/*
 * Copyright (C) 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: Cosimo Cecchi <cosimo.cecchi@collabora.co.uk>
 *          Sjoerd Simons <sjoerd.simons@collabora.co.uk>
 */

#include "config.h"

#include <telepathy-glib/util.h>
#include <telepathy-glib/account-manager.h>
#include <telepathy-glib/enums.h>
#include <telepathy-glib/defs.h>
#include <telepathy-glib/interfaces.h>

#include "empathy-account-manager.h"
#include "empathy-marshal.h"
#include "empathy-utils.h"

#define DEBUG_FLAG EMPATHY_DEBUG_ACCOUNT
#include <libempathy/empathy-debug.h>

#define GET_PRIV(obj) EMPATHY_GET_PRIV (obj, EmpathyAccountManager)

#define MC5_BUS_NAME "org.freedesktop.Telepathy.MissionControl5"

typedef struct {
  /* (owned) unique name -> (reffed) EmpathyAccount */
  GHashTable       *accounts;
  int               connected;
  int               connecting;
  gboolean          dispose_run;
  gboolean          ready;
  TpProxySignalConnection *proxy_signal;
  TpAccountManager *tp_manager;
  TpDBusDaemon *dbus;

  /* global presence */
  EmpathyAccount *global_account;

  TpConnectionPresenceType global_presence;
  gchar *global_status;
  gchar *global_status_message;
} EmpathyAccountManagerPriv;

enum {
  ACCOUNT_CREATED,
  ACCOUNT_DELETED,
  ACCOUNT_ENABLED,
  ACCOUNT_DISABLED,
  ACCOUNT_CHANGED,
  ACCOUNT_CONNECTION_CHANGED,
  GLOBAL_PRESENCE_CHANGED,
  NEW_CONNECTION,
  LAST_SIGNAL
};

enum {
  PROP_READY = 1,
};

static guint signals[LAST_SIGNAL];
static EmpathyAccountManager *manager_singleton = NULL;

G_DEFINE_TYPE (EmpathyAccountManager, empathy_account_manager, G_TYPE_OBJECT);

static void
emp_account_connection_cb (EmpathyAccount *account,
  GParamSpec *spec,
  gpointer manager)
{
  TpConnection *connection = empathy_account_get_connection (account);

  DEBUG ("Signalling connection %p of account %s",
      connection, empathy_account_get_unique_name (account));

  if (connection != NULL)
    g_signal_emit (manager, signals[NEW_CONNECTION], 0, connection);
}

static void
emp_account_enabled_cb (EmpathyAccount *account,
  GParamSpec *spec,
  gpointer manager)
{
  if (empathy_account_is_enabled (account))
    g_signal_emit (manager, signals[ACCOUNT_ENABLED], 0, account);
  else
    g_signal_emit (manager, signals[ACCOUNT_DISABLED], 0, account);
}

static void
emp_account_status_changed_cb (EmpathyAccount *account,
  TpConnectionStatus old,
  TpConnectionStatus new,
  TpConnectionStatusReason reason,
  gpointer user_data)
{
  EmpathyAccountManager *manager = EMPATHY_ACCOUNT_MANAGER (user_data);
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);

  switch (old)
    {
      case TP_CONNECTION_STATUS_CONNECTING:
        priv->connecting--;
        break;
      case TP_CONNECTION_STATUS_CONNECTED:
        priv->connected--;
        break;
      default:
        break;
    }

  switch (new)
    {
      case TP_CONNECTION_STATUS_CONNECTING:
        priv->connecting++;
        break;
      case TP_CONNECTION_STATUS_CONNECTED:
        priv->connected++;
        break;
      default:
        break;
    }

  g_signal_emit (manager, signals[ACCOUNT_CONNECTION_CHANGED], 0,
    account, reason, new, old);
}

static void
emp_account_manager_update_global_presence (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);
  TpConnectionPresenceType presence = TP_CONNECTION_PRESENCE_TYPE_OFFLINE;
  EmpathyAccount *account = NULL;
  GHashTableIter iter;
  gpointer value;

