using EntKube.Provisioning.Domain;
using EntKube.Provisioning.Features.Apps.AddAppEnvironment;
using EntKube.Provisioning.Features.Apps.Reconcile;
using EntKube.Provisioning.Infrastructure;
using EntKube.SharedKernel.Domain;
using FluentAssertions;
using Moq;

namespace EntKube.Provisioning.Tests.Features;

public class AddAppEnvironmentHandlerTests
{
    private readonly AddAppEnvironmentHandler handler;
    private readonly InMemoryAppRepository repository;
    private readonly Mock<IKubernetesApplyClient> applyClientMock;

    public AddAppEnvironmentHandlerTests()
    {
        repository = new InMemoryAppRepository();
        applyClientMock = new Mock<IKubernetesApplyClient>();
        handler = new AddAppEnvironmentHandler(repository, applyClientMock.Object);
    }

    [Fact]
    public async Task HandleAsync_WithValidRequest_AddsEnvironmentToApp()
    {
        // Arrange — An app exists and the admin wants to add it to the dev environment.

        App app = App.Create(Guid.NewGuid(), Guid.NewGuid(), "API", "api", AppType.Deployment);
        await repository.AddAsync(app);

        Guid environmentId = Guid.NewGuid();
        Guid clusterId = Guid.NewGuid();

        AddAppEnvironmentRequest request = new(
            AppId: app.Id,
            EnvironmentId: environmentId,
            ClusterId: clusterId,
            Namespace: "api-dev");

        // Act

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

        // Assert — The environment is added and its ID returned.

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

        App? updated = await repository.GetByIdAsync(app.Id);
        updated!.Environments.Should().HaveCount(1);
        updated.Environments[0].EnvironmentId.Should().Be(environmentId);
        updated.Environments[0].ClusterId.Should().Be(clusterId);
        updated.Environments[0].Namespace.Should().Be("api-dev");

        // Verify that a namespace manifest was applied to the cluster.

        applyClientMock.Verify(
            c => c.ApplyManifestAsync(clusterId, It.Is<string>(y => y.Contains("kind: Namespace") && y.Contains("name: api-dev")), It.IsAny<CancellationToken>()),
            Times.Once);
    }

    [Fact]
    public async Task HandleAsync_WithNonExistentApp_ReturnsFailure()
    {
        // Arrange & Act

        AddAppEnvironmentRequest request = new(Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid(), "ns");
        Result<Guid> result = await handler.HandleAsync(request);

        // Assert

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

    [Fact]
    public async Task HandleAsync_WithDuplicateEnvironment_ReturnsFailure()
    {
        // Arrange — The app is already deployed to this environment.

        App app = App.Create(Guid.NewGuid(), Guid.NewGuid(), "API", "api", AppType.Deployment);
        Guid environmentId = Guid.NewGuid();
        app.AddEnvironment(environmentId, Guid.NewGuid(), "api-dev");
        await repository.AddAsync(app);

        AddAppEnvironmentRequest request = new(app.Id, environmentId, Guid.NewGuid(), "api-dev-2");

        // Act

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

        // Assert

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