/*
 * This file Copyright (C) 2009-2016 Mnemosyne LLC
 *
 * It may be used under the GNU GPL versions 2 or 3
 * or any future license endorsed by Mnemosyne LLC.
 *
 */

#include <cassert>
#include <iostream>

#include <QApplication>
#include <QByteArray>
#include <QClipboard>
#include <QCoreApplication>
#include <QDebug>
#include <QDesktopServices>
#include <QFile>
#include <QFileInfo>
#include <QMessageBox>
#include <QStyle>
#include <QTextStream>

#include <libtransmission/transmission.h>
#include <libtransmission/session-id.h>
#include <libtransmission/utils.h> // tr_free
#include <libtransmission/variant.h>

#include "AddData.h"
#include "Prefs.h"
#include "RpcQueue.h"
#include "Session.h"
#include "SessionDialog.h"
#include "Torrent.h"
#include "Utils.h"

/***
****
***/

namespace
{
  typedef Torrent::KeyList KeyList;
  const KeyList& getInfoKeys () { return Torrent::getInfoKeys (); }
  const KeyList& getStatKeys () { return Torrent::getStatKeys (); }
  const KeyList& getExtraStatKeys () { return Torrent::getExtraStatKeys (); }

  void
  addList (tr_variant * list, const KeyList& keys)
  {
    tr_variantListReserve (list, keys.size ());
    for (const tr_quark key: keys)
      tr_variantListAddQuark (list, key);
  }

  // If this object is passed as "ids" (compared by address), then recently active torrents are queried.
  const QSet<int> recentlyActiveIds = QSet<int>() << -1;

  // If this object is passed as "ids" (compared by being empty), then all torrents are queried.
  const QSet<int> allIds;
}

void
Session::sessionSet (const tr_quark key, const QVariant& value)
{
  tr_variant args;
  tr_variantInitDict (&args, 1);
  switch (value.type ())
    {
      case QVariant::Bool:   tr_variantDictAddBool (&args, key, value.toBool ()); break;
      case QVariant::Int:    tr_variantDictAddInt (&args, key, value.toInt ()); break;
      case QVariant::Double: tr_variantDictAddReal (&args, key, value.toDouble ()); break;
      case QVariant::String: tr_variantDictAddStr (&args, key, value.toString ().toUtf8 ().constData ()); break;
      default:               assert (false);
    }

  exec ("session-set", &args);
}

void
Session::portTest ()
{
  RpcQueue * q = new RpcQueue ();

  q->add (
    [this] ()
    {
      return exec ("port-test", nullptr);
    });

  q->add (
    [this] (const RpcResponse& r)
    {
      bool isOpen = false;
      if (r.success)
        tr_variantDictFindBool (r.args.get (), TR_KEY_port_is_open, &isOpen);

      emit portTested (isOpen);
    });

  q->run ();
}

void
Session::copyMagnetLinkToClipboard (int torrentId)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  tr_variantListAddInt (tr_variantDictAddList (&args, TR_KEY_ids, 1), torrentId);
  tr_variantListAddStr (tr_variantDictAddList (&args, TR_KEY_fields, 1), "magnetLink");

  RpcQueue * q = new RpcQueue ();

  q->add (
    [this, &args] ()
    {
      return exec (TR_KEY_torrent_get, &args);
    });

  q->add (
    [this] (const RpcResponse& r)
    {
      tr_variant * torrents;
      tr_variant * child;
      const char * str;

      if (tr_variantDictFindList (r.args.get (), TR_KEY_torrents, &torrents)
          && (child = tr_variantListChild (torrents, 0))
          && tr_variantDictFindStr (child, TR_KEY_magnetLink, &str, NULL))
        qApp->clipboard ()->setText (QString::fromUtf8 (str));
    });

