#region Disclaimer / License
// Copyright (C) 2008, Kenneth Skovhede
// http://www.hexad.dk, opensource@hexad.dk
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
// 
#endregion
using System;
using System.Collections.Generic;
using System.Text;

namespace Duplicati.Compression
{
    public class Compression : IDisposable
    {
        private bool m_writing;
        private ICSharpCode.SharpZipLib.Zip.ZipFile m_zipfile;
        private string m_filename;

        public Compression(string basefolder, string zipfile)
        {
            m_writing = true;
            m_filename = zipfile;
            m_zipfile = ICSharpCode.SharpZipLib.Zip.ZipFile.Create(zipfile);
            m_zipfile.EntryFactory.NameTransform = new ICSharpCode.SharpZipLib.Zip.ZipNameTransform(Core.Utility.AppendDirSeperator(basefolder));
        }

        public long AddFile(string file)
        {
            if (!m_writing)
                throw new InvalidOperationException("Cannot write to a file while reading it");

            m_zipfile.BeginUpdate();
            m_zipfile.Add(file);
            m_zipfile.CommitUpdate();

            return new System.IO.FileInfo(m_filename).Length;
        }

        public Compression(string zipfile)
        {
            m_writing = false;
            m_filename = zipfile;
            ICSharpCode.SharpZipLib.Zip.ZipFile zip = new ICSharpCode.SharpZipLib.Zip.ZipFile(zipfile);
        }


        /// <summary>
        /// Compresses a folder into a single compressed file
        /// </summary>
        /// <param name="folder">The folder to compress</param>
        /// <param name="outputfile">The name of the compressed file</param>
        public static void Compress(string folder, string outputfile, string rootfolder)
        {
            ICSharpCode.SharpZipLib.Zip.ZipFile file = ICSharpCode.SharpZipLib.Zip.ZipFile.Create(outputfile);
            folder = Core.Utility.AppendDirSeperator(folder);
            
            file.EntryFactory.NameTransform = new ICSharpCode.SharpZipLib.Zip.ZipNameTransform(rootfolder);

            foreach (string s in Core.Utility.EnumerateFiles(folder))
            {
                file.BeginUpdate();
                file.Add(s);
                file.CommitUpdate();
            }

            file.Close();
            
        }

        /// <summary>
        /// Decompresses a file into its original directory structure
        /// </summary>
        /// <param name="file">The name of the compressed file</param>
        /// <param name="targetfolder">The folder where the data is extracted to</param>
        public static void Decompress(string file, string targetfolder)
        {
            ICSharpCode.SharpZipLib.Zip.ZipFile zip = new ICSharpCode.SharpZipLib.Zip.ZipFile(file);
            foreach (ICSharpCode.SharpZipLib.Zip.ZipEntry ze in zip)
            {
                string target = System.IO.Path.Combine(targetfolder, ze.Name);
                if (!System.IO.Directory.Exists(System.IO.Path.GetDirectoryName(target)))
                    System.IO.Directory.CreateDirectory(System.IO.Path.GetDirectoryName(target));

                using (System.IO.FileStream fs = new System.IO.FileStream(target, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.None))
                    Core.Utility.CopyStream(zip.GetInputStream(ze), fs);
            }
        }

        #region IDisposable Members

        public void Dispose()
        {
            try
            {
                if (m_zipfile != null)
                    m_zipfile.Close();
                m_zipfile = null;
            }
            catch
            {
            }
        }

        #endregion
    }
}