/*
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 "App.h"
#include "Client.h"
#include <QStringList>
#include <QTcpSocket>
#include <QTcpServer>
#include <QRegExp>
#include <QHostInfo>
#include <QTimerEvent>
#include <QDebug>
#include <QtSql/QSqlQuery>
#include <QCryptographicHash>
#include <QHostAddress>
#include <QThread>
#include <QTimer>
#include "SshClient.h"
#include "ActiveClient.h"
#include "Settings.h"

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/**
  Used just to expose the msleep function
  from QThread

  @author  Mihawk <luiz@netdome.biz>
*/
class Sleeper: public QThread
{
public:
  static void msleep(unsigned long msecs)
  {
    QThread::msleep(msecs);
  }
};

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
App::App(int &argc, char **argv) :
  QCoreApplication(argc, argv),
  myServer(new QTcpServer()),
  mySocketConnectedFlag(false),
  mySshClient(new SshClient(this))
{
  if(!parseCommandLine())
  {
    QTimer::singleShot(0, this, SLOT(quit()));
    return;
  }

  print("CMP Bot Service v0.13\n========================================================\n");

  setApplicationName("CMP QWBOT");
  setOrganizationDomain("https://gitlab.netdome.biz/community-messaging-project/qwbot");
  setOrganizationName("CMP");
  setApplicationVersion("0.13");

  myClientsFrameTimerID = startTimer(0);

  loadServerList();

  print("Connecting to central...\n");
  connect(mySshClient, SIGNAL(connected()), SLOT(onCentralConnection()));
  mySshClient->connectToHost(Settings::globalInstance()->sshUserName(), Settings::globalInstance()->sshHostName(), Settings::globalInstance()->sshPort());

  Settings::globalInstance()->save();
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
App::~App()
{
  Settings::globalInstance()->save();
  cleanup();
  delete myServer;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool App::parseCommandLine()
{
  if(arguments().size() < 2)
    return true;

  QStringList args = App::arguments();
  QString arg;
  QStringList::const_iterator itr;
  for(itr = args.constBegin()+1; itr != args.constEnd(); ++itr)
  {
    arg = *itr;
    if(arg == "--help" || arg == "-h")
    {
      printf("Usage: %s [--config/-c config_file] [-h]\n", args.at(0).section("/", -1).toLatin1().data());
      return false;
    }
    else if(arg == "--config" || arg == "-c")
    {
      itr++;
      if(itr == args.constEnd())
      {
        printf("--config: Expected config file path.\n");
        return false;
      }
      arg = *itr;
      printf("Using config file [%s]...\n", arg.toLatin1().data());
      Settings::globalInstance()->changeConfigFile(*itr);
      return true;
    }
  }
  return true;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::loadServerList()
{
  Settings::ServerList list = Settings::globalInstance()->serverList();
  Settings::Server sv;

  foreach(sv, list)
  {
    if(myClients.size() == Settings::globalInstance()->maxServers())
    {
      print("Maximum number of servers allowed reached, some servers weren't added to the monitoring list.\n");
      return;
    }
    addClient(sv.address, sv.port, sv.password);
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::saveServerList()
{
  Settings::ServerList list;
  ActiveClient* ac;

  foreach(ac, myClients)
  {
    Settings::Server sv;
    sv.address = ac->serverHostNameString().split(":").at(0);
    sv.port = ac->serverHostNameString().split(":").at(1).toUShort();
    list.push_back(sv);
  }
  Settings::globalInstance()->setServerList(list);
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
const QStringList& App::lastMessages() const
{
  return myLastMessages;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::print(const QString &msg)
{
  printf("%s", msg.toLatin1().data());
  if(mySocketConnectedFlag)
  {
    mySocket->write(msg.toLatin1());
    mySocket->waitForBytesWritten();
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool App::addClient(const QString &hostName, quint16 port, const QString& password)
{
  QHostInfo hi = QHostInfo::fromName(hostName);
  if (hi.error() != QHostInfo::NoError) {
    print("Couldn't add server " + hostName + ": " + hi.errorString());
    return false;
  }
  QHostAddress hostAddress = hi.addresses().first();
  QString fullAddress = hostAddress.toString() + ":" + QString::number(port);
  ActiveClient* ac;
  foreach(ac, myClients)
  {
    if(ac->serverAddressString() == fullAddress)
    {
      print("That client is already on the list [" + fullAddress + "]\n");
      return false;
    }
  }

  ac = new ActiveClient(this, password, this);
  ac->setAddress(hostName, hostAddress, port);
  ac->client()->setQuakeFolder(Settings::globalInstance()->quakeFolder().toLatin1().data());
  ac->client()->setName(Settings::globalInstance()->botName().toLatin1().data());
  ac->client()->setSpectator(Settings::globalInstance()->botSpectator());
  ac->client()->setPing(Settings::globalInstance()->botPing());
  ac->client()->setColor(Settings::globalInstance()->botTopColor(), Settings::globalInstance()->botBottomColor());
  myClients.push_back(ac);

  saveServerList();

  print("Client added to watch list [" + fullAddress + "]\n");

  return true;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
bool App::removeClient(const QString &hostName, quint16 port)
{
  QHostInfo hi = QHostInfo::fromName(hostName);
  if (hi.error() != QHostInfo::NoError) {
    print("Couldn't add server " + hostName + ": " + hi.errorString());
    return false;
  }
  QHostAddress hostAddress = hi.addresses().first();
  QString fullAddress = hostAddress.toString() + ":" + QString::number(port);
  ActiveClient* ac;
  foreach(ac, myClients)
  {
    if(ac->serverAddressString() == fullAddress)
    {
      ac->client()->disconnect();
      delete ac;
      myClients.removeAll(ac);

