using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using BaseGames.Core;
using BaseGames.Core.Events;
using BaseGames.Player;

namespace BaseGames.UI
{
    /// <summary>
    /// 能力解锁总览面板（数据驱动）。据 <see cref="AbilityMetaSO"/> 列出全部能力 + 已解锁/未解锁态。
    /// 在场景中找 <see cref="PlayerStats"/> 读 <see cref="PlayerStats.UnlockedAbilities"/>；
    /// 订阅 <see cref="AbilityTypeEventChannelSO"/>(EVT_AbilityUnlocked) 实时刷新解锁态。
    /// 策划改 UI_AbilityMeta 即增删/重排能力、改标签图标；美术改 UI_AbilityCell / 面板预制件改样式。
    /// </summary>
    public class DataDrivenAbilityPanel : MonoBehaviour
    {
        [Header("数据 / 单元格")]
        [SerializeField] private AbilityMetaSO   _meta;
        [Tooltip("能力格的父节点（通常挂 GridLayoutGroup）。")]
        [SerializeField] private Transform       _container;
        [SerializeField] private AbilityCellView _cellPrefab;

        [Header("引用")]
        [SerializeField] private Button _btnClose;

        [Header("Event Channels")]
        [Tooltip("能力解锁广播（AbilityType payload），用于实时刷新。对应 EVT_AbilityUnlocked。")]
        [SerializeField] private AbilityTypeEventChannelSO _onAbilityUnlocked;

        private readonly List<(AbilityCellView view, AbilityType type)> _cells = new();
        private readonly CompositeDisposable _subs = new();
        private PlayerStats _stats;

        private void Awake() => _btnClose?.onClick.AddListener(OnClose);

        private void OnEnable()
        {
            _onAbilityUnlocked?.Subscribe(_ => RefreshStates()).AddTo(_subs);
            _stats = FindObjectOfType<PlayerStats>(true);   // 游戏内有玩家；菜单态为 null（全部显示未解锁）
            BuildList();
        }

        private void OnDisable() => _subs.Clear();

        /// <summary>据 AbilityMetaSO 重建能力格（public 以便编辑器/测试）。</summary>
        public void BuildList()
        {
            ClearList();
            if (_meta == null || _container == null || _cellPrefab == null) return;
            foreach (var item in _meta.Items)
            {
                var cell = Instantiate(_cellPrefab, _container);
                cell.gameObject.SetActive(true);
                cell.Bind(item.labelKey, item.icon, IsUnlocked(item.type));
                _cells.Add((cell, item.type));
            }
        }

        private void RefreshStates()
        {
            if (_stats == null) _stats = FindObjectOfType<PlayerStats>(true);
            foreach (var (view, type) in _cells)
                if (view != null) view.SetUnlocked(IsUnlocked(type));
        }

        private bool IsUnlocked(AbilityType type) => _stats != null && _stats.HasAbility(type);

        private void ClearList()
        {
            _cells.Clear();
            if (_container == null) return;
            for (int i = _container.childCount - 1; i >= 0; i--)
            {
                var c = _container.GetChild(i).gameObject;
                if (Application.isPlaying) Destroy(c); else DestroyImmediate(c);
            }
        }

        private void OnClose()
        {
            var uiMgr = ServiceLocator.GetOrDefault<UIManager>();
            if (uiMgr != null) uiMgr.CloseTopPanel();
            else gameObject.SetActive(false);
        }
    }
}