/*
GNU General Public License version 3 notice

Copyright (C) 2012 Mihawk <luiz@netdome.biz>. All rights reserved.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program 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 "ServerQuery.h"
#include <QUdpSocket>
#include <QHostInfo>
#include <QStringList>
#include <QRegExp>
#include <QTime>
#include <QTimer>

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
ServerQuery::ServerQuery(QObject *parent) :
  QObject(parent),
  mySocket(new QUdpSocket(this)),
  myPort(27500),
  myActiveFlag(false),
  myCurrentPingIndex(0)
{
  connect(mySocket, SIGNAL(error(QAbstractSocket::SocketError)), SLOT(socketError(QAbstractSocket::SocketError)));
  connect(mySocket, SIGNAL(readyRead()), SLOT(parseServerInfo()));
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
ServerQuery::~ServerQuery()
{
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool ServerQuery::query()
{
  myActiveFlag = true;

  if(myAddress.isNull() || !myPort)
  {
    emit error(HostLookupError);
    myActiveFlag = false;
    return false;
  }

  if(mySocket->isOpen())
    mySocket->close();

  mySocket->connectToHost(myAddress, myPort);
  if(!mySocket->waitForConnected(100))
  {
    emit error(ConnectionError);
    myActiveFlag = false;
    return false;
  }

  if(mySocket->write("\xff\xff\xff\xffstatus 23\n", 14) == -1)
  {
    emit error(SendError);
    myActiveFlag = false;
    return false;
  }
  myPingTime.restart();
  return true;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
const QHostAddress &ServerQuery::address() const
{
  return myAddress;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
quint16 ServerQuery::port() const
{
  return myPort;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool ServerQuery::setAddress(const QHostAddress &address, quint16 port)
{
  myAddress = address;
  myPort = port;
  return true;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool ServerQuery::setAddress(const QString &address, quint16 port)
{
  QHostInfo hi = QHostInfo::fromName(address);
  if(hi.error() != QHostInfo::NoError)
  {
    emit error(HostLookupError);
    return false;
  }
  myAddress = hi.addresses().at(0);
  myPort = port;

  return true;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void ServerQuery::parseServerInfo()
{
  QByteArray serverData = mySocket->readAll();

//    qDebug() << mySocket->peerAddress() << mySocket->peerPort();
  if(serverData.isEmpty())
  {
    emit error(EmptyResponseError);
    myActiveFlag = false;
    return;
  }

  myPings[myCurrentPingIndex++ & 7] = myPingTime.elapsed();

  if(!serverData.startsWith("\xff\xff\xff\xffn"))
  {
    emit error(InvalidResponseError);
    myActiveFlag = false;
    return;
  }

  /* Parse server rules */
  myRules.clear();
  QString     infoString(serverData.data()+5);
  QStringList splitInfoString = infoString.split("\n", QString::SkipEmptyParts);
  int         i;
  QStringList rules = splitInfoString.at(0).split("\\", QString::SkipEmptyParts);
  if((rules.size() % 2) != 0)
  {
    emit error(InvalidInfoStringError);
    myActiveFlag = false;
    return;
  }

  ServerRule	rule;
  for(i = 0; i < rules.size(); i += 2)
  {
    rule.rule = rules.at(i);
    rule.value = rules.at(i+1);

    /* Proxy detection */
    if(rule.rule == "*QTV")
    {
      myIsProxyFlag = true;
    }
    else if(rule.rule == "*version")
    {
      QString value = rule.value;
      if(value.startsWith("qwfwd", Qt::CaseInsensitive) || value.startsWith("QTV", Qt::CaseInsensitive) || value.startsWith("2.91"))
        myIsProxyFlag = true;
    }

