function Site()
{
    this.active_dialog = null;

    this.live_post = null;

    this.$current_post = null;

    return this;
}

var $Site = new Site();

/*
 * Content management
 */

Site.prototype.$boot = function() {
    var hash = window.location.hash;
    if ((new RegExp(/^#!/)).test(hash))
    {
        window.location = hash.replace(/^#!/, "");
    }
    else
    {
        page.init_content();
    }
}

Site.prototype.$menu_set_current = function(id) {
    // set active menu element
    if (id)
    {
        $("#menu > ul > li > .current").removeClass("current");
        $(id).addClass("current");
    }
}

Site.prototype.$reload_content = function() {
    location.reload();
}

Site.prototype.$trigger_menu = function(url, id) {
    if (!history.replaceState)
    {
        // don't reload the same page
        if (url == window.location.hash)
        {
            return;
        }
        window.location.hash = "#!" + url;
    }

    this.$menu_set_current(id);
    page.menu_triggered(url);
}

Site.prototype.$update_history = Site.prototype.$trigger_menu;

Site.prototype.$history_event = function(url, state) {
    // if state is null we we have not set the history entry,
    // thus it's a new entry meaning no page loading
    if (state == null)
    {
        return;
    }
    
    // If this is the initial history event, we don't want to reload
    // the page.
    if (state.init)
    {
        state.init = false;
        history.replaceState(state, state.title, state.url);
    }
    else
    {
        page.history_load(state.path);
    }
}

Site.prototype.$history_push_initial = function(title, path, dir) {
    if (history.replaceState)
    {
        url = dir + path;
        history.replaceState({ path: path, url: url, init: true, title: title },
                             title, url);
    }
}

Site.prototype.$history_push = function(title, path, dir) {
    if (history.replaceState)
    {
        url = dir + path;
        history.pushState({ path: path, url: url }, title, url);
    }
    else
    {
        window.location.hash = "#!" + path;
    }
}

Site.prototype.$set_title = function(title) {
    document.title = title;
}

/*
 * Forms
 */

Site.prototype.$disable_forms = function(id) {
    $(id + " :input").attr("disabled", "disabled");
}

Site.prototype.$enable_forms = function(id) {
    $(id + " :input").removeAttr("disabled");
};

/*
 * State panel
 */

(function($) {
     $.fn.statePanelSet = function(key, options) {
        var self = jQuery(this);
        var defaults = {
            animate: true
        }
        var options = $.extend(defaults, options);

        var animate = options.animate;
        var callback = options.callback;
        var validate_group = options.validate_group;

        // retrieve current active view
        var active = self.find(".state_panel_active");

        if (!key)
        {
            active.removeClass("state_panel_active");

            if (animate)
            {
                active.slideToggle('fast', callback);
            }
            else
            {
                active.hide();
                if (callback)
                {
                    callback();
                }
            }
            return;
        }

        if ((validate_group &&
             Nitrogen.$validate_and_serialize(validate_group) == null) ||
            !key)
        {
            return;
        }

        // retrieve next panel view
        var next = self.find(key);

        // update active state
        active.removeClass("state_panel_active");
        next.addClass("state_panel_active");

        if (animate)
        {
            // animate transition
            if (active.length > 0)
            {
                active.slideToggle('fast', function() {
                        next.slideToggle('fast', callback);
                    });
            }
            else
            {
                next.slideToggle('fast', callback);
            }
        }
        else
        {
            active.hide();
            next.show();
            if (callback)
            {
                callback();
            }
        }
    };

    $.fn.statePanelShow = function(key, options) {
        var self = jQuery(this);

        var defaults = {
            animate: true
        }
        var options = $.extend(defaults, options);

        var animate = options.animate;
        var callback = options.callback;

        // retrieve the to be panel state
        var panel = self;

        if (panel.is(':visible'))
        {
            return;
        }

        var prev = self.find(".state_panel_active")
        var active = self.find(key);

        // update active state
        active.addClass("state_panel_active");

        if (animate)
        {
            // animate transition
            panel.fadeIn('fast', function() { active.slideDown('fast', callback); });
        }
    };

