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/*
 *  Copyright © 2004 Peter Harvey
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id$
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gtk/gtktoolitem.h>
#include <glib/gi18n.h>

#include "ephy-topic-factory-action.h"
#include "ephy-topic-action.h"
#include "ephy-bookmarks-ui.h"
#include "ephy-shell.h"
#include "ephy-stock-icons.h"
#include "egg-editable-toolbar.h"

static void ephy_topic_factory_action_class_init (EphyTopicFactoryActionClass *class);

#define EPHY_TOPIC_FACTORY_ACTION_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_TOPIC_FACTORY_ACTION, EphyTopicActionPrivate))
#define EGG_TOOLBARS_MODEL_DATA "ephy-topic-factory-menu"

static GObjectClass *parent_class = NULL;

GType
ephy_topic_factory_action_get_type (void)
{
    static GType type = 0;

    if (!type)
    {
        const GTypeInfo type_info =
        {
            sizeof (EphyTopicFactoryActionClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) ephy_topic_factory_action_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,
            sizeof (EphyTopicFactoryAction),
            0, /* n_preallocs */
            NULL
        };

        type = g_type_register_static (GTK_TYPE_ACTION,
                           "EphyTopicFactoryAction",
                           &type_info, 0);
    }
    return type;
}

static int
sort_topics (gconstpointer a, gconstpointer b)
{
    EphyNode *node_a = *(EphyNode **)a;
    EphyNode *node_b = *(EphyNode **)b;
    const char *title1, *title2;
    int priority1, priority2;
  
    priority1 = ephy_node_get_property_int (node_a, EPHY_NODE_KEYWORD_PROP_PRIORITY);
    priority2 = ephy_node_get_property_int (node_b, EPHY_NODE_KEYWORD_PROP_PRIORITY);
    
    if (priority1 > priority2)
    {
        return 1;
    }
    else if (priority1 < priority2)
    {
        return -1;
    }
    else
    {
        title1 = ephy_node_get_property_string (node_a, EPHY_NODE_KEYWORD_PROP_NAME);
        title2 = ephy_node_get_property_string (node_b, EPHY_NODE_KEYWORD_PROP_NAME);

        if (title1 == NULL)
        {
            return -1;
        }
        else if (title2 == NULL)
        {
            return 1;
        }
        else
        {
            return g_utf8_collate (title1, title2);
        }
    }
    
    return 0;
}

static void
activate_item_cb (GtkWidget *menuitem, GtkWidget *placeholder)
{
    GtkWidget *toolbar, *etoolbar, *item;
    EggToolbarsModel *model;
    GList *children;
    gint index, pos;
    char *id;

    item = gtk_widget_get_ancestor (placeholder, GTK_TYPE_TOOL_ITEM);
    g_return_if_fail (item);
    toolbar = gtk_widget_get_ancestor (item, GTK_TYPE_TOOLBAR);
    g_return_if_fail (toolbar);
    etoolbar = gtk_widget_get_ancestor (toolbar, EGG_TYPE_EDITABLE_TOOLBAR);
    g_return_if_fail (etoolbar);
    model = egg_editable_toolbar_get_model (EGG_EDITABLE_TOOLBAR (etoolbar));
    g_return_if_fail (model);
    
    children = gtk_container_get_children (GTK_CONTAINER (etoolbar));
    pos = g_list_index (children, toolbar->parent);
    index = gtk_toolbar_get_item_index (GTK_TOOLBAR (toolbar), GTK_TOOL_ITEM (item));
    g_list_free (children);
    
    id = g_object_get_data (G_OBJECT (menuitem), "ephy-action");
    egg_toolbars_model_add_item (model, pos, index, id);
}

static GtkWidget *
build_menu (GtkWidget *placeholder, EggToolbarsModel *model)
{
    GtkWidget *menu, *item;
    
    EphyBookmarks *eb;
    EphyNode *node;
    GPtrArray *children, *topics;

    const char *name;
    char action[EPHY_TOPIC_ACTION_NAME_BUFFER_SIZE];
    gint i, priority = -1, ptmp, flags;
    
    /* Get a sorted list of topics. */
    eb = ephy_shell_get_bookmarks (ephy_shell);
    node = ephy_bookmarks_get_keywords (eb);
    children = ephy_node_get_children (node);
    topics = g_ptr_array_sized_new (children->len);
    for (i = 0; i < children->len; i++)
      g_ptr_array_add (topics, g_ptr_array_index (children, i));
    g_ptr_array_sort (topics, (GCompareFunc)sort_topics);
    
    menu = gtk_menu_new ();
    for (i = 0; i < topics->len; i++)
    {
        node = g_ptr_array_index (topics, i);

        EPHY_TOPIC_ACTION_NAME_PRINTF (action, node);

        flags = egg_toolbars_model_get_name_flags (model, action);
        if (flags & EGG_TB_MODEL_NAME_USED)
          continue;
        
        ptmp = ephy_node_get_property_int (node, EPHY_NODE_KEYWORD_PROP_PRIORITY);
        if (ptmp != priority && priority >= 0)
        {
            item = gtk_separator_menu_item_new ();
            gtk_widget_show (item);
            gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
        }
        priority = ptmp;
        
        name = ephy_node_get_property_string (node, EPHY_NODE_KEYWORD_PROP_NAME);
        item = gtk_menu_item_new_with_label (name);

