using Barotrauma.Items.Components;
using FarseerPhysics;
using Microsoft.Xna.Framework;
using System;
using System.Collections.Generic;
using System.Linq;
using Barotrauma.Extensions;
using Barotrauma.Networking;

namespace Barotrauma
{
    class HumanoidAnimController : AnimController
    {
        public override RagdollParams RagdollParams
        {
            get { return HumanRagdollParams; }
            protected set { HumanRagdollParams = value as HumanRagdollParams; }
        }

        private HumanRagdollParams _ragdollParams;
        public HumanRagdollParams HumanRagdollParams
        {
            get
            {
                if (character.Info == null)
                {
                    if (_ragdollParams == null)
                    {
                        _ragdollParams = RagdollParams.GetDefaultRagdollParams<HumanRagdollParams>(character.SpeciesName);
                    }
                    return _ragdollParams;
                }
                return character.Info.Ragdoll as HumanRagdollParams;                
            }
            protected set
            {
                if (character.Info == null)
                {
                    _ragdollParams = value;
                }
                else
                {
                    character.Info.Ragdoll = value;
                }
            }
        }

        private HumanWalkParams _humanWalkParams;
        public HumanWalkParams HumanWalkParams
        {
            get
            {
                if (_humanWalkParams == null)
                {
                    _humanWalkParams = HumanWalkParams.GetDefaultAnimParams(character);
                }
                return _humanWalkParams;
            }
            set { _humanWalkParams = value; }
        }

        private HumanRunParams _humanRunParams;
        public HumanRunParams HumanRunParams
        {
            get
            {
                if (_humanRunParams == null)
                {
                    _humanRunParams = HumanRunParams.GetDefaultAnimParams(character);
                }
                return _humanRunParams;
            }
            set { _humanRunParams = value; }
        }

        private HumanSwimSlowParams _humanSwimSlowParams;
        public HumanSwimSlowParams HumanSwimSlowParams
        {
            get
            {
                if (_humanSwimSlowParams == null)
                {
                    _humanSwimSlowParams = HumanSwimSlowParams.GetDefaultAnimParams(character);
                }
                return _humanSwimSlowParams;
            }
            set { _humanSwimSlowParams = value; }
        }

        private HumanSwimFastParams _humanSwimFastParams;
        public HumanSwimFastParams HumanSwimFastParams
        {
            get
            {
                if (_humanSwimFastParams == null)
                {
                    _humanSwimFastParams = HumanSwimFastParams.GetDefaultAnimParams(character);
                }
                return _humanSwimFastParams;
            }
            set { _humanSwimFastParams = value; }
        }

        public new HumanGroundedParams CurrentGroundedParams => base.CurrentGroundedParams as HumanGroundedParams;
        public new HumanSwimParams CurrentSwimParams => base.CurrentSwimParams as HumanSwimParams;

        public override GroundedMovementParams WalkParams
        {
            get { return HumanWalkParams; }
            set { HumanWalkParams = value as HumanWalkParams; }
        }

        public override GroundedMovementParams RunParams
        {
            get { return HumanRunParams; }
            set { HumanRunParams = value as HumanRunParams; }
        }

        public override SwimParams SwimSlowParams
        {
            get { return HumanSwimSlowParams; }
            set { HumanSwimSlowParams = value as HumanSwimSlowParams; }
        }

        public override SwimParams SwimFastParams
        {
            get { return HumanSwimFastParams; }
            set { HumanSwimFastParams = value as HumanSwimFastParams; }
        }

        public bool Crouching;

        private float upperArmLength = 0.0f, forearmLength = 0.0f;

        public float ArmLength => upperArmLength + forearmLength;

        public Vector2 RightHandIKPos
        {
            get;
            private set;
        }
        public Vector2 LeftHandIKPos
        {
            get;
            private set;
        }

        private LimbJoint shoulder;

        private float upperLegLength = 0.0f, lowerLegLength = 0.0f;

        private bool aiming;

        private float movementLerp;

        private float cprAnimTimer;
        private float cprPump;

        private bool swimming;
        //time until the character can switch from walking to swimming or vice versa
        //prevents rapid switches between swimming/walking if the water level is fluctuating around the minimum swimming depth
        private float swimmingStateLockTimer;

        private float useItemTimer;
        
        public override float? TorsoPosition
        {
            get
            {
                return Crouching ? CurrentGroundedParams.CrouchingTorsoPos * RagdollParams.JointScale : base.TorsoPosition;
            }
        }

        public override float? HeadPosition
        {
            get
            {
                return Crouching ? CurrentGroundedParams.CrouchingHeadPos * RagdollParams.JointScale : base.HeadPosition;
            }
        }

        public override float? TorsoAngle
        {
            get
            {
                return Crouching ? MathHelper.ToRadians(CurrentGroundedParams.CrouchingTorsoAngle) : base.TorsoAngle;
            }
        }

        public override float? HeadAngle
        {
            get
            {
                return Crouching ? MathHelper.ToRadians(CurrentGroundedParams.CrouchingHeadAngle) : base.HeadAngle;
            }
        }

        public float HeadLeanAmount => CurrentGroundedParams.HeadLeanAmount;
        public float TorsoLeanAmount => CurrentGroundedParams.TorsoLeanAmount;
        public Vector2 FootMoveOffset => (Crouching ? CurrentGroundedParams.CrouchingFootMoveOffset : CurrentGroundedParams.FootMoveOffset) * RagdollParams.JointScale;
        public float LegBendTorque => CurrentGroundedParams.LegBendTorque * RagdollParams.JointScale;
        public Vector2 HandMoveOffset => CurrentGroundedParams.HandMoveOffset * RagdollParams.JointScale;

        public override Vector2 AimSourceSimPos
        {
            get
            {
                float shoulderHeight = Collider.height / 2.0f - 0.1f;
                if (inWater)
                {
                    shoulderHeight += 0.4f;
                }
                else if (Crouching)
                {
                    shoulderHeight -= 0.15f;
                }

                return Collider.SimPosition + new Vector2(
                    (float)Math.Sin(-Collider.Rotation),
                    (float)Math.Cos(-Collider.Rotation)) * shoulderHeight;
            }
        }

        public HumanoidAnimController(Character character, string seed, HumanRagdollParams ragdollParams = null) : base(character, seed, ragdollParams)
        {
            // TODO: load from the character info file?
            movementLerp = RagdollParams.MainElement.GetAttributeFloat("movementlerp", 0.4f);
        }

        public override void Recreate(RagdollParams ragdollParams)
        {
            base.Recreate(ragdollParams);
            CalculateArmLengths();
            CalculateLegLengths();
        }

        private void CalculateArmLengths()
        {
            //calculate arm and forearm length (atm this assumes that both arms are the same size)
            Limb rightForearm = GetLimb(LimbType.RightForearm);
            Limb rightHand = GetLimb(LimbType.RightHand);

            shoulder = GetJointBetweenLimbs(LimbType.Torso, LimbType.RightArm);
            Vector2 localAnchorShoulder = Vector2.Zero;
            Vector2 localAnchorElbow = Vector2.Zero;
            if (shoulder != null)
            {
                localAnchorShoulder = shoulder.LimbA.type == LimbType.RightArm ? shoulder.LocalAnchorA : shoulder.LocalAnchorB;
            }
            LimbJoint rightElbow = rightForearm == null ?
                GetJointBetweenLimbs(LimbType.RightArm, LimbType.RightHand) :
                GetJointBetweenLimbs(LimbType.RightArm, LimbType.RightForearm);
            if (rightElbow != null)
            {
                localAnchorElbow = rightElbow.LimbA.type == LimbType.RightArm ? rightElbow.LocalAnchorA : rightElbow.LocalAnchorB;
            }
            upperArmLength = Vector2.Distance(localAnchorShoulder, localAnchorElbow);
            if (rightElbow != null)
            {
                if (rightForearm == null)
                {
                    forearmLength = Vector2.Distance(
                        rightHand.PullJointLocalAnchorA,
                        rightElbow.LimbA.type == LimbType.RightHand ? rightElbow.LocalAnchorA : rightElbow.LocalAnchorB);
                }
                else if (rightForearm != null && rightHand != null)
                {
                    LimbJoint rightWrist = rightForearm == null ? null : GetJointBetweenLimbs(LimbType.RightForearm, LimbType.RightHand);
                    forearmLength = Vector2.Distance(
                        rightElbow.LimbA.type == LimbType.RightForearm ? rightElbow.LocalAnchorA : rightElbow.LocalAnchorB,
                        rightWrist.LimbA.type == LimbType.RightForearm ? rightWrist.LocalAnchorA : rightWrist.LocalAnchorB);
                    forearmLength += Vector2.Distance(
                        rightHand.PullJointLocalAnchorA,
                        rightElbow.LimbA.type == LimbType.RightHand ? rightElbow.LocalAnchorA : rightElbow.LocalAnchorB);
                }
            }
        }

        private void CalculateLegLengths()
        {
            //calculate upper and lower leg length (atm this assumes that both legs are the same size)
            LimbType upperLegType = LimbType.RightThigh;
            LimbType lowerLegType = LimbType.RightLeg;
            LimbType footType = LimbType.RightFoot;

            var waistJoint = GetJointBetweenLimbs(LimbType.Waist, upperLegType);
            Vector2 localAnchorWaist = Vector2.Zero;
            Vector2 localAnchorKnee = Vector2.Zero;
            if (shoulder != null)
            {
                localAnchorWaist = waistJoint.LimbA.type == upperLegType ? waistJoint.LocalAnchorA : waistJoint.LocalAnchorB;
            }
            LimbJoint kneeJoint = GetJointBetweenLimbs(upperLegType, lowerLegType);
            if (kneeJoint != null)
            {
                localAnchorKnee = kneeJoint.LimbA.type == upperLegType ? kneeJoint.LocalAnchorA : kneeJoint.LocalAnchorB;
            }
            upperLegLength = Vector2.Distance(localAnchorWaist, localAnchorKnee);

