using FluentAssertions;
using Microsoft.Extensions.Logging.Abstractions;
using Xunit;

using StellaOps.TestKit;
namespace StellaOps.Cryptography.PluginLoader.Tests;

public class CryptoPluginLoaderTests
{
    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void Constructor_WithNullConfiguration_ThrowsArgumentNullException()
    {
        // Arrange & Act
        Action act = () => new CryptoPluginLoader(null!, NullLogger<CryptoPluginLoader>.Instance);

        // Assert
        act.Should().Throw<ArgumentNullException>()
            .WithParameterName("configuration");
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void LoadProviders_WithEmptyEnabledList_ReturnsEmptyCollection()
    {
        // Arrange
        var configuration = new CryptoPluginConfiguration
        {
            ManifestPath = CreateTestManifest(),
            DiscoveryMode = "explicit",
            Enabled = new List<EnabledPluginEntry>(),
            RequireAtLeastOne = false
        };

        var loader = new CryptoPluginLoader(configuration, NullLogger<CryptoPluginLoader>.Instance);

        // Act
        var providers = loader.LoadProviders();

        // Assert
        providers.Should().BeEmpty();
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void LoadProviders_WithMissingManifest_ThrowsFileNotFoundException()
    {
        // Arrange
        var configuration = new CryptoPluginConfiguration
        {
            ManifestPath = "/nonexistent/path/manifest.json",
            DiscoveryMode = "explicit"
        };

        var loader = new CryptoPluginLoader(configuration, NullLogger<CryptoPluginLoader>.Instance);

        // Act
        Action act = () => loader.LoadProviders();

        // Assert
        act.Should().Throw<FileNotFoundException>()
            .WithMessage("*manifest.json*");
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void LoadProviders_WithRequireAtLeastOneAndNoProviders_ThrowsCryptoPluginLoadException()
    {
        // Arrange
        var configuration = new CryptoPluginConfiguration
        {
            ManifestPath = CreateTestManifest(),
            DiscoveryMode = "explicit",
            Enabled = new List<EnabledPluginEntry>(),
            RequireAtLeastOne = true
        };

        var loader = new CryptoPluginLoader(configuration, NullLogger<CryptoPluginLoader>.Instance);

        // Act
        Action act = () => loader.LoadProviders();

        // Assert
        act.Should().Throw<CryptoPluginLoadException>()
            .WithMessage("*at least one provider*");
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void LoadProviders_WithDisabledPattern_FiltersMatchingPlugins()
    {
        // Arrange
        var configuration = new CryptoPluginConfiguration
        {
            ManifestPath = CreateTestManifest(),
            DiscoveryMode = "auto",
            Disabled = new List<string> { "test.*" },
            RequireAtLeastOne = false
        };

        var loader = new CryptoPluginLoader(configuration, NullLogger<CryptoPluginLoader>.Instance);

        // Act
        var providers = loader.LoadProviders();

        // Assert
        providers.Should().NotContain(p => p.Name.StartsWith("test.", StringComparison.OrdinalIgnoreCase));
    }

    private static string CreateTestManifest()
    {
        var tempPath = Path.Combine(Path.GetTempPath(), $"test-manifest-{Guid.NewGuid()}.json");
        var manifestContent = @"{
  ""version"": ""1.0"",
  ""plugins"": []
}";
        File.WriteAllText(tempPath, manifestContent);
        return tempPath;
    }
}

public class CryptoPluginConfigurationTests
{
    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void Constructor_SetsDefaultValues()
    {
        // Arrange & Act
        var config = new CryptoPluginConfiguration();

        // Assert
        config.ManifestPath.Should().Be("/etc/stellaops/crypto-plugins-manifest.json");
        config.DiscoveryMode.Should().Be("explicit");
        config.FailOnMissingPlugin.Should().BeTrue();
        config.RequireAtLeastOne.Should().BeTrue();
        config.Enabled.Should().NotBeNull().And.BeEmpty();
        config.Disabled.Should().NotBeNull().And.BeEmpty();
    }
}

public class CryptoPluginManifestTests
{
    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public void CryptoPluginDescriptor_WithRequiredProperties_IsValid()
    {
        // Arrange & Act
        var descriptor = new CryptoPluginDescriptor
        {
            Id = "test",
            Name = "TestProvider",
            Assembly = "Test.dll",
            Type = "Test.TestProvider"
        };

        // Assert
        descriptor.Id.Should().Be("test");
        descriptor.Name.Should().Be("TestProvider");
        descriptor.Assembly.Should().Be("Test.dll");
        descriptor.Type.Should().Be("Test.TestProvider");
        descriptor.Priority.Should().Be(50); // Default priority
        descriptor.EnabledByDefault.Should().BeTrue();
    }
}