      saveServerList();

      print("Client removed from watch list [" + fullAddress + "]\n");
      return true;
    }
  }
  print("Client not found on the list [" + fullAddress + "]\n");
  return false;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::activeClientsReplyCounters(int *serverCount, int *playerCount, ActiveClient *ignoreClient)
{
  ActiveClient* ac;

  foreach(ac, myClients)
  {
    if(ac == ignoreClient)
      continue;

    if(ac->client()->state() == Client::ConnectedState)
    {
      int pc = ac->playerCount();
      if(pc == 255 || pc == 0)
        pc = 0;
      else
        pc--;

      *playerCount += pc;
      (*serverCount)++;
    }
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::timerEvent(QTimerEvent *e)
{
  if(e->timerId() == myClientsFrameTimerID)
  {
    ActiveClient *ac;
    foreach(ac, myClients)
    {
      ac->run();
    }

    // HostNames scheduled daily refresh
    int currentHour = QTime::currentTime().hour();
    int refreshHour = Settings::globalInstance()->refreshHostNamesHour();
    if(currentHour == refreshHour && !myHostNamesRequested)
    {
      print("Refreshing hostname cache...\n");
      requestCachedHostNames();
      myHostNamesRequested = true;
    }
    else if(currentHour != refreshHour && myHostNamesRequested)
    {
      myHostNamesRequested = false;
    }
  }
  Sleeper::msleep(1);
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::requestBroadcast(const QString &type, const QString &user, const QString &server, const QString &message)
{
  if(!Settings::globalInstance()->developerMode())
    mySshClient->write("REQ_BC QWalt,-" + type + "-,qw://" + server + ",'" + user + "','" + message + "'\n");
  else
    mySshClient->write("REQ_BC QDEV,-dev-,qw://" + server + ",'" + user + "','" + message + "'\n");
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::addMessageToHistory(const QString &msg)
{
  myLastMessages.push_back(msg);
  if(myLastMessages.size() > 5)
    myLastMessages.removeAt(0);
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::broadcast(const QString &msg, ActiveClient* ignoredClient)
{
  ActiveClient* ac;
  QString frequency = msg.section(' ', 0, 0);

  addMessageToHistory(msg);

  foreach(ac, myClients)
  {
    if(ac == ignoredClient)
      continue;

    if((frequency == "-qw-" && ac->client()->isQWMuted()) || (frequency == "-spam-" && ac->client()->isSpamMuted()))
      continue;

    if(ac->client()->state() == Client::ConnectedState)
      ac->client()->say(msg);
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::broadcast(const QString &msg, int *serverCount, int *userCount)
{
  ActiveClient* ac;

  *serverCount = 0;
  *userCount = 0;

  QString frequency = msg.section(' ', 0, 0);

  addMessageToHistory(msg);

  foreach(ac, myClients)
  {
    if((frequency == "-qw-" && ac->client()->isQWMuted()) || (frequency == "-spam-" && ac->client()->isSpamMuted()))
      continue;

    if(ac->client()->state() == Client::ConnectedState)
    {
      ac->client()->say(msg);
      *userCount += ac->playerCount() - 1;
      (*serverCount)++;
    }
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::cleanup()
{
  ActiveClient* ac;
  foreach(ac, myClients)
  {
    ac->client()->disconnect();
    delete ac;
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::setReplyHashAndWaitForReply(const QString &serverAddress, const QString &hash)
{
  ActiveClient* ac;
  foreach(ac, myClients)
  {
    if(serverAddress == ac->serverAddressString())
    {
      ac->setReplyHashAndWaitForReply(hash);
      return;
    }
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
const QList<ActiveClient*> App::clients() const {
  return myClients;
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::incrementReplyCounters(const QString &hash, int userCount, int channelCount, int playerCount, int serverCount)
{
  ActiveClient* ac;
  foreach(ac, myClients)
  {
    if(ac->replyHash() == hash)
    {
      ac->incrementReplyCounters(userCount, channelCount, playerCount, serverCount);
      return;
    }
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::requestCachedHostNames()
{
  ActiveClient* ac;
  foreach(ac, myClients)
  {
    if (!ac->hasHostName()) {
      print("Requested HostName for server " + ac->serverAddressString() + "\n");
      mySshClient->write("REQ_DNS " + ac->serverAddressString() + "\n");
    }
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::setServerHostName(const QString &serverAddress, const QString &hostName)
{
  ActiveClient* ac;
  foreach(ac, myClients)
  {
    if(ac->serverAddressString() == serverAddress)
    {
      if (!ac->hasHostName() && ac->hostName() != hostName) {
        print("HostName for " + serverAddress + " set to " + hostName + "\n");
        ac->setHostName(hostName);
      }
      return;
    }
  }
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
QString App::serverHostName(const QString &serverAddress) const
{
  ActiveClient* ac;
  foreach(ac, myClients)
  {
    if(ac->serverAddressString() == serverAddress)
    {
      return ac->hostName();
    }
  }
  return QString();
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void App::onCentralConnection()
{
  print("Connected!\nRefreshing cached hostnames...\n");
  requestCachedHostNames();
}