//要继承EditorWindow才能显示自己的框框
using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEngine;

public class FindMissingWindow : EditorWindow
{
#if UNITY_EDITOR
    [MenuItem("项目工具/资源检查/检查丢失引用的Animator资源")]
    public static void FindMissing()
    {
        GetWindow<FindMissingWindow>().titleContent = new GUIContent("查找Missing资源");
        GetWindow<FindMissingWindow>().Show();
        Find();
    }
    private static Dictionary<UnityEngine.Object, List<UnityEngine.Object>> prefabs = new Dictionary<UnityEngine.Object, List<UnityEngine.Object>>();
    private static Dictionary<UnityEngine.Object, string> refPaths = new Dictionary<UnityEngine.Object, string>();
    private static void Find()
    {
        prefabs.Clear();
        string[] allassetpaths = AssetDatabase.GetAllAssetPaths();//获取所有资源路径
        var gos = allassetpaths
            .Where(a => a.EndsWith("prefab"))//筛选 是以prefab为后缀的 预设体资源
            .Select(a => AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(a));//加载这个预设体
                                                                               //gos拿到的是所有加载好的预设体
        foreach (var item in gos)
        {
            GameObject go = item as GameObject;
            if (go)
            {
                Component[] cps = go.GetComponentsInChildren<Component>(true);//获取这个物体身上所有的组件
                foreach (var cp in cps)//遍历每一个组件
                {
                    if (!cp)
                    {
                        if (!prefabs.ContainsKey(go))
                        {
                            prefabs.Add(go, new List<UnityEngine.Object>() { cp });
                        }
                        else
                        {
                            prefabs[go].Add(cp);
                        }
                        continue;
                    }
                    SerializedObject so = new SerializedObject(cp);//生成一个组件对应的S俄日阿里则对Object对象 用于遍历这个组件的所有属性
                    var iter = so.GetIterator();//拿到迭代器
                    while (iter.NextVisible(true))//如果有下一个属性
                    {
                        //如果这个属性类型是引用类型的
                        if (iter.propertyType == SerializedPropertyType.ObjectReference)
                            {
                            //引用对象是null 并且 引用ID不是0 说明丢失了引用
                            if (iter.objectReferenceValue == null && iter.objectReferenceInstanceIDValue != 0)
                            {
                                if (!refPaths.ContainsKey(cp)) refPaths.Add(cp, iter.propertyPath);
                                else refPaths[cp] += " | " + iter.propertyPath;
                                if (prefabs.ContainsKey(go))
                                {
                                    if (!prefabs[go].Contains(cp)) prefabs[go].Add(cp);
                                }
                                else
                                {
                                    prefabs.Add(go, new List<UnityEngine.Object>() { cp });
                                }
                            }
                        }
                    }
                }
            }
        }
        EditorUtility.DisplayDialog("", "就绪", "OK");
    }
    //以下只是将查找结果显示
    private Vector3 scroll = Vector3.zero;
    private void OnGUI()
    {
        scroll = EditorGUILayout.BeginScrollView(scroll);
        EditorGUILayout.BeginVertical();
        if (GUILayout.Button("移除丢失引用的Animator组件")) RemoveAnimatorWithMissReference();
        foreach (var item in prefabs)
        {
            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.ObjectField(item.Key, typeof(GameObject), true, GUILayout.Width(200));
            EditorGUILayout.BeginVertical();
            foreach (var cp in item.Value)
            {
                if (cp)
                {
                    EditorGUILayout.BeginHorizontal();
                    EditorGUILayout.ObjectField(cp, cp.GetType(), true, GUILayout.Width(200));
                    if (refPaths.ContainsKey(cp))
                    {
                        GUILayout.Label(refPaths[cp]);
                    }
                    EditorGUILayout.EndHorizontal();
                }
            }
            EditorGUILayout.EndVertical();
            EditorGUILayout.EndHorizontal();
        }
        EditorGUILayout.EndVertical();
        EditorGUILayout.EndScrollView();
    }

    private void RemoveAnimatorWithMissReference()
    {
        int count = 0;
        foreach (var cps in prefabs.Values)
        {
            foreach (var item in cps)
            {
                Animator a = item as Animator;
                if (a)
                {
                    count++;
                    EditorUtility.SetDirty(a.gameObject);
                    DestroyImmediate(a, true);
                }
            }
        }
        if (count > 0)
        {
            EditorUtility.DisplayDialog("", "一共移除" + count + "个Animator组件", "OK");
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            Find();
        }
    }
#endif
}