/*
 * jQuery RefineSlide plugin v0.4.1
 * http://github.com/alexdunphy/refineslide
 * Requires: jQuery v1.8+
 * MIT License (http://www.opensource.org/licenses/mit-license.php)
 */

 ;(function ($, window, document) {
    'use strict';

	// Baked-in settings for extension
	var defaults = {
        maxWidth              : 800,      // Max slider width - should be set to image width
        transition            : 'sliceH',  // String (default 'cubeV'): Transition type ('custom', random', 'cubeH', 'cubeV', 'fade', 'sliceH', 'sliceV', 'slideH', 'slideV', 'scale', 'blockScale', 'kaleidoscope', 'fan', 'blindH', 'blindV')
        customTransitions     : [],
        fallback3d            : 'sliceV', // String (default 'sliceV'): Fallback for browsers that support transitions, but not 3d transforms (only used if primary transition makes use of 3d-transforms)
        perspective           : 1000,     // Perspective (used for 3d transforms)
        useThumbs             : true,     // Bool (default true): Navigation type thumbnails
        useArrows             : false,    // Bool (default false): Navigation type previous and next arrows
        thumbMargin           : 3,        // Int (default 3): Percentage width of thumb margin
        autoPlay              : false,    // Int (default false): Auto-cycle slider
        delay                 : 5000,     // Int (default 5000) Time between slides in ms
        transitionDuration    : 800,      // Int (default 800): Transition length in ms
        startSlide            : 0,        // Int (default 0): First slide
        keyNav                : true,     // Bool (default true): Use left/right arrow keys to switch slide
        captionWidth          : 50,       // Int (default 50): Percentage of slide taken by caption
        arrowTemplate         : '<div class="rs-arrows"><a href="#" class="rs-prev"></a><a href="#" class="rs-next"></a></div>', // String: The markup used for arrow controls (if arrows are used). Must use classes '.rs-next' & '.rs-prev'
        onInit                : function () {}, // Func: User-defined, fires with slider initialisation
        onChange              : function () {}, // Func: User-defined, fires with transition start
        afterChange           : function () {}  // Func: User-defined, fires after transition end
	};

	// RS (RefineSlide) object constructor
	function RS(elem, settings) {
		this.$slider            = $(elem).addClass('rs-slider');      // Elem: Slider element
		this.settings           = $.extend({}, defaults, settings);    // Obj: Merged user settings/defaults
		this.$slides            = this.$slider.find('> li');           // Elem Arr: Slide elements
		this.totalSlides        = this.$slides.length;                 // Int: Number of slides
		this.cssTransitions     = testBrowser.cssTransitions();        // Bool: Test for CSS transition support
		this.cssTransforms3d    = testBrowser.cssTransforms3d();       // Bool: Test for 3D transform support
		this.currentPlace       = this.settings.startSlide;         // Int: Index of current slide (starts at 0)
		this.$currentSlide      = this.$slides.eq(this.currentPlace);  // Elem: Starting slide
		this.inProgress         = false;                               // Bool: Prevents overlapping transitions
		this.$sliderWrap        = this.$slider.wrap('<div class="rs-wrap" />').parent();      // Elem: Slider wrapper div
		this.$sliderBG          = this.$slider.wrap('<div class="rs-slide-bg" />').parent();  // Elem: Slider background (useful for styling & essential for cube transitions)
		this.settings.slider = this;  // Make slider object accessible to client call code with 'this.slider' (there's probably a better way to do this)

		this.init();
	}

	RS.prototype = {
        cycling: null,
        $slideImages: null,

        init: function () {
            // User-defined function to fire on slider initialisation
            this.settings.onInit();

            // Setup captions
            this.captions();

            if(this.settings.transition === 'custom') {
                this.nextAnimIndex = -1; // Set animation index for custom animation
            }

            if (this.settings.useArrows) {
                this.setArrows(); // Setup arrow navigation
            }

            if (this.settings.keyNav) {
                this.setKeys(); // Setup keyboard navigation
            }

            for (var i = 0; i < this.totalSlides; i++) { // Add slide identifying classes
                this.$slides.eq(i).addClass('rs-slide-' + i);
            }

            if (this.settings.autoPlay) {
                this.setAutoPlay();

