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

/// <summary>
/// Tests for ClusterOptions default values and property setters.
/// </summary>
public class ClusterOptionsTests
{
    [Fact]
    public void DefaultValues_AreCorrect()
    {
        var options = new ClusterOptions();

        // 'auto-down' is the default posture (decision 2026-07-21): a crash of either
        // node fails over to the survivor; dual-active during a real partition is the
        // accepted trade for pairs with no shared lease infrastructure.
        Assert.Equal("auto-down", options.SplitBrainResolverStrategy);
        Assert.Equal(TimeSpan.FromSeconds(15), options.StableAfter);
        Assert.Equal(TimeSpan.FromSeconds(2), options.HeartbeatInterval);
        Assert.Equal(TimeSpan.FromSeconds(10), options.FailureDetectionThreshold);
        Assert.Equal(1, options.MinNrOfMembers);
        Assert.True(options.DownIfAlone);
    }

    [Fact]
    public void DownIfAlone_CanBeSet()
    {
        var options = new ClusterOptions { DownIfAlone = false };

        Assert.False(options.DownIfAlone);
    }

    [Fact]
    public void SeedNodes_DefaultsToEmptyList()
    {
        var options = new ClusterOptions();

        Assert.NotNull(options.SeedNodes);
        Assert.Empty(options.SeedNodes);
    }

    // ClusterInfra-011: SectionName constant deleted — the previous test
    // `SectionName_IsTheExpectedAppSettingsSection` is removed alongside it.
    // The Host's SiteServiceRegistration / StartupValidator continue to
    // reference the `"ScadaBridge:Cluster"` literal directly; reinstating the
    // constant should happen when those Host binding sites can be updated in
    // the same change.

    [Fact]
    public void Properties_CanBeSetToCustomValues()
    {
        // ClusterInfra-013: this test exercises the POCO property setters only —
        // `SplitBrainResolverStrategy = "keep-majority"` and `MinNrOfMembers = 2`
        // are values the design doc explicitly forbids in production
        // (`keep-majority` causes total shutdown on a two-node partition;
        // `MinNrOfMembers = 2` blocks the cluster singleton after failover).
        // The POCO accepts any value by design; rejection lives in
        // `ClusterOptionsValidator` and is covered by
        // `ClusterOptionsValidatorTests.UnsupportedSplitBrainStrategy_FailsValidation`
        // and `ClusterOptionsValidatorTests.MinNrOfMembers_NotOne_FailsValidation`.
        // Do NOT read these values as endorsed runtime configuration.
        var options = new ClusterOptions
        {
            SeedNodes = new List<string> { "akka.tcp://system@node1:2551", "akka.tcp://system@node2:2551" },
            SplitBrainResolverStrategy = "keep-majority",
            StableAfter = TimeSpan.FromSeconds(30),
            HeartbeatInterval = TimeSpan.FromSeconds(5),
            FailureDetectionThreshold = TimeSpan.FromSeconds(20),
            MinNrOfMembers = 2
        };

        Assert.Equal(2, options.SeedNodes.Count);
        Assert.Contains("akka.tcp://system@node1:2551", options.SeedNodes);
        Assert.Contains("akka.tcp://system@node2:2551", options.SeedNodes);
        Assert.Equal("keep-majority", options.SplitBrainResolverStrategy);
        Assert.Equal(TimeSpan.FromSeconds(30), options.StableAfter);
        Assert.Equal(TimeSpan.FromSeconds(5), options.HeartbeatInterval);
        Assert.Equal(TimeSpan.FromSeconds(20), options.FailureDetectionThreshold);
        Assert.Equal(2, options.MinNrOfMembers);
    }
}
