/**
  * @RDE_HEADER@
  * HTTPRequestHandler sends requests to Axis Cameras initialized in VapixConfig
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Terrell Scharfenberg, SLSE, 2016-05-27
  */

#include "httprequesthandler.h"
#include <QDebug>
#include <QEventLoop>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QRegularExpression>

using namespace VapixConfig;
HTTPRequestHandler::HTTPRequestHandler()
{}

void HTTPRequestHandler::init(const QString &ip, const QString &password, const QString &username)
{
  m_ip = ip;
  m_userName = username;
  m_password = password;
}

QNetworkReply *HTTPRequestHandler::sendRequest(const QUrl &paramUrl, QNetworkAccessManager *qNam)
{
  QNetworkRequest request(paramUrl);
  QNetworkReply *reply = qNam->get(request);
  // TODO
  QEventLoop eventLoop;
  QObject::connect(qNam, &QNetworkAccessManager::finished,
                   &eventLoop, &QEventLoop::quit);
  eventLoop.exec();
  qDebug() << "Request sent";
  return reply;
}
// gets all parameter(configuration) from the camera
QVector<QMap<QString, QString>> HTTPRequestHandler::getParams(const QString &groupName, QNetworkAccessManager *qNam)
{
  int amount = getAmount(groupName, qNam);
  QVector<QMap<QString, QString>> paramList;

  const QString prefix = buildHttpPrefix() + QLatin1String("/axis-cgi/admin/param.cgi?action=list&group=");
  QString baseUrl;
  paramList.reserve(amount);
  for (int i = 0; i < amount; ++i)
  {
    if (groupName == QLatin1String("Event.*.Actions"))
      baseUrl = prefix + QLatin1String("Event.E") + QString::number(i) + QLatin1String(".Actions");
    else if (groupName == QLatin1String("EventServers"))
      baseUrl = prefix + groupName + QLatin1String(".TCP.T") + QString::number(i);
    else if (groupName == QLatin1String("Motion"))
      baseUrl = prefix + groupName + QLatin1String(".M") + QString::number(i);
    else if (groupName == QLatin1String("Event"))
      baseUrl = prefix + groupName + QLatin1String(".E") + QString::number(i);
    else if (groupName == QLatin1String("Image"))
      baseUrl = prefix + groupName + QLatin1String(".I0.Appearance.Resolution");
    else
      qDebug() << "Error: Groupname does not exist";
    QUrl requestUrl(baseUrl);
    QNetworkReply *reply = sendRequest(requestUrl, qNam);
    QByteArray replyBytes = reply->readAll();
    QString replyText = QString::fromUtf8(replyBytes.data(), replyBytes.size());
    QRegularExpression re(QLatin1String("(\\w++=[^_]++)"));
    const QVector<QStringRef> replyList = replyText.splitRef(QRegExp(QLatin1String("\n|\r\n|\r")));
    QMap<QString, QString> paramMap;
    for (const QStringRef &string : replyList)
    {
      QRegularExpressionMatch match = re.match(string, 0, QRegularExpression::PartialPreferCompleteMatch);
      if (!match.captured(0).isNull())
      {
        const QStringList sl = match.captured(0).split(QLatin1Char('='));
        paramMap[sl.at(0)] = sl.at(1);
      }
    }
    reply->deleteLater();
    paramList.append(paramMap);
    paramMap.clear();
  }
  return paramList;
}

//removes all modified parameter
void HTTPRequestHandler::removeParams(const QString &groupName, QNetworkAccessManager *qNam)
{
  const QString prefix = buildHttpPrefix() + QLatin1String("/axis-cgi/admin/param.cgi?action=list&group=");
  QUrl requestUrl(prefix + groupName);
  QNetworkReply *reply = sendRequest(requestUrl, qNam);
  QByteArray replyBytes = reply->readAll();
  QString replyText = QString::fromUtf8(replyBytes.data(), replyBytes.size());
  QRegularExpression re(QLatin1String("(\\b\\w{2}\\b)"));
  const QVector<QStringRef> replyList = replyText.splitRef(QRegExp(QLatin1String("\n|\r\n|\r")));
  QStringList tempList;
  for (const QStringRef &string : replyList)
  {
    QRegularExpressionMatch match = re.match(string, 0, QRegularExpression::NormalMatch);
    if (match.capturedRef(0).isNull())
      continue;

    const QString removeUrl = buildHttpPrefix() + QLatin1String("/axis-cgi/admin/param.cgi?action=remove&group=") +
        groupName + QLatin1Char('.') + match.captured(0);
    tempList.append(removeUrl);
  }
  tempList.removeDuplicates();
  for (const QString &string : qAsConst(tempList))
  {
    QUrl url;
    url.setUrl(string);
    sendRequest(url, qNam);
  }
  reply->deleteLater();
}
//method to get how many parameter are configurated multiple times
int HTTPRequestHandler::getAmount(const QString &groupName, QNetworkAccessManager *qNam)
{
  const QString reqStr = buildHttpPrefix() + QLatin1String("/axis-cgi/admin/param.cgi?action=list&group=");

  QString baseUrl;
  if (groupName == QLatin1String("Event.*.Actions"))
    baseUrl = reqStr + groupName + QLatin1String(".*.Protocol");
  else if (groupName == QLatin1String("EventServers"))
    baseUrl = reqStr + groupName + QLatin1String(".TCP.*.Name");
  else if (groupName == QLatin1String("Image"))
    baseUrl = reqStr + groupName + QLatin1String(".I0.Appearance.Resolution");
  else
    baseUrl = reqStr + groupName + QLatin1String(".*.Name");

  QUrl requestUrl(baseUrl);
  QNetworkReply *reply = sendRequest(requestUrl, qNam);
  QByteArray replyBytes = reply->readAll();
  QString bytesString = QString::fromUtf8(replyBytes.data(), replyBytes.size());
  QString replyText = QVariant(bytesString).toString();
  QStringList replyList = replyText.split(QRegExp(QLatin1String("\n|\r\n|\r")));
  reply->deleteLater();
  return replyList.count() - 1;
}

QString HTTPRequestHandler::buildHttpPrefix() const
{
  QString prefix = QLatin1String("http://");
  if (!m_userName.isEmpty())
    prefix += m_userName + QLatin1Char(':');
  if (!m_password.isEmpty())
    prefix += m_password + QLatin1Char('@');
  prefix += m_ip;
  return prefix;
}