using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using StellaOps.Scanner.Analyzers.OS.Pkgutil;
using Xunit;

using StellaOps.TestKit;
namespace StellaOps.Scanner.Analyzers.OS.Pkgutil.Tests;

public sealed class PkgutilPackageAnalyzerTests
{
    private static readonly string FixturesRoot = Path.Combine(
        AppContext.BaseDirectory,
        "Fixtures");

    private readonly PkgutilPackageAnalyzer _analyzer;
    private readonly ILogger _logger;

    public PkgutilPackageAnalyzerTests()
    {
        _logger = NullLoggerFactory.Instance.CreateLogger<PkgutilPackageAnalyzer>();
        _analyzer = new PkgutilPackageAnalyzer((ILogger<PkgutilPackageAnalyzer>)_logger);
    }

    private OSPackageAnalyzerContext CreateContext(string rootPath)
    {
        return new OSPackageAnalyzerContext(
            rootPath,
            workspacePath: null,
            TimeProvider.System,
            _logger);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void AnalyzerId_ReturnsPkgutil()
    {
        Assert.Equal("pkgutil", _analyzer.AnalyzerId);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task AnalyzeAsync_WithValidReceipts_ReturnsPackages()
    {
        // Arrange
        var context = CreateContext(FixturesRoot);

        // Act
        var result = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);

        // Assert
        Assert.NotNull(result);
        Assert.Equal("pkgutil", result.AnalyzerId);
        Assert.True(result.Packages.Count > 0, "Expected at least one package");
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task AnalyzeAsync_FindsSafariPackage()
    {
        // Arrange
        var context = CreateContext(FixturesRoot);

        // Act
        var result = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);

        // Assert
        var safari = result.Packages.FirstOrDefault(p => p.Name == "Safari");
        Assert.NotNull(safari);
        Assert.Equal("17.1", safari.Version);
        Assert.Contains("pkg:generic/apple/com.apple.pkg.Safari@17.1", safari.PackageUrl);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task AnalyzeAsync_ExtractsVendorFromIdentifier()
    {
        // Arrange
        var context = CreateContext(FixturesRoot);

        // Act
        var result = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);

        // Assert
        var safari = result.Packages.FirstOrDefault(p => p.Name == "Safari");
        Assert.NotNull(safari);
        Assert.Equal("apple", safari.SourcePackage);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task AnalyzeAsync_SetsEvidenceSourceToPkgutilReceipt()
    {
        // Arrange
        var context = CreateContext(FixturesRoot);

        // Act
        var result = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);

        // Assert
        foreach (var package in result.Packages)
        {
            Assert.Equal(PackageEvidenceSource.PkgutilReceipt, package.EvidenceSource);
        }
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task AnalyzeAsync_ExtractsVendorMetadata()
    {
        // Arrange
        var context = CreateContext(FixturesRoot);

        // Act
        var result = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);

        // Assert
        var safari = result.Packages.FirstOrDefault(p => p.Name == "Safari");
        Assert.NotNull(safari);
        Assert.Equal("com.apple.pkg.Safari", safari.VendorMetadata["pkgutil:identifier"]);
        Assert.Equal("/", safari.VendorMetadata["pkgutil:volume"]);
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task AnalyzeAsync_ResultsAreDeterministicallySorted()
    {
        // Arrange
        var context = CreateContext(FixturesRoot);

        // Act
        var result1 = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);
        var result2 = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);

        // Assert
        Assert.Equal(result1.Packages.Count, result2.Packages.Count);
        for (int i = 0; i < result1.Packages.Count; i++)
        {
            Assert.Equal(result1.Packages[i].PackageUrl, result2.Packages[i].PackageUrl);
        }
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task AnalyzeAsync_NoReceiptsDirectory_ReturnsEmptyPackages()
    {
        // Arrange - use temp directory without receipts
        var tempPath = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
        Directory.CreateDirectory(tempPath);

        try
        {
            var context = CreateContext(tempPath);

            // Act
            var result = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);

            // Assert
            Assert.Empty(result.Packages);
        }
        finally
        {
            Directory.Delete(tempPath, recursive: true);
        }
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task AnalyzeAsync_PopulatesTelemetry()
    {
        // Arrange
        var context = CreateContext(FixturesRoot);

        // Act
        var result = await _analyzer.AnalyzeAsync(context, TestContext.Current.CancellationToken);

        // Assert
        Assert.NotNull(result.Telemetry);
        Assert.True(result.Telemetry.PackageCount > 0);
        Assert.True(result.Telemetry.Duration > TimeSpan.Zero);
    }
}