/**
 * 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: 8200,
            pause_on_hover: true,
            randomize_first_quote: true,
            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, function () {
                            if (jQuery.browser.msie)
                                $(this).get(0).style.removeAttribute('filter');
                        });
                    });

                    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);