/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2002 Chris Schoeneman
 *
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 *
 * This package 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, see <http://www.gnu.org/licenses/>.
 */

#include "synergy/ClientApp.h"

#include "arch/Arch.h"
#include "arch/IArchTaskBarReceiver.h"
#include "base/Event.h"
#include "base/EventQueue.h"
#include "base/IEventQueue.h"
#include "base/Log.h"
#include "base/String.h"
#include "base/TMethodEventJob.h"
#include "base/TMethodJob.h"
#include "base/log_outputters.h"
#include "client/Client.h"
#include "common/Version.h"
#include "mt/Thread.h"
#include "net/InverseSockets/InverseSocketFactory.h"
#include "net/NetworkAddress.h"
#include "net/SocketMultiplexer.h"
#include "net/TCPSocketFactory.h"
#include "net/XSocket.h"
#include "synergy/ArgParser.h"
#include "synergy/ClientArgs.h"
#include "synergy/Screen.h"
#include "synergy/XScreen.h"
#include "synergy/protocol_types.h"

#if SYSAPI_WIN32
#include "arch/win32/ArchMiscWindows.h"
#endif

#if WINAPI_MSWINDOWS
#include "platform/MSWindowsScreen.h"
#elif WINAPI_XWINDOWS
#include "platform/XWindowsScreen.h"
#elif WINAPI_CARBON
#include "platform/OSXScreen.h"
#endif

#if defined(__APPLE__)
#include "platform/OSXDragSimulator.h"
#endif

#include <memory>
#include <sstream>
#include <stdio.h>

#define RETRY_TIME 1.0

ClientApp::ClientApp(
    IEventQueue *events, CreateTaskBarReceiverFunc createTaskBarReceiver)
    : App(events, createTaskBarReceiver, new synergy::ClientArgs()),
      m_client(NULL),
      m_clientScreen(NULL),
      m_serverAddress(NULL) {}

ClientApp::~ClientApp() {}

void ClientApp::parseArgs(int argc, const char *const *argv) {
  ArgParser argParser(this);
  bool result = argParser.parseClientArgs(args(), argc, argv);

  if (!result || args().m_shouldExitOk || args().m_shouldExitFail) {
    if (args().m_shouldExitOk) {
      m_bye(kExitSuccess);
    } else {
      m_bye(kExitArgs);
    }
  } else {
    // save server address
    if (!args().m_serverAddress.empty()) {
      try {
        *m_serverAddress = NetworkAddress(args().m_serverAddress, kDefaultPort);
        m_serverAddress->resolve();
      } catch (XSocketAddress &e) {
        // allow an address that we can't look up if we're restartable.
        // we'll try to resolve the address each time we connect to the
        // server.  a bad port will never get better.  patch by Brent
        // Priddy.
        if (!args().m_restartable || e.getError() == XSocketAddress::kBadPort) {
          LOG(
              (CLOG_CRIT "%s: %s" BYE, args().m_pname, e.what(),
               args().m_pname));
          m_bye(kExitFailed);
        }
      }
    }
  }
}

void ClientApp::help() {
#if WINAPI_XWINDOWS
#define WINAPI_ARG " [--display <display>] [--no-xinitthreads]"
#define WINAPI_INFO                                                            \
  "      --display <display>  connect to the X server at <display>\n"          \
  "      --no-xinitthreads    do not call XInitThreads()\n"
#else
#define WINAPI_ARG ""
#define WINAPI_INFO ""
#endif
  std::stringstream help;
  help << "Usage: " << args().m_pname << " [--address <address>]"
       << " [--yscroll <delta>]"
       << " [--sync-language]"
       << " [--invert-scroll]"
       << " [--host]" << WINAPI_ARG << HELP_SYS_ARGS << HELP_COMMON_ARGS
       << " <server-address>"
       << "\n\n"
       << "Connect to a synergy mouse/keyboard sharing server.\n"
       << "\n"
       << "  -a, --address <address>  local network interface address.\n"
       << HELP_COMMON_INFO_1 << WINAPI_INFO << HELP_SYS_INFO
       << "      --yscroll <delta>    defines the vertical scrolling delta, "
          "which is\n"
       << "                             120 by default.\n"
       << "      --sync-language      set this parameter to enable language "
          "synchronization.\n"
       << "      --invert-scroll      invert scroll direction on this "
          "computer.\n"
       << "      --host               client starts a listener and waits for a "
          "server connection.\n"
       << HELP_COMMON_INFO_2 << "\n"
       << "* marks defaults.\n"
       << "\n"
       << "The server address is of the form: [<hostname>][:<port>].  The "
          "hostname\n"
       << "must be the address or hostname of the server.  The port overrides "
          "the\n"
       << "default port, " << kDefaultPort << ".\n";