                // Listen for slider mouseover
                this.$slider.on({
                    mouseenter: $.proxy(function () {
                        if (this.cycling !== null) {
                            clearTimeout(this.cycling);
                        }
                    }, this),
                    mouseleave: $.proxy(this.setAutoPlay, this) // Resume slideshow
                });
            }

            // Get the first image in each slide <li>
            this.$slideImages = this.$slides.find('img:eq(0)').addClass('rs-slide-image');

            this.setup();
        }

        ,setup: function () {
            this.$sliderWrap.css('width', this.settings.maxWidth);

            if (this.settings.useThumbs) {
                this.setThumbs();
            }

            // Display first slide
            this.$currentSlide.css({'opacity' : 1, 'z-index' : 2});
        }

        ,setArrows:function () {
            var that = this;

            // Append user-defined arrow template (elems) to '.rs-wrap' elem
            this.$sliderWrap.append(this.settings.arrowTemplate);

            // Fire next() method when clicked
            $('.rs-next', this.$sliderWrap).on('click', function (e) {
                e.preventDefault();
                that.next();
            });

            // Fire prev() method when clicked
            $('.rs-prev', this.$sliderWrap).on('click', function (e) {
                e.preventDefault();
                that.prev();
            });
        }

        ,next: function () {
            if (this.settings.transition === 'custom') {
                this.nextAnimIndex++;
            }

            // If on final slide, loop back to first slide
            if (this.currentPlace === this.totalSlides - 1) {
                this.transition(0, true); // Call transition
            } else {
                this.transition(this.currentPlace + 1, true); // Call transition
            }
        }

        ,prev: function () {
            if (this.settings.transition === 'custom') {
                this.nextAnimIndex--;
            }

            // If on first slide, loop round to final slide
            if (this.currentPlace == 0) {
                this.transition(this.totalSlides - 1, false); // Call transition
            } else {
                this.transition(this.currentPlace - 1, false); // Call transition
            }
        }

        ,setKeys: function () {
            var that = this;

            // Bind keyboard left/right arrows to next/prev methods
            $(document).on('keydown', function (e) {
                if (e.keyCode === 39) { // Right arrow key
                    that.next();
                } else if (e.keyCode === 37) { // Left arrow key
                    that.prev();
                }
            });
        }

        ,setAutoPlay: function () {
            var that = this;

            // Set timeout to object property so it can be accessed/cleared externally
            this.cycling = setTimeout(function () {
                that.next();
            }, this.settings.delay);
        }

        ,setThumbs: function () {
            var that = this,
                // Set percentage width (minus user-defined margin) to span width of slider
                width = (100 - ((this.totalSlides - 1) * this.settings.thumbMargin)) / this.totalSlides + '%';

            //<Wrapper to contain thumbnails
            this.$thumbWrap = $('<div class="rs-thumb-wrap" />').appendTo(this.$sliderWrap);

            // Loop to apply thumbnail widths/margins to <a> wraps, appending an image clone to each
            for (var i = 0; i < this.totalSlides; i++) {
                var $thumb = $('<a />')
                    .css({
                        width : width,
                        marginLeft : this.settings.thumbMargin + '%'
                    })
                    .attr('href', '#')
                    .data('rs-num', i);

                this.$slideImages.eq(i).clone()
                    .removeAttr('style')
                    .appendTo(this.$thumbWrap)
                    .wrap($thumb);
            }

            this.$thumbWrapLinks = this.$thumbWrap.find('a');

            // Safety margin to stop IE7 wrapping the thumbnails (no visual effect in other browsers)
            this.$thumbWrap.children().last().css('margin-right', -10);

            // Add active class to starting slide's respective thumb
            this.$thumbWrapLinks.eq(this.settings.startSlide).addClass('active');

            // Listen for click events on thumnails
            this.$thumbWrap.on('click', 'a', function (e) {
                e.preventDefault();

                that.transition(parseInt($(this).data('rs-num'))); // Call transition using identifier from thumb class
            });
        }

        ,captions: function() {
            var that = this,
                $captions = this.$slides.find('.rs-caption');

            // User-defined caption width
            $captions.css({
                width: that.settings.captionWidth + '%',
                opacity: 0
            });

            // Display starting slide's caption
            this.$currentSlide.find('.rs-caption').css('opacity', 1);

