using FinalFactory.Rendezvous.Server.Abuse;
using FinalFactory.Rendezvous.Server.Deployment;

namespace FinalFactory.Rendezvous.Tests.Deployment;

public sealed class DeploymentOptionsTests
{
    [Fact]
    public void ProductionConfigurationAcceptsExplicitPublicEndpointsAndTrustBoundary()
    {
        DeploymentOptions options = ValidOptions();
        AbuseProtectionOptions abuse = new()
        {
            TrustedProxyAddresses = ["192.0.2.10"],
        };

        IReadOnlyList<string> errors = options.ValidateProduction(
            abuse,
            "rendezvous.finalfactory.at");

        Assert.Empty(errors);
    }

    [Fact]
    public void ProductionConfigurationRejectsUnsafeAndAmbiguousDefaults()
    {
        DeploymentOptions options = new()
        {
            SingleActiveInstance = false,
        };

        IReadOnlyList<string> errors = options.ValidateProduction(
            new AbuseProtectionOptions(),
            "*");

        Assert.Contains(errors, error => error.Contains("SingleActiveInstance", StringComparison.Ordinal));
        Assert.Contains(errors, error => error.Contains("PublicHttpBaseUrl", StringComparison.Ordinal));
        Assert.Contains(errors, error => error.Contains("PublicUdpHost", StringComparison.Ordinal));
        Assert.Contains(errors, error => error.Contains("TrustedProxyAddresses", StringComparison.Ordinal));
        Assert.Contains(errors, error => error.Contains("AllowedHosts", StringComparison.Ordinal));
    }

    [Theory]
    [InlineData("http://rendezvous.example.com/")]
    [InlineData("https://user@example.com/")]
    [InlineData("https://rendezvous.example.com/path")]
    [InlineData("https://localhost/")]
    [InlineData("https://10.0.0.1/")]
    [InlineData("https://192.0.2.10/")]
    [InlineData("https://[::ffff:10.0.0.1]/")]
    [InlineData("https://[ff02::1]/")]
    [InlineData("https://rendezvous.invalid/")]
    public void ProductionConfigurationRejectsUnsafeHttpEndpoint(string endpoint)
    {
        DeploymentOptions options = ValidOptions() with { PublicHttpBaseUrl = endpoint };

        IReadOnlyList<string> errors = options.ValidateProduction(
            new AbuseProtectionOptions { TrustedProxyAddresses = ["192.0.2.10"] },
            "rendezvous.finalfactory.at");

        Assert.Contains(errors, error => error.Contains("PublicHttpBaseUrl", StringComparison.Ordinal));
    }

    [Theory]
    [InlineData("0.1.2.3")]
    [InlineData("100.64.0.1")]
    [InlineData("192.0.2.1")]
    [InlineData("198.18.0.1")]
    [InlineData("198.51.100.1")]
    [InlineData("203.0.113.1")]
    [InlineData("224.0.0.1")]
    [InlineData("255.255.255.255")]
    [InlineData("::ffff:192.168.1.1")]
    [InlineData("2001:db8::1")]
    [InlineData("ff02::1")]
    [InlineData("rendezvous.example.com")]
    [InlineData("rendezvous.home.arpa")]
    [InlineData("rendezvous.alt")]
    [InlineData("service.test")]
    public void ProductionConfigurationRejectsNonPublicUdpEndpoint(string endpoint)
    {
        DeploymentOptions options = ValidOptions() with { PublicUdpHost = endpoint };

        IReadOnlyList<string> errors = options.ValidateProduction(
            new AbuseProtectionOptions { TrustedProxyAddresses = ["192.0.2.10"] },
            "rendezvous.finalfactory.at");

        Assert.Contains(errors, error => error.Contains("PublicUdpHost", StringComparison.Ordinal));
    }

    [Fact]
    public void IsolatedSmokeTestRequiresExplicitPrivateEndpointOverride()
    {
        DeploymentOptions options = ValidOptions() with
        {
            PublicHttpBaseUrl = "https://localhost/",
            PublicUdpHost = "127.0.0.1",
            AllowPrivatePublicEndpoints = true,
        };

        IReadOnlyList<string> errors = options.ValidateProduction(
            new AbuseProtectionOptions { TrustedProxyAddresses = ["127.0.0.1"] },
            "localhost");

        Assert.Empty(errors);
    }

    [Fact]
    public void ProductionConfigurationRejectsInvalidPortsDeadlinesAndMismatchedHostFilter()
    {
        DeploymentOptions options = ValidOptions() with
        {
            PublicUdpPort = 0,
            DrainDeadlineSeconds = 31,
            MinimumDrainSeconds = 6,
        };

        IReadOnlyList<string> errors = options.ValidateProduction(
            new AbuseProtectionOptions { TrustedProxyAddresses = ["192.0.2.10"] },
            "different.finalfactory.at");

        Assert.Contains(errors, error => error.Contains("PublicUdpPort", StringComparison.Ordinal));
        Assert.Contains(errors, error => error.Contains("DrainDeadlineSeconds", StringComparison.Ordinal));
        Assert.Contains(errors, error => error.Contains("MinimumDrainSeconds", StringComparison.Ordinal));
        Assert.Contains(errors, error => error.Contains("exact host", StringComparison.Ordinal));
    }

    private static DeploymentOptions ValidOptions() => new()
    {
        PublicHttpBaseUrl = "https://rendezvous.finalfactory.at/",
        PublicUdpHost = "rendezvous-udp.finalfactory.at",
        PublicUdpPort = 9050,
        DrainDeadlineSeconds = 10,
        MinimumDrainSeconds = 1,
        SingleActiveInstance = true,
    };
}