/*
    anythingSlider v1.2
    
    By Chris Coyier: http://css-tricks.com
    with major improvements by Doug Neiner: http://pixelgraphics.us/
    based on work by Remy Sharp: http://jqueryfordesigners.com/


	To use the navigationFormatter function, you must have a function that
	accepts two paramaters, and returns a string of HTML text.
	
	index = integer index (1 based);
	panel = jQuery wrapped LI item this tab references
	@return = Must return a string of HTML/Text
	
	navigationFormatter: function(index, panel){
		return index + " Panel"; // This would have each tab with the text 'X Panel' where X = index
	}
*/

(function($) {

  $.anythingSlider = function(el, options) {
    // To avoid scope issues, use 'base' instead of 'this'
    // to reference this class from internal events and functions.
    var base = this;

    var $forward, $back;

    // Access to jQuery and DOM versions of element
    base.$el = $(el);
    base.el = el;

    // Set up a few defaults
    base.currentPage = 1;
    base.timer = null;
    base.playing = false;

    // Add a reverse reference to the DOM object
    base.$el.data("AnythingSlider", base);

    base.init = function() {
      base.options = $.extend({}, $.anythingSlider.defaults, options);

      // Cache existing DOM elements for later 
      base.$wrapper = base.$el.find('> div').css('overflow', 'hidden');
      base.$slider = base.$wrapper.find('> ul');
      base.$items = base.$slider.find('> li');
      base.$single = base.$items.filter(':first');

      // Build the navigation if needed
      if (base.options.buildNavigation) base.buildNavigation();

      // Get the details
      base.singleWidth = base.$single.outerWidth();
      base.pages = base.$items.length;

      // Top and tail the list with 'visible' number of items, top has the last section, and tail has the first
      // This supports the "infinite" scrolling

      base.$items.filter(':first').before(base.$items.filter(':last').clone().addClass('cloned'));
      base.$items.filter(':last').after(base.$items.filter(':first').clone().addClass('cloned'));

      // We just added two items, time to re-cache the list
      base.$items = base.$slider.find('> li'); // reselect

      // Setup our forward/backward navigation
      base.buildNextBackButtons();

      // If autoPlay functionality is included, then initialize the settings
      if (base.options.autoPlay) {
        base.playing = !base.options.startStopped; // Sets the playing variable to false if startStopped is true
        base.buildAutoPlay();
      };

      // If pauseOnHover then add hover effects
      if (base.options.pauseOnHover) {
        base.$el.hover(function() {
          base.clearTimer();
        }, function() {
          base.startStop(base.playing);
        });
      }

      // If a hash can not be used to trigger the plugin, then go to page 1
      if ((base.options.hashTags == true && !base.gotoHash()) || base.options.hashTags == false) {
        $back.hide();
        base.setCurrentPage(1);
      };
    };

    base.gotoPage = function(page, autoplay) {
      // When autoplay isn't passed, we stop the timer
      if (autoplay !== true) autoplay = false;
      if (!autoplay) base.startStop(false);

      if (typeof (page) == "undefined" || page == null) {
        page = 1;
        base.setCurrentPage(1);
      };

      // Just check for bounds
      if (page > base.pages + 1) page = base.pages;
      if (page < 0) page = 1;

      if (page == 1) {
        $back.hide();
      }
      else {
        $back.show();
      }     

      // (base.pages - 3) to account for cloning
      if (page == (base.pages - 3)) {
        $forward.hide();
      }
      else {
        $forward.show();
      }


      var dir = page < base.currentPage ? -1 : 1,
                n = Math.abs(base.currentPage - page),
                left = base.singleWidth * dir * n;

      base.$wrapper.filter(':not(:animated)').animate({
        scrollLeft: '+=' + left
      }, base.options.animationTime, base.options.easing, function() {
        if (page == 0) {
          base.$wrapper.scrollLeft(base.singleWidth * base.pages);
          page = base.pages;
        } else if (page > base.pages) {
          base.$wrapper.scrollLeft(base.singleWidth);
          // reset back to start position
          page = 1;
        };
        base.setCurrentPage(page);

      });
    };

    base.setCurrentPage = function(page, move) {
      // Set visual
      if (base.options.buildNavigation) {
        base.$nav.find('.cur').removeClass('cur');
        $(base.$navLinks[page - 1]).addClass('cur');
      };

      // Only change left if move does not equal false
      if (move !== false) base.$wrapper.scrollLeft(base.singleWidth * page);

      // Update local variable
      base.currentPage = page;
    };

    base.goForward = function(autoplay) {
      if (autoplay !== true) autoplay = false;
      base.gotoPage(base.currentPage + 1, autoplay);
    };

    base.goBack = function() {
      base.gotoPage(base.currentPage - 1);
    };