            $captions.each(function() {
                $(this).css({
                    transition: 'opacity ' + that.settings.transitionDuration + 'ms linear',
                    backfaceVisibility: 'hidden'
                });
            });
        }

        ,transition: function (slideNum, forward) {
            // If inProgress flag is not set (i.e. if not mid-transition)
            if (!this.inProgress) {
                // If not already on requested slide
                if (slideNum !== this.currentPlace) {
                    // Check whether the requested slide index is ahead or behind in the array (if not passed in as param)
                    if (typeof forward === 'undefined') {
                    	forward = slideNum > this.currentPlace ? true : false;
                    }

                    // If thumbnails exist, revise active class states
                    if (this.settings.useThumbs) {
                        this.$thumbWrapLinks.eq(this.currentPlace).removeClass('active');
                        this.$thumbWrapLinks.eq(slideNum).addClass('active');
                    }

                    // Assign next slide prop (elem)
                    this.$nextSlide = this.$slides.eq(slideNum);

                    // Assign next slide index prop (int)
                    this.currentPlace = slideNum;

                    // User-defined function, fires with transition
                    this.settings.onChange();

                    // Instantiate new Transition object, passing in self (RS obj), transition type (string), direction (bool)
                    new Transition(this, this.settings.transition, forward);
                }
            }
        }
    };

	// Transition object constructor
	function Transition(RS, transition, forward) {
		this.RS = RS; // RS (RefineSlide) object
		this.RS.inProgress = true; // Set RS inProgress flag to prevent additional Transition objects being instantiated until transition end
		this.forward = forward; // Bool: true for forward, false for backward
		this.transition = transition; // String: name of transition requested

        if (this.transition === 'custom') {
            this.customAnims = this.RS.settings.customTransitions;
            this.isCustomTransition = true;
        }

        // Remove incorrect specified elements from customAnims array.
        if (this.transition === 'custom') {
            var that = this;
            $.each(this.customAnims, function (i, obj) {
                if ($.inArray(obj, that.anims) === -1) {
                    that.customAnims.splice(i, 1);
                }
            });
        }

        this.fallback3d = this.RS.settings.fallback3d; // String: fallback to use when 3D transforms aren't supported

		this.init(); // Call Transition initialisation method
	}

	// Transition object Prototype
	Transition.prototype = {
        // Fallback to use if CSS transitions are unsupported
        fallback: 'fade'

        // Array of possible animations
        ,anims: ['cubeH', 'cubeV', 'fade', 'sliceH', 'sliceV', 'slideH', 'slideV', 'scale', 'blockScale', 'kaleidoscope', 'fan', 'blindH', 'blindV']

        ,customAnims: []

        ,init: function () {
            // Call requested transition method
            this[this.transition]();
        }

        ,before: function (callback) {
            var that = this;

            // Prepare slide opacity & z-index
            this.RS.$currentSlide.css('z-index', 2);
            this.RS.$nextSlide.css({'opacity' : 1, 'z-index' : 1});

            // Fade out/in captions with CSS/JS depending on browser capability
            if (this.RS.cssTransitions) {
                this.RS.$currentSlide.find('.rs-caption').css('opacity', 0);
                this.RS.$nextSlide.find('.rs-caption').css('opacity', 1);
            } else {
                this.RS.$currentSlide.find('.rs-caption').animate({'opacity' : 0}, that.RS.settings.transitionDuration);
                this.RS.$nextSlide.find('.rs-caption').animate({'opacity' : 1}, that.RS.settings.transitionDuration);
            }

            // Check if transition describes a setup method
            if (typeof this.setup === 'function') {
                // Setup required by transition
                var transition = this.setup();

                setTimeout(function () {
                    callback(transition);
                }, 20);
            } else {
                // Transition execution
                this.execute();
            }

            // Listen for CSS transition end on elem (set by transition)
            if (this.RS.cssTransitions) {
                $(this.listenTo).one('webkitTransitionEnd transitionend otransitionend oTransitionEnd mstransitionend', $.proxy(this.after, this));
            }
        }

