/**
  * Send / Receive telegrams to/from Hla
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Christian Ehrlicher, SLSE, 2016-09-26
  */

#include "hla_dispatcher.h"
#include "hla_handler_rx.h"
#include "hla_handler_tx.h"

#include <QSettings>
#include <QWebSocket>
#include <QTimer>
#include <nglsettings/nglsettings_settings.h>

namespace HlaJson
{
HlaDispatcher::HlaDispatcher(TrainingAreaBase::Plugin::DataProvider *pdp,
                             const std::shared_ptr<TrainingAreaBase::RecvFromTab> &recvFromTabCb,
                             NGL::Settings *settings)
  : m_recvFromTabCb(recvFromTabCb)
  , m_recvFromHla(std::make_shared<HlaHandlerRx>(recvFromTabCb, this))
  , m_sendToHla(std::make_shared<HlaHandlerTx>(pdp))
  , m_settings(settings)
  , m_webSocket(new QWebSocket(QString(), QWebSocketProtocol::VersionLatest, this))
  , m_webSocketReconnectTimer(new QTimer(this))
  , m_bWarnedOnce(false)
  , m_logger(getLogger("HlaDispatcher"))
{
  connect(m_webSocket, QOverload<QAbstractSocket::SocketError>::of(&QWebSocket::error),
          this, &HlaDispatcher::onWebSocketError);
  connect(m_webSocket, &QWebSocket::connected,
          this, &HlaDispatcher::onHlaConnected);
  connect(m_webSocket, &QWebSocket::disconnected,
          this, &HlaDispatcher::onHlaDisconnected);
  connect(m_webSocket, &QWebSocket::textMessageReceived,
          this, &HlaDispatcher::onTextMessageReceived);
  connect(m_webSocketReconnectTimer, &QTimer::timeout,
          this, &HlaDispatcher::init);
  connect(m_recvFromHla.get(), &HlaHandlerRx::participantConnectionState,
          m_sendToHla.get(), &HlaHandlerTx::onParticipantConnectionState);
}

bool HlaDispatcher::init()
{
  // TODO
  const QUrl url(webSocketUrl());
  if (!m_bWarnedOnce)
    NOTICE_LOG(m_logger) << "Using WebSocket url: " << url.toString();
  m_webSocket->open(url);
  return true;
}

std::shared_ptr<TrainingAreaBase::SendToTab> HlaDispatcher::sendToTab()
{
  return std::static_pointer_cast<TrainingAreaBase::SendToTab>(m_sendToHla);
}

bool HlaDispatcher::canSendData() const
{
  return m_webSocket && m_webSocket->state() == QAbstractSocket::ConnectedState;
}

void HlaDispatcher::onHlaConnected()
{
  QWebSocket *ws = qobject_cast<QWebSocket *>(sender());
  m_sendToHla->onHlaConnected(ws);
  m_webSocketReconnectTimer->stop();
  m_bWarnedOnce = false;
}

void HlaDispatcher::onHlaDisconnected()
{
  INFO_LOG(m_logger) << "Hla socket disconnected";
  m_webSocketReconnectTimer->start(5000);
  m_sendToHla->onHlaDisconnected();

  emit connectionState(QString::fromUtf8(name()), false);
}

void HlaDispatcher::onHlaExternalConnectionStateChanged(bool bConnected)
{
  m_sendToHla->onHlaConnectedToExternalSystem(bConnected);
  emit connectionState(QString::fromUtf8(name()), bConnected);
}

void HlaDispatcher::onWebSocketError()
{
  if (!m_webSocket)
    return;
  if (!m_bWarnedOnce)
    WARNING_LOG(m_logger) << "Error connecting to " << webSocketUrl().toString() << ": " << m_webSocket->errorString();
  m_webSocket->close();
  m_webSocketReconnectTimer->start(5000);
  m_bWarnedOnce = true;

  emit connectionState(QString::fromUtf8(name()), false);
}

void HlaDispatcher::onTextMessageReceived(const QString &message)
{
  // convert from json to internal representation, send to TAB
  m_recvFromHla->handleTelegram(message.toUtf8());
}

QUrl HlaDispatcher::webSocketUrl() const
{
  const quint16 port = m_settings->settings()->value(QStringLiteral("hla/webSocketListenPort"), 12347).toInt();
  const QString addr = m_settings->settings()->value(QStringLiteral("hla/webSocketHostname"), QStringLiteral("localhost")).toString();
  return QUrl(QStringLiteral("ws://%1:%2/").arg(addr).arg(port));
}
} // namespace HlaJson