using System.Linq;
using Autofac;
using Nitride.Contents;
using Nitride.IO.Contents;
using Xunit;
using Xunit.Abstractions;
using Zio;
using Zio.FileSystems;

namespace Nitride.IO.Tests
{
    /// <summary>
    /// Tests the functionality of the WriteFiles().
    /// </summary>
    public class WriteFilesTest : NitrideIOTestsBase
    {
        private readonly MemoryFileSystem fileSystem;

        public WriteFilesTest(ITestOutputHelper output)
            : base(output)
        {
            this.fileSystem = new MemoryFileSystem();
            this.fileSystem.CreateDirectory("/b1");
            this.fileSystem.CreateDirectory("/c1");
            this.fileSystem.CreateDirectory("/c1/c2");
            this.fileSystem.CreateDirectory("/d1");
            this.fileSystem.WriteAllText("/a.txt", "File A");
            this.fileSystem.WriteAllText("/b1/b.md", "File B");
            this.fileSystem.WriteAllText("/c1/c2/e.md", "File E");
        }

        [Fact]
        public void WriteAllFiles()
        {
            // Set up the operation.
            var output = new MemoryFileSystem();
            var readFiles = this.Container.Resolve<ReadFiles.Factory>();
            var factory = this.Container.Resolve<WriteFiles.Factory>();
            WriteFiles op = factory(output);

            // Read and write out the files. We switch one of the files to be
            // text content to make sure that works too.
            readFiles(this.fileSystem)
                .Read()
                .Select(
                    x => x.Get<UPath>() == "/b1/b.md"
                        ? x.SetTextContent(
                            ((ITextContentConvertable)x.GetBinaryContent())
                            .ToTextContent())
                        : x)
                .Run(op);

            // Verify the results.
            Assert.True(output.FileExists("/a.txt"));
            Assert.True(output.FileExists("/b1/b.md"));
            Assert.True(output.FileExists("/c1/c2/e.md"));

            Assert.Equal("File A", output.ReadAllText("/a.txt"));
            Assert.Equal("File B", output.ReadAllText("/b1/b.md"));
            Assert.Equal("File E", output.ReadAllText("/c1/c2/e.md"));
        }
    }
}