using EntKube.Clusters.Domain;
using EntKube.Clusters.Features.AdoptCluster;
using EntKube.Clusters.Infrastructure;
using EntKube.SharedKernel.Domain;
using FluentAssertions;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;

namespace EntKube.Clusters.Tests.Features;

public class AdoptClusterHandlerTests
{
    private readonly InMemoryClusterRepository repository;
    private readonly Mock<IAdoptionCheck> kyvernoCheck;
    private readonly Mock<IAdoptionCheck> securityPoliciesCheck;
    private readonly AdoptClusterHandler handler;

    public AdoptClusterHandlerTests()
    {
        repository = new InMemoryClusterRepository();
        kyvernoCheck = new Mock<IAdoptionCheck>();
        securityPoliciesCheck = new Mock<IAdoptionCheck>();

        kyvernoCheck.Setup(c => c.ComponentName).Returns("kyverno");
        securityPoliciesCheck.Setup(c => c.ComponentName).Returns("security-policies");

        List<IAdoptionCheck> checks = new() { kyvernoCheck.Object, securityPoliciesCheck.Object };
        handler = new AdoptClusterHandler(repository, checks, NullLogger<AdoptClusterHandler>.Instance);
    }

    [Fact]
    public async Task HandleAsync_ClusterNotFound_ReturnsFailure()
    {
        // Arrange — Attempt to adopt a cluster that doesn't exist.

        Guid unknownId = Guid.NewGuid();

        // Act

        Result<AdoptionReport> result = await handler.HandleAsync(unknownId);

        // Assert

        result.IsFailure.Should().BeTrue();
        result.Error.Should().Contain("not found");
    }

    [Fact]
    public async Task HandleAsync_ClusterNotConnected_ReturnsFailure()
    {
        // Arrange — The cluster exists but is still Pending (not yet reachable).

        KubernetesCluster cluster = KubernetesCluster.Register(
            "dev-cluster", "https://k8s.dev:6443", "kubeconfig-data", Guid.NewGuid(), "dev-ctx", Guid.NewGuid());
        await repository.AddAsync(cluster);

        // Act

        Result<AdoptionReport> result = await handler.HandleAsync(cluster.Id);

        // Assert

        result.IsFailure.Should().BeTrue();
        result.Error.Should().Contain("connected");
    }

    [Fact]
    public async Task HandleAsync_AllComponentsInstalled_ReturnsReadyReport()
    {
        // Arrange — A connected cluster where all components report Installed.

        KubernetesCluster cluster = KubernetesCluster.Register(
            "prod-cluster", "https://k8s.prod:6443", "kubeconfig-data", Guid.NewGuid(), "prod-ctx", Guid.NewGuid());
        cluster.MarkConnected();
        await repository.AddAsync(cluster);

        kyvernoCheck.Setup(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new ComponentCheckResult("kyverno", ComponentStatus.Installed,
                new List<string> { "Pod running: kyverno-admission-controller-0" },
                new List<string>()));

        securityPoliciesCheck.Setup(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new ComponentCheckResult("security-policies", ComponentStatus.Installed,
                new List<string> { "Policy present: deny-loadbalancer-services" },
                new List<string>()));

        // Act

        Result<AdoptionReport> result = await handler.HandleAsync(cluster.Id);

        // Assert — All components installed means Ready.

        result.IsSuccess.Should().BeTrue();
        result.Value!.Status.Should().Be(AdoptionReadiness.Ready);
        result.Value.Components.Should().HaveCount(2);
        result.Value.Components.Should().AllSatisfy(c => c.Status.Should().Be(ComponentStatus.Installed));
    }

    [Fact]
    public async Task HandleAsync_OneComponentNotInstalled_ReturnsNotReady()
    {
        // Arrange — Kyverno is missing entirely while policies exist (impossible
        // in practice, but tests the aggregation logic).

        KubernetesCluster cluster = KubernetesCluster.Register(
            "bare-cluster", "https://k8s.bare:6443", "kubeconfig-data", Guid.NewGuid(), "bare-ctx", Guid.NewGuid());
        cluster.MarkConnected();
        await repository.AddAsync(cluster);

        kyvernoCheck.Setup(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new ComponentCheckResult("kyverno", ComponentStatus.NotInstalled,
                new List<string>(),
                new List<string> { "No Kyverno pods found" }));

        securityPoliciesCheck.Setup(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new ComponentCheckResult("security-policies", ComponentStatus.NotInstalled,
                new List<string>(),
                new List<string> { "restrict-image-registries", "deny-loadbalancer-services" }));

        // Act

        Result<AdoptionReport> result = await handler.HandleAsync(cluster.Id);

        // Assert — Any component NotInstalled means the cluster is NotReady.

        result.IsSuccess.Should().BeTrue();
        result.Value!.Status.Should().Be(AdoptionReadiness.NotReady);
    }

    [Fact]
    public async Task HandleAsync_OneComponentDegraded_ReturnsPartiallyReady()
    {
        // Arrange — Kyverno is installed but security policies are only partially deployed.

        KubernetesCluster cluster = KubernetesCluster.Register(
            "partial-cluster", "https://k8s.partial:6443", "kubeconfig-data", Guid.NewGuid(), "partial-ctx", Guid.NewGuid());
        cluster.MarkConnected();
        await repository.AddAsync(cluster);

        kyvernoCheck.Setup(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new ComponentCheckResult("kyverno", ComponentStatus.Installed,
                new List<string> { "Pod running: kyverno-admission-controller-0" },
                new List<string>()));

        securityPoliciesCheck.Setup(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new ComponentCheckResult("security-policies", ComponentStatus.Degraded,
                new List<string> { "Policy present: deny-loadbalancer-services" },
                new List<string> { "restrict-image-registries", "require-seccomp-runtime-default" }));

        // Act

        Result<AdoptionReport> result = await handler.HandleAsync(cluster.Id);

        // Assert — Degraded components mean PartiallyReady.

        result.IsSuccess.Should().BeTrue();
        result.Value!.Status.Should().Be(AdoptionReadiness.PartiallyReady);
    }

    [Fact]
    public async Task HandleAsync_RunsAllChecksInParallel()
    {
        // Arrange — Verify that both checks are called for a connected cluster.

        KubernetesCluster cluster = KubernetesCluster.Register(
            "test-cluster", "https://k8s.test:6443", "kubeconfig-data", Guid.NewGuid(), "test-ctx", Guid.NewGuid());
        cluster.MarkConnected();
        await repository.AddAsync(cluster);

        kyvernoCheck.Setup(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new ComponentCheckResult("kyverno", ComponentStatus.Installed, new List<string>(), new List<string>()));

        securityPoliciesCheck.Setup(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()))
            .ReturnsAsync(new ComponentCheckResult("security-policies", ComponentStatus.Installed, new List<string>(), new List<string>()));

        // Act

        await handler.HandleAsync(cluster.Id);

        // Assert — Both checks were invoked.

        kyvernoCheck.Verify(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()), Times.Once);
        securityPoliciesCheck.Verify(c => c.CheckAsync(cluster, It.IsAny<CancellationToken>()), Times.Once);
    }
}