using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Crm.SdkTypeProxy;
using System.IO;
using System.IO.Compression;

public class CrmCustomizations
{
    private CrmService _service = null;
    public CrmCustomizations(CrmService service)
    {
        _service = service;
    }

    public bool Backup(string filePath)
    {
        bool backedup = false;

        if (_service != null)
        {
            // grab all the customizations first
            ExportAllXmlRequest request = new ExportAllXmlRequest();
            ExportAllXmlResponse response = _service.Execute(request) as ExportAllXmlResponse;

            byte[] data = Encoding.ASCII.GetBytes(response.ExportXml);

            // prepare the backup file
            if (File.Exists(filePath)) { File.Delete(filePath); }
            FileStream fs = File.Create(filePath);

            // check if we need to create a zip file
            bool createZip = Path.GetExtension(filePath).ToLower().Equals(".zip");
            if (createZip)
            {
                GZipStream gzs = new GZipStream(fs, CompressionMode.Compress, true);
                gzs.Write(data, 0, data.Length);
                gzs.Close();
            }
            else
            {
                fs.Write(data, 0, data.Length);
            }
            fs.Close();

            backedup = true;
        }

        return backedup;
    }

    public bool Restore(string filePath)
    {
        bool restored = false;

        if (_service != null && File.Exists(filePath))
        {
            string customizationXml = ReadData(filePath);
            if (!string.IsNullOrEmpty(customizationXml))
            {
                ImportAllXmlRequest request = new ImportAllXmlRequest { CustomizationXml = customizationXml };
                //_service.Execute(request);

                restored = true;
            }
        }

        return restored;
    }

    public bool Publish()
    {
        bool published = false;

        if (_service != null)
        {
            PublishAllXmlRequest request = new PublishAllXmlRequest();
            _service.Execute(request);

            published = true;
        }

        return published;
    }

    private string ReadData(string filePath)
    {
        FileStream fs = File.Open(filePath, FileMode.Open);
        byte[] data = new byte[fs.Length];

        bool isZip = Path.GetExtension(filePath).ToLower().Equals(".zip");
        if (isZip)
        {
            GZipStream gzs = new GZipStream(fs, CompressionMode.Decompress, true);
            // decompress
            MemoryStream stream = new MemoryStream();
            byte[] b = new byte[4096];
            while (true)
            {
                int n = gzs.Read(b, 0, b.Length);
                if (n > 0) { stream.Write(b, 0, n); }
                else { break; }
            }

            data = stream.ToArray();

            stream.Close();
            gzs.Close();
        }
        else
        {
            fs.Read(data, 0, data.Length);
        }

        fs.Close();

        return Encoding.ASCII.GetString(data);
    }
}