(function ($) {

  var methods = {

    init : function(options) {
      var defaults = {
        indicators: true,
        height: 400,
        transition: 500,
        interval: 6000
      };
      options = $.extend(defaults, options);

      return this.each(function() {

        // For each slider, we want to keep track of
        // which slide is active and its associated content
        var $this = $(this);
        var $slider = $this.find('ul.slides').first();
        var $slides = $slider.find('li');
        var $active_index = $slider.find('.active').index();
        var $active, $indicators, $interval;
        if ($active_index != -1) { $active = $slides.eq($active_index); }

        // Transitions the caption depending on alignment
        function captionTransition(caption, duration) {
          if (caption.hasClass("center-align")) {
            caption.velocity({opacity: 0, translateY: -100}, {duration: duration, queue: false});
          }
          else if (caption.hasClass("right-align")) {
            caption.velocity({opacity: 0, translateX: 100}, {duration: duration, queue: false});
          }
          else if (caption.hasClass("left-align")) {
            caption.velocity({opacity: 0, translateX: -100}, {duration: duration, queue: false});
          }
        }

        // This function will transition the slide to any index of the next slide
        function moveToSlide(index) {
          // Wrap around indices.
          if (index >= $slides.length) index = 0;
          else if (index < 0) index = $slides.length -1;

          $active_index = $slider.find('.active').index();

          // Only do if index changes
          if ($active_index != index) {
            $active = $slides.eq($active_index);
            $caption = $active.find('.caption');

            $active.removeClass('active');
            $active.velocity({opacity: 0}, {duration: options.transition, queue: false, easing: 'easeOutQuad',
                              complete: function() {
                                $slides.not('.active').velocity({opacity: 0, translateX: 0, translateY: 0}, {duration: 0, queue: false});
                              } });
            captionTransition($caption, options.transition);


            // Update indicators
            if (options.indicators) {
              $indicators.eq($active_index).removeClass('active');
            }

            $slides.eq(index).velocity({opacity: 1}, {duration: options.transition, queue: false, easing: 'easeOutQuad'});
            $slides.eq(index).find('.caption').velocity({opacity: 1, translateX: 0, translateY: 0}, {duration: options.transition, delay: options.transition, queue: false, easing: 'easeOutQuad'});
            $slides.eq(index).addClass('active');


            // Update indicators
            if (options.indicators) {
              $indicators.eq(index).addClass('active');
            }
          }
        }

        // Set height of slider
        // If fullscreen, do nothing
        if (!$this.hasClass('fullscreen')) {
          if (options.indicators) {
            // Add height if indicators are present
            $this.height(options.height + 40);
          }
          else {
            $this.height(options.height);
          }
          $slider.height(options.height);
        }


        // Set initial positions of captions
        $slides.find('.caption').each(function () {
          captionTransition($(this), 0);
        });

        // Move img src into background-image
        $slides.find('img').each(function () {
          var placeholderBase64 = 'data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
          if ($(this).attr('src') !== placeholderBase64) {
            $(this).css('background-image', 'url(' + $(this).attr('src') + ')' );
            $(this).attr('src', placeholderBase64);
          }
        });

        // dynamically add indicators
        if (options.indicators) {
          $indicators = $('<ul class="indicators"></ul>');
          $slides.each(function( index ) {
            var $indicator = $('<li class="indicator-item"></li>');

            // Handle clicks on indicators
            $indicator.click(function () {
              var $parent = $slider.parent();
              var curr_index = $parent.find($(this)).index();
              moveToSlide(curr_index);

              // reset interval
              clearInterval($interval);
              $interval = setInterval(
                function(){
                  $active_index = $slider.find('.active').index();
                  if ($slides.length == $active_index + 1) $active_index = 0; // loop to start
                  else $active_index += 1;

                  moveToSlide($active_index);

                }, options.transition + options.interval
              );
            });
            $indicators.append($indicator);
          });
          $this.append($indicators);
          $indicators = $this.find('ul.indicators').find('li.indicator-item');
        }

        if ($active) {
          $active.show();
        }
        else {
          $slides.first().addClass('active').velocity({opacity: 1}, {duration: options.transition, queue: false, easing: 'easeOutQuad'});

          $active_index = 0;
          $active = $slides.eq($active_index);

          // Update indicators
          if (options.indicators) {
            $indicators.eq($active_index).addClass('active');
          }
        }

        // Adjust height to current slide
        $active.find('img').each(function() {
          $active.find('.caption').velocity({opacity: 1, translateX: 0, translateY: 0}, {duration: options.transition, queue: false, easing: 'easeOutQuad'});
        });

        // auto scroll
        $interval = setInterval(
          function(){
            $active_index = $slider.find('.active').index();
            moveToSlide($active_index + 1);

