using EntKube.Provisioning.Domain;
using FluentAssertions;

namespace EntKube.Provisioning.Tests.Domain;

/// <summary>
/// Tests for the MinioInstance aggregate. This tracks adopted MinIO deployments
/// that the platform uses as backup targets for CNPG clusters.
/// </summary>
public class MinioInstanceTests
{
    [Fact]
    public void Adopt_WithValidInputs_CreatesInstanceInRunningState()
    {
        // Arrange & Act — Adopt an existing MinIO deployment discovered on the cluster.

        Guid clusterId = Guid.NewGuid();

        MinioInstance minio = MinioInstance.Adopt(
            clusterId: clusterId,
            name: "platform-minio",
            ns: "minio-system",
            endpoint: "minio.minio-system.svc:9000",
            consoleEndpoint: "minio-console.minio-system.svc:9001",
            credentialsSecret: "minio-root-credentials",
            totalCapacity: "500Gi",
            usedCapacity: "120Gi",
            buckets: new List<string> { "cnpg-backups", "loki-logs", "velero" });

        // Assert — Adopted instances are already running.

        minio.Id.Should().NotBe(Guid.Empty);
        minio.ClusterId.Should().Be(clusterId);
        minio.Name.Should().Be("platform-minio");
        minio.Namespace.Should().Be("minio-system");
        minio.Endpoint.Should().Be("minio.minio-system.svc:9000");
        minio.ConsoleEndpoint.Should().Be("minio-console.minio-system.svc:9001");
        minio.CredentialsSecret.Should().Be("minio-root-credentials");
        minio.Status.Should().Be(MinioInstanceStatus.Running);
        minio.Buckets.Should().HaveCount(3);
        minio.Buckets.Should().Contain("cnpg-backups");
    }

    [Fact]
    public void Adopt_WithEmptyName_ThrowsArgumentException()
    {
        // Arrange & Act

        Action act = () => MinioInstance.Adopt(
            Guid.NewGuid(), "", "ns", "endpoint:9000", null,
            "secret", "500Gi", null, null);

        // Assert

        act.Should().Throw<ArgumentException>().WithParameterName("name");
    }

    [Fact]
    public void Adopt_WithEmptyEndpoint_ThrowsArgumentException()
    {
        // Arrange & Act

        Action act = () => MinioInstance.Adopt(
            Guid.NewGuid(), "minio", "ns", "", null,
            "secret", "500Gi", null, null);

        // Assert

        act.Should().Throw<ArgumentException>().WithParameterName("endpoint");
    }

    [Fact]
    public void Adopt_WithEmptyCredentials_ThrowsArgumentException()
    {
        // Arrange & Act

        Action act = () => MinioInstance.Adopt(
            Guid.NewGuid(), "minio", "ns", "endpoint:9000", null,
            "", "500Gi", null, null);

        // Assert

        act.Should().Throw<ArgumentException>().WithParameterName("credentialsSecret");
    }

    [Fact]
    public void CreateBucket_WhenRunning_AddsBucketToList()
    {
        // Arrange — A running MinIO instance.

        MinioInstance minio = CreateTestInstance();

        // Act — CNPG provisioning requests a new bucket for WAL storage.

        EntKube.SharedKernel.Domain.Result<string> result = minio.CreateBucket("new-pg-backups");

        // Assert

        result.IsSuccess.Should().BeTrue();
        minio.Buckets.Should().Contain("new-pg-backups");
    }

    [Fact]
    public void CreateBucket_DuplicateName_ReturnsFailure()
    {
        // Arrange

        MinioInstance minio = MinioInstance.Adopt(
            Guid.NewGuid(), "minio", "ns", "minio:9000", null,
            "secret", "500Gi", null,
            new List<string> { "existing-bucket" });

        // Act

        EntKube.SharedKernel.Domain.Result<string> result = minio.CreateBucket("existing-bucket");

        // Assert

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

    [Fact]
    public void CreateBucket_WhenDegraded_ReturnsFailure()
    {
        // Arrange — A degraded MinIO can't serve new bucket requests.

        MinioInstance minio = CreateTestInstance();
        minio.MarkDegraded("Storage pool full");

        // Act

        EntKube.SharedKernel.Domain.Result<string> result = minio.CreateBucket("new-bucket");

        // Assert

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

    [Fact]
    public void MarkDegraded_SetsStatusAndMessage()
    {
        // Arrange

        MinioInstance minio = CreateTestInstance();

        // Act

        minio.MarkDegraded("Drive offline");

        // Assert

        minio.Status.Should().Be(MinioInstanceStatus.Degraded);
        minio.StatusMessage.Should().Be("Drive offline");
    }

    [Fact]
    public void MarkRunning_ClearsDegradedStatus()
    {
        // Arrange — A previously degraded instance recovers.

        MinioInstance minio = CreateTestInstance();
        minio.MarkDegraded("Temporary issue");

        // Act

        minio.MarkRunning();

        // Assert

        minio.Status.Should().Be(MinioInstanceStatus.Running);
        minio.StatusMessage.Should().BeNull();
    }

    [Fact]
    public void GetBackupCredentials_ReturnsEndpointAndSecret()
    {
        // Arrange — CNPG needs to know where to send backups.

        MinioInstance minio = MinioInstance.Adopt(
            Guid.NewGuid(), "minio", "minio-system", "minio.minio-system.svc:9000", null,
            "minio-root-credentials", "1Ti", null, null);

        // Act

        MinioBackupTarget target = minio.GetBackupTarget("cnpg-backups");

        // Assert

        target.Endpoint.Should().Be("minio.minio-system.svc:9000");
        target.Bucket.Should().Be("cnpg-backups");
        target.CredentialsSecret.Should().Be("minio-root-credentials");
    }

    private static MinioInstance CreateTestInstance()
    {
        return MinioInstance.Adopt(
            Guid.NewGuid(), "platform-minio", "minio-system",
            "minio.minio-system.svc:9000", "minio-console:9001",
            "minio-root-credentials", "500Gi", "120Gi",
            new List<string> { "cnpg-backups" });
    }
}