namespace AcDream.Headless.Tests;

public sealed class HeadlessEntryPointTests
{
    [Theory]
    [InlineData("--help")]
    [InlineData("-h")]
    public void HelpIsPresentationFreeAndSuccessful(string argument)
    {
        using var output = new StringWriter();
        using var error = new StringWriter();

        int exitCode = HeadlessEntryPoint.Run(
            [argument],
            output,
            error);

        Assert.Equal(0, exitCode);
        Assert.Contains("acdream-headless", output.ToString());
        Assert.Contains("Secrets are never accepted", output.ToString());
        Assert.Equal(string.Empty, error.ToString());
    }

    [Fact]
    public void ValidateAcceptsStrictEmptyNoConnectConfiguration()
    {
        using var file = TemporaryConfiguration.Create(
            """{"version":1,"sessions":[]}""");
        using var output = new StringWriter();
        using var error = new StringWriter();

        int exitCode = HeadlessEntryPoint.Run(
            ["validate", "--config", file.Path],
            output,
            error);

        Assert.Equal(0, exitCode);
        Assert.Contains("0 session(s)", output.ToString());
        Assert.Equal(string.Empty, error.ToString());
    }

    [Theory]
    [InlineData("""{"version":2,"sessions":[]}""", "Unsupported configuration version")]
    [InlineData("""{"version":1,"sessions":[],"password":"secret"}""", "could not be mapped")]
    [InlineData("""{"version":1,"sessions":[{"id":"bot"},{"id":"bot"}]}""", "Duplicate session id")]
    [InlineData("""{"version":1,"sessions":[null]}""", "non-empty id")]
    [InlineData("""{"version":1}""", "required properties")]
    public void ValidateRejectsInvalidOrSecretShapedConfiguration(
        string json,
        string expectedError)
    {
        using var file = TemporaryConfiguration.Create(json);
        using var output = new StringWriter();
        using var error = new StringWriter();

        int exitCode = HeadlessEntryPoint.Run(
            ["validate", "--config", file.Path],
            output,
            error);

        Assert.Equal(3, exitCode);
        Assert.Contains(
            expectedError,
            error.ToString(),
            StringComparison.OrdinalIgnoreCase);
        Assert.DoesNotContain("secret", error.ToString());
        Assert.Equal(string.Empty, output.ToString());
    }

    [Fact]
    public void UnknownCommandReturnsUsageError()
    {
        using var output = new StringWriter();
        using var error = new StringWriter();

        int exitCode = HeadlessEntryPoint.Run(
            ["connect", "--password", "secret"],
            output,
            error);

        Assert.Equal(2, exitCode);
        Assert.DoesNotContain("secret", error.ToString());
        Assert.Equal(string.Empty, output.ToString());
    }

    private sealed class TemporaryConfiguration : IDisposable
    {
        private TemporaryConfiguration(string path)
        {
            Path = path;
        }

        internal string Path { get; }

        internal static TemporaryConfiguration Create(string json)
        {
            string path = System.IO.Path.Combine(
                System.IO.Path.GetTempPath(),
                $"acdream-headless-{Guid.NewGuid():N}.json");
            File.WriteAllText(path, json);
            return new TemporaryConfiguration(path);
        }

        public void Dispose()
        {
            File.Delete(Path);
        }
    }
}