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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2007-2008 Collabora Ltd.
 *
 * 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
 * 
 * Authors: Xavier Claessens <xclaesse@gmail.com>
 */

#include <config.h>

#include <string.h>

#include <libtelepathy/tp-constants.h>

#include "empathy-contact-manager.h"
#include "empathy-contact-list.h"
#include "empathy-utils.h"
#include "empathy-debug.h"

#define GET_PRIV(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
               EMPATHY_TYPE_CONTACT_MANAGER, EmpathyContactManagerPriv))

#define DEBUG_DOMAIN "ContactManager"

struct _EmpathyContactManagerPriv {
    GHashTable     *lists;
    MissionControl *mc;
};

static void empathy_contact_manager_class_init (EmpathyContactManagerClass *klass);
static void empathy_contact_manager_init       (EmpathyContactManager      *manager);
static void contact_manager_iface_init         (EmpathyContactListIface    *iface);

G_DEFINE_TYPE_WITH_CODE (EmpathyContactManager, empathy_contact_manager, G_TYPE_OBJECT,
             G_IMPLEMENT_INTERFACE (EMPATHY_TYPE_CONTACT_LIST,
                        contact_manager_iface_init));

static void
contact_manager_members_changed_cb (EmpathyTpContactList  *list,
                    EmpathyContact        *contact,
                    EmpathyContact        *actor,
                    guint                  reason,
                    gchar                 *message,
                    gboolean               is_member,
                    EmpathyContactManager *manager)
{
    g_signal_emit_by_name (manager, "members-changed",
                   contact, actor, reason, message, is_member);
}

static void
contact_manager_pendings_changed_cb (EmpathyTpContactList  *list,
                     EmpathyContact        *contact,
                     EmpathyContact        *actor,
                     guint                  reason,
                     gchar                 *message,
                     gboolean               is_pending,
                     EmpathyContactManager *manager)
{
    g_signal_emit_by_name (manager, "pendings-changed",
                   contact, actor, reason, message, is_pending);
}

static void
contact_manager_groups_changed_cb (EmpathyTpContactList  *list,
                   EmpathyContact        *contact,
                   gchar                 *group,
                   gboolean               is_member,
                   EmpathyContactManager *manager)
{
    g_signal_emit_by_name (manager, "groups-changed",
                   contact, group, is_member);
}

static void contact_manager_destroy_cb (EmpathyTpContactList  *list,
                    EmpathyContactManager *manager);

static void
contact_manager_disconnect_foreach (gpointer key,
                    gpointer value,
                    gpointer user_data)
{
    EmpathyTpContactList  *list = value;
    EmpathyContactManager *manager = user_data;

    /* Disconnect signals from the list */
    g_signal_handlers_disconnect_by_func (list,
                          contact_manager_members_changed_cb,
                          manager);
    g_signal_handlers_disconnect_by_func (list,
                          contact_manager_pendings_changed_cb,
                          manager);
    g_signal_handlers_disconnect_by_func (list,
                          contact_manager_groups_changed_cb,
                          manager);
    g_signal_handlers_disconnect_by_func (list,
                          contact_manager_destroy_cb,
                          manager);
}

static void
contact_manager_destroy_cb (EmpathyTpContactList  *list,
                EmpathyContactManager *manager)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    McAccount                 *account;

    account = empathy_tp_contact_list_get_account (list);

    empathy_debug (DEBUG_DOMAIN, "Removing account: %s",
               mc_account_get_display_name (account));

    contact_manager_disconnect_foreach (account, list, manager);
    g_hash_table_remove (priv->lists, account);
}

static void
contact_manager_add_account (EmpathyContactManager *manager,
                 McAccount             *account)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    EmpathyTpContactList      *list;

    if (g_hash_table_lookup (priv->lists, account)) {
        return;
    }

    empathy_debug (DEBUG_DOMAIN, "Adding new account: %s",
               mc_account_get_display_name (account));

    list = empathy_tp_contact_list_new (account);
    if (!list) {
        return;
    }

    g_hash_table_insert (priv->lists, g_object_ref (account), list);