  LOG((CLOG_PRINT "%s", help.str().c_str()));
}

const char *ClientApp::daemonName() const {
#if SYSAPI_WIN32
  return "Synergy Client";
#elif SYSAPI_UNIX
  return "synergyc";
#endif
}

const char *ClientApp::daemonInfo() const {
#if SYSAPI_WIN32
  return "Allows another computer to share it's keyboard and mouse with this "
         "computer.";
#elif SYSAPI_UNIX
  return "";
#endif
}

synergy::Screen *ClientApp::createScreen() {
#if WINAPI_MSWINDOWS
  return new synergy::Screen(
      new MSWindowsScreen(
          false, args().m_noHooks, args().m_stopOnDeskSwitch, m_events,
          args().m_enableLangSync, args().m_clientScrollDirection),
      m_events);
#elif WINAPI_XWINDOWS
  return new synergy::Screen(
      new XWindowsScreen(
          args().m_display, false, args().m_disableXInitThreads,
          args().m_yscroll, m_events, args().m_clientScrollDirection),
      m_events);
#elif WINAPI_CARBON
  return new synergy::Screen(
      new OSXScreen(
          m_events, false, args().m_enableLangSync,
          args().m_clientScrollDirection),
      m_events);
#endif
}

void ClientApp::updateStatus() { updateStatus(""); }

void ClientApp::updateStatus(const String &msg) {
  if (m_taskBarReceiver) {
    m_taskBarReceiver->updateStatus(m_client, msg);
  }
}

void ClientApp::resetRestartTimeout() {
  // retry time can nolonger be changed
  // s_retryTime = 0.0;
}

double ClientApp::nextRestartTimeout() {
  // retry at a constant rate (Issue 52)
  return RETRY_TIME;

  /*
  // choose next restart timeout.  we start with rapid retries
  // then slow down.
  if (s_retryTime < 1.0) {
  s_retryTime = 1.0;
  }
  else if (s_retryTime < 3.0) {
  s_retryTime = 3.0;
  }
  else {
  s_retryTime = 5.0;
  }
  return s_retryTime;
  */
}

void ClientApp::handleScreenError(const Event &, void *) {
  LOG((CLOG_CRIT "error on screen"));
  m_events->addEvent(Event(Event::kQuit));
}

synergy::Screen *ClientApp::openClientScreen() {
  synergy::Screen *screen = createScreen();
  screen->setEnableDragDrop(argsBase().m_enableDragDrop);
  m_events->adoptHandler(
      m_events->forIScreen().error(), screen->getEventTarget(),
      new TMethodEventJob<ClientApp>(this, &ClientApp::handleScreenError));
  return screen;
}

void ClientApp::closeClientScreen(synergy::Screen *screen) {
  if (screen != NULL) {
    m_events->removeHandler(
        m_events->forIScreen().error(), screen->getEventTarget());
    delete screen;
  }
}

void ClientApp::handleClientRestart(const Event &, void *vtimer) {
  // discard old timer
  EventQueueTimer *timer = static_cast<EventQueueTimer *>(vtimer);
  m_events->deleteTimer(timer);
  m_events->removeHandler(Event::kTimer, timer);

