using System.Collections.Immutable;
using StellaOps.Graph.Indexer.Schema;

namespace StellaOps.Graph.Indexer.Tests;

public sealed class GraphIdentityTests
{
    [Fact]
    public void ComputeNodeId_IsDeterministic_WhenTupleOrderChanges()
    {
        var tupleA = ImmutableDictionary<string, string>.Empty
            .Add("purl", "pkg:npm/test@1.0.0")
            .Add("reason", "declared")
            .Add("scope", "runtime");

        var tupleB = ImmutableDictionary<string, string>.Empty
            .Add("scope", "runtime")
            .Add("reason", "declared")
            .Add("purl", "pkg:npm/test@1.0.0");

        var idA = GraphIdentity.ComputeNodeId("Tenant-A", "Component", tupleA);
        var idB = GraphIdentity.ComputeNodeId("tenant-a", "component", tupleB);

        Assert.Equal(idA, idB);
        Assert.StartsWith("gn:tenant-a:component:", idA);
    }

    [Fact]
    public void ComputeEdgeId_IsCaseInsensitiveExceptFingerprintFields()
    {
        var tupleLower = ImmutableDictionary<string, string>.Empty
            .Add("digest", "sha256:ABC")
            .Add("source", "sbom");

        var tupleUpper = ImmutableDictionary<string, string>.Empty
            .Add("digest", "sha256:abc")
            .Add("source", "SBOM");

        var edgeA = GraphIdentity.ComputeEdgeId("TENANT", "depends_on", tupleLower);
        var edgeB = GraphIdentity.ComputeEdgeId("tenant", "DEPENDS_ON", tupleUpper);

        // digest key is case-sensitive by design; different casing produces different id when value changes.
        Assert.NotEqual(edgeA, edgeB);
        Assert.StartsWith("ge:tenant:DEPENDS_ON:", edgeA);
    }
}