using Omika.Core.Observability.Diagnostic;

namespace Omika.Tests.Observability.Correlation;

public class CorrelationHeadersTests
{
    [Fact]
    public void Headers_HaveExpectedNames()
    {
        Assert.Equal("X-Omika-TraceId", CorrelationHeaders.TraceId);
        Assert.Equal("X-Omika-SessionId", CorrelationHeaders.SessionId);
    }

    [Fact]
    public void TryParseTraceId_ValidGuid_ReturnsTrue()
    {
        Guid guid = Guid.NewGuid();
        Assert.True(CorrelationHeaders.TryParseTraceId(guid.ToString("D"), out Guid parsed));
        Assert.Equal(guid, parsed);
    }

    [Theory]
    [InlineData("INVALID")]
    [InlineData("")]
    [InlineData("   ")]
    [InlineData("2ddc12ae")]
    [InlineData("not-a-guid")]
    [InlineData("2ddc12ae-4f1b-4c3a-zzzz-123456789012")]
    [InlineData(null)]
    public void TryParseTraceId_Invalid_ReturnsFalse(string? value)
    {
        Assert.False(CorrelationHeaders.TryParseTraceId(value, out _));
    }

    [Fact]
    public void TryParseSessionId_ValidGuid_ReturnsTrue()
    {
        Guid guid = Guid.NewGuid();
        Assert.True(CorrelationHeaders.TryParseSessionId(guid.ToString("D"), out Guid parsed));
        Assert.Equal(guid, parsed);
    }

    [Theory]
    [InlineData("INVALID")]
    [InlineData(null)]
    public void TryParseSessionId_Invalid_ReturnsFalse(string? value)
    {
        Assert.False(CorrelationHeaders.TryParseSessionId(value, out _));
    }
}