#include "core/audio/audio.hpp"

#include <SDL3/SDL.h>  // Para SDL_GetError, SDL_Init

#include <algorithm>  // Para clamp
#include <iostream>   // Para std::cout

// Implementación de stb_vorbis (debe estar ANTES de incluir jail_audio.hpp).
// clang-format off
#undef STB_VORBIS_HEADER_ONLY
#include "external/stb_vorbis.c"
// stb_vorbis.c filtra les macros L, C i R (i PLAYBACK_*) al TU. Les netegem
// perquè xocarien amb noms de paràmetres de plantilla en altres headers.
#undef L
#undef C
#undef R
#undef PLAYBACK_MONO
#undef PLAYBACK_LEFT
#undef PLAYBACK_RIGHT
// clang-format on

#include "core/audio/audio_adapter.hpp"  // Para AudioResource::getMusic/getSound
#include "core/audio/jail_audio.hpp"     // Para JA_*
#include "game/options.hpp"              // Para Options::audio

// Singleton
std::unique_ptr<Audio> Audio::instance;

// Inicializa la instancia única del singleton
void Audio::init() { Audio::instance = std::unique_ptr<Audio>(new Audio()); }

// Libera la instancia
void Audio::destroy() { Audio::instance.reset(); }

// Obtiene la instancia
auto Audio::get() -> Audio* { return Audio::instance.get(); }

// Constructor
Audio::Audio() { initSDLAudio(); }

// Destructor
Audio::~Audio() {
    JA_Quit();
}

// Método principal
void Audio::update() {
    JA_Update();

    // Sincronizar estado: detectar cuando la música se para (ej. fade-out completado)
    if (instance && instance->music_.state == MusicState::PLAYING && JA_GetMusicState() != JA_MUSIC_PLAYING) {
        instance->music_.state = MusicState::STOPPED;
    }
}

// Reproduce la música por nombre (con crossfade opcional)
void Audio::playMusic(const std::string& name, const int loop, const int crossfade_ms) {
    bool new_loop = (loop != 0);

    // Si ya está sonando exactamente la misma pista y mismo modo loop, no hacemos nada
    if (music_.state == MusicState::PLAYING && music_.name == name && music_.loop == new_loop) {
        return;
    }

    if (!music_enabled_) return;

    auto* resource = AudioResource::getMusic(name);
    if (resource == nullptr) return;

    if (crossfade_ms > 0 && music_.state == MusicState::PLAYING) {
        JA_CrossfadeMusic(resource, crossfade_ms, loop);
    } else {
        if (music_.state == MusicState::PLAYING) {
            JA_StopMusic();
        }
        JA_PlayMusic(resource, loop);
    }

    music_.name = name;
    music_.loop = new_loop;
    music_.state = MusicState::PLAYING;
}

// Reproduce la música por puntero (con crossfade opcional)
void Audio::playMusic(JA_Music_t* music, const int loop, const int crossfade_ms) {
    if (!music_enabled_ || music == nullptr) return;

    if (crossfade_ms > 0 && music_.state == MusicState::PLAYING) {
        JA_CrossfadeMusic(music, crossfade_ms, loop);
    } else {
        if (music_.state == MusicState::PLAYING) {
            JA_StopMusic();
        }
        JA_PlayMusic(music, loop);
    }

    music_.name.clear();  // nom desconegut quan es passa per punter
    music_.loop = (loop != 0);
    music_.state = MusicState::PLAYING;
}

// Pausa la música
void Audio::pauseMusic() {
    if (music_enabled_ && music_.state == MusicState::PLAYING) {
        JA_PauseMusic();
        music_.state = MusicState::PAUSED;
    }
}

// Continua la música pausada
void Audio::resumeMusic() {
    if (music_enabled_ && music_.state == MusicState::PAUSED) {
        JA_ResumeMusic();
        music_.state = MusicState::PLAYING;
    }
}

// Detiene la música
void Audio::stopMusic() {
    if (music_enabled_) {
        JA_StopMusic();
        music_.state = MusicState::STOPPED;
    }
}

// Reproduce un sonido por nombre
void Audio::playSound(const std::string& name, Group group) const {
    if (sound_enabled_) {
        JA_PlaySound(AudioResource::getSound(name), 0, static_cast<int>(group));
    }
}

// Reproduce un sonido por puntero directo
void Audio::playSound(JA_Sound_t* sound, Group group) const {
    if (sound_enabled_ && sound != nullptr) {
        JA_PlaySound(sound, 0, static_cast<int>(group));
    }
}

// Detiene todos los sonidos
void Audio::stopAllSounds() const {
    if (sound_enabled_) {
        JA_StopChannel(-1);
    }
}

// Realiza un fundido de salida de la música
void Audio::fadeOutMusic(int milliseconds) const {
    if (music_enabled_ && getRealMusicState() == MusicState::PLAYING) {
        JA_FadeOutMusic(milliseconds);
    }
}

// Consulta directamente el estado real de la música en jailaudio
auto Audio::getRealMusicState() -> MusicState {
    JA_Music_state ja_state = JA_GetMusicState();
    switch (ja_state) {
        case JA_MUSIC_PLAYING:
            return MusicState::PLAYING;
        case JA_MUSIC_PAUSED:
            return MusicState::PAUSED;
        case JA_MUSIC_STOPPED:
        case JA_MUSIC_INVALID:
        case JA_MUSIC_DISABLED:
        default:
            return MusicState::STOPPED;
    }
}

// Establece el volumen de los sonidos (float 0.0..1.0)
void Audio::setSoundVolume(float sound_volume, Group group) const {
    sound_volume = std::clamp(sound_volume, MIN_VOLUME, MAX_VOLUME);
    const bool active = enabled_ && sound_enabled_;
    const float CONVERTED_VOLUME = active ? sound_volume * Options::audio.volume : 0.0F;
    JA_SetSoundVolume(CONVERTED_VOLUME, static_cast<int>(group));
}

// Establece el volumen de la música (float 0.0..1.0)
void Audio::setMusicVolume(float music_volume) const {
    music_volume = std::clamp(music_volume, MIN_VOLUME, MAX_VOLUME);
    const bool active = enabled_ && music_enabled_;
    const float CONVERTED_VOLUME = active ? music_volume * Options::audio.volume : 0.0F;
    JA_SetMusicVolume(CONVERTED_VOLUME);
}

// Aplica la configuración
void Audio::applySettings() {
    enable(Options::audio.enabled);
}

// Establecer estado general
void Audio::enable(bool value) {
    enabled_ = value;

    setSoundVolume(enabled_ ? Options::audio.sound.volume : MIN_VOLUME);
    setMusicVolume(enabled_ ? Options::audio.music.volume : MIN_VOLUME);
}

// Inicializa SDL Audio
void Audio::initSDLAudio() {
    if (!SDL_Init(SDL_INIT_AUDIO)) {
        std::cout << "SDL_AUDIO could not initialize! SDL Error: " << SDL_GetError() << '\n';
    } else {
        JA_Init(FREQUENCY, SDL_AUDIO_S16LE, 2);
        enable(Options::audio.enabled);
    }
}