using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using BaseGames.UI.MainMenu;
using BaseGames.UI.Theme;
using BaseGames.Core.Events;
using BaseGames.Localization;
using BaseGames.Editor.Localization;

namespace BaseGames.Editor.UI
{
    /// <summary>
    /// 新游戏难度选择脚手架：生成 / 更新 <c>UI_NewGameModePanel</c> 预制件 + 默认 <c>UI_NewGameModeConfig</c> 表 + 中英文案。
    /// 该面板是 MainMenu Canvas 的子面板（非独立 Canvas），由 SaveSlotController 经 ShowAsync 模态弹出。
    ///
    /// 美术 → 改 UI_NewGameModePanel 预制件（暗化/对话框/标题/说明/返回样式，难度按钮样式见 UI_MainMenu_Button）；
    /// 策划 → 改 UI_NewGameModeConfig（增删/重排难度、改标签/说明）。
    ///
    /// 菜单：BaseGames/UI/控件库/生成新游戏难度选择（预制件 + 默认配置）
    /// </summary>
    public static class UINewGameModeScaffold
    {
        private const string PrefabDir  = "Assets/_Game/Prefabs/UI";
        private const string ConfigDir  = "Assets/_Game/Data/UI";
        private const string ThemePath  = "Assets/_Game/Data/UI/Themes/UI_Theme_Default.asset";
        private const string PrefabName = "UI_NewGameModePanel";
        private const string ConfigName = "UI_NewGameModeConfig";
        private const string BtnPrefabPath = "Assets/_Game/Prefabs/UI/Controls/UI_MainMenu_Button.prefab";

        [MenuItem("BaseGames/UI/控件库/生成新游戏难度选择（预制件 + 默认配置）")]
        public static void GeneratePrefab()
        {
            EnsureFolder(PrefabDir);
            EnsureFolder(ConfigDir);
            var report = new List<string>();

            var theme  = AssetDatabase.LoadAssetAtPath<UIThemeSO>(ThemePath);
            var config = EnsureDefaultConfig(report);
            SeedLocalization(report);
            BuildPrefab(theme, config, report);

            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();

            var sb = new System.Text.StringBuilder("[UINewGameMode] 难度选择已生成/更新：\n");
            foreach (var r in report) sb.AppendLine("  • " + r);
            sb.AppendLine("用法：重跑「BaseGames/Scene/Setup/Scaffold MainMenu Scene」实例化进 MainMenu（接 SaveSlotController._modeSelect）。");
            Debug.Log(sb.ToString());
        }

        private static void BuildPrefab(UIThemeSO theme, NewGameModeConfigSO config, List<string> report)
        {
            // 根：铺满全屏的面板（非 Canvas；作为 MainMenu Canvas 子节点）。初始隐藏，由导航器激活。
            var root = new GameObject(PrefabName, typeof(RectTransform), typeof(CanvasGroup));
            var rootRt = (RectTransform)root.transform;
            Stretch(rootRt);
            var ctrl = root.AddComponent<NewGameModeController>();
            var applier = root.AddComponent<UIThemeApplier>();
            if (theme != null) AssignRef(applier, "_theme", theme);

            // 暗化遮罩（铺满，挡点击）
            var overlayGo = NewUIChild(root.transform, "Overlay", out var overlayRt);
            Stretch(overlayRt);
            var overlay = overlayGo.AddComponent<Image>();
            overlay.color = new Color(0f, 0f, 0f, 0.6f); overlay.raycastTarget = true;

            // 对话框
            var boxGo = NewUIChild(root.transform, "DialogBox", out var boxRt);
            SetRect(boxRt, new Vector2(0.5f, 0.5f), new Vector2(0.5f, 0.5f), new Vector2(0.5f, 0.5f),
                    Vector2.zero, new Vector2(760f, 520f));
            var box = boxGo.AddComponent<Image>();
            box.sprite = Standard(); box.type = Image.Type.Sliced;
            box.color = new Color(0.10f, 0.11f, 0.15f, 0.98f);
            SetEnum(boxGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Graphic_Background);

            // 标题
            var titleGo = NewUIChild(boxGo.transform, "Title", out var titleRt);
            SetRect(titleRt, new Vector2(0f, 1f), new Vector2(1f, 1f), new Vector2(0.5f, 1f),
                    new Vector2(0f, -50f), new Vector2(-60f, 60f));
            var title = titleGo.AddComponent<TextMeshProUGUI>();
            title.text = "选择难度"; title.alignment = TextAlignmentOptions.Center; title.fontSize = 40f;
            title.raycastTarget = false;
            var titleLoc = titleGo.AddComponent<LocalizedText>();
            SetString(titleLoc, "_key", "MODE_SELECT_TITLE");
            SetEnum(titleGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Text_Header);

