//------------------------------------------------------------
// Game Framework
// Copyright © 2013-2020 Jiang Yin. All rights reserved.
// Homepage: https://gameframework.cn/
// Feedback: mailto:ellan@gameframework.cn
//------------------------------------------------------------

using System;
using System.IO;

namespace ET
{
    public static partial class Utility
    {
        /// <summary>
        /// 路径相关的实用函数。
        /// </summary>
        public static class Path
        {
            public static string DataPathToAssetPath(string path)
            {
                if (path.Contains("\\"))
                    return path.Substring(path.IndexOf("Assets\\"));
                else
                    return path.Substring(path.IndexOf("Assets/"));
            }
            /// <summary>
            /// 获取规范的路径。
            /// </summary>
            /// <param name="path">要规范的路径。</param>
            /// <returns>规范的路径。</returns>
            public static string GetRegularPath(string path)
            {
                if (path == null)
                {
                    return null;
                }

                return path.Replace('\\', '/');
            }

            /// <summary>
            /// 获取远程格式的路径（带有file:// 或 http:// 前缀）。
            /// </summary>
            /// <param name="path">原始路径。</param>
            /// <returns>远程格式路径。</returns>
            public static string GetRemotePath(string path)
            {
                string regularPath = GetRegularPath(path);
                if (regularPath == null)
                {
                    return null;
                }

                return regularPath.Contains("://") ? regularPath : ("file:///" + regularPath).Replace("file:////", "file:///");
            }

            /// <summary>
            /// 获取带有后缀的资源名。
            /// </summary>
            /// <param name="resourceName">原始资源名。</param>
            /// <returns>带有后缀的资源名。</returns>
            public static string GetResourceNameWithSuffix(string resourceName)
            {
                if (string.IsNullOrEmpty(resourceName))
                {
                    throw new Exception("Resource name is invalid.");
                }

                return Text.Format("{0}.dat", resourceName);
            }

            /// <summary>
            /// 获取带有 CRC32 和后缀的资源名。
            /// </summary>
            /// <param name="resourceName">原始资源名。</param>
            /// <param name="hashCode">CRC32 哈希值。</param>
            /// <returns>带有 CRC32 和后缀的资源名。</returns>
            public static string GetResourceNameWithCrc32AndSuffix(string resourceName, int hashCode)
            {
                if (string.IsNullOrEmpty(resourceName))
                {
                    throw new Exception("Resource name is invalid.");
                }

                return Text.Format("{0}.{1:x8}.dat", resourceName, hashCode);
            }

            /// <summary>
            /// 移除空文件夹。
            /// </summary>
            /// <param name="directoryName">要处理的文件夹名称。</param>
            /// <returns>是否移除空文件夹成功。</returns>
            public static bool RemoveEmptyDirectory(string directoryName)
            {
                if (string.IsNullOrEmpty(directoryName))
                {
                    throw new Exception("Directory name is invalid.");
                }

                try
                {
                    if (!Directory.Exists(directoryName))
                    {
                        return false;
                    }

                    // 不使用 SearchOption.AllDirectories，以便于在可能产生异常的环境下删除尽可能多的目录
                    string[] subDirectoryNames = Directory.GetDirectories(directoryName, "*");
                    int subDirectoryCount = subDirectoryNames.Length;
                    foreach (string subDirectoryName in subDirectoryNames)
                    {
                        if (RemoveEmptyDirectory(subDirectoryName))
                        {
                            subDirectoryCount--;
                        }
                    }

                    if (subDirectoryCount > 0)
                    {
                        return false;
                    }

                    if (Directory.GetFiles(directoryName, "*").Length > 0)
                    {
                        return false;
                    }

                    Directory.Delete(directoryName);
                    return true;
                }
                catch
                {
                    return false;
                }
            }
        }
    }
}