/**
  * @RDE_HEADER@
  * VdControl
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Astrid Müller, SGAS, 2018-02-22
  */

#include "vd_control.h"
#include "ivd_comm.h"
#include "ava_types.h"
#include "AvsCommands/simple_command.h"
#include "AvsCommands/vd_set_script.h"
#include "AvsCommands/keep_alive.h"
#include <LtsUtilsCore/scoped_connection.h>
#include <QTimer>
#include <QtGlobal>
#include <boost/optional.hpp>
#include <chrono>

namespace AudioVideoManagement
{

VdControl::VdControl(IVdComm *comm, std::chrono::milliseconds commandTimeout)
  : m_comm(comm)
  , m_queue(commandTimeout)
  , m_logger(getLogger("VdControl"))
{
  Q_ASSERT(comm);

  connect(comm, &IVdComm::connected, this, &VdControl::onConnected);
  connect(comm, &IVdComm::disconnected, this, &VdControl::onDisconnected);
  connect(&m_queue, &AvsCommandQueue::queueEmpty, this, &VdControl::commandQueueEmpty); // signal -> signal
  connect(&m_queue, &AvsCommandQueue::timeout, this, &VdControl::onTimeout);
}

void VdControl::switchContext(int exerciseId)
{
  queue(new VdCommands::SimpleCommand(QLatin1String("SwitchContext"), m_comm, this, [ = ](IVdComm * comm) { comm->switchContext(exerciseId); }));
}

void VdControl::vdSetScript(const QString &scriptName, AvaStreamType typ, int fileSplitting, const QVector<AvaScriptEntry> &streams, const QString &exportedDirBaseName, const QString &absolutePath)
{
  vdSetScript(scriptName, typ, fileSplitting, streams, exportedDirBaseName, absolutePath, new LtsUtils::DummyConnection);
}


void VdControl::vdReleaseScript(const QString &scriptName)
{
  queue(new VdCommands::SimpleCommand(QLatin1String("vdReleaseScript"), m_comm, this, [ = ](IVdComm * comm) { comm->vdReleaseScript(scriptName); }));
}

void VdControl::keepAlive()
{
  queue(new VdCommands::KeepAlive(m_comm, this));
}

void VdControl::onConnected()
{
  m_connected = true;
  DEBUG_LOG(m_logger) << "connected";
}

void VdControl::onDisconnected()
{
  m_connected = false;
  DEBUG_LOG(m_logger) << "disconnected";
  m_queue.flush();
}

void VdControl::onTimeout()
{
  ICommand *cmd = m_queue.currentCommand();
  if (cmd->canTimeout())
  {
    INFO_LOG(m_logger) << "command '" << cmd->debug() << "' failed";
    m_queue.done();
    return;
  }

  ERROR_LOG(m_logger) << "command timed out";
  failed(cmd);
}

void VdControl::vdSetScript(const QString &scriptName, AvaStreamType typ, int fileSplitting, const QVector<AvaScriptEntry> &streams,
                            const QString &exportedDirBaseName, const QString &absolutePath, LtsUtils::IConnection *connection)
{
  queue(new AvaCommands::VdSetScript(m_comm, this, scriptName, typ, fileSplitting, streams, exportedDirBaseName, absolutePath), connection);
}

void VdControl::queue(ICommand *cmd, LtsUtils::IConnection *connection)
{
  Q_ASSERT(cmd);

  std::unique_ptr<ICommand>   cmd_(cmd);
  std::unique_ptr<LtsUtils::IConnection>   connection_(connection);

  if (!m_connected)
  {
    DEBUG_LOG(m_logger) << "not connected -> dropping command";
    return;
  }

  m_queue.queue(std::move(cmd_), std::move(connection_));
}

/**
 * Default fallback for all commands that don't require special action
 * upon completion such as emitting a signal.
 */
void VdControl::done(ICommand *cmd)
{
  Q_ASSERT(cmd == m_queue.currentCommand());
  m_queue.done();
}

void VdControl::done(AvaCommands::VdSetScript *cmd)
{
  Q_ASSERT(cmd == m_queue.currentCommand());

  {
    LtsUtils::ScopedConnection   scopedConn(m_queue.currentConnection());
    emit vdScriptFinished(cmd->getAvDir(), cmd->getStreamType(), cmd->wasSuccessful());
  } // extra small scope as done() deletes the instance scopedConn is operating on
  m_queue.done();
}

void VdControl::failed(ICommand *cmd)
{
  ERROR_LOG(m_logger) << "command '" << cmd->debug() << "' failed";
  Q_ASSERT(cmd == m_queue.currentCommand());
  m_queue.flush();
  m_comm->forceDisconnect();
}

void VdControl::alive(ICommand *cmd)
{
  Q_ASSERT(cmd == m_queue.currentCommand());
  m_queue.alive();
}

} // namespace AudioVideoManagement