        ,after: function () {
            // Reset transition CSS
            this.RS.$sliderBG.removeAttr('style');
            this.RS.$slider.removeAttr('style');
            this.RS.$currentSlide.removeAttr('style');
            this.RS.$nextSlide.removeAttr('style');
            this.RS.$currentSlide.css({
                zIndex: 1,
                opacity: 0
            });
            this.RS.$nextSlide.css({
                zIndex: 2,
                opacity : 1
            });

            // Additional reset steps required by transition (if any exist)
            if (typeof this.reset === 'function') {
                this.reset();
            }

            // If slideshow is active, reset the timeout
            if (this.RS.settings.autoPlay) {
                clearTimeout(this.RS.cycling);
                this.RS.setAutoPlay();
            }

            // Assign new slide position
            this.RS.$currentSlide = this.RS.$nextSlide;

            // Remove RS obj inProgress flag (i.e. allow new Transition to be instantiated)
            this.RS.inProgress = false;

            // User-defined function, fires after transition has ended
            this.RS.settings.afterChange();
        }

        ,fade: function () {
            var that = this;

            // If CSS transitions are supported by browser
            if (this.RS.cssTransitions) {
                // Setup steps
                this.setup = function () {
                    // Set event listener to next slide elem
                    that.listenTo = that.RS.$currentSlide;

                    that.RS.$currentSlide.css('transition', 'opacity ' + that.RS.settings.transitionDuration + 'ms linear');
                };

                // Execution steps
                this.execute = function () {
                    // Display next slide over current slide
                    that.RS.$currentSlide.css('opacity', 0);
                }
            } else { // JS animation fallback
                this.execute = function () {
                    that.RS.$currentSlide.animate({'opacity' : 0}, that.RS.settings.transitionDuration, function () {
                        // Reset steps
                        that.after();
                    });
                }
            }

            this.before($.proxy(this.execute, this));
        }

        // cube() method is used by cubeH() & cubeV() - not for calling directly
        ,cube: function (tz, ntx, nty, nrx, nry, wrx, wry) { // Args: translateZ, (next slide) translateX, (next slide) translateY, (next slide) rotateX, (next slide) rotateY, (wrap) rotateX, (wrap) rotateY
            // Fallback if browser does not support 3d transforms/CSS transitions
            if (!this.RS.cssTransitions || !this.RS.cssTransforms3d) {
                return this[this['fallback3d']](); // User-defined transition
            }

            var that = this;

            // Setup steps
            this.setup = function () {
                // Set event listener to '.rs-slider' <ul>
                that.listenTo = that.RS.$slider;

                this.RS.$sliderBG.css('perspective', 1000);

                // props for slide <li>s
                that.RS.$currentSlide.css({
                    transform : 'translateZ(' + tz + 'px)',
                    backfaceVisibility : 'hidden'
                });

                // props for next slide <li>
                that.RS.$nextSlide.css({
                    opacity : 1,
                    backfaceVisibility : 'hidden',
                    transform : 'translateY(' + nty + 'px) translateX(' + ntx + 'px) rotateY('+ nry +'deg) rotateX('+ nrx +'deg)'
                });

                // props for slider <ul>
                that.RS.$slider.css({
                    transform: 'translateZ(-' + tz + 'px)',
                    transformStyle: 'preserve-3d'
                });
            };

            // Execution steps
            this.execute = function () {
                that.RS.$slider.css({
                    transition: 'all ' + that.RS.settings.transitionDuration + 'ms ease-in-out',
                    transform: 'translateZ(-' + tz + 'px) rotateX('+ wrx +'deg) rotateY('+ wry +'deg)'
                });
            };

            this.before($.proxy(this.execute, this));
        }

        ,cubeH: function () {
            // Set to half of slide width
            var dimension = $(this.RS.$slides).width() / 2;

            // If next slide is ahead in array
            if (this.forward) {
                this.cube(dimension, dimension, 0, 0, 90, 0, -90);
            } else {
                this.cube(dimension, -dimension, 0, 0, -90, 0, 90);
            }
        }

        ,cubeV: function () {
            // Set to half of slide height
            var dimension = $(this.RS.$slides).height() / 2;

            // If next slide is ahead in array
            if (this.forward) {
                this.cube(dimension, 0, -dimension, 90, 0, -90, 0);
            } else {
                this.cube(dimension, 0, dimension, -90, 0, 90, 0);
            }
        }

