/**
 * Quote Rotator - Simple jQuery plugin which cause a set of list
 * items to fade-in and fade-out. 
 * 
 * Homepage: http://coryschires.com/jquery-quote-rotator-plugin/
 * Source Code: https://github.com/coryschires/quote-rotator
 * 
 * Copyright (c) 2011 Cory Schires (coryschires.com)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Version: 0.1.0
 */

(function($) {

  $.quote_rotator = {
    defaults: {
      rotation_speed: 8000,
      fade_speed: 1000,
      pause_on_hover: true,
      randomize_first_quote: false
    }
  }

  $.fn.extend({
    quote_rotator: function(config) {

      var config = $.extend({}, $.quote_rotator.defaults, config);

      return this.each(function() {
                
        // cache for selector performance
        var quote_list = $(this);
        var list_items = quote_list.find('li');
                
        // prevent dummies from setting the rotation speed too fast
        var rotation_speed = config.rotation_speed < 2000 ? 2000 : config.rotation_speed;

        // hide all the quotes
        list_items.hide();

        // apply active to random quote if specified
        if (config.randomize_first_quote) {
          var random = Math.floor( Math.random() * (list_items.length) );
          $(list_items[random]).addClass('active');

        // otherwise apply active to first quote unless already applied in the html
        } else if (! (quote_list.find('li.active')).length ) {
          $('li:first', quote_list).addClass('active');
        };
                
        // show the active quote
        quote_list.find('li.active').show();
                
        // activate quote rotation
        var rotation_active = true;

        // stop quote rotation on hover
        quote_list.hover(function() {
          if (config.pause_on_hover) {
            rotation_active = false
          };
        }, function() {
          rotation_active = true
        });
                
        // rotate quotes
        setInterval(function(){
          if (rotation_active) {
                        
            var active_quote = quote_list.find('li.active');
            var next_quote =  active_quote.next().length ? active_quote.next() : quote_list.find('li:first');

            if (config.fade_speed == 0) {
              // rotate quotes with fade effect
              active_quote.hide(); // hide
              next_quote.show(); // show next quote
            } else {
              // rotate quotes with fade effect
              active_quote.animate({
                opacity: 0 // fade out active quote
              }, config.fade_speed, function() {
                active_quote.hide().css('opacity', 1); // hide and reset opacity
                next_quote.fadeIn(config.fade_speed); // fade in next quote
              });
            }
                        
            // swap the class to prepare for the next fade effect interal
            active_quote.removeClass('active');
            next_quote.addClass('active');
          };
                    
        }, rotation_speed);
                
      })
    }
  })

})(jQuery);