    /* Adjust FPS */
    if(rule.rule == "maxfps" && myPing > 0)
      myPing += rule.value.toUInt() * 12 / 77;

    myRules.append(rule);
  }

  /* Parse player info */
  myPlayers.clear();
  Player	player;
  QRegExp regex("^([-0-9]+)\\s+([-0-9]+)\\s+([-0-9]+)\\s+([-0-9]+)\\s+\"([^\"]*)\"\\s+\"([^\"]*)\"\\s+([0-9]+)\\s+([0-9]+)(?:\\s+\"([^\"]*)\")?$");
  QStringList	playerInfo;
  for(i = 1; i < splitInfoString.size(); i++)
  {
    if(regex.indexIn(splitInfoString.at(i)) == -1)
    {
      emit error(InvalidPlayerInfoError);
      continue;
    }

    playerInfo = regex.capturedTexts();
    player.id = playerInfo.at(1).toInt();
    player.frags = playerInfo.at(2).toInt();
    player.time = playerInfo.at(3).toInt();
    player.ping = playerInfo.at(4).toInt();
    player.name = playerInfo.at(5);
    player.skin = playerInfo.at(6);
    player.topColor = playerInfo.at(7).toInt();
    player.bottomColor = playerInfo.at(8).toInt();
    player.team = playerInfo.at(9);

    if(player.name.startsWith("\\s\\"))
    {
      player.spectator = true;
      player.team = "(spec)";
      player.name = player.name.replace(QRegExp("^\\\\s\\\\"), "");
      if(player.ping < 0)
        player.ping = -player.ping;
    }
    else
    {
      player.spectator = false;
    }
    myPlayers.append(player);
  }
  myActiveFlag = false;

  emit finished();

  return;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool ServerQuery::isActive() const
{
  return myActiveFlag;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void ServerQuery::socketError(QAbstractSocket::SocketError)
{
  emit error(UnknownError);
  myActiveFlag = false;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
int ServerQuery::ping() const
{
  quint16 avgPing = 0;
  quint8  divisor;
  if(!myCurrentPingIndex)
    return 0xffff;

  if(myCurrentPingIndex < 8)
  {
    for(int i = 0; i < myCurrentPingIndex; ++i)
      avgPing += myPings[i];
    divisor = myCurrentPingIndex;
  }
  else
  {
    for(int i = 0; i < 8; ++i)
      avgPing += myPings[i];
    divisor = 8;
  }

  return avgPing / divisor;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
PlayerList ServerQuery::playerList() const
{
  return myPlayers;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
ServerRules ServerQuery::serverRules() const
{
  return myRules;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
QString ServerQuery::serverRuleValue(const QString &ruleName) const
{
  ServerRule r;
  foreach(r, myRules)
  {
    if(r.rule == ruleName)
      return r.value;
  }
  return QString();
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
char ServerQuery::ourReadableCharsTable[256] = {	'.', '_' , '_' , '_' , '_' , '.' , '_' , '_' , '_' , '_' , '\n' , '_' , '\n' , '>' , '.' , '.',
    '[', ']', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', '_', '_', '_'
                                               };
bool ServerQuery::ourReadableCharsTableInitialized = false;

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void ServerQuery::fillReadableCharsTable()
{
  int i;

  for(i = 32; i < 127; i++)
    ourReadableCharsTable[i] = ourReadableCharsTable[128 + i] = i;
  ourReadableCharsTable[127] = ourReadableCharsTable[128 + 127] = '_';

  for(i = 0; i < 32; i++)
    ourReadableCharsTable[128 + i] = ourReadableCharsTable[i];
  ourReadableCharsTable[128] = '_';
  ourReadableCharsTable[10 + 128] = '_';
  ourReadableCharsTable[12 + 128] = '_';

  ourReadableCharsTableInitialized = true;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
QString ServerQuery::convertNameFun(const QString &name)
{
  if(!ourReadableCharsTableInitialized)
    fillReadableCharsTable();

  QString stripped;

  for(int i = 0; i < name.length(); i++)
    stripped.append(QChar(ourReadableCharsTable[(unsigned char)name.at(i).toAscii()] & 127));

  return stripped;
}