        // grid() method is used by many transitions - not for calling directly
        // Grid calculations are based on those in the awesome flux slider (joelambert.co.uk/flux)
        ,grid: function (cols, rows, ro, tx, ty, sc, op) { // Args: columns, rows, rotate, translateX, translateY, scale, opacity
            // Fallback if browser does not support CSS transitions
            if (!this.RS.cssTransitions) {
                return this[this['fallback']]();
            }

            var that = this;

            // Setup steps
            this.setup = function () {
                // The time (in ms) added to/subtracted from the delay total for each new gridlet
                var count = (that.RS.settings.transitionDuration) / (cols + rows);

                // Gridlet creator (divisions of the image grid, positioned with background-images to replicate the look of an entire slide image when assembled)
                function gridlet(width, height, top, left, src, imgWidth, imgHeight, c, r) {
                    var delay = (c + r) * count;

                    // Return a gridlet elem with styles for specific transition
                    return $('<div class="rs-gridlet" />').css({
                        width : width,
                        height : height,
                        top : top,
                        left : left,
                        backgroundImage : 'url(' + src + ')',
                        backgroundPosition : '-' + left + 'px -' + top + 'px',
                        backgroundSize : imgWidth + 'px ' + imgHeight + 'px',
                        transition : 'all ' + that.RS.settings.transitionDuration + 'ms ease-in-out ' + delay + 'ms',
                        transform : 'none'
                    });
                }

                // Get the next slide's image
                that.$img = that.RS.$currentSlide.find('img.rs-slide-image');

                // Create a grid to hold the gridlets
                that.$grid = $('<div />').addClass('rs-grid');

                // Prepend the grid to the next slide (i.e. so it's above the slide image)
                that.RS.$currentSlide.prepend(that.$grid);

                // vars to calculate positioning/size of gridlets
                var imgWidth = that.$img.width(),
                    imgHeight = that.$img.height(),
                    imgSrc = that.$img.attr('src'),
                    colWidth = Math.floor(imgWidth / cols),
                    rowHeight = Math.floor(imgHeight / rows),
                    colRemainder = imgWidth - (cols * colWidth),
                    colAdd = Math.ceil(colRemainder / cols),
                    rowRemainder = imgHeight - (rows * rowHeight),
                    rowAdd = Math.ceil(rowRemainder / rows),
                    leftDist = 0;

                // tx/ty args can be passed as 'auto'/'min-auto' (meaning use slide width/height or negative slide width/height)
                tx = tx === 'auto' ? imgWidth : tx;
                tx = tx === 'min-auto' ? - imgWidth : tx;
                ty = ty === 'auto' ? imgHeight : ty;
                ty = ty === 'min-auto' ? - imgHeight : ty;

                // Loop through cols
                for (var i = 0; i < cols; i++) {
                    var topDist = 0,
                        newColWidth = colWidth;

                    // If imgWidth (px) does not divide cleanly into the specified number of cols, adjust individual col widths to create correct total
                    if (colRemainder > 0) {
                        var add = colRemainder >= colAdd ? colAdd : colRemainder;
                        newColWidth += add;
                        colRemainder -= add;
                    }

                    // Nested loop to create row gridlets for each col
                    for (var j = 0; j < rows; j++)  {
                        var newRowHeight = rowHeight,
                            newRowRemainder = rowRemainder;

                        // If imgHeight (px) does not divide cleanly into the specified number of rows, adjust individual row heights to create correct total
                        if (newRowRemainder > 0) {
                            add = newRowRemainder >= rowAdd ? rowAdd : rowRemainder;
                            newRowHeight += add;
                            newRowRemainder -= add;
                        }

                        // Create & append gridlet to grid
                        that.$grid.append(gridlet(newColWidth, newRowHeight, topDist, leftDist, imgSrc, imgWidth, imgHeight, i, j));

                        topDist += newRowHeight;
                    }

                    leftDist += newColWidth;
                }

                // Set event listener on last gridlet to finish transitioning
                that.listenTo = that.$grid.children().last();

                // Show grid & hide the image it replaces
                that.$grid.show();
                that.$img.css('opacity', 0);

                // Add identifying classes to corner gridlets (useful if applying border radius)
                that.$grid.children().first().addClass('rs-top-left');
                that.$grid.children().last().addClass('rs-bottom-right');
                that.$grid.children().eq(rows - 1).addClass('rs-bottom-left');
                that.$grid.children().eq(- rows).addClass('rs-top-right');
            };

