/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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 2, or (at your option)
   any later version.


### File Specific:
   main-programmer: Christoph Renner (rennerc@ee.ethz.ch)
   co-programmer: Patrick Boenzli (patrick@orxonox.ethz.ch)
*/

#define DEBUG_MODULE_NETWORK

#include "shared_network_data.h"
#include "network_stream.h"
#include "netdefs.h"
#include "network_log.h"
#include "network_game_manager.h"

#include "state.h"

#include <cassert>

#include "synchronizeable.h"

#include "converter.h"



/**
 *  default constructor
 */
Synchronizeable::Synchronizeable()
{
  this->setClassID(CL_SYNCHRONIZEABLE, "Synchronizeable");
  this->owner = 0;
//   this->setIsServer(SharedNetworkData::getInstance()->getHostID() == 0);
  this->uniqueID = NET_UID_UNASSIGNED;
  this->networkStream = NULL;
  this->bSynchronize = false;

  if( State::isOnline())
  {
    NetworkStream* nd = SharedNetworkData::getInstance()->getDefaultSyncStream();
    assert(nd != NULL);
    nd->connectSynchronizeable(*this);
    this->setUniqueID(SharedNetworkData::getInstance()->getNewUniqueID());
  }

  /* make sure loadClassId is first synced var because this is read by networkStream */
  assert( syncVarList.size() == 0 );
  mLeafClassId = this->registerVarId( new SynchronizeableInt( (int*)&this->getLeafClassID(), (int*)&this->getLeafClassID(), "leafClassId" ) );

  this->registerVar( new SynchronizeableInt( &this->owner, &this->owner, "owner" ) );
  this->registerVar( new SynchronizeableString( &this->objectName, &this->objectName, "objectName" ) );
}



/**
 *  default destructor deletes all unneded stuff
 */
Synchronizeable::~Synchronizeable()
{
  if ( this->networkStream )
  {
    this->networkStream->disconnectSynchronizeable(*this);

    if ( (SharedNetworkData::getInstance()->isMasterServer() /*|| SharedNetworkData::getInstance()->isProxyServerActive()*/ )
           && this->beSynchronized() && this->getUniqueID() > 0 && !this->isA( CL_MESSAGE_MANAGER ) )
      NetworkGameManager::getInstance()->removeSynchronizeable( this->getUniqueID() );
  }

  for ( SyncVarList::iterator it = syncVarList.begin(); it != syncVarList.end(); it++ )
  {
    delete *it;
  }
  syncVarList.clear();

  for ( UserStateHistory::iterator it = recvStates.begin(); it != recvStates.end(); it++ )
  {
    for ( StateHistory::iterator it2 = it->begin(); it2 != it->end(); it2++ )
    {
      if ( (*it2)->data )
      {
        delete [] (*it2)->data;
        (*it2)->data = NULL;
      }
      delete *it2;
    }

  }

  for ( UserStateHistory::iterator it = sentStates.begin(); it != sentStates.end(); it++ )
  {
    for ( StateHistory::iterator it2 = it->begin(); it2 != it->end(); it2++ )
    {
      if ( (*it2)->data )
      {
        delete [] (*it2)->data;
        (*it2)->data = NULL;
      }
      delete *it2;
    }
  }
}



/**
 * creates a diff image from two states
 * @param userId: the userid of the user where the image will be sent to
 * @param data: the binary data array to write to
 * @param maxLength: maximal length of the data written (length of available space in the array)
 * @param stateId: the state id that this diff will represent
 * @param priorityTH: the priority threshold: all syncs below this threshold won't be synchronized
 *
 * @todo check for permissions
 */
int Synchronizeable::getStateDiff( int userId, byte* data, int maxLength, int stateId, int fromStateId, int priorityTH )
{
  //make sure this user has his history
  if ( sentStates.size() <= userId )
    sentStates.resize( userId+1 );

