using UnityEngine;

/// <summary>
/// 바닥에 떨어진 화살 아이템 (아이템 전용 — 발사체 기능 제거됨)
/// 습득 시 PlayerAttack에 파티클 프리팹 + 속성 정보를 전달합니다.
/// </summary>
public class ArrowPickup : MonoBehaviour
{
    [Header("--- 화살 아이템 정보 ---")]
    [SerializeField] private string arrowName = "기본 화살";
    [SerializeField] private ArrowElementType elementType = ArrowElementType.None;

    [Header("--- 스탯 ---")]
    [SerializeField] private float baseDamage = 15f;
    [SerializeField] private float elementDamage = 5f;
    [SerializeField] private float elementDuration = 3f;

    [Header("--- 발사체 파티클 ---")]
    [Tooltip("이 화살이 장착될 때 발사할 파티클 프리팹")]
    [SerializeField] private GameObject projectilePrefab;

    [Header("--- 비주얼 (필드 아이템) ---")]
    [SerializeField] private GameObject visualModel;

    [Header("--- UI 표시 ---")]
    [SerializeField] private GameObject pickupUI;
    [SerializeField] private float uiDisplayRange = 3f;

    [Header("--- Collider 설정 (자동 탐지) ---")]
    [Tooltip("아이템 습득용 Sphere Collider (Trigger)")]
    [SerializeField] private Collider pickupCollider;
    [Tooltip("바닥 충돌용 Box Collider (물리)")]
    [SerializeField] private Collider physicsCollider;

    private Transform playerTransform;
    private Rigidbody rb;

    /// <summary>
    /// [NEW] ArrowData 구조체로 정보 패키징
    /// </summary>
    public ArrowData GetArrowData()
    {
        return new ArrowData
        {
            arrowName = this.arrowName,
            elementType = this.elementType,
            baseDamage = this.baseDamage,
            elementDamage = this.elementDamage,
            elementDuration = this.elementDuration,
            projectilePrefab = this.projectilePrefab
        };
    }

    private void Awake()
    {
        rb = GetComponent<Rigidbody>();

        if (pickupCollider == null || physicsCollider == null)
        {
            AutoDetectColliders();
        }
    }

    /// <summary>
    /// Collider 자동 탐지 (기존 로직 유지)
    /// </summary>
    private void AutoDetectColliders()
    {
        Collider[] allColliders = GetComponents<Collider>();

        foreach (Collider col in allColliders)
        {
            if (col is SphereCollider && pickupCollider == null)
            {
                pickupCollider = col;
                Debug.Log($"습득용 Collider: {col.GetType().Name}");
            }
            else if (col is BoxCollider && physicsCollider == null)
            {
                physicsCollider = col;
                Debug.Log($"물리용 Collider: {col.GetType().Name}");
            }
        }
    }

    private void Start()
    {
        SetupAsItem();
    }

    /// <summary>
    /// 아이템 모드 설정 (기존 로직 유지 + 단순화)
    /// </summary>
    private void SetupAsItem()
    {
        GameObject player = GameObject.FindGameObjectWithTag("Player");
        if (player != null)
        {
            playerTransform = player.transform;
        }

        if (pickupUI != null) pickupUI.SetActive(false);

        // Collider 설정
        if (pickupCollider != null)
        {
            pickupCollider.enabled = true;
            pickupCollider.isTrigger = true;
        }

        if (physicsCollider != null)
        {
            physicsCollider.enabled = true;
            physicsCollider.isTrigger = false;
        }

        // 물리 설정
        if (rb != null)
        {
            rb.useGravity = true;
            rb.isKinematic = false;
            rb.collisionDetectionMode = CollisionDetectionMode.ContinuousDynamic;
        }
    }

    private void Update()
    {
        if (playerTransform == null || pickupUI == null) return;

        float distance = Vector3.Distance(transform.position, playerTransform.position);
        pickupUI.SetActive(distance <= uiDisplayRange);
    }

    /// <summary>
    /// [MODIFIED] PlayerInteraction에서 'E' 키를 눌렀을 때 호출
    /// 기존: SwapArrow(gameObject) → 변경: SetCurrentArrow(ArrowData)
    /// </summary>
    public void Pickup(PlayerAttack playerAttack)
    {
        if (playerAttack == null) return;

        // ArrowData를 패키징하여 PlayerAttack에 전달
        ArrowData data = GetArrowData();
        playerAttack.SetCurrentArrow(data);

        Debug.Log($"[{arrowName}] 화살 습득! 속성: {elementType}");

        // 아이템 제거
        Destroy(gameObject);
    }

    /// <summary>
    /// 몬스터 드롭 시 화살 정보 설정 (기존 함수 유지)
    /// </summary>
    public void SetArrowData(string name, float dmg, float spd, float rng)
    {
        arrowName = name;
        baseDamage = dmg;
    }

    /// <summary>
    /// [NEW] 속성 정보까지 포함한 전체 세팅 함수
    /// </summary>
    public void SetArrowDataFull(
        string name,
        ArrowElementType element,
        float baseDmg,
        float elemDmg,
        float elemDur,
        GameObject particlePrefab)
    {
        arrowName = name;
        elementType = element;
        baseDamage = baseDmg;
        elementDamage = elemDmg;
        elementDuration = elemDur;
        projectilePrefab = particlePrefab;
    }

    /// <summary>
    /// 바닥 충돌 시 속도 감쇠 (기존 로직 유지)
    /// </summary>
    private void OnCollisionEnter(Collision collision)
    {
        if (rb != null && collision.gameObject.CompareTag("Ground"))
        {
            rb.velocity *= 0.5f;
            rb.angularVelocity *= 0.5f;
        }
    }

    #region 디버그 시각화

    private void OnDrawGizmosSelected()
    {
        if (pickupCollider != null && pickupCollider.enabled)
        {
            Gizmos.color = Color.green;
            if (pickupCollider is SphereCollider sphere)
            {
                Gizmos.DrawWireSphere(transform.position + sphere.center, sphere.radius);
            }
        }

        if (physicsCollider != null && physicsCollider.enabled)
        {
            Gizmos.color = Color.blue;
            if (physicsCollider is BoxCollider box)
            {
                Gizmos.matrix = transform.localToWorldMatrix;
                Gizmos.DrawWireCube(box.center, box.size);
            }
        }

        // [NEW] 속성 색상 표시
        switch (elementType)
        {
            case ArrowElementType.Fire: Gizmos.color = Color.red; break;
            case ArrowElementType.Ice: Gizmos.color = Color.cyan; break;
            case ArrowElementType.Poison: Gizmos.color = new Color(0.5f, 1f, 0f); break;
            case ArrowElementType.Lightning: Gizmos.color = Color.yellow; break;
            default: Gizmos.color = Color.white; break;
        }
        Gizmos.DrawWireSphere(transform.position, 0.3f);
    }

    #endregion
}