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//fgnass.github.com/spin.js#v1.3.2

/**
 * Copyright (c) 2011-2013 Felix Gnass
 * Licensed under the MIT license
 */
 (function(root, factory) {

    /* CommonJS */
    if (typeof exports == 'object') module.exports = factory()

    /* AMD module */
    else if (typeof define == 'function' && define.amd) define(factory)

    /* Browser global */
    else root.Spinner = factory()
}
(this, function() {
    "use strict";

    var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
    ,
        animations = {} /* Animation rules keyed by their name */
        ,
        useCssAnimations /* Whether to use CSS animations or setTimeout */

        /**
         * Utility function to create elements. If no tag name is given,
         * a DIV is created. Optionally properties can be passed.
         */
        function createEl(tag, prop) {
            var el = document.createElement(tag || 'div'),
                n

            for (n in prop) el[n] = prop[n]
            return el
        }

        /**
         * Appends children and returns the parent.
         */
        function ins(parent /* child1, child2, ...*/ ) {
            for (var i = 1, n = arguments.length; i < n; i++)
            parent.appendChild(arguments[i])

            return parent
        }

        /**
         * Insert a new stylesheet to hold the @keyframe or VML rules.
         */
    var sheet = (function() {
        var el = createEl('style', {
            type: 'text/css'
        })
        ins(document.getElementsByTagName('head')[0], el)
        return el.sheet || el.styleSheet
    }())

    /**
     * Creates an opacity keyframe animation rule and returns its name.
     * Since most mobile Webkits have timing issues with animation-delay,
     * we create separate rules for each line/segment.
     */
        function addAnimation(alpha, trail, i, lines) {
            var name = ['opacity', trail, ~~ (alpha * 100), i, lines].join('-'),
                start = 0.01 + i / lines * 100,
                z = Math.max(1 - (1 - alpha) / trail * (100 - start), alpha),
                prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase(),
                pre = prefix && '-' + prefix + '-' || ''

            if (!animations[name]) {
                sheet.insertRule('@' + pre + 'keyframes ' + name + '{' + '0%{opacity:' + z + '}' + start + '%{opacity:' + alpha + '}' + (start + 0.01) + '%{opacity:1}' + (start + trail) % 100 + '%{opacity:' + alpha + '}' + '100%{opacity:' + z + '}' + '}', sheet.cssRules.length)

                animations[name] = 1
            }

            return name
        }

        /**
         * Tries various vendor prefixes and returns the first supported property.
         */
        function vendor(el, prop) {
            var s = el.style,
                pp, i

                prop = prop.charAt(0).toUpperCase() + prop.slice(1)
                for (i = 0; i < prefixes.length; i++) {
                    pp = prefixes[i] + prop
                    if (s[pp] !== undefined) return pp
                }
            if (s[prop] !== undefined) return prop
        }

        /**
         * Sets multiple style properties at once.
         */
        function css(el, prop) {
            for (var n in prop)
            el.style[vendor(el, n) || n] = prop[n]

            return el
        }

        /**
         * Fills in default values.
         */
        function merge(obj) {
            for (var i = 1; i < arguments.length; i++) {
                var def = arguments[i]
                for (var n in def)
                if (obj[n] === undefined) obj[n] = def[n]
            }
            return obj
        }

        /**
         * Returns the absolute page-offset of the given element.
         */
        function pos(el) {
            var o = {
                x: el.offsetLeft,
                y: el.offsetTop
            }
            while ((el = el.offsetParent))
            o.x += el.offsetLeft, o.y += el.offsetTop

            return o
        }

        /**
         * Returns the line color from the given string or array.
         */
        function getColor(color, idx) {
            return typeof color == 'string' ? color : color[idx % color.length]
        }

        // Built-in defaults

    var defaults = {
        lines: 12, // The number of lines to draw
        length: 7, // The length of each line
        width: 5, // The line thickness
        radius: 10, // The radius of the inner circle
        rotate: 0, // Rotation offset
        corners: 1, // Roundness (0..1)
        color: '#000', // #rgb or #rrggbb
        direction: 1, // 1: clockwise, -1: counterclockwise
        speed: 1, // Rounds per second
        trail: 100, // Afterglow percentage
        opacity: 1 / 4, // Opacity of the lines
        fps: 20, // Frames per second when using setTimeout()
        zIndex: 2e9, // Use a high z-index by default
        className: 'spinner', // CSS class to assign to the element
        top: 'auto', // center vertically
        left: 'auto', // center horizontally
        position: 'relative' // element position
    }

    /** The constructor */
        function Spinner(o) {
            if (typeof this == 'undefined') return new Spinner(o)
            this.opts = merge(o || {}, Spinner.defaults, defaults)
        }

