/**
 * SmallSilder JQuery plugin
 * http://lib.kindcent.com/smallslider
 * JQuery plugin for switch images, Please Open me with UTF-8 encoding
 * Created under Ubuntu 9.10 OS , if you open it with notepad.exe , some black squares will appear !
 * 这是一个源码开放程序，本人特意加上注释以方便大家修改，你可以自行修改，再发布，欢迎和我交流。
 * 0.5版本新增加actionGap延时选项，部分解决快速滑动时的闪烁问题。
 * 即鼠标放上面后，需要等待一段时间才开始切换，默认为200毫秒。
 * 不知何年何月才能算1.0版呢？因为我一直觉得切换的过渡效果还没有完全达到我的意志！
 *
 * Licensed under The MIT License
 *
 * @version    0.5
 * @since        2009-7-3, 11:56:24
 * @last           2010-12-6, 01:25:56
 * @author     Jesse <microji@163.com>
 */

/**
 * Usage:  $('#slider').smallslider({ onImageStop:true, switchEase: 'easeOutSine',switchPath: 'left'});
 *
 * @param elm 你想要使用的最外层
 * @param options 一些附加参数
 *
 * Valid options:
 * ---------------------------------------
 *  time:3000,                                  // 切换时间间隔，单位毫秒，1秒=1000毫秒
 *  autoStart:true,                         // 是否自动开始播放
 *  onImageStop : false ,             // 鼠标放在图片上时，是否停止播放
 *  switchMode:'hover',             // 图片切换的方式，click为单击切换，hover为鼠标移动到按钮上时切换
 *  switchEffect:'fadeOut',         // 切换特效,fadeOut, ease, none,
 *  switchPath: 'left' ,                 // 切换的方向，可选值为：up ， left ，即向上，向左
 *  switchEase : 'easeOutQuart' , // 可选值列表如下
 *  switchTime: 600,                    // 切换时间，单位毫秒，1秒=1000毫秒
 *  actionGap: 200,                     //[0.5版本新增]鼠标单击或移动触发切换，切换响应的时间间隔，0为立即响应，时间越大，响应越慢
 *  buttonPosition: 'rightBottom', // 按钮位置表示，共有四个值：leftTop，leftBottom, rightTop, rightBottom
 *  buttonOffsetX:10,               // 水平方向上的按钮偏移位置，指向中心部移动多少，这里是数值，不加px
 *  buttonOffsetY:4,                // 竖直方向上的按钮偏移位置，指向中心部移动多少，这里是数值，不加px
 *  buttonSpace:4,                  // 按钮之间的间隔 单位为像素，但不要加px
 *  showText: true,                 // 是否显示标题，如果不显示，则只显示按钮
 *  showButtons : true,         // 是否显示按钮，默认显示
 *  textLink : true,                // 是否给显示的标题加上链接，如果为false，则，只显示标题，标题不可单击，链接的地址自动和当前播放到的图片地址一致
 *  textSwitch : 0 ,            // 标题是否运动显示，如果为0则不动，1 标题动，2 标题和背景一起动。
 *  textPosition: '',		// 标题栏的位置，默认为空，即和按钮的位置一致，取值 top ,  bottom
 *  textAlign: ''		// 如果留空，则会默认和按钮位置的相反方向排列，取值：left, center, right
 */
(function ($) {

    $.smallslider = function (elm, options) {

        // this 为当前的smallslider对象，为了区别，使用 _this 替换
        var _this = this;
        _this.elm = elm;     // elm 为当前的 DOM对象 ，即使用class="smallslider" 的那个div对象。
        _this.$elm = $(elm);  // $elm 为elm对象的jquery形式 
        _this.opts = $.extend({}, $.smallslider.defaults, options);
        _this.sliderTimer = null;
        _this.actionGapTimer = null;
        _this.slideProcessing = false;
        // 初始化对象
        _this.init = function () {
            _this.$ul = _this.$elm.find('ul');  // 为子元素ul
            _this.$lis = _this.$elm.find('li');  // 为所有ul下子元素li 数组
            _this.$ims = _this.$elm.find('img');  // 为所有li下子元素img 数组
            _this.itemNums = _this.$lis.length;
            _this.width = _this.$elm.width();
            _this.height = _this.$elm.height();
            _this.current = 0; 		// 当前的index索引

