using Xunit;

namespace StellaOps.HybridLogicalClock.Tests;

public partial class HlcTimestampTests
{
    [Fact]
    public void CompareTo_SamePhysicalTimeAndCounter_SortsLexicographicallyByNodeId()
    {
        var nodeA = new HlcTimestamp
        {
            PhysicalTime = BasePhysicalTime,
            NodeId = "node-a",
            LogicalCounter = 0
        };
        var nodeB = new HlcTimestamp
        {
            PhysicalTime = BasePhysicalTime,
            NodeId = "node-b",
            LogicalCounter = 0
        };

        Assert.True(nodeA.CompareTo(nodeB) < 0);
        Assert.True(nodeB.CompareTo(nodeA) > 0);
    }

    [Fact]
    public void CompareTo_IdenticalTimestamps_ReturnsZero()
    {
        var ts1 = new HlcTimestamp
        {
            PhysicalTime = BasePhysicalTime,
            NodeId = TestNodeId,
            LogicalCounter = 42
        };
        var ts2 = new HlcTimestamp
        {
            PhysicalTime = BasePhysicalTime,
            NodeId = TestNodeId,
            LogicalCounter = 42
        };

        Assert.Equal(0, ts1.CompareTo(ts2));
    }

    [Fact]
    public void CompareTo_TotalOrdering_IsTransitive()
    {
        var a = new HlcTimestamp { PhysicalTime = 100, NodeId = "node", LogicalCounter = 0 };
        var b = new HlcTimestamp { PhysicalTime = 100, NodeId = "node", LogicalCounter = 1 };
        var c = new HlcTimestamp { PhysicalTime = 100, NodeId = "node", LogicalCounter = 2 };

        Assert.True(a < b);
        Assert.True(b < c);
        Assert.True(a < c);
    }
}