using System;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using BaseGames.Core.Save;
using BaseGames.Localization;
using BaseGames.World.Map;

namespace BaseGames.UI.Menus
{
    /// <summary>
    /// 单个存档槽卡片组件，负责显示存档摘要或空槽提示。
    ///
    /// ⚠ 必须独立成文件：Unity 仅为与文件名同名的类生成 MonoScript 资产，
    /// 若与 SaveSlotController 合并在同一文件，AddComponent 后脚本引用会丢失（Missing Script）。
    /// </summary>
    public class SaveSlotUI : MonoBehaviour
    {
        [Header("基本信息")]
        [SerializeField] private TMP_Text   _playtimeText;
        [SerializeField] private TMP_Text   _regionText;
        [SerializeField] private TMP_Text   _lastSavedText;
        [SerializeField] private Image      _formIcon;

        [Header("扩展信息（可选）")]
        [Tooltip("货币（灵珠）持有量文本。")]
        [SerializeField] private TMP_Text   _lingZhuText;
        [Tooltip("生命（面具）上限文本。")]
        [SerializeField] private TMP_Text   _hpText;
        [Tooltip("钢铁之魂徽章根节点，仅一命模式存档显示。")]
        [SerializeField] private GameObject _steelSoulBadge;

        [Header("区域背景图")]
        [Tooltip("RegionRegistry.asset，用于根据 SceneName 查找区域背景图。")]
        [SerializeField] private RegionRegistrySO _regionRegistry;
        [Tooltip("存档点不在任何已注册区域时显示的默认背景图。")]
        [SerializeField] private Sprite           _fallbackBackground;
        [Tooltip("显示区域背景图的 Image 组件。")]
        [SerializeField] private Image            _backgroundImage;

        [Header("槽位状态")]
        [SerializeField] private GameObject _emptyIndicator;  // 空槽时显示的"新游戏"提示
        [SerializeField] private GameObject _dataIndicator;   // 有数据时显示的内容根
        [SerializeField] private Button     _selectButton;
        [SerializeField] private Button     _deleteButton;

        private int                _slotIndex;
        private SaveSlotController _controller;

        /// <summary>由 SaveSlotController 在 Awake 时调用以完成按钮绑定。</summary>
        public void Init(int slotIndex, SaveSlotController controller)
        {
            _slotIndex  = slotIndex;
            _controller = controller;

            if (_selectButton != null)
            {
                _selectButton.onClick.RemoveAllListeners();
                _selectButton.onClick.AddListener(() => _controller.OnSlotSelected(_slotIndex));
            }

            if (_deleteButton != null)
            {
                _deleteButton.onClick.RemoveAllListeners();
                // 删除统一走 Controller → 通用确认对话框（不再使用每卡内联确认）
                _deleteButton.onClick.AddListener(() => _controller.OnSlotDeleteRequested(_slotIndex));
            }
        }

        /// <summary>用摘要数据刷新显示；summary 为 null 表示空槽。</summary>
        /// <param name="summary">槽位摘要，null 为空槽。</param>
        /// <param name="mode">当前面板模式：继续模式下空槽不可选。</param>
        public void Refresh(SlotSummary summary, SaveSlotPanelMode mode)
        {
            bool hasData = summary != null;

            if (_emptyIndicator != null) _emptyIndicator.SetActive(!hasData);
            if (_dataIndicator  != null) _dataIndicator.SetActive(hasData);
            if (_deleteButton   != null) _deleteButton.gameObject.SetActive(hasData);

            // 继续模式下空槽不可选；新游戏模式下空槽可选（建新档）
            if (_selectButton != null)
                _selectButton.interactable = hasData || mode == SaveSlotPanelMode.NewGame;

            if (_steelSoulBadge != null)
                _steelSoulBadge.SetActive(hasData && summary.IsSteelSoul);

            if (!hasData) return;

            if (_playtimeText != null) _playtimeText.text = FormatPlaytime(summary.Playtime);

            if (_regionText != null)
            {
                string key = summary.SceneName ?? string.Empty;
                string loc = !string.IsNullOrEmpty(key)
                    ? LocalizationManager.Get(key, LocalizationTable.UI)
                    : null;
                _regionText.text = !string.IsNullOrEmpty(loc) && loc != key ? loc : key;
            }

            if (_lastSavedText != null) _lastSavedText.text = FormatDateTime(summary.LastSaved);
            if (_lingZhuText   != null) _lingZhuText.text   = summary.CurrentLingZhu.ToString();
            if (_hpText        != null) _hpText.text        = summary.MaxHP.ToString();

            RefreshBackground(summary);
        }

        private void RefreshBackground(SlotSummary summary)
        {
            if (_backgroundImage == null) return;

            Sprite bg = null;
            if (summary != null && !string.IsNullOrEmpty(summary.SceneName))
                bg = _regionRegistry?.FindBySceneName(summary.SceneName)?.saveSlotBackground;

            _backgroundImage.sprite  = bg != null ? bg : _fallbackBackground;
            _backgroundImage.enabled = _backgroundImage.sprite != null;
        }

        // ── 格式化工具 ────────────────────────────────────────────────────────

        private static string FormatPlaytime(float seconds)
        {
            int h = (int)(seconds / 3600);
            int m = (int)((seconds % 3600) / 60);
            int s = (int)(seconds % 60);
            return $"{h:D2}:{m:D2}:{s:D2}";
        }

        private static string FormatDateTime(string iso8601)
        {
            if (string.IsNullOrEmpty(iso8601)) return string.Empty;
            if (DateTime.TryParse(iso8601,
                    System.Globalization.CultureInfo.InvariantCulture,
                    System.Globalization.DateTimeStyles.RoundtripKind,
                    out DateTime dt))
            {
                return dt.ToLocalTime().ToString("yyyy-MM-dd HH:mm");
            }
            return iso8601;
        }
    }
}