using UnityEngine;
using Colosseum.Player;
using Colosseum.Skills;

namespace Colosseum.UI
{
    /// <summary>
    /// 스킬 퀵슬롯 UI 관리자.
    /// PlayerSkillInput과 연동하여 쿨타임, 마나 등을 표시합니다.
    /// </summary>
    public class SkillQuickSlotUI : MonoBehaviour
    {
        [Header("Skill Slots")]
        [Tooltip("표시 순서대로 배치된 스킬 슬롯 UI")]
        [SerializeField] private SkillSlotUI[] skillSlots = new SkillSlotUI[7];

        [Header("Debug")]
        [SerializeField] private bool debugMode = false;

        [Header("Display Order")]
        [Tooltip("UI 슬롯 순서가 참조할 실제 스킬 슬롯 인덱스")]
        [SerializeField] private int[] slotMappings = { 6, 0, 1, 2, 3, 4, 5 };

        [Header("Keybind Labels")]
        [Tooltip("키바인딩 표시 텍스트")]
        [SerializeField] private string[] keyLabels = { "Ctrl", "L", "R", "1", "2", "3", "4" };

        private PlayerSkillInput playerSkillInput;
        private PlayerNetworkController networkController;

        private void Awake()
        {
            AutoCollectSkillSlots();
        }

        private void OnValidate()
        {
            AutoCollectSkillSlots();
        }

        private void Start()
        {
            // 로컬 플레이어 찾기
            FindLocalPlayer();
        }

        private void OnDestroy()
        {
            if (playerSkillInput != null)
            {
                playerSkillInput.OnSkillSlotsChanged -= HandleSkillSlotsChanged;
            }
        }

        /// <summary>
        /// 자식 슬롯을 자동 수집해 프리팹 중첩 구조 변경에도 참조가 유지되도록 합니다.
        /// </summary>
        private void AutoCollectSkillSlots()
        {
            SkillSlotUI[] foundSlots = GetComponentsInChildren<SkillSlotUI>(true);
            if (foundSlots == null || foundSlots.Length == 0)
            {
                return;
            }

            if (skillSlots == null || skillSlots.Length != foundSlots.Length)
            {
                skillSlots = foundSlots;
                return;
            }

            for (int i = 0; i < foundSlots.Length; i++)
            {
                if (skillSlots[i] != foundSlots[i])
                {
                    skillSlots = foundSlots;
                    return;
                }
            }

            EnsureDisplayConfig();
        }

        /// <summary>
        /// 슬롯 수 변경이나 프리팹 구조 변경 시 기본 표시 구성을 복구합니다.
        /// </summary>
        private void EnsureDisplayConfig()
        {
            int slotCount = skillSlots != null ? skillSlots.Length : 0;
            if (slotCount <= 0)
            {
                return;
            }

            if (!IsValidSlotMappings(slotMappings, slotCount))
            {
                slotMappings = BuildDefaultSlotMappings(slotCount);
            }

            if (keyLabels == null || keyLabels.Length != slotCount)
            {
                keyLabels = BuildDefaultKeyLabels(slotCount);
            }
        }

        /// <summary>
        /// 7칸 액션바는 긴급회피를 맨 왼쪽에 두고, 나머지는 기본 스킬 순서를 유지합니다.
        /// </summary>
        private static int[] BuildDefaultSlotMappings(int slotCount)
        {
            int[] defaultMappings = new int[slotCount];

            if (slotCount == 7)
            {
                defaultMappings[0] = 6;
                for (int i = 1; i < slotCount; i++)
                {
                    defaultMappings[i] = i - 1;
                }

                return defaultMappings;
            }

            for (int i = 0; i < slotCount; i++)
            {
                defaultMappings[i] = i;
            }

            return defaultMappings;
        }

        /// <summary>
        /// 기본 키 라벨을 슬롯 수에 맞춰 생성합니다.
        /// </summary>
        private static string[] BuildDefaultKeyLabels(int slotCount)
        {
            if (slotCount == 7)
            {
                return new[] { "Ctrl", "L", "R", "1", "2", "3", "4" };
            }

            string[] defaultLabels = new string[slotCount];
            for (int i = 0; i < slotCount; i++)
            {
                defaultLabels[i] = (i + 1).ToString();
            }

            return defaultLabels;
        }

        /// <summary>
        /// 표시 매핑이 현재 슬롯 수에 대해 유효한지 검사합니다.
        /// </summary>
        private static bool IsValidSlotMappings(int[] mappings, int slotCount)
        {
            if (mappings == null || mappings.Length != slotCount)
            {
                return false;
            }

            bool[] usedIndices = new bool[slotCount];
            for (int i = 0; i < mappings.Length; i++)
            {
                int mappedIndex = mappings[i];
                if (mappedIndex < 0 || mappedIndex >= slotCount || usedIndices[mappedIndex])
                {
                    return false;
                }