  //calculate needed memory
  int neededSize = 0;

  for ( SyncVarList::iterator it = syncVarList.begin(); it != syncVarList.end(); it++ )
  {
    //PRINTF(0)("SIZE = %d %s\n", (*it)->getSize(), (*it)->getName().c_str());
    neededSize += (*it)->getSize();
  }

  if ( !( neededSize <= maxLength ) )
  {
    PRINTF(0)( "%d > %d\n", neededSize, maxLength );
    assert(false);
  }

  //remove older states from history than fromStateId
  StateHistory::iterator it = sentStates[userId].begin();

  while ( it != sentStates[userId].end() && (*it)->stateId < fromStateId )
    it++;

  if ( it != sentStates[userId].begin() )
  {
    for ( StateHistory::iterator it2 = sentStates[userId].begin(); it2 != it; it2++ )
    {
      if ( (*it2)->data != NULL )
      {
        delete [] (*it2)->data;
        (*it2)->data = NULL;
      }

      delete *it2;
    }
    sentStates[userId].erase( sentStates[userId].begin(), it );
  }

  //find state to create diff from
  StateHistoryEntry * stateFrom = NULL;

  it = sentStates[userId].begin();
  while ( it != sentStates[userId].end() && (*it)->stateId != fromStateId )
    it++;

  if ( it == sentStates[userId].end() )
  {
    StateHistoryEntry * initialEntry = new StateHistoryEntry();

    initialEntry->stateId = fromStateId;
    initialEntry->dataLength = 0;
    initialEntry->data = NULL;

    stateFrom = initialEntry;

    sentStates[userId].push_back( stateFrom );
  }
  else
    stateFrom = (*it);

  StateHistoryEntry * stateTo = new StateHistoryEntry;

  sentStates[userId].push_back( stateTo );

  stateTo->stateId = stateId;
  stateTo->dataLength = neededSize;
  stateTo->data = new byte[ neededSize ];

  std::list<int>::iterator sizeIter = stateFrom->sizeList.begin();

  int i = 0;
  int n;

  bool hasPermission = false;
  bool sizeChanged = false;

  // now do the actual synchronization: kick all variables to write into a common buffer
  for ( SyncVarList::iterator it = syncVarList.begin(); it != syncVarList.end(); it++ )
  {
    // DATA PERMISSIONS
    // check if this synchronizeable has the permissions to write the data

    // first check MASTER_SERVER permissions
    if( SharedNetworkData::getInstance()->isMasterServer() && (*it)->checkPermission( PERMISSION_MASTER_SERVER ))
      hasPermission = true;
    // now check PROXY_SERVER permissions
    else if( SharedNetworkData::getInstance()->isProxyServerActive() && (*it)->checkPermission( PERMISSION_PROXY_SERVER ))
      hasPermission = true;
    // now check OWNER permissions
    else if( this->owner == SharedNetworkData::getInstance()->getHostID() && (*it)->checkPermission( PERMISSION_OWNER ))
      hasPermission = true;
    // now check ALL permissions
    else if( (*it)->checkPermission( PERMISSION_ALL ))
      hasPermission = true;
    // SPECIAL: get write permissions if i am master server and i am able to overwrite the client stuff
    else if( SharedNetworkData::getInstance()->isMasterServer() && this->owner != userId && (*it)->checkPermission( PERMISSION_OWNER ))
      hasPermission = true;
    // SPECIAL: get write permissions if i am proxy server and i am able to overwrite the client stuff
    else if( SharedNetworkData::getInstance()->isProxyServerActive()  && this->owner != userId && (*it)->checkPermission( PERMISSION_OWNER ))
      hasPermission = true;
    else
      hasPermission = false;


    if ( sizeIter == stateFrom->sizeList.end() || *sizeIter != (*it)->getSize() )
      sizeChanged = true;

