using EntKube.Provisioning.Domain;
using EntKube.Provisioning.Features.MinioTenants;
using EntKube.Provisioning.Features.MinioTenants.AdoptMinioTenants;
using EntKube.Provisioning.Infrastructure;
using EntKube.SharedKernel.Domain;
using FluentAssertions;
using Moq;

namespace EntKube.Provisioning.Tests.Features;

/// <summary>
/// Tests for MinIO Tenant adoption — discovering existing MinIO Tenant CRDs on a
/// Kubernetes cluster and importing them into the platform's domain so they can be
/// viewed, managed, and monitored. This follows the same pattern as CNPG cluster
/// adoption: the Provisioning service scans the cluster, finds what's already running,
/// and creates domain aggregates for each tenant.
/// </summary>
public class MinioTenantAdoptionTests
{
    private readonly InMemoryMinioTenantRepository tenantRepository;
    private readonly Mock<IMinioTenantClient> tenantClient;

    public MinioTenantAdoptionTests()
    {
        tenantRepository = new InMemoryMinioTenantRepository();
        tenantClient = new Mock<IMinioTenantClient>();
    }

    // ─── Adopt Tenants ──────────────────────────────────────────────────────────

    [Fact]
    public async Task AdoptTenants_WithExistingTenants_ImportsThemAsRunning()
    {
        // Arrange — The Kubernetes cluster has two MinIO tenants already running:
        // one for platform storage and one for application data. Neither of them
        // exists in our repository yet, so adoption should discover and import both.

        Guid clusterId = Guid.NewGuid();

        tenantClient.Setup(c => c.DiscoverTenantsAsync(
            It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new List<DiscoveredMinioTenant>
            {
                new(
                    Name: "platform-storage",
                    Namespace: "minio-platform",
                    Pools: new List<DiscoveredMinioPool>
                    {
                        new(Servers: 4, VolumesPerServer: 4, StorageSize: "100Gi", StorageClass: "ceph-block")
                    },
                    CurrentState: "Initialized",
                    Buckets: new List<string> { "cnpg-backups", "loki-logs" }),
                new(
                    Name: "app-storage",
                    Namespace: "minio-apps",
                    Pools: new List<DiscoveredMinioPool>
                    {
                        new(Servers: 2, VolumesPerServer: 4, StorageSize: "50Gi", StorageClass: "standard")
                    },
                    CurrentState: "Initialized",
                    Buckets: new List<string> { "user-uploads" })
            });

        AdoptMinioTenantsHandler handler = new(tenantRepository, tenantClient.Object);

        AdoptMinioTenantsRequest request = new(
            ClusterId: clusterId,
            KubeConfig: "kubeconfig-content",
            ContextName: "prod-context");

        // Act

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

        // Assert — Both tenants adopted with correct details.

        result.IsSuccess.Should().BeTrue();
        result.Value.Should().HaveCount(2);

        IReadOnlyList<MinioTenant> all = await tenantRepository.GetAllAsync();
        all.Should().HaveCount(2);

        MinioTenant platformTenant = all.First(t => t.Name == "platform-storage");
        platformTenant.ClusterId.Should().Be(clusterId);
        platformTenant.Namespace.Should().Be("minio-platform");
        platformTenant.Status.Should().Be(MinioTenantStatus.Running);
        platformTenant.Pools.Should().HaveCount(1);
        platformTenant.Pools[0].Servers.Should().Be(4);
        platformTenant.Pools[0].StorageSize.Should().Be("100Gi");

        MinioTenant appTenant = all.First(t => t.Name == "app-storage");
        appTenant.Status.Should().Be(MinioTenantStatus.Running);
    }

    [Fact]
    public async Task AdoptTenants_NoTenantsOnCluster_ReturnsEmptyList()
    {
        // Arrange — The MinIO operator is installed but no tenants are deployed yet.

        tenantClient.Setup(c => c.DiscoverTenantsAsync(
            It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new List<DiscoveredMinioTenant>());

        AdoptMinioTenantsHandler handler = new(tenantRepository, tenantClient.Object);

        AdoptMinioTenantsRequest request = new(Guid.NewGuid(), "config", "ctx");

        // Act

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

        // Assert — Success with empty list, not a failure.

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

    [Fact]
    public async Task AdoptTenants_AlreadyAdopted_DoesNotDuplicate()
    {
        // Arrange — One tenant was already adopted. Running adoption again should
        // skip it and only import new tenants, not create duplicates.

