// <copyright file="ReplayableVerdictE2ETests.cs" company="Stella Operations">
// Copyright (c) Stella Operations. Licensed under AGPL-3.0-or-later.
// </copyright>

using System;
using System.IO;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using FluentAssertions;
using Xunit;

namespace StellaOps.E2E.ReplayableVerdict;

/// <summary>
/// E2E tests for reproducible verdict generation and replay
/// Sprint: SPRINT_20251229_004_005_E2E
/// </summary>
[Trait("Category", "E2E")]
[Trait("Category", "Determinism")]
public sealed class ReplayableVerdictE2ETests : IAsyncLifetime
{
    private const string BundlePath = "../../../fixtures/e2e/bundle-0001";
    private GoldenBundle? _bundle;

    public async Task InitializeAsync()
    {
        _bundle = await GoldenBundle.LoadAsync(BundlePath);
    }

    public Task DisposeAsync()
    {
        return Task.CompletedTask;
    }

    [Fact(Skip = "E2E-002: Requires full pipeline integration")]
    public async Task FullPipeline_ProducesConsistentVerdict()
    {
        // Arrange
        _bundle.Should().NotBeNull();

        // This test requires:
        // - Scanner service to process SBOM
        // - VexLens to compute consensus
        // - Verdict builder to generate final verdict
        // Currently skipped until services are integrated

        // Act
        // var scanResult = await Scanner.ScanAsync(_bundle.ImageDigest);
        // var vexConsensus = await VexLens.ComputeConsensusAsync(scanResult.SbomDigest, _bundle.FeedSnapshot);
        // var verdict = await VerdictBuilder.BuildAsync(evidencePack, _bundle.PolicyLock);

        // Assert
        // verdict.CgsHash.Should().Be(_bundle.ExpectedVerdictHash);
    }

    [Fact(Skip = "E2E-003: Requires verdict builder service")]
    public async Task ReplayFromBundle_ProducesIdenticalVerdict()
    {
        // Arrange
        _bundle.Should().NotBeNull();
        var originalVerdictHash = _bundle!.Manifest.ExpectedOutputs.VerdictHash;

        // Act
        // var replayedVerdict = await VerdictBuilder.ReplayAsync(_bundle.Manifest);

        // Assert
        // replayedVerdict.CgsHash.Should().Be(originalVerdictHash);
    }

    [Fact]
    public void Bundle_LoadsSuccessfully()
    {
        // Assert
        _bundle.Should().NotBeNull();
        _bundle!.Manifest.Should().NotBeNull();
        _bundle.Manifest.SchemaVersion.Should().Be("2.0");
        _bundle.Manifest.BundleId.Should().Be("bundle-0001");
    }

    [Fact]
    public void Bundle_HasValidInputs()
    {
        // Assert
        _bundle.Should().NotBeNull();
        _bundle!.Manifest.Inputs.Should().NotBeNull();
        _bundle.Manifest.Inputs.Sbom.Should().NotBeNull();
        _bundle.Manifest.Inputs.Feeds.Should().NotBeNull();
        _bundle.Manifest.Inputs.Vex.Should().NotBeNull();
        _bundle.Manifest.Inputs.Policy.Should().NotBeNull();
    }

    [Fact]
    public void Bundle_SbomFile_Exists()
    {
        // Arrange
        var sbomPath = Path.Combine(BundlePath, _bundle!.Manifest.Inputs.Sbom.Path);

        // Assert
        File.Exists(sbomPath).Should().BeTrue($"SBOM file should exist at {sbomPath}");
    }

    [Fact]
    public async Task Bundle_SbomFile_IsValidJson()
    {
        // Arrange
        var sbomPath = Path.Combine(BundlePath, _bundle!.Manifest.Inputs.Sbom.Path);
        var json = await File.ReadAllTextAsync(sbomPath);

        // Act
        var doc = JsonDocument.Parse(json);

        // Assert
        doc.RootElement.TryGetProperty("bomFormat", out var bomFormat).Should().BeTrue();
        bomFormat.GetString().Should().Be("CycloneDX");
        doc.RootElement.TryGetProperty("components", out var components).Should().BeTrue();
        components.GetArrayLength().Should().BeGreaterThan(0);
    }

    [Fact(Skip = "E2E-004: Requires verdict builder with delta support")]
    public async Task DeltaVerdict_ShowsExpectedChanges()
    {
        // This test requires two bundles (v1 and v2) to compare
        // var bundleV1 = await GoldenBundle.LoadAsync("../../../fixtures/e2e/bundle-0001");
        // var bundleV2 = await GoldenBundle.LoadAsync("../../../fixtures/e2e/bundle-0002");

