using StellaOps.Concelier.BackportProof.Models;
using Xunit;

namespace StellaOps.Concelier.BackportProof.Tests;

/// <summary>
/// Tests for PackageEcosystem enum.
/// </summary>
public sealed class PackageEcosystemTests
{
    [Theory]
    [InlineData(PackageEcosystem.Deb)]
    [InlineData(PackageEcosystem.Rpm)]
    [InlineData(PackageEcosystem.Apk)]
    [InlineData(PackageEcosystem.Unknown)]
    public void PackageEcosystem_AllValues_AreDefined(PackageEcosystem ecosystem)
    {
        Assert.True(Enum.IsDefined(ecosystem));
    }

    [Fact]
    public void PackageEcosystem_AllValues_AreCounted()
    {
        var values = Enum.GetValues<PackageEcosystem>();
        Assert.Equal(4, values.Length);
    }
}

/// <summary>
/// Tests for ProductContext record.
/// </summary>
public sealed class ProductContextTests
{
    [Fact]
    public void ProductContext_RequiredProperties_MustBeSet()
    {
        var context = new ProductContext(
            Distro: "debian",
            Release: "bookworm",
            RepoScope: "main",
            Architecture: "amd64");

        Assert.Equal("debian", context.Distro);
        Assert.Equal("bookworm", context.Release);
        Assert.Equal("main", context.RepoScope);
        Assert.Equal("amd64", context.Architecture);
    }

    [Fact]
    public void ProductContext_OptionalProperties_CanBeNull()
    {
        var context = new ProductContext(
            Distro: "alpine",
            Release: "3.19",
            RepoScope: null,
            Architecture: null);

        Assert.Null(context.RepoScope);
        Assert.Null(context.Architecture);
    }

    [Fact]
    public void ProductContext_RecordEquality_WorksCorrectly()
    {
        var c1 = new ProductContext("rhel", "9", "main", "x86_64");
        var c2 = new ProductContext("rhel", "9", "main", "x86_64");

        Assert.Equal(c1, c2);
    }
}

/// <summary>
/// Tests for PackageKey record.
/// </summary>
public sealed class PackageKeyTests
{
    [Fact]
    public void PackageKey_RequiredProperties_MustBeSet()
    {
        var key = new PackageKey(
            Ecosystem: PackageEcosystem.Deb,
            PackageName: "nginx",
            SourcePackageName: "nginx");

        Assert.Equal(PackageEcosystem.Deb, key.Ecosystem);
        Assert.Equal("nginx", key.PackageName);
        Assert.Equal("nginx", key.SourcePackageName);
    }

    [Fact]
    public void PackageKey_SourcePackage_CanBeNull()
    {
        var key = new PackageKey(
            Ecosystem: PackageEcosystem.Rpm,
            PackageName: "httpd",
            SourcePackageName: null);

        Assert.Null(key.SourcePackageName);
    }
}

/// <summary>
/// Tests for EvidenceTier enum.
/// </summary>
public sealed class EvidenceTierTests
{
    [Theory]
    [InlineData(EvidenceTier.Unknown, 0)]
    [InlineData(EvidenceTier.NvdRange, 5)]
    [InlineData(EvidenceTier.UpstreamCommit, 4)]
    [InlineData(EvidenceTier.SourcePatch, 3)]
    [InlineData(EvidenceTier.Changelog, 2)]
    [InlineData(EvidenceTier.DistroOval, 1)]
    public void EvidenceTier_Values_HaveCorrectNumericValue(EvidenceTier tier, int expected)
    {
        Assert.Equal(expected, (int)tier);
    }

    [Fact]
    public void EvidenceTier_DistroOval_IsHighestConfidence()
    {
        // Tier 1 is highest confidence (lowest numeric value)
        var allTiers = Enum.GetValues<EvidenceTier>().Where(t => t != EvidenceTier.Unknown);
        var highestConfidence = allTiers.OrderBy(t => (int)t).First();

        Assert.Equal(EvidenceTier.DistroOval, highestConfidence);
    }

    [Fact]
    public void EvidenceTier_NvdRange_IsLowestConfidence()
    {
        // Tier 5 is lowest confidence (highest numeric value)
        var allTiers = Enum.GetValues<EvidenceTier>().Where(t => t != EvidenceTier.Unknown);
        var lowestConfidence = allTiers.OrderByDescending(t => (int)t).First();

        Assert.Equal(EvidenceTier.NvdRange, lowestConfidence);
    }
}

/// <summary>
/// Tests for FixStatus enum.
/// </summary>
public sealed class FixStatusTests
{
    [Theory]
    [InlineData(FixStatus.Patched)]
    [InlineData(FixStatus.Vulnerable)]
    [InlineData(FixStatus.NotAffected)]
    [InlineData(FixStatus.WontFix)]
    [InlineData(FixStatus.UnderInvestigation)]
    [InlineData(FixStatus.Unknown)]
    public void FixStatus_AllValues_AreDefined(FixStatus status)
    {
        Assert.True(Enum.IsDefined(status));
    }

