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

namespace XenAdminTests.ArchiveTests
{
    class ArchiveFactoryTests
    {
        [Test]
        public void TestValidReaderGeneration()
        {
            Dictionary<ArchiveFactory.Type, Type> validIterators = new Dictionary<ArchiveFactory.Type, Type>() 
            { 
                { ArchiveFactory.Type.Tar, typeof( SharpZipTarArchiveIterator )},
                { ArchiveFactory.Type.TarGz, typeof( SharpZipTarArchiveIterator )},
                { ArchiveFactory.Type.TarBz2, typeof( SharpZipTarArchiveIterator )}
            };

            foreach (KeyValuePair<ArchiveFactory.Type, Type> pair in validIterators)
            {
                string target = Path.Combine(Directory.GetCurrentDirectory(), @"XenAdminTests\TestResources\emptyfile.bz2");
                using (MemoryStream ms = new MemoryStream(File.ReadAllBytes(target)))
                {
                    ArchiveIterator providedStream = ArchiveFactory.Reader(pair.Key, ms);
                    Assert.AreEqual(providedStream.GetType(), pair.Value);
                }
            }
        }

        [Test]
        public void TestValidWriterGeneration()
        {
            Dictionary<ArchiveFactory.Type, Type> validIterators = new Dictionary<ArchiveFactory.Type, Type>() 
            { 
                { ArchiveFactory.Type.Tar, typeof( SharpZipTarArchiveWriter )},
                { ArchiveFactory.Type.Zip, typeof( DotNetZipZipWriter )}
            };

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

        [Test]
        public void TestInvalidTarGzWriterGeneration()
        {
            Assert.That(()=> CreateInvalidWriterType(ArchiveFactory.Type.TarGz), Throws.Exception.With.TypeOf(typeof(NotSupportedException)));
        }

        [Test]
        public void TestInvalidTarBz2WriterGeneration()
        {
            Assert.That(() => CreateInvalidWriterType(ArchiveFactory.Type.TarBz2), Throws.Exception.With.TypeOf(typeof(NotSupportedException))); 
        }

        private void CreateInvalidWriterType(ArchiveFactory.Type type)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                ArchiveFactory.Writer(type, ms);
            }
        }
    }
}
