/*!
 * jQuery Transit - CSS3 transitions and transformations
 * (c) 2011-2012 Rico Sta. Cruz <rico@ricostacruz.com>
 * MIT Licensed.
 *
 * http://ricostacruz.com/jquery.transit
 * http://github.com/rstacruz/jquery.transit
 */

(function($) {
    $.transit = {
        version: "0.9.9",

        // Map of $.css() keys to values for 'transitionProperty'.
        // See https://developer.mozilla.org/en/CSS/CSS_transitions#Properties_that_can_be_animated
        propertyMap: {
            marginLeft    : 'margin',
            marginRight   : 'margin',
            marginBottom  : 'margin',
            marginTop     : 'margin',
            paddingLeft   : 'padding',
            paddingRight  : 'padding',
            paddingBottom : 'padding',
            paddingTop    : 'padding'
        },

        // Will simply transition "instantly" if false
        enabled: true,

        // Set this to false if you don't want to use the transition end property.
        useTransitionEnd: false
    };

    var div = document.createElement('div');
    var support = {};

    // Helper function to get the proper vendor property name.
    // (`transition` => `WebkitTransition`)
    function getVendorPropertyName(prop) {
        // Handle unprefixed versions (FF16+, for example)
        if (prop in div.style) return prop;

        var prefixes = ['Moz', 'Webkit', 'O', 'ms'];
        var prop_ = prop.charAt(0).toUpperCase() + prop.substr(1);

        if (prop in div.style) { return prop; }

        for (var i=0; i<prefixes.length; ++i) {
            var vendorProp = prefixes[i] + prop_;
            if (vendorProp in div.style) { return vendorProp; }
        }
    }

    // Helper function to check if transform3D is supported.
    // Should return true for Webkits and Firefox 10+.
    function checkTransform3dSupport() {
        div.style[support.transform] = '';
        div.style[support.transform] = 'rotateY(90deg)';
        return div.style[support.transform] !== '';
    }

    var isChrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;

    // Check for the browser's transitions support.
    support.transition      = getVendorPropertyName('transition');
    support.transitionDelay = getVendorPropertyName('transitionDelay');
    support.transform       = getVendorPropertyName('transform');
    support.transformOrigin = getVendorPropertyName('transformOrigin');
    support.transform3d     = checkTransform3dSupport();

    var eventNames = {
        'transition':       'transitionEnd',
        'MozTransition':    'transitionend',
        'OTransition':      'oTransitionEnd',
        'WebkitTransition': 'webkitTransitionEnd',
        'msTransition':     'MSTransitionEnd'
    };

    // Detect the 'transitionend' event needed.
    var transitionEnd = support.transitionEnd = eventNames[support.transition] || null;

    // Populate jQuery's `$.support` with the vendor prefixes we know.
    // As per [jQuery's cssHooks documentation](http://api.jquery.com/jQuery.cssHooks/),
    // we set $.support.transition to a string of the actual property name used.
    for (var key in support) {
        if (support.hasOwnProperty(key) && typeof $.support[key] === 'undefined') {
            $.support[key] = support[key];
        }
    }

    // Avoid memory leak in IE.
    div = null;

    // ## $.cssEase
    // List of easing aliases that you can use with `$.fn.transition`.
    $.cssEase = {
        '_default':       'ease',
        'in':             'ease-in',
        'out':            'ease-out',
        'in-out':         'ease-in-out',
        'snap':           'cubic-bezier(0,1,.5,1)',
        // Penner equations
        'easeOutCubic':   'cubic-bezier(.215,.61,.355,1)',
        'easeInOutCubic': 'cubic-bezier(.645,.045,.355,1)',
        'easeInCirc':     'cubic-bezier(.6,.04,.98,.335)',
        'easeOutCirc':    'cubic-bezier(.075,.82,.165,1)',
        'easeInOutCirc':  'cubic-bezier(.785,.135,.15,.86)',
        'easeInExpo':     'cubic-bezier(.95,.05,.795,.035)',
        'easeOutExpo':    'cubic-bezier(.19,1,.22,1)',
        'easeInOutExpo':  'cubic-bezier(1,0,0,1)',
        'easeInQuad':     'cubic-bezier(.55,.085,.68,.53)',
        'easeOutQuad':    'cubic-bezier(.25,.46,.45,.94)',
        'easeInOutQuad':  'cubic-bezier(.455,.03,.515,.955)',
        'easeInQuart':    'cubic-bezier(.895,.03,.685,.22)',
        'easeOutQuart':   'cubic-bezier(.165,.84,.44,1)',
        'easeInOutQuart': 'cubic-bezier(.77,0,.175,1)',
        'easeInQuint':    'cubic-bezier(.755,.05,.855,.06)',
        'easeOutQuint':   'cubic-bezier(.23,1,.32,1)',
        'easeInOutQuint': 'cubic-bezier(.86,0,.07,1)',
        'easeInSine':     'cubic-bezier(.47,0,.745,.715)',
        'easeOutSine':    'cubic-bezier(.39,.575,.565,1)',
        'easeInOutSine':  'cubic-bezier(.445,.05,.55,.95)',
        'easeInBack':     'cubic-bezier(.6,-.28,.735,.045)',
        'easeOutBack':    'cubic-bezier(.175, .885,.32,1.275)',
        'easeInOutBack':  'cubic-bezier(.68,-.55,.265,1.55)'
    };

