using System;
using System.IO;
using System.Text;
using System.Threading;
using Moq;
using NUnit.Framework;
using Umbraco.Core.IO;
using Umbraco.Core.Logging;
using Umbraco.Tests.TestHelpers;


namespace Umbraco.Tests.IO
{
    [TestFixture]
    [Apartment(ApartmentState.STA)]
    public class PhysicalFileSystemTests : AbstractFileSystemTests
    {
        public PhysicalFileSystemTests()
            : base(new PhysicalFileSystem(TestHelper.IOHelper, TestHelper.GetHostingEnvironment(), Mock.Of<ILogger>(), Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "FileSysTests"), "/Media/"))
        { }

        [SetUp]
        public void Setup()
        {

        }

        [TearDown]
        public void TearDown()
        {
            var path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "FileSysTests");
            if (Directory.Exists(path) == false) return;

            var files = Directory.GetFiles(path);
            foreach (var f in files)
            {
                File.Delete(f);
            }
            Directory.Delete(path, true);
        }

        protected override string ConstructUrl(string path)
        {
            return "/Media/" + path;
        }

        private string Repeat(string pattern, int count)
        {
            var text = new StringBuilder();
            for (var i = 0; i < count; i++)
                text.Append(pattern);
            return text.ToString();
        }

        [Test]
        public void SaveFileTest()
        {
            var basePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "FileSysTests");

            using (var ms = new MemoryStream(Encoding.UTF8.GetBytes("foo")))
                _fileSystem.AddFile("sub/f3.txt", ms);

            Assert.IsTrue(File.Exists(Path.Combine(basePath, "sub/f3.txt")));

            var path = Repeat("bah/bah/", 50);
            Assert.Less(260, path.Length);

            Assert.Throws<PathTooLongException>(() =>
            {
                using (var ms = new MemoryStream(Encoding.UTF8.GetBytes("foo")))
                    _fileSystem.AddFile(path + "f3.txt", ms);
            });
        }

        [Test]
        public void GetFullPathTest()
        {
            // outside of tests, one initializes the PhysicalFileSystem with eg ~/Dir
            // and then, rootPath = /path/to/Dir and rootUrl = /Dir/
            // here we initialize the PhysicalFileSystem with
            // rootPath = /path/to/FileSysTests
            // rootUrl = /Media/

            var basePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "FileSysTests");

            // ensure that GetFullPath
            // - does return the proper full path
            // - does properly normalize separators
            // - does throw on invalid paths

            // works
            var path = _fileSystem.GetFullPath("foo.tmp");
            Assert.AreEqual(Path.Combine(basePath, @"foo.tmp"), path);

            // a very long relative path, which ends up being a short path, works
            path = Repeat("bah/../", 50);
            Assert.Less(260, path.Length);
            path = _fileSystem.GetFullPath(path + "foo.tmp");
            Assert.AreEqual(Path.Combine(basePath, @"foo.tmp"), path);

            // works too
            path = _fileSystem.GetFullPath("foo/bar.tmp");
            Assert.AreEqual(Path.Combine(basePath, @"foo\bar.tmp"), path);

            // that path is invalid as it would be outside the root directory
            Assert.Throws<UnauthorizedAccessException>(() => _fileSystem.GetFullPath("../../foo.tmp"));

            // a very long path, which ends up being very long, works
            path = Repeat("bah/bah/", 50);
            Assert.Less(260, path.Length);
            Assert.Throws<PathTooLongException>(() =>
            {
                path = _fileSystem.GetFullPath(path + "foo.tmp");
                Assert.Less(260, path.Length); // gets a >260 path and it's fine (but Windows will not like it)
            });
        }
    }
}