/// <summary>
/// Base class for a high-level game mode handled by <see cref="GameModeManager"/>.
/// Modes are plain C# classes (not MonoBehaviours); Enter/Exit/Tick are driven
/// manually by the manager. Derive from this and register an instance in
/// GameModeManager.BuildModes().
/// </summary>
public abstract class GameMode
{
    protected GameModeManager Manager { get; private set; }

    /// <summary>Human-readable name (shown in logs).</summary>
    public abstract string DisplayName { get; }

    internal void Bind(GameModeManager manager) => Manager = manager;

    /// <summary>Called once when this mode becomes active.</summary>
    public virtual void Enter() { }

    /// <summary>Called once when this mode stops being active.</summary>
    public virtual void Exit() { }

    /// <summary>Called every frame while this mode is active.</summary>
    public virtual void Tick() { }
}