    if ( ( hasPermission && (*it)->getPriority() >= priorityTH ) || sizeChanged )
    {
      n = (*it)->writeToBuf( stateTo->data+i, stateTo->dataLength - i );
      //NETPRINTF(0)("getvar %s %d\n", (*it)->getName().c_str(), n);
      //PRINTF(0)("getvar %s %d\n", (*it)->getName().c_str(), n);
      stateTo->sizeList.push_back( n );
      // this is only for very hardcore debug sessions
      // (*it)->debug();
      i += n;
    }
    else
    {
      for ( int j = 0; j<(*sizeIter); j++ )
      {
        assert( i < stateFrom->dataLength );
        stateTo->data[i] = stateFrom->data[i];
        i++;
      }
      //NETPRINTF(0)("getvar %s %d\n", (*it)->getName().c_str(), *sizeIter);
      stateTo->sizeList.push_back( (*sizeIter) );
    }

    if ( sizeIter != stateFrom->sizeList.end() )
      sizeIter++;
  }

  if ( i != neededSize )
  {
    PRINTF(0)("strange error: (%s) %d != %d\n", this->getClassCName(), i, neededSize);
    assert(false);
  }

  //write diff to data
  for ( i = 0; i<neededSize; i++ )
  {
    if ( i < stateFrom->dataLength )
      data[i] = stateTo->data[i] - stateFrom->data[i];
    else
      data[i] = stateTo->data[i];
  }

  return neededSize;
}

/**
 * sets a new state out of a diff created on another host
 * @param userId hostId of user who send me that diff
 * @param data pointer to diff
 * @param length length of diff
 * @param stateId id of current state
 * @param fromStateId id of the base state id
 * @return number bytes read
 *
 * @todo check for permissions
 */
int Synchronizeable::setStateDiff( int userId, byte* data, int length, int stateId, int fromStateId )
{
  //make sure this user has his history
  if ( recvStates.size() <= userId )
    recvStates.resize( userId+1 );

  //create new state
  StateHistoryEntry * stateTo = new StateHistoryEntry();
  stateTo->stateId = stateId;
  stateTo->dataLength = length;
  stateTo->data = new byte[ length ];


  //find state to apply diff to
  StateHistoryEntry * stateFrom = NULL;

  // search the state from wich the diff is made of
  StateHistory::iterator it = recvStates[userId].begin();
  while ( it != recvStates[userId].end() && (*it)->stateId != fromStateId )
    it++;

  // if this is the first state to receive
  if ( it == recvStates[userId].end() )
  {
    StateHistoryEntry * initialEntry = new StateHistoryEntry();

    initialEntry->stateId = fromStateId;
    initialEntry->dataLength = 0;
    initialEntry->data = NULL;

    stateFrom = initialEntry;

    recvStates[userId].push_back( stateFrom );
  }
  else
    stateFrom = (*it);


  // apply diff
  for ( int i = 0; i<length; i++ )
  {
    if ( i < stateFrom->dataLength )
      stateTo->data[i] = stateFrom->data[i] + data[i];
    else
      stateTo->data[i] = data[i];
  }

  //add state to state history
  recvStates[userId].push_back( stateTo );

  int i = 0;
  int n = 0;
  std::list<int> changes;
  bool hasPermission = false;

  // extract the new state for every client
  for ( SyncVarList::iterator it = syncVarList.begin(); it != syncVarList.end(); it++ )
  {
    // DATA PERMISSIONS
    // check if this synchronizeable has the permissions to write the data

    // first check MASTER_SERVER permissions
    if(  this->networkStream->isUserMasterServer( userId ) && (*it)->checkPermission( PERMISSION_MASTER_SERVER ))
      hasPermission = true;
    // now check PROXY_SERVER permissions
    else if( this->networkStream->isUserProxyServerActive( userId )  && (*it)->checkPermission( PERMISSION_PROXY_SERVER ))
      hasPermission = true;
    // now check OWNER permissions
    else if( this->owner == userId && (*it)->checkPermission( PERMISSION_OWNER ))
      hasPermission = true;
    // now check ALL permissions
    else if( (*it)->checkPermission( PERMISSION_ALL ))
      hasPermission = true;
    // SPECIAL: get write permissions if im sending to a master server that does not own this sync
    else if( this->networkStream->isUserMasterServer( userId ) && this->owner != SharedNetworkData::getInstance()->getHostID() && (*it)->checkPermission( PERMISSION_OWNER ))
      hasPermission = true;
    // SPECIAL: get write permissions if im sending to a proxy server that does not own this sync
    else if( this->networkStream->isUserProxyServerActive( userId )  && this->owner != SharedNetworkData::getInstance()->getHostID() && (*it)->checkPermission( PERMISSION_OWNER ))
      hasPermission = true;
    else
      hasPermission = false;