            if (_this.itemNums > 1) {
                if (_this.opts.switchEffect == 'ease') {
                    _this.$ul.css({
                        position: 'absolute',
                        left: 0,
                        top: 0
                    });
                    if (_this.opts.switchPath == 'left') {
                        var width = _this.itemNums * _this.width;
                        _this.$lis.css({
                            'float': 'left'
                        });
                        _this.$ul.css({
                            'width': width
                        });
                    }
                    else if (_this.opts.switchPath == 'up') {
                        var height = _this.itemNums * _this.height;
                        _this.$ul.css({
                            'height': height
                        });
                    }
                }
                else if (_this.opts.switchEffect == 'fadeOut') {
                    _this.$ul.css({
                        position: 'relative'
                    });
                    _this.$lis.css({
                        position: 'absolute',
                        zIndex: 1
                    }).eq(0).css({
                        zIndex: 2
                    });
                }
                if (_this.opts.showButtons) {
                    _this.createButtons(); // 创建按钮。
                }
                if (_this.opts.showText) {
                    _this.createText(); // 创建文字显示。
                }
                if (_this.opts.autoStart) {
                    _this.startSlider(1);
                }
                if (_this.opts.onImageStop) {
                    _this.onImage();
                }
            }
        };
        _this.createButtons = function () {
            var buttons = '';
            for (var i = 1; i <= _this.itemNums; i++) {
                buttons += '<span>' + i + '</span>';
            }
            buttons = '<div class="smallslider-btns">' + buttons + '</div>';
            var left = 0, right = 0, top = 0, bottom = 0;
            var style_btns = {};
            switch (_this.opts.buttonPosition) {
                case 'leftTop':
                    left = _this.opts.buttonOffsetX;
                    top = _this.opts.buttonOffsetY;
                    style_btns = { left: left + 'px', top: top + 'px' };
                    break;
                case 'rightTop':
                    right = _this.opts.buttonOffsetX;
                    top = _this.opts.buttonOffsetY;
                    style_btns = { right: right + 'px', top: top + 'px' };
                    break;
                case 'rightBottom':
                    right = _this.opts.buttonOffsetX;
                    bottom = _this.opts.buttonOffsetY;
                    style_btns = { right: right + 'px', bottom: bottom + 'px' };
                    break;
                case 'leftBottom':
                    left = _this.opts.buttonOffsetX;
                    bottom = _this.opts.buttonOffsetY;
                    style_btns = { left: left + 'px', bottom: bottom + 'px' };
                    break;
            }
            $(buttons).css(style_btns).appendTo(_this.$elm);
            _this.$btns = _this.$elm.find('span');
            _this.$elm.find('span:not(:first)').css({ marginLeft: _this.opts.buttonSpace + 'px' });
            _this.$btns.removeClass('current-btn');
            _this.$btns.eq(0).addClass('current-btn');
            if (_this.opts.switchMode == 'click') {
                _this.$btns.click(function () {
                    var ix = _this.$btns.index($(this));
                    //_this.slideTo(ix); // 表示需要切换到哪一张
                    _this.actionSlide(ix);
                });
            } else if (_this.opts.switchMode == 'hover') {
                _this.$btns.hover(function () {
                    var ix = _this.$btns.index($(this));
                    //_this.slideTo(ix);
                    _this.actionSlide(ix);
                });
            }
        };

        _this.actionSlide = function (ix) {
            // console.log(_this.actionGapTimer);
            if (_this.actionGapTimer) {
                clearTimeout(_this.actionGapTimer);
                _this.actionGapTimer = null;
            }
            _this.actionGapTimer = setTimeout(function () { _this.slideTo(ix); }, _this.opts.actionGap);

