using UnityEngine;
using UnityEngine.AI;
using System;

public class MonsterClass : MonoBehaviour, IDamageable
{
    [Header("스탯")]
    [SerializeField] protected float maxHP = 100f;
    protected float currentHP;
    public event Action<float, float> OnHealthChanged;

    [Header("피격 / 사망 애니메이션")]
    [SerializeField] protected string Monster_GetDamage = "Monster_GetDamage";
    [SerializeField] protected string Monster_Die = "Monster_Die";

    protected Animator animator;
    protected NavMeshAgent agent;
    protected AudioSource audioSource;
    protected bool isHit;
    protected bool isDead;

    [Header("경험치")]
    [SerializeField] protected int expReward = 10;
    public static System.Action<int> OnMonsterKilled;

    [Header("공통 사운드/이펙트")]
    [SerializeField] protected AudioClip hitSound;
    [SerializeField] protected AudioClip deathSound;
    [SerializeField] protected GameObject deathEffectPrefab;
    [SerializeField] protected ParticleSystem hitEffect;
    [SerializeField] protected Transform impactSpawnPoint;

    protected virtual void Start()
    {
        currentHP = maxHP;
        animator = GetComponent<Animator>();
        agent = GetComponent<NavMeshAgent>();
        audioSource = GetComponent<AudioSource>();
        OnHealthChanged?.Invoke(currentHP, maxHP);
    }

    // ⭐ 핵심: 부모에서 virtual을 붙여야 NormalMonster에서 에러가 안 납니다.
    public virtual void TakeDamage(float amount) { OnDamaged(amount); }

    public virtual void OnDamaged(float damage)
    {
        if (isDead) return;
        currentHP -= damage;
        Debug.Log($"{gameObject.name} 피격! 체력: {{{currentHP}/{maxHP}}}");
        OnHealthChanged?.Invoke(currentHP, maxHP);

        if (currentHP <= 0) { Die(); return; }
        if (!isHit) StartHit();
    }

    protected virtual void StartHit()
    {
        isHit = true;
        if (agent && agent.isOnNavMesh) { agent.isStopped = true; agent.velocity = Vector3.zero; }
        animator.Play(Monster_GetDamage, 0, 0f);
        if (hitEffect) hitEffect.Play();
        if (hitSound) audioSource.PlayOneShot(hitSound);
    }

    public virtual void OnHitEnd() { isHit = false; if (agent && agent.isOnNavMesh) agent.isStopped = false; }

    protected virtual void Die()
    {
        if (isDead) return;
        isDead = true;

        // ⭐ 핵심 수정: 애니메이션 신호 기다리지 말고 즉시 처리
        Debug.Log($"{gameObject.name} 사망! 경험치 {expReward} 지급 및 1.5초 후 파괴.");
        OnMonsterKilled?.Invoke(expReward);

        if (agent && agent.isOnNavMesh) { agent.isStopped = true; agent.velocity = Vector3.zero; }
        animator.Play(Monster_Die, 0, 0f);
        if (deathSound) audioSource.PlayOneShot(deathSound);

        // 1.5초 뒤 자동 삭제 (이벤트 씹힘 방지)
        Destroy(gameObject, 1.5f);
    }

    // 에러 방지용으로 남겨만 둠
    public void OnDeathAnimEnd() { }
}