  q->run ();
}

void
Session::updatePref (int key)
{
  if (myPrefs.isCore (key)) switch (key)
    {
      case Prefs::ALT_SPEED_LIMIT_DOWN:
      case Prefs::ALT_SPEED_LIMIT_ENABLED:
      case Prefs::ALT_SPEED_LIMIT_TIME_BEGIN:
      case Prefs::ALT_SPEED_LIMIT_TIME_DAY:
      case Prefs::ALT_SPEED_LIMIT_TIME_ENABLED:
      case Prefs::ALT_SPEED_LIMIT_TIME_END:
      case Prefs::ALT_SPEED_LIMIT_UP:
      case Prefs::BLOCKLIST_DATE:
      case Prefs::BLOCKLIST_ENABLED:
      case Prefs::BLOCKLIST_URL:
      case Prefs::DHT_ENABLED:
      case Prefs::DOWNLOAD_QUEUE_ENABLED:
      case Prefs::DOWNLOAD_QUEUE_SIZE:
      case Prefs::DSPEED:
      case Prefs::DSPEED_ENABLED:
      case Prefs::IDLE_LIMIT:
      case Prefs::IDLE_LIMIT_ENABLED:
      case Prefs::INCOMPLETE_DIR:
      case Prefs::INCOMPLETE_DIR_ENABLED:
      case Prefs::LPD_ENABLED:
      case Prefs::PEER_LIMIT_GLOBAL:
      case Prefs::PEER_LIMIT_TORRENT:
      case Prefs::PEER_PORT:
      case Prefs::PEER_PORT_RANDOM_ON_START:
      case Prefs::QUEUE_STALLED_MINUTES:
      case Prefs::PEX_ENABLED:
      case Prefs::PORT_FORWARDING:
      case Prefs::RENAME_PARTIAL_FILES:
      case Prefs::SCRIPT_TORRENT_DONE_ENABLED:
      case Prefs::SCRIPT_TORRENT_DONE_FILENAME:
      case Prefs::START:
      case Prefs::TRASH_ORIGINAL:
      case Prefs::USPEED:
      case Prefs::USPEED_ENABLED:
      case Prefs::UTP_ENABLED:
        sessionSet (myPrefs.getKey (key), myPrefs.variant (key));
        break;

      case Prefs::DOWNLOAD_DIR:
        sessionSet (myPrefs.getKey (key), myPrefs.variant (key));
        /* this will change the 'freespace' argument, so refresh */
        refreshSessionInfo ();
        break;

      case Prefs::RATIO:
        sessionSet (TR_KEY_seedRatioLimit, myPrefs.variant (key));
        break;
      case Prefs::RATIO_ENABLED:
        sessionSet (TR_KEY_seedRatioLimited, myPrefs.variant (key));
        break;

      case Prefs::ENCRYPTION:
        {
          const int i = myPrefs.variant (key).toInt ();
          switch (i)
            {
              case 0:
                sessionSet (myPrefs.getKey (key), QLatin1String ("tolerated"));
                break;
              case 1:
                sessionSet (myPrefs.getKey (key), QLatin1String ("preferred"));
                break;
              case 2:
                sessionSet (myPrefs.getKey (key), QLatin1String ("required"));
                break;
            }
          break;
        }

      case Prefs::RPC_AUTH_REQUIRED:
        if (mySession)
          tr_sessionSetRPCPasswordEnabled (mySession, myPrefs.getBool (key));
        break;

      case Prefs::RPC_ENABLED:
        if (mySession)
          tr_sessionSetRPCEnabled (mySession, myPrefs.getBool (key));
        break;

      case Prefs::RPC_PASSWORD:
        if (mySession)
          tr_sessionSetRPCPassword (mySession, myPrefs.getString (key).toUtf8 ().constData ());
        break;

      case Prefs::RPC_PORT:
        if (mySession)
          tr_sessionSetRPCPort (mySession, myPrefs.getInt (key));
        break;