        };
        // 创建标题标签
        _this.createText = function () {
            var style_tex = {};
            switch (_this.opts.buttonPosition) {
                case 'leftTop':
                    style_tex = { left: 0, top: 0, textAlign: 'right' };
                    _this.textPosition = 'top';
                    break;
                case 'rightTop':
                    style_tex = { left: 0, top: 0, textAlign: 'left' };
                    _this.textPosition = 'top';
                    break;
                case 'rightBottom':
                    style_tex = { left: 0, bottom: 0, textAlign: 'left' };
                    _this.textPosition = 'bottom';
                    break;
                case 'leftBottom':
                    style_tex = { left: 0, bottom: 0, textAlign: 'right' };
                    _this.textPosition = 'bottom';
                    break;
            }
            if (_this.opts.textPosition) {
                switch (_this.opts.textPosition) {
                    case 'top':
                        style_tex.left = 0; style_tex.top = 0;
                        break;
                    case 'bottom':
                        style_tex.left = 0; style_tex.bottom = 0;
                        break;
                }
                _this.textPosition = _this.opts.textPosition;
            }
            if (_this.opts.textAlign) {
                style_tex.textAlign = _this.opts.textAlign;
            }
            $('<div class="smallslider-tex smallslider-lay"></div>').css(style_tex).css({
			bottom: -2
            }).appendTo(_this.$elm);

            var tex0 = _this.$ims.eq(0).attr('alt');
            if (_this.opts.textLink) {
                tex0 = '<a href="' + _this.$ims.eq(0).parent('a').attr('href') + '">' + tex0 + '</a>';
            }
            $('<h3 class="smallslider-tex"></h3>').css(style_tex).html(tex0).appendTo(_this.$elm);
            _this.$h3 = _this.$elm.find('h3');
            _this.$lay = _this.$elm.find('div.smallslider-lay');
            _this.$tex = _this.$elm.find('.smallslider-tex');
        };
        _this.onImage = function () {
            _this.$ims.hover(function () {
                _this.stopSlider();
            }, function () {
                _this.slideTo(_this.current + 1);
            });
        };

        _this.slideTo = function (index) {
            _this.stopSlider(); // 先清掉以前的setTimeout;
            if (index > _this.itemNums - 1) index = 0;
            if (index < 0) index = _this.itemNums - 1;
            // 切换表示当前元素
            _this.$lis.removeClass('current-li').eq(index).addClass('current-li');
            if (_this.opts.showButtons) {
                _this.$btns.removeClass('current-btn');
                _this.$btns.eq(index).addClass('current-btn');
            }
            _this.slideText(index);
            var chAttr = '';
            var iC = 0;
            switch (_this.opts.switchPath) {
                case 'left':
                    chAttr = 'left';
                    iC = _this.width;
                    break;
                case 'up':
                default:
                    chAttr = 'top';
                    iC = _this.height;
                    break;
            }
            var iCx = -1 * index * iC; // Top或Left 变化量
            var switchEase = _this.opts.switchEase;
            switch (_this.opts.switchEffect) {
                case 'fadeOut':
                    if (_this.current != index) {
                        _this.slideProcessing = true;
                        _this.$lis.stop(true, false);
                        _this.$lis.css({ zIndex: 1, opacity: 1 }).hide();
                        _this.$lis.eq(_this.current).css({ zIndex: 3 }).show();
                        _this.$lis.eq(index).css({ zIndex: 2 }).show();
                        _this.$lis.eq(_this.current).fadeOut(_this.opts.switchTime, function () {
                            _this.$lis.css({ zIndex: 1 });
                            _this.$lis.eq(index).css({ zIndex: 3, opacity: 1 }).show();
                            _this.slideProcessing = false;
                        });
                    }
                    break;
                case 'ease':
                    _this.$ul.stop(true, false);
                    if (chAttr == 'top')
                        _this.$ul.animate({ top: iCx }, { duration: _this.opts.switchTime, easing: switchEase, complete: function () {
                        }
                        });
                    else if (chAttr == 'left')
                        _this.$ul.animate({ left: iCx }, { duration: _this.opts.switchTime, easing: switchEase, complete: function () {
                        }
                        });
                    break;
                case 'none':
                default:
                    _this.$lis.eq(_this.current).hide();
                    _this.$lis.eq(index).show();
                    break;
            }
            _this.current = index;
            _this.startSlider(index + 1);
        };

