/*
   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: Benjamin Grauer
   co-programmer: ...

   code has been taken from http://www.devmaster.net/articles.php?catID=6
   The code has been applied to our needs, and many things have been changed.
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_SOUND

#include "sound_engine.h"

//#include <AL/alc.h> // maybe later
#include "class_list.h"

#include "p_node.h"
#include "list.h"
#include "resource_manager.h"
#include "debug.h"
#include "ini_parser.h"

using namespace std;


//////////////////
/* SOUND-ENGINE */
//////////////////
/**
 *  standard constructor
*/
SoundEngine::SoundEngine ()
{
  this->setClassID(CL_SOUND_ENGINE, "SoundEngine");
  this->setName("SoundEngine");

  this->listener = NULL;
  this->bufferList = NULL;
  this->sourceList = NULL;
}

/**
 *  the singleton reference to this class
*/
SoundEngine* SoundEngine::singletonRef = NULL;

/**
 *  standard deconstructor
 */
SoundEngine::~SoundEngine ()
{
  // deleting all the SoundSources
  if(this->sourceList != NULL)
  {
    tIterator<BaseObject>* sourceIterator = this->sourceList->getIterator();
    SoundSource* enumSource = (SoundSource*)sourceIterator->firstElement();
    while (enumSource)
    {
        delete enumSource;
        enumSource = (SoundSource*)sourceIterator->nextElement();
    }
    delete sourceIterator;
  }

  // deleting all the SoundBuffers
  if (this->bufferList != NULL)
  {
    tIterator<BaseObject>* bufferIterator = this->bufferList->getIterator();
    SoundBuffer* enumBuffer = (SoundBuffer*)bufferIterator->firstElement();
    while (enumBuffer)
    {
      ResourceManager::getInstance()->unload(enumBuffer);
      enumBuffer = (SoundBuffer*)bufferIterator->nextElement();
    }
    delete bufferIterator;
  }

  // removing openAL from AudioResource
  alutExit();

  SoundEngine::singletonRef = NULL;
}

/**
 * loads the settings of the SoundEngine from an ini-file
 * @param iniParser the IniParser of the inifile
 */
void SoundEngine::loadSettings(IniParser* iniParser)
{
  const char* musicVolume = iniParser->getVar(CONFIG_NAME_MUSIC_VOLUME, CONFIG_SECTION_AUDIO, "80");
  this->musicVolume = atof(musicVolume)/100.0;

  const char* effectsVolume = iniParser->getVar(CONFIG_NAME_EFFECTS_VOLUME, CONFIG_SECTION_AUDIO, "80");
  this->effectsVolume = atof(effectsVolume)/100.0;
}

/**
 *  creates a new SoundSource.
 * @param fileName The Name to load the SoundBuffer from
 * @param sourceNode The sourceNode to bind this SoundSource to.
 * @returns The newly created SoundSource

   acctualy this is nothing more than a wrapper around the ResourceManager.
*/
SoundSource* SoundEngine::createSource(const char* fileName, PNode* sourceNode)
{
  return new SoundSource(sourceNode, (SoundBuffer*)ResourceManager::getInstance()->load(fileName, WAV, RP_LEVEL));
}

/**
 *  Sets the doppler values of openAL
 * @param dopplerFactor the extent of the doppler-effect
 * @param dopplerVelocity the Speed the sound travels
*/
void SoundEngine::setDopplerValues(ALfloat dopplerFactor, ALfloat dopplerVelocity)
{
  alDopplerFactor(dopplerFactor);
  alDopplerVelocity(dopplerVelocity);
}


/**
 *  adds a SoundBuffer to the bufferList of the SoundEngine
 * @param buffer The buffer to add to the bufferList
*/
void SoundEngine::addBuffer(SoundBuffer* buffer)
{
  if (unlikely(this->bufferList == NULL))
    this->bufferList = ClassList::getList(CL_SOUND_BUFFER);
}

/**
 *  removes a SoundBuffer from the bufferList of the SoundEngine
 * @param buffer The buffer to delete from the SoundEngine
*/
void SoundEngine::removeBuffer(SoundBuffer* buffer)
{
  // look if there are any sources that have the buffer still loaded
  tIterator<BaseObject>* sourceIterator = this->sourceList->getIterator();
  SoundSource* enumSource = (SoundSource*)sourceIterator->firstElement();
  while (enumSource)
    {
      if (buffer == enumSource->getBuffer())
        delete enumSource;
      enumSource = (SoundSource*)sourceIterator->nextElement();
    }
  delete sourceIterator;
}

/**
 * adds a SoundSource to the sourceList of the SoundEngine
 * @param source The source to add to the sourceList
*/
void SoundEngine::addSource(SoundSource* source)
{
  this->sourceList = ClassList::getList(CL_SOUND_SOURCE);
}

/**
 *  updates all The positions, Directions and Velocities of all Sounds
*/
void SoundEngine::update()
{

  // updating the Listeners Position
  if (likely(this->listener != NULL))
    {
      alListener3f(AL_POSITION,
                   this->listener->getAbsCoor().x,
                   this->listener->getAbsCoor().y,
                   this->listener->getAbsCoor().z);
      alListener3f(AL_VELOCITY,
                   this->listener->getVelocity().x,
                   this->listener->getVelocity().y,
                   this->listener->getVelocity().z);
      Vector absDirV = this->listener->getAbsDirV();
      ALfloat orientation [6] = {1,0,0, absDirV.x, absDirV.y, absDirV.z};
      alListenerfv(AL_ORIENTATION, orientation);
    }
  else
    PRINTF(2)("no listener defined\n");

