#ifndef __MAILABLE_H
#define __MAILABLE_H

#include "AxisAlignedBox3.h"
#include "Pvs.h"
#include <set>
#include "VssRay.h"

namespace GtpVisibilityPreprocessor {

#define MAX_THREADS 2

class Mailable {
public:
  enum {STD_MAILABLE=0, INTERSECTABLE };

  // last mail id -> warning not thread safe!
  // both mailId and mailbox should be unique for each thread!!!
  static int ssMailId[MAX_THREADS];
  
  /// Mailbox used for traversals
  int mMailbox[MAX_THREADS];
  
  // Get mailable Id has to be reimplemented for all objects which aim to
  // have independent mailing
  virtual int GetMailableId()
  {
	return STD_MAILABLE;
  }
  
  ////////////////////////////////////////////////
  //	Mailing stuff
  Mailable()
  {
	for (int i=0; i < MAX_THREADS; i++)
	  mMailbox[i] = 0;
  }
  
  static int GetThreadId();
  
  static void NewMail(const int reserve = 1) {
	int id = GetThreadId();
	ssMailId[id] += reserve;
  }
  
  void Mail() {
	int id = GetThreadId();
	Mail(id);
  }
  void Mail(const int threadId) {
	mMailbox[threadId] = ssMailId[threadId];
  }
  
  bool Mailed() const {
	int id = GetThreadId();
	return Mailed(id);
  }

  bool Mailed(const int threadId) const {
	return mMailbox[threadId] == ssMailId[threadId];
  }

  void MailSpecial(const int threadId, const int mailbox) {
	mMailbox[threadId] = ssMailId[threadId] + mailbox;
  }
  
  bool MailedSpecial(const int threadId, const int mailbox) const {
	return mMailbox[threadId] == ssMailId[threadId] + mailbox;
  }
  
  int IncMail(const int threadId) {
	return ++ mMailbox[threadId] - ssMailId[threadId];
  }
  
};

}

#endif