#ifndef __JDAQTRIGGERCOUNTER__
#define __JDAQTRIGGERCOUNTER__

#include "JIO/JSerialisable.hh"
#include "JDAQ/JDAQRoot.hh"


namespace KM3NETDAQ {

  namespace {
    using JIO::JReader;
    using JIO::JWriter;
  }


  /**
   * Type definition of trigger counter.
   */
  typedef unsigned long long int                            JTriggerCounter_t;


  /**
   * Auxiliary class to count triggers.
   */
  class JDAQTriggerCounter {
  private:
    /**
     * Constructor.
     *
     * \param  counter        counter value
     */
    JDAQTriggerCounter(const JTriggerCounter_t counter)
    {
      this->trigger_counter = counter;
    }


  public:
    /**
     * Default constructor.
     *
     * This constructor increments the counter of the unique instance
     * of this class and stores the result in this object.
     */
    JDAQTriggerCounter()
    {
      trigger_counter = getInstance().next();
    }


    /**
     * Virtual destructor.
     */
    virtual ~JDAQTriggerCounter()
    {}


    /**
     * Get reference to unique instance of this class object.
     *
     * \return               reference to this class object
     */
    static JDAQTriggerCounter& getInstance()
    {
      static JDAQTriggerCounter counter(0);

      return counter;
    }


    /**
     * Reset counter of unique instance of this class object.
     */
    static void reset()
    {
      getInstance().trigger_counter = 0;
    }


    /**
     * Get trigger counter.
     *
     * \return                counter value
     */
    JTriggerCounter_t getCounter() const
    {
      return trigger_counter;
    }


    /**
     * Set trigger counter.
     *
     * \param  counter        counter value
     */
    void setCounter(const JTriggerCounter_t counter)
    {
      this->trigger_counter = trigger_counter;
    }


    /**
     * Increment trigger counter.
     *
     * \return                counter value
     */
    JTriggerCounter_t next()
    {
      return trigger_counter++;
    }


    /**
     * Read JDAQTriggerCounter from input.
     *
     * \param  in             JReader
     * \param  counter        JDAQTriggerCounter
     * \return                JReader
     */
    friend inline JReader& operator>>(JReader& in, JDAQTriggerCounter& counter)
    {
      in >> counter.trigger_counter;

      return in;
    }


    /**
     * Write JDAQTriggerCounter to output.
     *
     * \param  out           JWriter
     * \param  counter       JDAQTriggerCounter
     * \return               JWriter
     */
    friend inline JWriter& operator<<(JWriter& out, const JDAQTriggerCounter& counter)
    {
      out << counter.trigger_counter;

      return out;
    }


    /**
     * Get size of object.
     *
     * \return               number of bytes
     */
    static int sizeOf()
    {
      return sizeof(JTriggerCounter_t);
    }


    ClassDef(JDAQTriggerCounter,1);


  protected:
    JTriggerCounter_t trigger_counter;
  };
}

#endif