/*
*  Enhanced Easy Slider
*
*  Built off of the Easy Slider - jQuery plugin
*  written by Alen Grakalic
*  http://cssglobe.com/post/3783/jquery-plugin-easy-image-or-content-slider
*
*  enhancements by Joseph Pecoraro
*  email: joepeck02@gmail.com
*  http://blog.bogojoker.com
*
*  The Easy Slider Copyrights:
*  Copyright (c) 2009 Alen Grakalic (http://cssglobe.com)
*  Dual licensed under the MIT (MIT-LICENSE.txt)
*  and GPL (GPL-LICENSE.txt) licenses.
*
*  Built for jQuery library
*  http://jquery.com
*
*/

/*
*  Quick Documentation of New Features
*
*    * Non-Autogenerated Pagination - set the autogeneratePagination
*      option to false in the easySlide options and be sure to provide
*      id's in the prevId and nextId options.  Those provided ids will
*      unobtrusively get the easySlide actions applied to them.
*
*    * Looping - just set the loop option to true in the easySlide
*      options and you will be able to navigate forward/backward around
*      the ends smoothly.
*
*    * Autoplay - just set the autoplayDuration to a non-zero value
*      in the easySlide options and the content will slide on its own.
*      The value you provide will only be the value between animations,
*      so you don't have to compensate for the speed of transitions,
*      that is handled automatically.  Autoplaying works fine with
*      looping.
*
*      If you have pagination buttons, when the user clicks a button
*      the autoplay will suspend for a little while.  The restartDuration
*      value specifies the amount of time since the last user
*      interruption to wait before restarting the autoplay.
*
*    * Hovering - just set hover to true and pagination will trigger
*      when hovering instead of clicking.  The slides will continue to
*      transition as long as you hover over the pagination element.
*      Hovering works fine with looping.
*
*      If you want a pause between slides you can set the hoverPause
*      value to an integer greater than 0.  That specifies the time
*      to wait between transitions.
*
*    * Linear or Swing easing - jQuery offers two different styles
*      of animations.  Just set the easing option to 'linear' or
*      'swing' (default)and it will use that easing style.
*
*    * Pauseable - Pause autoplay by hovering over an image.  Likewise
*      you can extend this to pause when hovering the buttons as well.
*
*    * Fade Orientation - Not Vertical or Horizontal Slideing, but Fading!
*      Just provide orientation: 'fade' for fading to happen.
*
*    * Callbacks - You are allowed to provide your own functions for
*      events triggered by the slider.  You can provide a function
*      for 'beforeTransition' and 'afterTransition'.  Their signature
*      is as follows:
*
*          function callback( slideNumber, jQuery_li, jQuery_ul )
*                                 ^            ^         ^
*                                 |            |         |
*     int of the slide number -----            |         |
*     jQuery wrapper for the now showing <li> --         |
*     jQuery wrapper for the entire <ul> of all slides ---
*
*       For example, to get the explicit DOM <li> Node you could do
*
*          function after(num, $li, $ul) {
*            dom_li = $li[0];
*            console.log(dom_li);
*          }
*
*/

(function($) {

    $.fn.easySlider = function(options) {

        // default configuration properties
        var defaults = {
            prevId: 'prevBtn',             // id of the element to apply prev rules to
            nextId: 'nextBtn',             // id of the element to apply next rules to
            prevText: 'Previous',          // text for autogenerated prev link
            nextText: 'Next',              // text for autogenerated next link
            autogeneratePagination: false, // will automatically generate pagination links
            orientation: '',               // 'vertical', 'fade', or anything else will assume horizontal
            speed: 4000,                    // duration of a transition
            autoplayDuration: 0,           // auto-play if non-zero, this is the time between transitions
            restartDuration: 2500,         // time to restart autoplay after a user interupts and autoplay
            loop: false,                   // loop around the content
            hoverPause: 0,                 // when hovering, the time between transitions
            hover: false,                  // on hover instead of onclick
            easing: null,                  // jQuery animation settings 'linear' or 'swing' (default)
            pauseable: false,              // pause autoplay when hovering the image
            pauseButtons: false,           // hovering over the cuttons will pause as well
            beforeTransition: null,        // callback before transitioning
            afterTransition: null          // callback after transitioning
        };

        var options = $.extend(defaults, options);

        return this.each(function() {

            // Setup Measurements and Options
            var obj = $(this),
          totalSlides = $("li", obj).length,
          slideWidth = obj.width(),
          slideHeight = obj.height(),
          lastSlide = totalSlides - 1,
          current = 0;

