using UnityEditor;
using UnityEngine;
using UnityEngine.UI;
using TMPro;
using BaseGames.UI;
using BaseGames.UI.Theme;

namespace BaseGames.Editor.UI
{
    /// <summary>
    /// 输入提示控件脚手架：生成 / 放置 <c>UI_Control_InputPrompt</c> 预制件
    /// —— 一个「按键图标 + 文字」的可复用提示（如菜单底部「Ⓐ 确定」「Ⓑ 返回」）。
    ///
    /// <para>图标走已有的设备适配链路（零代码）：</para>
    /// 控件内 <see cref="InputIconImage"/> 据 ActionName 经 <c>IInputIconService</c> 解析
    /// <b>当前设备</b>（键鼠/PS/Xbox/Switch）+ 改键后的实际绑定 → 自动显示正确按键图标，
    /// 设备切换/改键时自动刷新。<b>前提：美术把按键 sprite 填入 ICN_Keyboard/Xbox/PlayStation/Switch 资产。</b>
    ///
    /// <para>策划/美术用法：</para>
    /// 菜单「向选中节点放置 ▸ InputPrompt」放进任意 Canvas，
    /// 在 Icon 的 InputIconImage 填 ActionName（如 Interact/Jump），Label 填提示文字（可挂 LocalizedText）。
    ///
    /// 菜单：BaseGames/UI/控件库/...
    /// </summary>
    public static class UIInputPromptScaffold
    {
        private const string ControlsDir = "Assets/_Game/Prefabs/UI/Controls";
        private const string ThemePath   = "Assets/_Game/Data/UI/Themes/UI_Theme_Default.asset";
        private const string PfPrompt    = "UI_Control_InputPrompt";

        [MenuItem("BaseGames/UI/控件库/生成输入提示控件（UI_Control_InputPrompt）")]
        public static void GeneratePrompt()
        {
            EnsureFolder(ControlsDir);
            BuildPrompt();
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            Debug.Log($"[UIInputPrompt] 已生成 {ControlsDir}/{PfPrompt}.prefab。\n" +
                      "用法：菜单「向选中节点放置 ▸ InputPrompt」放进 UI，Icon 填 ActionName、Label 填文字。\n" +
                      "图标随当前设备自动切换；需美术把按键 sprite 填入 ICN_Keyboard/Xbox/PlayStation/Switch 资产。");
        }

        [MenuItem("BaseGames/UI/控件库/向选中节点放置 ▸ InputPrompt")]
        private static void PlacePrompt()
        {
            string path = $"{ControlsDir}/{PfPrompt}.prefab";
            var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(path);
            if (prefab == null)
            {
                EditorUtility.DisplayDialog("控件库",
                    $"未找到预制件：{path}\n请先执行「生成输入提示控件（UI_Control_InputPrompt）」。", "确定");
                return;
            }

            Transform parent = Selection.activeTransform;
            if (parent == null)
            {
                var canvas = Object.FindObjectOfType<Canvas>();
                parent = canvas != null ? canvas.transform : null;
            }

            var instance = (GameObject)PrefabUtility.InstantiatePrefab(prefab, parent);
            if (instance == null) return;
            Undo.RegisterCreatedObjectUndo(instance, $"Place {PfPrompt}");
            Selection.activeGameObject = instance;
            EditorGUIUtility.PingObject(instance);
        }

        // ── 构建 ─────────────────────────────────────────────────────────────
        private static void BuildPrompt()
        {
            var theme = AssetDatabase.LoadAssetAtPath<UIThemeSO>(ThemePath);

            // 根：横向布局（图标 + 文字），自适应内容宽度
            var root = NewUI(PfPrompt, 120f, 44f);
            var h = root.AddComponent<HorizontalLayoutGroup>();
            h.spacing = 8f; h.childAlignment = TextAnchor.MiddleLeft;
            h.childForceExpandWidth = false; h.childForceExpandHeight = false;
            h.childControlWidth = true; h.childControlHeight = true;
            var fitter = root.AddComponent<ContentSizeFitter>();
            fitter.horizontalFit = ContentSizeFitter.FitMode.PreferredSize;
            fitter.verticalFit   = ContentSizeFitter.FitMode.PreferredSize;

            // 图标：Image + InputIconImage（同物体，InputIconImage 要求 Image）
            var iconGo = NewUIChild(root.transform, "Icon", out _);
            var iconImg = iconGo.AddComponent<Image>();
            iconImg.preserveAspect = true;
            iconImg.sprite = Knob();   // 编辑期占位图；运行时由 InputIconImage 替换为当前设备按键图（无图则自动隐藏）
            var iconLe = iconGo.AddComponent<LayoutElement>();
            iconLe.preferredWidth = 40f; iconLe.preferredHeight = 40f;
            iconLe.minWidth = 32f; iconLe.minHeight = 32f;
            var iconComp = iconGo.AddComponent<InputIconImage>();
            SetEnum(iconComp, "_mode", (int)InputIconImage.LookupMode.ByActionName);
            SetString(iconComp, "_actionName", "Interact");   // 占位 ActionName，策划按需改

            // 文字：提示标签（可挂 LocalizedText；默认占位）
            var lblGo = NewUIChild(root.transform, "Label", out _);
            var lbl = lblGo.AddComponent<TextMeshProUGUI>();
            lbl.text = "提示"; lbl.fontSize = 24f; lbl.alignment = TextAlignmentOptions.MidlineLeft;
            lbl.color = new Color(0.80f, 0.80f, 0.82f, 1f);
            lbl.raycastTarget = false;
            var lblLe = lblGo.AddComponent<LayoutElement>();
            lblLe.preferredHeight = 40f;
            SetEnum(lblGo.AddComponent<UIThemeRole>(), "_kind", (int)UIThemeRoleKind.Text_Secondary);

            _ = theme; // 配色随就近父级 UIThemeApplier；本控件不自带 applier，避免嵌套重复应用

            string path = $"{ControlsDir}/{PfPrompt}.prefab";
            PrefabUtility.SaveAsPrefabAsset(root, path);
            Object.DestroyImmediate(root);
        }

        // ── 助手 ─────────────────────────────────────────────────────────────
        private static GameObject NewUI(string name, float w, float h)
        {
            var go = new GameObject(name, typeof(RectTransform));
            ((RectTransform)go.transform).sizeDelta = new Vector2(w, h);
            return go;
        }

        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 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)
        {
            var so = new SerializedObject(c);
            var p  = so.FindProperty(prop);
            if (p != null) { p.stringValue = value; so.ApplyModifiedPropertiesWithoutUndo(); }
        }

        private static Sprite Knob() => AssetDatabase.GetBuiltinExtraResource<Sprite>("UI/Skin/Knob.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;
            }
        }
    }
}