using System.Text.Json;

namespace VoiceCat.App.Models;

/// <summary>
/// User's send-side voice input preferences — transmission mode, VAD sensitivity, mic input
/// gain, and the push-to-talk key. Persisted to %AppData%\VoiceCat\voice.json, same pattern as
/// <see cref="ServerListStore"/> and FeedbackSettings: a missing or corrupt file yields defaults
/// rather than throwing. Slider-position values are stored as-is so MainForm can restore the
/// TrackBars directly.
/// </summary>
public sealed class VoiceSettings
{
    /// <summary>Transmission mode: 0 = voice activation, 1 = push-to-talk, 2 = always on
    /// (matches Interop's VcInputMode).</summary>
    public int InputMode { get; set; } = 0;

    /// <summary>VAD sensitivity slider position, 1–100 (default mirrors the designer's 76).</summary>
    public int VadThresholdSlider { get; set; } = 76;

    /// <summary>Microphone input gain slider position, 0–300 percent (100 = unity).</summary>
    public int MicGain { get; set; } = 100;

    /// <summary>Send-side mic noise reduction (RNNoise) toggle. MIC stream only, mono only;
    /// denoises captured mic PCM before input gain and VAD/PTT gate so everyone hears the
    /// cleaned signal. Independent of the per-listener receive-side NR.</summary>
    public bool MicNoiseReduction { get; set; } = false;

    /// <summary>Capture the mic in stereo (interleaved L/R) instead of mono. Off by default. Real
    /// stereo only reaches the wire on a stereo channel; on a mono channel the core folds the mic
    /// to mono. Applied when the capture device next starts (Join Voice or an audio restart).</summary>
    public bool StereoMic { get; set; } = false;

    /// <summary>Push-to-talk key, stored as the integer value of System.Windows.Forms.Keys.</summary>
    public int PttKey { get; set; } = (int)Keys.F8;

    /// <summary>Saved device ID from the last session; null means use the system default.</summary>
    public string? InputDeviceId { get; set; } = null;

    /// <summary>Whether the secondary "aux" outgoing stream is enabled. The aux stream is a
    /// second hardware input device the client captures itself and feeds to the core via
    /// vc_stream_feed_pcm (kind = AUX_DEVICE, external_feed). Lets a user transmit e.g. mic +
    /// a line-in at once.</summary>
    public bool AuxEnabled { get; set; } = false;

    /// <summary>WASAPI endpoint id of the aux capture device; null = system default capture
    /// device. NOTE: this is a WASAPI device id (from <see cref="Audio.InputDeviceEnumerator"/>),
    /// NOT a core/miniaudio id — the aux device is opened client-side, so the two id spaces differ.</summary>
    public string? AuxDeviceId { get; set; } = null;

    /// <summary>Aux input volume slider position, 0–300 percent (100 = unity). Applied client-side
    /// to the captured PCM before feeding (the core's input gain is mic-only and global).</summary>
    public int AuxGain { get; set; } = 100;

    private static readonly JsonSerializerOptions JsonOptions = new() { WriteIndented = true };

    private static string AppDataDir => Path.Combine(
        Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "VoiceCat");

    private static string FilePath => Path.Combine(AppDataDir, "voice.json");

    public static VoiceSettings Load()
    {
        try
        {
            if (!File.Exists(FilePath)) return new VoiceSettings();
            string json = File.ReadAllText(FilePath);
            return JsonSerializer.Deserialize<VoiceSettings>(json) ?? new VoiceSettings();
        }
        catch
        {
            return new VoiceSettings();
        }
    }

    public void Save()
    {
        Directory.CreateDirectory(AppDataDir);
        File.WriteAllText(FilePath, JsonSerializer.Serialize(this, JsonOptions));
    }
}