namespace BaseGames.Core.Events
{
    /// <summary>
    /// 游戏状态 ID（值类型，替代旧版 GameState 枚举）。
    /// 具体实例由 GameStates 静态工厂创建。
    /// </summary>
    public readonly struct GameStateId : System.IEquatable<GameStateId>
    {
        public readonly string Id;

        public GameStateId(string id) => Id = id;

        public bool Equals(GameStateId other) => Id == other.Id;
        public override bool Equals(object obj) => obj is GameStateId g && Equals(g);
        public override int GetHashCode() => Id?.GetHashCode() ?? 0;
        public override string ToString() => Id ?? "<null>";

        public static bool operator ==(GameStateId a, GameStateId b) => a.Equals(b);
        public static bool operator !=(GameStateId a, GameStateId b) => !a.Equals(b);
    }
}