    [Fact]
    public void FixStatus_AllValues_AreCounted()
    {
        var values = Enum.GetValues<FixStatus>();
        Assert.Equal(6, values.Length);
    }
}

/// <summary>
/// Tests for RulePriority enum.
/// </summary>
public sealed class RulePriorityTests
{
    [Fact]
    public void RulePriority_DistroNativeOval_IsHighestPriority()
    {
        var allPriorities = Enum.GetValues<RulePriority>();
        var highest = allPriorities.Max(p => (int)p);

        Assert.Equal((int)RulePriority.DistroNativeOval, highest);
        Assert.Equal(100, highest);
    }

    [Fact]
    public void RulePriority_NvdRangeHeuristic_IsLowestPriority()
    {
        var allPriorities = Enum.GetValues<RulePriority>();
        var lowest = allPriorities.Min(p => (int)p);

        Assert.Equal((int)RulePriority.NvdRangeHeuristic, lowest);
        Assert.Equal(20, lowest);
    }

    [Fact]
    public void RulePriority_LegacyAliases_MatchNewValues()
    {
        Assert.Equal(RulePriority.DistroNativeOval, RulePriority.DistroNative);
        Assert.Equal(RulePriority.ChangelogExplicitCve, RulePriority.VendorCsaf);
        Assert.Equal(RulePriority.NvdRangeHeuristic, RulePriority.ThirdParty);
    }

    [Theory]
    [InlineData(RulePriority.NvdRangeHeuristic, 20)]
    [InlineData(RulePriority.UpstreamCommitPartialMatch, 45)]
    [InlineData(RulePriority.UpstreamCommitExactParity, 55)]
    [InlineData(RulePriority.SourcePatchFuzzyMatch, 60)]
    [InlineData(RulePriority.SourcePatchExactMatch, 70)]
    [InlineData(RulePriority.ChangelogBugIdMapped, 75)]
    [InlineData(RulePriority.ChangelogExplicitCve, 85)]
    [InlineData(RulePriority.DerivativeOvalMedium, 90)]
    [InlineData(RulePriority.DerivativeOvalHigh, 95)]
    [InlineData(RulePriority.DistroNativeOval, 100)]
    public void RulePriority_Values_HaveCorrectNumericValue(RulePriority priority, int expected)
    {
        Assert.Equal(expected, (int)priority);
    }
}

/// <summary>
/// Tests for EvidencePointer record.
/// </summary>
public sealed class EvidencePointerTests
{
    [Fact]
    public void EvidencePointer_RequiredProperties_MustBeSet()
    {
        var fetchedAt = DateTimeOffset.UtcNow;

        var pointer = new EvidencePointer(
            SourceType: "debian-tracker",
            SourceUrl: "https://security-tracker.debian.org/tracker/CVE-2024-0001",
            SourceDigest: "sha256:abc123",
            FetchedAt: fetchedAt,
            TierSource: EvidenceTier.DistroOval);

        Assert.Equal("debian-tracker", pointer.SourceType);
        Assert.Equal("https://security-tracker.debian.org/tracker/CVE-2024-0001", pointer.SourceUrl);
        Assert.Equal("sha256:abc123", pointer.SourceDigest);
        Assert.Equal(fetchedAt, pointer.FetchedAt);
        Assert.Equal(EvidenceTier.DistroOval, pointer.TierSource);
    }

    [Fact]
    public void EvidencePointer_TierSource_DefaultsToUnknown()
    {
        var pointer = new EvidencePointer(
            SourceType: "nvd",
            SourceUrl: "https://nvd.nist.gov/vuln/detail/CVE-2024-0001",
            SourceDigest: null,
            FetchedAt: DateTimeOffset.UtcNow);

        Assert.Equal(EvidenceTier.Unknown, pointer.TierSource);
    }
}

/// <summary>
/// Tests for VersionRange record.
/// </summary>
public sealed class VersionRangeTests
{
    [Fact]
    public void VersionRange_FullRange_ContainsAllBoundaries()
    {
        var range = new VersionRange(
            MinVersion: "1.0.0",
            MinInclusive: true,
            MaxVersion: "2.0.0",
            MaxInclusive: false);

        Assert.Equal("1.0.0", range.MinVersion);
        Assert.True(range.MinInclusive);
        Assert.Equal("2.0.0", range.MaxVersion);
        Assert.False(range.MaxInclusive);
    }

    [Fact]
    public void VersionRange_OpenEnded_AllowsNullBoundaries()
    {
        // All versions up to 2.0.0 (exclusive)
        var range = new VersionRange(
            MinVersion: null,
            MinInclusive: false,
            MaxVersion: "2.0.0",
            MaxInclusive: false);

        Assert.Null(range.MinVersion);
        Assert.Equal("2.0.0", range.MaxVersion);
    }
}