  // reconnect
  startClient();
}

void ClientApp::scheduleClientRestart(double retryTime) {
  // install a timer and handler to retry later
  LOG((CLOG_DEBUG "retry in %.0f seconds", retryTime));
  EventQueueTimer *timer = m_events->newOneShotTimer(retryTime, NULL);
  m_events->adoptHandler(
      Event::kTimer, timer,
      new TMethodEventJob<ClientApp>(
          this, &ClientApp::handleClientRestart, timer));
}

void ClientApp::handleClientConnected(const Event &, void *) {
  LOG((CLOG_NOTE "connected to server"));
  resetRestartTimeout();
  updateStatus();
}

void ClientApp::handleClientFailed(const Event &e, void *) {
  if ((++m_lastServerAddressIndex) <
      m_client->getLastResolvedAddressesCount()) {
    std::unique_ptr<Client::FailInfo> info(
        static_cast<Client::FailInfo *>(e.getData()));

    updateStatus(
        String("Failed to connect to server: ") + info->m_what +
        " Trying next address...");
    LOG(
        (CLOG_NOTE "failed to connect to server=%s, trying next address",
         info->m_what.c_str()));
    if (!m_suspended) {
      scheduleClientRestart(nextRestartTimeout());
    }
  } else {
    m_lastServerAddressIndex = 0;
    handleClientRefused(e, nullptr);
  }
}

void ClientApp::handleClientRefused(const Event &e, void *) {
  std::unique_ptr<Client::FailInfo> info(
      static_cast<Client::FailInfo *>(e.getData()));

  updateStatus(String("Failed to connect to server: ") + info->m_what);
  if (!args().m_restartable || !info->m_retry) {
    LOG((CLOG_ERR "failed to connect to server: %s", info->m_what.c_str()));
    m_events->addEvent(Event(Event::kQuit));
  } else {
    LOG((CLOG_WARN "failed to connect to server: %s", info->m_what.c_str()));
    if (!m_suspended) {
      scheduleClientRestart(nextRestartTimeout());
    }
  }
}

void ClientApp::handleClientDisconnected(const Event &, void *) {
  LOG((CLOG_NOTE "disconnected from server"));
  if (!args().m_restartable) {
    m_events->addEvent(Event(Event::kQuit));
  } else if (!m_suspended) {
    scheduleClientRestart(nextRestartTimeout());
  }
  updateStatus();
}

Client *ClientApp::openClient(
    const String &name, const NetworkAddress &address,
    synergy::Screen *screen) {
  Client *client =
      new Client(m_events, name, address, getSocketFactory(), screen, args());

  try {
    m_events->adoptHandler(
        m_events->forClient().connected(), client->getEventTarget(),
        new TMethodEventJob<ClientApp>(
            this, &ClientApp::handleClientConnected));

    m_events->adoptHandler(
        m_events->forClient().connectionFailed(), client->getEventTarget(),
        new TMethodEventJob<ClientApp>(this, &ClientApp::handleClientFailed));

    m_events->adoptHandler(
        m_events->forClient().connectionRefused(), client->getEventTarget(),
        new TMethodEventJob<ClientApp>(this, &ClientApp::handleClientRefused));

    m_events->adoptHandler(
        m_events->forClient().disconnected(), client->getEventTarget(),
        new TMethodEventJob<ClientApp>(
            this, &ClientApp::handleClientDisconnected));

  } catch (std::bad_alloc &ba) {
    delete client;
    throw ba;
  }

  return client;
}

void ClientApp::closeClient(Client *client) {
  if (client == NULL) {
    return;
  }

  m_events->removeHandler(m_events->forClient().connected(), client);
  m_events->removeHandler(m_events->forClient().connectionFailed(), client);
  m_events->removeHandler(m_events->forClient().connectionRefused(), client);
  m_events->removeHandler(m_events->forClient().disconnected(), client);
  delete client;
}

int ClientApp::foregroundStartup(int argc, char **argv) {
  initApp(argc, argv);

