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using System;
using System.Collections.Generic;
using System.IO;
using NUnit.Framework;
using XenAdmin;
using XenCenterLib.Compression;

namespace XenAdminTests.CompressionTests
{
    [TestFixture, Category(TestCategories.UICategoryA)]
    class CompressionFactoryTests
    {
        [Test]
        public void TestWriterGeneration()
        {
            Dictionary<CompressionFactory.Type, Type> validWriters = new Dictionary<CompressionFactory.Type, Type>() 
            { 
                { CompressionFactory.Type.Gz, typeof( DotNetZipGZipOutputStream )},
                { CompressionFactory.Type.Bz2, typeof( DotNetZipBZip2OutputStream )}
            };

            foreach (KeyValuePair<CompressionFactory.Type, Type> pair in validWriters)
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    using( CompressionStream providedStream = CompressionFactory.Writer(pair.Key, ms))
                    {
                        Assert.AreEqual(providedStream.GetType(), pair.Value);  
                    }
                    
                }
            }
        }

        [Test]
        public void TestReaderGeneration()
        {
            Dictionary<CompressionFactory.Type, Type> validReaders = new Dictionary<CompressionFactory.Type, Type>() 
            { 
                { CompressionFactory.Type.Gz, typeof( DotNetZipGZipInputStream )},
                { CompressionFactory.Type.Bz2, typeof( DotNetZipBZip2InputStream )}
            };

            foreach (KeyValuePair<CompressionFactory.Type, Type> pair in validReaders)
            {
                string target = Path.Combine(Directory.GetCurrentDirectory(), @"XenAdminTests\TestResources", "emptyfile.bz2");
                /*
                 * Note: Reading a bzip2 file in as a byte[] works for gzip as well as bzip2 stream 
                 * as the implementation of bzip2 must be initialised with a string containing a 
                 * header, EOF etc.. whereas gzip doesn't mind so the following will work despite
                 * opening a gzip compression stream with a bzip2 data
                 */
                using (MemoryStream ms = new MemoryStream(File.ReadAllBytes(target))) 
                {
                    using( CompressionStream providedStream = CompressionFactory.Reader(pair.Key, ms))
                    {
                        Assert.AreEqual(providedStream.GetType(), pair.Value);
                    }
                    
                }
            }
        }

        /*
         * The BZip2 stream provided must contain actual BZip2 data, header, data etc..
         * As this is not the case then this null construction will throw an exception
         */
        [Test]
        public void TestFailingReaderGeneration()
        {
            Assert.Throws<IOException>(() =>
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CompressionFactory.Reader(CompressionFactory.Type.Bz2, ms))
                    { }
                }
            });
        }
    }
}
