#include <string>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>
#include <limits>

#include "Jeep/JParser.hh"
#include "Jeep/JProperties.hh"
#include "Jeep/JTimer.hh"
#include "Jeep/JTimekeeper.hh"
#include "JLang/JSharedPointer.hh"
#include "JNet/JControlHost.hh"
#include "km3net-dataformat/online/JDAQ.hh"
#include "JDAQ/JDAQEventIO.hh"
#include "JTrigger/JTriggerParameters.hh"
#include "JSupport/JMultipleFileScanner.hh"
#include "JSupport/JSupport.hh"
#include "JSupport/JTriggerParametersSupportkit.hh"
#include "JRuncontrol/JDAQClient.hh"
#include "JIO/JByteArrayIO.hh"


namespace KM3NETDAQ {


  using namespace JPP;


  /**
   * Runcontrol client to simulate data filter(s).
   * In state running, this application will send events to the data writer.
   */
  class JEventGenerator :
    public JDAQClient
  {
  public:
    /**
     * Constructor.
     *
     * \param  name                 name of client
     * \param  server               name of command message server
     * \param  logger               pointer to logger
     * \param  level                debug level
     */
    JEventGenerator(const std::string& name,
		    const std::string& server,
		    JLogger*           logger,
		    const int          level) :
      JDAQClient(name, server, logger, level),
      datawriter()	
    {
      replaceEvent(RC_CMD, RC_EVTGENERATOR, ev_configure);

      JControlHost::Throw(true);
    }


    virtual void actionConfigure(int length, const char* buffer)
    {
      using namespace std;
      using namespace JPP;

      inputFile.clear();

      JString destination;

      JProperties properties(JEquationParameters("=", ";", "", ""));

      properties["datawriter"]     = destination  = "localhost";
      properties["inputFile"]      = inputFile;
      properties["eventRate_Hz"]   = eventRate_Hz = 1.0;
      
      properties.read(string(buffer, length));
      
      destination = destination.trim();

      try {
	datawriter.reset(new JControlHost(destination));
      }
      catch(const JControlHostException& exception) {
	JErrorStream(logger) << exception;
      }

      if (eventRate_Hz > 0.0)
	setClockInterval((long long int) (1.0e6 / eventRate_Hz));
      else
	setClockInterval(0ULL);

      parameters = getTriggerParameters(inputFile);

      JDebugStream(logger) << "Event interval time " << getClockInterval() << " us";
    }


    virtual void actionReset(int length, const char* buffer)
    {
      JDebugStream(logger) << "actionReset()";

      inputFile.rewind();

      datawriter.reset();
    }


    virtual void actionQuit(int length, const char* buffer)
    {}


    virtual void actionStart(int length, const char* buffer)
    {
      using namespace std;
      
      numberOfEvents = 0;
      numberOfBytes  = 0;

      ostringstream os;

      os << getRunNumber() << ' ' << parameters;

      datawriter->PutFullString(IO_TRIGGER_PARAMETERS, os.str());

      timer.reset();
    }


    virtual void actionStop(int length, const char* buffer)
    {
      JDebugStream(logger) << "actionStop()";

      if (timer.usec_wall > 0) JNoticeStream(logger) << "I/O [MB/s] "       << numberOfBytes   / timer.usec_wall;
      if (numberOfEvents  > 0) JNoticeStream(logger) << "Delay/event [ms] " << getClockDelay() / numberOfEvents / 1000;
    }


    virtual void actionRunning()
    {
      //JDebugStream(logger) << "actionRunning()";

      using namespace JPP;

      static JIO::JByteArrayWriter out;

      if (datawriter.is_valid()) {

	if (!inputFile.hasNext()) {
	  inputFile.rewind();
	}

	if (inputFile.hasNext()) {

	  timer.start();
	  
	  JDAQEvent* event = inputFile.next();
	  
	  event->setRunNumber(getRunNumber());
	  
	  out.clear();
	  
	  out << *event;
	  
	  try {
	    
	    datawriter->PutFullData(IO_EVENT, out.data(), out.size());
	    
	    numberOfEvents += 1;
	    numberOfBytes  += out.size();
	  }
	  catch(const JControlHostException& exception) {
	    JErrorStream(logger) << exception;
	  }
	  
	  timer.stop();
	}
      }

      //JDebugStream(logger) << "actionRunning() return";
    }


  private:
    JSharedPointer<JControlHost> datawriter;

    JTRIGGER::JTriggerParameters parameters;
    JSUPPORT::JMultipleFileScanner<KM3NETDAQ::JDAQEvent> inputFile;

    Long64_t      numberOfEvents;
    double        eventRate_Hz;

    JEEP::JTimer  timer;                // timer for I/O measurement
    long long int numberOfBytes;        // total number of bytes
  };
}


/**
 * \file
 *
 * Program for real-time simulation of data.
 * \author mdejong
 */
int main(int argc, char* argv[])
{
  using namespace std;

  string  server;
  string  logger;
  string  client_name;
  bool    use_cout;
  int     debug;

  try {

    JParser<> zap("Program for real-time simulation of data.");

    zap['H'] = make_field(server)          = "localhost";
    zap['M'] = make_field(logger)          = "localhost";
    zap['u'] = make_field(client_name)     = "%";
    zap['c'] = make_field(use_cout);
    zap['d'] = make_field(debug)           = 3;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }

  
  using namespace KM3NETDAQ;
  using namespace JPP;

  JLogger* out = NULL;

  if (use_cout)
    out = new JStreamLogger(cout);
  else
    out = new JControlHostLogger(logger);

  JEventGenerator enigma(getProcessName(client_name, argv[0]), server, out, debug);

  enigma.enter();
  enigma.run();
}