using UnityEngine;
using UnityEditor;
using System;
using System.Linq;
using System.Collections.Generic;

[CustomEditor(typeof(SOEditorConfig))]
public class SOEditorConfigEditor : Editor
{
    private SerializedProperty _typeNamesProp;
    private string _searchText = "";

    private void OnEnable()
    {
        _typeNamesProp = serializedObject.FindProperty("targetTypeNames");
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();

        SOEditorConfig config = (SOEditorConfig)target;

        GUILayout.Label("已管理的 SO 类型:", EditorStyles.boldLabel);

        // === 1. 绘制已添加的类型列表 ===
        EditorGUILayout.BeginVertical("box");
        for (int i = 0; i < _typeNamesProp.arraySize; i++)
        {
            SerializedProperty prop = _typeNamesProp.GetArrayElementAtIndex(i);
            string typeName = prop.stringValue;

            EditorGUILayout.BeginHorizontal();
            {
                GUILayout.Label($"{i + 1}. {typeName}", EditorStyles.label);

                if (GUILayout.Button(EditorGUIUtility.IconContent("TreeEditor.Trash"), EditorStyles.iconButton, GUILayout.Width(25)))
                {
                    _typeNamesProp.DeleteArrayElementAtIndex(i);
                    break;
                }
            }
            EditorGUILayout.EndHorizontal();
        }

        if (_typeNamesProp.arraySize == 0)
        {
            GUILayout.Label("暂无类型，请添加", EditorStyles.centeredGreyMiniLabel);
        }

        EditorGUILayout.EndVertical();

        GUILayout.Space(10);

        // === 2. 拖拽区域 (核心修改) ===
        DrawDragDropArea();

        GUILayout.Space(10);

        // === 3. 搜索添加 ===
        GUILayout.Label("或者：搜索添加", EditorStyles.boldLabel);
        EditorGUILayout.BeginHorizontal();
        _searchText = EditorGUILayout.TextField(_searchText, EditorStyles.toolbarSearchField);
        if (GUILayout.Button("搜索", GUILayout.Width(60)))
        {
            ShowTypeSelectorMenu(config);
        }

        EditorGUILayout.EndHorizontal();

        serializedObject.ApplyModifiedProperties();
    }

    private void DrawDragDropArea()
    {
        // 绘制一个虚线框区域
        Rect dropArea = GUILayoutUtility.GetRect(0.0f, 60.0f, GUILayout.ExpandWidth(true));
        GUI.Box(dropArea, "\n拖拽文件到这里添加\n(支持 .cs 脚本 或 .asset 资源)", EditorStyles.helpBox);

        Event evt = Event.current;
        if (evt.type == EventType.DragUpdated || evt.type == EventType.DragPerform)
        {
            if (!dropArea.Contains(evt.mousePosition)) return;

            DragAndDrop.visualMode = DragAndDropVisualMode.Copy;

            if (evt.type == EventType.DragPerform)
            {
                DragAndDrop.AcceptDrag();

                foreach (UnityEngine.Object dragged_object in DragAndDrop.objectReferences)
                {
                    Type typeToAdd = null;

                    // 情况 A: 拖入的是 .cs 脚本文件
                    if (dragged_object is MonoScript script)
                    {
                        typeToAdd = script.GetClass();
                    }
                    // 情况 B: 拖入的是 .asset 资源实例 (比如 New Tank.asset)
                    else if (dragged_object is ScriptableObject soInstance)
                    {
                        // 直接获取这个实例的类型
                        typeToAdd = soInstance.GetType();
                    }

                    // 执行添加逻辑
                    if (typeToAdd != null)
                    {
                        // 过滤掉 Config 本身，防止把自己加进去
                        if (typeToAdd == typeof(SOEditorConfig)) continue;

                        if (typeToAdd.IsSubclassOf(typeof(ScriptableObject)))
                        {
                            AddType(typeToAdd.FullName);
                        }
                    }
                }
            }
        }
    }

    private void ShowTypeSelectorMenu(SOEditorConfig config)
    {
        GenericMenu menu = new GenericMenu();

        var allSoTypes = TypeCache.GetTypesDerivedFrom<ScriptableObject>()
            .Where(t => !t.IsAbstract && !t.IsGenericType && !t.Namespace.StartsWith("Unity") && !t.Namespace.StartsWith("UnityEditor"))
            .OrderBy(t => t.Name);

        foreach (var type in allSoTypes)
        {
            if (!string.IsNullOrEmpty(_searchText) && !type.Name.ToLower().Contains(_searchText.ToLower()))
                continue;

            string menuPath = string.IsNullOrEmpty(type.Namespace) ? type.Name : $"{type.Namespace}/{type.Name}";

            menu.AddItem(new GUIContent(menuPath), config.targetTypeNames.Contains(type.FullName), () => { AddType(type.FullName); });
        }

        menu.ShowAsContext();
    }

    private void AddType(string typeFullName)
    {
        serializedObject.Update();
        bool exists = false;
        for (int i = 0; i < _typeNamesProp.arraySize; i++)
        {
            if (_typeNamesProp.GetArrayElementAtIndex(i).stringValue == typeFullName)
            {
                exists = true;
                break;
            }
        }

        if (!exists)
        {
            _typeNamesProp.InsertArrayElementAtIndex(_typeNamesProp.arraySize);
            _typeNamesProp.GetArrayElementAtIndex(_typeNamesProp.arraySize - 1).stringValue = typeFullName;
            serializedObject.ApplyModifiedProperties();
        }
    }
}