using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using BaseGames.Core;
using BaseGames.Core.Events;
using BaseGames.Skills;
using BaseGames.Localization;

namespace BaseGames.UI
{
    /// <summary>
    /// 形态技能一览面板（架构 10_UIModule §Panel）。
    /// 只读面板：按形态展示各技能槽的技能资料（名称、描述、消耗、冷却），不含任何解锁/技能点交互。
    /// 支持左右翻页浏览各形态，并高亮当前实际使用的形态。
    ///
    /// Inspector 必填：
    ///   _formSkillSets          — 每个形态对应一条配置（soulSkill + spirit1 + spirit2）
    ///   _formTitleText          — 显示当前形态标签名的文本
    ///   _prevFormBtn / _nextFormBtn — 翻页按钮
    ///   _activeFormIndicator    — 高亮"当前形态"的标志（可选，如小圆点）
    ///   _skillSlots             — 3 个 SkillSlotView 引用（Soul / Spirit1 / Spirit2）
    ///   _onFormChanged          — IntEventChannelSO，FormController 广播当前形态 index
    /// </summary>
    public class FormSkillPanel : MonoBehaviour
    {
        // ── 子数据结构 ────────────────────────────────────────────────────────

        [System.Serializable]
        public struct FormSkillConfig
        {
            [Tooltip("形态标题的本地化 Key，格式如 \"Form_SkyWarden_Label\"，由 LocalizationManager.Get(…, LocalizationTable.UI) 查找。")]
            public string        formLabelKey;
            [Tooltip("天魂/地魂/命魂的「魂技」")]
            public FormSkillSO   soulSkill;
            [Tooltip("灵技 1（Y / Triangle / 手柄按钮）")]
            public FormSkillSO   spiritSkill1;
            [Tooltip("灵技 2（Shift+Y / L2+Triangle 等）")]
            public FormSkillSO   spiritSkill2;
        }

        [System.Serializable]
        public struct SkillSlotView
        {
            [Tooltip("技能图标")]
            public Image   icon;
            [Tooltip("技能名称文本")]
            public TMP_Text nameText;
            [Tooltip("技能描述文本")]
            public TMP_Text descText;
            [Tooltip("消耗数值文本（如 \"魂力 25\"）")]
            public TMP_Text costText;
            [Tooltip("冷却数值文本（如 \"CD 3.5s\"）")]
            public TMP_Text cooldownText;
            [Tooltip("无技能时隐藏的根 GameObject")]
            public GameObject root;
        }

        // ── Inspector 字段 ────────────────────────────────────────────────────

        [Header("形态技能配置")]
        [Tooltip("每个元素对应一种形态的三项技能，顺序应与 FormType 枚举序号一致。")]
        [SerializeField] private FormSkillConfig[] _formSkillSets;

        [Header("UI 导航")]
        [SerializeField] private TMP_Text   _formTitleText;
        [SerializeField] private Button     _prevFormBtn;
        [SerializeField] private Button     _nextFormBtn;
        [Tooltip("高亮当前实际装备形态的指示器（可选）")]
        [SerializeField] private GameObject _activeFormIndicator;

        [Header("技能卡槽（Soul / Spirit1 / Spirit2）")]
        [SerializeField] private SkillSlotView _soulSlot;
        [SerializeField] private SkillSlotView _spiritSlot1;
        [SerializeField] private SkillSlotView _spiritSlot2;

        [Header("关闭按钮")]
        [SerializeField] private Button _btnClose;

        [Header("Event Channels")]
        [Tooltip("FormController 广播当前形态切换：payload = FormType 的整数序号（0=天魂,1=地魂,2=命魂）")]
        [SerializeField] private IntEventChannelSO _onFormChanged;

        // ── 私有状态 ──────────────────────────────────────────────────────────

        private int _viewIndex   = 0;   // 当前正在查看的形态
        private int _activeIndex = 0;   // 玩家当前实际使用的形态
        private readonly CompositeDisposable _subs = new();