            LimbJoint ankleJoint = GetJointBetweenLimbs(lowerLegType, footType);
            lowerLegLength = Vector2.Distance(
                kneeJoint.LimbA.type == lowerLegType ? kneeJoint.LocalAnchorA : kneeJoint.LocalAnchorB,
                ankleJoint.LimbA.type == lowerLegType ? ankleJoint.LocalAnchorA : ankleJoint.LocalAnchorB);
            lowerLegLength += Vector2.Distance(
                ankleJoint.LimbA.type == footType ? ankleJoint.LocalAnchorA : ankleJoint.LocalAnchorB,
                GetLimb(footType).PullJointLocalAnchorA);
        }
        private LimbJoint GetJointBetweenLimbs(LimbType limbTypeA, LimbType limbTypeB)
        {
            return LimbJoints.FirstOrDefault(lj =>
                (lj.LimbA.type == limbTypeA && lj.LimbB.type == limbTypeB) ||
                (lj.LimbB.type == limbTypeA && lj.LimbA.type == limbTypeB));
        }

        public override void UpdateAnim(float deltaTime)
        {
            if (Frozen) return;
            if (MainLimb == null) { return; }

            levitatingCollider = true;
            ColliderIndex = Crouching ? 1 : 0;
            if (!Crouching && ColliderIndex == 1) Crouching = true;

            //stun (= disable the animations) if the ragdoll receives a large enough impact
            if (strongestImpact > 0.0f)
            {
                character.SetStun(MathHelper.Min(strongestImpact * 0.5f, 5.0f));
                strongestImpact = 0.0f;
                return;
            }

            if (character.IsDead)
            {
                if (deathAnimTimer < deathAnimDuration)
                {
                    deathAnimTimer += deltaTime;
                    UpdateDying(deltaTime);
                }
            }
            else
            {
                deathAnimTimer = 0.0f;
            } 

            if (!character.AllowInput)
            {
                levitatingCollider = false;
                Collider.FarseerBody.FixedRotation = false;
                if (GameMain.NetworkMember == null || !GameMain.NetworkMember.IsClient)
                {
                    Collider.Enabled = false;
                    Collider.LinearVelocity = MainLimb.LinearVelocity;
                    Collider.SetTransformIgnoreContacts(MainLimb.SimPosition, MainLimb.Rotation);
                }
                return;
            }

            //re-enable collider
            if (!Collider.Enabled)
            {
                var lowestLimb = FindLowestLimb();
                
                Collider.SetTransform(new Vector2(
                    Collider.SimPosition.X,
                    Math.Max(lowestLimb.SimPosition.Y + (Collider.radius + Collider.height / 2), Collider.SimPosition.Y)),
                    Collider.Rotation);
                
                Collider.FarseerBody.ResetDynamics();
                Collider.Enabled = true;
            }            

            if (swimming)
            {
                Collider.FarseerBody.FixedRotation = false;
            }
            else if (!Collider.FarseerBody.FixedRotation)
            {
                if (Math.Abs(MathUtils.GetShortestAngle(Collider.Rotation, 0.0f)) > 0.001f)
                {
                    //rotate collider back upright
                    Collider.AngularVelocity = MathUtils.GetShortestAngle(Collider.Rotation, 0.0f) * 10.0f;

                    Collider.FarseerBody.FixedRotation = false;
                }
                else
                {
                    Collider.FarseerBody.FixedRotation = true;
                }
            }

            if (character.LockHands)
            {
                var leftHand = GetLimb(LimbType.LeftHand);
                var rightHand = GetLimb(LimbType.RightHand);

                var waist = GetLimb(LimbType.Waist) ?? GetLimb(LimbType.Torso);

                rightHand.Disabled = true;
                leftHand.Disabled = true;

                Vector2 midPos = waist.SimPosition;
                Matrix torsoTransform = Matrix.CreateRotationZ(waist.Rotation);

                midPos += Vector2.Transform(new Vector2(-0.3f * Dir, -0.2f), torsoTransform);

                if (rightHand.PullJointEnabled) midPos = (midPos + rightHand.PullJointWorldAnchorB) / 2.0f;

                HandIK(rightHand, midPos);
                HandIK(leftHand, midPos);
            }
            else if (character.AnimController.AnimationTestPose)
            {
                var leftHand = GetLimb(LimbType.LeftHand);
                var rightHand = GetLimb(LimbType.RightHand);
                var waist = GetLimb(LimbType.Waist) ?? GetLimb(LimbType.Torso);
                rightHand.Disabled = true;
                leftHand.Disabled = true;
                Vector2 midPos = waist.SimPosition;
                HandIK(rightHand, midPos + new Vector2(-1, -0.2f) * Dir);
                HandIK(leftHand, midPos + new Vector2(1, -0.2f) * Dir);

                var leftFoot = GetLimb(LimbType.LeftFoot);
                var rightFoot = GetLimb(LimbType.RightFoot);
                rightFoot.Disabled = true;
                leftFoot.Disabled = true;
                // The code here is a bit obscure, but it's pretty much copy-pasted from the block that is used for crouching.
                for (int i = -1; i < 2; i += 2)
                {
                    Vector2 footPos = GetColliderBottom();
                    footPos = new Vector2(waist.SimPosition.X + Math.Sign(StepSize.Value.X * i) * Dir * 0.3f, footPos.Y - 0.1f * RagdollParams.JointScale);
                    var foot = i == -1 ? rightFoot : leftFoot;
                    MoveLimb(foot, footPos, Math.Abs(foot.SimPosition.X - footPos.X) * 100.0f, true);
                }
            }
            else
            {
                if (Anim != Animation.UsingConstruction) ResetPullJoints();
            }

            if (SimplePhysicsEnabled)
            {
                UpdateStandingSimple();
                return;
            }

            if (character.SelectedCharacter != null)
            {
                DragCharacter(character.SelectedCharacter, deltaTime);
            }

            switch (Anim)
            {
                case Animation.Climbing:
                    levitatingCollider = false;
                    UpdateClimbing();
                    break;
                case Animation.CPR:
                    UpdateCPR(deltaTime);
                    break;
                case Animation.UsingConstruction:
                default:
                    if (Anim == Animation.UsingConstruction)
                    {
                        useItemTimer -= deltaTime;
                        if (useItemTimer <= 0.0f) Anim = Animation.None;
                    }

                    swimmingStateLockTimer -= deltaTime;

                    if (forceStanding)
                    {
                        swimming = false;
                    }
                    else
                    {
                        //0.5 second delay for switching between swimming and walking
                        //prevents rapid switches between swimming/walking if the water level is fluctuating around the minimum swimming depth
                        if (swimming != inWater && swimmingStateLockTimer <= 0.0f)
                        {
                            swimming = inWater;
                            swimmingStateLockTimer = 0.5f;
                        }
                    }

                    if (swimming)
                    {
                        UpdateSwimming();
                    }
                    else
                    {
                        UpdateStanding();
                    }

                    break;
            }

            if (TargetDir != dir && !IsStuck)
            {
                Flip();
            }

            foreach (Limb limb in Limbs)
            {
                limb.Disabled = false;
            }

            aiming = false;
            if (GameMain.NetworkMember == null || GameMain.NetworkMember.IsServer) return;
        }

        void UpdateStanding()
        {
            if (CurrentGroundedParams == null) { return; }
            Vector2 handPos;

            //if you're allergic to magic numbers, stop reading now

            Limb leftFoot = GetLimb(LimbType.LeftFoot);
            Limb rightFoot = GetLimb(LimbType.RightFoot);
            Limb head = GetLimb(LimbType.Head);
            Limb torso = GetLimb(LimbType.Torso);

            Limb waist = GetLimb(LimbType.Waist);

            Limb leftHand = GetLimb(LimbType.LeftHand);
            Limb rightHand = GetLimb(LimbType.RightHand);

            Limb leftLeg = GetLimb(LimbType.LeftLeg);
            Limb rightLeg = GetLimb(LimbType.RightLeg);
            
            float walkCycleMultiplier = 1.0f;
            if (Stairs != null)
            {
                //TODO: allow editing these values in character editor?
                bool running = Math.Abs(targetMovement.X) > 2.0f;
                TargetMovement = new Vector2(MathHelper.Clamp(TargetMovement.X, -1.7f, 1.7f), TargetMovement.Y);                
                walkCycleMultiplier *= 1.5f;                
            }

            float getUpForce = CurrentGroundedParams.GetUpForce / RagdollParams.JointScale;

            Vector2 colliderPos = GetColliderBottom();
            if (Math.Abs(TargetMovement.X) > 1.0f)
            {
                float slowdownAmount = 0.0f;
                if (currentHull != null)
                {
                    //full slowdown (1.5f) when water is up to the torso
                    surfaceY = ConvertUnits.ToSimUnits(currentHull.Surface);
                    slowdownAmount = MathHelper.Clamp((surfaceY - colliderPos.Y) / TorsoPosition.Value, 0.0f, 1.0f) * 1.5f;
                }

                float maxSpeed = Math.Max(TargetMovement.Length() - slowdownAmount, 1.0f);
                TargetMovement = Vector2.Normalize(TargetMovement) * maxSpeed;
            }

            float walkPosX = (float)Math.Cos(WalkPos);
            float walkPosY = (float)Math.Sin(WalkPos);


            Vector2 stepSize = StepSize.Value;
            stepSize.X *= walkPosX;
            stepSize.Y *= walkPosY;                

            float footMid = colliderPos.X;// (leftFoot.SimPosition.X + rightFoot.SimPosition.X) / 2.0f;

            movement = overrideTargetMovement == Vector2.Zero ?
                MathUtils.SmoothStep(movement, TargetMovement, movementLerp) :
                overrideTargetMovement;

            if (Math.Abs(movement.X) < 0.005f)
            {
                movement.X = 0.0f;
            }

            movement.Y = 0.0f;

            if (torso == null) { return; }
            
            bool isNotRemote = true;
            if (GameMain.NetworkMember != null && GameMain.NetworkMember.IsClient) isNotRemote = !character.IsRemotePlayer;

            if (onGround && isNotRemote)
            {
                //move slower if collider isn't upright
                float rotationFactor = (float)Math.Abs(Math.Cos(Collider.Rotation));