      case Prefs::RPC_USERNAME:
        if (mySession)
          tr_sessionSetRPCUsername (mySession, myPrefs.getString (key).toUtf8 ().constData ());
        break;

      case Prefs::RPC_WHITELIST_ENABLED:
        if (mySession)
          tr_sessionSetRPCWhitelistEnabled (mySession, myPrefs.getBool (key));
        break;

      case Prefs::RPC_WHITELIST:
        if (mySession)
          tr_sessionSetRPCWhitelist (mySession, myPrefs.getString (key).toUtf8 ().constData ());
        break;

      default:
        std::cerr << "unhandled pref: " << key << std::endl;
    }
}

/***
****
***/

Session::Session (const QString& configDir, Prefs& prefs):
  myConfigDir (configDir),
  myPrefs (prefs),
  myBlocklistSize (-1),
  mySession (0),
  myIsDefinitelyLocalSession (true)
{
  myStats.ratio = TR_RATIO_NA;
  myStats.uploadedBytes = 0;
  myStats.downloadedBytes = 0;
  myStats.filesAdded = 0;
  myStats.sessionCount = 0;
  myStats.secondsActive = 0;
  myCumulativeStats = myStats;

  connect (&myPrefs, SIGNAL (changed (int)), this, SLOT (updatePref (int)));
  connect (&myRpc, SIGNAL (httpAuthenticationRequired ()), this, SIGNAL (httpAuthenticationRequired ()));
  connect (&myRpc, SIGNAL (dataReadProgress ()), this, SIGNAL (dataReadProgress ()));
  connect (&myRpc, SIGNAL (dataSendProgress ()), this, SIGNAL (dataSendProgress ()));
  connect (&myRpc, SIGNAL (networkResponse (QNetworkReply::NetworkError, QString)), this, SIGNAL (networkResponse (QNetworkReply::NetworkError, QString)));
}

Session::~Session ()
{
    stop ();
}

/***
****
***/

void
Session::stop ()
{
  myRpc.stop ();

  if (mySession)
    {
      tr_sessionClose (mySession);
      mySession = 0;
    }
}

void
Session::restart ()
{
  stop ();
  start ();
}

void
Session::start ()
{
  if (myPrefs.get<bool> (Prefs::SESSION_IS_REMOTE))
    {
      QUrl url;
      url.setScheme (QLatin1String ("http"));
      url.setHost (myPrefs.get<QString> (Prefs::SESSION_REMOTE_HOST));
      url.setPort (myPrefs.get<int> (Prefs::SESSION_REMOTE_PORT));
      url.setPath (QLatin1String ("/transmission/rpc"));
      if (myPrefs.get<bool> (Prefs::SESSION_REMOTE_AUTH))
        {
          url.setUserName (myPrefs.get<QString> (Prefs::SESSION_REMOTE_USERNAME));
          url.setPassword (myPrefs.get<QString> (Prefs::SESSION_REMOTE_PASSWORD));
        }

      myRpc.start (url);
    }
  else
    {
      tr_variant settings;
      tr_variantInitDict (&settings, 0);
      tr_sessionLoadSettings (&settings, myConfigDir.toUtf8 ().constData (), "qt");
      mySession = tr_sessionInit (myConfigDir.toUtf8 ().constData (), true, &settings);
      tr_variantFree (&settings);

      myRpc.start (mySession);

      tr_ctor * ctor = tr_ctorNew (mySession);
      int torrentCount;
      tr_torrent ** torrents = tr_sessionLoadTorrents (mySession, ctor, &torrentCount);
      tr_free (torrents);
      tr_ctorFree (ctor);
    }

  emit sourceChanged ();
}

bool
Session::isServer () const
{
  return mySession != 0;
}

bool
Session::isLocal () const
{
  if (!mySessionId.isEmpty ())
    return myIsDefinitelyLocalSession;
  return myRpc.isLocal ();
}