        // 切换文字
        _this.slideText = function (index) {
            if (_this.opts.showText) {
                var tex = _this.$ims.eq(index).attr('alt');
                if (_this.opts.textLink) {
                    tex = '<a href="' + _this.$ims.eq(index).parent('a').attr('href') + '">' + tex + '</a>';
                }
                _this.$h3.html(tex);
                if (_this.opts.textSwitch > 0) {
                    var t_path = _this.$h3.height();
                    var t_ani1 = {}, t_ani2 = {};
                    if (_this.textPosition == 'top') {
                        t_ani1 = { top: -1 * t_path };
                        t_ani2 = { top: 0 };
                    }
                    else if (_this.textPosition == 'bottom') {
                        t_ani1 = { bottom: -1 * t_path };
                        t_ani2 = { bottom: 0 };
                    }
                    if (_this.opts.textSwitch == 1) {
                        _this.$h3.stop(true, false).animate(t_ani1, { duration: 200, easing: 'easeOutQuad' }).animate(t_ani2, { duration: 200, easing: 'easeOutQuad' });
                    } else if (_this.opts.textSwitch == 2) {
                        _this.$tex.stop(true, false).animate(t_ani1, { duration: 200, easing: 'easeOutQuad' }).animate(t_ani2, { duration: 200, easing: 'easeOutQuad' });
                        //_this.$lay.animate(t_ani1, {duration: 200, easing: 'easeOutQuad'}).animate(t_ani2, {duration: 200, easing: 'easeOutQuad'});
                    }
                }
            }
        };

        // 开始切换
        _this.startSlider = function (index) {
            
            var st = setTimeout(function () { _this.slideTo(index); }, _this.opts.time);
            _this.sliderTimer = st;
        };
        // 停止切换
        _this.stopSlider = function () {
            //if(_this.opts.switchEffect=='fadeOut') _this.$lis.stop();
            //  else if(_this.opts.switchEffect=='ease') _this.$ul.stop();
            if (_this.sliderTimer) {
                clearTimeout(_this.sliderTimer);
            };
            _this.sliderTimer = null;
        };

        _this.init();
    };

    $.smallslider.defaults = {
        time: 3000,
        autoStart: true,
        onImageStop: false,
        switchMode: 'hover',
        switchEffect: 'fadeOut',
        switchPath: 'left',
        switchEase: 'easeOutQuart',
        switchTime: 600,
        actionGap: 200,
        buttonPosition: 'rightBottom',
        buttonOffsetX: 10,
        buttonOffsetY: 4,
        buttonSpace: 4,
        showText: false,
        showButtons: true,
        textLink: true,
        textSwitch: 0,
        textPosition: '',
        textAlign: ''
    };

    $.fn.smallslider = function (options) {
        // 遍历由$.smallslider类创建生成的smallslider对象。
        return this.each(function (i) {
            (new $.smallslider(this, options));
        });
    };

})(jQuery);

$.smallslider.switchEases = ["easeInQuad", "easeOutQuad", "easeInOutQuad", "easeInCubic", "easeOutCubic",
 "easeInOutCubic", "easeInQuart", "easeOutQuart", "easeInOutQuart", "easeInQuint", "easeOutQuint", "easeInOutQuint",
 "easeInSine", "easeOutSine", "easeInOutSine", "easeInExpo", "easeOutExpo", "easeInOutExpo", "easeInCirc", "easeOutCirc", "easeInOutCirc", "easeInElastic",
 "easeOutElastic", "easeInOutElastic", "easeInBack", "easeOutBack", "easeInOutBack",
 "easeInBounce", "easeOutBounce", "easeInOutBounce"];

// t: current time, b: begInnIng value, c: change In value, d: duration
jQuery.easing['jswing'] = jQuery.easing['swing'];

