/**
 * History/Remote - jQuery plugin for enabling history support and bookmarking
 * @requires jQuery v1.0.3
 *
 * http://stilbuero.de/jquery/history/
 *
 * Copyright (c) 2006 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Version: 0.2.3
 */
(function ($) {
    $.ajaxHistory = new
    function () {
        var RESET_EVENT = 'historyReset';
        var _currentHash = location.hash;
        var _intervalId = null;
        var _observeHistory;
        this.update = function () {};
        var _defaultReset = function () {
            $('.remote-output').empty();
        };
        $(document).bind(RESET_EVENT, _defaultReset);
        if ($.browser.msie) {
            var _historyIframe, initialized = false;
            $(function () {
                _historyIframe = $('<iframe style="display: none;"></iframe>').appendTo(document.body).get(0);
                var iframe = _historyIframe.contentWindow.document;
                iframe.open();
                iframe.close();
                if (_currentHash && _currentHash != '#') {
                    iframe.location.hash = _currentHash.replace('#', '');
                }
            });
            this.update = function (hash) {
                _currentHash = hash;
                var iframe = _historyIframe.contentWindow.document;
                iframe.open();
                iframe.close();
                iframe.location.hash = hash.replace('#', '');
            };
            _observeHistory = function () {
                var iframe = _historyIframe.contentWindow.document;
                var iframeHash = iframe.location.hash;
                if (iframeHash != _currentHash) {
                    _currentHash = iframeHash;
                    if (iframeHash && iframeHash != '#') {
                        $('a[href$=' + iframeHash + ']').click();
                        location.hash = iframeHash;
                    } else if (initialized) {
                        location.hash = '';
                        $(document).trigger(RESET_EVENT);
                    }
                }
                initialized = true;
            };
        } else if ($.browser.mozilla || $.browser.opera) {
            this.update = function (hash) {
                _currentHash = hash;
            };
            _observeHistory = function () {
                if (location.hash) {
                    if (_currentHash != location.hash) {
                        _currentHash = location.hash;
                        $('a[href$=' + _currentHash + ']').click();
                    }
                } else if (_currentHash) {
                    _currentHash = '';
                    $(document).trigger(RESET_EVENT);
                }
            };
        } else if ($.browser.safari) {
            var _backStack, _forwardStack, _addHistory;
            $(function () {
                _backStack = [];
                _backStack.length = history.length;
                _forwardStack = [];
            });
            var isFirst = false,
                initialized = false;
            _addHistory = function (hash) {
                _backStack.push(hash);
                _forwardStack.length = 0;
                isFirst = false;
            };
            this.update = function (hash) {
                _currentHash = hash;
                _addHistory(_currentHash);
            };
            _observeHistory = function () {
                var historyDelta = history.length - _backStack.length;
                if (historyDelta) {
                    isFirst = false;
                    if (historyDelta < 0) {
                        for (var i = 0; i < Math.abs(historyDelta); i++) _forwardStack.unshift(_backStack.pop());
                    } else {
                        for (var i = 0; i < historyDelta; i++) _backStack.push(_forwardStack.shift());
                    }
                    var cachedHash = _backStack[_backStack.length - 1];
                    $('a[href$=' + cachedHash + ']').click();
                    _currentHash = location.hash;
                } else if (_backStack[_backStack.length - 1] == undefined && !isFirst) {
                    if (document.URL.indexOf('#') >= 0) {
                        $('a[href$=' + '#' + document.URL.split('#')[1] + ']').click();
                    } else if (initialized) {
                        $(document).trigger(RESET_EVENT);
                    }
                    isFirst = true;
                }
                initialized = true;
            };
        }
        this.initialize = function (callback) {
            if (typeof callback == 'function') {
                $(document).unbind(RESET_EVENT, _defaultReset).bind(RESET_EVENT, callback);
            }
            if (location.hash && typeof _addHistory == 'undefined') {
                $('a[href$=' + location.hash + ']').trigger('click');
            }
            if (_observeHistory && _intervalId == null) {
                _intervalId = setInterval(_observeHistory, 200);
            }
        };
    };
    $.fn.remote = function (output, settings, callback) {
        callback = callback ||
        function () {};
        if (typeof settings == 'function') {
            callback = settings;
        }
        settings = $.extend({
            hashPrefix: 'remote-'
        }, settings || {});
        var target = $(output).size() && $(output) || $('<div></div>').appendTo('body');
        target.addClass('remote-output');
        return this.each(function (i) {
            var href = this.href,
                hash = '#' + (this.title && this.title.replace(/\s/g, '_') || settings.hashPrefix + (i + 1)),
                a = this;
            this.href = hash;
            $(this).click(function (e) {
                if (!target['locked']) {
                    if (e.clientX) {
                        $.ajaxHistory.update(hash);
                    }
                    target.load(href, function () {
                        target['locked'] = null;
                        callback.apply(a);
                    });
                }
            });
        });
    };
    $.fn.history = function (callback) {
        return this.click(function (e) {
            if (e.clientX) {
                if (this.hash == location.hash) {
                    return false;
                }
                $.ajaxHistory.update(this.hash);
            }
            if (typeof callback == 'function') {
                callback.call(this);
            }
        });
    };
})(jQuery);