using System;
using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEditor.UIElements;
using UnityEngine;
using UnityEngine.UIElements;
using BaseGames.Enemies;

namespace BaseGames.Editor.Enemies
{
    /// <summary>
    /// 敌人数据管理窗口（W-05）。
    /// 技术：UI Toolkit TwoPaneSplitView + 手动标签页。
    /// 菜单：BaseGames / Data / Enemy Data Manager
    ///
    /// 左栏：可搜索的 EnemyStatsSO 列表 + [新建] 按钮。
    /// 右栏两个标签页：
    ///   Stats  — EnemyStatsSO 完整属性编辑
    ///   Loot   — LootTableSO 浏览与编辑
    /// </summary>
    public class EnemyDataWindow : EditorWindow
    {
        private static readonly StyleSheet _sharedUSS;

        static EnemyDataWindow()
        {
            _sharedUSS = AssetDatabase.LoadAssetAtPath<StyleSheet>(
                "Assets/_Game/Scripts/Editor/UIToolkit/Editor.uss");
        }

        [MenuItem("BaseGames/Data/Enemy Data Manager", priority = 102)]
        public static void Open()
        {
            var wnd = GetWindow<EnemyDataWindow>();
            wnd.titleContent = new GUIContent("Enemy Data Manager");
            wnd.minSize = new Vector2(720, 420);
        }

        // ── 状态 ─────────────────────────────────────────────────────────────
        private List<EnemyStatsSO> _enemies   = new();
        private List<EnemyStatsSO> _filtered  = new();
        private List<LootTableSO>  _lootTables = new();
        private List<LootTableSO>  _lootFiltered = new();

        private ListView      _enemyList;
        private ListView      _lootList;
        private VisualElement _detailRoot;       // Stats 标签页 Loot 详情区
        private ScrollView    _lootDetailRoot;   // Loot 标签页 LootTable 详情区
        private VisualElement _tabStats;
        private VisualElement _tabLoot;
        private Button        _btnStats;
        private Button        _btnLoot;
        private string        _searchText     = "";
        private string        _lootSearchText = "";
        private int           _activeTab      = 0;         // 0=Stats, 1=Loot

        private InspectorElement _statsInspector;
        private InspectorElement _lootInspector;

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

        public void CreateGUI()
        {
            if (_sharedUSS != null)
                rootVisualElement.styleSheets.Add(_sharedUSS);

            // Toolbar
            var toolbar = new Toolbar();
            var searchField = new ToolbarSearchField { style = { flexGrow = 1 } };
            searchField.RegisterValueChangedCallback(e => { _searchText = e.newValue; RefreshEnemyFilter(); });
            searchField.tooltip = "按名称 / ID 过滤 EnemyStatsSO 列表";
            toolbar.Add(searchField);

            var btnCreate  = new ToolbarButton(CreateNewEnemyStats) { text = "+ 新建敌人" };
            var btnRefresh = new ToolbarButton(RefreshAll)           { text = "↺" };
            btnRefresh.tooltip = "重新扫描 Project 中的资产";
            toolbar.Add(btnCreate);
            toolbar.Add(btnRefresh);
            rootVisualElement.Add(toolbar);

            // Split view
            var split = new TwoPaneSplitView(0, 230, TwoPaneSplitViewOrientation.Horizontal);

            // ── 左栏：敌人列表 ────────────────────────────────────────────
            var leftPane = new VisualElement { style = { minWidth = 150 } };
            _enemyList = new ListView
            {
                selectionType   = SelectionType.Single,
                fixedItemHeight = 22,
                makeItem        = MakeEnemyItem,
                bindItem        = BindEnemyItem,
                style           = { flexGrow = 1 },
            };
            _enemyList.selectionChanged += OnEnemySelected;
            leftPane.Add(_enemyList);
            split.Add(leftPane);

            // ── 右栏：标签页 + 内容 ───────────────────────────────────────
            var rightPane = new VisualElement { style = { flexGrow = 1 } };

            // 标签页按钮栏
            var tabBar = new VisualElement();
            tabBar.AddToClassList("tab-bar");

            _btnStats = new Button(() => ActivateTab(0)) { text = "Stats" };
            _btnLoot  = new Button(() => ActivateTab(1)) { text = "Loot Table" };
            _btnStats.AddToClassList("tab-button");
            _btnLoot.AddToClassList("tab-button");
            tabBar.Add(_btnStats);
            tabBar.Add(_btnLoot);
            rightPane.Add(tabBar);

