MovementTests/systems/dash/DashSystem.cs

using Godot;

namespace Movementtests.systems;

public partial class DashSystem: Node3D
{
    public record DashLocation(bool HasHit, Vector3 TargetLocation, Vector3 CollisionPoint, Vector3 CollisionNormal);
    
    
    [Export(PropertyHint.Range, "0,0.2,0.01,or_greater")]
    public float DashSpeed { get; set; } = 0.1f;
    [Export(PropertyHint.Range, "0,1000,1,or_greater")]
    public float PostDashSpeed { get; set; } = 0f;
    
    public bool HasHit { get; set; }
    public Vector3 TargetLocation { get; set; }
    public Vector3 CollisionPoint { get; set; }
    public Vector3 CollisionNormal { get; set; }
    public Vector3 PlannedLocation { get; set; }
    
    public bool ShouldMantle { get; set; }
    public Vector3 PlannedMantleLocation { get; set; }
        
    private Node3D _head;
    private ShapeCast3D _dashCast3D;
    private ShapeCast3D _playerCast3D;
    private Camera3D _camera;
    private TweenQueueSystem _tweenQueueSystem;
    private Vector3 _dashDirection = Vector3.Zero;

    private MantleSystem _mantleSystem;
    private MeshInstance3D _dashTarget;
    private CpuParticles3D _dashIndicator;
    private AnimationPlayer _dashIndicatorAnim;
    
    [Export]
    public PackedScene DashIndicatorScene { get; set; }

    [Signal]
    public delegate void DashStartedEventHandler();
    [Signal]
    public delegate void DashEndedEventHandler();
    [Signal]
    public delegate void DashProgressEventHandler(float progress);
    
    private Vector3 _globalDashPosition = Vector3.Zero;

    private float _playerHeight;
    private float _playerRadius;
    
    public float DashCastRadius { get; set; }

    public void Init(Node3D head, Camera3D camera, TweenQueueSystem tweenQueueSystem)
    {
        _dashCast3D = GetNode<ShapeCast3D>("DashCast3D");
        var dashShape = _dashCast3D.GetShape() as SphereShape3D;
        DashCastRadius = dashShape!.Radius;
        
        _playerCast3D = GetNode<ShapeCast3D>("PlayerShapeCast3D");
        var playerShape = _playerCast3D.GetShape() as CapsuleShape3D;
        _playerHeight = playerShape!.Height;
        _playerRadius = playerShape!.Radius;
        
        _head = head;
        _camera = camera;
        _tweenQueueSystem = tweenQueueSystem;
        
        _mantleSystem = GetNode<MantleSystem>("MantleSystem");
        _mantleSystem.Init(this);
        
        _dashTarget = GetNode<MeshInstance3D>("DashTarget");
        _dashTarget.SetVisible(false);
        _dashIndicator = GetNode<CpuParticles3D>("DashIndicator");
        _dashIndicatorAnim = GetNode<AnimationPlayer>("DashIndicator/AnimationPlayer");
    }

    private Vector3 RecurseThroughCollisions(Vector3 previousCollisionPoint, Vector3 previousNormal, int recursionDepth)
    {
        if (recursionDepth == 0)
            return previousCollisionPoint;
        
        var startPoint = previousCollisionPoint + previousNormal*_playerHeight;
        _playerCast3D.SetGlobalPosition(startPoint);
        _playerCast3D.SetTargetPosition(-previousNormal*_playerRadius);
        
        var hasHit = _playerCast3D.IsColliding();
        if (!hasHit)
            return previousCollisionPoint;
        
        return RecurseThroughCollisions(
            _playerCast3D.GetCollisionPoint(0), 
            _playerCast3D.GetCollisionNormal(0),
            recursionDepth - 1);
    }

    private DashLocation ComputeDashLocation()
    {
        var targetLocation = _dashCast3D.ToGlobal(_dashCast3D.TargetPosition);
        var hasHit = _dashCast3D.IsColliding();
        if (!hasHit)
        {
            return new DashLocation(false, targetLocation, Vector3.Zero, Vector3.Zero);
        }

        var collisionPoint = _dashCast3D.GetCollisionPoint(0);
        var collisionNormal = _dashCast3D.GetCollisionNormal(0);
        
        var fraction = _dashCast3D.GetClosestCollisionSafeFraction();
        var globalSweepPath = targetLocation - _dashCast3D.GlobalPosition;
        var locationAlongPath = _dashCast3D.GlobalPosition + globalSweepPath * fraction;
        return new DashLocation(true, locationAlongPath, collisionPoint, collisionNormal);
        
        // // Pushes the point down when dashing to under a platform so head doesn't clip
        // var maxPushDownDistance = 0.9f;
        // var correctionProportion = (float) Mathf.Remap(CollisionNormal.Y, -0.5, -1, 0, 1);
        // var proportion = (float)Mathf.Remap(_dashCast3D.GlobalRotation.X, 0, 1.57, 0, 1);
        // var finalLocation = locationAlongPath
        //                     + CollisionNormal
        //                     * maxPushDownDistance
        //                     * Mathf.Clamp(proportion, 0, 1)
        //                     * Mathf.Clamp(correctionProportion, 0, 1);
        //
        // return new DashLocation(true, finalLocation);
    }

    public void PrepareDash()
    {
        _dashCast3D.SetRotation(new Vector3(
            _camera.Rotation.X,
            _head.Rotation.Y,
            _camera.Rotation.Z));

        (HasHit, PlannedLocation, CollisionPoint, CollisionNormal) = ComputeDashLocation();

        
        ShouldMantle = false;
        // var mantleLocation = Vector3.Zero;
        // if (HasHit && Mathf.Abs(CollisionNormal.Y) < 0.5f)
        // {
        //     var mantleResult = _mantleSystem.FindMantleLocationAtPoint(PlannedLocation, CollisionNormal);
        //     ShouldMantle = mantleResult.IsSome(out mantleLocation);
        // }
        // PlannedMantleLocation = mantleLocation;
        
        // Setup dash target
        var targetColor = HasHit ? new Color(1f, 0.2f, 0.2f) : new Color(1f, 1f, 1f);
        targetColor = ShouldMantle ? new Color(0.2f, 0.2f, 1f) : targetColor;
        var targetMaterial = (StandardMaterial3D) _dashTarget.GetSurfaceOverrideMaterial(0);
        targetMaterial.SetAlbedo(targetColor);
        _dashTarget.SetVisible(true);
        _dashTarget.SetGlobalPosition(PlannedLocation);
    }

    public void StopPreparingDash()
    {
        _dashTarget.SetVisible(false);
    }

    public void StartPreparingDash()
    {
        _dashTarget.SetVisible(true);
    }
}