/* 
   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: Simon Hofmann 
   co-programmer:
*/

#include "sound_control.h"


using namespace std;

SoundControl* SoundControl::sound = SoundControl::getInstance();
SoundControl* SoundControl::singletonRef = NULL;


/** 
    \brief standard constructor 
    This constructor builds a SoundControl Object and initialises it .
    All sound output is handled by this singleton object.
*/ 
SoundControl::SoundControl() {
  this->init();

}

/** 
    \brief Default destructor 
*/ 
SoundControl::~SoundControl() 
{
  singletonRef = NULL;
}

/**
   \brief Returns a reference to the SoundControl singleton
*/
SoundControl* SoundControl::getInstance() {
  if (SoundControl::singletonRef) 
    return singletonRef;
  else
    return singletonRef = new SoundControl;
}

/** 
    \brief Is called by SoundControl object to initiate all values and to output some text
*/ 
void SoundControl::init(void) 
{ 
  this->sfx_channel1 = -1;
  this->sfx_channel2 = -1;
  this->finished = 0;
  this->volume = SDL_MIX_MAXVOLUME;
  this->track_number = 1;
  this->music = NULL;
  this->audio_rate = 44100;
  this->audio_channels = MIX_DEFAULT_CHANNELS;
  this->audio_buffers = 16384;
  this->bits = 0; 
  this->audio_format = MIX_DEFAULT_FORMAT;

  // initialize SDL
  this->isInit = false;
  if (SDL_Init(SDL_INIT_AUDIO))
    {
      PRINTF(1)("SDL-sound could not be initialized\n");
      return;
    }
  else
    this->isInit = true;
  
  Mix_QuerySpec(&this->audio_rate, &this->audio_format, &this->audio_channels); 
  this->bits=this->audio_format&0xFF; 
  PRINTF(3)("Opened audio at %d Hz %d bit %s, %d bytes audio buffer\n", this->audio_rate, this->bits, this->audio_channels > 1 ? "stereo" : "mono", this->audio_buffers ); 
  Mix_VolumeMusic(this->volume);

  if(Mix_OpenAudio(this->audio_rate, this->audio_format, this->audio_channels, this->audio_buffers))
    PRINTF(1)("Mix_OpenAudio: Failed to open audio!\n"); 
 
  
} 

/** 
    \brief Sets the number of output Channels
*/ 
void SoundControl::setNumberOfChannels(int number_of_channels) { 
  Mix_AllocateChannels(number_of_channels);
} 

/** 
    \brief Static function to play a .xm file 
    \param filename: self-explanatory 
*/ 
void SoundControl::playMod(char* fileName) {
  Mix_Chunk* chunk = Mix_LoadWAV(fileName); 
  if(Mix_PlayChannel(-1, chunk, 0) == -1) {
    printf("Mix_PlayChannel: %s\n", Mix_GetError());
  }
}

/** 
    \brief Static function to play a .wav file 
    \param filename: self-explanatory 
*/ 
void SoundControl::playWav(char* fileName) {
  Mix_Chunk* chunk = Mix_LoadWAV(fileName); 
  if(Mix_PlayChannel(-1, chunk, 0) == -1) {
    printf("Mix_PlayChannel: %s\n", Mix_GetError());
  }
} 

/** 
    \brief Static function to play an .ogg file 
    \param filename: self-explanatory 
*/ 
void SoundControl::playOgg(char* fileName) {
  Mix_Music* music = Mix_LoadMUS(fileName);
  if(Mix_PlayMusic(music, 1) == -1) {
    printf("Mix_PlayMusic: %s\n",Mix_GetError());
  }
  Mix_HookMusicFinished(musicDone);
} 

/** 
    \brief Heightens the overall volume of output 
*/ 
void SoundControl::volumeUp() { 
  this->volume = (this->volume++) << 1; 
  if(this->volume > SDL_MIX_MAXVOLUME) 
    this->volume = SDL_MIX_MAXVOLUME; 
  Mix_VolumeMusic(this->volume); 
} 


/** 
    \brief Lowers the overall volume of output 
*/  
void SoundControl::volumeDown() { 
  this->volume >>= 1;
  if(this->volume < 0)
    this->volume = 1;
  Mix_VolumeMusic(this->volume); 
} 

/** 
    \brief Rewinds music to the beginning 
*/  
void SoundControl::trackRewind() { 
  Mix_RewindMusic(); 
} 

/** 
    \brief Rewinds the music 5 seconds 
*/  
void SoundControl::forwardMusic() { 
  Mix_SetMusicPosition(+5); 
} 

/** 
    \brief Forwards the music 5 seconds 
*/  
void SoundControl::rewindMusic () { 
  Mix_SetMusicPosition(-5); 
} 

/** 
    \brief Pauses music output 
*/ 
void SoundControl::pauseMusic() {
  Mix_PauseMusic();
} 

/** 
    \brief Pauses music output 
*/ 
void SoundControl::resumeMusic() {
  Mix_ResumeMusic();
} 

/** 
    \brief Fades in music
*/ 
void fadeInMusic(int time) {

}

/** 
    \brief Fades out music
*/ 
void SoundControl::fadeOutMusic(int time) {

}

/** 
    \brief Hooked by playOgg at end of .ogg playback
*/ 
void SoundControl::musicDone()
{
  Mix_Music* music = SoundControl::getInstance()->music;
  Mix_HaltMusic();
  Mix_FreeMusic(music);
  music = NULL;
}