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

namespace BaseGames.Editor.UI
{
    /// <summary>
    /// 加载界面脚手架：一键生成 / 更新 <c>UI_LoadingScreen</c> 预制件 + 默认 <c>UI_LoadingConfig</c> 数据表，
    /// 并补充默认中/英文案。对齐项目「Prefab（样式/美术）+ Config（数据）+ Theme（配色）」范式。
    ///
    /// <para>生成后策划美术编辑方式：</para>
    /// <list type="bullet">
    ///   <item>美术：双击 <c>UI_LoadingScreen.prefab</c> 进 Prefab Mode，改背景图 / 进度条 sprite / 字体 / 加装饰 / 调布局。</item>
    ///   <item>策划：选 <c>UI_LoadingConfig.asset</c>，改提示文案 key、标题 key、加载时长/手感。</item>
    ///   <item>配色：改 <c>UI_Theme_Default</c>（带 UIThemeRole 的元素自动套用）。</item>
    /// </list>
    ///
    /// 菜单：BaseGames/UI/控件库/生成加载界面（预制件 + 默认配置）
    /// </summary>
    public static class UILoadingScreenScaffold
    {
        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_LoadingScreen";
        private const string ConfigName = "UI_LoadingConfig";

        [MenuItem("BaseGames/UI/控件库/生成加载界面（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("[UILoadingScreen] 加载界面已生成/更新：\n");
            foreach (var r in report) sb.AppendLine("  • " + r);
            sb.AppendLine("用法：重跑「BaseGames/Scene/Setup/Scaffold Persistent Scene」把预制件实例化进 Persistent。");
            sb.AppendLine("美术改样式 → 编辑 UI_LoadingScreen 预制件；策划改内容 → 编辑 UI_LoadingConfig；配色 → UI_Theme_Default。");
            Debug.Log(sb.ToString());
        }

        // ── 预制件构建 ───────────────────────────────────────────────────────
        private static void BuildPrefab(UIThemeSO theme, LoadingScreenConfigSO config, List<string> report)
        {
            // 根：全屏 Overlay Canvas（常驻 active；LoadingScreenManager 挂此处，靠保持 active 才能订阅事件）
            var root = new GameObject(PrefabName,
                typeof(RectTransform), typeof(Canvas), typeof(CanvasScaler), typeof(GraphicRaycaster));
            var canvas = root.GetComponent<Canvas>();
            canvas.renderMode  = RenderMode.ScreenSpaceOverlay;
            canvas.sortingOrder = 99;
            var scaler = root.GetComponent<CanvasScaler>();
            scaler.uiScaleMode         = CanvasScaler.ScaleMode.ScaleWithScreenSize;
            scaler.referenceResolution = new Vector2(1920f, 1080f);
            scaler.screenMatchMode     = CanvasScaler.ScreenMatchMode.MatchWidthOrHeight;
            scaler.matchWidthOrHeight  = 0.5f;
            var mgr = root.AddComponent<LoadingScreenManager>();

            // LoadingRoot：铺满全屏，初始 inactive（由管理器 Show/Hide 切换）。
            // 主题应用器挂在此处：每次 Show（SetActive true）时 OnEnable 应用主题配色。
            var loadingRootGo = NewUIChild(root.transform, "LoadingRoot", out var loadingRootRt);
            Stretch(loadingRootRt);
            var applier = loadingRootGo.AddComponent<UIThemeApplier>();
            if (theme != null) AssignRef(applier, "_theme", theme);

            // Background（铺满）：美术可换 sprite，或复制多个变体作随机背景池
            var bgGo = NewUIChild(loadingRootGo.transform, "Background", out var bgRt);
            Stretch(bgRt);
            var bgImg = bgGo.AddComponent<Image>();
            bgImg.color = new Color(0.04f, 0.05f, 0.07f, 1f);
            SetEnum(bgGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Graphic_Background);

            // ProgressBarTrack（底部居中）+ ProgressBarFill
            var trackGo = NewUIChild(loadingRootGo.transform, "ProgressBarTrack", out var trackRt);
            SetRect(trackRt, new Vector2(0.5f, 0f), new Vector2(0.5f, 0f), new Vector2(0.5f, 0f),
                    new Vector2(0f, 90f), new Vector2(760f, 14f));
            var trackImg = trackGo.AddComponent<Image>();
            trackImg.sprite = Standard(); trackImg.type = Image.Type.Sliced;
            trackImg.color = new Color(1f, 1f, 1f, 0.12f);
            trackImg.raycastTarget = false;

            var fillGo = NewUIChild(trackGo.transform, "ProgressBarFill", out var fillRt);
            Stretch(fillRt);
            var fillImg = fillGo.AddComponent<Image>();
            fillImg.sprite        = Standard();
            fillImg.type          = Image.Type.Filled;
            fillImg.fillMethod    = Image.FillMethod.Horizontal;
            fillImg.fillOrigin    = (int)Image.OriginHorizontal.Left;
            fillImg.fillAmount    = 0f;
            fillImg.color         = new Color(0.85f, 0.80f, 0.55f, 1f);
            fillImg.raycastTarget = false;
            SetEnum(fillGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Graphic_Accent);

            // Title（居中偏上）
            var titleGo = NewUIChild(loadingRootGo.transform, "Title", out var titleRt);
            SetRect(titleRt, new Vector2(0.5f, 0.5f), new Vector2(0.5f, 0.5f), new Vector2(0.5f, 0.5f),
                    new Vector2(0f, 60f), new Vector2(1200f, 80f));
            var title = titleGo.AddComponent<TextMeshProUGUI>();
            title.text = "Loading"; title.alignment = TextAlignmentOptions.Center; title.fontSize = 56f;
            title.raycastTarget = false;
            SetEnum(titleGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Text_Header);