        // Global defaults that override the built-ins:
        Spinner.defaults = {}

    merge(Spinner.prototype, {

        /**
         * Adds the spinner to the given target element. If this instance is already
         * spinning, it is automatically removed from its previous target b calling
         * stop() internally.
         */
        spin: function(target) {
            this.stop()

            var self = this,
                o = self.opts,
                el = self.el = css(createEl(0, {
                    className: o.className
                }), {
                    position: o.position,
                    width: 0,
                    zIndex: o.zIndex
                }),
                mid = o.radius + o.length + o.width,
                ep // element position
                ,
                tp // target position

            if (target) {
                target.insertBefore(el, target.firstChild || null)
                tp = pos(target)
                ep = pos(el)
                css(el, {
                    left: (o.left == 'auto' ? tp.x - ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
                    top: (o.top == 'auto' ? tp.y - ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px'
                })
            }

            el.setAttribute('role', 'progressbar')
            self.lines(el, self.opts)

            if (!useCssAnimations) {
                // No CSS animation support, use setTimeout() instead
                var i = 0,
                    start = (o.lines - 1) * (1 - o.direction) / 2,
                    alpha, fps = o.fps,
                    f = fps / o.speed,
                    ostep = (1 - o.opacity) / (f * o.trail / 100),
                    astep = f / o.lines

                    ;
                (function anim() {
                    i++;
                    for (var j = 0; j < o.lines; j++) {
                        alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)

                        self.opacity(el, j * o.direction + start, alpha, o)
                    }
                    self.timeout = self.el && setTimeout(anim, ~~ (1000 / fps))
                })()
            }
            return self
        },

        /**
         * Stops and removes the Spinner.
         */
        stop: function() {
            var el = this.el
            if (el) {
                clearTimeout(this.timeout)
                if (el.parentNode) el.parentNode.removeChild(el)
                this.el = undefined
            }
            return this
        },

        /**
         * Internal method that draws the individual lines. Will be overwritten
         * in VML fallback mode below.
         */
        lines: function(el, o) {
            var i = 0,
                start = (o.lines - 1) * (1 - o.direction) / 2,
                seg

                function fill(color, shadow) {
                    return css(createEl(), {
                        position: 'absolute',
                        width: (o.length + o.width) + 'px',
                        height: o.width + 'px',
                        background: color,
                        boxShadow: shadow,
                        transformOrigin: 'left',
                        transform: 'rotate(' + ~~ (360 / o.lines * i + o.rotate) + 'deg) translate(' + o.radius + 'px' + ',0)',
                        borderRadius: (o.corners * o.width >> 1) + 'px'
                    })
                }

            for (; i < o.lines; i++) {
                seg = css(createEl(), {
                    position: 'absolute',
                    top: 1 + ~ (o.width / 2) + 'px',
                    transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
                    opacity: o.opacity,
                    animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1 / o.speed + 's linear infinite'
                })

                if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {
                    top: 2 + 'px'
                }))
                ins(el, ins(seg, fill(getColor(o.color, i), '0 0 1px rgba(0,0,0,.1)')))
            }
            return el
        },

        /**
         * Internal method that adjusts the opacity of a single line.
         * Will be overwritten in VML fallback mode below.
         */
        opacity: function(el, i, val) {
            if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
        }

    })


    function initVML() {

        /* Utility function to create a VML tag */
        function vml(tag, attr) {
            return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
        }

        // No CSS transforms but VML support, add a CSS rule for VML elements:
        sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')

        Spinner.prototype.lines = function(el, o) {
            var r = o.length + o.width,
                s = 2 * r

                function grp() {
                    return css(
                    vml('group', {
                        coordsize: s + ' ' + s,
                        coordorigin: -r + ' ' + -r
                    }), {
                        width: s,
                        height: s
                    })
                }

            var margin = -(o.width + o.length) * 2 + 'px',
                g = css(grp(), {
                    position: 'absolute',
                    top: margin,
                    left: margin
                }),
                i

                function seg(i, dx, filter) {
                    ins(g,
                    ins(css(grp(), {
                        rotation: 360 / o.lines * i + 'deg',
                        left: ~~dx
                    }),
                    ins(css(vml('roundrect', {
                        arcsize: o.corners
                    }), {
                        width: r,
                        height: o.width,
                        left: o.radius,
                        top: -o.width >> 1,
                        filter: filter
                    }),
                    vml('fill', {
                        color: getColor(o.color, i),
                        opacity: o.opacity
                    }),
                    vml('stroke', {
                        opacity: 0
                    }) // transparent stroke to fix color bleeding upon opacity change
                    )))
                }

            if (o.shadow) for (i = 1; i <= o.lines; i++)
            seg(i, - 2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')

            for (i = 1; i <= o.lines; i++) seg(i)
            return ins(el, g)
        }

        Spinner.prototype.opacity = function(el, i, val, o) {
            var c = el.firstChild
            o = o.shadow && o.lines || 0
            if (c && i + o < c.childNodes.length) {
                c = c.childNodes[i + o];
                c = c && c.firstChild;
                c = c && c.firstChild
                if (c) c.opacity = val
            }
        }
    }

    var probe = css(createEl('group'), {
        behavior: 'url(#default#VML)'
    })

    if (!vendor(probe, 'transform') && probe.adj) initVML()
    else useCssAnimations = vendor(probe, 'animation')

    return Spinner

})); 
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