    /* Connect signals */
    g_signal_connect (list, "members-changed",
              G_CALLBACK (contact_manager_members_changed_cb),
              manager);
    g_signal_connect (list, "pendings-changed",
              G_CALLBACK (contact_manager_pendings_changed_cb),
              manager);
    g_signal_connect (list, "groups-changed",
              G_CALLBACK (contact_manager_groups_changed_cb),
              manager);
    g_signal_connect (list, "destroy",
              G_CALLBACK (contact_manager_destroy_cb),
              manager);
}

static void
contact_manager_status_changed_cb (MissionControl           *mc,
                   TpConnectionStatus        status,
                   McPresence                presence,
                   TpConnectionStatusReason  reason,
                   const gchar              *unique_name,
                   EmpathyContactManager    *manager)
{
    McAccount *account;

    if (status != TP_CONNECTION_STATUS_CONNECTED) {
        /* We only care about newly connected accounts */
        return;
    }

    account = mc_account_lookup (unique_name);
    contact_manager_add_account (manager, account);
    g_object_unref (account);
}

static void
contact_manager_finalize (GObject *object)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (object);

    dbus_g_proxy_disconnect_signal (DBUS_G_PROXY (priv->mc),
                    "AccountStatusChanged",
                    G_CALLBACK (contact_manager_status_changed_cb),
                    object);

    g_hash_table_foreach (priv->lists,
                  contact_manager_disconnect_foreach,
                  object);
    g_hash_table_destroy (priv->lists);
    g_object_unref (priv->mc);
}

static void
empathy_contact_manager_class_init (EmpathyContactManagerClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    object_class->finalize = contact_manager_finalize;

    g_type_class_add_private (object_class, sizeof (EmpathyContactManagerPriv));
}

static void
empathy_contact_manager_init (EmpathyContactManager *manager)
{
    EmpathyContactManagerPriv *priv;
    GSList                    *accounts, *l;

    priv = GET_PRIV (manager);

    priv->lists = g_hash_table_new_full (empathy_account_hash,
                         empathy_account_equal,
                         (GDestroyNotify) g_object_unref,
                         (GDestroyNotify) g_object_unref);

    priv->mc = empathy_mission_control_new ();

    dbus_g_proxy_connect_signal (DBUS_G_PROXY (priv->mc),
                     "AccountStatusChanged",
                     G_CALLBACK (contact_manager_status_changed_cb),
                     manager, NULL);

    /* Get ContactList for existing connections */
    accounts = mission_control_get_online_connections (priv->mc, NULL);
    for (l = accounts; l; l = l->next) {
        contact_manager_add_account (manager, l->data);
        g_object_unref (l->data);
    }
    g_slist_free (accounts);
}

EmpathyContactManager *
empathy_contact_manager_new (void)
{
    static EmpathyContactManager *manager = NULL;

    if (!manager) {
        manager = g_object_new (EMPATHY_TYPE_CONTACT_MANAGER, NULL);
        g_object_add_weak_pointer (G_OBJECT (manager), (gpointer) &manager);
    } else {
        g_object_ref (manager);
    }

    return manager;
}

EmpathyTpContactList *
empathy_contact_manager_get_list (EmpathyContactManager *manager,
                  McAccount             *account)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);

    g_return_val_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager), NULL);
    g_return_val_if_fail (MC_IS_ACCOUNT (account), NULL);

    return g_hash_table_lookup (priv->lists, account);
}

static void
contact_manager_add (EmpathyContactList *manager,
             EmpathyContact     *contact,
             const gchar        *message)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    EmpathyContactList        *list;
    McAccount                 *account;

    g_return_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager));

    account = empathy_contact_get_account (contact);
    list = g_hash_table_lookup (priv->lists, account);

    if (list) {
        empathy_contact_list_add (list, contact, message);
    }
}

static void
contact_manager_remove (EmpathyContactList *manager,
            EmpathyContact      *contact,
            const gchar        *message)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    EmpathyContactList        *list;
    McAccount                 *account;

    g_return_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager));

    account = empathy_contact_get_account (contact);
    list = g_hash_table_lookup (priv->lists, account);

    if (list) {
        empathy_contact_list_remove (list, contact, message);
    }
}

static void
contact_manager_get_members_foreach (McAccount             *account,
                     EmpathyTpContactList  *list,
                     GList                **contacts)
{
    GList *l;

    l = empathy_contact_list_get_members (EMPATHY_CONTACT_LIST (list));
    *contacts = g_list_concat (*contacts, l);
}

static GList *
contact_manager_get_members (EmpathyContactList *manager)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    GList                     *contacts = NULL;

    g_return_val_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager), NULL);

    g_hash_table_foreach (priv->lists,
                  (GHFunc) contact_manager_get_members_foreach,
                  &contacts);

    return contacts;
}

static void
contact_manager_get_pendings_foreach (McAccount             *account,
                      EmpathyTpContactList  *list,
                      GList                **contacts)
{
    GList *l;

    l = empathy_contact_list_get_pendings (EMPATHY_CONTACT_LIST (list));
    *contacts = g_list_concat (*contacts, l);
}