    // ## 'transform' CSS hook
    // Allows you to use the `transform` property in CSS.
    //
    //     $("#hello").css({ transform: "rotate(90deg)" });
    //
    //     $("#hello").css('transform');
    //     //=> { rotate: '90deg' }
    //
    $.cssHooks['transit:transform'] = {
        // The getter returns a `Transform` object.
        get: function(elem) {
            return $(elem).data('transform') || new Transform();
        },

        // The setter accepts a `Transform` object or a string.
        set: function(elem, v) {
            var value = v;

            if (!(value instanceof Transform)) {
                value = new Transform(value);
            }

            // We've seen the 3D version of Scale() not work in Chrome when the
            // element being scaled extends outside of the viewport.  Thus, we're
            // forcing Chrome to not use the 3d transforms as well.  Not sure if
            // translate is affectede, but not risking it.  Detection code from
            // http://davidwalsh.name/detecting-google-chrome-javascript
            if (support.transform === 'WebkitTransform' && !isChrome) {
                elem.style[support.transform] = value.toString(true);
            } else {
                elem.style[support.transform] = value.toString();
            }

            $(elem).data('transform', value);
        }
    };

    // Add a CSS hook for `.css({ transform: '...' })`.
    // In jQuery 1.8+, this will intentionally override the default `transform`
    // CSS hook so it'll play well with Transit. (see issue #62)
    $.cssHooks.transform = {
        set: $.cssHooks['transit:transform'].set
    };

    // jQuery 1.8+ supports prefix-free transitions, so these polyfills will not
    // be necessary.
    if ($.fn.jquery < "1.8") {
        // ## 'transformOrigin' CSS hook
        // Allows the use for `transformOrigin` to define where scaling and rotation
        // is pivoted.
        //
        //     $("#hello").css({ transformOrigin: '0 0' });
        //
        $.cssHooks.transformOrigin = {
            get: function(elem) {
                return elem.style[support.transformOrigin];
            },
            set: function(elem, value) {
                elem.style[support.transformOrigin] = value;
            }
        };

        // ## 'transition' CSS hook
        // Allows you to use the `transition` property in CSS.
        //
        //     $("#hello").css({ transition: 'all 0 ease 0' });
        //
        $.cssHooks.transition = {
            get: function(elem) {
                return elem.style[support.transition];
            },
            set: function(elem, value) {
                elem.style[support.transition] = value;
            }
        };
    }

    // ## Other CSS hooks
    // Allows you to rotate, scale and translate.
    registerCssHook('scale');
    registerCssHook('translate');
    registerCssHook('rotate');
    registerCssHook('rotateX');
    registerCssHook('rotateY');
    registerCssHook('rotate3d');
    registerCssHook('perspective');
    registerCssHook('skewX');
    registerCssHook('skewY');
    registerCssHook('x', true);
    registerCssHook('y', true);