        // ── 生命周期 ──────────────────────────────────────────────────────────

        private void Awake()
        {
            _prevFormBtn?.onClick.AddListener(PrevForm);
            _nextFormBtn?.onClick.AddListener(NextForm);
            _btnClose?.onClick.AddListener(OnCloseClicked);
        }

        private void OnEnable()
        {
            _onFormChanged?.Subscribe(OnFormChanged).AddTo(_subs);
            // 打开时自动跳到当前形态
            _viewIndex = _activeIndex;
            Refresh();
        }

        private void OnDisable()
        {
            _subs.Clear();
        }

        // ── 事件处理 ──────────────────────────────────────────────────────────

        private void OnFormChanged(int formIndex)
        {
            _activeIndex = formIndex;
            if (_activeFormIndicator != null)
                _activeFormIndicator.SetActive(_viewIndex == _activeIndex);
        }

        // ── 导航 ──────────────────────────────────────────────────────────────

        private void PrevForm()
        {
            if (_formSkillSets == null || _formSkillSets.Length == 0) return;
            _viewIndex = (_viewIndex - 1 + _formSkillSets.Length) % _formSkillSets.Length;
            Refresh();
        }

        private void NextForm()
        {
            if (_formSkillSets == null || _formSkillSets.Length == 0) return;
            _viewIndex = (_viewIndex + 1) % _formSkillSets.Length;
            Refresh();
        }

        // ── 显示刷新 ──────────────────────────────────────────────────────────

        private void Refresh()
        {
            if (_formSkillSets == null || _formSkillSets.Length == 0) return;
            _viewIndex = Mathf.Clamp(_viewIndex, 0, _formSkillSets.Length - 1);

            var cfg = _formSkillSets[_viewIndex];

            // 标题（走本地化管道，fallback 为 key 本身）
            if (_formTitleText != null)
            {
                string label = !string.IsNullOrEmpty(cfg.formLabelKey)
                    ? LocalizationManager.Get(cfg.formLabelKey, LocalizationTable.UI)
                    : string.Empty;
                _formTitleText.text = string.IsNullOrEmpty(label) || label == cfg.formLabelKey
                    ? cfg.formLabelKey   // fallback：直接显示 Key
                    : label;
            }

            // 当前形态高亮指示器
            if (_activeFormIndicator != null)
                _activeFormIndicator.SetActive(_viewIndex == _activeIndex);

            // 翻页按钮可见性（只有一种形态时隐藏）
            bool multiForm = _formSkillSets.Length > 1;
            if (_prevFormBtn != null) _prevFormBtn.gameObject.SetActive(multiForm);
            if (_nextFormBtn != null) _nextFormBtn.gameObject.SetActive(multiForm);

            // 技能卡槽
            FillSlot(ref _soulSlot,    cfg.soulSkill);
            FillSlot(ref _spiritSlot1, cfg.spiritSkill1);
            FillSlot(ref _spiritSlot2, cfg.spiritSkill2);
        }

        private static void FillSlot(ref SkillSlotView slot, FormSkillSO skill)
        {
            bool hasSkill = skill != null;
            if (slot.root != null) slot.root.SetActive(hasSkill);
            if (!hasSkill) return;

            if (slot.icon != null)
            {
                slot.icon.sprite  = skill.icon;
                slot.icon.enabled = skill.icon != null;
            }

            if (slot.nameText != null)
            {
                string name = LocalizationManager.Get(skill.displayNameKey, LocalizationTable.UI);
                slot.nameText.text = string.IsNullOrEmpty(name) || name == skill.displayNameKey
                    ? skill.skillId
                    : name;
            }

            if (slot.descText != null)
            {
                string desc = LocalizationManager.Get(skill.descriptionKey, LocalizationTable.UI);
                slot.descText.text = string.IsNullOrEmpty(desc) || desc == skill.descriptionKey
                    ? string.Empty
                    : desc;
            }

            if (slot.costText != null)
                slot.costText.text = skill.baseCost > 0
                    ? $"{skill.resourceType} {skill.baseCost}"
                    : string.Empty;

            if (slot.cooldownText != null)
                slot.cooldownText.text = skill.cooldown > 0f
                    ? $"CD {skill.cooldown:0.#}s"
                    : string.Empty;
        }

        // ── 关闭 ──────────────────────────────────────────────────────────────

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