using Omika.Core.Observability;

namespace Omika.Tests.Observability;

public class TelemetryMetadataTests
{
    [Fact]
    public void Create_RetainsValidEntries()
    {
        TelemetryMetadata metadata = TelemetryMetadata.Create(("count", 42), ("ok", true));

        Assert.Equal(2, metadata.Count);
    }

    [Fact]
    public void Create_DropsNullKey()
    {
        TelemetryMetadata metadata = TelemetryMetadata.Create((null!, 42));

        Assert.Equal(0, metadata.Count);
    }

    [Fact]
    public void Create_DropsWhitespaceKey()
    {
        TelemetryMetadata metadata = TelemetryMetadata.Create(("   ", 42));

        Assert.Equal(0, metadata.Count);
    }

    [Fact]
    public void Create_DropsInvalidValue()
    {
        TelemetryMetadata metadata = TelemetryMetadata.Create(("bad", TelemetryValue.Invalid));

        Assert.Equal(0, metadata.Count);
    }

    [Fact]
    public void Create_DeduplicatesByKey_FirstWins()
    {
        TelemetryMetadata metadata = TelemetryMetadata.Create(("k", 1), ("k", 2));

        Assert.Equal(1, metadata.Count);
        Assert.Equal(1, (int)metadata.Entries[0].Value.Value!);
    }

    [Fact]
    public void Create_Empty_ReturnsEmpty()
    {
        Assert.Same(TelemetryMetadata.Empty, TelemetryMetadata.Create());
    }

    [Fact]
    public void Create_Null_ReturnsEmpty()
    {
        Assert.Same(TelemetryMetadata.Empty, TelemetryMetadata.Create((IEnumerable<KeyValuePair<string, TelemetryValue>>)null!));
    }
}