    // This method tries to find a hash that matches panel-X
    // If found, it tries to find a matching item
    // If that is found as well, then that item starts visible
    base.gotoHash = function() {
      if (/^#?panel-\d+$/.test(window.location.hash)) {
        var index = parseInt(window.location.hash.substr(7));
        var $item = base.$items.filter(':eq(' + index + ')');
        if ($item.length != 0) {
          base.setCurrentPage(index);
          return true;
        };
      };
      return false; // A item wasn't found;
    };

    // Creates the numbered navigation links
    base.buildNavigation = function() {
      base.$nav = $("<div id='thumbNav'></div>").appendTo(base.$el);
      base.$items.each(function(i, el) {
        var index = i + 1;
        var $a = $("<a href='#'></a>");

        // If a formatter function is present, use it
        if (typeof (base.options.navigationFormatter) == "function") {
          $a.html(base.options.navigationFormatter(index, $(this)));
        } else {
          $a.text(index);
        }
        $a.click(function(e) {
          base.gotoPage(index);

          if (base.options.hashTags)
            base.setHash('panel-' + index);

          e.preventDefault();
        });
        base.$nav.append($a);
      });
      base.$navLinks = base.$nav.find('> a');
    };


    // Creates the Forward/Backward buttons
    base.buildNextBackButtons = function() {
      $forward = $('<a class="arrow forward">&gt;</a>'),
				$back = $('<a class="arrow back">&lt;</a>');

      // Bind to the forward and back buttons
      $back.click(function(e) {
        base.goBack();
        e.preventDefault();
      });

      $forward.click(function(e) {
        base.goForward();
        e.preventDefault();
      });

      // Append elements to page
      base.$wrapper.after($back).after($forward);
    };

    // Creates the Start/Stop button
    base.buildAutoPlay = function() {

      base.$startStop = $("<a href='#' id='start-stop'></a>").html(base.playing ? base.options.stopText : base.options.startText);
      base.$el.append(base.$startStop);
      base.$startStop.click(function(e) {
        base.startStop(!base.playing);
        e.preventDefault();
      });

      // Use the same setting, but trigger the start;
      base.startStop(base.playing);
    };

    // Handles stopping and playing the slideshow
    // Pass startStop(false) to stop and startStop(true) to play
    base.startStop = function(playing) {
      if (playing !== true) playing = false; // Default if not supplied is false

      // Update variable
      base.playing = playing;

      // Toggle playing and text
      if (base.options.autoPlay) base.$startStop.toggleClass("playing", playing).html(playing ? base.options.stopText : base.options.startText);

      if (playing) {
        base.clearTimer(); // Just in case this was triggered twice in a row
        base.timer = window.setInterval(function() {
          base.goForward(true);
        }, base.options.delay);
      } else {
        base.clearTimer();
      };
    };

    base.clearTimer = function() {
      // Clear the timer only if it is set
      if (base.timer) window.clearInterval(base.timer);
    };

    // Taken from AJAXY jquery.history Plugin
    base.setHash = function(hash) {
      // Write hash
      if (typeof window.location.hash !== 'undefined') {
        if (window.location.hash !== hash) {
          window.location.hash = hash;
        };
      } else if (location.hash !== hash) {
        location.hash = hash;
      };

      // Done
      return hash;
    };
    // <-- End AJAXY code


    // Trigger the initialization
    base.init();
  };


  $.anythingSlider.defaults = {
    easing: "swing",                // Anything other than "linear" or "swing" requires the easing plugin
    autoPlay: true,                 // This turns off the entire FUNCTIONALY, not just if it starts running or not
    startStopped: false,            // If autoPlay is on, this can force it to start stopped
    delay: 3000,                    // How long between slide transitions in AutoPlay mode
    animationTime: 600,             // How long the slide transition takes
    hashTags: true,                 // Should links change the hashtag in the URL?
    buildNavigation: true,          // If true, builds and list of anchor links to link to each slide
    pauseOnHover: true,             // If true, and autoPlay is enabled, the show will pause on hover
    startText: "Start",             // Start text
    stopText: "Stop",               // Stop text
    navigationFormatter: null       // Details at the top of the file on this use (advanced use)
  };


  $.fn.anythingSlider = function(options) {
    if (typeof (options) == "object") {
      return this.each(function(i) {
        (new $.anythingSlider(this, options));

        // This plugin supports multiple instances, but only one can support hash-tag support
        // This disables hash-tags on all items but the first one
        options.hashTags = false;
      });
    } else if (typeof (options) == "number") {

      return this.each(function(i) {
        var anySlide = $(this).data('AnythingSlider');
        if (anySlide) {
          anySlide.gotoPage(options);
        }
      });
    }
  };


})(jQuery);