                Collider.LinearVelocity = new Vector2(
                        movement.X * rotationFactor,
                        Collider.LinearVelocity.Y > 0.0f ? Collider.LinearVelocity.Y * 0.5f : Collider.LinearVelocity.Y);
            }

            getUpForce = getUpForce * Math.Max(head.SimPosition.Y - colliderPos.Y, 0.5f);

            torso.PullJointEnabled = true;
            head.PullJointEnabled = true;
            if (waist != null)
            {
                waist.PullJointEnabled = true;
            }
            
            float floorPos = GetFloorY(colliderPos + new Vector2(Math.Sign(movement.X) * 0.5f, 1.0f));
            bool onSlope = floorPos > GetColliderBottom().Y + 0.05f;

            if (Stairs != null || onSlope)
            {
                torso.PullJointWorldAnchorB = new Vector2(
                    MathHelper.SmoothStep(torso.SimPosition.X, footMid + movement.X * TorsoLeanAmount, getUpForce * 0.8f),
                    MathHelper.SmoothStep(torso.SimPosition.Y, colliderPos.Y + TorsoPosition.Value - Math.Abs(walkPosX * 0.05f), getUpForce * 2.0f));

                head.PullJointWorldAnchorB = new Vector2(
                    MathHelper.SmoothStep(head.SimPosition.X, footMid + movement.X * HeadLeanAmount, getUpForce * 0.8f),
                    MathHelper.SmoothStep(head.SimPosition.Y, colliderPos.Y + HeadPosition.Value - Math.Abs(walkPosX * 0.05f), getUpForce * 2.0f));

                if (waist != null)
                {
                    waist.PullJointWorldAnchorB = waist.SimPosition - movement * 0.06f;
                }
            }
            else
            {
                if (!onGround) movement = Vector2.Zero;

                float y = colliderPos.Y;
                if (TorsoPosition.HasValue)
                {
                    y += TorsoPosition.Value;
                }
                torso.PullJointWorldAnchorB =
                    MathUtils.SmoothStep(torso.SimPosition,
                    new Vector2(footMid + movement.X * TorsoLeanAmount, y), getUpForce);

                y = colliderPos.Y;
                if (HeadPosition.HasValue)
                {
                    y += HeadPosition.Value;
                }
                head.PullJointWorldAnchorB =
                    MathUtils.SmoothStep(head.SimPosition,
                    new Vector2(footMid + movement.X * HeadLeanAmount, y), getUpForce * 1.2f);

                if (waist != null)
                {
                    waist.PullJointWorldAnchorB = waist.SimPosition + movement * 0.06f;
                }
            }

            if (TorsoAngle.HasValue) torso.body.SmoothRotate(TorsoAngle.Value * Dir, 50.0f);
            if (HeadAngle.HasValue) head.body.SmoothRotate(HeadAngle.Value * Dir, 50.0f);

            if (!onGround)
            {
                Vector2 move = torso.PullJointWorldAnchorB - torso.SimPosition;

                foreach (Limb limb in Limbs)
                {
                    MoveLimb(limb, limb.SimPosition + move, 15.0f, true);
                }

                return;
            }

            Vector2 waistPos = waist != null ? waist.SimPosition : torso.SimPosition;

            //moving horizontally
            if (TargetMovement.X != 0.0f)
            {
                //progress the walking animation
                WalkPos -= MathHelper.ToRadians(CurrentAnimationParams.CycleSpeed) * walkCycleMultiplier * movement.X;

                for (int i = -1; i < 2; i += 2)
                {
                    Limb foot = i == -1 ? leftFoot : rightFoot;
                    Limb leg = i == -1 ? leftLeg : rightLeg;

                    Vector2 footPos = stepSize * -i;
                    footPos += new Vector2(Math.Sign(movement.X) * FootMoveOffset.X, FootMoveOffset.Y);

                    if (footPos.Y < 0.0f) footPos.Y = -0.15f;

                    //make the character limp if the feet are damaged
                    float footAfflictionStrength = character.CharacterHealth.GetAfflictionStrength("damage", foot, true);
                    footPos *= MathHelper.Lerp(1.0f, 0.5f, MathHelper.Clamp(footAfflictionStrength / 100.0f, 0.0f, 1.0f));

                    if (onSlope && Stairs == null)
                    {
                        footPos.Y *= 2.0f;
                    }
                    footPos.Y = Math.Min(waistPos.Y - colliderPos.Y - 0.4f, footPos.Y);

                    if (!foot.Disabled)
                    {
                        foot.DebugRefPos = colliderPos;
                        foot.DebugTargetPos = colliderPos + footPos;
                        MoveLimb(foot, colliderPos + footPos, CurrentGroundedParams.FootMoveStrength);
                        FootIK(foot, colliderPos + footPos, 
                            CurrentGroundedParams.LegBendTorque, CurrentGroundedParams.FootRotateStrength, CurrentGroundedParams.FootAngleInRadians);
                    }
                }

                //calculate the positions of hands
                handPos = torso.SimPosition;
                handPos.X = -walkPosX * CurrentGroundedParams.HandMoveAmount.X;

                float lowerY = CurrentGroundedParams.HandClampY;

                handPos.Y = lowerY + (float)(Math.Abs(Math.Sin(WalkPos - Math.PI * 1.5f) * CurrentGroundedParams.HandMoveAmount.Y));

                Vector2 posAddition = new Vector2(Math.Sign(movement.X) * HandMoveOffset.X, HandMoveOffset.Y);

                if (!rightHand.Disabled)
                {
                    HandIK(rightHand, torso.SimPosition + posAddition +
                        new Vector2(
                            -handPos.X,
                            (Math.Sign(walkPosX) == Math.Sign(Dir)) ? handPos.Y : lowerY), CurrentGroundedParams.HandMoveStrength);
                }

                if (!leftHand.Disabled)
                {
                    HandIK(leftHand, torso.SimPosition + posAddition +
                        new Vector2(
                            handPos.X,
                            (Math.Sign(walkPosX) == Math.Sign(-Dir)) ? handPos.Y : lowerY), CurrentGroundedParams.HandMoveStrength);
                }

            }
            else
            {
                for (int i = -1; i < 2; i += 2)
                {
                    Vector2 footPos = colliderPos;
                    
                    if (Crouching)
                    {
                        footPos = new Vector2(
                            waistPos.X + Math.Sign(stepSize.X * i) * Dir * 0.1f,
                            colliderPos.Y - 0.1f);
                    }
                    else
                    {
                        footPos = new Vector2(colliderPos.X + stepSize.X * i * 0.2f, colliderPos.Y - 0.1f);
                    }

                    if (Stairs == null)
                    {
                        footPos.Y = Math.Max(Math.Min(floorPos, footPos.Y + 0.5f), footPos.Y);
                    }

                    var foot = i == -1 ? rightFoot : leftFoot;
                    Limb leg = i == -1 ? rightLeg : leftLeg;

                    if (!foot.Disabled)
                    {
                        foot.DebugRefPos = colliderPos;
                        foot.DebugTargetPos = footPos;
                        MoveLimb(foot, footPos, CurrentGroundedParams.FootMoveStrength);
                        FootIK(foot, footPos, 
                            CurrentGroundedParams.LegBendTorque, CurrentGroundedParams.FootRotateStrength, CurrentGroundedParams.FootAngleInRadians);
                    }
                }

                for (int i = 0; i < 2; i++)
                {
                    var hand = i == 0 ? rightHand : leftHand;
                    if (hand.Disabled) { continue; }

                    var armType = i == 0 ? LimbType.RightArm : LimbType.LeftArm;
                    var foreArmType = i == 0 ? LimbType.RightForearm : LimbType.LeftForearm;

                    //get the upper arm to point downwards
                    var arm = GetLimb(armType);
                    arm.body.SmoothRotate(MathHelper.Clamp(-arm.body.AngularVelocity, -0.1f, 0.1f), arm.Mass * 10.0f);

                    //get the elbow to a neutral rotation
                    LimbJoint elbow =
                        GetJointBetweenLimbs(armType, hand.type) ??
                        GetJointBetweenLimbs(armType, foreArmType);
                    hand.body.ApplyTorque(-elbow.JointAngle * hand.Mass * 10.0f);
                }
            }
        }

        void UpdateStandingSimple()
        {
            if (Math.Abs(movement.X) < 0.005f)
            {
                movement.X = 0.0f;
            }
            movement = MathUtils.SmoothStep(movement, TargetMovement, movementLerp);

            if (InWater)
            {
                Collider.LinearVelocity = movement;
            }
            else if (onGround && (!character.IsRemotePlayer || (GameMain.NetworkMember != null && GameMain.NetworkMember.IsServer)))
            {
                Collider.LinearVelocity = new Vector2(
                        movement.X,
                        Collider.LinearVelocity.Y > 0.0f ? Collider.LinearVelocity.Y * 0.5f : Collider.LinearVelocity.Y);                
            }
        }

        private void ClimbOverObstacles()
        {
            if (Collider.FarseerBody.ContactList == null || Math.Abs(movement.X) < 0.01f) return;

            //check if the collider is touching a suitable obstacle to climb over
            Vector2? handle = null;
            FarseerPhysics.Dynamics.Contacts.ContactEdge ce = Collider.FarseerBody.ContactList;
            while (ce != null && ce.Contact != null)
            {
                if (ce.Contact.Enabled && ce.Contact.IsTouching && ce.Contact.FixtureA.CollisionCategories.HasFlag(Physics.CollisionWall))
                {
                    Vector2 contactNormal;
                    FarseerPhysics.Common.FixedArray2<Vector2> contactPos;
                    ce.Contact.GetWorldManifold(out contactNormal, out contactPos);

                    //only climb if moving towards the obstacle
                    if (Math.Sign(contactPos[0].X - Collider.SimPosition.X) == Math.Sign(movement.X) &&
                        (handle == null || contactPos[0].Y > ((Vector2)handle).Y))
                    {
                        handle = contactPos[0];
                    }
                }

                ce = ce.Next;
            }
            
            if (handle == null) return;

            float colliderBottomY = GetColliderBottom().Y;

            //the contact point should be higher than the bottom of the collider
            if (((Vector2)handle).Y < colliderBottomY + 0.01f ||
                ((Vector2)handle).Y > Collider.SimPosition.Y) return;
            
