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using System;
using System.IO;
using System.Text;
using NUnit.Framework;
using XenCenterLib.Archive;

namespace XenAdminTests.ArchiveTests
{
    [TestFixture, Category(TestCategories.Unit)]
    public class ArchiveIteratorTests
    {
        #region ArchiveIterator Fake 
        private class ArchiveIteratorFake : ArchiveIterator
        {
            private Stream extractedFile;
            private bool disposed;

            public int NumberOfCallsLeftReturn { private get; set; }

            public Stream ExtractedFileReturn
            {
                set 
                { 
                    extractedFile = value;
                    disposed = false;
                }
            }
            public string CurrentFileNameReturn { private get; set; }
            public long CurrentFileSizeReturn { private get; set; }
            public DateTime ModTimeReturn { private get; set; }
            public bool IsDirectoryReturn { private get; set; }

            public ArchiveIteratorFake()
            {
                Reset();
            }

            public void Reset()
            {
                CurrentFileNameReturn = "TestFileName.fake";
                CurrentFileSizeReturn = 100;
                ExtractedFileReturn = new MemoryStream(Encoding.ASCII.GetBytes("This is a test"));
                IsDirectoryReturn = false;
                ModTimeReturn = new DateTime(2011, 4, 1, 11, 04, 01);
                NumberOfCallsLeftReturn = 1;
            }

            public override bool HasNext()
            {
                if (NumberOfCallsLeftReturn < 1)
                    return false;

                NumberOfCallsLeftReturn--;
                return true;
            }

            public override void ExtractCurrentFile(Stream extractedFileContents, Action cancellingDelegate)
            {
                byte[] buffer = new byte[2 * 1024 * 1024];
                int read;
                while ((read = extractedFile.Read(buffer, 0, buffer.Length)) > 0)
                {
                    extractedFileContents.Write(buffer, 0, read);
                }
                extractedFile.Position = 0;
            }

            public override string CurrentFileName()
            {
                if (String.IsNullOrEmpty(CurrentFileNameReturn))
                    return CurrentFileNameReturn;

                return NumberOfCallsLeftReturn + CurrentFileNameReturn;
            }

            public override long CurrentFileSize()
            {
                return CurrentFileSizeReturn;
            }

            public override DateTime CurrentFileModificationTime()
            {
                return ModTimeReturn;
            }

            public override bool IsDirectory()
            {
                return IsDirectoryReturn;
            }

            protected override void Dispose(bool disposing)
            {
                base.Dispose(disposing);
                if( !disposed )
                {
                    if( disposing )
                    {
                        if(extractedFile != null)
                            extractedFile.Dispose();
                    }
                }
            }
        }
        #endregion

        private ArchiveIteratorFake fakeIterator;

        [OneTimeSetUp]
        public void Setup()
        {
            fakeIterator = new ArchiveIteratorFake();
        }

        [OneTimeTearDown]
        public void TearDown()
        {
            fakeIterator.Dispose();
        }

        [SetUp]
        public void TestSetup()
        {
            fakeIterator.Reset();
        }


        [Test]
        public void AnExceptionIsThrownForNullArgumentWhenCallingExtractAllContents()
        {
            Assert.Throws(typeof(ArgumentNullException), () => fakeIterator.ExtractAllContents(null));
        }

        [Test]
        public void AnExceptionIsThrownForANullFileNameWhenCallingExtractAllContents()
        {
            fakeIterator.CurrentFileNameReturn = null;
            Assert.Throws(typeof(ArgumentNullException), () => fakeIterator.ExtractAllContents(Path.GetTempPath()));
        }
        
        [Test]
        public void VerifyAFileIsWrittenWhenCallingExtractAllContents()
        {
            string tempPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
            const int numberOfFiles = 3;
            fakeIterator.NumberOfCallsLeftReturn = numberOfFiles;
            fakeIterator.ExtractAllContents(tempPath);

            //Test file has been created
            string targetFile = Path.Combine(tempPath, fakeIterator.CurrentFileName());
            Assert.IsTrue(File.Exists(targetFile), "File Exists");

            Assert.IsTrue(File.ReadAllBytes(targetFile).Length > 1, "File length > 1");

            //Check recursively that there are only the correct number of files
            Assert.IsTrue(Directory.GetFiles(tempPath, "*.*", SearchOption.AllDirectories).Length == numberOfFiles, "File number is correct");

            Assert.IsFalse((File.GetAttributes(targetFile) & FileAttributes.Directory) == FileAttributes.Directory, "Is not a dir");

            Directory.Delete(tempPath,true);
        }

        [Test]
        public void VerifyADirectoryIsWrittenWhenCallingExtractAllContents()
        {
            string tempPath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
            fakeIterator.IsDirectoryReturn = true;
            fakeIterator.CurrentFileNameReturn = "FakePath" + Path.DirectorySeparatorChar;
            fakeIterator.ExtractAllContents(tempPath);

            //Test file has been created
            string targetPath = Path.Combine(tempPath, fakeIterator.CurrentFileName());
            Assert.IsFalse(File.Exists(targetPath), "No files exist");
            Assert.IsTrue(Directory.Exists(targetPath), "Directories exist");

            //No files - just a directory
            Assert.IsTrue(Directory.GetFiles(tempPath).Length < 1, "No file in the directory" );

            //Check it's a directory
            Assert.IsTrue((File.GetAttributes(targetPath) & FileAttributes.Directory) == FileAttributes.Directory, "Has directory attributes");

            Directory.Delete(tempPath, true);
        }

    }
}