using EntKube.Clusters.Domain;
using EntKube.Clusters.Features.RegisterCluster;
using EntKube.Clusters.Infrastructure;
using EntKube.SharedKernel.Domain;
using FluentAssertions;

namespace EntKube.Clusters.Tests.Features;

public class RegisterClusterHandlerTests
{
    private readonly RegisterClusterHandler handler;
    private readonly InMemoryClusterRepository repository;

    public RegisterClusterHandlerTests()
    {
        repository = new InMemoryClusterRepository();
        handler = new RegisterClusterHandler(repository);
    }

    [Fact]
    public async Task HandleAsync_WithValidRequest_ReturnsSuccessWithClusterId()
    {
        // Arrange — A valid registration request with all required fields
        // including the tenant and kubeconfig.

        Guid tenantId = Guid.NewGuid();
        Guid environmentId = Guid.NewGuid();
        RegisterClusterRequest request = new("production-eu", "https://k8s.example.com:6443", "apiVersion: v1\nkind: Config", tenantId, "prod-context", environmentId);

        // Act

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

        // Assert — The handler should succeed and the cluster should be persisted with tenant link.

        result.IsSuccess.Should().BeTrue();
        result.Value.Should().NotBe(Guid.Empty);

        KubernetesCluster? persisted = await repository.GetByIdAsync(result.Value!);
        persisted.Should().NotBeNull();
        persisted!.Name.Should().Be("production-eu");
        persisted.TenantId.Should().Be(tenantId);
        persisted.KubeConfig.Should().Contain("apiVersion");
        persisted.ContextName.Should().Be("prod-context");
    }

    [Fact]
    public async Task HandleAsync_WithEmptyName_ReturnsFailure()
    {
        // Arrange — Missing cluster name.

        RegisterClusterRequest request = new("", "https://k8s.example.com:6443", "kubeconfig-data", Guid.NewGuid(), "ctx", Guid.NewGuid());

        // Act

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

        // Assert

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

    [Fact]
    public async Task HandleAsync_WithEmptyApiUrl_ReturnsFailure()
    {
        // Arrange — Missing API server URL.

        RegisterClusterRequest request = new("my-cluster", "", "kubeconfig-data", Guid.NewGuid(), "ctx", Guid.NewGuid());

        // Act

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

        // Assert

        result.IsFailure.Should().BeTrue();
        result.Error.Should().Contain("API server URL");
    }

    [Fact]
    public async Task HandleAsync_WithEmptyKubeConfig_ReturnsFailure()
    {
        // Arrange — Missing kubeconfig content. A cluster cannot be registered
        // without credentials to access it.

        RegisterClusterRequest request = new("my-cluster", "https://k8s.example.com:6443", "", Guid.NewGuid(), "ctx", Guid.NewGuid());

        // Act

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

        // Assert

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

    [Fact]
    public async Task HandleAsync_WithEmptyTenantId_ReturnsFailure()
    {
        // Arrange — No tenant specified. Every cluster must belong to a tenant.

        RegisterClusterRequest request = new("my-cluster", "https://k8s.example.com:6443", "kubeconfig-data", Guid.Empty, "ctx", Guid.NewGuid());

        // Act

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

        // Assert

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

    [Fact]
    public async Task HandleAsync_WithEmptyEnvironmentId_ReturnsFailure()
    {
        // Arrange — No environment specified. Every cluster must belong to an environment.

        RegisterClusterRequest request = new("my-cluster", "https://k8s.example.com:6443", "kubeconfig-data", Guid.NewGuid(), "ctx", Guid.Empty);

        // Act

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

        // Assert

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