            // 难度按钮容器（竖排）
            var optionGo = NewUIChild(boxGo.transform, "OptionContainer", out var optionRt);
            SetRect(optionRt, new Vector2(0.5f, 1f), new Vector2(0.5f, 1f), new Vector2(0.5f, 1f),
                    new Vector2(0f, -130f), new Vector2(460f, 200f));
            var vlg = optionGo.AddComponent<VerticalLayoutGroup>();
            vlg.spacing = 12f; vlg.childAlignment = TextAnchor.UpperCenter;
            vlg.childControlWidth = true; vlg.childControlHeight = true;
            vlg.childForceExpandWidth = true; vlg.childForceExpandHeight = false;

            // 说明文本（选中项时显示）
            var descGo = NewUIChild(boxGo.transform, "DescText", out var descRt);
            SetRect(descRt, new Vector2(0f, 0f), new Vector2(1f, 0f), new Vector2(0.5f, 0f),
                    new Vector2(0f, 130f), new Vector2(-80f, 80f));
            var desc = descGo.AddComponent<TextMeshProUGUI>();
            desc.text = ""; desc.alignment = TextAlignmentOptions.Center; desc.fontSize = 22f;
            desc.color = new Color(0.82f, 0.6f, 0.6f, 1f); desc.raycastTarget = false; desc.enableWordWrapping = true;
            SetEnum(descGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Text_Secondary);

            // 返回按钮
            var backGo = NewUIChild(boxGo.transform, "Btn_Back", out var backRt);
            SetRect(backRt, new Vector2(0.5f, 0f), new Vector2(0.5f, 0f), new Vector2(0.5f, 0f),
                    new Vector2(0f, 46f), new Vector2(260f, 60f));
            var backImg = backGo.AddComponent<Image>();
            backImg.sprite = Standard(); backImg.type = Image.Type.Sliced; backImg.color = new Color(1f, 1f, 1f, 0.06f);
            var backBtn = backGo.AddComponent<Button>(); backBtn.targetGraphic = backImg;
            var backLblGo = NewUIChild(backGo.transform, "Label", out var backLblRt);
            Stretch(backLblRt);
            var backLbl = backLblGo.AddComponent<TextMeshProUGUI>();
            backLbl.text = "返回"; backLbl.alignment = TextAlignmentOptions.Center; backLbl.fontSize = 28f;
            backLblGo.AddComponent<LocalizedText>();
            SetString(backLblGo.GetComponent<LocalizedText>(), "_key", "BTN_BACK");
            SetEnum(backLblGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Text_Primary);

            // 绑定控制器
            AssignRef(ctrl, "_config", config);
            AssignRef(ctrl, "_container", optionRt);
            AssignRef(ctrl, "_canvasGroup", root.GetComponent<CanvasGroup>());
            AssignRef(ctrl, "_titleText", titleLoc);
            AssignRef(ctrl, "_descText", desc);
            AssignRef(ctrl, "_btnBack", backBtn);

            var btnPrefab = AssetDatabase.LoadAssetAtPath<GameObject>(BtnPrefabPath);
            var btnView   = btnPrefab != null ? btnPrefab.GetComponent<MainMenuButtonView>() : null;
            if (btnView == null) report.Add($"未找到按钮预制件 {BtnPrefabPath}（请先运行「生成主菜单」）。");
            AssignRef(ctrl, "_buttonPrefab", btnView);

            root.SetActive(false);   // 结果面板由导航器激活

            string path = $"{PrefabDir}/{PrefabName}.prefab";
            PrefabUtility.SaveAsPrefabAsset(root, path);
            Object.DestroyImmediate(root);
            report.Add(path);
        }

        private static NewGameModeConfigSO EnsureDefaultConfig(List<string> report)
        {
            string path = $"{ConfigDir}/{ConfigName}.asset";
            var cfg = AssetDatabase.LoadAssetAtPath<NewGameModeConfigSO>(path);
            bool created = cfg == null;
            if (created) { cfg = ScriptableObject.CreateInstance<NewGameModeConfigSO>(); AssetDatabase.CreateAsset(cfg, path); }

