using Godot;

public partial class SettingsManager : Node
{
    public override void _EnterTree()
    {
        if (Instance != null && Instance != this)
        {
            QueueFree();
            return;
        }

        Instance = this;
    }

    public override void _Ready()
    {
        LoadSettings();
        ApplyVolumes();
    }

    private void LoadSettings()
    {
        var config = new ConfigFile();
        var err = config.Load(c_ConfigPath);

        if (err == Error.Ok)
        {
            MasterVolumeDb = (float)config.GetValue(c_SectionAudio, "master_db", c_DefaultMasterVolume);
            MusicVolumeDb = (float)config.GetValue(c_SectionAudio, "music_db", c_DefaultMusicVolume);
            SfxVolumeDb = (float)config.GetValue(c_SectionAudio, "sfx_db", c_DefaultSfxVolume);
            GameSpeed = (float)config.GetValue(c_SectionGame, "speed", c_DefaultGameSpeed);
        }
        else
        {
            MasterVolumeDb = c_DefaultMasterVolume;
            MusicVolumeDb = c_DefaultMusicVolume;
            SfxVolumeDb = c_DefaultSfxVolume;
            GameSpeed = c_DefaultGameSpeed;
            SaveSettings();
        }
    }

    private void SaveSettings()
    {
        var config = new ConfigFile();

        config.SetValue(c_SectionAudio, "master_db", MasterVolumeDb);
        config.SetValue(c_SectionAudio, "music_db", MusicVolumeDb);
        config.SetValue(c_SectionAudio, "sfx_db", SfxVolumeDb);
        config.SetValue(c_SectionGame, "speed", GameSpeed);

        config.Save(c_ConfigPath);
    }

    public void SetMasterVolume(float db)
    {
        MasterVolumeDb = db;
        ApplyVolumes();
        SaveSettings();
    }

    public void SetMusicVolume(float db)
    {
        MusicVolumeDb = db;
        ApplyVolumes();
        SaveSettings();
    }

    public void SetSfxVolume(float db)
    {
        SfxVolumeDb = db;
        ApplyVolumes();
        SaveSettings();
    }

    public void SetGameSpeed(float gameSpeed)
    {
        GameSpeed = gameSpeed;
        SaveSettings();
    }

    private void ApplyVolumes()
    {
        var masterBus = AudioServer.GetBusIndex("Master");
        var musicBus = AudioServer.GetBusIndex("Music");
        var sfxBus = AudioServer.GetBusIndex("Sfx");

        if (masterBus != -1)
            AudioServer.SetBusVolumeDb(masterBus, MasterVolumeDb);

        if (musicBus != -1)
            AudioServer.SetBusVolumeDb(musicBus, MusicVolumeDb);

        if (sfxBus != -1)
            AudioServer.SetBusVolumeDb(sfxBus, SfxVolumeDb);
    }

    public static SettingsManager Instance { get; private set; }

    public float MasterVolumeDb { get; private set; }

    public float MusicVolumeDb { get; private set; }

    public float SfxVolumeDb { get; private set; }

    public float GameSpeed { get; private set; }

    private const float c_DefaultMusicVolume = -16.0f;
    private const float c_DefaultSfxVolume = 0.0f;
    private const float c_DefaultMasterVolume = 0.0f;
    private const float c_DefaultGameSpeed = 1.0f;

    private const string c_ConfigPath = "user://settings.cfg";
    private const string c_SectionAudio = "audio";
    private const string c_SectionGame = "game";
}