        /* FIXME: set the |node| instead here! */
        g_object_set_data_full (G_OBJECT (item), "ephy-action",
                    g_strdup (action), g_free);
        g_signal_connect (item, "activate", G_CALLBACK (activate_item_cb), placeholder);
        gtk_widget_show (item);
        
        gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
    }
    g_ptr_array_free (topics, TRUE);
    
    return menu;
}

static void
remove_placeholder_cb (GtkMenuShell *menushell, GtkWidget *placeholder)
{
    GtkWidget *toolbar, *etoolbar, *item;
    EggToolbarsModel *model;
    GList *children;
    gint index, pos;
    
    item = gtk_widget_get_ancestor (placeholder, GTK_TYPE_TOOL_ITEM);
    g_return_if_fail (item);
    toolbar = gtk_widget_get_ancestor (item, GTK_TYPE_TOOLBAR);
    g_return_if_fail (toolbar);
    etoolbar = gtk_widget_get_ancestor (toolbar, EGG_TYPE_EDITABLE_TOOLBAR);
    g_return_if_fail (etoolbar);
    model = egg_editable_toolbar_get_model (EGG_EDITABLE_TOOLBAR (etoolbar));
    g_return_if_fail (model);

    g_object_set_data (G_OBJECT (model), EGG_TOOLBARS_MODEL_DATA, NULL);

    children = gtk_container_get_children (GTK_CONTAINER (etoolbar));
    pos = g_list_index (children, toolbar->parent);
    index = gtk_toolbar_get_item_index (GTK_TOOLBAR (toolbar), GTK_TOOL_ITEM (item));
    g_list_free (children);
    
    egg_toolbars_model_remove_item (model, pos, index);
}

static gboolean
activate_placeholder_cb (GtkWidget *placeholder)
{
    GtkWidget *toolbar, *etoolbar, *item, *menu;
    EggToolbarsModel *model;
    gint index;
    
    /* Get our position on a toolbar. */
    item = gtk_widget_get_ancestor (placeholder, GTK_TYPE_TOOL_ITEM);
    g_return_val_if_fail (item, FALSE);
    toolbar = gtk_widget_get_ancestor (item, GTK_TYPE_TOOLBAR);
    g_return_val_if_fail (toolbar, FALSE);
    etoolbar = gtk_widget_get_ancestor (toolbar, EGG_TYPE_EDITABLE_TOOLBAR);
    g_return_val_if_fail (etoolbar, FALSE);
    model = egg_editable_toolbar_get_model (EGG_EDITABLE_TOOLBAR (etoolbar));
    g_return_val_if_fail (model, FALSE);
    
    /* If we are not yet on the toolbar, abort. */
    index = gtk_toolbar_get_item_index (GTK_TOOLBAR (toolbar), GTK_TOOL_ITEM (item));
    if (index < 0 || index >= gtk_toolbar_get_n_items (GTK_TOOLBAR (toolbar)))
      return FALSE;
    
    /* If there is already a popup menu, abort. */
    menu = g_object_get_data (G_OBJECT (model), EGG_TOOLBARS_MODEL_DATA);
    if (menu != NULL) return FALSE;
    
    /* Create the menu and store it's pointer to ensure noone else creates a menu. */
    menu = build_menu (placeholder, model);
    g_object_set_data (G_OBJECT (model), EGG_TOOLBARS_MODEL_DATA, menu);

    g_signal_connect (menu, "selection-done",
              G_CALLBACK (remove_placeholder_cb), placeholder);
        
    gtk_menu_popup (GTK_MENU (menu), NULL, NULL, NULL, NULL, 0,
            gtk_get_current_event_time ());
    
    return FALSE;
}

static void
clicked_placeholder_cb (GtkWidget *placeholder, GdkEventButton *event, gpointer user)
{
    activate_placeholder_cb (placeholder);
}

static void
realize_placeholder_cb (GtkWidget *placeholder, gpointer user)
{
    g_idle_add ((GSourceFunc) activate_placeholder_cb, placeholder);
}

static GtkWidget *
create_tool_item (GtkAction *action)
{
    GtkWidget *item = GTK_WIDGET (gtk_tool_item_new ());
    GtkWidget *widget = gtk_button_new_with_label ("  ?  ");
    gtk_button_set_relief (GTK_BUTTON (widget), GTK_RELIEF_NONE);
    
    gtk_container_add (GTK_CONTAINER (item), widget);
    gtk_widget_show (widget);
    
    return item;
}

static void
connect_proxy (GtkAction *action, GtkWidget *proxy)
{
    GtkWidget *widget;
    
    (* GTK_ACTION_CLASS (parent_class)->connect_proxy) (action, proxy);

    g_return_if_fail (GTK_IS_TOOL_ITEM (proxy));
    
    widget = gtk_bin_get_child (GTK_BIN (proxy));
    
    g_signal_connect (G_OBJECT (widget), "realize",
              G_CALLBACK (realize_placeholder_cb),
              G_OBJECT (action));
    g_signal_connect (G_OBJECT (widget), "clicked",
              G_CALLBACK (clicked_placeholder_cb),
              G_OBJECT (action));
}

static void
ephy_topic_factory_action_class_init (EphyTopicFactoryActionClass *class)
{
    GtkActionClass *action_class = GTK_ACTION_CLASS (class);

    parent_class = g_type_class_peek_parent (class);

    action_class->toolbar_item_type = GTK_TYPE_TOOL_ITEM;
    action_class->connect_proxy = connect_proxy;
    action_class->create_tool_item = create_tool_item;
}

GtkAction *
ephy_topic_factory_action_new (const char *name)
{
    return GTK_ACTION (g_object_new (EPHY_TYPE_TOPIC_FACTORY_ACTION,
                     "name", name,
                     "label", _("Quick Topic"),
                     "stock-id", GTK_STOCK_ADD,
                     NULL));
}