using System;
using System.IO;
using UnityEditor;
using Random = UnityEngine.Random;

public class GameBuildHelper
{
    private const string BuildSceneTemplate = "Assets/Scenes/BuildTemplate.unity";

    [MenuItem("Assets/创建建造场景")]
    private static void CreateLevel()
    {
        var currDir = GetCurrentAssetDirectory().Replace("\\", "/");
        var dirName = Path.GetFileName(currDir);
        var count = AssetDatabase.FindAssets("t:SceneAsset", new[] { currDir }).Length + 1;
        var savePath = GetAssetUniquePath($"{currDir}/{dirName}_{count}.unity", out var assetName);
        AssetDatabase.CopyAsset(BuildSceneTemplate, savePath);
        var newScene = AssetDatabase.LoadAssetAtPath<SceneAsset>(savePath);
        EditorGUIUtility.PingObject(newScene);
    }

    private static string GetCurrentAssetDirectory()
    {
        foreach (UnityEngine.Object obj in Selection.GetFiltered<Object>(SelectionMode.Assets))
        {
            var path = AssetDatabase.GetAssetPath(obj);
            if (string.IsNullOrEmpty(path))
                continue;

            if (System.IO.Directory.Exists(path))
                return path;
            else if (System.IO.File.Exists(path))
                return System.IO.Path.GetDirectoryName(path);
        }

        return "Assets";
    }

    /// <summary>
    /// 获取一个唯一的路径用于保存asset，假设传入的路径已经存在，则自动生成一个新的
    /// </summary>
    /// <param name="assetPath">尝试保存的路径</param>
    /// <returns>第一个string是唯一路径，第二个string是asset的新名字</returns>
    private static string GetAssetUniquePath(string assetPath, out string assetName)
    {
        assetName = Path.GetFileNameWithoutExtension(assetPath);
        var extension = Path.GetExtension(assetPath);
        var dir = Path.GetDirectoryName(assetPath);
        var savedAsset = AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(assetPath);
        if (savedAsset == null)
        {
            return assetPath;
        }

        assetName = $"{assetName}_{Random.Range(0, 10000)}";
        var newAssetPath = $"{dir}/{assetName}{extension}";
        return GetAssetUniquePath(newAssetPath, out assetName);
    }
}