using System;
using System.IO;
using NUnit.Framework;
using Orchard.Azure.FileSystems.Media;
using Microsoft.WindowsAzure;
using System.Linq;
using Orchard.Environment.Configuration;

namespace Orchard.Azure.Tests.FileSystems.Media {
    [TestFixture]
    public class AzureBlobStorageProviderTests : AzureVirtualEnvironmentTest {

        private AzureBlobStorageProvider _azureBlobStorageProvider;

        protected override void OnInit() {
            CloudStorageAccount devAccount;
            CloudStorageAccount.TryParse("UseDevelopmentStorage=true", out devAccount);

            _azureBlobStorageProvider = new AzureBlobStorageProvider(new ShellSettings { Name = "default" }, devAccount);
        }

        [SetUp]
        public void Setup() {
            // ensure default container is empty before running any test
            DeleteAllBlobs(_azureBlobStorageProvider.Container);
        }

        [Test]
        [ExpectedException(typeof(ArgumentException))]
        public void GetFileShouldOnlyAcceptRelativePath() {
            _azureBlobStorageProvider.CreateFile("foo.txt");
            _azureBlobStorageProvider.GetFile("/foot.txt");
        }

        [Test]
        [ExpectedException(typeof(ArgumentException))]
        public void GetFileThatDoesNotExistShouldThrow() {
            _azureBlobStorageProvider.GetFile("notexisting");
        }

        [Test]
        [ExpectedException(typeof(ArgumentException))]
        public void DeleteFileThatDoesNotExistShouldThrow() {
            _azureBlobStorageProvider.DeleteFile("notexisting");
        }

        [Test]
        public void CreateFileShouldReturnCorrectStorageFile() {
            var storageFile = _azureBlobStorageProvider.CreateFile("foo.txt");

            Assert.AreEqual(".txt", storageFile.GetFileType());
            Assert.AreEqual("foo.txt", storageFile.GetName());
            Assert.AreEqual("foo.txt", storageFile.GetPath());
            Assert.AreEqual(0, storageFile.GetSize());
        }

        [Test]
        [ExpectedException(typeof(ArgumentException))]
        public void CreateFileShouldThrowAnExceptionIfAlreadyExisting() {
            var storageFile = _azureBlobStorageProvider.CreateFile("foo.txt");
            Assert.AreEqual(storageFile.GetSize(), 0);

            _azureBlobStorageProvider.CreateFile("foo.txt");
        }

        [Test]
        public void RenameFileShouldCreateANewFileAndRemoveTheOld() {
            _azureBlobStorageProvider.CreateFile("foo1.txt");
            _azureBlobStorageProvider.RenameFile("foo1.txt", "foo2.txt");

            var files = _azureBlobStorageProvider.ListFiles("");

            Assert.AreEqual(1, files.Count());
            Assert.That(files.First().GetPath().Equals("foo2.txt"), Is.True);
            Assert.That(files.First().GetName().Equals("foo2.txt"), Is.True);
        }

        [Test]
        public void CreateFileShouldBeFolderAgnostic() {
            _azureBlobStorageProvider.CreateFile("foo.txt");
            _azureBlobStorageProvider.CreateFile("folder/foo.txt");
            _azureBlobStorageProvider.CreateFile("folder/folder/foo.txt");

            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("").Count());
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder").Count());
            Assert.AreEqual("folder/foo.txt", _azureBlobStorageProvider.ListFiles("folder").First().GetPath());
            Assert.AreEqual("foo.txt", _azureBlobStorageProvider.ListFiles("folder").First().GetName());
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder/folder").Count());
            Assert.AreEqual("folder/folder/foo.txt", _azureBlobStorageProvider.ListFiles("folder/folder").First().GetPath());
            Assert.AreEqual("foo.txt", _azureBlobStorageProvider.ListFiles("folder/folder").First().GetName());
        }

        [Test]
        [ExpectedException(typeof(ArgumentException))]
        public void CreateFolderThatExistsShouldThrow() {
            _azureBlobStorageProvider.CreateFile("folder/foo.txt");
            _azureBlobStorageProvider.CreateFolder("folder");
        }

        [Test]
        public void ListFolderShouldAcceptNullPath() {
            _azureBlobStorageProvider.CreateFolder("folder");
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFolders(null).Count());
            Assert.AreEqual("folder", _azureBlobStorageProvider.ListFolders(null).First().GetName());
            Assert.AreEqual("folder", _azureBlobStorageProvider.ListFolders(null).First().GetPath());
        }

        [Test]
        public void DeleteFolderShouldDeleteFilesAlso() {
            _azureBlobStorageProvider.CreateFile("folder/foo1.txt");
            _azureBlobStorageProvider.CreateFile("folder/foo2.txt");
            _azureBlobStorageProvider.CreateFile("folder/folder/foo1.txt");
            _azureBlobStorageProvider.CreateFile("folder/folder/foo2.txt");

            Assert.AreEqual(2, _azureBlobStorageProvider.ListFiles("folder").Count());
            Assert.AreEqual(2, _azureBlobStorageProvider.ListFiles("folder/folder").Count());

            _azureBlobStorageProvider.DeleteFolder("folder");

            Assert.AreEqual(0, _azureBlobStorageProvider.ListFiles("folder").Count());
            Assert.AreEqual(0, _azureBlobStorageProvider.ListFiles("folder/folder").Count());
        }

        [Test]
        public void ShouldRenameFolders() {
            _azureBlobStorageProvider.CreateFile("folder1/foo.txt");
            _azureBlobStorageProvider.CreateFile("folder2/foo.txt");
            _azureBlobStorageProvider.CreateFile("folder1/folder2/foo.txt");
            _azureBlobStorageProvider.CreateFile("folder1/folder2/folder3/foo.txt");

            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder1").Count());
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder2").Count());
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder1/folder2").Count());
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder1/folder2/folder3").Count());

            _azureBlobStorageProvider.RenameFolder("folder1/folder2", "folder1/folder4");

            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder1").Count());
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder2").Count());
            Assert.AreEqual(0, _azureBlobStorageProvider.ListFiles("folder1/folder2").Count());
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder1/folder4").Count());
            Assert.AreEqual(1, _azureBlobStorageProvider.ListFiles("folder1/folder4/folder3").Count());
        }

        [Test]
        public void ShouldReadWriteFiles() {
            const string teststring = "This is a test string.";

            var foo = _azureBlobStorageProvider.CreateFile("folder1/foo.txt");

            using ( var stream = foo.OpenWrite() )
            using ( var writer = new StreamWriter(stream) )
                writer.Write(teststring);

            Assert.AreEqual(22, foo.GetSize());

            string content;
            using ( var stream = foo.OpenRead() )
            using ( var reader = new StreamReader(stream) ) {
                content = reader.ReadToEnd();
            }

            Assert.AreEqual(teststring, content);
        }
    }
}