    // ## Transform class
    // This is the main class of a transformation property that powers
    // `$.fn.css({ transform: '...' })`.
    //
    // This is, in essence, a dictionary object with key/values as `-transform`
    // properties.
    //
    //     var t = new Transform("rotate(90) scale(4)");
    //
    //     t.rotate             //=> "90deg"
    //     t.scale              //=> "4,4"
    //
    // Setters are accounted for.
    //
    //     t.set('rotate', 4)
    //     t.rotate             //=> "4deg"
    //
    // Convert it to a CSS string using the `toString()` and `toString(true)` (for WebKit)
    // functions.
    //
    //     t.toString()         //=> "rotate(90deg) scale(4,4)"
    //     t.toString(true)     //=> "rotate(90deg) scale3d(4,4,0)" (WebKit version)
    //
    function Transform(str) {
        if (typeof str === 'string') { this.parse(str); }
        return this;
    }

    Transform.prototype = {
        // ### setFromString()
        // Sets a property from a string.
        //
        //     t.setFromString('scale', '2,4');
        //     // Same as set('scale', '2', '4');
        //
        setFromString: function(prop, val) {
            var args =
                (typeof val === 'string')  ? val.split(',') :
                    (val.constructor === Array) ? val :
                        [ val ];

            args.unshift(prop);

            Transform.prototype.set.apply(this, args);
        },

        // ### set()
        // Sets a property.
        //
        //     t.set('scale', 2, 4);
        //
        set: function(prop) {
            var args = Array.prototype.slice.apply(arguments, [1]);
            if (this.setter[prop]) {
                this.setter[prop].apply(this, args);
            } else {
                this[prop] = args.join(',');
            }
        },

        get: function(prop) {
            if (this.getter[prop]) {
                return this.getter[prop].apply(this);
            } else {
                return this[prop] || 0;
            }
        },

        setter: {
            // ### rotate
            //
            //     .css({ rotate: 30 })
            //     .css({ rotate: "30" })
            //     .css({ rotate: "30deg" })
            //     .css({ rotate: "30deg" })
            //
            rotate: function(theta) {
                this.rotate = unit(theta, 'deg');
            },

            rotateX: function(theta) {
                this.rotateX = unit(theta, 'deg');
            },

            rotateY: function(theta) {
                this.rotateY = unit(theta, 'deg');
            },

            // ### scale
            //
            //     .css({ scale: 9 })      //=> "scale(9,9)"
            //     .css({ scale: '3,2' })  //=> "scale(3,2)"
            //
            scale: function(x, y) {
                if (y === undefined) { y = x; }
                this.scale = x + "," + y;
            },

            // ### skewX + skewY
            skewX: function(x) {
                this.skewX = unit(x, 'deg');
            },

            skewY: function(y) {
                this.skewY = unit(y, 'deg');
            },

            // ### perspectvie
            perspective: function(dist) {
                this.perspective = unit(dist, 'px');
            },

            // ### x / y
            // Translations. Notice how this keeps the other value.
            //
            //     .css({ x: 4 })       //=> "translate(4px, 0)"
            //     .css({ y: 10 })      //=> "translate(4px, 10px)"
            //
            x: function(x) {
                this.set('translate', x, null);
            },

            y: function(y) {
                this.set('translate', null, y);
            },

            // ### translate
            // Notice how this keeps the other value.
            //
            //     .css({ translate: '2, 5' })    //=> "translate(2px, 5px)"
            //
            translate: function(x, y) {
                if (this._translateX === undefined) { this._translateX = 0; }
                if (this._translateY === undefined) { this._translateY = 0; }

                if (x !== null && x !== undefined) { this._translateX = unit(x, 'px'); }
                if (y !== null && y !== undefined) { this._translateY = unit(y, 'px'); }

                this.translate = this._translateX + "," + this._translateY;
            }
        },

        getter: {
            x: function() {
                return this._translateX || 0;
            },

            y: function() {
                return this._translateY || 0;
            },

            scale: function() {
                var s = (this.scale || "1,1").split(',');
                if (s[0]) { s[0] = parseFloat(s[0]); }
                if (s[1]) { s[1] = parseFloat(s[1]); }

                // "2.5,2.5" => 2.5
                // "2.5,1" => [2.5,1]
                return (s[0] === s[1]) ? s[0] : s;
            },

            rotate3d: function() {
                var s = (this.rotate3d || "0,0,0,0deg").split(',');
                for (var i=0; i<=3; ++i) {
                    if (s[i]) { s[i] = parseFloat(s[i]); }
                }
                if (s[3]) { s[3] = unit(s[3], 'deg'); }

                return s;
            }
        },

        // ### parse()
        // Parses from a string. Called on constructor.
        parse: function(str) {
            var self = this;
            str.replace(/([a-zA-Z0-9]+)\((.*?)\)/g, function(x, prop, val) {
                self.setFromString(prop, val);
            });
        },