            //find the height of the floor below the torso
            //(if moving towards towards an obstacle that's low enough to climb over, the torso should be above it)
            float obstacleY = GetFloorY(GetLimb(LimbType.Torso));

            if (obstacleY > colliderBottomY)
            {
                //higher vertical velocity for taller obstacles
                Collider.LinearVelocity += Vector2.UnitY * (((Vector2)handle).Y - colliderBottomY + 0.01f) * 50;
                onGround = true;
            }
        }

        private float handCyclePos;
        private float legCyclePos;
        void UpdateSwimming()
        {
            if (CurrentSwimParams == null) { return; }
            IgnorePlatforms = true;

            Vector2 footPos, handPos;

            float surfaceLimiter = 1.0f;

            Limb head = GetLimb(LimbType.Head);
            Limb torso = GetLimb(LimbType.Torso);
            
            if (currentHull != null)
            {
                float surfacePos = currentHull.Surface;
                //if the hull is almost full of water, check if there's a water-filled hull above it
                //and use its water surface instead of the current hull's 
                if (currentHull.Rect.Y - currentHull.Surface < 5.0f)
                {
                    foreach (Gap gap in currentHull.ConnectedGaps)
                    {
                        if (gap.IsHorizontal || gap.Open <= 0.0f) continue;
                        if (Collider.SimPosition.X < ConvertUnits.ToSimUnits(gap.Rect.X) || Collider.SimPosition.X > ConvertUnits.ToSimUnits(gap.Rect.Right)) continue;
                        
                        //if the gap is above us and leads outside, there's no surface to limit the movement
                        if (!gap.IsRoomToRoom && gap.Position.Y > currentHull.Position.Y)
                        {
                            surfacePos += 100000.0f;
                            continue;
                        }

                        foreach (var linkedTo in gap.linkedTo)
                        {
                            if (linkedTo is Hull hull && hull != currentHull)
                            {
                                surfacePos = Math.Max(surfacePos, hull.Surface);
                                break;
                            }
                        }
                    }
                }

                surfaceLimiter = ConvertUnits.ToDisplayUnits(Collider.SimPosition.Y + 0.4f) - surfacePos;
                surfaceLimiter = Math.Max(1.0f, surfaceLimiter);
                if (surfaceLimiter > 50.0f) return;
            }

            Limb leftHand = GetLimb(LimbType.LeftHand);
            Limb rightHand = GetLimb(LimbType.RightHand);

            Limb leftFoot = GetLimb(LimbType.LeftFoot);
            Limb rightFoot = GetLimb(LimbType.RightFoot);
            
            float rotation = MathHelper.WrapAngle(Collider.Rotation);
            rotation = MathHelper.ToDegrees(rotation);
            if (rotation < 0.0f) rotation += 360;

            if (!character.IsRemotePlayer && !aiming && Anim != Animation.UsingConstruction)
            {
                if (rotation > 20 && rotation < 170)
                    TargetDir = Direction.Left;
                else if (rotation > 190 && rotation < 340)
                    TargetDir = Direction.Right;
            }

            float targetSpeed = TargetMovement.Length();

            if (targetSpeed > 0.1f)
            {
                if (!aiming)
                {
                    float newRotation = MathUtils.VectorToAngle(TargetMovement) - MathHelper.PiOver2;
                    Collider.SmoothRotate(newRotation, 5.0f);
                    //torso.body.SmoothRotate(newRotation);                
                }
            }
            else
            {
                if (aiming)
                {
                    Vector2 mousePos = ConvertUnits.ToSimUnits(character.CursorPosition);
                    Vector2 diff = (mousePos - torso.SimPosition) * Dir;

                    TargetMovement = new Vector2(0.0f, -0.1f);

                    float newRotation = MathUtils.VectorToAngle(diff);
                    Collider.SmoothRotate(newRotation, 5.0f);
                }
            }

            torso.body.MoveToPos(Collider.SimPosition + new Vector2((float)Math.Sin(-Collider.Rotation), (float)Math.Cos(-Collider.Rotation)) * 0.4f, 5.0f);

            if (TargetMovement == Vector2.Zero) return;

            movement = MathUtils.SmoothStep(movement, TargetMovement, 0.3f);

            if (TorsoAngle.HasValue)
            {
                torso.body.SmoothRotate(Collider.Rotation + TorsoAngle.Value * Dir, CurrentSwimParams.SteerTorque);
            }
            else
            {
                torso.body.SmoothRotate(Collider.Rotation, CurrentSwimParams.SteerTorque);
            }
            if (HeadAngle.HasValue)
            {
                head.body.SmoothRotate(Collider.Rotation + HeadAngle.Value * Dir, CurrentSwimParams.SteerTorque);
            }
            else
            {
                head.body.SmoothRotate(Collider.Rotation, CurrentSwimParams.SteerTorque);
            }

            //dont try to move upwards if head is already out of water
            if (surfaceLimiter > 1.0f && TargetMovement.Y > 0.0f)
            {
                if (TargetMovement.X == 0.0f)
                {
                    //pull head above water
                    head.body.SmoothRotate(0.0f, 5.0f);

                    WalkPos += 0.05f;
                }
                else
                {
                    TargetMovement = new Vector2(
                        (float)Math.Sqrt(targetSpeed * targetSpeed - TargetMovement.Y * TargetMovement.Y)
                        * Math.Sign(TargetMovement.X),
                        Math.Max(TargetMovement.Y, TargetMovement.Y * 0.2f));

                    //turn head above the water
                    head.body.ApplyTorque(Dir);
                }

                movement.Y = movement.Y - (surfaceLimiter - 1.0f) * 0.01f;
            }

            bool isNotRemote = true;
            if (GameMain.NetworkMember != null && GameMain.NetworkMember.IsClient) isNotRemote = !character.IsRemotePlayer;

            if (isNotRemote)
            {
                Collider.LinearVelocity = Vector2.Lerp(Collider.LinearVelocity, movement, movementLerp);
            }

            WalkPos += movement.Length();
            legCyclePos += Vector2.Normalize(movement).Length();
            handCyclePos += MathHelper.ToRadians(CurrentSwimParams.HandCycleSpeed) * Math.Sign(movement.X);

            footPos = GetLimb(LimbType.Waist).SimPosition - new Vector2((float)Math.Sin(-Collider.Rotation), (float)Math.Cos(-Collider.Rotation)) * (upperLegLength + lowerLegLength);
            Vector2 transformedFootPos = new Vector2((float)Math.Sin(legCyclePos / CurrentSwimParams.LegCycleLength) * CurrentSwimParams.LegMoveAmount * CurrentAnimationParams.CycleSpeed, 0.0f);
            transformedFootPos = Vector2.Transform(transformedFootPos, Matrix.CreateRotationZ(Collider.Rotation));

            FootIK(rightFoot, footPos - transformedFootPos, CurrentSwimParams.FootRotateStrength, CurrentSwimParams.FootRotateStrength, CurrentSwimParams.FootAngleInRadians);
            FootIK(leftFoot, footPos + transformedFootPos, CurrentSwimParams.FootRotateStrength, CurrentSwimParams.FootRotateStrength, CurrentSwimParams.FootAngleInRadians);

            handPos = (torso.SimPosition + head.SimPosition) / 2.0f;

            //at the surface, not moving sideways -> hands just float around
            if (!headInWater && TargetMovement.X == 0.0f && TargetMovement.Y > 0)
            {
                handPos.X = handPos.X + Dir * 0.6f;

                float wobbleAmount = 0.1f;

                if (!rightHand.Disabled)
                {
                    MoveLimb(rightHand, new Vector2(
                        handPos.X + (float)Math.Sin(handCyclePos / 1.5f) * wobbleAmount,
                        handPos.Y + (float)Math.Sin(handCyclePos / 3.5f) * wobbleAmount - 0.25f), 1.5f);
                }

                if (!leftHand.Disabled)
                {
                    MoveLimb(leftHand, new Vector2(
                        handPos.X + (float)Math.Sin(handCyclePos / 2.0f) * wobbleAmount,
                        handPos.Y + (float)Math.Sin(handCyclePos / 3.0f) * wobbleAmount - 0.25f), 1.5f);
                }

                return;
            }

            handPos += head.LinearVelocity * 0.1f;

            // Not sure why the params has to be flipped, but it works.
            var handMoveAmount = CurrentSwimParams.HandMoveAmount.Flip();
            var handMoveOffset = CurrentSwimParams.HandMoveOffset.Flip();
            float handPosX = (float)Math.Cos(handCyclePos) * handMoveAmount.X * CurrentAnimationParams.CycleSpeed;
            float handPosY = (float)Math.Sin(handCyclePos) * handMoveAmount.Y * CurrentAnimationParams.CycleSpeed;

            Matrix rotationMatrix = Matrix.CreateRotationZ(torso.Rotation);

            if (!rightHand.Disabled)
            {
                Vector2 rightHandPos = new Vector2(-handPosX, -handPosY) + handMoveOffset;
                rightHandPos.X = (Dir == 1.0f) ? Math.Max(0.3f, rightHandPos.X) : Math.Min(-0.3f, rightHandPos.X);
                rightHandPos = Vector2.Transform(rightHandPos, rotationMatrix);

                HandIK(rightHand, handPos + rightHandPos, CurrentSwimParams.HandMoveStrength);
            }

            if (!leftHand.Disabled)
            {
                Vector2 leftHandPos = new Vector2(handPosX, handPosY) + handMoveOffset;
                leftHandPos.X = (Dir == 1.0f) ? Math.Max(0.3f, leftHandPos.X) : Math.Min(-0.3f, leftHandPos.X);
                leftHandPos = Vector2.Transform(leftHandPos, rotationMatrix);

                HandIK(leftHand, handPos + leftHandPos, CurrentSwimParams.HandMoveStrength);
            }
        }

        private float prevFootPos;

        void UpdateClimbing()
        {
            if (character.SelectedConstruction == null || character.SelectedConstruction.GetComponent<Ladder>() == null)
            {
                Anim = Animation.None;
                return;
            }

            onGround = false;
            IgnorePlatforms = true;