            // Stats 面板
            _tabStats = new ScrollView { style = { flexGrow = 1 } };
            _tabStats.AddToClassList("detail-panel");
            rightPane.Add(_tabStats);

            // Loot 面板（初始隐藏）
            _tabLoot = BuildLootPanel();
            _tabLoot.style.display = DisplayStyle.None;
            rightPane.Add(_tabLoot);

            split.Add(rightPane);
            rootVisualElement.Add(split);

            ActivateTab(0);
            RefreshAll();
        }

        private void OnFocus() => RefreshAll();

        // ── 标签页切换 ────────────────────────────────────────────────────────

        private void ActivateTab(int tab)
        {
            _activeTab = tab;

            _tabStats.style.display = tab == 0 ? DisplayStyle.Flex : DisplayStyle.None;
            _tabLoot.style.display  = tab == 1 ? DisplayStyle.Flex : DisplayStyle.None;

            _btnStats.EnableInClassList("tab-button--active", tab == 0);
            _btnLoot.EnableInClassList("tab-button--active",  tab == 1);
        }

        // ── 敌人列表 ──────────────────────────────────────────────────────────

        private void RefreshAll()
        {
            _enemies = EditorScaffoldUtils.FindAllAssetsOfType<EnemyStatsSO>();
            _enemies.Sort((a, b) => string.Compare(a.name, b.name, StringComparison.OrdinalIgnoreCase));

            _lootTables = EditorScaffoldUtils.FindAllAssetsOfType<LootTableSO>();
            _lootTables.Sort((a, b) => string.Compare(a.name, b.name, StringComparison.OrdinalIgnoreCase));

            RefreshEnemyFilter();
            RefreshLootFilter();
        }

        private void RefreshEnemyFilter()
        {
            _filtered = string.IsNullOrEmpty(_searchText)
                ? new List<EnemyStatsSO>(_enemies)
                : _enemies.Where(e => e != null &&
                    e.name.Contains(_searchText, StringComparison.OrdinalIgnoreCase)).ToList();
            _enemyList.itemsSource = _filtered;
            _enemyList.Rebuild();
        }

        private static VisualElement MakeEnemyItem()
        {
            var label = new Label();
            label.AddToClassList("list-item");
            return label;
        }

        private void BindEnemyItem(VisualElement element, int index)
        {
            var label = (Label)element;
            var enemy = _filtered.Count > index ? _filtered[index] : null;
            label.text = enemy != null ? enemy.name : "(null)";
        }

        private void OnEnemySelected(IEnumerable<object> items)
        {
            _tabStats.Clear();
            _statsInspector = null;

            var enemy = items.FirstOrDefault() as EnemyStatsSO;
            if (enemy == null) return;

            // 数值快览条
            BuildStatsPreview(enemy);

            // 完整属性编辑
            _statsInspector = new InspectorElement(enemy);
            _tabStats.Add(_statsInspector);

            // 操作按钮
            var btnRow = new VisualElement();
            btnRow.AddToClassList("action-buttons");
            btnRow.Add(new Button(() => EditorScaffoldUtils.PingAndSelect(enemy)) { text = "在 Project 中定位" });
            btnRow.Add(new Button(() => Selection.activeObject = enemy)           { text = "在 Inspector 中打开" });
            btnRow.Add(new Button(() => CloneEnemy(enemy))                        { text = "克隆为变体…" });
            _tabStats.Add(btnRow);
        }

        private void BuildStatsPreview(EnemyStatsSO e)
        {
            var row = new VisualElement();
            row.AddToClassList("stats-preview");

            void Stat(string label, string val)
            {
                row.Add(new Label(label) { style = { color = new Color(0.65f, 0.65f, 0.65f), marginRight = 3 } });
                row.Add(new Label(val)   { style = { marginRight = 14, unityFontStyleAndWeight = FontStyle.Bold } });
            }

            Stat("HP：",   $"{e.MaxHP}");
            Stat("DEF：",  $"{e.Defense}");
            Stat("ATK：",  $"{e.AttackDamage}");
            Stat("SPD：",  $"{e.WalkSpeed}/{e.RunSpeed}");
            Stat("范围：", $"{e.AttackRange:F1}");
            Stat("视野：", $"{e.DetectRange:F1}");

            _tabStats.Add(row);
        }

        private void CloneEnemy(EnemyStatsSO source)
        {
            string name  = source.name;
            string clone = EditorUtility.SaveFilePanelInProject(
                "克隆敌人配置", $"{name}_Clone", "asset",
                "选择克隆 EnemyStatsSO 的保存路径");
            if (string.IsNullOrEmpty(clone)) return;

            var asset = Instantiate(source);
            AssetDatabase.CreateAsset(asset, clone);
            AssetDatabase.SaveAssets();
            EditorScaffoldUtils.PingAndSelect(asset);
            RefreshAll();
        }