    $.fn.statePanelHide = function(options) {
        var self = jQuery(this);
        var defaults = {
            animate: true,
            hide_panel: true
        }
        var options = $.extend(defaults, options);

        var animate = options.animate;
        var hide_panel = options.hide_panel;
        var callback = options.callback;
        var state_panel = options.state_panel;

        // retrieve current and next panel state
        var panel = self;
        var active = self.find(".state_panel_active");

        // update active state
        active.removeClass("state_panel_active");

        if (animate)
        {
            // animate transition
            active.slideUp('fast', hide_panel ?
                function() {
                    panel.fadeOut('fast', callback);
                } : null);
        }
        else
        {
            active.hide();
            if (hide_panel)
            {
                panel.hide();
            }
        }
    };
})(jQuery);

/*
 * Expandable
 */

Site.prototype.$expandable_toggle = function(id, link_id, key) {
    var activeClass = "expandable_active";
    var isActive = objs(link_id, id).hasClass(activeClass);

    // Deactivate all other links
    objs(".expandable_link", id).removeClass(activeClass);

    // If previously inactive, activate
    if (!isActive)
    {
        var newActive = objs(link_id, id);
        newActive.addClass(activeClass);
        objs(".wfid_exp_body", id).statePanelSet(key);
    }
    else
    {
        objs(".wfid_exp_body", id).statePanelSet();
    }
}

/*
 * Forms
 */

Site.prototype.$clear_form_fields = function(ids) {
    for (var id in ids)
    {
        $("#" + id).val("");
    }
}

/*
 * Atom icon
 */

Site.prototype.$clear_atom_feed_icon = function(path) {
    $(path).remove();
}

Site.prototype.$set_atom_feed_icon = function(path, element) {
    var link = $(path);
    if (link.length == 0)
    {
        $('#menu_bar_right').append(element);
    }
    else
    {
        link.replaceWith(element);
    }
}

/*
 * Overlay
 */

Site.prototype.$dialog_hide = function(dialog_id, callback) {
    var dialog = null;
    if (dialog_id)
    {
        dialog = $(dialog_id);
    }
    else
    {
        dialog = this.active_dialog;
        this.active_dialog = null;
    }

    if (dialog && dialog.length == 0)
    {
        $Site.$overlay_hide(callback);
    }
    else if (dialog)
    {
        dialog.fadeOut('fast', function () {
                dialog.remove();
                $Site.$overlay_hide(callback);
                });
    }
    else if (callback)
    {
        callback();
    }
}

Site.prototype.$dialog_show = function(dialog_id, callback) {
    var dialog = $(dialog_id);
    if (this.active_dialog)
    {
        this.active_dialog = null;
        dialog.fadeIn('fast', function() { $Site.$dialog_show(dialog_id, callback); });
    }
    else
    {
        this.active_dialog = dialog;
        this.$overlay_show(function() { dialog.fadeIn('fast', function() { dialog.trigger('foo'); if (callback) callback(); }); });
    }
}

Site.prototype.$overlay_hide = function(callback) {
    if (this.active_dialog)
    {
        this.$dialog_hide(null, callback);
    }
    else
    {
        this.overlay.fadeOut('fast', callback);
    }
}

Site.prototype.$overlay_inhibit_hide = function() {
    this.overlay.unbind('click');
}

Site.prototype.$set_overlay_size = function() {
    this.overlay.height($(document).height());
    this.overlay.width($(document).width());
}

Site.prototype.$overlay_show = function(callback) {
    this.$set_overlay_size();
    this.overlay.fadeIn('fast', callback);
}

/*
 * Posts
 */

Site.prototype.$new_post = function() {
    this.$current_post = new Post();
}

/*
 * Init
 */

Site.prototype.$on_document_loaded = function() {
    // initialize overlay
    this.overlay = $('#overlay');
    this.overlay.click(function() { $Site.$overlay_hide(); });
}

/*
 * History management
 */

onpopstate = function(event) {
    $Site.$history_event(window.location.hash, event.state);
}

/*
 * Init
 */

$(document).ready(function() { $Site.$on_document_loaded(); });

// overlay resizing
$(window).resize(function() { $Site.$set_overlay_size(); });