using System;
using System.IO;
using System.Text.RegularExpressions;
using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

namespace BaseGames.Editor.Shared
{
    /// <summary>
    /// 资产快速创建向导 —— 弹出式 EditorWindow，引导输入 ID 并预览文件名，
    /// 一键创建 ScriptableObject 到指定文件夹。
    /// 用法: AssetCreationWizard.Show&lt;QuestSO&gt;(folder, prefix, (asset, id) => { asset.questId = id; });
    /// </summary>
    public class AssetCreationWizard : EditorWindow
    {
        private string                           _folder;
        private string                           _prefix;
        private string                           _idInput    = "";
        private string                           _typeName;
        private Type                             _assetType;
        private Action<ScriptableObject, string> _onCreated;

        private TextField _idField;
        private Label     _previewLabel;

        // ── 公开入口 ─────────────────────────────────────────────────────────

        /// <summary>
        /// 打开向导。资产创建完成后以 (asset, id) 形式回调，调用方可在回调中自行设置 ID 字段。
        /// </summary>
        public static void Show<T>(string folder, string prefix, Action<T, string> onCreated)
            where T : ScriptableObject
        {
            string displayName = typeof(T).Name.EndsWith("SO")
                ? typeof(T).Name[..^2]
                : typeof(T).Name;

            var win = CreateInstance<AssetCreationWizard>();
            win.titleContent = new GUIContent($"新建 {displayName}");
            win._folder      = folder;
            win._prefix      = prefix;
            win._assetType   = typeof(T);
            win._typeName    = displayName;
            win._onCreated   = (so, id) => onCreated((T)so, id);
            win.minSize      = new Vector2(320, 132);
            win.maxSize      = new Vector2(480, 132);
            win.ShowUtility();
        }

        // ── UI 构建 ──────────────────────────────────────────────────────────

        private void CreateGUI()
        {
            var root = rootVisualElement;
            root.style.paddingTop    = 12;
            root.style.paddingBottom = 12;
            root.style.paddingLeft   = 16;
            root.style.paddingRight  = 16;

            // 说明行
            var desc = new Label($"将在 {_folder} 中新建一个 {_typeName}");
            desc.style.fontSize     = 10;
            desc.style.opacity      = 0.55f;
            desc.style.marginBottom = 10;
            root.Add(desc);

            // ID 输入行
            var row = new VisualElement();
            row.style.flexDirection = FlexDirection.Row;
            row.style.alignItems    = Align.Center;
            row.style.marginBottom  = 6;

            var idLabel = new Label("ID：");
            idLabel.style.width          = 36;
            idLabel.style.unityTextAlign = TextAnchor.MiddleLeft;
            idLabel.style.flexShrink     = 0;
            row.Add(idLabel);

            _idField = new TextField { value = "" };
            _idField.style.flexGrow = 1;
            _idField.RegisterValueChangedCallback(evt =>
            {
                _idInput = evt.newValue;
                RefreshPreview();
            });
            row.Add(_idField);
            root.Add(row);

            // 文件名预览
            _previewLabel = new Label("文件名：（请输入 ID）");
            _previewLabel.style.fontSize     = 10;
            _previewLabel.style.opacity      = 0.5f;
            _previewLabel.style.marginBottom = 12;
            root.Add(_previewLabel);

            // 按钮行
            var btnRow = new VisualElement();
            btnRow.style.flexDirection  = FlexDirection.Row;
            btnRow.style.justifyContent = Justify.FlexEnd;

            var cancelBtn = new Button(Close) { text = "取消" };
            cancelBtn.style.width       = 56;
            cancelBtn.style.marginRight = 6;
            btnRow.Add(cancelBtn);

            var createBtn = new Button(DoCreate) { text = "创建" };
            createBtn.style.width = 56;
            btnRow.Add(createBtn);

            root.Add(btnRow);

            // 自动聚焦 ID 输入框
            _idField.schedule.Execute(() => _idField.Focus()).StartingIn(50);
        }

        // ── 私有逻辑 ─────────────────────────────────────────────────────────

        private void RefreshPreview()
        {
            if (_previewLabel == null) return;
            _previewLabel.text = string.IsNullOrWhiteSpace(_idInput)
                ? "文件名：（请输入 ID）"
                : $"文件名：{_prefix}{_idInput}.asset";
        }

        private void DoCreate()
        {
            if (string.IsNullOrWhiteSpace(_idInput))
            {
                EditorUtility.DisplayDialog("ID 不能为空", "请输入有效的 ID 后再创建。", "确定");
                return;
            }

            if (!Regex.IsMatch(_idInput, @"^[\w\-]+$"))
            {
                EditorUtility.DisplayDialog("ID 格式有误", "ID 只能包含字母、数字、下划线或连字符。", "确定");
                return;
            }

            if (!Directory.Exists(_folder))
                Directory.CreateDirectory(_folder);

            string path = $"{_folder}/{_prefix}{_idInput}.asset";
            if (File.Exists(path))
            {
                EditorUtility.DisplayDialog("文件已存在", $"路径已存在：\n{path}\n请更换 ID。", "确定");
                return;
            }

            var asset = CreateInstance(_assetType) as ScriptableObject;
            AssetDatabase.CreateAsset(asset, path);
            Undo.RegisterCreatedObjectUndo(asset, $"创建 {_typeName} {_idInput}");
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();

            _onCreated?.Invoke(asset, _idInput);
            Close();
        }
    }
}