            Vector2 tempTargetMovement = TargetMovement;
            tempTargetMovement.Y = Math.Min(tempTargetMovement.Y, 1.0f);

            bool slide = targetMovement.Y < -1.1f;

            movement = MathUtils.SmoothStep(movement, tempTargetMovement, 0.3f);

            Limb leftFoot = GetLimb(LimbType.LeftFoot);
            Limb rightFoot = GetLimb(LimbType.RightFoot);
            Limb head = GetLimb(LimbType.Head);
            Limb torso = GetLimb(LimbType.Torso);

            Limb waist = GetLimb(LimbType.Waist);

            Limb leftHand = GetLimb(LimbType.LeftHand);
            Limb rightHand = GetLimb(LimbType.RightHand);

            Vector2 ladderSimPos = ConvertUnits.ToSimUnits(
                character.SelectedConstruction.Rect.X + character.SelectedConstruction.Rect.Width / 2.0f,
                character.SelectedConstruction.Rect.Y);

            float stepHeight = ConvertUnits.ToSimUnits(30.0f);

            if (currentHull == null && character.SelectedConstruction.Submarine != null)
            {
                ladderSimPos += character.SelectedConstruction.Submarine.SimPosition;
            }
            else if (currentHull.Submarine != null && currentHull.Submarine != character.SelectedConstruction.Submarine)
            {
                ladderSimPos += character.SelectedConstruction.Submarine.SimPosition - currentHull.Submarine.SimPosition;
            }

            float bottomPos = Collider.SimPosition.Y - ColliderHeightFromFloor - Collider.radius - Collider.height / 2.0f;

            MoveLimb(head, new Vector2(ladderSimPos.X - 0.27f * Dir, bottomPos + WalkParams.HeadPosition), 10.5f);
            MoveLimb(torso, new Vector2(ladderSimPos.X - 0.27f * Dir, bottomPos + WalkParams.TorsoPosition), 10.5f);
            if (waist != null)
            {
                //MoveLimb(waist, new Vector2(ladderSimPos.X - 0.35f * Dir, Collider.SimPosition.Y + 0.6f - ColliderHeightFromFloor), 10.5f);
            }

            Collider.MoveToPos(new Vector2(ladderSimPos.X - 0.2f * Dir, Collider.SimPosition.Y), 10.5f);            
            
            Vector2 handPos = new Vector2(
                ladderSimPos.X,
                bottomPos + WalkParams.TorsoPosition + movement.Y * 0.1f - ladderSimPos.Y);

            //prevent the hands from going above the top of the ladders
            handPos.Y = Math.Min(-0.5f, handPos.Y);

            // TODO: lock only one hand when aiming?
            if (!PlayerInput.KeyDown(InputType.Aim) || Math.Abs(movement.Y) > 0.01f)
            {
                MoveLimb(leftHand,
                    new Vector2(handPos.X,
                    (slide ? handPos.Y : MathUtils.Round(handPos.Y - stepHeight, stepHeight * 2.0f) + stepHeight) + ladderSimPos.Y),
                    5.2f);

                MoveLimb(rightHand,
                    new Vector2(handPos.X,
                    (slide ? handPos.Y : MathUtils.Round(handPos.Y, stepHeight * 2.0f)) + ladderSimPos.Y),
                    5.2f);

                leftHand.body.ApplyTorque(Dir * 2.0f);
                rightHand.body.ApplyTorque(Dir * 2.0f);
            }

            Vector2 footPos = new Vector2(
                handPos.X - Dir * 0.05f,
                bottomPos + ColliderHeightFromFloor - stepHeight * 2.7f - ladderSimPos.Y);
            
            if (slide)
            {
                MoveLimb(leftFoot, new Vector2(footPos.X, footPos.Y + ladderSimPos.Y), 15.5f, true);
                MoveLimb(rightFoot, new Vector2(footPos.X, footPos.Y + ladderSimPos.Y), 15.5f, true);
            }
            else
            {
                float leftFootPos = MathUtils.Round(footPos.Y + stepHeight, stepHeight * 2.0f) - stepHeight;
                float prevLeftFootPos = MathUtils.Round(prevFootPos + stepHeight, stepHeight * 2.0f) - stepHeight;
                MoveLimb(leftFoot, new Vector2(footPos.X, leftFootPos + ladderSimPos.Y), 15.5f, true);

                float rightFootPos = MathUtils.Round(footPos.Y, stepHeight * 2.0f);
                float prevRightFootPos = MathUtils.Round(prevFootPos, stepHeight * 2.0f);
                MoveLimb(rightFoot, new Vector2(footPos.X, rightFootPos + ladderSimPos.Y), 15.5f, true);
#if CLIENT
                if (Math.Abs(leftFootPos - prevLeftFootPos) > stepHeight && leftFoot.LastImpactSoundTime < Timing.TotalTime - Limb.SoundInterval)
                {
                    SoundPlayer.PlaySound("footstep_armor_heavy", volume: 0.5f, range: 500.0f, position: leftFoot.WorldPosition);
                    leftFoot.LastImpactSoundTime = (float)Timing.TotalTime;
                }
                if (Math.Abs(rightFootPos - prevRightFootPos) > stepHeight && rightFoot.LastImpactSoundTime < Timing.TotalTime - Limb.SoundInterval)
                {
                    SoundPlayer.PlaySound("footstep_armor_heavy", volume: 0.5f, range: 500.0f, position: rightFoot.WorldPosition);
                    rightFoot.LastImpactSoundTime = (float)Timing.TotalTime;
                }
#endif
                prevFootPos = footPos.Y;
            }            

            //apply torque to the legs to make the knees bend
            Limb leftLeg = GetLimb(LimbType.LeftLeg);
            Limb rightLeg = GetLimb(LimbType.RightLeg);

            leftLeg.body.ApplyTorque(Dir * -8.0f);
            rightLeg.body.ApplyTorque(Dir * -8.0f);

            float movementFactor = (handPos.Y / stepHeight) * (float)Math.PI;
            movementFactor = 0.8f + (float)Math.Abs(Math.Sin(movementFactor));

            Vector2 subSpeed = currentHull != null || character.SelectedConstruction.Submarine == null
                ? Vector2.Zero : character.SelectedConstruction.Submarine.Velocity;

            Vector2 climbForce = new Vector2(0.0f, movement.Y + 0.3f) * movementFactor;
            if (character.SimPosition.Y > ladderSimPos.Y) { climbForce.Y = Math.Min(0.0f, climbForce.Y); }

            //apply forces to the collider to move the Character up/down
            Collider.ApplyForce((climbForce * 20.0f + subSpeed * 50.0f) * Collider.Mass, maxVelocity: NetConfig.MaxPhysicsBodyVelocity);
            head.body.SmoothRotate(0.0f);
            
            if (!character.SelectedConstruction.Prefab.Triggers.Any())
            {
                character.SelectedConstruction = null;
                return;
            }

            Rectangle trigger = character.SelectedConstruction.Prefab.Triggers.FirstOrDefault();
            trigger = character.SelectedConstruction.TransformTrigger(trigger);

            bool notClimbing = false;

            bool isNotRemote = true;
            if (GameMain.NetworkMember != null && GameMain.NetworkMember.IsClient) isNotRemote = !character.IsRemotePlayer;

            if (isNotRemote)
            {
                notClimbing = character.IsKeyDown(InputType.Left) || character.IsKeyDown(InputType.Right);
            }
            else
            {
                notClimbing = Math.Abs(targetMovement.X) > 0.05f ||
                (TargetMovement.Y < 0.0f && ConvertUnits.ToSimUnits(trigger.Height) + handPos.Y < HeadPosition) ||
                (TargetMovement.Y > 0.0f && handPos.Y > 0.1f);
            }

            if (notClimbing)
            {
                Anim = Animation.None;
                character.SelectedConstruction = null;
                IgnorePlatforms = false;
            }
        }

        void UpdateDying(float deltaTime)
        {
            //the force/torque used to move the limbs goes from 1 to 0 during the death anim duration
            float strength = 1.0f - deathAnimTimer / deathAnimDuration;

            Limb head = GetLimb(LimbType.Head);
            Limb torso = GetLimb(LimbType.Torso);
            
            //if the head is moving, try to protect it with the hands
            if (head.LinearVelocity.LengthSquared() > 1.0f && !head.IsSevered)
            {
                Limb leftHand = GetLimb(LimbType.LeftHand);
                Limb rightHand = GetLimb(LimbType.RightHand);

                //move hands in front of the head in the direction of the movement
                Vector2 protectPos = head.SimPosition + Vector2.Normalize(head.LinearVelocity);
                if (!rightHand.IsSevered) HandIK(rightHand, protectPos, strength * 0.1f);
                if (!leftHand.IsSevered) HandIK(leftHand, protectPos, strength * 0.1f);
            }

            //attempt to make legs stay in a straight line with the torso to prevent the character from doing a split
            for (int i = 0; i < 2; i++)
            {
                var thigh = i == 0 ? GetLimb(LimbType.LeftThigh) : GetLimb(LimbType.RightThigh);
                if (thigh.IsSevered) continue;

                float thighDiff = Math.Abs(MathUtils.GetShortestAngle(torso.Rotation, thigh.Rotation));
                float thighTorque = thighDiff * thigh.Mass * Math.Sign(torso.Rotation - thigh.Rotation) * 5.0f;
                thigh.body.ApplyTorque(thighTorque * strength);                

                var leg = i == 0 ? GetLimb(LimbType.LeftLeg) : GetLimb(LimbType.RightLeg);
                if (leg.IsSevered) continue;
                float legDiff = Math.Abs(MathUtils.GetShortestAngle(torso.Rotation, leg.Rotation));
                float legTorque = legDiff * leg.Mass * Math.Sign(torso.Rotation - leg.Rotation) * 5.0f;
                leg.body.ApplyTorque(legTorque * strength);                
            }
        }

        private float lastReviveTime;

        private void UpdateCPR(float deltaTime)
        {
            if (character.SelectedCharacter == null || 
                (!character.SelectedCharacter.IsUnconscious && !character.SelectedCharacter.IsDead && character.SelectedCharacter.Stun <= 0.0f))
            {
                Anim = Animation.None;
                return;
            }

            Character target = character.SelectedCharacter;

