using Godot;

namespace Movementtests.systems;

public partial class DashSystem: Node3D
{
    [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 PlannedPlayerLocation { 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;

    public void Init(Node3D head, Camera3D camera, TweenQueueSystem tweenQueueSystem)
    {
        _dashCast3D = GetNode<ShapeCast3D>("DashCast3D");
        _playerCast3D = GetNode<ShapeCast3D>("PlayerShapeCast3D");
        
        _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 void ComputeDashLocation()
    {
        TargetLocation = _dashCast3D.ToGlobal(_dashCast3D.TargetPosition);
        HasHit = _dashCast3D.IsColliding();
        if (!HasHit)
        {
            PlannedPlayerLocation = TargetLocation;
            return;
        }
        
        CollisionPoint = _dashCast3D.GetCollisionPoint(0);
        CollisionNormal = _dashCast3D.GetCollisionNormal(0);
        
        var fraction = _dashCast3D.GetClosestCollisionSafeFraction();
        var globalSweepPath = TargetLocation - _dashCast3D.GlobalPosition;
        var locationAlongPath = _dashCast3D.GlobalPosition + globalSweepPath * fraction;
        
        // 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);
        PlannedPlayerLocation = locationAlongPath 
                                + CollisionNormal 
                                * maxPushDownDistance 
                                * Mathf.Clamp(proportion, 0, 1) 
                                * Mathf.Clamp(correctionProportion, 0, 1);
    }

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

        ComputeDashLocation();
        
        ShouldMantle = false;
        var mantleLocation = Vector3.Zero;
        if (HasHit && Mathf.Abs(CollisionNormal.Y) < 0.5f)
        {
            var mantleResult = _mantleSystem.FindMantleLocationAtPoint(PlannedPlayerLocation, CollisionNormal);
            ShouldMantle = mantleResult.IsSome(out mantleLocation);
        }
        PlannedMantleLocation = mantleLocation;
        
        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(PlannedPlayerLocation);
    }

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

    public void DashTweenEnded()
    {
        EmitSignal(SignalName.DashEnded);
        _dashTarget.SetVisible(false);
    }

    public void Dash()
    {
        EmitSignal(SignalName.DashStarted);
        
        var dashTweenInputs = new TweenQueueSystem.TweenInputs(PlannedPlayerLocation, DashSpeed);
        var dashTween = _tweenQueueSystem.TweenToLocation(dashTweenInputs);
        // dashTween.SetTrans(Tween.TransitionType.Cubic);
        // dashTween.SetEase(Tween.EaseType.Out);
        dashTween.TweenMethod(Callable.From<float>(Dashing), 0.0f, 1.0f, DashSpeed);
        dashTween.Finished += DashTweenEnded;
        if (ShouldMantle)
        {
            _tweenQueueSystem.QueueTween(PlannedMantleLocation, 0.2f);
            return;
        }

        // var dashIndicator = (CpuParticles3D) DashIndicatorScene.Instantiate();
        // GetTree().GetRoot().AddChild(dashIndicator);
        // _globalDashPosition = _dashTarget.GlobalPosition + 1.5f*Vector3.Up;
        // dashIndicator.GlobalPosition = _globalDashPosition;
        // dashIndicator.SetEmitting(true);
    }

    public void Dashing(float proportion)
    {
        _dashTarget.SetGlobalPosition(_globalDashPosition);
        EmitSignalDashProgress(proportion);
    }

    public void DashToThrownWeapon()
    {
        
    }

    public void DashToPlantedWeapon()
    {
        
    }
}