  g_hash_table_iter_init (&iter, priv->accounts);
  while (g_hash_table_iter_next (&iter, NULL, &value))
    {
      EmpathyAccount *a = EMPATHY_ACCOUNT (value);
      TpConnectionPresenceType p;

      g_object_get (a, "presence", &p, NULL);

      if (tp_connection_presence_type_cmp_availability (p, presence) > 0)
        {
          account = a;
          presence = p;
        }
    }

  priv->global_account = account;
  g_free (priv->global_status);
  g_free (priv->global_status_message);

  if (account == NULL)
    {
      priv->global_status = NULL;
      priv->global_status_message = NULL;
      return;
    }

  g_object_get (account,
    "presence", &priv->global_presence,
    "status", &priv->global_status,
    "status-message", &priv->global_status_message,
    NULL);
}

static void
emp_account_presence_changed_cb (EmpathyAccount *account,
  TpConnectionPresenceType presence,
  const gchar *status,
  const gchar *status_message,
  gpointer user_data)
{
  EmpathyAccountManager *manager = EMPATHY_ACCOUNT_MANAGER (user_data);
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);

  if (tp_connection_presence_type_cmp_availability (presence,
      priv->global_presence) > 0)
    {
      priv->global_account = account;

      priv->global_presence = presence;

      g_free (priv->global_status);
      priv->global_status = g_strdup (status);

      g_free (priv->global_status_message);
      priv->global_status_message = g_strdup (status_message);

      goto signal;
    }
  else if (priv->global_account == account)
    {
      emp_account_manager_update_global_presence (manager);
      goto signal;
    }

  return;
signal:
    g_signal_emit (manager, signals[GLOBAL_PRESENCE_CHANGED], 0,
      priv->global_presence, priv->global_status, priv->global_status_message);
}

static void
empathy_account_manager_check_ready (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);
  GHashTableIter iter;
  gpointer value;

  if (priv->ready)
    return;

  g_hash_table_iter_init (&iter, priv->accounts);
  while (g_hash_table_iter_next (&iter, NULL, &value))
    {
      EmpathyAccount *account = EMPATHY_ACCOUNT (value);
      gboolean ready;

      g_object_get (account, "ready", &ready, NULL);

      if (!ready)
        return;
    }

  priv->ready = TRUE;
  g_object_notify (G_OBJECT (manager), "ready");
}

static void
emp_account_ready_cb (GObject *obj, GParamSpec *spec, gpointer user_data)
{
  EmpathyAccountManager *manager = EMPATHY_ACCOUNT_MANAGER (user_data);
  EmpathyAccount *account = EMPATHY_ACCOUNT (obj);
  gboolean ready;

  g_object_get (account, "ready", &ready, NULL);

  if (!ready)
    return;

  g_signal_emit (manager, signals[ACCOUNT_CREATED], 0, account);

  g_signal_connect (account, "notify::connection",
    G_CALLBACK (emp_account_connection_cb), manager);

  g_signal_connect (account, "notify::enabled",
    G_CALLBACK (emp_account_enabled_cb), manager);

  g_signal_connect (account, "status-changed",
    G_CALLBACK (emp_account_status_changed_cb), manager);

  g_signal_connect (account, "presence-changed",
    G_CALLBACK (emp_account_presence_changed_cb), manager);

  empathy_account_manager_check_ready (manager);
}

static void
account_manager_got_all_cb (TpProxy *proxy,
    GHashTable *properties,
    const GError *error,
    gpointer user_data,
    GObject *weak_object)
{
  EmpathyAccountManager *manager = EMPATHY_ACCOUNT_MANAGER (weak_object);
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);
  GPtrArray *accounts;
  int i;

  if (error != NULL)
    {
      DEBUG ("Failed to get account manager properties: %s", error->message);
      return;
    }

  accounts = tp_asv_get_boxed (properties, "ValidAccounts",
    EMPATHY_ARRAY_TYPE_OBJECT);