/***
****
***/

namespace
{
  void
  addOptionalIds (tr_variant * args, const QSet<int>& ids)
  {
    if (&ids == &recentlyActiveIds)
      {
        tr_variantDictAddStr (args, TR_KEY_ids, "recently-active");
      }
    else if (!ids.isEmpty ())
      {
        tr_variant * idList (tr_variantDictAddList (args, TR_KEY_ids, ids.size ()));
        for (const int i: ids)
          tr_variantListAddInt (idList, i);
      }
  }
}

void
Session::torrentSet (const QSet<int>& ids, const tr_quark key, double value)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  tr_variantDictAddReal (&args, key, value);
  addOptionalIds (&args, ids);

  exec (TR_KEY_torrent_set, &args);
}

void
Session::torrentSet (const QSet<int>& ids, const tr_quark key, int value)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  tr_variantDictAddInt (&args, key, value);
  addOptionalIds (&args, ids);

  exec (TR_KEY_torrent_set, &args);
}

void
Session::torrentSet (const QSet<int>& ids, const tr_quark key, bool value)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  tr_variantDictAddBool (&args, key, value);
  addOptionalIds (&args, ids);

  exec (TR_KEY_torrent_set, &args);
}

void
Session::torrentSet (const QSet<int>& ids, const tr_quark key, const QStringList& value)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  addOptionalIds (&args, ids);
  tr_variant * list (tr_variantDictAddList (&args, key, value.size ()));
  for (const QString& str: value)
    tr_variantListAddStr (list, str.toUtf8 ().constData ());

  exec (TR_KEY_torrent_set, &args);
}

void
Session::torrentSet (const QSet<int>& ids, const tr_quark key, const QList<int>& value)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  addOptionalIds (&args, ids);
  tr_variant * list (tr_variantDictAddList (&args, key, value.size ()));
  for (const int i: value)
    tr_variantListAddInt (list, i);

  exec (TR_KEY_torrent_set, &args);
}

void
Session::torrentSet (const QSet<int>& ids, const tr_quark key, const QPair<int,QString>& value)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  addOptionalIds (&args, ids);
  tr_variant * list (tr_variantDictAddList (&args, key, 2));
  tr_variantListAddInt (list, value.first);
  tr_variantListAddStr (list, value.second.toUtf8 ().constData ());

  exec (TR_KEY_torrent_set, &args);
}

void
Session::torrentSetLocation (const QSet<int>& ids, const QString& location, bool doMove)
{
  tr_variant args;
  tr_variantInitDict (&args, 3);
  addOptionalIds (&args, ids);
  tr_variantDictAddStr (&args, TR_KEY_location, location.toUtf8 ().constData ());
  tr_variantDictAddBool (&args, TR_KEY_move, doMove);

  exec (TR_KEY_torrent_set_location, &args);
}

void
Session::torrentRenamePath (const QSet<int>& ids, const QString& oldpath, const QString& newname)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  addOptionalIds (&args, ids);
  tr_variantDictAddStr (&args, TR_KEY_path, oldpath.toUtf8 ().constData ());
  tr_variantDictAddStr (&args, TR_KEY_name, newname.toUtf8 ().constData ());

  RpcQueue * q = new RpcQueue ();

  q->add (
    [this, &args] ()
    {
      return exec ("torrent-rename-path", &args);
    },
    [this] (const RpcResponse& r)
    {
      const char * path = "(unknown)";
      const char * name = "(unknown)";
      tr_variantDictFindStr (r.args.get (), TR_KEY_path, &path, nullptr);
      tr_variantDictFindStr (r.args.get (), TR_KEY_name, &name, nullptr);

