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public enum EnemyState { Idle, Chase, Attack }
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public class Enemy : MonoBehaviour
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{
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    public EnemyState State
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    {
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        get{}
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        private set
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        {
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            if(State != value)
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            {
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                StateExit();
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                State = value;
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                StateEnter();
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            }
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        }
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    }
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    private void Start()
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    {
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        State = EnemyState.Idle;
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    }
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    public void SwitchState(EnemyState newState)
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    {
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        State = newState;
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    }
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    private void StateEnter()
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    {
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        switch(State)
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        {
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            case EnemyState.Idle:
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                break;
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            case EnemyState.Chase:
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                break;
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            case EnemyState.Attack:
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                break;
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        }
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    }
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    private void StateExit()
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    {
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        switch(State)
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        {
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            case EnemyState.Idle:
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                break;
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            case EnemyState.Chase:
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                break;
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            case EnemyState.Attack:
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                break;
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        }
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    }
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    private void Update()
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    {
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        switch(State)
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        {
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            case EnemyState.Idle:
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                break;
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            case EnemyState.Chase:
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                break;
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            case EnemyState.Attack:
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                break;
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        }
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    }
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    private void FixedUpdate()
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    {
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        switch(State)
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        {
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            case EnemyState.Idle:
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                break;
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            case EnemyState.Chase:
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                break;
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            case EnemyState.Attack:
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                break;
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        }
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    }
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}