Knight_Hollow/Assets/Scripts/Player/StateMachine.cs

using System.Collections.Generic;
using UnityEngine;

public enum State
{
    IDLE, MOVE, JUMP
}

public class StateMachine
{
    private IState _state;
    private State _currentState;
    
    //장점 : key 값을 바로 불러와서 value를 리턴할 수 있게 된다. (자료구조가 많은 데이터를 담았을 때 리턴하는 경우 속도의 효율)
    //단점 : 자료구조의 데이터가 적을 때, 100개 혹은 10 이하의 데이터에서 Dictionary를 사용할 경우 속도가 오히려 느릴 수 있다.
    private Dictionary<State, IState> _states = new Dictionary<State, IState>();
    
    public StateMachine(State state, PlayerMove player)
    {
        _states.Add(State.IDLE, new IdleState(player));
        _states.Add(State.MOVE, new MoveState(player));
        _states.Add(State.JUMP, new JumpState(player));

        _currentState = state;
        _state = _states[state];
        _state.Enter();
    }

    public void Update()
    {
        _state.Update();
        var newState = _state.CheckTransition();

        // 상태가 변경되었는지 확인 (참조가 다르면)
        if (_currentState != newState)
        {
            _state.Exit();
            SetTransition(newState);
        }
    }

    public void SetTransition(State state)
    {
        // 다음음 상태로 전환
        _currentState = state;
        _state = _states[state];
        _state.Enter();
    }
}

public interface IState
{
    void Enter();
        
    void Update();

    void Exit();
        
    // 트리거 조건일 경우 다음 상태로 전환
    State CheckTransition();
}

public class IdleState : IState
{
    private PlayerMove _player; // PlayerMove 객체에 대한 참조

    public IdleState(PlayerMove player)
    {
        _player = player;
    }

    public void Enter()
    {
        // _player.Animator.SetBool(PlayerMove.IsMoving, false);
    }

    public void Update()
    {
        // 상태별 로직은 여기서는 필요 없음
    }

    public void Exit()
    {
        // Idle 상태에서 벗어날 때의 로직
    }

    public State CheckTransition()
    {
        if (Input.GetButtonDown("Jump"))
        {
            return State.JUMP;
        }
        if (Mathf.Abs(Input.GetAxisRaw("Horizontal")) > 0)
        {
            return State.MOVE;
        }
        return State.IDLE;
    }
}

public class MoveState : IState
{
    private static int _isMoving = Animator.StringToHash("isMoving");
    
    private PlayerMove _player;

    public MoveState(PlayerMove player)
    {
        _player = player;
    }

    public void Enter()
    {
        _player.Animator.SetBool(_isMoving, true);
    }

    public void Update()
    {
        // 상태별 로직
        _player.SpriteRenderer.flipX = Input.GetAxisRaw("Horizontal") > 0;
    }
    
    public void Exit()
    {
        // 이동 상태에서 벗어날 때 필요한 로직
        _player.Animator.SetBool(_isMoving, false);
    }

    public State CheckTransition()
    {
        if (Input.GetButtonDown("Jump"))
        {
            return State.JUMP;
        }
        if (Mathf.Abs(Input.GetAxisRaw("Horizontal")) < 0.1f)
        {
            return State.IDLE; // Create new IdleState object
        }
        return State.MOVE;
    }
}

public class JumpState : IState
{
    private static int _isJumping = Animator.StringToHash("isJumping");

    private PlayerMove _player;
    
    public JumpState(PlayerMove player)
    {
        _player = player;
    }

    public void Enter()
    {
        _player.RigidBody.AddForce(Vector2.up * _player.jumpPower, ForceMode2D.Impulse);
        _player.Animator.SetBool(_isJumping, true);
    }

    public void Update()
    {
        // 점프 중 스프라이트 방향 변경
        if (Input.GetButton("Horizontal"))
        {
            _player.SpriteRenderer.flipX = Input.GetAxisRaw("Horizontal") > 0;
        }
    }

    public void Exit()
    {
        _player.Animator.SetBool(_isJumping, false);
    }

    public State CheckTransition()
    {
        if (_player.RigidBody.linearVelocity.y < 0)
        {
            RaycastHit2D rayHit = Physics2D.Raycast(_player.RigidBody.position, Vector3.down, 1, LayerMask.GetMask("Platform"));
            
            if (rayHit.collider != null && rayHit.distance < 0.7f)
            {
                return State.IDLE;
            }
        }
        return State.JUMP;
    }
}

public class AttackState : IState
{
    private PlayerMove _player;
    private IdleState _idleState;
    
    public AttackState(PlayerMove player)
    {
        _player = player;
    }

    public void Enter()
    {

    }

    public void Update()
    {

    }

    public void FixedUpdate()
    {

    }

    public void Exit()
    {
        // _player.Animator.SetBool(PlayerMove.IsAttacking, false);
    }

    public State CheckTransition()
    {
        // 공격이 종료됐을 때
        // idle
        return State.IDLE;
    }
}