/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
 *
 * 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 of the License, 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.
 *
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#include <glib.h>
#include <glib/gi18n.h>
#include <glib-object.h>

#include "gdm-display-store.h"
#include "gdm-display.h"

#define GDM_DISPLAY_STORE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_DISPLAY_STORE, GdmDisplayStorePrivate))

struct GdmDisplayStorePrivate
{
        GHashTable *displays;
};

enum {
        DISPLAY_ADDED,
        DISPLAY_REMOVED,
        LAST_SIGNAL
};

static guint signals [LAST_SIGNAL] = { 0, };

static void     gdm_display_store_class_init    (GdmDisplayStoreClass *klass);
static void     gdm_display_store_init          (GdmDisplayStore      *display_store);
static void     gdm_display_store_finalize      (GObject              *object);

G_DEFINE_TYPE (GdmDisplayStore, gdm_display_store, G_TYPE_OBJECT)

GQuark
gdm_display_store_error_quark (void)
{
        static GQuark ret = 0;
        if (ret == 0) {
                ret = g_quark_from_static_string ("gdm_display_store_error");
        }

        return ret;
}

void
gdm_display_store_clear (GdmDisplayStore    *store)
{
        g_return_if_fail (store != NULL);
        g_debug ("GdmDisplayStore: Clearing display store");
        g_hash_table_remove_all (store->priv->displays);
}

static gboolean
remove_display (char              *id,
                GdmDisplay        *display,
                GdmDisplay        *display_to_remove)
{
        if (display == display_to_remove) {
                return TRUE;
        }
        return FALSE;
}

gboolean
gdm_display_store_remove (GdmDisplayStore    *store,
                          GdmDisplay         *display)
{
        g_return_val_if_fail (store != NULL, FALSE);

        gdm_display_store_foreach_remove (store,
                                          (GdmDisplayStoreFunc)remove_display,
                                          display);
        return FALSE;
}

void
gdm_display_store_foreach (GdmDisplayStore    *store,
                           GdmDisplayStoreFunc func,
                           gpointer            user_data)
{
        g_return_if_fail (store != NULL);
        g_return_if_fail (func != NULL);

        g_hash_table_find (store->priv->displays,
                           (GHRFunc)func,
                           user_data);
}

GdmDisplay *
gdm_display_store_find (GdmDisplayStore    *store,
                        GdmDisplayStoreFunc predicate,
                        gpointer            user_data)
{
        GdmDisplay *display;

        g_return_val_if_fail (store != NULL, NULL);
        g_return_val_if_fail (predicate != NULL, NULL);

        display = g_hash_table_find (store->priv->displays,
                                     (GHRFunc)predicate,
                                     user_data);
        return display;
}

guint
gdm_display_store_foreach_remove (GdmDisplayStore    *store,
                                  GdmDisplayStoreFunc func,
                                  gpointer            user_data)
{
        guint ret;

        g_return_val_if_fail (store != NULL, 0);
        g_return_val_if_fail (func != NULL, 0);

        ret = g_hash_table_foreach_remove (store->priv->displays,
                                           (GHRFunc)func,
                                           user_data);

        return ret;
}

void
gdm_display_store_add (GdmDisplayStore *store,
                       GdmDisplay      *display)
{
        char *id;

        g_return_if_fail (store != NULL);
        g_return_if_fail (display != NULL);

        gdm_display_get_id (display, &id, NULL);

        g_debug ("GdmDisplayStore: Adding display %s to store", id);

        g_hash_table_insert (store->priv->displays,
                             id,
                             g_object_ref (display));
}

static void
gdm_display_store_class_init (GdmDisplayStoreClass *klass)
{
        GObjectClass   *object_class = G_OBJECT_CLASS (klass);

        object_class->finalize = gdm_display_store_finalize;

        signals [DISPLAY_ADDED] =
                g_signal_new ("display-added",
                              G_TYPE_FROM_CLASS (object_class),
                              G_SIGNAL_RUN_LAST,
                              G_STRUCT_OFFSET (GdmDisplayStoreClass, display_added),
                              NULL,
                              NULL,
                              g_cclosure_marshal_VOID__STRING,
                              G_TYPE_NONE,
                              1, G_TYPE_STRING);
        signals [DISPLAY_REMOVED] =
                g_signal_new ("display-removed",
                              G_TYPE_FROM_CLASS (object_class),
                              G_SIGNAL_RUN_LAST,
                              G_STRUCT_OFFSET (GdmDisplayStoreClass, display_removed),
                              NULL,
                              NULL,
                              g_cclosure_marshal_VOID__STRING,
                              G_TYPE_NONE,
                              1, G_TYPE_STRING);

        g_type_class_add_private (klass, sizeof (GdmDisplayStorePrivate));
}

static void
display_unref (GdmDisplay *display)
{
        g_debug ("GdmDisplayStore: Unreffing display: %p", display);
        g_object_unref (display);
}

static void
gdm_display_store_init (GdmDisplayStore *store)
{

        store->priv = GDM_DISPLAY_STORE_GET_PRIVATE (store);

        store->priv->displays = g_hash_table_new_full (g_str_hash,
                                                       g_str_equal,
                                                       g_free,
                                                       (GDestroyNotify) display_unref);
}

static void
gdm_display_store_finalize (GObject *object)
{
        GdmDisplayStore *store;

        g_return_if_fail (object != NULL);
        g_return_if_fail (GDM_IS_DISPLAY_STORE (object));

        store = GDM_DISPLAY_STORE (object);

        g_return_if_fail (store->priv != NULL);

        g_hash_table_destroy (store->priv->displays);

        G_OBJECT_CLASS (gdm_display_store_parent_class)->finalize (object);
}

GdmDisplayStore *
gdm_display_store_new (void)
{
        GObject *object;

        object = g_object_new (GDM_TYPE_DISPLAY_STORE,
                               NULL);

        return GDM_DISPLAY_STORE (object);
}