      QMessageBox * d = new QMessageBox (QMessageBox::Information,
                                         tr ("Error Renaming Path"),
                                         tr ("<p><b>Unable to rename \"%1\" as \"%2\": %3.</b></p> "
                                             "<p>Please correct the errors and try again.</p>")
                                           .arg (QString::fromUtf8 (path))
                                           .arg (QString::fromUtf8 (name))
                                           .arg (r.result),
                                         QMessageBox::Close,
                                         qApp->activeWindow ());
      connect (d, SIGNAL (rejected ()), d, SLOT (deleteLater ()));
      d->show ();
    });

  q->add (
    [this] (const RpcResponse& r)
    {
      int64_t id = 0;

      if (tr_variantDictFindInt (r.args.get (), TR_KEY_id, &id)
          && id != 0)
        refreshTorrents (QSet<int> () << id,
                         KeyList () << TR_KEY_fileStats << TR_KEY_files << TR_KEY_id << TR_KEY_name);
    });

  q->run ();
}

void
Session::refreshTorrents (const QSet<int>& ids, const KeyList& keys)
{
  tr_variant args;
  tr_variantInitDict (&args, 2);
  addList (tr_variantDictAddList (&args, TR_KEY_fields, 0), keys);
  addOptionalIds (&args, ids);

  RpcQueue * q = new RpcQueue ();

  q->add (
    [this, &args] ()
    {
      return exec (TR_KEY_torrent_get, &args);
    });

  const bool allTorrents = ids.empty ();
  q->add (
    [this, allTorrents] (const RpcResponse& r)
    {
      tr_variant * torrents;
      if (tr_variantDictFindList (r.args.get (), TR_KEY_torrents, &torrents))
        emit torrentsUpdated (torrents, allTorrents);
      if (tr_variantDictFindList (r.args.get (), TR_KEY_removed, &torrents))
        emit torrentsRemoved (torrents);
    });

  q->run ();
}

void
Session::refreshExtraStats (const QSet<int>& ids)
{
  refreshTorrents (ids, getStatKeys () + getExtraStatKeys ());
}

void
Session::sendTorrentRequest (const char * request, const QSet<int>& ids)
{
  tr_variant args;
  tr_variantInitDict (&args, 1);
  addOptionalIds (&args, ids);

  RpcQueue * q = new RpcQueue ();

  q->add (
    [this, request, &args] ()
    {
      return exec (request, &args);
    });

  q->add (
    [this, ids] ()
    {
      refreshTorrents (ids, getStatKeys ());
    });

  q->run ();
}

void Session::pauseTorrents    (const QSet<int>& ids) { sendTorrentRequest ("torrent-stop",      ids); }
void Session::startTorrents    (const QSet<int>& ids) { sendTorrentRequest ("torrent-start",     ids); }
void Session::startTorrentsNow (const QSet<int>& ids) { sendTorrentRequest ("torrent-start-now", ids); }
void Session::queueMoveTop     (const QSet<int>& ids) { sendTorrentRequest ("queue-move-top",    ids); }
void Session::queueMoveUp      (const QSet<int>& ids) { sendTorrentRequest ("queue-move-up",     ids); }
void Session::queueMoveDown    (const QSet<int>& ids) { sendTorrentRequest ("queue-move-down",   ids); }
void Session::queueMoveBottom  (const QSet<int>& ids) { sendTorrentRequest ("queue-move-bottom", ids); }

void
Session::refreshActiveTorrents ()
{
  refreshTorrents (recentlyActiveIds, getStatKeys ());
}

void
Session::refreshAllTorrents ()
{
  refreshTorrents (allIds, getStatKeys ());
}

void
Session::initTorrents (const QSet<int>& ids)
{
  refreshTorrents (ids, getStatKeys () + getInfoKeys ());
}

void
Session::refreshSessionStats ()
{
  RpcQueue * q = new RpcQueue ();

  q->add (
    [this] ()
    {
      return exec ("session-stats", nullptr);
    });

  q->add (
    [this] (const RpcResponse& r)
    {
      updateStats (r.args.get ());
    });

  q->run ();
}

void
Session::refreshSessionInfo ()
{
  RpcQueue * q = new RpcQueue ();