  for (i = 0; i < accounts->len; i++)
    {
      EmpathyAccount *account;
      gchar *name = g_ptr_array_index (accounts, i);

      account = empathy_account_new (priv->dbus, name);
      g_hash_table_insert (priv->accounts, g_strdup (name), account);

      g_signal_connect (account, "notify::ready",
        G_CALLBACK (emp_account_ready_cb), manager);
    }

  empathy_account_manager_check_ready (manager);
}

static void
account_manager_name_owner_changed_cb (TpDBusDaemon *proxy,
    const gchar *arg0,
    const gchar *arg1,
    const gchar *arg2,
    gpointer user_data,
    GObject *weak_object)
{
  EmpathyAccountManager *manager = EMPATHY_ACCOUNT_MANAGER (weak_object);
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);

  tp_proxy_signal_connection_disconnect (priv->proxy_signal);
  priv->proxy_signal = NULL;

  priv->tp_manager = tp_account_manager_new (priv->dbus);
  tp_cli_dbus_properties_call_get_all (priv->tp_manager, -1,
    TP_IFACE_ACCOUNT_MANAGER,
    account_manager_got_all_cb,
    NULL,
    NULL,
    G_OBJECT (manager));
}

static void
empathy_account_manager_init (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv;
  TpProxy *mc5_proxy;

  priv = G_TYPE_INSTANCE_GET_PRIVATE (manager,
      EMPATHY_TYPE_ACCOUNT_MANAGER, EmpathyAccountManagerPriv);

  manager->priv = priv;
  priv->connected = priv->connecting = 0;
  priv->global_presence = TP_CONNECTION_PRESENCE_TYPE_UNSET;

  priv->accounts = g_hash_table_new_full (g_str_hash, g_str_equal,
      g_free, (GDestroyNotify) g_object_unref);

  priv->dbus = tp_dbus_daemon_dup (NULL);

  priv->proxy_signal = tp_cli_dbus_daemon_connect_to_name_owner_changed (
      priv->dbus,
      account_manager_name_owner_changed_cb,
      TP_ACCOUNT_MANAGER_BUS_NAME,
      NULL,
      G_OBJECT (manager),
      NULL);

  /* trigger MC5 starting */
  mc5_proxy = g_object_new (TP_TYPE_PROXY,
    "dbus-daemon", priv->dbus,
    "dbus-connection", tp_proxy_get_dbus_connection (TP_PROXY (priv->dbus)),
    "bus-name", MC5_BUS_NAME,
    "object-path", "/",
    NULL);

  tp_cli_dbus_peer_call_ping (mc5_proxy, -1, NULL, NULL, NULL, NULL);

  g_object_unref (mc5_proxy);
}

static void
do_finalize (GObject *obj)
{
  EmpathyAccountManager *manager = EMPATHY_ACCOUNT_MANAGER (obj);
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);

  g_hash_table_destroy (priv->accounts);

  G_OBJECT_CLASS (empathy_account_manager_parent_class)->finalize (obj);
}

static void
do_dispose (GObject *obj)
{
  EmpathyAccountManager *manager = EMPATHY_ACCOUNT_MANAGER (obj);
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);

  if (priv->dispose_run)
    return;

  priv->dispose_run = TRUE;

  if (priv->dbus == NULL)
    g_object_unref (priv->dbus);
  priv->dbus = NULL;

  G_OBJECT_CLASS (empathy_account_manager_parent_class)->dispose (obj);
}

static GObject *
do_constructor (GType type,
                guint n_construct_params,
                GObjectConstructParam *construct_params)
{
  GObject *retval;

  if (!manager_singleton)
    {
      retval = G_OBJECT_CLASS (empathy_account_manager_parent_class)->constructor (type,
                                                                                   n_construct_params,
                                                                                   construct_params);
      manager_singleton = EMPATHY_ACCOUNT_MANAGER (retval);
      g_object_add_weak_pointer (retval, (gpointer) &manager_singleton);
    }
  else
    {
      retval = g_object_ref (manager_singleton);
    }

