namespace ZB.MOM.WW.ScadaBridge.ClusterInfrastructure.Tests;

/// <summary>
/// <see cref="ClusterOptionsValidator"/> for the opt-in Akka.Remote TLS block
/// (<c>ScadaBridge:Cluster:RemotingTls</c>, ScadaBridge#64). Disabled must check nothing — so the
/// default configuration can never be blocked by it — and enabled must refuse the shapes that would
/// boot into a pair that silently never joins.
/// </summary>
public class ClusterRemotingTlsValidatorTests
{
    private static ClusterOptions Options(bool tlsSeeds, ClusterRemotingTlsOptions tls)
    {
        var scheme = tlsSeeds ? "akka.ssl.tcp" : "akka.tcp";
        return new ClusterOptions
        {
            SeedNodes = new List<string> { $"{scheme}://scadabridge@node1:8081", $"{scheme}://scadabridge@node2:8081" },
            SplitBrainResolverStrategy = "auto-down",
            RemotingTls = tls,
        };
    }

    private static ClusterRemotingTlsOptions PathTls() => new()
    {
        Enabled = true,
        CertificatePath = "/certs/node1.pfx",
        CertificatePassword = "pw",
    };

    /// <summary>Verifies TLS is off by default.</summary>
    [Fact]
    public void RemotingTls_is_off_by_default()
    {
        Assert.False(new ClusterOptions().RemotingTls.Enabled);
    }

    /// <summary>
    /// Verifies a disabled block carrying garbage (both sources, a bad store location) is not checked:
    /// with TLS off the fields are inert, and validating them would let an unused block break a boot.
    /// </summary>
    [Fact]
    public void Disabled_block_is_not_validated()
    {
        var tls = new ClusterRemotingTlsOptions
        {
            Enabled = false,
            CertificatePath = "/x.pfx",
            CertificateThumbprint = "ABC",
            StoreLocation = "nowhere",
        };

        var result = new ClusterOptionsValidator().Validate(null, Options(tlsSeeds: false, tls));

        Assert.True(result.Succeeded, result.FailureMessage);
    }

    /// <summary>Verifies a file-certificate TLS config with akka.ssl.tcp seeds is valid.</summary>
    [Fact]
    public void Enabled_with_path_and_tls_seeds_is_valid()
    {
        var result = new ClusterOptionsValidator().Validate(null, Options(tlsSeeds: true, PathTls()));

        Assert.True(result.Succeeded, result.FailureMessage);
    }

    /// <summary>Verifies a store-thumbprint TLS config with akka.ssl.tcp seeds is valid.</summary>
    [Fact]
    public void Enabled_with_thumbprint_and_tls_seeds_is_valid()
    {
        var tls = new ClusterRemotingTlsOptions { Enabled = true, CertificateThumbprint = "45df32e258c92a7abf6c112e54912ab15bbb9eb0" };

        var result = new ClusterOptionsValidator().Validate(null, Options(tlsSeeds: true, tls));

        Assert.True(result.Succeeded, result.FailureMessage);
    }

    /// <summary>
    /// Verifies TLS with akka.tcp seeds is refused: Akka.Remote advertises akka.ssl.tcp once SSL is on,
    /// so those seeds name an address nobody answers and the join retries forever.
    /// </summary>
    [Fact]
    public void Enabled_with_plain_tcp_seeds_fails()
    {
        var result = new ClusterOptionsValidator().Validate(null, Options(tlsSeeds: false, PathTls()));

        Assert.True(result.Failed);
        Assert.Contains("akka.ssl.tcp://", result.FailureMessage);
        Assert.Contains("akka.tcp://scadabridge@node1:8081", result.FailureMessage);
    }

    /// <summary>Verifies exactly one certificate source is required.</summary>
    /// <param name="path">The certificate path, or null.</param>
    /// <param name="thumbprint">The thumbprint, or null.</param>
    [Theory]
    [InlineData(null, null)]
    [InlineData("/certs/node1.pfx", "45df32e258c92a7abf6c112e54912ab15bbb9eb0")]
    public void Enabled_requires_exactly_one_certificate_source(string? path, string? thumbprint)
    {
        var tls = new ClusterRemotingTlsOptions { Enabled = true, CertificatePath = path, CertificateThumbprint = thumbprint };

        var result = new ClusterOptionsValidator().Validate(null, Options(tlsSeeds: true, tls));

        Assert.True(result.Failed);
        Assert.Contains("exactly one certificate source", result.FailureMessage);
    }

    /// <summary>Verifies an unknown store location is refused for a thumbprint certificate.</summary>
    [Fact]
    public void Enabled_thumbprint_rejects_unknown_store_location()
    {
        var tls = new ClusterRemotingTlsOptions { Enabled = true, CertificateThumbprint = "ABC", StoreLocation = "LocalMachine" };

        var result = new ClusterOptionsValidator().Validate(null, Options(tlsSeeds: true, tls));

        Assert.True(result.Failed);
        Assert.Contains("StoreLocation", result.FailureMessage);
    }
}