OldBlueWater/BlueWater/Assets/02.Scripts/Npc/NpcStateMachine.cs

using System.Collections;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.AI;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public class NpcStateMachine : MonoBehaviour
    {
        public NavMeshAgent Agent { get; set; }
        public INpcState CurrentState { get; private set; }
        public NpcStateContext Context { get; private set; } = new NpcStateContext();
        private Coroutine coroutine;

        public void ChangeState(INpcState newState)
        {
            ClonePreviousState();
            StopCoroutines();
            CurrentState?.OnExit(this);
            CurrentState = newState;
            CurrentState.OnEnter(this);
        }
        
        public void Update()
        {
            CurrentState?.OnUpdate(this);
        }
        
        public void RestorePreviousState()
        {
            if (Context.PreviousState != null)
            {
                ChangeState(Context.PreviousState.Clone());

                if (Context.PreviousDestination.HasValue)
                {
                    Agent.destination = Context.PreviousDestination.Value; // 이전 목적지로 설정
                }
                else
                {
                    // 목적지가 없는 경우, 다른 처리를 수행하거나 그대로 둠
                }
            }
            else
            {
                // 이전 상태가 없거나 복제할 수 없는 경우, 기본 상태로 돌아가거나 다른 처리
                Debug.LogWarning("No previous state to restore.");
            }
        }
        
        public void StartWaitCoroutine(float waitTime, UsuallyPointState state)
        {
            coroutine = StartCoroutine(WaitCoroutine(waitTime, state));
        }

        private IEnumerator WaitCoroutine(float waitTime, UsuallyPointState state)
        {
            yield return new WaitForSeconds(waitTime);
            state.EndWait();
        }
        
        private void StopCoroutines()
        {
            if (coroutine != null)
            {
                StopCoroutine(coroutine);
                coroutine = null;
            }
        }
        
        private void ClonePreviousState()
        {
            if (CurrentState != null)
            {
                var clonedState = CurrentState.Clone();
                if (clonedState != null)
                {
                    Context.PreviousState = clonedState;
                    Context.PreviousDestination = Agent?.destination;
                }
            }
        }
        
        public void InstantiateObject(GameObject prefab, Vector3 position)
        {
            Instantiate(prefab, position, Quaternion.identity);
        }

        public void InstantiateUi(GameObject prefab, Transform parent)
        {
            Instantiate(prefab, parent);
        }
    }
}