using Machines.Player;

namespace Machines.Events;

/// <summary>
/// What a car impact was against.
/// </summary>
public enum CarImpactKind
{
	/// <summary>
	/// Hit static world geometry.
	/// </summary>
	Wall,
	/// <summary>
	/// The car hit another car.
	/// </summary>
	Car,
	/// <summary>
	/// Hit a pushable prop (non-blocking, but registers for shake/haptics).
	/// </summary>
	Prop
}

/// <summary>
/// Details of a single car impact
/// </summary>
public readonly struct CarImpact
{
	/// <summary>
	/// What was hit.
	/// </summary>
	public CarImpactKind Kind { get; init; }

	/// <summary>
	/// The car this impact is about.
	/// </summary>
	public Car Car { get; init; }

	/// <summary>
	/// The other car when <see cref="Kind"/> is <see cref="CarImpactKind.Car"/>, null otherwise.
	/// </summary>
	public Car OtherCar { get; init; }

	/// <summary>
	/// GameObject that was hit (wall, prop, or other car).
	/// </summary>
	public GameObject Other { get; init; }

	/// <summary>
	/// Contact point in world space.
	/// </summary>
	public Vector3 Point { get; init; }

	/// <summary>
	/// Contact surface normal.
	/// </summary>
	public Vector3 Normal { get; init; }

	/// <summary>
	/// Closing/relative speed at impact.
	/// </summary>
	public float Speed { get; init; }
}

/// <summary>
/// Fired once per discrete car impact (wall, car, or prop).
/// </summary>
public interface ICarImpactListener : ISceneEvent<ICarImpactListener>
{
	void OnCarImpact( CarImpact impact );
}