        Guid clusterId = Guid.NewGuid();

        MinioTenant existing = MinioTenant.Adopt(
            clusterId: clusterId,
            name: "platform-storage",
            ns: "minio-platform",
            pools: new List<MinioTenantPool>
            {
                new(4, 4, "100Gi", "ceph-block")
            });

        await tenantRepository.AddAsync(existing);

        tenantClient.Setup(c => c.DiscoverTenantsAsync(
            It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new List<DiscoveredMinioTenant>
            {
                new(
                    Name: "platform-storage",
                    Namespace: "minio-platform",
                    Pools: new List<DiscoveredMinioPool>
                    {
                        new(Servers: 4, VolumesPerServer: 4, StorageSize: "100Gi", StorageClass: "ceph-block")
                    },
                    CurrentState: "Initialized",
                    Buckets: new List<string> { "cnpg-backups" }),
                new(
                    Name: "new-tenant",
                    Namespace: "minio-new",
                    Pools: new List<DiscoveredMinioPool>
                    {
                        new(Servers: 2, VolumesPerServer: 2, StorageSize: "50Gi", StorageClass: "standard")
                    },
                    CurrentState: "Initialized",
                    Buckets: new List<string>())
            });

        AdoptMinioTenantsHandler handler = new(tenantRepository, tenantClient.Object);

        AdoptMinioTenantsRequest request = new(clusterId, "config", "ctx");

        // Act

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

        // Assert — Only one new tenant adopted, the existing one was skipped.

        result.IsSuccess.Should().BeTrue();
        result.Value.Should().HaveCount(2);

        IReadOnlyList<MinioTenant> all = await tenantRepository.GetAllAsync();
        all.Should().HaveCount(2);
    }

    [Fact]
    public async Task AdoptTenants_DegradedTenant_MarkedDegraded()
    {
        // Arrange — A tenant with state "Decommissioning" or some non-healthy
        // state should be imported but marked as Degraded, not Running.

        tenantClient.Setup(c => c.DiscoverTenantsAsync(
            It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new List<DiscoveredMinioTenant>
            {
                new(
                    Name: "sick-tenant",
                    Namespace: "minio-sick",
                    Pools: new List<DiscoveredMinioPool>
                    {
                        new(Servers: 4, VolumesPerServer: 4, StorageSize: "100Gi", StorageClass: "standard")
                    },
                    CurrentState: "Decommissioning",
                    Buckets: new List<string>())
            });

        AdoptMinioTenantsHandler handler = new(tenantRepository, tenantClient.Object);

        AdoptMinioTenantsRequest request = new(Guid.NewGuid(), "config", "ctx");

        // Act

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

        // Assert

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

        IReadOnlyList<MinioTenant> all = await tenantRepository.GetAllAsync();
        all[0].Status.Should().Be(MinioTenantStatus.Degraded);
    }

    // ─── Domain: MinioTenant.Adopt ──────────────────────────────────────────────

    [Fact]
    public void Adopt_WithValidConfig_CreatesRunningTenant()
    {
        // Arrange — We discover a healthy tenant with known pools.

        List<MinioTenantPool> pools = new()
        {
            new(Servers: 4, VolumesPerServer: 4, StorageSize: "100Gi", StorageClass: "ceph-block")
        };

        // Act

        MinioTenant tenant = MinioTenant.Adopt(
            clusterId: Guid.NewGuid(),
            name: "discovered-tenant",
            ns: "minio-discovered",
            pools: pools);

        // Assert — Adopted tenants start as Running since they're already serving traffic.

        tenant.Id.Should().NotBe(Guid.Empty);
        tenant.Name.Should().Be("discovered-tenant");
        tenant.Namespace.Should().Be("minio-discovered");
        tenant.Status.Should().Be(MinioTenantStatus.Running);
        tenant.Pools.Should().HaveCount(1);
        tenant.Pools[0].Servers.Should().Be(4);
    }

    [Fact]
    public void Adopt_WithEmptyName_Throws()
    {
        // A tenant with no name is not valid — discovery must provide a name.

        Action act = () => MinioTenant.Adopt(
            Guid.NewGuid(), "", "ns",
            new List<MinioTenantPool> { new(1, 1, "10Gi", "standard") });

        act.Should().Throw<ArgumentException>();
    }
}