            // States
            var vertical = (options.orientation == 'vertical'),
          fade = (options.orientation == 'fade'),
          horizontal = (!vertical && !fade),
          autogen = options.autogeneratePagination,
          pauseable = options.pauseable,
          loop = options.loop,
          speed = options.speed,
          easing = options.easing,
          hover = options.hover,
          hoverPause = options.hoverPause,
          buttonsPause = options.pauseButtons,
          restartDuration = options.restartDuration,
          autoplayDuration = Math.max(options.autoplayDuration, 25) + speed,
          autoplay = (options.autoplayDuration > 0),
          beforeTransition = options.beforeTransition,
          afterTransition = options.afterTransition;
            interval = null,
          restart = null;

            // Autogenerate Pagination
            if (autogen) {
                $(obj).after('<span id="' + options.prevId + '"><a href=\"javascript:void(0);\">' + options.prevText + '</a></span> ' +
                      '<span id="' + options.nextId + '"><a href=\"javascript:void(0);\">' + options.nextText + '</a></span>');
            }

            // Important Elements
            var $ul = $("ul", obj),
          $next = $("#" + options.nextId),
          $prev = $("#" + options.prevId);

            // Loop - Duplicate the First Slide onto the end
            if (loop) {
                $ul.append($("li:first", obj).clone());
                totalSlides += 1;
                lastSlide += 1;
            }

            // Horizontal - Make them float left and set the width of the ul (for all slides)
            if (horizontal) {
                $("li", obj).css('float', 'left');
                $ul.css('width', totalSlides * slideWidth);
            }

            // Fade - Hide all but the first slide so they can fadeIn from nothing
            if (fade) {
                $ul.find("li:not(:first)").hide();
            }

            // Reusable Closure to pause the autoplay timer
            var pauseFunc = function() {
                clearInterval(interval);
                clearTimeout(restart);
            }

            // Reusable Closure to restart the autoplay timers using the restartDuration
            var restartFunc = function() {
                restart = setTimeout(function() {
                    interval = setInterval(auto, autoplayDuration);
                }, restartDuration);
            };

            // Pauseable (should be autoplay only, but would have no effect otherwise)
            // On Hover: cancel the autoplay timers
            // On Leave: restart the autoplay timers
            if (pauseable && autoplay) {
                $(obj).hover(pauseFunc, restartFunc);
                if (buttonsPause) {
                    $next.hover(pauseFunc, restartFunc);
                    $prev.hover(pauseFunc, restartFunc);
                }
            }

            // Add Actions to Next and Prev Buttons
            // If Not Hover Mode made it click(), if it is Hover Mode, make it hover()
            // When in autoplay mode make next/prev reset the autoplay timers
            if (!hover) {

                $next.click(function() {
                    if (autoplay) {
                        pauseFunc();
                        if (!buttonsPause) {
                            restartFunc();
                        }
                    };
                    animate("next");
                });

                $prev.click(function() {
                    if (autoplay) {
                        pauseFunc();
                        if (!buttonsPause) {
                            restartFunc();
                        }
                    };
                    animate("prev");
                });

            } else {

                var hoverNext = false,
            hoverPrev = false,
            isAnimating = false;

                $next.hover(
          function() {
              var tfunc = arguments.callee;
              hoverNext = true;
              if (!isAnimating) {
                  isAnimating = true;
                  animate("next", function() {
                      isAnimating = false;
                      if (hoverNext) { tfunc(); }
                  });
              }
          },
          function() {
              hoverNext = false;
          }
        );

                $prev.hover(
          function() {
              var tfunc = arguments.callee;
              hoverPrev = true;
              if (!isAnimating) {
                  isAnimating = true;
                  animate("prev", function() {
                      isAnimating = false;
                      if (hoverPrev) { tfunc(); }
                  });
              }
          },
          function() {
              hoverPrev = false;
          }
        );

