using System.Text.Json.Nodes;
using StellaOps.Findings.Ledger.Domain;
using StellaOps.Findings.Ledger.Hashing;
using Xunit;

namespace StellaOps.Findings.Ledger.Tests;

public sealed class ProjectionHashingTests
{
    [Fact]
    public void ComputeCycleHash_IncludesRiskFields()
    {
        var projection = CreateProjection(riskScore: 5.5m, riskSeverity: "high");
        var hashWithRisk = ProjectionHashing.ComputeCycleHash(projection);

        var changedRisk = projection with { RiskScore = 4.0m };
        var hashChangedRisk = ProjectionHashing.ComputeCycleHash(changedRisk);

        Assert.NotEqual(hashWithRisk, hashChangedRisk);
    }

    [Fact]
    public void ComputeCycleHash_ChangesWhenRiskExplanationChanges()
    {
        var projection = CreateProjection(riskExplanationId: Guid.NewGuid());
        var hashWithExplanation = ProjectionHashing.ComputeCycleHash(projection);

        var projectionDifferent = projection with { RiskExplanationId = Guid.NewGuid() };
        var hashWithDifferentExplanation = ProjectionHashing.ComputeCycleHash(projectionDifferent);

        Assert.NotEqual(hashWithExplanation, hashWithDifferentExplanation);
    }

    private static FindingProjection CreateProjection(decimal? riskScore = null, string? riskSeverity = null, Guid? riskExplanationId = null)
    {
        return new FindingProjection(
            TenantId: "t1",
            FindingId: "f1",
            PolicyVersion: "v1",
            Status: "affected",
            Severity: 7.5m,
            RiskScore: riskScore,
            RiskSeverity: riskSeverity,
            RiskProfileVersion: "profile-1",
            RiskExplanationId: riskExplanationId,
            RiskEventSequence: 1,
            Labels: new JsonObject { ["k"] = "v" },
            CurrentEventId: Guid.NewGuid(),
            ExplainRef: "ref",
            PolicyRationale: new JsonArray("r1"),
            UpdatedAt: DateTimeOffset.UtcNow,
            CycleHash: string.Empty);
    }
}