#include "egcu_simulator.h"

QVector<int> relayStates = {0,0,0,0,0,0,0,0};

QByteArray createHttpResponse(int statusCode, const QString &contentType, const QString &body)
{
  QString statusText;
  switch (statusCode)
  {
  case 200: statusText = QStringLiteral("OK"); break;
  case 404: statusText = QStringLiteral("Not Found"); break;
  case 405: statusText = QStringLiteral("Method Not Allowed"); break;
  default: statusText = QStringLiteral("Error"); break;
  }

  QString response;
  response.append(QString(QStringLiteral("HTTP/1.1 %1 %2\r\n")).arg(statusCode).arg(statusText));
  response.append(QString(QStringLiteral("Content-Type: %1\r\n")).arg(contentType));
  response.append(QString(QStringLiteral("Content-Length: %1\r\n")).arg(body.toUtf8().size()));
  response.append(QString(QStringLiteral("Connection: close\r\n\r\n")));
  QByteArray responseBa = response.toUtf8();
  responseBa.append(body.toUtf8());
  return responseBa;
}

QString sendState()
{
  int i = 0;
  QString stateString;
  for (int value : qAsConst(relayStates))
  {
    QString state = QStringLiteral("\"");
    state += QString::number(i);

    if (value == 0)
      state +=QStringLiteral("\":\"off\",");
    else
      state +=QStringLiteral("\":\"on\",");
    i++;

    stateString += state;
  }

  stateString.chop(1);

  //return createHttpResponse(200, "text/html", "{\"ID\":\"0x520\",\"Name\":\"Relay Report\",\"State\":{\"0\":\"on\",\"1\":\"off\",\"2\":\"off\",\"3\":\"off\",\"4\":\"off\",\"5\":\"off\",\"6\":\"off\",\"7\":\"off\"}}");
  QString resultString = QStringLiteral("{\"ID\":\"0x520\",\"Name\":\"Relay Report\",\"State\":{");
  resultString += stateString;
  resultString += QStringLiteral("}}");
  qDebug() << "resultString=" << resultString << "\n";
  return resultString;
}


QByteArray processRequest(const QByteArray &request)
{
  qDebug() << "processRequest:\n" << request;
  QString requestStr = QString::fromUtf8( request);
  // Parsen der HTTP-Request-Zeile
  QStringList lines = requestStr.split(QStringLiteral("\r\n"));
  QStringList requestLine = lines.first().split(QStringLiteral(" "));
  QString method = requestLine.value(0);
  QString path = requestLine.value(1);

  // GET-Anfrage verarbeiten
  if (method == QStringLiteral("GET"))
  {
    qDebug() << "GET path='" << path << "'\n";
    if (path == QStringLiteral("/"))
      return createHttpResponse(200, QStringLiteral("text/html"), QStringLiteral("<h1>EGCU-Simulator</h1>"));
    if (path == QStringLiteral("/relay.php?state=3"))
    {
      return createHttpResponse(200, QStringLiteral("text/html"), sendState());
    }
    else if (path.contains(QStringLiteral("relay.php"))&&path.contains(QStringLiteral("number")))
    {
      // number=0&state=1
      int startNumberStr= path.indexOf(QStringLiteral("number="));
      int startNumber = startNumberStr+7;
      QString numberStr = path.mid(startNumber,1);
      int number = numberStr.toInt();

      int startStateStr= path.indexOf(QStringLiteral("state="));
      int startState = startStateStr+6;
      QString stateStr = path.mid(startState,1);
      int state = stateStr.toInt();

      relayStates[number] = state;

      qDebug() << "Relais wird geschaltet"
               << " number=" << number
               << " state=" << state << " \n";

      return createHttpResponse(200, QStringLiteral("text/html"), sendState());
    }
    else if (path == QStringLiteral("/about"))
      return createHttpResponse(200, QStringLiteral("text/html"),QStringLiteral( "</h1>über uns: Qt Webserver</h1>"));
    else
      return createHttpResponse(404, QStringLiteral("text/html"), QStringLiteral("<h1>404 - Seite nicht gefunden</h1>"));
  }

  // POST-Anfrage verarbeiten        if (method == "POST") {
  QString postData = lines.last(); // POST-Daten befinden sich in der letzten Zeile            qDebug() << "POST-Daten:" << postData;

  QString responseStr = QStringLiteral("{\"status\": \"success\", \"data\": \"");
  responseStr += postData;
  responseStr += QStringLiteral("\"}");

//  return createHttpResponse(200, QStringLiteral("application/json"),
//                            QString("{\"status\": \"success\", \"data\": \"%1\"}").arg(postData));
    return createHttpResponse(200, QStringLiteral("application/json"),responseStr);

}




void SimpleWebServer::incomingConnection(qintptr socketDescriptor)
{
  // Bei neuer Verbindung
  QTcpSocket *clientSocket = new QTcpSocket(this);
  clientSocket->setSocketDescriptor(socketDescriptor);

  connect(clientSocket, &QTcpSocket::readyRead, [clientSocket]()
  {
    // HTTP-Anfrage lesen
    QByteArray request = clientSocket->readAll();
    qDebug() << "Anfrage erhalten:\n" << request;

    // Verarbeite die Anfrage
    QByteArray response = processRequest(request);

    // Antwort senden
    clientSocket->write(response);
    clientSocket->disconnectFromHost();

  });

  connect(clientSocket, &QTcpSocket::disconnected, clientSocket, &QTcpSocket::deleteLater);

  qDebug() << "Neue Verbindung von:" << clientSocket->peerAddress().toString();
}