Net.Like.Xue.Tokyo/Packages-Local/Com.Project.B.Unity/Npc/NpcCharacterStates.cs

using BITKit.StateMachine;
using Project.B.CharacterController;
using Unity.Mathematics;
using UnityEngine;

namespace Net.Project.B.AI
{
    public abstract class NpcCharacterStates :ICharacterState
    {
        public virtual bool Enabled { get; set; }
        public virtual void Initialize()
        {
            
        }

        public virtual void OnStateEntry(IState old)
        {
        }

        public virtual void OnStateUpdate(float deltaTime)
        {
        }

        public virtual void OnStateExit(IState old, IState newState)
        {
        }

        public virtual void UpdateVelocity(ref float3 currentVelocity, float deltaTime)
        {
        }

        public virtual void UpdateRotation(ref float3 localPosition, ref quaternion currentRotation, ref quaternion viewRotation,
            float deltaTime)
        {
        }

        public virtual void BeforeUpdateVelocity(float deltaTime)
        {
        }

        public virtual void AfterUpdateVelocity(float deltaTime)
        {
        }
    }

    public abstract class NpcCharacterMotionState:NpcCharacterStates
    {
        protected readonly NpcCharacterController Self;
        protected NpcCharacterMotionState(NpcCharacterController self)
        {
            Self = self;
        }

        public override void UpdateVelocity(ref float3 currentVelocity, float deltaTime)
        {
            currentVelocity =Vector3.ProjectOnPlane( Self.NavMeshAgentController.Velocity, Vector3.up);
        }

        public override void UpdateRotation(ref float3 localPosition, ref quaternion currentRotation, ref quaternion viewRotation,
            float deltaTime)
        {
            base.UpdateRotation(ref localPosition, ref currentRotation, ref viewRotation, deltaTime);
            while (Self.NavMeshAgentController.QueuedDeltaRotation.TryDequeue(out var deltaRotation))
            {
                currentRotation *= deltaRotation;
            }
        }
    }
    public class NpcCharacterStateIdle : NpcCharacterMotionState, ICharacterStateIdle
    {
        public NpcCharacterStateIdle(NpcCharacterController self) : base(self)
        {
            
        }

        public override void OnStateUpdate(float deltaTime)
        {
            if (!Self.Agent.pathPending && Self.Agent.remainingDistance > Self.Agent.stoppingDistance)
            {
                Self.TransitionState<ICharacterStateWalk>();
            }
        }
    }

    public class NpcCharacterStateWalk : NpcCharacterMotionState, ICharacterStateWalk
    {
        public NpcCharacterStateWalk(NpcCharacterController self) : base(self)
        {
        }

        public override void OnStateUpdate(float deltaTime)
        {
            base.OnStateUpdate(deltaTime);
            
            if (!Self.Agent.pathPending && Self.Agent.remainingDistance <= Self.Agent.stoppingDistance)
            {
                Self.TransitionState<ICharacterStateIdle>();
            }
        }

        public override void UpdateRotation(ref float3 localPosition, ref quaternion currentRotation,
            ref quaternion viewRotation,
            float deltaTime)
        {

            var vectors = Self.Agent.path.corners;
            
            base.UpdateRotation(ref localPosition, ref currentRotation, ref viewRotation, deltaTime);
            
            if (Self.AllowMovement.Allow && Self.Agent.remainingDistance>Self.Agent.stoppingDistance && Self.AllowMovement.Allow && vectors.Length > 1)
            {
                var target = vectors[1];
                
                var distance= Vector3.Distance(Self.Transform.position, target);

                if (distance < 1 &&vectors.Length > 2)
                {
                       target = vectors[2];
                }

                var dir = Vector3.ProjectOnPlane(target - Self.Transform.position, Vector3.up);

                var angle = Quaternion.Angle(Quaternion.LookRotation(dir), currentRotation);

                if (angle < 1) return;

                var rot = Quaternion.LookRotation(dir);

                rot = Quaternion.Lerp(currentRotation, rot, 8 * deltaTime);

                currentRotation = rot;
            }
            else
            {
                var dir =Vector3.ProjectOnPlane( Self.Agent.destination - (Vector3)Self.Position,Vector3.up);
                
                if(dir.sqrMagnitude<0.1f)return;
                
                currentRotation=Quaternion.Lerp(currentRotation, Quaternion.LookRotation(dir), 8 * deltaTime);
            }
        }
    }

    public class NpcCharacterStateAnimation : NpcCharacterMotionState,ICharacterStateAnimation
    {
        public NpcCharacterStateAnimation(NpcCharacterController self) : base(self)
        {
        }

        public bool AllowCollision { get; set; }
    }
}