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

public class PrefabHelper
{
    [InitializeOnLoadMethod]
    static void StartInitializeOnLoadMethod()
    {
        PrefabUtility.prefabInstanceUpdated += OnPrefabInstanceUpdate;
    }
    static void OnPrefabInstanceUpdate(GameObject instance)
    {
        string path = UnityEditor.PrefabUtility.GetPrefabAssetPathOfNearestInstanceRoot(instance);

        var rootGO = PrefabUtility.LoadPrefabContents(path);

        var prefabLoaders = rootGO.GetComponentsInChildren<UIPrefabLoader>();
        var dirty = false;
        foreach (var loader in prefabLoaders)
        {
            if (!string.IsNullOrEmpty(loader.prefabName))
            {
                var children = new List<Transform>();
                for (int i = 0; i < loader.transform.childCount; i++)
                {
                    children.Add(loader.transform.GetChild(i));
                }
                for (int i = children.Count - 1; i >= 0; i--)
                {
                    if (children[i].name == loader.prefabName)
                    {
                        var childGo = children[i].gameObject;
                        GameObject.DestroyImmediate(childGo, true);
                        DebugEx.LogFormat("保存预制：{0}，删除了：{1}", path, loader.prefabName);
                        dirty = true;
                    }
                }
            }
        }
        if (dirty)
            PrefabUtility.SaveAsPrefabAsset(rootGO, path);
        PrefabUtility.UnloadPrefabContents(rootGO);
    }
}