  return retval;
}

static void
do_get_property (GObject *object,
    guint prop_id,
    GValue *value,
    GParamSpec *pspec)
{
  EmpathyAccountManager *manager = EMPATHY_ACCOUNT_MANAGER (object);
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);

  switch (prop_id)
    {
      case PROP_READY:
        g_value_set_boolean (value, priv->ready);
        break;
      default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
        break;
    }
}

static void
empathy_account_manager_class_init (EmpathyAccountManagerClass *klass)
{
  GObjectClass *oclass = G_OBJECT_CLASS (klass);

  oclass->finalize = do_finalize;
  oclass->dispose = do_dispose;
  oclass->constructor = do_constructor;
  oclass->get_property = do_get_property;

  g_object_class_install_property (oclass, PROP_READY,
    g_param_spec_boolean ("ready",
      "Ready",
      "Whether the initial state dump from the account manager is finished",
      FALSE,
      G_PARAM_STATIC_STRINGS | G_PARAM_READABLE));

  signals[ACCOUNT_CREATED] =
    g_signal_new ("account-created",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1, EMPATHY_TYPE_ACCOUNT);

  signals[ACCOUNT_DELETED] =
    g_signal_new ("account-deleted",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1, EMPATHY_TYPE_ACCOUNT);

  signals[ACCOUNT_ENABLED] =
    g_signal_new ("account-enabled",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1, EMPATHY_TYPE_ACCOUNT);

  signals[ACCOUNT_DISABLED] =
    g_signal_new ("account-disabled",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1, EMPATHY_TYPE_ACCOUNT);

  signals[ACCOUNT_CHANGED] =
    g_signal_new ("account-changed",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1, EMPATHY_TYPE_ACCOUNT);

  signals[ACCOUNT_CONNECTION_CHANGED] =
    g_signal_new ("account-connection-changed",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  _empathy_marshal_VOID__OBJECT_INT_UINT_UINT,
                  G_TYPE_NONE,
                  4, EMPATHY_TYPE_ACCOUNT,
                  G_TYPE_INT,   /* reason */
                  G_TYPE_UINT,  /* actual connection */
                  G_TYPE_UINT); /* previous connection */

  signals[GLOBAL_PRESENCE_CHANGED] =
    g_signal_new ("global-presence-changed",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  _empathy_marshal_VOID__UINT_STRING_STRING,
                  G_TYPE_NONE,
                  3, G_TYPE_UINT, /* Presence type */
                  G_TYPE_STRING,  /* status */
                  G_TYPE_STRING); /* stauts message*/

  signals[NEW_CONNECTION] =
    g_signal_new ("new-connection",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1, TP_TYPE_CONNECTION);

  g_type_class_add_private (oclass, sizeof (EmpathyAccountManagerPriv));
}

/* public methods */

EmpathyAccountManager *
empathy_account_manager_dup_singleton (void)
{
  return g_object_new (EMPATHY_TYPE_ACCOUNT_MANAGER, NULL);
}

EmpathyAccount *
empathy_account_manager_create (EmpathyAccountManager *manager,
	const gchar *connection_manager,
	const gchar *protocol,
	const gchar *display_name)
{
  /* FIXME */
  return NULL;
}


gboolean
empathy_account_manager_is_ready (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);

  return priv->ready;
}

int
empathy_account_manager_get_connected_accounts (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv;

  g_return_val_if_fail (EMPATHY_IS_ACCOUNT_MANAGER (manager), 0);

  priv = GET_PRIV (manager);

  return priv->connected;
}

int
empathy_account_manager_get_connecting_accounts (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv;

  g_return_val_if_fail (EMPATHY_IS_ACCOUNT_MANAGER (manager), 0);

  priv = GET_PRIV (manager);

  return priv->connecting;
}

/**
 * empathy_account_manager_get_count:
 * @manager: a #EmpathyAccountManager
 *
 * Get the number of accounts.
 *
 * Returns: the number of accounts.
 **/
int
empathy_account_manager_get_count (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv;

