/**

 * 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: 1.0.0

 */



(function($) {



  $.quote_rotator = {

    defaults: {

      rotation_speed: 10000,

      pause_on_hover: true,

      randomize_first_quote: false,

      buttons: false

    }

  }



  $.fn.extend({

    quote_rotator: function(config) {

      

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

      

      return this.each(function() {

        var rotation;

        var quote_list = $(this);

        var list_items = quote_list.find('li');

        var rotation_active = true;

        var rotation_speed = config.rotation_speed < 2000 ? 2000 : config.rotation_speed;

        

        var add_active_class = function() {

          var active_class_not_already_applied = quote_list.find('li.active').length === 0;

          if (config.randomize_first_quote) {

            var random_list_item = $(list_items[Math.floor( Math.random() * (list_items.length) )]);

            random_list_item.addClass('active');

          } else if (active_class_not_already_applied) {

              quote_list.find('li:first').addClass('active');

          }

        }();

        

        var get_next_quote = function(quote) {

          return quote.next('li').length ? quote.next('li') : quote_list.find('li:first');

        }

        

        var get_previous_quote = function(quote) {

          return quote.prev('li').length ? quote.prev('li') : quote_list.find('li:last');

        }

        

        var rotate_quotes = function(direction) {

          var active_quote = quote_list.find('li.active');

          var next_quote = direction === 'forward' ? get_next_quote(active_quote) : get_previous_quote(active_quote)

          

          active_quote.animate({

            opacity: 0

          }, 1000, function() {

            active_quote.hide();

            list_items.css('opacity', 1);

            next_quote.fadeIn(1000);

          });

          

          active_quote.removeClass('active');

          next_quote.addClass('active');

        };

        

        var start_automatic_rotation = function() {

          rotation = setInterval(function() {

            if (rotation_active) { rotate_quotes('forward'); }

          }, rotation_speed);

        };



        var pause_rotation_on_hover = function() {

          quote_list.hover(function() {

            rotation_active = false;

          }, function() {

            rotation_active = true;

          });

        };

        

        var include_next_previous_buttons = function() {

          quote_list.append(

            '<div class="qr_buttons">'+

              '<button class="qr_previous">'+ config.buttons.previous +'</button>'+

              '<button class="qr_next">'+ config.buttons.next +'</button>'+

            '</div>'

          );

          quote_list.find('button').click(function() {

            clearInterval(rotation);

            rotate_quotes( $(this).hasClass('qr_next') ? 'forward' : 'backward' );

            start_automatic_rotation();

          });

        };

        

        if (config.buttons) { include_next_previous_buttons(); }

        if (config.pause_on_hover) { pause_rotation_on_hover(); }

        

        list_items.not('.active').hide();

        

        start_automatic_rotation();

      })

    }

  })



})(jQuery);