study/first_study/Assets/Scripts/EnemySc/Mob.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEditor.U2D.Animation;
using UnityEngine;
using UnityEngine.PlayerLoop;

using Random = UnityEngine.Random;

public class Mob : MonoBehaviour
{
    //[SerializeField] private MobBase mobBase;

    Rigidbody2D rbody;
    Animator anim;
    SpriteRenderer spriteRenderer;
    List<GameObject> myList;
    //[SerializeField] private PlayerController playerController;

    public int nextMove;
    //public float axisH = 0.0f;
    bool isDead = false;
    bool isHit = false;

    [Header("Temp Stats")]
    public float maxHp = 100f;
    public float currentHp;
    public float moveSpeed = 1f;

    [Header("Item Drop")]
    [SerializeField] private GameObject dropItemPrefab; // 드랍할 아이템 프리팹 (에디터에서 할당)
    [SerializeField][Range(0, 100)] private float dropChance = 50f; // 드랍 확률 (0~100%)

    void Start()
    {
        rbody = GetComponent<Rigidbody2D>();
        anim = GetComponent<Animator>();
        spriteRenderer = GetComponent<SpriteRenderer>();
        //playerController = GetComponent<PlayerController>();

        currentHp = maxHp; // 체력 초기화

        Invoke("Think",1);
    }

    void Update()
    {
        /*axisH = rbody.linearVelocity.x;

        float direction = axisH > 0 ? 1 : -1;
        transform.localScale = new Vector2(direction, 1);*/

        if (isDead) return;

        // 방향 전환
        if (nextMove != 0)
        {
            transform.localScale = new Vector2(nextMove > 0 ? 1 : -1, 1);
        }
    }

    void FixedUpdate()
    {
        if (isDead || isHit) return;

        rbody.linearVelocity = new Vector2(nextMove * moveSpeed, rbody.linearVelocity.y);

        Vector2 frontVec = new Vector2(rbody.position.x + 0.2f*nextMove, rbody.position.y);
        Debug.DrawRay(frontVec, Vector3.down, Color.green);
        RaycastHit2D rayHit = Physics2D.Raycast(frontVec, Vector3.down, 1, LayerMask.GetMask("Ground"));

        if (rayHit.collider == null)
        {
            nextMove *= -1;

            CancelInvoke("Think");

            Invoke("Think", 5);
        }
    }

    void Think()
    {
        if (isDead || isHit) return;

        Debug.Log("생각!");
        nextMove = Random.Range(-1, 2);

        float nextThinkTime = Random.Range(2f, 5f);

        anim.SetInteger("WalkSpeed", nextMove);
        Invoke("Think", nextThinkTime);
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("Player"))
        {
            PlayerController player = other.GetComponentInParent<PlayerController>();

            if (player != null)
            {
                player.TakeDamage(1, transform.position);
            }
        }
    }

    public void TakeDamage(float damageAmount, float stunTime, Vector2 attackerPos)  //데미지 크기, 타입, 공격 위치
    {
        if (isDead) return;

        currentHp -= damageAmount;
        Debug.Log($"몬스터 피격! 남은 체력: {currentHp}");

        if (currentHp <= 0)
        {
            Die();
            return;
        }

        StartCoroutine(KnockBack(attackerPos));
    }
    IEnumerator KnockBack(Vector2 attackerPos)
    {
        isHit = true;
        anim.SetTrigger("Hit"); // 피격 애니메이션 (있다면)

        // 넉백 방향 계산 (몬스터 - 공격자 = 밀려날 방향)
        Vector2 knockbackDir = (transform.position - (Vector3)attackerPos).normalized;

        // 넉백 힘 적용
        rbody.linearVelocity = Vector2.zero; // 기존 속도 초기화
        rbody.AddForce(knockbackDir * 1.5f + Vector2.up * 0.5f, ForceMode2D.Impulse); // 뒤로 살짝 뜨면서 밀림

        // 피격 효과
        if (spriteRenderer != null) spriteRenderer.color = Color.red;

        yield return new WaitForSeconds(0.5f); // 0.5초 경직

        if (spriteRenderer != null) spriteRenderer.color = Color.white;
        isHit = false;
        
        Think();
    }

    void Die()
    {
        isDead = true;
        anim.SetTrigger("Die");
        rbody.linearVelocity = Vector2.zero;
        GetComponent<Collider2D>().enabled = false; // 시체에 또 안 맞게

        Invoke("DropItem", 2);
        //DropItem();
        Destroy(gameObject, 2f); // 2초 뒤 삭제
    }

    void DropItem()
    {
        // 프리팹이 없으면 실행 안 함
        if (dropItemPrefab == null) return;

        // 0 ~ 100 사이의 난수 생성
        float randomValue = Random.Range(0f, 100f);

        // 확률 당첨 시
        if (randomValue <= dropChance)
        {
            Debug.Log("아이템 드랍 성공!");
            // 몬스터 위치에 아이템 생성 (Quaternion.identity는 회전 없음)
            Instantiate(dropItemPrefab, transform.position, Quaternion.identity);
        }
    }
}