/*
   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: ...

    Beware:
   The Ogg-Player is a __Threaded__ Stream, this means, that invoking play()
   creates a Thread, that loops through the Music-File. The Thread seems
   to be safe, but it is not guarantied.

   -------------------------------------------------------------------
   A Simple Version of this can be found at http://www.devmaster.net
   Thanks a lot for the nice work, and the easy portability to our Project.
*/
#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_SOUND

#include <iostream>

#include "ogg_player.h"

#include "sound_engine.h"

#include "debug.h"

namespace OrxSound
{
  /**
   * initializes an Ogg-player from a file
   * @param fileName the file to load
   */
  OggPlayer::OggPlayer(const std::string& fileName)
  {
    this->setClassID(CL_SOUND_OGG_PLAYER, "OggPlayer");

    this->state = OggPlayer::None;

    this->source = 0;
    this->buffers[0] = 0;
    this->buffers[1] = 0;
    this->musicThreadID = NULL;
    this->musicMutex = SDL_CreateMutex();

    if (!fileName.empty())
    {
      if (this->open(fileName))
        this->setName(fileName);
    }

  }

  /**
   * @brief deletes the OggPlayer
   */
  OggPlayer::~OggPlayer()
  {
    this->release();
    SDL_DestroyMutex(this->musicMutex);
  }

  ///////////////
  // INTERFACE //
  ///////////////
  /**
   * @brief opens a file for playback
   * @param fileName the file to open
   */
  bool OggPlayer::open(const std::string& fileName)
  {
    MutexLock(this->musicMutex);
    // release old Ogg-File (if loaded)
    if (this->state & OggPlayer::FileOpened)
      this->release();

    // allocating Buffers
    if (this->buffers[0] == 0)
      alGenBuffers(2, this->buffers);
    SoundEngine::checkError("Allocating Buffers", __LINE__);
    if (this->buffers[0] != 0 && this->buffers[1] != 0)
      state |= OggPlayer::BuffersAllocated;
    else
    {
      PRINTF(2)("Unable to allocate al-Buffers\n");
      this->release();
      return false;
    }
    // allocating source
    if (this->source == 0)
      SoundEngine::getInstance()->popALSource(this->source);
    if (this->source != 0)
      state |= OggPlayer::SourceAllocated;
    else
    {
      PRINTF(2)("No more Sources Availiable (maybe you should consider raising the source-count.)\n");
      this->release();
      return false;
    }

    // opening the FILE;
    int result;
    if(!(oggFile = fopen(fileName.c_str(), "rb")))
    {
      PRINTF(2)("Could not open Ogg file.");
      this->release();
      return false;
    }
    // reading the Stream.
    if((result = ov_open(oggFile, &oggStream, NULL, 0)) < 0)
    {
      PRINTF(2)("Could not open Ogg stream. %s", getVorbisError(result));
      fclose(oggFile);
      this->release();
      return false;
    }
    this->state |= OggPlayer::FileOpened;

    // acquiring the vorbis-properties.
    vorbisInfo = ov_info(&oggStream, -1);
    vorbisComment = ov_comment(&oggStream, -1);

    if(vorbisInfo->channels == 1)
      format = AL_FORMAT_MONO16;
    else
      format = AL_FORMAT_STEREO16;

    // setting the Source Properties.
    alSource3f(source, AL_POSITION,        0.0, 0.0, 0.0);
    alSource3f(source, AL_VELOCITY,        0.0, 0.0, 0.0);
    alSource3f(source, AL_DIRECTION,       0.0, 0.0, 0.0);
    alSourcef (source, AL_ROLLOFF_FACTOR,  0.0          );
    alSourcei (source, AL_SOURCE_RELATIVE, AL_TRUE      );
    alSourcef (source, AL_GAIN,            SoundEngine::getInstance()->getMusicVolume());
    SoundEngine::checkError("OggPlayer::open()::SetSourceProperties", __LINE__);

    // Set to State Stopped
    this->state |= OggPlayer::Stopped;
    return true;
  }


  /**
   * @brief start Playing Music.
   * @returns true on success false otherwise.
   */
  bool OggPlayer::play()
  {
    if (!(this->state & OggPlayer::FileOpened))
      return false;

    this->state &= ~(OggPlayer::Stopped | OggPlayer::Paused);

    if (!this->playback())
      return false;

    if (this->musicThreadID == NULL)
      return ((this->musicThreadID = SDL_CreateThread(OggPlayer::musicThread, (void*)this)) != NULL);
    return true;
  }

  /**
   * @brief stop the OggPlayer from Playing.
   */
  void OggPlayer::stop()
  {
    this->state &= ~(OggPlayer::Playing | OggPlayer::Paused);
    this->state |= OggPlayer::Stopped;

    this->suspend();
    this->rewind();
  }

  /**
   * @brief Pause the Playing.
   */
  void OggPlayer::pause()
  {
    this->state &= ~OggPlayer::Playing;

    if (!(this->state & OggPlayer::Stopped))
      this->state |= OggPlayer::Paused;

    this->suspend();
  }

  /**
   * @brief rewind to the beginning, and play (if already playing)
   */
  void OggPlayer::rewind()
  {
    this->jumpTo(0.0f);
  }