            // TipText（进度条上方）
            var tipGo = NewUIChild(loadingRootGo.transform, "TipText", out var tipRt);
            SetRect(tipRt, new Vector2(0.5f, 0f), new Vector2(0.5f, 0f), new Vector2(0.5f, 0f),
                    new Vector2(0f, 130f), new Vector2(1200f, 48f));
            var tip = tipGo.AddComponent<TextMeshProUGUI>();
            tip.text = ""; tip.alignment = TextAlignmentOptions.Center; tip.fontSize = 28f;
            tip.raycastTarget = false;
            SetEnum(tipGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Text_Secondary);

            // 绑定管理器视图引用 + 数据/事件（让预制件自足，掉哪都能用）
            AssignRef(mgr, "_loadingRoot",   loadingRootGo);
            AssignRef(mgr, "_progressFill",  fillImg);
            AssignRef(mgr, "_titleText",     title);
            AssignRef(mgr, "_tipText",       tip);
            AssignArray(mgr, "_backgroundArts", new Object[] { bgImg });
            AssignRef(mgr, "_config",        config);
            AssignRef(mgr, "_onLoadingStarted",         FindAsset<VoidEventChannelSO>("EVT_LoadingStarted"));
            AssignRef(mgr, "_onLoadingComplete",        FindAsset<VoidEventChannelSO>("EVT_LoadingComplete"));
            AssignRef(mgr, "_onLoadingProgressUpdated", FindAsset<FloatEventChannelSO>("EVT_LoadingProgressUpdated"));

            // 关键：Canvas 根保持 active，仅 LoadingRoot 初始隐藏（否则管理器被自己关闭、永不订阅事件）
            loadingRootGo.SetActive(false);

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

        // ── 默认配置资产 ─────────────────────────────────────────────────────
        private static LoadingScreenConfigSO EnsureDefaultConfig(List<string> report)
        {
            string path = $"{ConfigDir}/{ConfigName}.asset";
            var cfg = AssetDatabase.LoadAssetAtPath<LoadingScreenConfigSO>(path);
            bool created = cfg == null;
            if (created)
            {
                cfg = ScriptableObject.CreateInstance<LoadingScreenConfigSO>();
                AssetDatabase.CreateAsset(cfg, path);
            }
            if (created)   // 仅新建时填默认，避免覆盖策划已有编辑
            {
                var so = new SerializedObject(cfg);
                so.FindProperty("_titleKey").stringValue = "LOADING_TITLE";
                var tips = so.FindProperty("_tipKeys");
                string[] keys = { "LOADING_TIP_EXPLORE", "LOADING_TIP_SAVE", "LOADING_TIP_COMBAT" };
                tips.arraySize = keys.Length;
                for (int i = 0; i < keys.Length; i++) tips.GetArrayElementAtIndex(i).stringValue = keys[i];
                so.ApplyModifiedPropertiesWithoutUndo();
                report.Add($"{path}（默认标题/提示 key）");
            }
            return cfg;
        }

        // ── 默认本地化文案（中/英；已存在的 key 不覆盖）─────────────────────────
        private static void SeedLocalization(List<string> report)
        {
            var zh = new Dictionary<string, string>
            {
                { "LOADING_TITLE",        "加载中…" },
                { "LOADING_TIP_EXPLORE",  "多探索每个角落，常有隐藏的道路与收集物。" },
                { "LOADING_TIP_SAVE",     "在存档点休息可保存进度并恢复状态。" },
                { "LOADING_TIP_COMBAT",   "把握闪避与格挡的时机，是战斗的关键。" },
            };
            var en = new Dictionary<string, string>
            {
                { "LOADING_TITLE",        "Loading…" },
                { "LOADING_TIP_EXPLORE",  "Explore every corner — hidden paths and collectibles await." },
                { "LOADING_TIP_SAVE",     "Rest at save points to save progress and restore yourself." },
                { "LOADING_TIP_COMBAT",   "Timing your dodge and parry is the key to combat." },
            };
            int added = MergeWriteUI(Language.ChineseSimplified, zh) + MergeWriteUI(Language.English, en);
            report.Add($"本地化新增 {added} 条（已存在的不覆盖；可用「BaseGames/Localization/表格编辑器」补译）。");
        }

        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;
        }

        // ── 通用助手 ─────────────────────────────────────────────────────────
        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 AssignRef(Object target, string prop, Object value)
        {
            var so = new SerializedObject(target);
            var p  = so.FindProperty(prop);
            if (p == null) { Debug.LogWarning($"[UILoadingScreen] 未找到属性 {target.GetType().Name}.{prop}"); return; }
            p.objectReferenceValue = value;
            so.ApplyModifiedPropertiesWithoutUndo();
        }

        private static void AssignArray(Object target, string prop, Object[] values)
        {
            var so = new SerializedObject(target);
            var p  = so.FindProperty(prop);
            if (p == null || !p.isArray) return;
            p.arraySize = values.Length;
            for (int i = 0; i < values.Length; i++) p.GetArrayElementAtIndex(i).objectReferenceValue = values[i];
            so.ApplyModifiedPropertiesWithoutUndo();
        }

        private static T FindAsset<T>(string name) where T : Object
        {
            foreach (var guid in AssetDatabase.FindAssets($"{name} t:{typeof(T).Name}"))
            {
                var path  = AssetDatabase.GUIDToAssetPath(guid);
                var asset = AssetDatabase.LoadAssetAtPath<T>(path);
                if (asset != null && asset.name == name) return asset;
            }
            return null;
        }

        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;
            }
        }
    }
}