  q->add (
    [this] ()
    {
      return exec ("session-get", nullptr);
    });

  q->add (
    [this] (const RpcResponse& r)
    {
      updateInfo (r.args.get ());
    });

  q->run ();
}

void
Session::updateBlocklist ()
{
  RpcQueue * q = new RpcQueue ();

  q->add (
    [this] ()
    {
      return exec ("blocklist-update", nullptr);
    });

  q->add (
    [this] (const RpcResponse& r)
    {
      int64_t blocklistSize;
      if (tr_variantDictFindInt (r.args.get (), TR_KEY_blocklist_size, &blocklistSize))
        setBlocklistSize (blocklistSize);
    });

  q->run ();
}

/***
****
***/

RpcResponseFuture
Session::exec (tr_quark method, tr_variant * args)
{
  return myRpc.exec (method, args);
}

RpcResponseFuture
Session::exec (const char * method, tr_variant * args)
{
  return myRpc.exec (method, args);
}

void
Session::updateStats (tr_variant * d, tr_session_stats * stats)
{
  int64_t i;

  if (tr_variantDictFindInt (d, TR_KEY_uploadedBytes, &i))
    stats->uploadedBytes = i;
  if (tr_variantDictFindInt (d, TR_KEY_downloadedBytes, &i))
    stats->downloadedBytes = i;
  if (tr_variantDictFindInt (d, TR_KEY_filesAdded, &i))
    stats->filesAdded = i;
  if (tr_variantDictFindInt (d, TR_KEY_sessionCount, &i))
    stats->sessionCount = i;
  if (tr_variantDictFindInt (d, TR_KEY_secondsActive, &i))
    stats->secondsActive = i;

  stats->ratio = tr_getRatio (stats->uploadedBytes, stats->downloadedBytes);
}

void
Session::updateStats (tr_variant * d)
{
  tr_variant * c;

  if (tr_variantDictFindDict (d, TR_KEY_current_stats, &c))
    updateStats (c, &myStats);

  if (tr_variantDictFindDict (d, TR_KEY_cumulative_stats, &c))
    updateStats (c, &myCumulativeStats);

  emit statsUpdated ();
}

void
Session::updateInfo (tr_variant * d)
{
  int64_t i;
  const char * str;

  disconnect (&myPrefs, SIGNAL (changed (int)), this, SLOT (updatePref (int)));

  for (int i=Prefs::FIRST_CORE_PREF; i<=Prefs::LAST_CORE_PREF; ++i)
    {
      const tr_variant * b (tr_variantDictFind (d, myPrefs.getKey (i)));

      if (!b)
        continue;

      if (i == Prefs::ENCRYPTION)
        {
          const char * val;
          if (tr_variantGetStr (b, &val, NULL))
            {
              if (qstrcmp (val , "required") == 0)
                myPrefs.set (i, 2);
              else if (qstrcmp (val , "preferred") == 0)
                myPrefs.set (i, 1);
              else if (qstrcmp (val , "tolerated") == 0)
                myPrefs.set (i, 0);
            }
          continue;
        }

      switch (myPrefs.type (i))
        {
          case QVariant::Int:
            {
              int64_t val;
              if (tr_variantGetInt (b, &val))
                myPrefs.set (i, static_cast<int>(val));
              break;
            }
          case QVariant::Double:
            {
              double val;
              if (tr_variantGetReal (b, &val))
                myPrefs.set (i, val);
              break;
            }
          case QVariant::Bool:
            {
              bool val;
              if (tr_variantGetBool (b, &val))
                myPrefs.set (i, val);
              break;
            }
          case CustomVariantType::FilterModeType:
          case CustomVariantType::SortModeType:
          case QVariant::String:
            {
              const char * val;
              if (tr_variantGetStr (b, &val, NULL))
                myPrefs.set (i, QString::fromUtf8 (val));
              break;
            }
          default:
            break;
        }
    }

  bool b;
  double x;
  if (tr_variantDictFindBool (d, TR_KEY_seedRatioLimited, &b))
    myPrefs.set (Prefs::RATIO_ENABLED, b);
  if (tr_variantDictFindReal (d, TR_KEY_seedRatioLimit, &x))
    myPrefs.set (Prefs::RATIO, x);