            if (created)
            {
                var items = new (DifficultyLevel lvl, string label, string desc)[]
                {
                    (DifficultyLevel.Normal,    "MODE_NORMAL",    ""),
                    (DifficultyLevel.SteelSoul, "MODE_STEELSOUL", "MODE_STEELSOUL_DESC"),
                };
                var so = new SerializedObject(cfg);
                var prop = so.FindProperty("_items");
                prop.arraySize = items.Length;
                for (int i = 0; i < items.Length; i++)
                {
                    var el = prop.GetArrayElementAtIndex(i);
                    el.FindPropertyRelative("level").enumValueIndex = (int)items[i].lvl;
                    el.FindPropertyRelative("labelKey").stringValue = items[i].label;
                    el.FindPropertyRelative("descKey").stringValue  = items[i].desc;
                }
                so.ApplyModifiedPropertiesWithoutUndo();
                report.Add($"{path}（默认 {items.Length} 项：普通 / 钢铁之魂）");
            }
            return cfg;
        }

        private static void SeedLocalization(List<string> report)
        {
            var zh = new Dictionary<string, string>
            {
                { "MODE_SELECT_TITLE",   "选择难度" },
                { "MODE_NORMAL",         "普通" },
                { "MODE_STEELSOUL",      "钢铁之魂" },
                { "MODE_STEELSOUL_DESC", "一命模式：死亡即清空存档，请谨慎选择。" },
                { "BTN_BACK",            "返回" },
            };
            var en = new Dictionary<string, string>
            {
                { "MODE_SELECT_TITLE",   "Select Mode" },
                { "MODE_NORMAL",         "Normal" },
                { "MODE_STEELSOUL",      "Steel Soul" },
                { "MODE_STEELSOUL_DESC", "One life. Death wipes the save — choose with care." },
                { "BTN_BACK",            "Back" },
            };
            int added = MergeWriteUI(Language.ChineseSimplified, zh) + MergeWriteUI(Language.English, en);
            report.Add($"本地化新增 {added} 条（已存在不覆盖）。");
        }

        private static int MergeWriteUI(Language lang, Dictionary<string, string> kv)
        {
            var dict = LocalizationFileIO.Read(lang, LocalizationTable.UI);
            int added = 0;
            foreach (var p in kv)
                if (!dict.ContainsKey(p.Key)) { dict[p.Key] = p.Value; added++; }
            if (added > 0) LocalizationFileIO.Write(lang, LocalizationTable.UI, dict);
            return added;
        }

        // ── 助手 ─────────────────────────────────────────────────────────────
        private static GameObject NewUIChild(Transform parent, string name, out RectTransform rt)
        {
            var go = new GameObject(name, typeof(RectTransform));
            rt = (RectTransform)go.transform;
            rt.SetParent(parent, false);
            return go;
        }

        private static void Stretch(RectTransform rt)
        {
            rt.anchorMin = Vector2.zero; rt.anchorMax = Vector2.one;
            rt.offsetMin = Vector2.zero; rt.offsetMax = Vector2.zero;
        }

        private static void SetRect(RectTransform rt, Vector2 aMin, Vector2 aMax, Vector2 pivot,
            Vector2 anchoredPos, Vector2 size)
        {
            rt.anchorMin = aMin; rt.anchorMax = aMax; rt.pivot = pivot;
            rt.anchoredPosition = anchoredPos; rt.sizeDelta = size;
        }

        private static void SetEnum(Component c, string prop, int value)
        {
            var so = new SerializedObject(c);
            var p  = so.FindProperty(prop);
            if (p != null) { p.enumValueIndex = value; so.ApplyModifiedPropertiesWithoutUndo(); }
        }

        private static void SetString(Component c, string prop, string value)
        {
            if (c == null) return;
            var so = new SerializedObject(c);
            var p  = so.FindProperty(prop);
            if (p != null) { p.stringValue = value; so.ApplyModifiedPropertiesWithoutUndo(); }
        }

        private static void AssignRef(Object target, string prop, Object value)
        {
            var so = new SerializedObject(target);
            var p  = so.FindProperty(prop);
            if (p == null) { Debug.LogWarning($"[UINewGameMode] 未找到属性 {target.GetType().Name}.{prop}"); return; }
            p.objectReferenceValue = value;
            so.ApplyModifiedPropertiesWithoutUndo();
        }

        private static Sprite Standard() => AssetDatabase.GetBuiltinExtraResource<Sprite>("UI/Skin/UISprite.psd");

        private static void EnsureFolder(string dir)
        {
            string[] parts = dir.Split('/');
            string cur = parts[0];
            for (int i = 1; i < parts.Length; i++)
            {
                string next = $"{cur}/{parts[i]}";
                if (!AssetDatabase.IsValidFolder(next)) AssetDatabase.CreateFolder(cur, parts[i]);
                cur = next;
            }
        }
    }
}