jQuery.extend( jQuery.easing,
{
	def: 'easeOutQuad',
	swing: function (x, t, b, c, d) {
		//alert(jQuery.easing.default);
		return jQuery.easing[jQuery.easing.def](x, t, b, c, d);
	},
	easeInQuad: function (x, t, b, c, d) {
		return c*(t/=d)*t + b;
	},
	easeOutQuad: function (x, t, b, c, d) {
		return -c *(t/=d)*(t-2) + b;
	},
	easeInOutQuad: function (x, t, b, c, d) {
		if ((t/=d/2) < 1) return c/2*t*t + b;
		return -c/2 * ((--t)*(t-2) - 1) + b;
	},
	easeInCubic: function (x, t, b, c, d) {
		return c*(t/=d)*t*t + b;
	},
	easeOutCubic: function (x, t, b, c, d) {
		return c*((t=t/d-1)*t*t + 1) + b;
	},
	easeInOutCubic: function (x, t, b, c, d) {
		if ((t/=d/2) < 1) return c/2*t*t*t + b;
		return c/2*((t-=2)*t*t + 2) + b;
	},
	easeInQuart: function (x, t, b, c, d) {
		return c*(t/=d)*t*t*t + b;
	},
	easeOutQuart: function (x, t, b, c, d) {
		return -c * ((t=t/d-1)*t*t*t - 1) + b;
	},
	easeInOutQuart: function (x, t, b, c, d) {
		if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
		return -c/2 * ((t-=2)*t*t*t - 2) + b;
	},
	easeInQuint: function (x, t, b, c, d) {
		return c*(t/=d)*t*t*t*t + b;
	},
	easeOutQuint: function (x, t, b, c, d) {
		return c*((t=t/d-1)*t*t*t*t + 1) + b;
	},
	easeInOutQuint: function (x, t, b, c, d) {
		if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
		return c/2*((t-=2)*t*t*t*t + 2) + b;
	},
	easeInSine: function (x, t, b, c, d) {
		return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
	},
	easeOutSine: function (x, t, b, c, d) {
		return c * Math.sin(t/d * (Math.PI/2)) + b;
	},
	easeInOutSine: function (x, t, b, c, d) {
		return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
	},
	easeInExpo: function (x, t, b, c, d) {
		return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
	},
	easeOutExpo: function (x, t, b, c, d) {
		return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
	},
	easeInOutExpo: function (x, t, b, c, d) {
		if (t==0) return b;
		if (t==d) return b+c;
		if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
		return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
	},
	easeInCirc: function (x, t, b, c, d) {
		return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
	},
	easeOutCirc: function (x, t, b, c, d) {
		return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
	},
	easeInOutCirc: function (x, t, b, c, d) {
		if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
		return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
	},
	easeInElastic: function (x, t, b, c, d) {
		var s=1.70158;var p=0;var a=c;
		if (t==0) return b;if ((t/=d)==1) return b+c;if (!p) p=d*.3;
		if (a < Math.abs(c)) {a=c;s=p/4;}
		else s = p/(2*Math.PI) * Math.asin (c/a);
		return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
	},
	easeOutElastic: function (x, t, b, c, d) {
		var s=1.70158;var p=0;var a=c;
		if (t==0) return b;if ((t/=d)==1) return b+c;if (!p) p=d*.3;
		if (a < Math.abs(c)) {a=c;s=p/4;}
		else s = p/(2*Math.PI) * Math.asin (c/a);
		return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
	},
	easeInOutElastic: function (x, t, b, c, d) {
		var s=1.70158;var p=0;var a=c;
		if (t==0) return b;if ((t/=d/2)==2) return b+c;if (!p) p=d*(.3*1.5);
		if (a < Math.abs(c)) {a=c;s=p/4;}
		else s = p/(2*Math.PI) * Math.asin (c/a);
		if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
		return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
	},
	easeInBack: function (x, t, b, c, d, s) {
		if (s == undefined) s = 1.70158;
		return c*(t/=d)*t*((s+1)*t - s) + b;
	},
	easeOutBack: function (x, t, b, c, d, s) {
		if (s == undefined) s = 1.70158;
		return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
	},
	easeInOutBack: function (x, t, b, c, d, s) {
		if (s == undefined) s = 1.70158;
		if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
		return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
	},
	easeInBounce: function (x, t, b, c, d) {
		return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b;
	},
	easeOutBounce: function (x, t, b, c, d) {
		if ((t/=d) < (1/2.75)) {
			return c*(7.5625*t*t) + b;
		} else if (t < (2/2.75)) {
			return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
		} else if (t < (2.5/2.75)) {
			return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
		} else {
			return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
		}
	},
	easeInOutBounce: function (x, t, b, c, d) {
		if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
		return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
	}
});