  // never daemonize
  return mainLoop();
}

bool ClientApp::startClient() {
  double retryTime;
  synergy::Screen *clientScreen = NULL;
  try {
    if (m_clientScreen == NULL) {
      clientScreen = openClientScreen();
      m_client = openClient(args().m_name, *m_serverAddress, clientScreen);
      m_clientScreen = clientScreen;
      LOG((CLOG_NOTE "started client"));
    }

    m_client->connect(m_lastServerAddressIndex);

    updateStatus();
    return true;
  } catch (XScreenUnavailable &e) {
    LOG((CLOG_WARN "secondary screen unavailable: %s", e.what()));
    closeClientScreen(clientScreen);
    updateStatus(String("secondary screen unavailable: ") + e.what());
    retryTime = e.getRetryTime();
  } catch (XScreenOpenFailure &e) {
    LOG((CLOG_CRIT "failed to start client: %s", e.what()));
    closeClientScreen(clientScreen);
    return false;
  } catch (XBase &e) {
    LOG((CLOG_CRIT "failed to start client: %s", e.what()));
    closeClientScreen(clientScreen);
    return false;
  }

  if (args().m_restartable) {
    scheduleClientRestart(retryTime);
    return true;
  } else {
    // don't try again
    return false;
  }
}

void ClientApp::stopClient() {
  closeClient(m_client);
  closeClientScreen(m_clientScreen);
  m_client = NULL;
  m_clientScreen = NULL;
}

int ClientApp::mainLoop() {
  // create socket multiplexer.  this must happen after daemonization
  // on unix because threads evaporate across a fork().
  SocketMultiplexer multiplexer;
  setSocketMultiplexer(&multiplexer);

  // start client, etc
  appUtil().startNode();

  // init ipc client after node start, since create a new screen wipes out
  // the event queue (the screen ctors call adoptBuffer).
  if (argsBase().m_enableIpc) {
    initIpcClient();
  }

  // run event loop.  if startClient() failed we're supposed to retry
  // later.  the timer installed by startClient() will take care of
  // that.
  DAEMON_RUNNING(true);

#if defined(MAC_OS_X_VERSION_10_7)

  Thread thread(
      new TMethodJob<ClientApp>(this, &ClientApp::runEventsLoop, NULL));

  // wait until carbon loop is ready
  OSXScreen *screen =
      dynamic_cast<OSXScreen *>(m_clientScreen->getPlatformScreen());
  screen->waitForCarbonLoop();

  runCocoaApp();
#else
  m_events->loop();
#endif

  DAEMON_RUNNING(false);

  // close down
  LOG((CLOG_DEBUG1 "stopping client"));
  stopClient();
  updateStatus();
  LOG((CLOG_NOTE "stopped client"));

  if (argsBase().m_enableIpc) {
    cleanupIpcClient();
  }

  return kExitSuccess;
}

static int daemonMainLoopStatic(int argc, const char **argv) {
  return ClientApp::instance().daemonMainLoop(argc, argv);
}

int ClientApp::standardStartup(int argc, char **argv) {
  initApp(argc, argv);

  // daemonize if requested
  if (args().m_daemon) {
    return ARCH->daemonize(daemonName(), &daemonMainLoopStatic);
  } else {
    return mainLoop();
  }
}

int ClientApp::runInner(
    int argc, char **argv, ILogOutputter *outputter, StartupFunc startup) {
  // general initialization
  m_serverAddress = new NetworkAddress;
  args().m_pname = ARCH->getBasename(argv[0]);

  // install caller's output filter
  if (outputter != NULL) {
    CLOG->insert(outputter);
  }

  int result;
  try {
    // run
    result = startup(argc, argv);
  } catch (...) {
    if (m_taskBarReceiver) {
      // done with task bar receiver
      delete m_taskBarReceiver;
    }

    delete m_serverAddress;

    throw;
  }

  return result;
}

void ClientApp::startNode() {
  // start the client.  if this return false then we've failed and
  // we shouldn't retry.
  LOG((CLOG_DEBUG1 "starting client"));
  if (!startClient()) {
    m_bye(kExitFailed);
  }
}

ISocketFactory *ClientApp::getSocketFactory() const {
  ISocketFactory *socketFactory = nullptr;

  if (args().m_hostMode) {
    socketFactory = new InverseSocketFactory(m_events, getSocketMultiplexer());
  } else {
    socketFactory = new TCPSocketFactory(m_events, getSocketMultiplexer());
  }

  return socketFactory;
}