            Crouching = true;

            Vector2 diff = target.SimPosition - character.SimPosition;
            Limb targetHead = target.AnimController.GetLimb(LimbType.Head);
            Limb targetTorso = target.AnimController.GetLimb(LimbType.Torso);
            if (targetTorso == null)
            {
                Anim = Animation.None;
                return;
            }

            Limb head = GetLimb(LimbType.Head);
            Limb torso = GetLimb(LimbType.Torso);
            
            Vector2 headDiff = targetHead == null ? diff : targetHead.SimPosition - character.SimPosition;
            targetMovement = new Vector2(diff.X, 0.0f);
            TargetDir = headDiff.X > 0.0f ? Direction.Right : Direction.Left;

            UpdateStanding();

            Vector2 handPos = targetTorso.SimPosition + Vector2.UnitY * 0.2f;

            Grab(handPos, handPos);

            Vector2 colliderPos = GetColliderBottom();

            bool wasCritical = target.Vitality < 0.0f;
            
            if (GameMain.NetworkMember == null || !GameMain.NetworkMember.IsClient) //Serverside code
            {
                target.Oxygen += deltaTime * 0.5f; //Stabilize them        
            }
           
            int skill = (int)character.GetSkillLevel("medical");
            //pump for 15 seconds (cprAnimTimer 0-15), then do mouth-to-mouth for 2 seconds (cprAnimTimer 15-17)
            if (cprAnimTimer > 15.0f && targetHead != null && head != null)
            {
                float yPos = (float)Math.Sin(cprAnimTimer) * 0.2f;
                head.PullJointWorldAnchorB = new Vector2(targetHead.SimPosition.X, targetHead.SimPosition.Y + 0.3f + yPos);
                head.PullJointEnabled = true;
                torso.PullJointWorldAnchorB = new Vector2(torso.SimPosition.X, colliderPos.Y + (TorsoPosition.Value - 0.2f));
                torso.PullJointEnabled = true;

                //Serverside code
                if (GameMain.NetworkMember == null || !GameMain.NetworkMember.IsClient)
                {
                    if (target.Oxygen < -10.0f)
                    {
                        //stabilize the oxygen level but don't allow it to go positive and revive the character yet
                        float stabilizationAmount = skill * CPRSettings.StabilizationPerSkill;
                        stabilizationAmount = MathHelper.Clamp(stabilizationAmount, CPRSettings.StabilizationMin, CPRSettings.StabilizationMax);
                        character.Oxygen -= (1.0f / stabilizationAmount) * deltaTime; //Worse skill = more oxygen required
                        if (character.Oxygen > 0.0f) target.Oxygen += stabilizationAmount * deltaTime; //we didn't suffocate yet did we    

                        //DebugConsole.NewMessage("CPR Us: " + character.Oxygen + " Them: " + target.Oxygen + " How good we are: restore " + cpr + " use " + (30.0f - cpr), Color.Aqua);
                    }
                }
            }
            else
            {
                if (targetHead != null && head != null)
                {
                    head.PullJointWorldAnchorB = new Vector2(targetHead.SimPosition.X, targetHead.SimPosition.Y + 0.8f);
                    head.PullJointEnabled = true;
                }

                torso.PullJointWorldAnchorB = new Vector2(torso.SimPosition.X, colliderPos.Y + (TorsoPosition.Value - 0.1f));
                torso.PullJointEnabled = true;

                if (cprPump >= 1)
                {
                    torso.body.ApplyLinearImpulse(new Vector2(0, -20f), maxVelocity: NetConfig.MaxPhysicsBodyVelocity);
                    targetTorso.body.ApplyLinearImpulse(new Vector2(0, -20f), maxVelocity: NetConfig.MaxPhysicsBodyVelocity);
                    cprPump = 0;

                    if (skill < CPRSettings.DamageSkillThreshold)
                    {
                        target.LastDamageSource = null;
                        target.DamageLimb(
                            targetTorso.WorldPosition, targetTorso, 
                            new List<Affliction>()
                            {
                                AfflictionPrefab.InternalDamage.Instantiate((CPRSettings.DamageSkillThreshold - skill) * CPRSettings.DamageSkillMultiplier,
                                source: character)
                            },
                            0.0f, true, 0.0f, character);
                    }
                    if (GameMain.NetworkMember == null || !GameMain.NetworkMember.IsClient) //Serverside code
                    {
                        float reviveChance = skill * CPRSettings.ReviveChancePerSkill;
                        reviveChance = (float)Math.Pow(reviveChance, CPRSettings.ReviveChanceExponent);
                        reviveChance = MathHelper.Clamp(reviveChance, CPRSettings.ReviveChanceMin, CPRSettings.ReviveChanceMax);

                        if (Rand.Range(0.0f, 1.0f, Rand.RandSync.Server) <= reviveChance)
                        {
                            //increase oxygen and clamp it above zero 
                            // -> the character should be revived if there are no major afflictions in addition to lack of oxygen
                            target.Oxygen = Math.Max(target.Oxygen + 10.0f, 10.0f);
                        }
                    }
                }
                cprPump += deltaTime;
            }

            cprAnimTimer = (cprAnimTimer + deltaTime) % 17;

            //got the character back into a non-critical state, increase medical skill
            //BUT only if it has been more than 10 seconds since the character revived someone
            //otherwise it's easy to abuse the system by repeatedly reviving in a low-oxygen room 
            if (!target.IsDead)
            {
                target.CharacterHealth.CalculateVitality();
                if (wasCritical && target.Vitality > 0.0f && Timing.TotalTime > lastReviveTime + 10.0f)
                {
                    character.Info.IncreaseSkillLevel("medical", 0.5f, character.WorldPosition + Vector2.UnitY * 150.0f);
                    SteamAchievementManager.OnCharacterRevived(target, character);
                    lastReviveTime = (float)Timing.TotalTime;
                    //reset attacker, we don't want the character to start attacking us
                    //because we caused a bit of damage to them during CPR
                    if (target.LastAttacker == character) target.LastAttacker = null;
                }
            }
        }

        public override void DragCharacter(Character target, float deltaTime)
        {
            if (target == null) return;

            Limb torso = GetLimb(LimbType.Torso);
            Limb leftHand = GetLimb(LimbType.LeftHand);
            Limb rightHand = GetLimb(LimbType.RightHand);

            Limb targetLeftHand = target.AnimController.GetLimb(LimbType.LeftHand);
            if (targetLeftHand == null) targetLeftHand = target.AnimController.GetLimb(LimbType.Torso);
            if (targetLeftHand == null) targetLeftHand = target.AnimController.MainLimb;

            Limb targetRightHand = target.AnimController.GetLimb(LimbType.RightHand);
            if (targetRightHand == null) targetRightHand = target.AnimController.GetLimb(LimbType.Torso);
            if (targetRightHand == null) targetRightHand = target.AnimController.MainLimb;

            if (!target.AllowInput)
            {
                target.AnimController.ResetPullJoints();
            }

            if (Anim == Animation.Climbing)
            {
                //cannot drag up ladders if the character is conscious
                if (target.AllowInput && (GameMain.NetworkMember == null || !GameMain.NetworkMember.IsClient))
                {
                    character.DeselectCharacter();
                    return;
                }
                Limb targetTorso = target.AnimController.GetLimb(LimbType.Torso);
                if (targetTorso == null) targetTorso = target.AnimController.MainLimb;

                if (target.AnimController.Dir != Dir)
                    target.AnimController.Flip();

                Vector2 transformedTorsoPos = torso.SimPosition;
                if (character.Submarine == null && target.Submarine != null)
                {
                    transformedTorsoPos -= target.Submarine.SimPosition;
                }
                else if (character.Submarine != null && target.Submarine == null)
                {
                    transformedTorsoPos += character.Submarine.SimPosition;
                }
                else if (character.Submarine != null && target.Submarine != null && character.Submarine != target.Submarine)
                {
                    transformedTorsoPos += character.Submarine.SimPosition;
                    transformedTorsoPos -= target.Submarine.SimPosition;
                }

                targetTorso.PullJointEnabled = true;
                targetTorso.PullJointWorldAnchorB = transformedTorsoPos + (Vector2.UnitX * -Dir) * 0.2f;
                targetTorso.PullJointMaxForce = 5000.0f;

                if (!targetLeftHand.IsSevered)
                {
                    targetLeftHand.PullJointEnabled = true;
                    targetLeftHand.PullJointWorldAnchorB = transformedTorsoPos + (new Vector2(1 * Dir, 1)) * 0.2f;
                    targetLeftHand.PullJointMaxForce = 5000.0f;
                }
                if (!targetRightHand.IsSevered)
                {
                    targetRightHand.PullJointEnabled = true;
                    targetRightHand.PullJointWorldAnchorB = transformedTorsoPos + (new Vector2(1 * Dir, 1)) * 0.2f;
                    targetRightHand.PullJointMaxForce = 5000.0f;
                }

                if (GameMain.NetworkMember != null && GameMain.NetworkMember.IsClient)
                {
                    Collider.ResetDynamics();
                }

                target.AnimController.IgnorePlatforms = true;
            }
            else
            {
                //only grab with one hand when swimming
                leftHand.Disabled = true;
                if (!inWater) rightHand.Disabled = true;

                for (int i = 0; i < 2; i++)
                {
                    Limb targetLimb = target.AnimController.GetLimb(LimbType.Torso);
                    if (i == 0)
                    {
                        if (!targetLeftHand.IsSevered)
                        {
                            targetLimb = targetLeftHand;
                        }
                        else if (!targetRightHand.IsSevered)
                        {
                            targetLimb = targetRightHand;
                        }
                    }
                    else
                    {
                        if (!targetRightHand.IsSevered)
                        {
                            targetLimb = targetRightHand;
                        }
                        else if (!targetLeftHand.IsSevered)
                        {
                            targetLimb = targetLeftHand;
                        }
                    }