static GList *
contact_manager_get_pendings (EmpathyContactList *manager)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    GList                     *contacts = NULL;

    g_return_val_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager), NULL);

    g_hash_table_foreach (priv->lists,
                  (GHFunc) contact_manager_get_pendings_foreach,
                  &contacts);

    return contacts;
}

static void
contact_manager_get_all_groups_foreach (McAccount             *account,
                    EmpathyTpContactList  *list,
                    GList                **all_groups)
{
    GList *groups, *l;

    groups = empathy_contact_list_get_all_groups (EMPATHY_CONTACT_LIST (list));
    for (l = groups; l; l = l->next) {
        if (!g_list_find_custom (*all_groups,
                     l->data,
                     (GCompareFunc) strcmp)) {
            *all_groups = g_list_prepend (*all_groups, l->data);
        } else {
            g_free (l->data);
        }
    }

    g_list_free (groups);
}

static GList *
contact_manager_get_all_groups (EmpathyContactList *manager)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    GList                     *groups = NULL;

    g_return_val_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager), NULL);

    g_hash_table_foreach (priv->lists,
                  (GHFunc) contact_manager_get_all_groups_foreach,
                  &groups);

    return groups;
}

static GList *
contact_manager_get_groups (EmpathyContactList *manager,
                EmpathyContact     *contact)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    EmpathyContactList        *list;
    McAccount                 *account;

    g_return_val_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager), NULL);

    account = empathy_contact_get_account (contact);
    list = g_hash_table_lookup (priv->lists, account);

    if (list) {
        return empathy_contact_list_get_groups (list, contact);
    }

    return NULL;
}

static void
contact_manager_add_to_group (EmpathyContactList *manager,
                  EmpathyContact     *contact,
                  const gchar        *group)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    EmpathyContactList        *list;
    McAccount                 *account;

    g_return_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager));

    account = empathy_contact_get_account (contact);
    list = g_hash_table_lookup (priv->lists, account);

    if (list) {
        empathy_contact_list_add_to_group (list, contact, group);
    }
}

static void
contact_manager_remove_from_group (EmpathyContactList *manager,
                   EmpathyContact     *contact,
                   const gchar        *group)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    EmpathyContactList        *list;
    McAccount                 *account;

    g_return_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager));

    account = empathy_contact_get_account (contact);
    list = g_hash_table_lookup (priv->lists, account);

    if (list) {
        empathy_contact_list_remove_from_group (list, contact, group);
    }
}

typedef struct {
    const gchar *old_group;
    const gchar *new_group;
} RenameGroupData;

static void
contact_manager_rename_group_foreach (McAccount            *account,
                      EmpathyTpContactList *list,
                      RenameGroupData      *data)
{
    empathy_contact_list_rename_group (EMPATHY_CONTACT_LIST (list),
                       data->old_group,
                       data->new_group);
}

static void
contact_manager_rename_group (EmpathyContactList *manager,
                  const gchar        *old_group,
                  const gchar        *new_group)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    RenameGroupData            data;

    g_return_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager));

    data.old_group = old_group;
    data.new_group = new_group;
    g_hash_table_foreach (priv->lists,
                  (GHFunc) contact_manager_rename_group_foreach,
                  &data);
}

static void contact_manager_remove_group_foreach (McAccount *account,
                          EmpathyTpContactList *list,
                          const gchar *group)
{
    empathy_contact_list_remove_group (EMPATHY_CONTACT_LIST (list),
                       group);
}

static void
contact_manager_remove_group (EmpathyContactList *manager,
                  const gchar *group)
{
    EmpathyContactManagerPriv *priv = GET_PRIV (manager);
    
    g_return_if_fail (EMPATHY_IS_CONTACT_MANAGER (manager));

    g_hash_table_foreach (priv->lists,
                  (GHFunc) contact_manager_remove_group_foreach,
                  (gpointer) group);
}

static void
contact_manager_iface_init (EmpathyContactListIface *iface)
{
    iface->add               = contact_manager_add;
    iface->remove            = contact_manager_remove;
    iface->get_members       = contact_manager_get_members;
    iface->get_pendings      = contact_manager_get_pendings;
    iface->get_all_groups    = contact_manager_get_all_groups;
    iface->get_groups        = contact_manager_get_groups;
    iface->add_to_group      = contact_manager_add_to_group;
    iface->remove_from_group = contact_manager_remove_from_group;
    iface->rename_group      = contact_manager_rename_group;
    iface->remove_group  = contact_manager_remove_group;
}