using System.Collections.Generic;
using System.IO;

namespace ADOFAIRenderer.Util.Audio.Clip;

/// <summary>
/// File path of every external audio clip the game loads, keyed by the game's audioLib key.
///
/// The game loads external clips with AudioManager.FindOrLoadAudioClipExternal(path, ...) and stores them in audioLib under
/// Path.GetFileName(path) + "*external" (the same string becomes AudioClip.name). Recorded paths:
/// - Song: Path.Combine(Path.GetDirectoryName(levelPath), levelData.songFilename) (scnGame song loading).
/// - PlaySound event sound: Path.Combine(Path.GetDirectoryName(levelPath), hitsound) (scnGame.LoadSoundCo);
///   ffxPlaySound plays it as hitsound + "*external".
/// <see cref="Record"/> is called only when the game actually loads the file (the key is not in audioLib yet),
/// so the recorded path is the file of the clip audioLib holds under that key.
/// Thread-safe.
/// </summary>
internal static class AudioClipPaths
{
    /// <summary>Suffix of the game's audioLib keys for external clips.</summary>
    public const string ExternalSuffix = "*external";

    /// <summary>File path by audioLib key; also the lock object. Entries are kept for the whole game session.</summary>
    private static readonly Dictionary<string, string> Paths = new();

    /// <summary>audioLib key of an external clip loaded from <paramref name="path"/>.</summary>
    public static string KeyOf(string path) => Path.GetFileName(path) + ExternalSuffix;

    /// <summary>Records <paramref name="path"/> under <see cref="KeyOf"/>(path), replacing an earlier path of the same key.</summary>
    public static void Record(string path)
    {
        if (string.IsNullOrEmpty(path)) return;
        lock (Paths)
        {
            Paths[KeyOf(path)] = path;
        }
    }

    /// <summary>Recorded path for an audioLib key (or AudioClip.name) of an external clip.</summary>
    public static bool TryGetPath(string key, out string path)
    {
        lock (Paths)
        {
            return Paths.TryGetValue(key, out path!);
        }
    }
}