        // var verdictV1 = await VerdictBuilder.BuildAsync(bundleV1.ToEvidencePack(), bundleV1.PolicyLock);
        // var verdictV2 = await VerdictBuilder.BuildAsync(bundleV2.ToEvidencePack(), bundleV2.PolicyLock);

        // var delta = await VerdictBuilder.DiffAsync(verdictV1.CgsHash, verdictV2.CgsHash);

        // delta.AddedVulns.Should().Contain("CVE-2024-NEW");
        // delta.RemovedVulns.Should().Contain("CVE-2024-FIXED");
    }

    [Fact(Skip = "E2E-005: Requires DSSE signing service")]
    public async Task Verdict_HasValidDsseSignature()
    {
        // var verdict = await VerdictBuilder.BuildAsync(_bundle.ToEvidencePack(), _bundle.PolicyLock);
        // var dsseEnvelope = await Signer.SignAsync(verdict);

        // var verificationResult = await Signer.VerifyAsync(dsseEnvelope, _bundle.PublicKey);

        // verificationResult.IsValid.Should().BeTrue();
        // verificationResult.SignedBy.Should().Be("test-keypair");
    }

    [Fact(Skip = "E2E-006: Requires network isolation support")]
    public async Task OfflineReplay_ProducesIdenticalVerdict()
    {
        // This test should run with network disabled
        // AssertNoNetworkCalls();

        // var verdict = await VerdictBuilder.ReplayAsync(_bundle.Manifest);

        // verdict.CgsHash.Should().Be(_bundle.ExpectedVerdictHash);
    }

    [Fact(Skip = "E2E-008: Requires cross-platform CI")]
    public async Task CrossPlatformReplay_ProducesIdenticalHash()
    {
        // This test runs on multiple CI runners (Ubuntu, Alpine, Debian)
        // var platform = Environment.OSVersion;

        // var verdict = await VerdictBuilder.BuildAsync(_bundle.ToEvidencePack(), _bundle.PolicyLock);

        // verdict.CgsHash.Should().Be(_bundle.ExpectedVerdictHash,
        //     $"verdict on {platform} should match golden hash");
    }
}

/// <summary>
/// Golden bundle loader
/// </summary>
internal sealed class GoldenBundle
{
    public required BundleManifest Manifest { get; init; }
    public required string BasePath { get; init; }

    public static async Task<GoldenBundle> LoadAsync(string path)
    {
        var manifestPath = Path.Combine(path, "manifest.json");
        if (!File.Exists(manifestPath))
        {
            throw new FileNotFoundException($"Bundle manifest not found: {manifestPath}");
        }

        var json = await File.ReadAllTextAsync(manifestPath);
        var manifest = JsonSerializer.Deserialize<BundleManifest>(json,
            new JsonSerializerOptions { PropertyNameCaseInsensitive = true })
            ?? throw new InvalidOperationException("Failed to deserialize manifest");

        return new GoldenBundle
        {
            Manifest = manifest,
            BasePath = path
        };
    }
}

/// <summary>
/// Bundle manifest schema (ReplayManifest v2)
/// </summary>
internal sealed record BundleManifest
{
    public required string SchemaVersion { get; init; }
    public required string BundleId { get; init; }
    public string? Description { get; init; }
    public required string CreatedAt { get; init; }
    public required ScanInfo Scan { get; init; }
    public required BundleInputs Inputs { get; init; }
    public required BundleOutputs ExpectedOutputs { get; init; }
    public string? Notes { get; init; }
}

internal sealed record ScanInfo
{
    public required string Id { get; init; }
    public required string ImageDigest { get; init; }
    public required string PolicyDigest { get; init; }
    public required string ScorePolicyDigest { get; init; }
    public required string FeedSnapshotDigest { get; init; }
    public required string Toolchain { get; init; }
    public required string AnalyzerSetDigest { get; init; }
}

internal sealed record BundleInputs
{
    public required InputFile Sbom { get; init; }
    public required InputFile Feeds { get; init; }
    public required InputFile Vex { get; init; }
    public required InputFile Policy { get; init; }
}

internal sealed record InputFile
{
    public required string Path { get; init; }
    public required string Sha256 { get; init; }
}

internal sealed record BundleOutputs
{
    public required InputFile Verdict { get; init; }
    public required string VerdictHash { get; init; }
}