWidth)/2;
                 ele.find(".dots").css('left',dotOffset+'px'); //导航圆点位置
                 }*/
            }

            // ele.css('height',self.options.height);
            resize();

            //窗口大小变换时自适应
            $(window).resize(function () {
                resize();
            });

            //点击导航圆点
            if (self.options.dotShow) {
                ele.find(".dots span").on('click', function (event) {
                    event.preventDefault();

                    if (self.clickable) {
                        var dotIndex = $(this).data('index');
                        if (dotIndex > index) {
                            dir = 'next';
                        } else {
                            dir = 'prev';
                        }
                        if (dotIndex != index) {
                            index = dotIndex;
                            self.moveTo(index, dir);
                        }
                    }
                });
            }

            if (self.options.arrShow) {
                //点击右箭头
                ele.find('.next').on('click', function (event) {
                    event.preventDefault();
                    if (index >= hwsliderSize) {
                        index = 1;
                    } else {
                        index += 1;
                    }
                    self.moveTo(index, 'next');

                });

                //点击左箭头
                ele.find(".prev").on('click', function (event) {
                    event.preventDefault();
                    if (index == 1) {
                        index = hwsliderSize;
                    } else {
                        index -= 1;
                    }

                    self.moveTo(index, 'prev');
                });
            }

            //自动滑动
            if (self.options.autoPlay) {
                var timer;
                var play = function () {
                    index++;
                    if (index > hwsliderSize) {
                        index = 1;
                    }
                    self.moveTo(index, 'next');
                }
                timer = setInterval(play, self.options.interval); //设置定时器
            }
            ;

            //触摸滑动
            if (self.options.touch) {
                hwsliderLi.on({
                    //触控开始
                    'touchstart': function (e) {
                        touchStartY = e.touches[0].clientY;
                        touchStartX = e.touches[0].clientX;
                    },

                    //触控结束
                    'touchend': function (e) {
                        var touchEndY = e.changedTouches[0].clientY,
                            touchEndX = e.changedTouches[0].clientX,
                            yDiff = touchStartY - touchEndY,
                            xDiff = touchStartX - touchEndX;


                        //判断滑动方向
                        if (Math.abs(xDiff) > Math.abs(yDiff)) {
                            if (xDiff > 5) {
                                if (index >= hwsliderSize) {
                                    index = 1;
                                } else {
                                    index += 1;
                                }
                                self.moveTo(index, 'next');
                            } else {
                                if (index == 1) {
                                    index = hwsliderSize;
                                } else {
                                    index -= 1;
                                }
                                self.moveTo(index, 'prev');
                            }
                        }
                        touchStartY = null;
                        touchStartX = null;
                    },

                    //触控移动
                    'touchmove': function (e) {
                        if (e.preventDefault) {
                            e.preventDefault();
                        }

                    }
                });
            }
        },

        //滑动移动
        moveTo: function (index, dir) {
            var self = this,
                ele = self.$element;
            var dots = ele.find(".dots span");
            var sliderInder = ele.children('ul');
            var hwsliderLi = sliderInder.children('li');
            var hwsliderSize = hwsliderLi.length;
            if (dir == 'next') {
                //当前滑块动画
                hwsliderLi.removeAttr('class').css('display', 'none');
                hwsliderLi.eq(index - hwsliderSize).addClass('moveout_right').css('display', 'block');

                //下一个滑块动画
                hwsliderLi.removeClass('active').eq(index - 1).addClass('movein_right').css('display', 'block');

            } else {
                //当前滑块动画
                hwsliderLi.removeAttr('class').css('display', 'none');
                hwsliderLi.eq(index - hwsliderSize).addClass('moveout_left').css('display', 'block');

                //下一个滑块动画
                hwsliderLi.removeClass('active').eq(index - 1).addClass('movein_left').css('display', 'block');

            }
            //self.clickable = true;
            //显示可切换的圆点
            dots.removeClass('active');
            dots.eq(index - 1).addClass('active');


        }

    }


    $.fn.hwSlider = function (options) {
        var hwSlider = new HwSlider(this, options);
        return this.each(function () {
            hwSlider.init();
        });
    };
})(Zepto, window, document);