        // ### toString()
        // Converts to a `transition` CSS property string. If `use3d` is given,
        // it converts to a `-webkit-transition` CSS property string instead.
        toString: function(use3d) {
            var re = [];

            for (var i in this) {
                if (this.hasOwnProperty(i)) {
                    // Don't use 3D transformations if the browser can't support it.
                    if ((!support.transform3d) && (
                        (i === 'rotateX') ||
                            (i === 'rotateY') ||
                            (i === 'perspective') ||
                            (i === 'transformOrigin'))) { continue; }

                    if (i[0] !== '_') {
                        if (use3d && (i === 'scale')) {
                            re.push(i + "3d(" + this[i] + ",1)");
                        } else if (use3d && (i === 'translate')) {
                            re.push(i + "3d(" + this[i] + ",0)");
                        } else {
                            re.push(i + "(" + this[i] + ")");
                        }
                    }
                }
            }

            return re.join(" ");
        }
    };

    function callOrQueue(self, queue, fn) {
        if (queue === true) {
            self.queue(fn);
        } else if (queue) {
            self.queue(queue, fn);
        } else {
            fn();
        }
    }

    // ### getProperties(dict)
    // Returns properties (for `transition-property`) for dictionary `props`. The
    // value of `props` is what you would expect in `$.css(...)`.
    function getProperties(props) {
        var re = [];

        $.each(props, function(key) {
            key = $.camelCase(key); // Convert "text-align" => "textAlign"
            key = $.transit.propertyMap[key] || $.cssProps[key] || key;
            key = uncamel(key); // Convert back to dasherized

            if ($.inArray(key, re) === -1) { re.push(key); }
        });

        return re;
    }

    // ### getTransition()
    // Returns the transition string to be used for the `transition` CSS property.
    //
    // Example:
    //
    //     getTransition({ opacity: 1, rotate: 30 }, 500, 'ease');
    //     //=> 'opacity 500ms ease, -webkit-transform 500ms ease'
    //
    function getTransition(properties, duration, easing, delay) {
        // Get the CSS properties needed.
        var props = getProperties(properties);

        // Account for aliases (`in` => `ease-in`).
        if ($.cssEase[easing]) { easing = $.cssEase[easing]; }

        // Build the duration/easing/delay attributes for it.
        var attribs = '' + toMS(duration) + ' ' + easing;
        if (parseInt(delay, 10) > 0) { attribs += ' ' + toMS(delay); }

        // For more properties, add them this way:
        // "margin 200ms ease, padding 200ms ease, ..."
        var transitions = [];
        $.each(props, function(i, name) {
            transitions.push(name + ' ' + attribs);
        });

        return transitions.join(', ');
    }

    // ## $.fn.transition
    // Works like $.fn.animate(), but uses CSS transitions.
    //
    //     $("...").transition({ opacity: 0.1, scale: 0.3 });
    //
    //     // Specific duration
    //     $("...").transition({ opacity: 0.1, scale: 0.3 }, 500);
    //
    //     // With duration and easing
    //     $("...").transition({ opacity: 0.1, scale: 0.3 }, 500, 'in');
    //
    //     // With callback
    //     $("...").transition({ opacity: 0.1, scale: 0.3 }, function() { ... });
    //
    //     // With everything
    //     $("...").transition({ opacity: 0.1, scale: 0.3 }, 500, 'in', function() { ... });
    //
    //     // Alternate syntax
    //     $("...").transition({
    //       opacity: 0.1,
    //       duration: 200,
    //       delay: 40,
    //       easing: 'in',
    //       complete: function() { /* ... */ }
    //      });
    //
    $.fn.transition = $.fn.transit = function(properties, duration, easing, callback) {
        var self  = this;
        var delay = 0;
        var queue = true;

        // Account for `.transition(properties, callback)`.
        if (typeof duration === 'function') {
            callback = duration;
            duration = undefined;
        }

        // Account for `.transition(properties, duration, callback)`.
        if (typeof easing === 'function') {
            callback = easing;
            easing = undefined;
        }

