/*

 * gabble-presence.c - Gabble's per-contact presence structure

 * Copyright (C) 2005 Collabora Ltd.

 *  and/or its subsidiaries. All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include <string.h>

#include <glib.h>

#include "gabble-presence-cache.h"

#include "gabble-presence.h"

#include "util.h"

#include "config.h"

#define DEBUG_FLAG GABBLE_DEBUG_PRESENCE

#include "debug.h"

#ifndef EMULATOR

G_DEFINE_TYPE (GabblePresence, gabble_presence, G_TYPE_OBJECT);

#endif

#ifdef EMULATOR

#include "libgabble_wsd_solution.h"

    GET_STATIC_VAR_FROM_TLS(gabble_presence_parent_class,gabble_presence,gpointer)

	#define gabble_presence_parent_class (*GET_WSD_VAR_NAME(gabble_presence_parent_class,gabble_presence,s)())

	GET_STATIC_VAR_FROM_TLS(g_define_type_id,gabble_presence,GType)

	#define g_define_type_id (*GET_WSD_VAR_NAME(g_define_type_id,gabble_presence,s)())

static void gabble_presence_init (GabblePresence *self);

static void gabble_presence_class_init (GabblePresenceClass *klass);

static void gabble_presence_class_intern_init (gpointer klass) 

{ 

gabble_presence_parent_class = g_type_class_peek_parent (klass); 

gabble_presence_class_init ((GabblePresenceClass*) klass); 

}

 EXPORT_C GType gabble_presence_get_type (void) 

 { 

 if ((g_define_type_id == 0)) 

 { static const GTypeInfo g_define_type_info = 

 	{ sizeof (GabblePresenceClass), (GBaseInitFunc) ((void *)0), (GBaseFinalizeFunc) ((void *)0), (GClassInitFunc) gabble_presence_class_intern_init, (GClassFinalizeFunc) ((void *)0), ((void *)0), sizeof (GabblePresence), 0, (GInstanceInitFunc) gabble_presence_init, ((void *)0) }; g_define_type_id = g_type_register_static ( ((GType) ((20) << (2))), g_intern_static_string ("GabblePresence"), &g_define_type_info, (GTypeFlags) 0); { {} ; } } return g_define_type_id; 

 } ;

#endif

#define GABBLE_PRESENCE_PRIV(account) ((GabblePresencePrivate *)account->priv)

typedef struct _Resource Resource;

struct _Resource {

    gchar *name;

    GabblePresenceCapabilities caps;

    guint caps_serial;

    GabblePresenceId status;

    gchar *status_message;

    gint8 priority;

};

typedef struct _GabblePresencePrivate GabblePresencePrivate;

struct _GabblePresencePrivate {

    gchar *no_resource_status_message;

    GSList *resources;

};

static Resource *

_resource_new (gchar *name)

{

  Resource *new = g_new (Resource, 1);

  new->name = name;

  new->caps = PRESENCE_CAP_NONE;

  new->status = GABBLE_PRESENCE_OFFLINE;

  new->status_message = NULL;

  new->priority = 0;

  new->caps_serial = 0;

  return new;

}

static void

_resource_free (Resource *resource)

{

  g_free (resource->status_message);

  g_free (resource);

}

static void

gabble_presence_finalize (GObject *object)

{

  GSList *i;

  GabblePresence *presence = GABBLE_PRESENCE (object);

  GabblePresencePrivate *priv = GABBLE_PRESENCE_PRIV (presence);

  for (i = priv->resources; NULL != i; i = i->next)

    _resource_free (i->data);

  g_slist_free (priv->resources);

  g_free (presence->nickname);

  g_free (priv->no_resource_status_message);

}

static void

gabble_presence_class_init (GabblePresenceClass *klass)

{

  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  g_type_class_add_private (object_class, sizeof (GabblePresencePrivate));

  object_class->finalize = gabble_presence_finalize;

}

static void

gabble_presence_init (GabblePresence *self)

{

  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,

      GABBLE_TYPE_PRESENCE, GabblePresencePrivate);

  ((GabblePresencePrivate *)self->priv)->resources = NULL;

}

GabblePresence*

gabble_presence_new (void)

{

  return g_object_new (GABBLE_TYPE_PRESENCE, NULL);

}

const gchar *

gabble_presence_pick_resource_by_caps (

    GabblePresence *presence,

    GabblePresenceCapabilities caps)