            }


            //
            // Enclosed Slide Animation
            //
            // This handles all of the sliding/faiding animation
            // @param dir the direction "next" or "prev"
            // @param cb the callback function
            //
            function animate(dir, cb) {

                // Before Transition, Guarantee
                if (beforeTransition) {
                    beforeTransition(current, $ul.find('li:eq(' + current + ')'), $ul);
                }


                // After Transition, Guarantee
                // Setup the next have
                // NOTE: That current will be the new value when this is called
                // due to it being a closure!
                var newcb = function() {
                    if (cb != null) {
                        (hoverPause == 0) ? cb() : setTimeout(cb, hoverPause);
                    }
                    if (afterTransition) {
                        afterTransition(current, $ul.find('li:eq(' + current + ')'), $ul);
                    }
                }


                // cur, nex, and update "current"
                // cur is the old current slide, the slide we are currently on
                // nex is the new current slide, the slide we are transitioning too
                // current is a global value that gets updated right here
                var cur = current;
                if (loop) {
                    if (dir == 'next') {
                        current = (current == lastSlide) ? 1 : current + 1;
                    } else {
                        current = (current == 0) ? lastSlide - 1 : current - 1;
                    }
                } else {
                    if (dir == "next") {
                        current = (current >= lastSlide) ? lastSlide : current + 1;
                    } else {
                        current = (current <= 0) ? 0 : current - 1;
                    }
                }
                var nex = current;


                // Special Case for looping
                // If at the end and going forward, instantaneous jump to the first slide
                // If at the start and going backward, instantaneous jump to the last slide
                // NOTE: The instantaneous jump is an animate() so jQuery handles it in tune
                // with the rest of the animations, and is -1 (not 0) time so its instant.
                if (loop) {
                    if ((dir == "next") && (cur == lastSlide)) {
                        (vertical) ?
              $ul.animate({ marginTop: 0 }, -1) :
              $ul.animate({ marginLeft: 0 }, -1);
                    } else if ((dir == "prev") && (cur == 0)) {
                        (vertical) ?
              $ul.animate({ marginTop: (totalSlides - 1) * slideHeight * -1 }, -1) :
              $ul.animate({ marginLeft: (totalSlides - 1) * slideWidth * -1 }, -1);
                    }
                }


                // Dispatch jQuery Animation for the transition
                // Slide horizontally, vertically, or fade
                if (horizontal) {
                    $ul.animate({ marginLeft: (nex * slideWidth * -1) }, speed, easing, newcb);
                } else if (vertical) {
                    $ul.animate({ marginTop: (nex * slideHeight * -1) }, speed, easing, newcb);
                } else {
                    var curli = 'li:eq(' + cur + ')';
                    var nexli = 'li:eq(' + nex + ')';
                    $ul.find(curli).fadeOut("slow", function() {
                        $ul.find(nexli).fadeIn("slow", newcb);
                    });
                }


                // Correctly show the Next/Prev links
                // When looping they always show, so we can ignore that
                // If at the end, hide the next link
                // If at the start, hide the previous link
                // Any other case we can show both links
                if (!loop) {
                    if (nex <= 0) {
                        $prev.fadeOut();
                    } else if (nex >= lastSlide) {
                        $next.fadeOut();
                    } else {
                        $next.fadeIn();
                        $prev.fadeIn();
                    }
                }

            };


            //
            // Autoplay
            //
            // Note that autoplayDuration already has the transitionDuration
            // added to it (to prevent doing the addition over and over).
            // However that means that the first invokation would take
            // autoplayDuration+transitionDuration.  We remove that extra
            // wait by first doing a single setTimeout with the correct
            // time, followed by the correct setInterval.
            //
            if (autoplay) {
                var auto = function() {
                    animate('next');
                    if (!loop && current >= lastSlide) {
                        clearInterval(interval);
                    }
                }
                restart = setTimeout(function() {
                    auto();
                    interval = setInterval(auto, autoplayDuration);
                }, autoplayDuration - speed);
            }


            // Initially Hide both buttons
            $next.hide();
            $prev.hide();

            // Finally, Display the Next Link if more then one slide
            if (totalSlides > 1) {
                $next.fadeIn();
                if (loop) { $prev.fadeIn(); }
            }

        });

    };

})(jQuery);