  /**
   * @brief jump to Second timeCode in the MusicFile
   * @param timeCode where to jump to.
   */
  void OggPlayer::jumpTo(float timeCode)
  {

    if (this->state & OggPlayer::FileOpened)
    {
      SDL_mutexP(this->musicMutex);
      ov_time_seek(&this->oggStream, timeCode);
      SDL_mutexV(this->musicMutex);
    }
  }

  /**
   * @returns the Length of the Music in Seconds
   */
  float OggPlayer::length()
  {
    if (this->state & OggPlayer::FileOpened)
      return ov_time_total(&this->oggStream, -1);
    else
      return 0.0f;
  }


  /**
   * @returns true if the file is playing
   */
  bool OggPlayer::isPlaying()
  {
    if (!(this->state & OggPlayer::FileOpened))
      return false;
    ALenum state;

    alGetSourcei(this->source, AL_SOURCE_STATE, &state);

    return (state == AL_PLAYING);
  }



  ////////////////////////
  // INTERNAL FUNCTIONS //
  ////////////////////////
  /**
   * @brief creates a Thread for Playing back the music even if the rest of the Engine is slow
   * @param oggPlayer the OggPlayer to play back
   * @returns -1 on error.
   */
  int OggPlayer::musicThread(void* oggPlayer)
  {
    if (oggPlayer == NULL)
      return -1;
    OggPlayer* ogg = (OggPlayer*)oggPlayer;

    PRINTF(4)("STARTIG AUDIO THREAD\n");
    while (ogg->state & OggPlayer::Playing)
    {
      SDL_mutexP(ogg->musicMutex);
      ogg->update();
      SDL_mutexV(ogg->musicMutex);
      SDL_Delay(1);
    }
    PRINTF(4)("End the AudioThread\n");
  }


  /**
   * @brief plays back the sound
   * @return true if running, false otherwise
   */
  bool OggPlayer::playback()
  {
    if (!(this->state & OggPlayer::FileOpened))
      return false;

    if(this->state & OggPlayer::Playing)
      return true;
    this->state |= OggPlayer::Playing;

    SDL_mutexP(this->musicMutex);
    if(!this->stream(this->buffers[0]) || !this->stream(this->buffers[1]))
    {
      SDL_mutexV(this->musicMutex);
      this->state &= ~OggPlayer::Playing;
      return false;
    }

    alSourceQueueBuffers(this->source, 2, this->buffers);
    if (DEBUG_LEVEL >= 3)
      SoundEngine::checkError("OggPlayer::playback()::alSourceQueueBuffers", __LINE__);

    alSourcePlay(this->source);
    if (DEBUG_LEVEL >= 3)
      SoundEngine::checkError("OggPlayer::playback()::alSourcePlay", __LINE__);
    SDL_mutexV(this->musicMutex);
    return true;
  }


  /**
   * @brief waits for the AudioThread to be finished.
   */
  void OggPlayer::suspend()
  {
    if (this->musicThreadID != NULL)
    {
      assert (!(this->state & Playing));
      SDL_WaitThread(this->musicThreadID, NULL);
      this->musicThreadID = NULL;
    }
    if (this->state & OggPlayer::SourceAllocated)
    {
      alSourceStop(this->source);
      alSourcei(this->source, AL_BUFFER, 0);
    }
  }

  /**
   * @brief updates the stream, this has to be done every few parts of a second, for sound-consistency
   * @returns true, if the Sound is playing flawlessly
   */
  bool OggPlayer::update()
  {
    int processed = 0;
    bool active = true;

    alGetSourcei(source, AL_BUFFERS_PROCESSED, &processed);
    if (DEBUG_LEVEL >= 3)
      SoundEngine::checkError("OggPlayer::update()::alGetSourceI", __LINE__);

    while(processed--)
    {
      ALuint buffer;

      alSourceUnqueueBuffers(source, 1, &buffer);
      if (DEBUG_LEVEL >= 3)
        SoundEngine::checkError("OggPlayer::update()::unqueue", __LINE__);

      active = stream(buffer);

      alSourceQueueBuffers(source, 1, &buffer);
      if (DEBUG_LEVEL >= 3)
        SoundEngine::checkError("OggPlayer::update()::queue", __LINE__);
    }

    return active;
  }

  /**
   * @brief gets a new Stream from buffer
   * @param buffer the buffer to get the stream from
   * @return true, if everything worked as planed
   */
  bool OggPlayer::stream(ALuint buffer)
  {
    if (unlikely(!(this->state & Playing)))
      return false;
    char pcm[OGG_PLAYER_BUFFER_SIZE];
    int  size = 0;
    int  section;
    int  result;

