namespace SharpCompressStudy.Core
{
    /// <summary>
    /// 因为：Rar压缩算法是私有的，而解压文件算法是公开的。
    /// 所以：不能创建Rar压缩文件，但能解压现有Rar文件。
    /// 能解压和创建zip、tar、7z等压缩格式的文件
    /// </summary>
    public class WinRarFileTest:IDisposable
    {
        private readonly ITestOutputHelper testOutput;
        public WinRarFileTest(ITestOutputHelper testOutputHelper) 
        {
            this.testOutput = testOutputHelper;
        }

        /// <summary>
        /// 解压Rar文件
        /// 注意：不能创建Rar压缩文件
        /// </summary>
        [Fact]
        public void ExtractFromRar_Test()
        {

            var rarFilePath = AppDomain.CurrentDomain.BaseDirectory + "Resource\\学习2.rar";

            if (!File.Exists(rarFilePath))
            {
                throw new FileNotFoundException("Rar文件不存在");
            }

            //扩展名
            var extName = Path.GetExtension(rarFilePath);

            //文件名
            var rarFileName = Path.GetFileName(rarFilePath).Replace(extName, "");

            //不带扩展名的文件名
            var rarFileNameWithoutExt = Path.GetFileNameWithoutExtension(rarFilePath);

            //解压根目录
            var extractPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Resource\\models\\temp\\", Guid.NewGuid().ToString() + "\\");

            using (var archive = RarArchive.Open(rarFilePath))
            {
                //压缩文件是否包含同名根目录(abc.rar解决后是否有一个名为abc的根目录)
                if (archive.Entries.Where(f => f.IsDirectory && f.Key == rarFileNameWithoutExt).Count() != 1)
                {
                    extractPath = Path.Combine(extractPath, rarFileNameWithoutExt);
                }

                //创建解压目录
                if (!Directory.Exists(extractPath))
                {
                    Directory.CreateDirectory(extractPath);
                }

                //解压所有文件到指定目录
                foreach (var entry in archive.Entries)
                {
                    if (!entry.IsDirectory)
                    {
                        entry.WriteToDirectory(extractPath, new ExtractionOptions { ExtractFullPath = true, Overwrite = true });
                    }
                }
            }

            testOutput.WriteLine($"文件解压到目录：{extractPath}");
        }

        [Fact]
        public void CompressToZip_Test()
        {
            string filesPath = AppDomain.CurrentDomain.BaseDirectory + "Resource\\学习";
            var extractPathFolder = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Resource\\", Guid.NewGuid().ToString() + "\\");
            var extractPathFile = Path.Combine(extractPathFolder, "学习.zip");
            if (!Directory.Exists(extractPathFolder))
            {
                Directory.CreateDirectory(extractPathFolder);
            }

            using var zip = File.OpenWrite(extractPathFile);
            using var zipWriter = WriterFactory.Open(zip, ArchiveType.Zip, CompressionType.Deflate);
            zipWriter.WriteAll(filesPath, "*", SearchOption.AllDirectories);
        }

        public void Dispose()
        {
            GC.SuppressFinalize(this);
        }
    }
}