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

public static class TreeUtil
{
    private const string TREE_OPAQUE_SHADER = "Assets/Code/Shaders/Scene/NLD_Scene_Opaque.shader";

    [MenuItem("Assets/*Custom/资源处理/处理树资源")]
    private static void PostProcessTree()
    {
        var selectedObj = Selection.activeGameObject;
        if (selectedObj != null && EditorUtility.IsPersistent(selectedObj))
        {
            PostProcessTree(selectedObj);
        }
    }

    //树是从Tree Creator生成的，目前Unity已经不支持了，需要将其中无用的资源删除并且新建材质
    public static void PostProcessTree(GameObject tree)
    {
        if (tree.GetComponent<Tree>() == null)
        {
            Debug.LogError($"当前对象上没有Tree组件，请确认{tree.name}是树！");
            EditorGUIUtility.PingObject(tree);
            return;
        }

        CreateOpaqueMaterial(tree);
        RemoveUnUseComponent(tree);
        RemoveTreeUselessSubAsset(tree);
        EditorUtility.SetDirty(tree);
        AssetDatabase.Refresh();
        Debug.Log("处理成功!");
    }

    //为树创建不透明材质
    private static void CreateOpaqueMaterial(GameObject tree)
    {
        var opaqueShader = AssetDatabase.LoadAssetAtPath<Shader>(TREE_OPAQUE_SHADER);
        if (opaqueShader == null)
        {
            Debug.LogError($"找不到shader:{TREE_OPAQUE_SHADER}");
            return;
        }

        var mats = MaterialUtil.ReplaceMaterialOnGameObject(tree, opaqueShader);
        mats[0].name = "tree_branch";
        mats[1].name = "tree_leaves";
        mats[0].enableInstancing = true;
        mats[1].enableInstancing = true;
        AssetDatabase.AddObjectToAsset(mats[0],tree);
        AssetDatabase.AddObjectToAsset(mats[1],tree);
    }

    //移除tree组件
    private static void RemoveUnUseComponent(GameObject tree)
    {
        var treeComponent = tree.GetComponent<Tree>();
        Object.DestroyImmediate(treeComponent, true);
    }

    //删除无用资源
    private static void RemoveTreeUselessSubAsset(GameObject tree)
    {
        var assetPath = AssetDatabase.GetAssetPath(tree);
        if (string.IsNullOrEmpty(assetPath))
            return;
        var allAssets = AssetDatabase.LoadAllAssetsAtPath(assetPath);
        for (int i = allAssets.Length - 1; i >= 0; i--)
        {
            var asset = allAssets[i];
            var assetName = asset.name.ToLower();
            if (AssetDatabase.IsSubAsset(asset) && (assetName.Contains("optimized") || assetName.Contains("tree data")))
            {
                AssetDatabase.RemoveObjectFromAsset(asset);
            }
        }
    }
}