using Sandbox.Movement;

public sealed partial class Player
{
	[Property, Group( "Camera" )] public float SeatedCameraDistance { get; set; } = 200f;
	[Property, Group( "Camera" )] public float SeatedCameraHeight { get; set; } = 40f;
	[Property, Group( "Camera" )] public float SeatedCameraPositionSpeed { get; set; } = 3f;
	[Property, Group( "Camera" )] public float SeatedCameraVelocityScale { get; set; } = 0.1f;

	private ISitTarget _cachedSeat;
	private bool _seatCameraInitialized;
	private float _minCameraDistance;
	private float _smoothedDistance;
	private Angles _seatedAngles;
	private Vector3 _lastSeatWorldPos;
	private List<BaseCarryable> _seatedWeapons;

	private float roll;

	void PlayerController.IEvents.OnEyeAngles( ref Angles ang )
	{
		var angles = ang;
		Local.IPlayerEvents.Post( x => x.OnCameraMove( ref angles ) );
		ang = angles;
	}

	void PlayerController.IEvents.PostCameraSetup( CameraComponent camera )
	{
		camera.FovAxis = CameraComponent.Axis.Vertical;
		camera.FieldOfView = Screen.CreateVerticalFieldOfView( Preferences.FieldOfView, 9.0f / 16.0f );

		if ( Controller.ThirdPerson )
			camera.RenderExcludeTags.Add( "firstperson" );
		else
			camera.RenderExcludeTags.Remove( "firstperson" );

		Local.IPlayerEvents.Post( x => x.OnCameraSetup( camera ) );

		ApplyMovementCameraEffects( camera );
		UpdateSeatedWeapons();
		//ApplySeatedCameraSetup( camera );
		DrawSeatedWeaponHud();

		Local.IPlayerEvents.Post( x => x.OnCameraPostSetup( camera ) );
	}

	private void ApplyMovementCameraEffects( CameraComponent camera )
	{
		if ( Controller.ThirdPerson ) return;
		if ( !GamePreferences.ViewBobbing ) return;

		var r = Controller.WishVelocity.Dot( EyeTransform.Left ) / -250.0f;
		roll = MathX.Lerp( roll, r, Time.Delta * 10.0f, true );

		camera.WorldRotation *= new Angles( 0, 0, roll );
	}

	private void UpdateSeatedWeapons()
	{
		var seat = GetComponentInParent<ISitTarget>( false );
		if ( seat is null )
		{
			_cachedSeat = null;
			_seatedWeapons = null;
			return;
		}

		if ( seat != _cachedSeat )
		{
			_cachedSeat = seat;
			_seatCameraInitialized = false;
		}
	}

	private void DrawSeatedWeaponHud()
	{
		if ( _seatedWeapons == null || _seatedWeapons.Count == 0 ) return;
		if ( Scene.Camera is null ) return;
		if ( Scene.Camera.RenderExcludeTags.Has( "ui" ) ) return;

		var hud = Scene.Camera.Hud;

		foreach ( var weapon in _seatedWeapons )
		{
			if ( !weapon.IsValid() ) continue;
			if ( weapon is IPlayerControllable controllable && !controllable.CanControl( this ) ) continue;

			Vector2 aimPos;

			if ( weapon.IsTargetedAim )
			{
				aimPos = Screen.Size * 0.5f;
			}
			else
			{
				var muzzle = weapon.MuzzleTransform.WorldTransform;
				var tr = Scene.Trace.Ray( muzzle.Position, muzzle.Position + muzzle.Rotation.Forward * 4096f )
					.IgnoreGameObjectHierarchy( weapon.GameObject.Root )
					.Run();

				aimPos = Scene.Camera.PointToScreenPixels( tr.EndPosition );
			}

			weapon.DrawHud( hud, aimPos );
		}
	}
}