                    Limb pullLimb = i == 0 ? leftHand : rightHand;

                    if (GameMain.NetworkMember == null || !GameMain.NetworkMember.IsClient)
                    {
                        //stop dragging if there's something between the pull limb and the target limb
                        Vector2 sourceSimPos = pullLimb.SimPosition;
                        Vector2 targetSimPos = targetLimb.SimPosition;
                        if (character.Submarine != null && character.SelectedCharacter.Submarine == null)
                        {
                            targetSimPos -= character.Submarine.SimPosition;
                        }
                        else if (character.Submarine == null && character.SelectedCharacter.Submarine != null)
                        {
                            sourceSimPos -= character.SelectedCharacter.Submarine.SimPosition;
                        }
                        var body = Submarine.CheckVisibility(sourceSimPos, targetSimPos, ignoreSubs: true);
                        if (body != null)
                        {
                            character.DeselectCharacter();
                            return;
                        }
                    }

                    //only pull with one hand when swimming
                    if (i > 0 && inWater) continue;
                    
                    Vector2 diff = ConvertUnits.ToSimUnits(targetLimb.WorldPosition - pullLimb.WorldPosition);

                    Vector2 targetAnchor = targetLimb.SimPosition;
                    float targetForce = 0.0f;
                    pullLimb.PullJointEnabled = true;
                    if (targetLimb.type == LimbType.Torso || targetLimb == target.AnimController.MainLimb)
                    {
                        Vector2 pullLimbAnchor = targetLimb.SimPosition;
                        pullLimb.PullJointMaxForce = 5000.0f;
                        targetMovement *= MathHelper.Clamp(Mass / target.Mass, 0.5f, 1.0f);
                            
                        Vector2 shoulderPos = shoulder.WorldAnchorA;
                        Vector2 dragDir = inWater ? Vector2.Normalize(targetLimb.SimPosition - shoulderPos) : Vector2.UnitY;

                        targetAnchor = shoulderPos - dragDir * ConvertUnits.ToSimUnits(upperArmLength + forearmLength);
                        targetForce = 200.0f;
                        if (target.Submarine != character.Submarine)
                        {
                            if (character.Submarine == null)
                            {
                                pullLimbAnchor += target.Submarine.SimPosition;
                                targetAnchor -= target.Submarine.SimPosition;
                            }
                            else if (target.Submarine == null)
                            {
                                pullLimbAnchor -= character.Submarine.SimPosition;
                                targetAnchor += character.Submarine.SimPosition;
                            }
                            else
                            {
                                pullLimbAnchor -= target.Submarine.SimPosition;
                                pullLimbAnchor += character.Submarine.SimPosition;
                                targetAnchor -= character.Submarine.SimPosition;
                                targetAnchor += target.Submarine.SimPosition;
                            }
                        }
                        pullLimb.PullJointWorldAnchorB = pullLimbAnchor;
                    }
                    else
                    {
                        pullLimb.PullJointWorldAnchorB = pullLimb.SimPosition + diff;
                        pullLimb.PullJointMaxForce = 5000.0f;
                        targetAnchor = targetLimb.SimPosition - diff;
                        targetForce = 5000.0f;
                    }

                    if (!target.AllowInput)
                    {
                        targetLimb.PullJointEnabled = true;
                        targetLimb.PullJointMaxForce = targetForce;
                        targetLimb.PullJointWorldAnchorB = targetAnchor;
                    }

                    target.AnimController.movement = -diff;
                }

                float dist = ConvertUnits.ToSimUnits(Vector2.Distance(target.WorldPosition, WorldPosition));
                //let the target break free if it's moving away and gets far enough
                if ((GameMain.NetworkMember == null || !GameMain.NetworkMember.IsClient) && dist > 1.4f && target.AllowInput &&
                    Vector2.Dot(target.WorldPosition - WorldPosition, target.AnimController.TargetMovement) > 0)
                {
                    character.DeselectCharacter();
                    return;
                }

                //limit movement if moving away from the target
                if (Vector2.Dot(target.WorldPosition - WorldPosition, targetMovement) < 0)
                {
                    targetMovement *= MathHelper.Clamp(1.5f - dist, 0.0f, 1.0f);
                }
                
                if (!target.AllowInput)
                {
                    target.AnimController.IgnorePlatforms = IgnorePlatforms;
                    target.AnimController.TargetMovement = TargetMovement;
                }
                else if (target is AICharacter && target != Character.Controlled)
                {
                    target.AnimController.TargetDir = WorldPosition.X > target.WorldPosition.X ? Direction.Right : Direction.Left;
                    target.AnimController.TargetMovement = (character.SimPosition + Vector2.UnitX * Dir) - target.SimPosition;
                }
            }
        }

        public void Grab(Vector2 rightHandPos, Vector2 leftHandPos)
        {
            for (int i = 0; i < 2; i++)
            {
                Limb pullLimb = (i == 0) ? GetLimb(LimbType.LeftHand) : GetLimb(LimbType.RightHand);

                pullLimb.Disabled = true;

                pullLimb.PullJointEnabled = true;
                pullLimb.PullJointWorldAnchorB = (i == 0) ? rightHandPos : leftHandPos;
                pullLimb.PullJointMaxForce = 500.0f;
            }
        }

        //TODO: refactor this method, it's way too convoluted
        public override void HoldItem(float deltaTime, Item item, Vector2[] handlePos, Vector2 holdPos, Vector2 aimPos, bool aim, float holdAngle, float itemAngleRelativeToHoldAngle = 0.0f)
        {
            if (character.IsUnconscious || character.Stun > 0.0f) aim = false;

            //calculate the handle positions
            Matrix itemTransfrom = Matrix.CreateRotationZ(item.body.Rotation);
            // TODO: don't create new arrays, reuse
            Vector2[] transformedHandlePos = new Vector2[2];
            transformedHandlePos[0] = Vector2.Transform(handlePos[0], itemTransfrom);
            transformedHandlePos[1] = Vector2.Transform(handlePos[1], itemTransfrom);

            Limb head = GetLimb(LimbType.Head);
            Limb torso = GetLimb(LimbType.Torso);
            Limb leftHand = GetLimb(LimbType.LeftHand);
            Limb rightHand = GetLimb(LimbType.RightHand);
            
            // TODO: Remove this. Provide the position in params.
            Vector2 itemPos = aim ? aimPos : holdPos;

            bool usingController = character.SelectedConstruction != null && character.SelectedConstruction.GetComponent<Controller>() != null;
            bool isClimbing = character.IsClimbing && Math.Abs(character.AnimController.TargetMovement.Y) > 0.01f;

            float itemAngle;

            Holdable holdable = item.GetComponent<Holdable>();

            if (!isClimbing && !usingController && character.Stun <= 0.0f && aim && itemPos != Vector2.Zero)
            {
                Vector2 mousePos = ConvertUnits.ToSimUnits(character.SmoothedCursorPosition);

                Vector2 diff = holdable.Aimable ? (mousePos - AimSourceSimPos) * Dir : Vector2.UnitX;

                holdAngle = MathUtils.VectorToAngle(new Vector2(diff.X, diff.Y * Dir)) - torso.body.Rotation * Dir;

                itemAngle = (torso.body.Rotation + holdAngle * Dir);
                
                if (holdable.ControlPose)
                {
                    head.body.SmoothRotate(itemAngle);

                    if (TargetMovement == Vector2.Zero && inWater)
                    {
                        torso.body.AngularVelocity -= torso.body.AngularVelocity * 0.1f;
                        torso.body.ApplyForce(torso.body.LinearVelocity * -0.5f);
                    }

                    aiming = true;
                }

            }
            else
            {
                itemAngle = (torso.body.Rotation + holdAngle * Dir);
            }

            Vector2 transformedHoldPos = shoulder.WorldAnchorA;
            if (itemPos == Vector2.Zero || isClimbing || usingController)
            {
                if (character.SelectedItems[0] == item)
                {
                    if (rightHand.IsSevered) return;
                    transformedHoldPos = rightHand.PullJointWorldAnchorA - transformedHandlePos[0];
                    itemAngle = (rightHand.Rotation + (holdAngle - MathHelper.PiOver2) * Dir);
                }
                else if (character.SelectedItems[1] == item)
                {
                    if (leftHand.IsSevered) return;
                    transformedHoldPos = leftHand.PullJointWorldAnchorA - transformedHandlePos[1];
                    itemAngle = (leftHand.Rotation + (holdAngle - MathHelper.PiOver2) * Dir);
                }
            }
            else
            {
                if (character.SelectedItems[0] == item)
                {
                    if (rightHand.IsSevered) return;
                    rightHand.Disabled = true;
                }
                if (character.SelectedItems[1] == item)
                {
                    if (leftHand.IsSevered) return;
                    leftHand.Disabled = true;
                }

                itemPos.X = itemPos.X * Dir;                
                transformedHoldPos += Vector2.Transform(itemPos, Matrix.CreateRotationZ(itemAngle));
            }

            item.body.ResetDynamics();

            Vector2 currItemPos = (character.SelectedItems[0] == item) ?
                rightHand.PullJointWorldAnchorA - transformedHandlePos[0] :
                leftHand.PullJointWorldAnchorA - transformedHandlePos[1];

            if (!MathUtils.IsValid(currItemPos))
            {
                string errorMsg = "Attempted to move the item \"" + item + "\" to an invalid position in HumanidAnimController.HoldItem: " +
                    currItemPos + ", rightHandPos: " + rightHand.PullJointWorldAnchorA + ", leftHandPos: " + leftHand.PullJointWorldAnchorA +
                    ", handlePos[0]: " + handlePos[0] + ", handlePos[1]: " + handlePos[1] +
                    ", transformedHandlePos[0]: " + transformedHandlePos[0] + ", transformedHandlePos[1]:" + transformedHandlePos[1] +
                    ", item pos: " + item.SimPosition + ", itemAngle: " + itemAngle +
                    ", collider pos: " + character.SimPosition;
                DebugConsole.Log(errorMsg);
                GameAnalyticsManager.AddErrorEventOnce(
                    "HumanoidAnimController.HoldItem:InvalidPos:" + character.Name + item.Name,
                    GameAnalyticsSDK.Net.EGAErrorSeverity.Error, 
                    errorMsg);

                return;
            }

            if (holdable.Pusher != null)
            {
                if (character.IsUnconscious || character.Stun > 0.0f)
                {
                    holdable.Pusher.Enabled = false;
                }
                else
                {
                    if (!holdable.Pusher.Enabled)
                    {
                        holdable.Pusher.Enabled = true;
                        holdable.Pusher.ResetDynamics();
                        holdable.Pusher.SetTransform(currItemPos, itemAngle);
                        foreach (Character character in Character.CharacterList)
                        {
                            holdable.Pusher.FarseerBody.RestoreCollisionWith(character.AnimController.Collider.FarseerBody);
                        }
                        holdable.Pusher.FarseerBody.IgnoreCollisionWith(Collider.FarseerBody);
                    }
                    else
                    {
                        holdable.Pusher.TargetPosition = currItemPos;
                        holdable.Pusher.TargetRotation = character.IsUnconscious || character.Stun > 0.0f ? itemAngle : holdAngle * Dir;