  /* Use the C API to get settings that, for security reasons, aren't supported by RPC */
  if (mySession != 0)
    {
      myPrefs.set (Prefs::RPC_ENABLED,           tr_sessionIsRPCEnabled (mySession));
      myPrefs.set (Prefs::RPC_AUTH_REQUIRED,     tr_sessionIsRPCPasswordEnabled (mySession));
      myPrefs.set (Prefs::RPC_PASSWORD,          QString::fromUtf8 (tr_sessionGetRPCPassword (mySession)));
      myPrefs.set (Prefs::RPC_PORT,              tr_sessionGetRPCPort (mySession));
      myPrefs.set (Prefs::RPC_USERNAME,          QString::fromUtf8 (tr_sessionGetRPCUsername (mySession)));
      myPrefs.set (Prefs::RPC_WHITELIST_ENABLED, tr_sessionGetRPCWhitelistEnabled (mySession));
      myPrefs.set (Prefs::RPC_WHITELIST,         QString::fromUtf8 (tr_sessionGetRPCWhitelist (mySession)));
    }

  if (tr_variantDictFindInt (d, TR_KEY_blocklist_size, &i) && i!=blocklistSize ())
    setBlocklistSize (i);

  if (tr_variantDictFindStr (d, TR_KEY_version, &str, NULL) && (mySessionVersion != QString::fromUtf8 (str)))
    mySessionVersion = QString::fromUtf8 (str);

  if (tr_variantDictFindStr (d, TR_KEY_session_id, &str, NULL))
    {
      const QString sessionId = QString::fromUtf8 (str);
      if (mySessionId != sessionId)
        {
          mySessionId = sessionId;
          myIsDefinitelyLocalSession = tr_session_id_is_local (str);
        }
    }
  else
    {
      mySessionId.clear ();
    }

  //std::cerr << "Session::updateInfo end" << std::endl;
  connect (&myPrefs, SIGNAL (changed (int)), this, SLOT (updatePref (int)));

  emit sessionUpdated ();
}

void
Session::setBlocklistSize (int64_t i)
{
  myBlocklistSize = i;

  emit blocklistUpdated (i);
}

void
Session::addTorrent (const AddData& addMe, tr_variant * args, bool trashOriginal)
{
  assert (tr_variantDictFind (args, TR_KEY_filename) == nullptr);
  assert (tr_variantDictFind (args, TR_KEY_metainfo) == nullptr);

  if (tr_variantDictFind (args, TR_KEY_paused) == nullptr)
    tr_variantDictAddBool (args, TR_KEY_paused, !myPrefs.getBool (Prefs::START));

  switch (addMe.type)
    {
      case AddData::MAGNET:
        tr_variantDictAddStr (args, TR_KEY_filename, addMe.magnet.toUtf8 ().constData ());
        break;

      case AddData::URL:
        tr_variantDictAddStr (args, TR_KEY_filename, addMe.url.toString ().toUtf8 ().constData ());
        break;

      case AddData::FILENAME: /* fall-through */
      case AddData::METAINFO:
        {
          const QByteArray b64 = addMe.toBase64 ();
          tr_variantDictAddRaw (args, TR_KEY_metainfo, b64.constData (), b64.size ());
          break;
        }

      default:
        qWarning() << "Unhandled AddData type: " << addMe.type;
        break;
    }

