using System.Collections.Generic;
using UnityEngine;
using Colosseum.Abnormalities;

namespace Colosseum.UI
{
    /// <summary>
    /// 이상 상태 목록 UI 관리자
    /// 버프/디버프 목록을 표시하고 관리합니다.
    /// </summary>
    public class AbnormalityListUI : MonoBehaviour
    {
        [Header("Containers")]
        [Tooltip("버프 컨테이너")]
        [SerializeField] private Transform buffContainer;

        [Tooltip("디버프 컨테이너")]
        [SerializeField] private Transform debuffContainer;

        [Header("Prefab")]
        [Tooltip("이상 상태 슬롯 프리팹")]
        [SerializeField] private AbnormalitySlotUI slotPrefab;

        [Header("Settings")]
        [Tooltip("최대 표시 개수")]
        [SerializeField] private int maxSlots = 10;

        [Tooltip("자동으로 플레이어 추적")]
        [SerializeField] private bool autoFindPlayer = true;

        // 추적 중인 AbnormalityManager
        private AbnormalityManager targetManager;

        // 생성된 슬롯 풀
        private readonly List<AbnormalitySlotUI> slotPool = new List<AbnormalitySlotUI>();

        // 현재 활성화된 슬롯 목록
        private readonly List<AbnormalitySlotUI> activeSlots = new List<AbnormalitySlotUI>();

        // 이전 프레임의 효과 수 (변경 감지용)
        private int lastAbnormalityCount = -1;

        private void Start()
        {
            Debug.Log("[AbnormalityListUI] Start() called");

            if (autoFindPlayer)
            {
                // 로컬 플레이어 찾기
                FindLocalPlayer();
            }

            // 슬롯 풀 초기화
            InitializeSlotPool();

            Debug.Log($"[AbnormalityListUI] slotPrefab: {(slotPrefab != null ? slotPrefab.name : "NULL")}");
            Debug.Log($"[AbnormalityListUI] buffContainer: {(buffContainer != null ? buffContainer.name : "NULL")}");
            Debug.Log($"[AbnormalityListUI] debuffContainer: {(debuffContainer != null ? debuffContainer.name : "NULL")}");
        }

        private void OnDestroy()
        {
            // 이벤트 구독 해제
            if (targetManager != null)
            {
                targetManager.OnAbnormalityAdded -= OnAbnormalityAdded;
                targetManager.OnAbnormalityRemoved -= OnAbnormalityRemoved;
                targetManager.OnAbnormalitiesChanged -= OnAbnormalitiesChanged;
            }
        }

        private void Update()
        {
            // 타겟이 없으면 주기적으로 플레이어 찾기
            if (targetManager == null && autoFindPlayer && Time.frameCount % 30 == 0)
            {
                FindLocalPlayer();
            }

            // 주기적으로 UI 갱신 (성능 최적화를 위해 매 프레임이 아닌 일정 간격으로)
            if (Time.frameCount % 10 == 0) // 10프레임마다 한 번
            {
                RefreshUI();
            }
        }

        /// <summary>
        /// 로컬 플레이어 찾기
        /// </summary>
        private void FindLocalPlayer()
        {
            var playerObjects = FindObjectsByType<AbnormalityManager>(FindObjectsSortMode.None);
            Debug.Log($"[AbnormalityListUI] Found {playerObjects.Length} AbnormalityManager(s)");

            foreach (var manager in playerObjects)
            {
                // 네트워크 오브젝트인 경우 로컬 플레이어 확인
                if (manager.TryGetComponent<Unity.Netcode.NetworkObject>(out var netObj))
                {
                    Debug.Log($"[AbnormalityListUI] Checking {manager.gameObject.name}, IsOwner: {netObj.IsOwner}");
                    if (netObj.IsOwner)
                    {
                        Debug.Log($"[AbnormalityListUI] Setting target to local player: {manager.gameObject.name}");
                        SetTarget(manager);
                        return;
                    }
                }
            }

            // 네트워크 오브젝트가 없거나 로컬 플레이어를 찾지 못한 경우
            // 첫 번째 플레이어 사용 (싱글플레이어용)
            if (playerObjects.Length > 0)
            {
                Debug.Log($"[AbnormalityListUI] No local player found, using first manager: {playerObjects[0].gameObject.name}");
                SetTarget(playerObjects[0]);
            }
            else
            {
                Debug.LogWarning("[AbnormalityListUI] No AbnormalityManager found!");
            }
        }

        /// <summary>
        /// 추적 대상 설정
        /// </summary>
        /// <param name="manager">추적할 AbnormalityManager</param>
        public void SetTarget(AbnormalityManager manager)
        {
            Debug.Log($"[AbnormalityListUI] SetTarget called with: {(manager != null ? manager.gameObject.name : "null")}");

            // 기존 구독 해제
            if (targetManager != null)
            {
                targetManager.OnAbnormalityAdded -= OnAbnormalityAdded;
                targetManager.OnAbnormalityRemoved -= OnAbnormalityRemoved;
                targetManager.OnAbnormalitiesChanged -= OnAbnormalitiesChanged;
            }

            targetManager = manager;

            // 새로운 대상 구독
            if (targetManager != null)
            {
                targetManager.OnAbnormalityAdded += OnAbnormalityAdded;
                targetManager.OnAbnormalityRemoved += OnAbnormalityRemoved;
                targetManager.OnAbnormalitiesChanged += OnAbnormalitiesChanged;
                Debug.Log("[AbnormalityListUI] Events subscribed successfully");
            }