                        holdable.Pusher.MoveToTargetPosition(true);

                        currItemPos = holdable.Pusher.SimPosition;
                        itemAngle = holdable.Pusher.Rotation;
                    }
                }
            }

            item.SetTransform(currItemPos, itemAngle + itemAngleRelativeToHoldAngle * Dir);

            if (!isClimbing)
            {
                for (int i = 0; i < 2; i++)
                {
                    if (character.SelectedItems[i] != item) continue;
                    if (itemPos == Vector2.Zero) continue;

                    Limb hand = (i == 0) ? rightHand : leftHand;

                    HandIK(hand, transformedHoldPos + transformedHandlePos[i]);
                }
            }
        }

        private void HandIK(Limb hand, Vector2 pos, float force = 1.0f)
        {
            if (shoulder == null) { return; }
            Vector2 shoulderPos = shoulder.WorldAnchorA;

            Limb arm, forearm;
            if (hand.type == LimbType.LeftHand)
            {
                arm = GetLimb(LimbType.LeftArm);
                forearm = GetLimb(LimbType.LeftForearm);
                LeftHandIKPos = pos;
            }
            else
            {
                arm = GetLimb(LimbType.RightArm);
                forearm = GetLimb(LimbType.RightForearm);
                RightHandIKPos = pos;
            }

            //distance from shoulder to holdpos
            float c = Vector2.Distance(pos, shoulderPos);
            c = MathHelper.Clamp(c, Math.Abs(upperArmLength - forearmLength), forearmLength + upperArmLength - 0.01f);

            float armAngle = MathUtils.VectorToAngle(pos - shoulderPos) + MathHelper.PiOver2;

            float upperArmAngle = MathUtils.SolveTriangleSSS(forearmLength, upperArmLength, c) * Dir;
            float lowerArmAngle = MathUtils.SolveTriangleSSS(upperArmLength, forearmLength, c) * Dir;
            
            //make sure the arm angle "has the same number of revolutions" as the arm
            while (arm.Rotation - armAngle > MathHelper.Pi)
            {
                armAngle += MathHelper.TwoPi;
            }
            while (arm.Rotation - armAngle < -MathHelper.Pi)
            {
                armAngle -= MathHelper.TwoPi;
            }

            arm?.body.SmoothRotate((armAngle - upperArmAngle), 20.0f * force * arm.Mass, wrapAngle: false);
            forearm?.body.SmoothRotate((armAngle + lowerArmAngle), 20.0f * force * forearm.Mass, wrapAngle: false);
            hand?.body.SmoothRotate((armAngle + lowerArmAngle), 100.0f * force * hand.Mass, wrapAngle: false);
        }

        private void FootIK(Limb foot, Vector2 pos, float legTorque, float footTorque, float footAngle)
        {
            Limb upperLeg, lowerLeg;
            if (foot.type == LimbType.LeftFoot)
            {
                upperLeg = GetLimb(LimbType.LeftThigh);
                lowerLeg = GetLimb(LimbType.LeftLeg);
            }
            else
            {
                upperLeg = GetLimb(LimbType.RightThigh);
                lowerLeg = GetLimb(LimbType.RightLeg);
            }
            var torso = GetLimb(LimbType.Torso);
            var waist = GetJointBetweenLimbs(LimbType.Waist, upperLeg.type);
            Vector2 waistPos = waist.LimbA == upperLeg ? waist.WorldAnchorA : waist.WorldAnchorB;

            //distance from waist joint to the target position
            float c = Vector2.Distance(pos, waistPos);
            c = Math.Max(c, Math.Abs(upperLegLength - lowerLegLength));

            float legAngle = MathUtils.VectorToAngle(pos - waistPos) + MathHelper.PiOver2;
            if (!MathUtils.IsValid(legAngle))
            {
                string errorMsg = "Invalid leg angle (" + legAngle + ") in FootIK. Waist pos: " + waistPos + ", target pos: " + pos;
                DebugConsole.ThrowError(errorMsg);
                GameAnalyticsManager.AddErrorEventOnce("FootIK:InvalidAngle", GameAnalyticsSDK.Net.EGAErrorSeverity.Error, errorMsg);
                return;
            }

            //make sure the angle "has the same number of revolutions" as the torso
            //(e.g. we don't want to rotate the legs to 0 if the torso is at 360, because that'd blow up the hip joints) 
            while (torso.Rotation - legAngle > MathHelper.Pi)
            {
                legAngle += MathHelper.TwoPi;
            }
            while (torso.Rotation - legAngle < -MathHelper.Pi)
            {
                legAngle -= MathHelper.TwoPi;
            }
            
            //if the distance is longer than the length of the upper and lower leg, we'll just have to extend them directly towards the target
            float upperLegAngle = c >= upperLegLength + lowerLegLength ? 0.0f : MathUtils.SolveTriangleSSS(lowerLegLength, upperLegLength, c);
            float lowerLegAngle = c >= upperLegLength + lowerLegLength ? 0.0f : MathUtils.SolveTriangleSSS(upperLegLength, lowerLegLength, c);

            upperLeg.body.SmoothRotate((legAngle + upperLegAngle * Dir), upperLeg.Mass * legTorque, wrapAngle: false);
            lowerLeg.body.SmoothRotate((legAngle - lowerLegAngle * Dir), lowerLeg.Mass * legTorque, wrapAngle: false);
            foot.body.SmoothRotate((legAngle - (lowerLegAngle + footAngle) * Dir), foot.Mass * footTorque, wrapAngle: false);
        }

        public override void UpdateUseItem(bool allowMovement, Vector2 handWorldPos)
        {
            var leftHand = GetLimb(LimbType.LeftHand);
            var rightHand = GetLimb(LimbType.RightHand);

            useItemTimer = 0.5f;
            Anim = Animation.UsingConstruction;

            if (!allowMovement)
            {
                TargetMovement = Vector2.Zero;
                TargetDir = handWorldPos.X > character.WorldPosition.X ? Direction.Right : Direction.Left;
                float sqrDist = Vector2.DistanceSquared(character.WorldPosition, handWorldPos);
                if (sqrDist > MathUtils.Pow(ConvertUnits.ToDisplayUnits(upperArmLength + forearmLength), 2))
                {
                    TargetMovement = Vector2.Normalize(handWorldPos - character.WorldPosition) * GetCurrentSpeed(false);
                }
            }

            if (!character.Enabled) { return; }

            Vector2 handSimPos = ConvertUnits.ToSimUnits(handWorldPos);
            if (character.Submarine != null)
            {
                handSimPos -= character.Submarine.SimPosition;
            }

            leftHand.Disabled = true;
            leftHand.PullJointEnabled = true;
            leftHand.PullJointWorldAnchorB = handSimPos;

            rightHand.Disabled = true;
            rightHand.PullJointEnabled = true;
            rightHand.PullJointWorldAnchorB = handSimPos;
        }

        public override void Flip()
        {
            base.Flip();

            WalkPos = -WalkPos;

            Limb torso = GetLimb(LimbType.Torso);

            Vector2 difference;

            Matrix torsoTransform = Matrix.CreateRotationZ(torso.Rotation);

            for (int i = 0; i < character.SelectedItems.Length; i++)
            {
                if (i == 1 && character.SelectedItems[0] == character.SelectedItems[1])
                {
                    break;
                }
                if (character.SelectedItems[i]?.body != null && !character.SelectedItems[i].Removed)
                {
                    character.SelectedItems[i].body.SetTransform(
                        character.SelectedItems[i].body.SimPosition,
                        MathUtils.WrapAngleTwoPi(character.SelectedItems[i].body.Rotation + MathHelper.Pi));
                    character.SelectedItems[i].GetComponent<Holdable>()?.Flip();
                }
            }

            foreach (Limb limb in Limbs)
            {
                bool mirror = false;
                bool flipAngle = false;
                bool wrapAngle = false;

                switch (limb.type)
                {
                    case LimbType.LeftHand:
                    case LimbType.LeftArm:
                    case LimbType.LeftForearm:
                    case LimbType.RightHand:
                    case LimbType.RightArm:
                    case LimbType.RightForearm:
                        flipAngle = true;
                        break;
                    case LimbType.LeftThigh:
                    case LimbType.LeftLeg:
                    case LimbType.LeftFoot:
                    case LimbType.RightThigh:
                    case LimbType.RightLeg:
                    case LimbType.RightFoot:
                        mirror = Crouching && !inWater;
                        flipAngle = (limb.DoesFlip || Crouching) && !inWater;
                        wrapAngle = !inWater;
                        break;
                    default:
                        flipAngle = limb.DoesFlip && !inWater;
                        wrapAngle = !inWater;
                        break;
                }

                Vector2 position = limb.SimPosition;

                if (!limb.PullJointEnabled && mirror)
                {
                    difference = limb.body.SimPosition - torso.SimPosition;
                    difference = Vector2.Transform(difference, torsoTransform);
                    difference.Y = -difference.Y;

                    position = torso.SimPosition + Vector2.Transform(difference, -torsoTransform);

                    //TrySetLimbPosition(limb, limb.SimPosition, );
                }

                float angle = flipAngle ? -limb.body.Rotation : limb.body.Rotation;
                if (wrapAngle) angle = MathUtils.WrapAnglePi(angle);
                
                TrySetLimbPosition(limb, Collider.SimPosition, position);

                limb.body.SetTransform(limb.body.SimPosition, angle);
            }
        }

    }
}