    // if it has the permission to write do it
    if( hasPermission)
    {
      n = (*it)->readFromBuf( stateTo->data + i, stateTo->dataLength - i );
      i += n;
      //NETPRINTF(0)("%s::setvar %s %d\n", getClassCName(), (*it)->getName().c_str(), n);
      //PRINTF(0)("%s::setvar %s %d\n", getClassCName(), (*it)->getName().c_str(), n);
      //(*it)->debug();
      if ( (*it)->getHasChanged() )
      {
        changes.push_back( (*it)->getVarId() );
      }
    }
    else
    {
//      PRINTF(0)("DONT SET VAR BECAUSE OF PERMISSION: %s %d %d %d %d %d %d\n", (*it)->getName().c_str(), (*it)->checkPermission( PERMISSION_MASTER_SERVER ), (*it)->checkPermission( PERMISSION_OWNER ), (*it)->checkPermission( PERMISSION_ALL ), networkStream->isUserServer( userId ), this->owner, userId );
      n = (*it)->getSizeFromBuf( stateTo->data + i, stateTo->dataLength - i );
      //NETPRINTF(0)("%s::setvar %s %d\n", getClassCName(), (*it)->getName().c_str(), n);
      //(*it)->debug();
      i += n;
    }
  }

  this->varChangeHandler( changes );

  return i;
}

 /**
 * override this function to be notified on change
 * of your registred variables.
 * @param id id's which have changed
 */
void Synchronizeable::varChangeHandler( std::list<int> & id )
{
}

/**
 * registers a varable to be synchronized over network
 * @param var see src/lib/network/synchronizeable_var/ for available classes
 */
void Synchronizeable::registerVar( SynchronizeableVar * var )
{
  syncVarList.push_back( var );
}

/**
 * registers a varable to be synchronized over network
 * return value is passed to varChangeHandler on change
 * @param var see src/lib/network/synchronizeable_var/ for available classes
 * @return handle passed to varChangeHandler on changes
 */
int Synchronizeable::registerVarId( SynchronizeableVar * var )
{
  syncVarList.push_back( var );
  var->setWatched( true );
  var->setVarId( syncVarList.size()-1 );
  return syncVarList.size()-1;
}

/**
 * removed user's states from memory
 * @param userId user to clean
 */
void Synchronizeable::cleanUpUser( int userId )
{
  if ( recvStates.size() > userId )
  {
    for ( std::list<StateHistoryEntry*>::iterator it = recvStates[userId].begin(); it != recvStates[userId].end(); it++ )
    {
      if ( (*it)->data )
      {
        delete [] (*it)->data;
        (*it)->data = NULL;
      }

      delete *it;
    }
    recvStates[userId].clear();
  }

  if ( sentStates.size() > userId )
  {

    for ( std::list<StateHistoryEntry*>::iterator it = sentStates[userId].begin(); it != sentStates[userId].end(); it++ )
    {
      if ( (*it)->data )
      {
        delete [] (*it)->data;
        (*it)->data = NULL;
      }

      delete *it;
    }
    sentStates[userId].clear();
  }
}

/**
 * this function is called after recieving a state.
 * @param userId
 * @param stateId
 * @param fromStateId
 */
void Synchronizeable::handleRecvState( int userId, int stateId, int fromStateId )
{
   //make sure this user has his history
  if ( recvStates.size() <= userId )
    recvStates.resize( userId+1 );

  //remove old states
  StateHistory::iterator it = recvStates[userId].begin();