  RpcQueue * q = new RpcQueue ();

  q->add (
    [this, args] ()
    {
      return exec ("torrent-add", args);
    },
    [this, addMe] (const RpcResponse& r)
    {
      QMessageBox * d = new QMessageBox (QMessageBox::Warning,
                                         tr ("Error Adding Torrent"),
                                         QString::fromLatin1 ("<p><b>%1</b></p><p>%2</p>")
                                           .arg (r.result)
                                           .arg (addMe.readableName ()),
                                         QMessageBox::Close,
                                         qApp->activeWindow ());
      connect (d, SIGNAL (rejected ()), d, SLOT (deleteLater ()));
      d->show ();
    });

  q->add (
    [this, addMe] (const RpcResponse& r)
    {
      tr_variant * dup;
      const char * str;

      if (tr_variantDictFindDict (r.args.get (), TR_KEY_torrent_duplicate, &dup) &&
          tr_variantDictFindStr (dup, TR_KEY_name, &str, NULL))
        {
          const QString name = QString::fromUtf8 (str);
          QMessageBox * d = new QMessageBox (QMessageBox::Warning,
                                             tr ("Add Torrent"),
                                             tr ("<p><b>Unable to add \"%1\".</b></p>"
                                                 "<p>It is a duplicate of \"%2\" which is already added.</p>")
                                               .arg (addMe.readableShortName ())
                                               .arg (name),
                                             QMessageBox::Close,
                                             qApp->activeWindow ());
          connect (d, SIGNAL (rejected ()), d, SLOT (deleteLater ()));
          d->show ();
        }
    });

  if (trashOriginal && addMe.type == AddData::FILENAME)
    q->add (
      [this, addMe] ()
      {
        QFile original (addMe.filename);
        original.setPermissions (QFile::ReadOwner | QFile::WriteOwner);
        original.remove ();
      });

  q->run ();
}

void
Session::addTorrent (const AddData& addMe)
{
  tr_variant args;
  tr_variantInitDict (&args, 3);

  addTorrent (addMe, &args, myPrefs.getBool (Prefs::TRASH_ORIGINAL));
}

void
Session::addNewlyCreatedTorrent (const QString& filename, const QString& localPath)
{
  const QByteArray b64 = AddData (filename).toBase64 ();

  tr_variant args;
  tr_variantInitDict (&args, 3);
  tr_variantDictAddStr (&args, TR_KEY_download_dir, localPath.toUtf8 ().constData ());
  tr_variantDictAddBool (&args, TR_KEY_paused, !myPrefs.getBool (Prefs::START));
  tr_variantDictAddRaw (&args, TR_KEY_metainfo, b64.constData (), b64.size ());

  exec ("torrent-add", &args);
}

void
Session::removeTorrents (const QSet<int>& ids, bool deleteFiles)
{
  if (!ids.isEmpty ())
    {
      tr_variant args;
      tr_variantInitDict (&args, 2);
      addOptionalIds (&args, ids);
      tr_variantDictAddInt (&args, TR_KEY_delete_local_data, deleteFiles);

      exec ("torrent-remove", &args);
    }
}

void
Session::verifyTorrents (const QSet<int>& ids)
{
  if (!ids.isEmpty ())
    {
      tr_variant args;
      tr_variantInitDict (&args, 1);
      addOptionalIds (&args, ids);

      exec ("torrent-verify", &args);
    }
}

void
Session::reannounceTorrents (const QSet<int>& ids)
{
  if (!ids.isEmpty ())
    {
      tr_variant args;
      tr_variantInitDict (&args, 1);
      addOptionalIds (&args, ids);

      exec ("torrent-reannounce", &args);
    }
}

/***
****
***/

void
Session::launchWebInterface ()
{
  QUrl url;

  if (!mySession) // remote session
    {
      url = myRpc.url ();
      url.setPath (QLatin1String ("/transmission/web/"));
    }
  else // local session
    {
      url.setScheme (QLatin1String ("http"));
      url.setHost (QLatin1String ("localhost"));
      url.setPort (myPrefs.getInt (Prefs::RPC_PORT));
    }

  QDesktopServices::openUrl (url);
}