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

namespace NBF
{
    public class PreviewableAssetEditor : EditorWindow
    {
        private List<GameObject> previewablePrefabs = new List<GameObject>();
        private Vector2 scrollPosition;
        private int selectedIndex = -1;
        private GameObject selectedPrefab;
        private Editor prefabEditor;
        private SerializedObject serializedObject;

        [MenuItem("Tools/Previewable Asset Editor")]
        public static void ShowWindow()
        {
            GetWindow<PreviewableAssetEditor>("Previewable Assets");
        }

        private void OnEnable()
        {
            RefreshPrefabList();
        }

        private void RefreshPrefabList()
        {
            previewablePrefabs.Clear();

            // 查找项目中所有预制体
            string[] guids = AssetDatabase.FindAssets("t:Prefab");
            foreach (string guid in guids)
            {
                string path = AssetDatabase.GUIDToAssetPath(guid);
                GameObject prefab = AssetDatabase.LoadAssetAtPath<GameObject>(path);

                // 检查预制体是否有 PreviewableAsset 组件
                if (prefab.GetComponent<PreviewableAsset>() != null)
                {
                    previewablePrefabs.Add(prefab);
                }
            }

            // 按名称排序
            previewablePrefabs = previewablePrefabs.OrderBy(p => p.name).ToList();
        }

        private void OnGUI()
        {
            EditorGUILayout.BeginHorizontal();

            // 左侧列表
            DrawPrefabList();

            // 右侧操作区域
            DrawOperationArea();

            EditorGUILayout.EndHorizontal();
        }

        private void DrawPrefabList()
        {
            EditorGUILayout.BeginVertical(GUILayout.Width(250));

            EditorGUILayout.LabelField("Previewable Assets", EditorStyles.boldLabel);
            EditorGUILayout.Space();

            scrollPosition = EditorGUILayout.BeginScrollView(scrollPosition, "box");

            for (int i = 0; i < previewablePrefabs.Count; i++)
            {
                var prefab = previewablePrefabs[i];
                bool isSelected = i == selectedIndex;

                EditorGUILayout.BeginHorizontal();

                // 使用 toggle 样式按钮来模拟选择
                if (GUILayout.Toggle(isSelected, prefab.name, "Button", GUILayout.Height(20)))
                {
                    if (!isSelected)
                    {
                        selectedIndex = i;
                        selectedPrefab = prefab;
                        CreatePrefabEditor();
                    }
                }

                EditorGUILayout.EndHorizontal();
            }

            EditorGUILayout.EndScrollView();

            // 刷新按钮
            if (GUILayout.Button("Refresh List"))
            {
                RefreshPrefabList();
                selectedIndex = -1;
                selectedPrefab = null;
                prefabEditor = null;
            }

            EditorGUILayout.EndVertical();
        }

        private void DrawOperationArea()
        {
            EditorGUILayout.BeginVertical(GUILayout.ExpandWidth(true));

            if (selectedPrefab == null)
            {
                EditorGUILayout.HelpBox("Select a prefab from the list to edit its PreviewableAsset properties.",
                    MessageType.Info);
            }
            else
            {
                EditorGUILayout.LabelField("Editing: " + selectedPrefab.name, EditorStyles.boldLabel);
                EditorGUILayout.Space();

                // 显示预制体预览
                if (prefabEditor != null)
                {
                    prefabEditor.OnPreviewGUI(GUILayoutUtility.GetRect(100, 100), EditorStyles.helpBox);
                }

                EditorGUILayout.Space();

                // 显示 PreviewableAsset 属性
                var previewableAsset = selectedPrefab.GetComponent<PreviewableAsset>();
                if (previewableAsset != null)
                {
                    if (serializedObject == null || serializedObject.targetObject != previewableAsset)
                    {
                        serializedObject = new SerializedObject(previewableAsset);
                    }

                    serializedObject.Update();

                    // 自动绘制所有序列化字段
                    SerializedProperty prop = serializedObject.GetIterator();
                    bool enterChildren = true;
                    while (prop.NextVisible(enterChildren))
                    {
                        enterChildren = false;
                        if (prop.name == "m_Script") continue; // 跳过脚本引用
                        EditorGUILayout.PropertyField(prop, true);
                    }

                    serializedObject.ApplyModifiedProperties();

                    EditorGUILayout.Space();

                    // 保存按钮
                    if (GUILayout.Button("Save Changes", GUILayout.Height(30)))
                    {
                        SaveChanges();
                    }
                }
                else
                {
                    EditorGUILayout.HelpBox("Selected prefab no longer has a PreviewableAsset component.",
                        MessageType.Warning);
                }
            }

            EditorGUILayout.EndVertical();
        }

        private void CreatePrefabEditor()
        {
            if (prefabEditor != null)
            {
                DestroyImmediate(prefabEditor);
            }

            prefabEditor = Editor.CreateEditor(selectedPrefab);
        }

        private void SaveChanges()
        {
            if (selectedPrefab != null)
            {
                // 标记预制体为脏以便保存
                EditorUtility.SetDirty(selectedPrefab);

                // 保存预制体
                AssetDatabase.SaveAssets();
                AssetDatabase.Refresh();

                Debug.Log("Prefab " + selectedPrefab.name + " saved successfully.");
            }
        }

        private void OnDisable()
        {
            if (prefabEditor != null)
            {
                DestroyImmediate(prefabEditor);
            }
        }
    }
}