using EntKube.Clusters.Domain;
using EntKube.Clusters.Features.AdoptCluster;
using EntKube.Clusters.Features.AdoptCluster.UninstallComponent;
using EntKube.Clusters.Infrastructure;
using EntKube.SharedKernel.Domain;
using FluentAssertions;
using Moq;

namespace EntKube.Clusters.Tests.Features;

public class UninstallComponentHandlerTests
{
    private readonly InMemoryClusterRepository repository;
    private readonly Mock<IComponentInstaller> kyvernoInstaller;
    private readonly Mock<IComponentInstaller> monitoringInstaller;
    private readonly UninstallComponentHandler handler;

    public UninstallComponentHandlerTests()
    {
        repository = new InMemoryClusterRepository();
        kyvernoInstaller = new Mock<IComponentInstaller>();
        monitoringInstaller = new Mock<IComponentInstaller>();

        kyvernoInstaller.Setup(i => i.ComponentName).Returns("kyverno");
        monitoringInstaller.Setup(i => i.ComponentName).Returns("monitoring");

        List<IComponentInstaller> installers = new() { kyvernoInstaller.Object, monitoringInstaller.Object };
        handler = new UninstallComponentHandler(repository, installers, Microsoft.Extensions.Logging.Abstractions.NullLogger<UninstallComponentHandler>.Instance);
    }

    [Fact]
    public async Task HandleAsync_ClusterNotFound_ReturnsFailure()
    {
        // Arrange — request an uninstall on a cluster that doesn't exist.

        UninstallComponentRequest request = new("kyverno");

        // Act

        Result<InstallResult> result = await handler.HandleAsync(Guid.NewGuid(), request);

        // Assert

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

    [Fact]
    public async Task HandleAsync_ClusterNotConnected_ReturnsFailure()
    {
        // Arrange — Cluster is Pending, can't uninstall from it.

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

        UninstallComponentRequest request = new("kyverno");

        // Act

        Result<InstallResult> result = await handler.HandleAsync(cluster.Id, request);

        // Assert

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

    [Fact]
    public async Task HandleAsync_UnknownComponent_ReturnsFailureWithAvailable()
    {
        // Arrange — Requesting an uninstall for a component that has no installer.

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

        UninstallComponentRequest request = new("nonexistent-thing");

        // Act

        Result<InstallResult> result = await handler.HandleAsync(cluster.Id, request);

        // Assert — Should list available installers.

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

    [Fact]
    public async Task HandleAsync_ValidComponent_DelegatesToInstallerUninstall()
    {
        // Arrange — Uninstall Kyverno from a connected cluster.

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

        kyvernoInstaller.Setup(i => i.UninstallAsync(cluster, It.IsAny<ComponentInstallOptions>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new InstallResult(
                Success: true,
                ComponentName: "kyverno",
                Message: "Kyverno uninstalled successfully",
                Actions: new List<string> { "Helm uninstall kyverno" }));

        UninstallComponentRequest request = new("kyverno");

        // Act

        Result<InstallResult> result = await handler.HandleAsync(cluster.Id, request);

        // Assert — Should succeed and return the uninstall result.

        result.IsSuccess.Should().BeTrue();
        result.Value!.Success.Should().BeTrue();
        result.Value.ComponentName.Should().Be("kyverno");
        result.Value.Actions.Should().Contain("Helm uninstall kyverno");
    }

    [Fact]
    public async Task HandleAsync_InstallerFails_ReturnsFailure()
    {
        // Arrange — The uninstall encounters an error.

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

        kyvernoInstaller.Setup(i => i.UninstallAsync(cluster, It.IsAny<ComponentInstallOptions>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new InstallResult(
                Success: false,
                ComponentName: "kyverno",
                Message: "Helm uninstall failed: resources still in use",
                Actions: new List<string> { "Error: resources still in use" }));

        UninstallComponentRequest request = new("kyverno");

        // Act

        Result<InstallResult> result = await handler.HandleAsync(cluster.Id, request);

        // Assert

        result.IsFailure.Should().BeTrue();
        result.Error.Should().Contain("resources still in use");
    }

    [Fact]
    public async Task HandleAsync_PassesOptionsToInstaller()
    {
        // Arrange — Uninstall monitoring with a custom namespace.

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

        ComponentInstallOptions? capturedOptions = null;

        monitoringInstaller.Setup(i => i.UninstallAsync(cluster, It.IsAny<ComponentInstallOptions>(), It.IsAny<CancellationToken>()))
            .Callback<KubernetesCluster, ComponentInstallOptions, CancellationToken>((_, opts, _) => capturedOptions = opts)
            .ReturnsAsync(new InstallResult(
                Success: true,
                ComponentName: "monitoring",
                Message: "Monitoring uninstalled",
                Actions: new List<string>()));

        UninstallComponentRequest request = new("monitoring", Namespace: "custom-monitoring");

        // Act

        Result<InstallResult> result = await handler.HandleAsync(cluster.Id, request);

        // Assert — The handler should forward the namespace to the installer.

        result.IsSuccess.Should().BeTrue();
        capturedOptions.Should().NotBeNull();
        capturedOptions!.Namespace.Should().Be("custom-monitoring");
    }

    [Fact]
    public async Task HandleAsync_ComponentNameIsCaseInsensitive()
    {
        // Arrange — Use mixed case for the component name.

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

        kyvernoInstaller.Setup(i => i.UninstallAsync(cluster, It.IsAny<ComponentInstallOptions>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new InstallResult(
                Success: true,
                ComponentName: "kyverno",
                Message: "Uninstalled",
                Actions: new List<string>()));

        UninstallComponentRequest request = new("Kyverno");

        // Act

        Result<InstallResult> result = await handler.HandleAsync(cluster.Id, request);

        // Assert

        result.IsSuccess.Should().BeTrue();
    }
}