        // ── Loot Table 面板 ───────────────────────────────────────────────────

        private VisualElement BuildLootPanel()
        {
            var container = new VisualElement { style = { flexGrow = 1 } };

            // Loot 搜索栏
            var lootToolbar = new Toolbar();
            var lootSearch  = new ToolbarSearchField { style = { flexGrow = 1 } };
            lootSearch.RegisterValueChangedCallback(e => { _lootSearchText = e.newValue; RefreshLootFilter(); });
            lootSearch.tooltip = "过滤 LootTableSO 列表";
            lootToolbar.Add(lootSearch);

            var btnCreateLoot = new ToolbarButton(CreateNewLootTable) { text = "+ 新建 LootTable" };
            lootToolbar.Add(btnCreateLoot);
            container.Add(lootToolbar);

            // 左右分割：Loot 列表 + Loot 详情
            var lootSplit = new TwoPaneSplitView(0, 200, TwoPaneSplitViewOrientation.Horizontal);

            var lootLeft = new VisualElement { style = { minWidth = 120 } };
            _lootList = new ListView
            {
                selectionType   = SelectionType.Single,
                fixedItemHeight = 22,
                makeItem        = () => { var l = new Label(); l.AddToClassList("list-item"); return l; },
                bindItem        = (el, idx) =>
                {
                    var lbl  = (Label)el;
                    var loot = _lootFiltered.Count > idx ? _lootFiltered[idx] : null;
                    lbl.text = loot?.name ?? "(null)";
                },
                style = { flexGrow = 1 },
            };
            _lootList.selectionChanged += OnLootSelected;
            lootLeft.Add(_lootList);
            lootSplit.Add(lootLeft);

            _lootDetailRoot = new ScrollView { style = { flexGrow = 1 } };
            _lootDetailRoot.AddToClassList("detail-panel");
            lootSplit.Add(_lootDetailRoot);

            container.Add(lootSplit);
            return container;
        }

        private void RefreshLootFilter()
        {
            _lootFiltered = string.IsNullOrEmpty(_lootSearchText)
                ? new List<LootTableSO>(_lootTables)
                : _lootTables.Where(l => l != null &&
                    l.name.Contains(_lootSearchText, StringComparison.OrdinalIgnoreCase)).ToList();
            _lootList.itemsSource = _lootFiltered;
            _lootList.Rebuild();
        }

        private void OnLootSelected(IEnumerable<object> items)
        {
            _lootDetailRoot.Clear();
            _lootInspector = null;

            var loot = items.FirstOrDefault() as LootTableSO;
            if (loot == null) return;

            var title = new Label($"Loot：{loot.name}")
            {
                style = { fontSize = 13, unityFontStyleAndWeight = FontStyle.Bold, marginBottom = 6 }
            };
            _lootDetailRoot.Add(title);

            // 简要统计
            int entryCount = loot.Entries?.Length ?? 0;
            _lootDetailRoot.Add(new Label($"条目数：{entryCount}   保底 LingZhu：{loot.GuaranteedLingZhuMin}–{loot.GuaranteedLingZhuMax}")
            {
                style = { color = new Color(0.7f, 0.7f, 0.7f), marginBottom = 4 }
            });

            _lootInspector = new InspectorElement(loot);
            _lootDetailRoot.Add(_lootInspector);

            var btnRow = new VisualElement();
            btnRow.AddToClassList("action-buttons");
            btnRow.Add(new Button(() => EditorScaffoldUtils.PingAndSelect(loot)) { text = "在 Project 中定位" });
            btnRow.Add(new Button(() => Selection.activeObject = loot)           { text = "在 Inspector 中打开" });
            _lootDetailRoot.Add(btnRow);
        }

        // ── 新建资产 ──────────────────────────────────────────────────────────

        private void CreateNewEnemyStats()
        {
            var asset = EditorScaffoldUtils.CreateSOAsset<EnemyStatsSO>(
                "Assets/_Game/Data/Enemies", "EnemyStatsSO_New");
            if (asset != null) RefreshAll();
        }

        private void CreateNewLootTable()
        {
            var asset = EditorScaffoldUtils.CreateSOAsset<LootTableSO>(
                "Assets/_Game/Data/Enemies", "LootTableSO_New");
            if (asset != null) RefreshAll();
        }
    }
}