  // updating all the Sources positions
  if (likely(this->sourceList != NULL))
  {
    tIterator<BaseObject>* iterator = this->sourceList->getIterator();
    SoundSource* enumSource = (SoundSource*)iterator->firstElement();
    while (enumSource)
    {
      if (likely(enumSource->getNode() != NULL))
      {
        alSource3f(enumSource->getID(), AL_POSITION,
                   enumSource->getNode()->getAbsCoor().x,
                   enumSource->getNode()->getAbsCoor().y,
                   enumSource->getNode()->getAbsCoor().z);
        alSource3f(enumSource->getID(), AL_VELOCITY,
                   enumSource->getNode()->getVelocity().x,
                   enumSource->getNode()->getVelocity().y,
                   enumSource->getNode()->getVelocity().z);
      }
      enumSource = (SoundSource*)iterator->nextElement();
    }
    delete iterator;
  }
}

/**
 *  Removes all the Buffers that are not anymore needed by any Sources
*/
void SoundEngine::flushUnusedBuffers()
{
  if(this->sourceList && this->bufferList)
  {
    tIterator<BaseObject>* bufferIterator = this->bufferList->getIterator();
    SoundBuffer* enumBuffer = (SoundBuffer*)bufferIterator->firstElement();
    while (enumBuffer)
    {
      tIterator<BaseObject>* sourceIterator = this->sourceList->getIterator();
      SoundSource* enumSource = (SoundSource*)sourceIterator->firstElement();
      while (enumSource)
      {
        if (enumBuffer == enumSource->getBuffer())
          break;
        enumSource = (SoundSource*)sourceIterator->nextElement();
      }
      delete sourceIterator;
      if (enumSource == NULL)
        ResourceManager::getInstance()->unload(enumBuffer);
      enumBuffer = (SoundBuffer*)bufferIterator->nextElement();
    }
    delete bufferIterator;
  }
}

/**
 * flushes all the Buffers
 * deletes them from the BufferList, and also removes them via the ResourceManager.
 */
void SoundEngine::flushAllBuffers()
{
  if (this->bufferList)
  {
    tIterator<BaseObject>* bufferIterator = this->bufferList->getIterator();
    SoundBuffer* enumBuffer = (SoundBuffer*)bufferIterator->firstElement();
    while (enumBuffer)
    {
      ResourceManager::getInstance()->unload(enumBuffer, RP_LEVEL);
      enumBuffer = (SoundBuffer*)bufferIterator->nextElement();
    }
    delete bufferIterator;
  }
}

/**
 * deletes all the Sources.
 */
void SoundEngine::flushAllSources()
{
  if (this->sourceList)
  {
    tIterator<BaseObject>* Iterator = this->sourceList->getIterator();
    SoundSource* enumSource = (SoundSource*)Iterator->firstElement();
    while (enumSource)
    {
      delete enumSource;
      enumSource = (SoundSource*)Iterator->nextElement();
    }
    delete Iterator;
  }
}

/**
 *  initializes Audio in general
*/
bool SoundEngine::initAudio()
{
  ALenum result;
  PRINTF(3)("Initialisazing openAL sound engine\n");
  const char* defaultDevice =(const char*) alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER);
  const char* deviceList = (const char*)alcGetString(NULL,ALC_DEVICE_SPECIFIER);
  const char* devWalk = deviceList;
  if (alcIsExtensionPresent(NULL, (ALubyte*)"ALC_ENUMERATION_EXT") == AL_TRUE) { // try out enumeration extension
    PRINTF(3)("Enumeration-extension found\n");

    PRINTF(3)("Default device: %s\n", defaultDevice);
    do
    {
      PRINTF(3)("%s\n", devWalk);
      devWalk += strlen(devWalk)+1;
    } while (devWalk[0] != '\0');


  }


  alutInit(NULL, 0);
  if ((result = alGetError()) != AL_NO_ERROR)
    SoundEngine::PrintALErrorString(result);

  this->setDopplerValues(SOUND_DOPPLER_FACTOR, SOUND_DOPPLER_VELOCITY);
}

/**
 *  Transforms AL-errors into something readable
 * @param err The error found
*/
void SoundEngine::PrintALErrorString(ALenum err)
{
  switch(err)
    {
    case AL_NO_ERROR:
      PRINTF(4)("AL_NO_ERROR\n");
      break;

    case AL_INVALID_NAME:
      PRINTF(2)("AL_INVALID_NAME\n");
      break;

    case AL_INVALID_ENUM:
      PRINTF(2)("AL_INVALID_ENUM\n");
      break;

    case AL_INVALID_VALUE:
      PRINTF(2)("AL_INVALID_VALUE\n");
      break;

    case AL_INVALID_OPERATION:
      PRINTF(2)("AL_INVALID_OPERATION\n");
      break;

    case AL_OUT_OF_MEMORY:
      PRINTF(2)("AL_OUT_OF_MEMORY\n");
      break;
    };
}

void SoundEngine::listDevices()
{

  printf("%s\n",(const char*)alcGetString(NULL, ALC_DEVICE_SPECIFIER));
}

/*
void SoundEngine::PrintALCErrorString(ALenum err)
{
  switch(err)
    {
    case ALC_NO_ERROR:
      PRINTF(4)("AL_NO_ERROR\n");
      break;

    case ALC_INVALID_DEVICE:
      PRINTF(2)("ALC_INVALID_DEVICE\n");
      break;

    case ALC_INVALID_CONTEXT:
      PRINTF(2)("ALC_INVALID_CONTEXT\n");
      break;

    case ALC_INVALID_ENUM:
      PRINTF(2)("ALC_INVALID_ENUM\n");
      break;

    case ALC_INVALID_VALUE:
      PRINTF(2)("ALC_INVALID_VALUE\n");
      break;

    case ALC_OUT_OF_MEMORY:
      PRINTF(2)("ALC_OUT_OF_MEMORY\n");
      break;
    };
}
*/