using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;
using UnityEngine.SceneManagement;

public static class MoveMusicPicToPrefab
{
    const string ScenePath = "Assets/Scenes/UI_UI.unity";
    const string PrefabPath = "Assets/Scripts/UI/Panel/dontdestroyonload/btm and top.prefab";
    const string MusicPicName = "MusicPic";

    [MenuItem("Tools/MusicPic/Move To btm and top Prefab")]
    public static void Execute()
    {
        var scene = EditorSceneManager.OpenScene(ScenePath, OpenSceneMode.Single);
        if (!scene.IsValid())
        {
            Debug.LogError("[MoveMusicPicToPrefab] Failed to open UI_UI scene.");
            return;
        }

        var musicPic = FindInScene(scene, MusicPicName);
        if (musicPic == null)
        {
            Debug.LogError("[MoveMusicPicToPrefab] MusicPic not found in UI_UI scene.");
            return;
        }

        var prefabRoot = PrefabUtility.LoadPrefabContents(PrefabPath);
        if (prefabRoot == null)
        {
            Debug.LogError("[MoveMusicPicToPrefab] Failed to load prefab.");
            return;
        }

        var existing = prefabRoot.transform.Find(MusicPicName);
        if (existing != null)
        {
            Object.DestroyImmediate(existing.gameObject);
        }

        var copy = Object.Instantiate(musicPic);
        copy.name = MusicPicName;
        copy.transform.SetParent(prefabRoot.transform, false);
        copy.transform.localPosition = Vector3.zero;
        copy.transform.localRotation = Quaternion.identity;
        copy.transform.localScale = Vector3.one;

        PrefabUtility.SaveAsPrefabAsset(prefabRoot, PrefabPath);
        PrefabUtility.UnloadPrefabContents(prefabRoot);

        Object.DestroyImmediate(musicPic);
        EditorSceneManager.MarkSceneDirty(scene);
        EditorSceneManager.SaveScene(scene);

        Debug.Log("[MoveMusicPicToPrefab] Moved MusicPic into btm and top prefab and removed from UI_UI scene.");
    }

    static GameObject FindInScene(Scene scene, string name)
    {
        var roots = scene.GetRootGameObjects();
        foreach (var root in roots)
        {
            if (root == null) continue;
            var t = root.transform.Find(name);
            if (t != null) return t.gameObject;
        }
        var all = Object.FindObjectsByType<Transform>(FindObjectsInactive.Include, FindObjectsSortMode.None);
        foreach (var t in all)
        {
            if (t == null) continue;
            if (t.gameObject.scene != scene) continue;
            if (t.name == name) return t.gameObject;
        }
        return null;
    }
}