    while(size < OGG_PLAYER_BUFFER_SIZE)
    {
      result = ov_read(&this->oggStream, pcm + size, OGG_PLAYER_BUFFER_SIZE - size, 0, 2, 1, &section);

      if(result > 0)
        size += result;
      else if(result < 0)
        throw getVorbisError(result);
      else /* eof */
        ov_time_seek(&this->oggStream, 0.0);
    }

    if(size == 0)
      return false;

    alBufferData(buffer, format, pcm, size, vorbisInfo->rate);
    if (DEBUG_LEVEL >= 3)
      SoundEngine::checkError("OggPlayer::stream()::BUFFER", __LINE__);

    return true;
  }


  /**
   * @brief releases a stream
   */
  void OggPlayer::release()
  {
    if (this->state & OggPlayer::SourceAllocated)
    {
      assert(alIsSource(this->source));
      if (this->state & OggPlayer::Playing);
      {
        // Kill the Music Thread.
        this->state &= ~OggPlayer::Playing;
        this->suspend();

        SoundEngine::checkError("OggPlayer::release()::alSourceStop", __LINE__);
      }
      empty();
      alSourcei(this->source, AL_BUFFER, 0);
      SoundEngine::getInstance()->pushALSource(this->source);
      this->source = 0;
      this->state &= ~SourceAllocated;
    }
    if (this->state & OggPlayer::BuffersAllocated)
    {
      assert (this->buffers[0] != 0 && this->buffers[1] != 0);
      alDeleteBuffers(2, buffers);
      SoundEngine::checkError("OggPlayer::release()::alDeleteBuffers", __LINE__);
      this->buffers[0] = 0;
      this->buffers[1] = 0;
      this->state &= ~OggPlayer::BuffersAllocated;
    }

    if (this->state & OggPlayer::FileOpened)
    {
      ov_clear(&oggStream);
      this->state &= ~OggPlayer::FileOpened;
    }

  }


  /**
   * @brief empties the buffers
   */
  void OggPlayer::empty()
  {
    int queued;

    alGetSourcei(source, AL_BUFFERS_QUEUED, &queued);

    while(queued--)
    {
      ALuint buffer;

      alSourceUnqueueBuffers(source, 1, &buffer);
      SoundEngine::checkError("OggPlayer::empty()::unqueue Buffers", __LINE__);
    }
  }


  /////////////////////
  // DEBUG_LEVEL FUNCTIONS //
  /////////////////////
  /**
   * displays some info about the ogg-file
   */
  void OggPlayer::debug() const
  {
    std::cout
    << "version         " << vorbisInfo->version         << "\n"
    << "channels        " << vorbisInfo->channels        << "\n"
    << "rate (hz)       " << vorbisInfo->rate            << "\n"
    << "bitrate upper   " << vorbisInfo->bitrate_upper   << "\n"
    << "bitrate nominal " << vorbisInfo->bitrate_nominal << "\n"
    << "bitrate lower   " << vorbisInfo->bitrate_lower   << "\n"
    << "bitrate window  " << vorbisInfo->bitrate_window  << "\n"
    << "\n"
    << "vendor " << vorbisComment->vendor << "\n";

    for(int i = 0; i < vorbisComment->comments; i++)
      std::cout << "   " << vorbisComment->user_comments[i] << "\n";

    std::cout << std::endl;
  }


  void OggPlayer::printState() const
  {
    PRINTF(0)("OggPlayer is in the following States: ");
    if (this->state & OggPlayer::FileOpened)
      PRINT(0)("FileOpened ");
    if (this->state & OggPlayer::SourceAllocated)
      PRINT(0)("SourceAllocated ");
    if (this->state & OggPlayer::BuffersAllocated)
      PRINT(0)("BuffersAllocated ");
    if (this->state & OggPlayer::Stopped)
      PRINT(0)("Stopped ");
    if (this->state & OggPlayer::Playing)
      PRINT(0)("Playing ");
    if (this->state & OggPlayer::Paused)
      PRINT(0)("Paused ");
    if (this->state & OggPlayer::Error)
      PRINT(0)("Error ");
    PRINT(0)("\n");
  }

  /**
   * returns errors
   * @param code the error-code
   * @return the error as a String
   */
  const char* OggPlayer::getVorbisError(int code)
  {
    switch(code)
    {
    case OV_EREAD:
      return ("Read from media.");
    case OV_ENOTVORBIS:
      return ("Not Vorbis data.");
    case OV_EVERSION:
      return ("Vorbis version mismatch.");
    case OV_EBADHEADER:
      return ("Invalid Vorbis header.");
    case OV_EFAULT:
      return ("Internal logic fault (bug or heap/stack corruption.");
    default:
      return ("Unknown Ogg error.");
    }
  }

}