  g_return_val_if_fail (EMPATHY_IS_ACCOUNT_MANAGER (manager), 0);

  priv = GET_PRIV (manager);

  return g_hash_table_size (priv->accounts);
}

EmpathyAccount *
empathy_account_manager_get_account (EmpathyAccountManager *manager,
                                     TpConnection          *connection)
{
  EmpathyAccountManagerPriv *priv;
  GHashTableIter iter;
  gpointer value;

  g_return_val_if_fail (EMPATHY_IS_ACCOUNT_MANAGER (manager), 0);

  priv = GET_PRIV (manager);

  g_hash_table_iter_init (&iter, priv->accounts);
  while (g_hash_table_iter_next (&iter, NULL, &value))
    {
      EmpathyAccount *account = EMPATHY_ACCOUNT (value);

      if (connection == empathy_account_get_connection (account))
          return account;
    }

  return NULL;
}

EmpathyAccount *
empathy_account_manager_lookup (EmpathyAccountManager *manager,
    const gchar *unique_name)
{
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);
  EmpathyAccount *account;

  account = g_hash_table_lookup (priv->accounts, unique_name);

  if (account != NULL)
    g_object_ref (account);

  return account;
}

GList *
empathy_account_manager_dup_accounts (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv;
  GList *ret;

  g_return_val_if_fail (EMPATHY_IS_ACCOUNT_MANAGER (manager), NULL);

  priv = GET_PRIV (manager);

  ret = g_hash_table_get_values (priv->accounts);
  g_list_foreach (ret, (GFunc) g_object_ref, NULL);

  return ret;
}

/**
 * empathy_account_manager_dup_connections:
 * @manager: a #EmpathyAccountManager
 *
 * Get a #GList of all ready #TpConnection. The list must be freed with
 * g_list_free, and its elements must be unreffed.
 *
 * Returns: the list of connections
 **/
GList *
empathy_account_manager_dup_connections (EmpathyAccountManager *manager)
{
  EmpathyAccountManagerPriv *priv;
  GHashTableIter iter;
  gpointer value;
  GList *ret = NULL;

  g_return_val_if_fail (EMPATHY_IS_ACCOUNT_MANAGER (manager), NULL);

  priv = GET_PRIV (manager);

  g_hash_table_iter_init (&iter, priv->accounts);
  while (g_hash_table_iter_next (&iter, NULL, &value))
    {
      EmpathyAccount *account = EMPATHY_ACCOUNT (value);
      TpConnection *connection;

      connection = empathy_account_get_connection (account);
      if (connection != NULL)
        ret = g_list_prepend (ret, g_object_ref (connection));
    }

  return ret;
}

void
empathy_account_manager_remove (EmpathyAccountManager *manager,
    EmpathyAccount *account)
{
  /* FIXME */
}


void
empathy_account_manager_request_global_presence (
  EmpathyAccountManager *manager,
  TpConnectionPresenceType type,
  const gchar *status,
  const gchar *message)
{
  /* FIXME should remember requested presence and set it on new accounts
     as well */
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);
  GHashTableIter iter;
  gpointer value;

  g_hash_table_iter_init (&iter, priv->accounts);
  while (g_hash_table_iter_next (&iter, NULL, &value))
    {
      EmpathyAccount *account = EMPATHY_ACCOUNT (value);
      gboolean ready;

      g_object_get (account, "ready", &ready, NULL);

      if (ready)
        empathy_account_request_presence (account, type, status, message);
    }
}

TpConnectionPresenceType
empathy_account_manager_get_global_presence (
  EmpathyAccountManager *manager,
  gchar **status,
  gchar **message)
{
  EmpathyAccountManagerPriv *priv = GET_PRIV (manager);

  if (status != NULL)
    *status = g_strdup (priv->global_status);
  if (message != NULL)
    *message = g_strdup (priv->global_status_message);

  return priv->global_presence;
}