using UnityEngine;

public class EquippableItem : MonoBehaviour
{
    [SerializeField] private WeaponConfig config;
    public WeaponConfig Config => config;

    [Header("--- 데미지 밸런스 ---")]
    [SerializeField] private float lv1Mult = 1.0f;
    [SerializeField] private float lv2Mult = 1.5f;
    [SerializeField] private float lv3Mult = 2.5f;
    [SerializeField] private float strengthBonusFactor = 0.02f;

    private Rigidbody _rb;
    private Collider _col;
    private bool _isThrown;
    private int _chargeLevel;
    private Stats _thrower; // 던진 사람의 정보
    private Vector3 _originalWorldScale;

    private void Awake()
    {
        _rb = GetComponent<Rigidbody>();
        _col = GetComponent<Collider>();
        _originalWorldScale = transform.lossyScale;
    }

    public void OnPickedUp(Transform hand)
    {
        _isThrown = false;
        transform.SetParent(hand);

        transform.localScale = new Vector3(
            _originalWorldScale.x / hand.lossyScale.x,
            _originalWorldScale.y / hand.lossyScale.y,
            _originalWorldScale.z / hand.lossyScale.z
        );

        transform.localPosition = Vector3.zero;
        transform.localRotation = Quaternion.identity;

        if (_rb) _rb.isKinematic = true;
        if (_col) _col.enabled = false;
    }

    public void OnDropped(Vector3 throwDir)
    {
        _isThrown = false;
        transform.SetParent(null);
        transform.localScale = _originalWorldScale;

        if (_rb)
        {
            _rb.isKinematic = false;
            Vector3 force = (throwDir + Vector3.up * 0.5f).normalized * 5f;
            _rb.AddForce(force, ForceMode.Impulse);
            _rb.AddTorque(Random.insideUnitSphere * 3f, ForceMode.Impulse);
        }
        if (_col) _col.enabled = true;
    }

    public void OnThrown(Vector3 dir, float force, int lv, Stats s)
    {
        _isThrown = true;
        _chargeLevel = lv;
        _thrower = s; // 던진 사람(플레이어)을 기억합니다.

        transform.SetParent(null);
        transform.localScale = _originalWorldScale;

        if (_rb)
        {
            _rb.isKinematic = false;
            _rb.AddForce(dir * force, ForceMode.Impulse);
            _rb.AddTorque(transform.right * 10f, ForceMode.Impulse);
        }
        if (_col) _col.enabled = true;
    }

    private void OnCollisionEnter(Collision collision)
    {
        if (!_isThrown) return;

        // ⭐ [자폭 방지 핵심 로직] 
        // 부딪힌 대상이 나를 던진 사람(Stats를 가진 오브젝트)이라면 데미지를 주지 않고 무시합니다.
        if (_thrower != null && collision.gameObject == _thrower.gameObject)
        {
            return;
        }

        if (collision.gameObject.TryGetComponent<IDamageable>(out var target))
        {
            float mult = _chargeLevel == 3 ? lv3Mult : (_chargeLevel == 2 ? lv2Mult : lv1Mult);
            float strengthBonus = 1f + (_thrower.Strength * strengthBonusFactor);
            float finalDamage = (_thrower.BaseAttackDamage + (config.BaseDamage * strengthBonus)) * mult;

            target.TakeDamage(finalDamage);
            Debug.Log($"<color=orange>[투척 적중]</color> {collision.gameObject.name}에게 {finalDamage:F1} 데미지!");

            // ⭐ 적에게 맞은 경우 공격 판정을 즉시 종료 (관통을 원하면 이 줄을 지우세요)
            _isThrown = false;
        }

        // 벽이나 바닥에 부딪힌 경우에도 공격 판정 종료
        if (collision.gameObject.layer != LayerMask.NameToLayer("Player"))
        {
            _isThrown = false;
        }
    }
}