{

  GabblePresencePrivate *priv = GABBLE_PRESENCE_PRIV (presence);

  GSList *i;

  Resource *chosen = NULL;

  for (i = priv->resources; NULL != i; i = i->next)

    {

      Resource *res = (Resource *) i->data;

      if ((res->priority >= 0) &&

          ((res->caps & caps) == caps) &&

          (NULL == chosen || res->priority > chosen->priority))

        chosen = res;

    }

  if (chosen)

    return chosen->name;

  else

    return NULL;

}

gboolean

gabble_presence_resource_has_caps (GabblePresence *presence,

                                   const gchar *resource,

                                   GabblePresenceCapabilities caps)

{

  GabblePresencePrivate *priv = GABBLE_PRESENCE_PRIV (presence);

  GSList *i;

  for (i = priv->resources; NULL != i; i = i->next)

    {

      Resource *res = (Resource *) i->data;

      if (!g_strdiff (res->name, resource) && (res->caps & caps))

        return TRUE;

    }

  return FALSE;

}

void

gabble_presence_set_capabilities (GabblePresence *presence,

                                  const gchar *resource,

                                  GabblePresenceCapabilities caps,

                                  guint serial)

{

  GabblePresencePrivate *priv = GABBLE_PRESENCE_PRIV (presence);

  GSList *i;

  g_message("[gabble_presence_set_capabilities]\n");  

  presence->caps = 0;

  gabble_debug (DEBUG_FLAG, "about to add caps %u to resource %s with serial %u", caps, resource,

    serial);

  for (i = priv->resources; NULL != i; i = i->next)

    {

      Resource *tmp = (Resource *) i->data;

      if (0 == strcmp (tmp->name, resource))

        {

          gabble_debug (DEBUG_FLAG, "found resource %s", resource);

          if (serial > tmp->caps_serial)

            {

              gabble_debug (DEBUG_FLAG, "new serial %u, old %u, clearing caps", serial,

                tmp->caps_serial);

              tmp->caps = 0;

              tmp->caps_serial = serial;

            }

          if (serial >= tmp->caps_serial)

            {

              gabble_debug (DEBUG_FLAG, "adding caps %u to resource %s", caps, resource);

              tmp->caps |= caps;

              gabble_debug (DEBUG_FLAG, "resource %s caps now %u", resource, tmp->caps);

            }

        }

      presence->caps |= tmp->caps;

    }

  g_message("[leaving connect_callbacks\n]");

  gabble_debug (DEBUG_FLAG, "total caps now %u", presence->caps);

}

static Resource *

_find_resource (GabblePresence *presence, const gchar *resource)

{

  GSList *i;

  GabblePresencePrivate *priv = GABBLE_PRESENCE_PRIV (presence);

  for (i = priv->resources; NULL != i; i = i->next)

    {

      Resource *res = (Resource *) i->data;

      if (0 == strcmp (res->name, resource))

        return res;

    }

  return NULL;

}

gboolean

gabble_presence_update (GabblePresence *presence,

                        const gchar *resource,

                        GabblePresenceId status,

                        const gchar *status_message,

                        gint8 priority)

{

  GabblePresencePrivate *priv = GABBLE_PRESENCE_PRIV (presence);

  Resource *res;

  GabblePresenceId old_status;

  gchar *old_status_message;

  GSList *i;

  gint8 prio;

  gboolean ret = FALSE;

  /* save our current state */

  old_status = presence->status;

  old_status_message = g_strdup (presence->status_message);

  if (NULL == resource)

    {

      /* presence from a JID with no resource: free all resources and set

       * presence directly */

      for (i = priv->resources; i; i = i->next)

        _resource_free (i->data);

      g_slist_free (priv->resources);

      priv->resources = NULL;

      if (g_strdiff (priv->no_resource_status_message, status_message))

        {

          g_free (priv->no_resource_status_message);

          priv->no_resource_status_message = g_strdup (status_message);

        }

      presence->status = status;

      presence->status_message = priv->no_resource_status_message;

      goto OUT;

    }

  res = _find_resource (presence, resource);

  /* remove, create or update a Resource as appropriate */

  if (GABBLE_PRESENCE_OFFLINE == status &&

      NULL == status_message)

    {

      if (NULL != res)

        {

          priv->resources = g_slist_remove (priv->resources, res);

          _resource_free (res);

          res = NULL;

