using SharpCompress.Archives;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Linq;
using SharpCompress.Readers;
using SharpCompress.Writers;
using SharpCompress.Common;

namespace AutoPekage
{
    class ZipControl
    {

        

        public delegate void NewFileDecompressHandle(string filePath);

        public static event NewFileDecompressHandle NewFileDecompress;

        public delegate bool FileWillDecompressHandle(string filePath);

        public static event FileWillDecompressHandle FileWillDecompress;
        /// <summary>
        /// ZIP:解压一个zip文件
        /// add yuangang by 2016-06-13
        /// </summary>
        /// <param name="ZipFile">需要解压的Zip文件（绝对路径）</param>
        /// <param name="Password">解压密码</param>
        /// <param name="OverWrite">是否覆盖已存在的文件</param>
        public static void UnZip(string ZipFile,  string Password, bool OverWrite = true)
        {
            //如果解压到的目录不存在，则报错
            //if (!System.IO.Directory.Exists(Form1.tempPath))
            //{
            //    Directory.CreateDirectory(Form1.tempPath);
            //}

            //using (ZipInputStream zipfiles = new ZipInputStream(File.OpenRead(ZipFile)))
            //{
            //    zipfiles.Password = Password;
            //    ZipEntry theEntry;

            //    while ((theEntry = zipfiles.GetNextEntry()) != null)
            //    {
            //        string pathToZip = "";
            //        pathToZip = theEntry.Name;

            //        string fileName = Path.GetFileName(pathToZip);

            //        if (fileName != "")
            //        {
            //            string filePath = Path.Combine(Form1.tempPath, fileName);
            //            if ((File.Exists(Form1.tempPath + fileName) && OverWrite) || (!File.Exists(filePath)))
            //            {
            //                using (FileStream streamWriter = File.Create(filePath))
            //                {
            //                    int size = 2048;
            //                    byte[] data = new byte[2048];
            //                    while (true)
            //                    {
            //                        size = zipfiles.Read(data, 0, data.Length);

            //                        if (size > 0)
            //                            streamWriter.Write(data, 0, size);
            //                        else
            //                            break;
            //                    }
            //                    streamWriter.Close();
            //                }
            //                if (NewFileDecompress != null)
            //                {
            //                    NewFileDecompress(filePath);
            //                }
            //            }
            //        }
            //    }

            //    zipfiles.Close();
            //}
        }

        /// <summary>
        /// 压缩文件
        /// </summary>
        /// <param name="zipPath">压缩文件路径</param>
        /// <param name="fileList">文件列表</param>
        public static void Zip(string zipPath, List<string> fileList)
        {
            //ZipOutputStream zipStream = null;
            //FileStream streamWriter = null;
            //try
            //{
            //    //Use Crc32
            //    Crc32 crc32 = new Crc32();

            //    //Create Zip File
            //    zipStream = new ZipOutputStream(File.Create(zipPath));

            //    //Specify Level
            //    zipStream.SetLevel(9);

            //    //Foreach File
            //    foreach (string file in fileList)
            //    {
            //        //Check Whether the file exists
            //        if (!File.Exists(file))
            //        {
            //            throw new FileNotFoundException(file);
            //        }

            //        //Read the file to stream
            //        streamWriter = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            //        byte[] buffer = new byte[streamWriter.Length];
            //        streamWriter.Read(buffer, 0, buffer.Length);
            //        streamWriter.Close();

            //        //Specify ZipEntry
            //        crc32.Reset();
            //        crc32.Update(buffer);
            //        ZipEntry zipEntry = new ZipEntry(Path.GetFileName(file));
            //        zipEntry.DateTime = DateTime.Now;
            //        zipEntry.Size = buffer.Length;
            //        zipEntry.Crc = crc32.Value;

            //        //Put file info into zip stream
            //        zipStream.PutNextEntry(zipEntry);

            //        //Put file data into zip stream
            //        zipStream.Write(buffer, 0, buffer.Length);
            //    }
            //}
            //catch
            //{
            //    throw;
            //}
            //finally
            //{
            //    //Clear Resource
            //    if (streamWriter != null)
            //    {
            //        streamWriter.Close();
            //    }
            //    if (zipStream != null)
            //    {
            //        zipStream.Finish();
            //        zipStream.Close();
            //    }
            //}

            using (Stream stream = File.OpenWrite(zipPath))
            {
                using (var writer = WriterFactory.Open(stream, ArchiveType.Zip, new WriterOptions(CompressionType.Deflate)
                {
                    LeaveStreamOpen = true
                }))
                {
                    foreach (var file in fileList)
                    {
                        writer.Write(Path.GetFileName(file), file);
                    }
                }
                if (!stream.CanWrite)
                {
                    throw new InvalidOperationException();
                }
            }
        }

        public static void UnCompress(string ZipFile, string unCompressPath, bool OverWrite = true)
        {
            if (!Directory.Exists(unCompressPath))
            {
                Directory.CreateDirectory(unCompressPath);
            }
            using (Stream stream = File.OpenRead(ZipFile))
            using (var archive = ArchiveFactory.Open(stream))
            {
                SharpCompress.Common.ArchiveEncoding.Default = Encoding.Default;
                foreach (var entry in archive.Entries.Where(entry => !entry.IsDirectory))
                {
                    if (FileWillDecompress != null)
                    {
                        if (!FileWillDecompress(entry.Key))
                        {
                            continue;
                        }
                    }
                    entry.WriteToDirectory(unCompressPath, new ExtractionOptions()
                    {
                        Overwrite = true
                    });
                    if (NewFileDecompress != null)
                    {
                        NewFileDecompress(Path.Combine(unCompressPath, Path.GetFileName(entry.Key)));
                    }
                }
            }
        }
    }
}