/*
 * jQuery Blueberry Slider v0.4 BETA
 * http://marktyrrell.com/labs/blueberry/
 *
 * Copyright (C) 2011, Mark Tyrrell <me@marktyrrell.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

(function($) {
    $.fn.extend({
        blueberry: function(options) {

            //default values for plugin options
            var defaults = {
                interval: 0,
                duration: 500,
                lineheight: 1,
                height: 'auto', //reserved
                hoverpause: false,
                pager: true,
                nav: true, //reserved
                keynav: true
            }
            var options = $.extend(defaults, options);

            return this.each(function() {
                var o = options;
                var obj = $(this);

                //store the slide and pager li
                var slides = $('.slides li', obj);
                var pager = $('.pager li', obj);

                //set initial current and next slide index values
                var current = 0;
                var next = current + 1;

                //get height and width of initial slide image and calculate size ratio
                var imgHeight = slides.eq(current).find('img').height();
                var imgWidth = slides.eq(current).find('img').width();
                var imgRatio = imgWidth / imgHeight;

                //define vars for setsize function
                var sliderWidth = 0;
                var cropHeight = 0;

                //hide all slides, fade in the first, add active class to first slide
                slides.hide().eq(current).fadeIn(o.duration).addClass('active');


                //build pager if it doesn't already exist and if enabled
                if (pager.length) {
                    pager.eq(current).addClass('active');
                } else if (o.pager) {
                    obj.append('<ul class="pager"></ul>');
                    slides.each(function(index) {
                        $('.pager', obj).append('<li><a href="#"><span>' + index + '</span></a></li>')
                    });
                    pager = $('.pager li', obj);
                    pager.eq(current).addClass('active');
                }

                //rotate to selected slide on pager click
                if (pager) {
                    $('a', pager).click(function() {
                        //stop the timer
                        clearTimeout(obj.play);
                        //set the slide index based on pager index
                        next = $(this).parent().index();
                        //rotate the slides
                        rotate();
                        return false;
                    });
                }

                //primary function to change slides
                var rotate = function() {
                    //fade out current slide and remove active class,
                    //fade in next slide and add active class
                    slides.eq(current).fadeOut(o.duration).removeClass('active')
                            .end().eq(next).fadeIn(o.duration).addClass('active').queue(function() {
                        //add rotateTimer function to end of animation queue
                        //this prevents animation buildup caused by requestAnimationFrame
                        //rotateTimer starts a timer for the next rotate
                        rotateTimer();
                        $(this).dequeue()
                    });

                    //update pager to reflect slide change
                    if (pager) {
                        pager.eq(current).removeClass('active')
                                .end().eq(next).addClass('active');
                    }

                    //update current and next vars to reflect slide change
                    //set next as first slide if current is the last
                    current = next;
                    next = current >= slides.length - 1 ? 0 : current + 1;
                };
                //create a timer to control slide rotation interval
                var rotateTimer = function() {
                    if (o.interval > 0) {
                        obj.play = setTimeout(function() {
                            //trigger slide rotate function at end of timer
                            rotate();
                        }, o.interval);
                    }
                };
                //start the timer for the first time
                rotateTimer();

                //pause the slider on hover
                //disabled by default due to bug
                if (o.hoverpause) {
                    slides.hover(function() {
                        //stop the timer in mousein
                        if (obj.play !== undefined) {
                            clearTimeout(obj.play);
                        }
                    }, function() {
                        //start the timer on mouseout
                        rotateTimer();
                    });
                }

                //calculate and set height based on image width/height ratio and specified line height
                var setsize = function() {
                    sliderWidth = $('.slides', obj).width();
                    cropHeight = Math.floor(((sliderWidth / imgRatio) / o.lineheight)) * o.lineheight;

                    //$('.slides', obj).css({height: cropHeight});
                };
                setsize();

                //bind setsize function to window resize event
                $(window).resize(function() {
                    setsize();
                });



                //Add keyboard navigation

                if (o.keynav) {
                    $(document).keyup(function(e) {

                        switch (e.which) {

                            case 39:
                            case 32: //right arrow & space
                                if (obj.play !== undefined) {
                                clearTimeout(obj.play);
                                }
                                rotate();

                                break;


                            case 37: // left arrow
                                if (obj.play !== undefined) {
                                clearTimeout(obj.play);
                                }
                                next = current - 1;
                                rotate();

                                break;
                        }

                    });
                }


            });
        }
    });
})(jQuery);
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