                usedIndices[mappedIndex] = true;
            }

            return true;
        }

        /// <summary>
        /// UI 인덱스를 실제 플레이어 스킬 슬롯 인덱스로 변환합니다.
        /// </summary>
        private int GetMappedSlotIndex(int displayIndex)
        {
            EnsureDisplayConfig();

            if (displayIndex < 0 || displayIndex >= slotMappings.Length)
            {
                return displayIndex;
            }

            return slotMappings[displayIndex];
        }

        /// <summary>
        /// 실제 슬롯 인덱스를 표시 슬롯 인덱스로 역변환합니다.
        /// </summary>
        private int GetDisplayIndex(int slotIndex)
        {
            EnsureDisplayConfig();

            for (int i = 0; i < slotMappings.Length; i++)
            {
                if (slotMappings[i] == slotIndex)
                {
                    return i;
                }
            }

            return -1;
        }

        private void FindLocalPlayer()
        {
            var players = FindObjectsByType<PlayerSkillInput>(FindObjectsSortMode.None);

            if (players.Length == 0)
            {
                Debug.LogWarning("[SkillQuickSlotUI] No PlayerSkillInput found in scene");
                return;
            }

            foreach (var player in players)
            {
                if (player.IsOwner)
                {
                    SetPlayer(player);
                    networkController = player.GetComponent<PlayerNetworkController>();
                    Debug.Log($"[SkillQuickSlotUI] Found local player: {player.name}");
                    return;
                }
            }

            Debug.LogWarning("[SkillQuickSlotUI] No local player found (IsOwner = false)");
        }

        private void InitializeSlots()
        {
            AutoCollectSkillSlots();
            if (playerSkillInput == null) return;

            int initializedCount = 0;
            for (int i = 0; i < skillSlots.Length; i++)
            {
                int mappedSlotIndex = GetMappedSlotIndex(i);
                SkillData skill = playerSkillInput.GetSkill(mappedSlotIndex);
                string keyLabel = i < keyLabels.Length ? keyLabels[i] : (i + 1).ToString();

                if (skillSlots[i] != null)
                {
                    skillSlots[i].Initialize(mappedSlotIndex, skill, keyLabel);
                    if (skill != null) initializedCount++;
                }
                else
                {
                    Debug.LogWarning($"[SkillQuickSlotUI] Slot {i} is not assigned");
                }
            }

            Debug.Log($"[SkillQuickSlotUI] Initialized {initializedCount} skill slots");
        }

        private void Update()
        {
            if (playerSkillInput == null)
            {
                // 플레이어가 아직 없으면 다시 찾기 시도
                FindLocalPlayer();
                return;
            }

            UpdateSlotStates();
        }

        private float debugLogTimer = 0f;

        private void UpdateSlotStates()
        {
            bool shouldLog = debugMode && Time.time > debugLogTimer;
            if (shouldLog) debugLogTimer = Time.time + 1f;

            for (int i = 0; i < skillSlots.Length; i++)
            {
                if (skillSlots[i] == null) continue;

                int mappedSlotIndex = GetMappedSlotIndex(i);
                SkillData skill = playerSkillInput.GetSkill(mappedSlotIndex);
                if (skill == null) continue;

                float remainingCooldown = playerSkillInput.GetRemainingCooldown(mappedSlotIndex);
                float totalCooldown = skill.Cooldown;
                bool hasEnoughMana = networkController == null || networkController.Mana >= skill.ManaCost;

                if (shouldLog && remainingCooldown > 0f)
                {
                    Debug.Log($"[SkillQuickSlotUI] Slot {mappedSlotIndex}: {skill.SkillName}, CD: {remainingCooldown:F1}/{totalCooldown:F1}");
                }

                skillSlots[i].UpdateState(remainingCooldown, totalCooldown, hasEnoughMana);
            }
        }

        /// <summary>
        /// 플레이어 참조 수동 설정 (씬 전환 등에서 사용)
        /// </summary>
        public void SetPlayer(PlayerSkillInput player)
        {
            if (playerSkillInput != null)
            {
                playerSkillInput.OnSkillSlotsChanged -= HandleSkillSlotsChanged;
            }

            playerSkillInput = player;
            networkController = player?.GetComponent<PlayerNetworkController>();

            if (playerSkillInput != null)
            {
                playerSkillInput.OnSkillSlotsChanged += HandleSkillSlotsChanged;
            }

            InitializeSlots();
        }

        /// <summary>
        /// 특정 슬롯의 스킬 변경
        /// </summary>
        public void UpdateSkillSlot(int slotIndex, SkillData skill)
        {
            AutoCollectSkillSlots();

            int displayIndex = GetDisplayIndex(slotIndex);
            if (displayIndex < 0 || displayIndex >= skillSlots.Length) return;

            string keyLabel = displayIndex < keyLabels.Length ? keyLabels[displayIndex] : (displayIndex + 1).ToString();
            skillSlots[displayIndex].Initialize(slotIndex, skill, keyLabel);
        }

        private void HandleSkillSlotsChanged()
        {
            InitializeSlots();
        }
    }
}