using UnityEngine;
using UnityEngine.AI;
using System.Collections; // IEnumerator 사용을 위해 추가

/// <summary>
/// 근접 공격 몬스터 (칼, 도끼 등)
/// </summary>
public class MeleeMonster : MonsterClass
{
    [Header("=== 근접 공격 설정 ===")]
    // [SerializeField] private MonsterWeapon myWeapon;
    [SerializeField] private float attackRange = 2f;
    [SerializeField] private float attackDelay = 1.5f;

    private float lastAttackTime;

    [Header("공격 / 이동 애니메이션")]
    [SerializeField] private string[] attackAnimations = { "Monster_Attack_1" };
    [SerializeField] private string Monster_Walk = "Monster_Walk";

    [Header("AI 상세 설정")]
    [SerializeField] private float stopBuffer = 0.3f;
    [SerializeField] private float patrolRadius = 5f;
    [SerializeField] private float patrolInterval = 2f;

    private float nextPatrolTime;
    private float repathInterval = 0.3f;
    private float nextRepathTime;
    private int attackIndex;
    private bool isPlayerInZone;

    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
    // 초기화
    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

    protected override void Init()
    {
        if (agent != null) agent.stoppingDistance = attackRange - 0.4f;
        if (animator != null) animator.applyRootMotion = false;
    }

    protected override void OnResetStats()
    {
        // 무기에 데미지 설정
        if (myWeapon != null)
        {
            myWeapon.SetDamage(attackDamage);
        }
    }

    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
    // AI 로직
    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

    protected override void ExecuteAILogic()
    {
        if (isHit || isAttacking || isResting) return;

        float distance = Vector3.Distance(transform.position, playerTransform.position);

        if (isPlayerInZone || distance <= attackRange * 2f)
            HandlePlayerTarget();
        else
            Patrol();

        UpdateMovementAnimation();
    }

    void HandlePlayerTarget()
    {
        float distance = Vector3.Distance(transform.position, playerTransform.position);

        if (distance <= attackRange - stopBuffer)
            TryAttack();
        else if (Time.time >= nextRepathTime)
        {
            if (agent.isOnNavMesh) agent.SetDestination(playerTransform.position);
            nextRepathTime = Time.time + repathInterval;
        }
    }

    void TryAttack()
    {
        if (Time.time < lastAttackTime + attackDelay) return;
        lastAttackTime = Time.time;

        string attackName = attackAnimations[attackIndex];
        attackIndex = (attackIndex + 1) % attackAnimations.Length;

        isAttacking = true;

        if (agent.isOnNavMesh)
        {
            agent.isStopped = true;
            agent.velocity = Vector3.zero;
        }

        animator.Play(attackName, 0, 0f);
    }

    void UpdateMovementAnimation()
    {
        if (isAttacking || isHit || isResting) return;

        if (agent.velocity.magnitude < 0.1f)
            animator.Play(Monster_Idle);
        else
            animator.Play(Monster_Walk);
    }

    void Patrol()
    {
        if (Time.time < nextPatrolTime) return;

        Vector3 randomPoint = transform.position + new Vector3(
            Random.Range(-patrolRadius, patrolRadius),
            0,
            Random.Range(-patrolRadius, patrolRadius)
        );

        if (NavMesh.SamplePosition(randomPoint, out NavMeshHit hit, 3f, NavMesh.AllAreas))
            if (agent.isOnNavMesh) agent.SetDestination(hit.position);

        nextPatrolTime = Time.time + patrolInterval;
    }

    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
    // 공격 이벤트 (애니메이션에서 호출)
    // ⭐ [핵심 수정] override 추가!
    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

    public override void OnAttackStart()
    {
        // base.OnAttackStart(); // 부모 기능도 쓰고 싶으면 주석 해제
        isAttacking = true;
        isResting = false;
        if (myWeapon != null) myWeapon.EnableHitBox();
    }

    public override void OnAttackEnd()
    {
        if (myWeapon != null) myWeapon.DisableHitBox();
        isAttacking = false;
        if (!isDead && !isHit) StartCoroutine(RestAfterAttack());
    }

    // ⭐ [핵심 수정] override 및 protected 추가!
    protected override IEnumerator RestAfterAttack()
    {
        isResting = true;
        yield return new WaitForSeconds(attackRestDuration);
        isResting = false;
    }

    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
    // 피격 / 사망 시 무기 끄기
    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

    protected override void OnStartHit()
    {
        if (myWeapon != null) myWeapon.DisableHitBox();
    }

    protected override void OnDie()
    {
        if (myWeapon != null) myWeapon.DisableHitBox();
    }

    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
    // Trigger 감지 (플레이어 인식 영역)
    // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("Player")) isPlayerInZone = true;
    }

    private void OnTriggerExit(Collider other)
    {
        if (other.CompareTag("Player")) isPlayerInZone = false;
    }
}