//  SPDX-License-Identifier: MIT
//
//  ES-DE
//  Sound.cpp
//
//  Higher-level audio functions.
//  Navigation sounds, audio sample playback etc.
//

#include "Sound.h"

#include "AudioManager.h"
#include "Log.h"
#include "Settings.h"
#include "ThemeData.h"
#include "resources/ResourceManager.h"

std::shared_ptr<Sound> Sound::get(const std::string& path)
{
    auto it = sMap.find(path);
    if (it != sMap.cend())
        return it->second;

    std::shared_ptr<Sound> sound {std::shared_ptr<Sound>(new Sound(path))};
    AudioManager::getInstance().registerSound(sound);
    sMap[path] = sound;
    return sound;
}

std::shared_ptr<Sound> Sound::getFromTheme(ThemeData* const theme,
                                           const std::string& view,
                                           const std::string& element)
{
    std::string elemName {element.substr(6, std::string::npos)};

    if (theme == nullptr) {
        LOG(LogDebug) << "Sound::getFromTheme(): Using fallback sound file for \"" << elemName
                      << "\"";
        return get(ResourceManager::getInstance().getResourcePath(":/sounds/" + elemName + ".wav"));
    }

    LOG(LogDebug) << "Sound::getFromTheme(): Looking for tag <sound name=\"" << elemName << "\">";

    const ThemeData::ThemeElement* elem {theme->getElement(view, element, "sound")};
    if (!elem || !elem->has("path")) {
        LOG(LogDebug) << "Sound::getFromTheme(): Tag not found, using fallback sound file";
        return get(ResourceManager::getInstance().getResourcePath(":/sounds/" + elemName + ".wav"));
    }

    if (!Utils::FileSystem::exists(elem->get<std::string>("path"))) {
        LOG(LogError) << "Sound::getFromTheme(): Navigation sound tag found but sound file does "
                         "not exist, falling back to default sound";
        return get(ResourceManager::getInstance().getResourcePath(":/sounds/" + elemName + ".wav"));
    }

    LOG(LogDebug) << "Sound::getFromTheme(): Tag found, ready to load theme sound file";
    return get(elem->get<std::string>("path"));
}

Sound::Sound(const std::string& path)
    : mSampleData(nullptr)
    , mSamplePos(0)
    , mSampleLength(0)
    , mPlaying(false)
{
    loadFile(path);
}

void Sound::loadFile(const std::string& path)
{
    mPath = path;
    init();
}

void Sound::init()
{
    if (mSampleData != nullptr)
        deinit();

    if (mPath.empty())
        return;

    // Load WAV file via SDL.
    SDL_AudioSpec wave;
    Uint8* data {nullptr};
    Uint32 dlen {0};
    if (SDL_LoadWAV(mPath.c_str(), &wave, &data, &dlen) == nullptr) {
        LOG(LogError) << "Failed to load theme navigation sound file: " << SDL_GetError();
        return;
    }

    // Convert sound file to the format required by ES-DE.
    SDL_AudioStream* conversionStream {
        SDL_NewAudioStream(wave.format, wave.channels, wave.freq, AudioManager::sAudioFormat.format,
                           AudioManager::sAudioFormat.channels, AudioManager::sAudioFormat.freq)};

    if (conversionStream == nullptr) {
        LOG(LogError) << "Failed to create sample conversion stream: " << SDL_GetError();
        return;
    }

    if (SDL_AudioStreamPut(conversionStream, data, dlen) == -1) {
        LOG(LogError) << "Failed to put samples in the conversion stream: " << SDL_GetError();
        SDL_FreeAudioStream(conversionStream);
        return;
    }

    int sampleLength {SDL_AudioStreamAvailable(conversionStream)};

    Uint8* converted {new Uint8[sampleLength]};
    if (SDL_AudioStreamGet(conversionStream, converted, sampleLength) == -1) {
        LOG(LogError) << "Failed to convert sound file '" << mPath << "': " << SDL_GetError();
        SDL_FreeAudioStream(conversionStream);
        delete[] converted;
        return;
    }

    mSampleData = converted;
    mSampleLength = sampleLength;
    mSamplePos = 0;
    mSampleFormat.freq = AudioManager::sAudioFormat.freq;
    mSampleFormat.channels = AudioManager::sAudioFormat.channels;
    mSampleFormat.format = AudioManager::sAudioFormat.format;
    SDL_FreeAudioStream(conversionStream);
    SDL_FreeWAV(data);
}

void Sound::deinit()
{
    mPlaying = false;

    if (mSampleData != nullptr) {
        SDL_LockAudioDevice(AudioManager::sAudioDevice);
        delete[] mSampleData;
        mSampleData = nullptr;
        mSampleLength = 0;
        mSamplePos = 0;
        SDL_UnlockAudioDevice(AudioManager::sAudioDevice);
        sMap.erase(mPath);
    }
}

void Sound::play()
{
    if (mSampleData == nullptr)
        return;

    if (!Settings::getInstance()->getBool("NavigationSounds"))
        return;

    if (!AudioManager::getInstance().getHasAudioDevice())
        return;

    SDL_LockAudioDevice(AudioManager::sAudioDevice);

    if (mPlaying)
        // Replay from start. rewind the sample to the beginning.
        mSamplePos = 0;
    else
        // Flag our sample as playing.
        mPlaying = true;

    SDL_UnlockAudioDevice(AudioManager::sAudioDevice);
    // Tell the AudioManager to start playing samples.
    AudioManager::getInstance().play();
}

void Sound::stop()
{
    // Flag our sample as not playing and rewind its position.
    SDL_LockAudioDevice(AudioManager::sAudioDevice);
    mPlaying = false;
    mSamplePos = 0;
    SDL_UnlockAudioDevice(AudioManager::sAudioDevice);
}

void Sound::setPosition(Uint32 newPosition)
{
    mSamplePos = newPosition;
    if (mSamplePos >= mSampleLength) {
        // Got to or beyond the end of the sample. stop playing.
        mPlaying = false;
        mSamplePos = 0;
    }
}

NavigationSounds& NavigationSounds::getInstance()
{
    static NavigationSounds instance;
    return instance;
}

void NavigationSounds::deinit()
{
    for (auto sound : mNavigationSounds) {
        AudioManager::getInstance().unregisterSound(sound);
        sound->deinit();
    }
    mNavigationSounds.clear();
}

void NavigationSounds::loadThemeNavigationSounds(ThemeData* const theme)
{
    if (theme) {
        LOG(LogDebug) << "NavigationSounds::loadThemeNavigationSounds(): "
                         "Theme includes navigation sound support, loading custom sounds";
    }
    else {
        LOG(LogDebug) << "NavigationSounds::loadThemeNavigationSounds(): "
                         "Theme does not include navigation sound support, using fallback sounds";
    }

    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "sound_systembrowse"));
    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "sound_quicksysselect"));
    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "sound_select"));
    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "sound_back"));
    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "sound_scroll"));
    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "sound_favorite"));
    mNavigationSounds.push_back(Sound::getFromTheme(theme, "all", "sound_launch"));
}

void NavigationSounds::playThemeNavigationSound(NavigationSoundsID soundID)
{
    NavigationSounds::getInstance().mNavigationSounds[soundID]->play();
}

bool NavigationSounds::isPlayingThemeNavigationSound(NavigationSoundsID soundID)
{
    return NavigationSounds::getInstance().mNavigationSounds[soundID]->isPlaying();
}