#ifndef MIXER_H_6DF82000
#define MIXER_H_6DF82000

#include <SDL_mixer.h>
#include <cmath>
#include <memory>
#include <stdexcept>
#include <map>
#include <string>

class mix_error : public std::logic_error {
public:

  mix_error() : std::logic_error(Mix_GetError())
  {
  }
};

class mix_wrapper {
public:

  mix_wrapper()
  {
    if (Mix_Init(0) != 0) {
      mix_error ex;
      Mix_Quit();

    	throw ex;
    }

    if (Mix_OpenAudio(MIX_DEFAULT_FREQUENCY, MIX_DEFAULT_FORMAT, 2, 1024) != 0) {
      mix_error ex;
      Mix_Quit();

    	throw ex;
    }
  }

  ~mix_wrapper()
  {
    Mix_CloseAudio();
    Mix_Quit();
  }
};

class chunk_deleter {
public:

  void operator()(Mix_Chunk* chunk) {
    Mix_FreeChunk(chunk);
  }
};

using chunk_ptr = std::unique_ptr<Mix_Chunk, chunk_deleter>;

class music_deleter {
public:

  void operator()(Mix_Music* music) {
    Mix_FreeMusic(music);
  }
};

using music_ptr = std::unique_ptr<Mix_Music, music_deleter>;

// MUST create the Renderer first!
class Mixer {
public:

  void playSound(std::string_view filename);

  int loopSound(std::string_view filename);

  void stopChannel(int channel);

  void pauseSounds();

  void unpauseSounds();

  int getSoundVolume() const { return std::round(static_cast<double>(soundVolume_) / MIX_MAX_VOLUME * 10); }

  void setSoundVolume(int vol);

  // name is the name of the file, not containing the extension
  // ms is the time in milliseconds to fade in
  void playMusic(std::string_view name, int ms = 0);

  bool isPlayingMusic() const { return !playingTrack_.empty(); }

  const std::string& getPlayingTrack() const { return playingTrack_; }

  void fadeoutMusic(int ms);

  void muteMusic();

  void unmuteMusic();

  bool isMusicMuted() const { return musicMuted_; }

  int getMusicVolume() const { return std::round(static_cast<double>(musicVolume_) / MIX_MAX_VOLUME * 10); }

  void setMusicVolume(int vol);

  void pauseMusic();

  void unpauseMusic();

private:

  Mix_Chunk* getChunkByFilename(std::string filename);

  Mix_Music* getMusicByName(std::string_view name);

  mix_wrapper mix_;
  std::map<std::string, chunk_ptr> sounds_;
  std::map<std::string, music_ptr> music_;
  std::string playingTrack_;
  int musicVolume_ = MIX_MAX_VOLUME;
  bool musicMuted_ = false;
  int soundVolume_ = MIX_MAX_VOLUME;
};

#endif /* end of include guard: MIXER_H_6DF82000 */