#if 0
  while ( it != recvStates[userId].end() && (*it)->stateId < fromStateId )
    it++;

  if ( it != recvStates[userId].begin() )
  {
    for ( StateHistory::iterator it2 = recvStates[userId].begin(); it2 != it; it2++ )
    {
      if ( (*it2)->data != NULL )
      {
        delete [] (*it2)->data;
        (*it2)->data = NULL;
      }
    }
    recvStates[userId].erase( recvStates[userId].begin(), it );
  }
#endif

  for ( it = recvStates[userId].begin(); it != recvStates[userId].end();  )
  {
    if ( (*it)->stateId < fromStateId )
    {
      StateHistory::iterator delIt = it;
      it ++;

      if ( (*delIt)->data )
      {
        delete [] (*delIt)->data;
        (*delIt)->data = NULL;
      }
      delete *delIt;
      recvStates[userId].erase( delIt );

      continue;
    }
    it++;
  }

  StateHistory::iterator fromState = recvStates[userId].end();
  StateHistory::iterator toState = recvStates[userId].end();

  for ( it = recvStates[userId].begin(); it != recvStates[userId].end(); it++ )
  {
    if ( (*it)->stateId == stateId )
      toState = it;
    if ( (*it)->stateId == fromStateId )
      fromState = it;

    if ( fromState != recvStates[userId].end() && toState != recvStates[userId].end() )
      break;
  }

  // setStateDiff was not called and i know fromStateId
  if ( fromState != recvStates[userId].end() && toState == recvStates[userId].end() )
  {
    StateHistoryEntry * entry = new StateHistoryEntry;

    entry->dataLength = (*fromState)->dataLength;
    if ( entry->dataLength > 0 )
    {
      entry->data = new byte[entry->dataLength];

      assert( (*fromState)->data );
      memcpy( entry->data, (*fromState)->data, entry->dataLength );
    }
    else
      entry->data = NULL;

    entry->sizeList = (*fromState)->sizeList;
    entry->stateId = stateId;

    recvStates[userId].push_back(entry);
  }
}

/**
 * this function is called after sending a state
 * @param userId
 * @param stateId
 * @param fromStateId
 */
void Synchronizeable::handleSentState( int userId, int stateId, int fromStateId )
{
   //make sure this user has his history
  if ( sentStates.size() <= userId )
    sentStates.resize( userId+1 );

   //remove old states
  StateHistory::iterator it = sentStates[userId].begin();

  for ( it = sentStates[userId].begin(); it != sentStates[userId].end();  )
  {
    if ( (*it)->stateId < fromStateId )
    {
      StateHistory::iterator delIt = it;
      it ++;

      if ( (*delIt)->data )
      {
        delete [] (*delIt)->data;
        (*delIt)->data = NULL;
      }
      delete *delIt;
      sentStates[userId].erase( delIt );

      continue;
    }
    it++;
  }


  StateHistory::iterator fromState = sentStates[userId].end();
  StateHistory::iterator toState = sentStates[userId].end();

  for ( it = sentStates[userId].begin(); it != sentStates[userId].end(); it++ )
  {
    if ( (*it)->stateId == stateId )
      toState = it;
    if ( (*it)->stateId == fromStateId )
      fromState = it;

    if ( fromState != sentStates[userId].end() && toState != sentStates[userId].end() )
      break;
  }


  // getStateDiff was not called and i know fromStateId
  if ( fromState != sentStates[userId].end() && toState == sentStates[userId].end() )
  {
    StateHistoryEntry * entry = new StateHistoryEntry;

    entry->dataLength = (*fromState)->dataLength;
    if ( entry->dataLength > 0 )
    {
      entry->data = new byte[entry->dataLength];

      assert( (*fromState)->data );
      memcpy( entry->data, (*fromState)->data, entry->dataLength );
    }
    else
      entry->data = NULL;

    entry->sizeList = (*fromState)->sizeList;
    entry->stateId = stateId;

    sentStates[userId].push_back(entry);
  }

}