          }, options.transition + options.interval
        );


        // HammerJS, Swipe navigation

        // Touch Event
        var panning = false;
        var swipeLeft = false;
        var swipeRight = false;

        $this.hammer({
            prevent_default: false
        }).bind('pan', function(e) {
          if (e.gesture.pointerType === "touch") {

            // reset interval
            clearInterval($interval);

            var direction = e.gesture.direction;
            var x = e.gesture.deltaX;
            var velocityX = e.gesture.velocityX;

            $curr_slide = $slider.find('.active');
            $curr_slide.velocity({ translateX: x
                }, {duration: 50, queue: false, easing: 'easeOutQuad'});

            // Swipe Left
            if (direction === 4 && (x > ($this.innerWidth() / 2) || velocityX < -0.65)) {
              swipeRight = true;
            }
            // Swipe Right
            else if (direction === 2 && (x < (-1 * $this.innerWidth() / 2) || velocityX > 0.65)) {
              swipeLeft = true;
            }

            // Make Slide Behind active slide visible
            var next_slide;
            if (swipeLeft) {
              next_slide = $curr_slide.next();
              if (next_slide.length === 0) {
                next_slide = $slides.first();
              }
              next_slide.velocity({ opacity: 1
                  }, {duration: 300, queue: false, easing: 'easeOutQuad'});
            }
            if (swipeRight) {
              next_slide = $curr_slide.prev();
              if (next_slide.length === 0) {
                next_slide = $slides.last();
              }
              next_slide.velocity({ opacity: 1
                  }, {duration: 300, queue: false, easing: 'easeOutQuad'});
            }


          }

        }).bind('panend', function(e) {
          if (e.gesture.pointerType === "touch") {

            $curr_slide = $slider.find('.active');
            panning = false;
            curr_index = $slider.find('.active').index();

            if (!swipeRight && !swipeLeft) {
              // Return to original spot
              $curr_slide.velocity({ translateX: 0
                  }, {duration: 300, queue: false, easing: 'easeOutQuad'});
            }
            else if (swipeLeft) {
              moveToSlide(curr_index + 1);
              $curr_slide.velocity({translateX: -1 * $this.innerWidth() }, {duration: 300, queue: false, easing: 'easeOutQuad',
                                    complete: function() {
                                      $curr_slide.velocity({opacity: 0, translateX: 0}, {duration: 0, queue: false});
                                    } });
            }
            else if (swipeRight) {
              moveToSlide(curr_index - 1);
              $curr_slide.velocity({translateX: $this.innerWidth() }, {duration: 300, queue: false, easing: 'easeOutQuad',
                                    complete: function() {
                                      $curr_slide.velocity({opacity: 0, translateX: 0}, {duration: 0, queue: false});
                                    } });
            }
            swipeLeft = false;
            swipeRight = false;

            // Restart interval
            clearInterval($interval);
            $interval = setInterval(
              function(){
                $active_index = $slider.find('.active').index();
                if ($slides.length == $active_index + 1) $active_index = 0; // loop to start
                else $active_index += 1;

                moveToSlide($active_index);

              }, options.transition + options.interval
            );
          }
        });

        $this.on('sliderPause', function() {
          clearInterval($interval);
        });

        $this.on('sliderStart', function() {
          clearInterval($interval);
          $interval = setInterval(
            function(){
              $active_index = $slider.find('.active').index();
              if ($slides.length == $active_index + 1) $active_index = 0; // loop to start
              else $active_index += 1;

              moveToSlide($active_index);

            }, options.transition + options.interval
          );
        });

        $this.on('sliderNext', function() {
          $active_index = $slider.find('.active').index();
          moveToSlide($active_index + 1);
        });

        $this.on('sliderPrev', function() {
          $active_index = $slider.find('.active').index();
          moveToSlide($active_index - 1);
        });

      });



    },
    pause : function() {
      $(this).trigger('sliderPause');
    },
    start : function() {
      $(this).trigger('sliderStart');
    },
    next : function() {
      $(this).trigger('sliderNext');
    },
    prev : function() {
      $(this).trigger('sliderPrev');
    }
  };


    $.fn.slider = function(methodOrOptions) {
      if ( methods[methodOrOptions] ) {
        return methods[ methodOrOptions ].apply( this, Array.prototype.slice.call( arguments, 1 ));
      } else if ( typeof methodOrOptions === 'object' || ! methodOrOptions ) {
        // Default to "init"
        return methods.init.apply( this, arguments );
      } else {
        $.error( 'Method ' +  methodOrOptions + ' does not exist on jQuery.tooltip' );
      }
    }; // Plugin end
}( jQuery ));