            // 즉시 UI 갱신
            ForceRefreshUI();
        }

        /// <summary>
        /// 슬롯 풀 초기화
        /// </summary>
        private void InitializeSlotPool()
        {
            if (slotPrefab == null)
            {
                Debug.LogWarning("[AbnormalityListUI] Slot prefab is not assigned");
                return;
            }

            // 필요한 만큼 슬롯 미리 생성
            for (int i = 0; i < maxSlots; i++)
            {
                var slot = CreateSlot();
                slot.gameObject.SetActive(false);
                slotPool.Add(slot);
            }
        }

        /// <summary>
        /// 새 슬롯 생성
        /// </summary>
        private AbnormalitySlotUI CreateSlot()
        {
            var go = Instantiate(slotPrefab.gameObject, transform);
            return go.GetComponent<AbnormalitySlotUI>();
        }

        /// <summary>
        /// 슬롯 가져오기 (풀에서 또는 새로 생성)
        /// </summary>
        private AbnormalitySlotUI GetSlot()
        {
            // 풀에서 비활성화된 슬롯 찾기
            foreach (var slot in slotPool)
            {
                if (!slot.gameObject.activeSelf)
                {
                    return slot;
                }
            }

            // 풀에 없으면 새로 생성
            if (slotPool.Count < maxSlots)
            {
                var newSlot = CreateSlot();
                slotPool.Add(newSlot);
                return newSlot;
            }

            return null;
        }

        /// <summary>
        /// 슬롯 반환 (비활성화)
        /// </summary>
        private void ReturnSlot(AbnormalitySlotUI slot)
        {
            slot.gameObject.SetActive(false);
            activeSlots.Remove(slot);
        }

        /// <summary>
        /// 이상 상태 추가 시 호출
        /// </summary>
        private void OnAbnormalityAdded(ActiveAbnormality abnormality)
        {
            Debug.Log($"[AbnormalityListUI] OnAbnormalityAdded event received: {abnormality.Data.abnormalityName}");
            ForceRefreshUI();
        }

        /// <summary>
        /// 이상 상태 제거 시 호출
        /// </summary>
        private void OnAbnormalityRemoved(ActiveAbnormality abnormality)
        {
            Debug.Log($"[AbnormalityListUI] OnAbnormalityRemoved event received: {abnormality.Data.abnormalityName}");
            ForceRefreshUI();
        }

        /// <summary>
        /// 이상 상태 변경 시 호출
        /// </summary>
        private void OnAbnormalitiesChanged()
        {
            Debug.Log("[AbnormalityListUI] OnAbnormalitiesChanged event received");
            ForceRefreshUI();
        }

        /// <summary>
        /// UI 강제 갱신
        /// </summary>
        public void ForceRefreshUI()
        {
            if (targetManager == null)
            {
                Debug.LogWarning("[AbnormalityListUI] ForceRefreshUI called but targetManager is null");
                return;
            }

            // 모든 슬롯 반환
            foreach (var slot in activeSlots.ToArray())
            {
                ReturnSlot(slot);
            }

            activeSlots.Clear();

            // 활성화된 이상 상태 표시
            var abnormalities = targetManager.ActiveAbnormalities;
            Debug.Log($"[AbnormalityListUI] ForceRefreshUI: {abnormalities.Count} abnormalities found");

            foreach (var abnormality in abnormalities)
            {
                var slot = GetSlot();
                if (slot == null)
                {
                    Debug.LogWarning("[AbnormalityListUI] Could not get slot from pool");
                    continue;
                }

                // 버프/디버프에 따라 적절한 컨테이너에 배치
                Transform container = abnormality.Data.isDebuff ? debuffContainer : buffContainer;
                if (container == null) container = transform;

                Debug.Log($"[AbnormalityListUI] Adding slot for: {abnormality.Data.abnormalityName}, isDebuff: {abnormality.Data.isDebuff}, container: {container.name}");

                slot.transform.SetParent(container, false);
                slot.Initialize(abnormality);
                slot.gameObject.SetActive(true);
                activeSlots.Add(slot);
            }

            lastAbnormalityCount = abnormalities.Count;
        }

        /// <summary>
        /// UI 주기적 갱신 (변경 감지 시에만)
        /// </summary>
        private void RefreshUI()
        {
            if (targetManager == null) return;

            int currentCount = targetManager.ActiveAbnormalities.Count;

            // 이상 상태 수가 변경되었으면 갱신
            if (currentCount != lastAbnormalityCount)
            {
                ForceRefreshUI();
            }

            // 활성 슬롯들의 지속 시간 업데이트
            UpdateSlotDurations();
        }

        /// <summary>
        /// 모든 활성 슬롯의 지속 시간 업데이트
        /// </summary>
        private void UpdateSlotDurations()
        {
            foreach (var slot in activeSlots)
            {
                if (slot != null && slot.TrackedAbnormality != null)
                {
                    var abnormality = slot.TrackedAbnormality;
                    slot.UpdateDisplay(abnormality.RemainingDuration, abnormality.Data.duration);
                }
            }
        }

        /// <summary>
        /// 모든 슬롯 숨기기
        /// </summary>
        public void HideAll()
        {
            foreach (var slot in activeSlots.ToArray())
            {
                ReturnSlot(slot);
            }

            activeSlots.Clear();
        }
    }
}