        }

    }

  else

    {

      if (NULL == res)

        {

          res = _resource_new (g_strdup (resource));

          priv->resources = g_slist_append (priv->resources, res);

        }

      res->status = status;

      if (g_strdiff (res->status_message, status_message))

        {

          g_free (res->status_message);

          res->status_message = g_strdup (status_message);

        }

      res->priority = priority;

    }

  /* select the most preferable Resource and update presence->* based on our

   * choice */

  presence->caps = 0;

  presence->status = GABBLE_PRESENCE_OFFLINE;

  /* use the status message from any offline Resource we're

   * keeping around just because it has a message on it */

  presence->status_message = res ? res->status_message : NULL;

  prio = -128;

  for (i = priv->resources; NULL != i; i = i->next)

    {

      Resource *res = (Resource *) i->data;

      presence->caps |= res->caps;

      /* trump existing status & message if it's more present

       * or has the same presence and a higher priority */

      if (res->status > presence->status ||

          (res->status == presence->status && res->priority > prio))

        {

          presence->status = res->status;

          presence->status_message = res->status_message;

          prio = res->priority;

        }

    }

OUT:

  /* detect changes */

  if (presence->status != old_status ||

      g_strdiff (presence->status_message, old_status_message))

    ret = TRUE;

  g_free (old_status_message);

  return ret;

}

LmMessage *

gabble_presence_as_message (GabblePresence *presence, const gchar *resource)

{

  LmMessage *message;

  LmMessageNode *node;

  LmMessageSubType subtype;

  Resource *res = _find_resource (presence, resource);

  g_assert (NULL != res);

  if (presence->status == GABBLE_PRESENCE_OFFLINE)

    subtype = LM_MESSAGE_SUB_TYPE_UNAVAILABLE;

  else

    subtype = LM_MESSAGE_SUB_TYPE_AVAILABLE;

  message = lm_message_new_with_sub_type (NULL, LM_MESSAGE_TYPE_PRESENCE,

              subtype);

  node = lm_message_get_node (message);

  switch (presence->status)

    {

    case GABBLE_PRESENCE_AVAILABLE:

    case GABBLE_PRESENCE_OFFLINE:

    case GABBLE_PRESENCE_HIDDEN:

      break;

    case GABBLE_PRESENCE_AWAY:

      lm_message_node_add_child (node, "show", JABBER_PRESENCE_SHOW_AWAY);

      break;

    case GABBLE_PRESENCE_CHAT:

      lm_message_node_add_child (node, "show", JABBER_PRESENCE_SHOW_CHAT);

      break;

    case GABBLE_PRESENCE_DND:

      lm_message_node_add_child (node, "show", JABBER_PRESENCE_SHOW_DND);

      break;

    case GABBLE_PRESENCE_XA:

      lm_message_node_add_child (node, "show", JABBER_PRESENCE_SHOW_XA);

      break;

    default:

      g_critical ("%s: Unexpected Telepathy presence type", G_STRFUNC);

      break;

    }

  if (presence->status_message)

      lm_message_node_add_child (node, "status", presence->status_message);

  if (res->priority)

    {

      gchar *priority = g_strdup_printf ("%d", res->priority);

      lm_message_node_add_child (node, "priority", priority);

      g_free (priority);

    }

  return message;

}

gchar *

gabble_presence_dump (GabblePresence *presence)

{

  GSList *i;

  GString *ret = g_string_new ("");

  GabblePresencePrivate *priv = GABBLE_PRESENCE_PRIV (presence);

  g_string_append_printf (ret,

    "nickname: %s\n"

    "accumulated status: %d\n"

    "accumulated status msg: %s\n"

    "accumulated capabilities: %d\n"

    "kept while unavailable: %d\n"

    "resources:\n", presence->nickname, presence->status,

    presence->status_message, presence->caps,

    presence->keep_unavailable);

  for (i = priv->resources; i; i = i->next)

    {

      Resource *res = (Resource *) i->data;

      g_string_append_printf(ret,

        "  %s\n"

        "    capabilities: %d\n"

        "    status: %d\n"

        "    status msg: %s\n"

        "    priority: %d\n", res->name, res->caps, res->status,

        res->status_message, res->priority);

    }

  if (priv->resources == NULL)

    g_string_append_printf(ret, "  (none)\n");

  return g_string_free (ret, FALSE);

}