        // Alternate syntax.
        if (typeof properties.easing !== 'undefined') {
            easing = properties.easing;
            delete properties.easing;
        }

        if (typeof properties.duration !== 'undefined') {
            duration = properties.duration;
            delete properties.duration;
        }

        if (typeof properties.complete !== 'undefined') {
            callback = properties.complete;
            delete properties.complete;
        }

        if (typeof properties.queue !== 'undefined') {
            queue = properties.queue;
            delete properties.queue;
        }

        if (typeof properties.delay !== 'undefined') {
            delay = properties.delay;
            delete properties.delay;
        }

        // Set defaults. (`400` duration, `ease` easing)
        if (typeof duration === 'undefined') { duration = $.fx.speeds._default; }
        if (typeof easing === 'undefined')   { easing = $.cssEase._default; }

        duration = toMS(duration);

        // Build the `transition` property.
        var transitionValue = getTransition(properties, duration, easing, delay);

        // Compute delay until callback.
        // If this becomes 0, don't bother setting the transition property.
        var work = $.transit.enabled && support.transition;
        var i = work ? (parseInt(duration, 10) + parseInt(delay, 10)) : 0;

        // If there's nothing to do...
        if (i === 0) {
            var fn = function(next) {
                self.css(properties);
                if (callback) { callback.apply(self); }
                if (next) { next(); }
            };

            callOrQueue(self, queue, fn);
            return self;
        }

        // Save the old transitions of each element so we can restore it later.
        var oldTransitions = {};

        var run = function(nextCall) {
            var bound = false;

            // Prepare the callback.
            var cb = function() {
                if (bound) { self.unbind(transitionEnd, cb); }

                if (i > 0) {
                    self.each(function() {
                        this.style[support.transition] = (oldTransitions[this] || null);
                    });
                }

                if (typeof callback === 'function') { callback.apply(self); }
                if (typeof nextCall === 'function') { nextCall(); }
            };

            if ((i > 0) && (transitionEnd) && ($.transit.useTransitionEnd)) {
                // Use the 'transitionend' event if it's available.
                bound = true;
                self.bind(transitionEnd, cb);
            } else {
                // Fallback to timers if the 'transitionend' event isn't supported.
                window.setTimeout(cb, i);
            }

            // Apply transitions.
            self.each(function() {
                if (i > 0) {
                    this.style[support.transition] = transitionValue;
                }
                $(this).css(properties);
            });
        };

        // Defer running. This allows the browser to paint any pending CSS it hasn't
        // painted yet before doing the transitions.
        var deferredRun = function(next) {
            this.offsetWidth; // force a repaint
            run(next);
        };

        // Use jQuery's fx queue.
        callOrQueue(self, queue, deferredRun);

        // Chainability.
        return this;
    };

    function registerCssHook(prop, isPixels) {
        // For certain properties, the 'px' should not be implied.
        if (!isPixels) { $.cssNumber[prop] = true; }

        $.transit.propertyMap[prop] = support.transform;

        $.cssHooks[prop] = {
            get: function(elem) {
                var t = $(elem).css('transit:transform');
                return t.get(prop);
            },

            set: function(elem, value) {
                var t = $(elem).css('transit:transform');
                t.setFromString(prop, value);

                $(elem).css({ 'transit:transform': t });
            }
        };

    }

    // ### uncamel(str)
    // Converts a camelcase string to a dasherized string.
    // (`marginLeft` => `margin-left`)
    function uncamel(str) {
        return str.replace(/([A-Z])/g, function(letter) { return '-' + letter.toLowerCase(); });
    }

    // ### unit(number, unit)
    // Ensures that number `number` has a unit. If no unit is found, assume the
    // default is `unit`.
    //
    //     unit(2, 'px')          //=> "2px"
    //     unit("30deg", 'rad')   //=> "30deg"
    //
    function unit(i, units) {
        if ((typeof i === "string") && (!i.match(/^[\-0-9\.]+$/))) {
            return i;
        } else {
            return "" + i + units;
        }
    }

    // ### toMS(duration)
    // Converts given `duration` to a millisecond string.
    //
    //     toMS('fast')   //=> '400ms'
    //     toMS(10)       //=> '10ms'
    //
    function toMS(duration) {
        var i = duration;

        // Allow for string durations like 'fast'.
        if ($.fx.speeds[i]) { i = $.fx.speeds[i]; }

        return unit(i, 'ms');
    }

    // Export some functions for testable-ness.
    $.transit.getTransitionValue = getTransition;
})(jQuery);