            // Execution steps
            this.execute = function () {
                that.$grid.children().css({
                    opacity: op,
                    transform: 'rotate('+ ro +'deg) translateX('+ tx +'px) translateY('+ ty +'px) scale('+ sc +')'
                });
            };

            this.before($.proxy(this.execute, this));

            // Reset steps
            this.reset = function () {
                that.$img.css('opacity', 1);
                that.$grid.remove();
            }
        }

        ,sliceH: function () {
            this.grid(1, 8, 0, 'min-auto', 0, 1, 0);
        }

        ,sliceV: function () {
            this.grid(10, 1, 0, 0, 'auto', 1, 0);
        }

        ,slideV: function () {
            var dir = this.forward ?
                'min-auto' :
                'auto';

            this.grid(1, 1, 0, 0, dir, 1, 1);
        }

        ,slideH: function () {
            var dir = this.forward ?
                'min-auto' :
                'auto';

            this.grid(1, 1, 0, dir, 0, 1, 1);
        }

        ,scale: function () {
            this.grid(1, 1, 0, 0, 0, 1.5, 0);
        }

        ,blockScale: function () {
            this.grid(8, 6, 0, 0, 0, .6, 0);
        }

        ,kaleidoscope: function () {
            this.grid(10, 8, 0, 0, 0, 1, 0);
        }

        ,fan: function () {
            this.grid(1, 10, 45, 100, 0, 1, 0);
        }

        ,blindV: function () {
            this.grid(1, 8, 0, 0, 0, .7, 0);
        }

        ,blindH: function () {
            this.grid(10, 1, 0, 0, 0, .7, 0);
        }

        ,random: function () {
            // Pick a random transition from the anims array (obj prop)
            this[this.anims[Math.floor(Math.random() * this.anims.length)]]();
        }

        ,custom: function() {
            if (this.RS.nextAnimIndex < 0) {
                this.RS.nextAnimIndex = this.customAnims.length - 1;
            }
            if (this.RS.nextAnimIndex === this.customAnims.length) {
                this.RS.nextAnimIndex = 0;
            }

            // Pick the next item in the list of transitions provided by user.
            this[this.customAnims[this.RS.nextAnimIndex]]();
        }
    };

	// Obj to check browser capabilities
	var testBrowser = {
        // Browser vendor CSS prefixes
        browserVendors: ['', '-webkit-', '-moz-', '-ms-', '-o-', '-khtml-']

        // Browser vendor DOM prefixes
        ,domPrefixes: ['', 'Webkit', 'Moz', 'ms', 'O', 'Khtml']

        // Method to iterate over a property (using all DOM prefixes)
        // Returns true if prop is recognised by browser (else returns false)
        ,testDom: function (prop) {
            var i = this.domPrefixes.length;

            while (i--) {
                if (typeof document.body.style[this.domPrefixes[i] + prop] !== 'undefined') {
                    return true;
                }
            }

            return false;
        }

        ,cssTransitions: function () {
            // Use Modernizr if available & implements csstransitions test
            if (typeof window.Modernizr !== 'undefined' && Modernizr.csstransitions !== 'undefined') {
                return Modernizr.csstransitions;
            }

            // Use testDom method to check prop (returns bool)
            return this.testDom('Transition');
        }

        ,cssTransforms3d: function () {
            // Use Modernizr if available & implements csstransforms3d test
            if (typeof window.Modernizr !== 'undefined' && Modernizr.csstransforms3d !== 'undefined') {
                return Modernizr.csstransforms3d;
            }

            // Check for vendor-less prop
            if (typeof document.body.style['perspectiveProperty'] !== 'undefined') {
                return true;
            }

            // Use testDom method to check prop (returns bool)
            return this.testDom('Perspective');
        }
    };

	// jQuery plugin wrapper
	$.fn['refineSlide'] = function (settings) {
		return this.each(function () {
            // Check if already instantiated on this elem
			if (!$.data(this, 'refineSlide')) {
                // Instantiate & store elem + string
				$.data(this, 'refineSlide', new RS(this, settings));
			}
		});
	}
})(window.jQuery, window, window.document);
