using UnityEngine;
using UnityEngine.AI;
using System.Collections;
using System;

public abstract class MonsterClass : MonoBehaviour, IDamageable
{
    [Header("--- 최적화 설정 ---")]
    protected Renderer mobRenderer;
    protected Transform playerTransform;
    [SerializeField] protected float optimizationDistance = 40f;

    [Header("몬스터 기본 스탯")] // ⭐ 종류별로 다르게 설정할 핵심 수치들
    [SerializeField] protected float maxHP = 100f;
    [SerializeField] protected float attackDamage = 10f; // ⭐ [추가] 몬스터 공격력
    [SerializeField] protected int expReward = 10;      // ⭐ 경험치 수치
    [SerializeField] protected float moveSpeed = 3.5f;  // ⭐ 이동 속도 추가 가능

    protected float currentHP;
    public event Action<float, float> OnHealthChanged;

    [Header("피격 / 사망 / 대기 애니메이션")]
    [SerializeField] protected string Monster_Idle = "Monster_Idle";
    [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, isDead, isAttacking;

    [Header("AI 설정 (공격 후 휴식)")]
    [SerializeField] protected float attackRestDuration = 1.5f;
    protected bool isResting;

    public static System.Action<int> OnMonsterKilled;

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

    protected virtual void Awake()
    {
        mobRenderer = GetComponentInChildren<Renderer>();
        animator = GetComponent<Animator>();
        agent = GetComponent<NavMeshAgent>();
        audioSource = GetComponent<AudioSource>();

        // ⭐ 시작할 때 에이전트 속도를 스탯에 맞게 설정
        if (agent != null) agent.speed = moveSpeed;
    }

    protected virtual void OnEnable()
    {
        playerTransform = GameObject.FindGameObjectWithTag("Player")?.transform;
        if (mobRenderer != null) mobRenderer.enabled = true;
        Init();
        if (MobUpdateManager.Instance != null) MobUpdateManager.Instance.RegisterMob(this);
    }

    public void ResetStats()
    {
        isDead = false;
        currentHP = maxHP;
        OnHealthChanged?.Invoke(currentHP, maxHP);
        Collider col = GetComponent<Collider>();
        if (col != null) col.enabled = true;
    }

    protected virtual void OnDisable()
    {
        if (MobUpdateManager.Instance != null) MobUpdateManager.Instance.UnregisterMob(this);
    }

    protected virtual void Init() { }
    protected abstract void ExecuteAILogic();

    public void OnManagedUpdate()
    {
        if (isDead || playerTransform == null || !gameObject.activeInHierarchy) return;
        float distance = Vector3.Distance(transform.position, playerTransform.position);
        if (distance > optimizationDistance)
        {
            StopMovement();
            if (mobRenderer != null && mobRenderer.enabled) mobRenderer.enabled = false;
            return;
        }
        if (mobRenderer != null && !mobRenderer.enabled) mobRenderer.enabled = true;
        if (mobRenderer != null && !mobRenderer.isVisible) { StopMovement(); return; }
        if (agent != null && agent.isOnNavMesh && agent.isStopped) agent.isStopped = false;

        ExecuteAILogic();
    }

    protected void StopMovement()
    {
        if (agent != null && agent.isOnNavMesh) { agent.isStopped = true; agent.velocity = Vector3.zero; }
        if (animator != null) { animator.SetFloat("Speed", 0f); animator.Play(Monster_Idle); }
    }

    public virtual void TakeDamage(float amount) { OnDamaged(amount); }
    public virtual void OnDamaged(float damage)
    {
        if (isDead) return;
        currentHP -= damage;
        OnHealthChanged?.Invoke(currentHP, maxHP);
        if (currentHP <= 0) { Die(); return; }
        if (!isHit) StartHit();
    }

    protected virtual void StartHit()
    {
        isHit = true; isAttacking = false; isResting = false;
        StopAllCoroutines();
        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 OnAttackStart() { isAttacking = true; isResting = false; }
    public virtual void OnAttackEnd() { isAttacking = false; if (!isDead && !isHit) StartCoroutine(RestAfterAttack()); }
    protected IEnumerator RestAfterAttack() { isResting = true; yield return new WaitForSeconds(attackRestDuration); isResting = false; }
    public virtual void OnHitEnd() { isHit = false; if (agent && agent.isOnNavMesh) agent.isStopped = false; }

    protected virtual void Die()
    {
        if (isDead) return;
        isDead = true;
        OnMonsterKilled?.Invoke(expReward); // ⭐ 설정된 경험치 수치 전달
        Collider col = GetComponent<Collider>();
        if (col != null) col.enabled = false;
        if (agent && agent.isOnNavMesh) { agent.isStopped = true; agent.velocity = Vector3.zero; }
        animator.Play(Monster_Die, 0, 0f);
        if (deathSound) audioSource.PlayOneShot(deathSound);
        Invoke("ReturnToPool", 1.5f);
    }
    public bool IsDead => isDead;
    protected void ReturnToPool() => gameObject.SetActive(false);
}