using System;
using System.IO;
using System.Text;
using System.Threading.Tasks;

using CliWrap;

using MfGames.IO.Extensions;
using MfGames.Nitride.Tests;

using Xunit;
using Xunit.Abstractions;

namespace CopyFiles;

/// <summary>
/// Tests the execution of the tool and ensures it is working correctly.
/// </summary>
public class CopyFilesTest : NitrideTestBase
{
    public CopyFilesTest(ITestOutputHelper output)
        : base(output)
    {
    }

    [Fact]
    public async Task Run()
    {
        // Figure out the paths for this test.
        DirectoryInfo rootDir =
            typeof(CopyFilesProgram).GetDirectory()!.FindGitRoot()!
                .GetDirectory("examples/CopyFiles");

        DirectoryInfo outputDir = rootDir.GetDirectory("output");
        FileInfo projectFile = rootDir.GetFile("CopyFiles.csproj");

        this.Logger.Error("A {0}", rootDir);

        // Clear out the output directory if we have an old one.
        if (outputDir.Exists)
        {
            outputDir.Delete(true);
        }

        // Execute the generator. This will throw if there is an exception.
        StringBuilder output = new();

        try
        {
            await Cli
                .Wrap("dotnet")
                .WithWorkingDirectory(projectFile.DirectoryName!)
                .WithArguments(
                    argumentsBuilder => argumentsBuilder
                        .Add("run")
                        .Add("--no-build")
                        .Add("--")
                        .Add("build"))
                .WithStandardOutputPipe(PipeTarget.ToStringBuilder(output))
                .WithStandardErrorPipe(PipeTarget.ToStringBuilder(output))
                .ExecuteAsync();
        }
        catch (Exception exception)
        {
            this.Logger.Fatal(
                exception,
                "There was an exception running the command:\n\n{Log:l}",
                output);
            throw;
        }

        // Make sure we have our output.
        FileInfo aFile = outputDir.GetFile("a.txt");

        Assert.True(aFile.Exists);

        string aText = aFile.ReadAllText()
            .Trim();

        Assert.Equal("This is the 'A' file.", aText);
    }
}