/// <summary>
/// An RPG projectile. It supports either being fired in a set direction, or continuously updated with an end target.
/// </summary>
public sealed partial class RpgProjectile : ProjectileEntity
{
	[Property] public SoundEvent LoopingSound { get; set; }
	[Property] public float ExplosionRadius { get; set; } = 256f;
	[Property] public float ExplosionDamage { get; set; } = 150f;
	[Property] public float ExplosionForce { get; set; } = 1.5f;

	SoundHandle LoopingSoundHandle;

	protected override void OnEnabled()
	{
		base.OnEnabled();

		if ( LoopingSound.IsValid() )
		{
			LoopingSoundHandle = Sound.Play( LoopingSound, WorldPosition );
		}

		if ( IsProxy )
			return;

		Rigidbody.Gravity = false;
	}

	protected override void OnDisabled()
	{
		LoopingSoundHandle?.Stop();
	}

	protected override void OnUpdate()
	{
		LoopingSoundHandle?.Position = WorldPosition;
	}

	protected override void OnHit( Collision collision = default )
	{
		Explode();
	}

	void Explode()
	{
		var explosionPrefab = ResourceLibrary.Get<PrefabFile>( "/prefabs/engine/explosion_med.prefab" );
		if ( explosionPrefab == null )
		{
			Log.Warning( "RpgProjectile: Can't find /prefabs/engine/explosion_med.prefab" );
			GameObject.Destroy();
			return;
		}

		var go = GameObject.Clone( explosionPrefab, new CloneConfig { Transform = WorldTransform.WithScale( 1 ), StartEnabled = false } );
		if ( go.IsValid() )
		{
			go.RunEvent<RadiusDamage>( x =>
			{
				x.Radius = ExplosionRadius;
				x.PhysicsForceScale = ExplosionForce;
				x.DamageAmount = ExplosionDamage;
				x.Attacker = Instigator.GameObject;
				x.DamageTags ??= new();
				x.DamageTags.Add( DamageTags.Explosion );
			}, FindMode.EverythingInSelfAndDescendants );

			go.Enabled = true;
			go.NetworkSpawn( true, null );
		}

		GameObject.Destroy();
	}

	/// <summary>
	/// This is meant to be called continuously, updates the target, rotates slowly to it and moves at a set speed.
	/// </summary>
	/// <param name="target"></param>
	/// <param name="speed"></param>
	[Rpc.Host]
	internal void UpdateWithTarget( Vector3 target, float speed )
	{
		var direction = (target - WorldPosition).Normal;
		var targetRotation = Rotation.LookAt( direction, Vector3.Up );

		WorldRotation = Rotation.Slerp( WorldRotation, targetRotation, Time.Delta * 6f );
		Rigidbody.Velocity = WorldTransform.Forward * (speed * 2f);
	}
}