require 'rails_helper'

describe DeploymentPlatform do
  let(:project) { create(:project) }

  describe '#deployment_platform' do
    subject { project.deployment_platform }

    context 'with no Kubernetes configuration on CI/CD, no Kubernetes Service and a Kubernetes template configured' do
      let!(:kubernetes_service) { create(:kubernetes_service, template: true) }

      it 'returns a platform kubernetes' do
        expect(subject).to be_a_kind_of(Clusters::Platforms::Kubernetes)
      end

      it 'creates a cluster and a platform kubernetes' do
        expect { subject }
          .to change { Clusters::Cluster.count }.by(1)
          .and change { Clusters::Platforms::Kubernetes.count }.by(1)
      end

      it 'includes appropriate attributes for Cluster' do
        cluster = subject.cluster
        expect(cluster.name).to eq('kubernetes-template')
        expect(cluster.project).to eq(project)
        expect(cluster.provider_type).to eq('user')
        expect(cluster.platform_type).to eq('kubernetes')
      end

      it 'creates a platform kubernetes' do
        expect { subject }.to change { Clusters::Platforms::Kubernetes.count }.by(1)
      end

      it 'copies attributes from Clusters::Platform::Kubernetes template into the new Cluster::Platforms::Kubernetes' do
        expect(subject.api_url).to eq(kubernetes_service.api_url)
        expect(subject.ca_pem).to eq(kubernetes_service.ca_pem)
        expect(subject.token).to eq(kubernetes_service.token)
        expect(subject.namespace).to eq(kubernetes_service.namespace)
      end
    end

    context 'with no Kubernetes configuration on CI/CD, no Kubernetes Service and no Kubernetes template configured' do
      it { is_expected.to be_nil }
    end

    context 'when project has configured kubernetes from CI/CD > Clusters' do
      let!(:cluster) { create(:cluster, :provided_by_gcp, projects: [project]) }
      let(:platform_kubernetes) { cluster.platform_kubernetes }

      it 'returns the Kubernetes platform' do
        expect(subject).to eq(platform_kubernetes)
      end

      context 'with a group level kubernetes cluster' do
        let(:group_cluster) { create(:cluster, :provided_by_gcp, :group) }

        before do
          project.update!(group: group_cluster.group)
        end

        it 'returns the Kubernetes platform from the project cluster' do
          expect(subject).to eq(platform_kubernetes)
        end
      end
    end

    context 'when group has configured kubernetes cluster' do
      let!(:group_cluster) { create(:cluster, :provided_by_gcp, :group) }
      let(:group) { group_cluster.group }

      before do
        project.update!(group: group)
      end

      it 'returns the Kubernetes platform' do
        is_expected.to eq(group_cluster.platform_kubernetes)
      end

      context 'when child group has configured kubernetes cluster', :nested_groups do
        let!(:child_group1_cluster) { create(:cluster, :provided_by_gcp, :group) }
        let(:child_group1) { child_group1_cluster.group }

        before do
          project.update!(group: child_group1)
          child_group1.update!(parent: group)
        end

        it 'returns the Kubernetes platform for the child group' do
          is_expected.to eq(child_group1_cluster.platform_kubernetes)
        end

        context 'deeply nested group' do
          let!(:child_group2_cluster) { create(:cluster, :provided_by_gcp, :group) }
          let(:child_group2) { child_group2_cluster.group }

          before do
            child_group2.update!(parent: child_group1)
            project.update!(group: child_group2)
          end

          it 'returns most nested group cluster Kubernetes platform' do
            is_expected.to eq(child_group2_cluster.platform_kubernetes)
          end

          context 'cluster in the middle of hierarchy is disabled' do
            before do
              child_group2_cluster.update!(enabled: false)
            end

            it 'returns closest enabled Kubenetes platform' do
              is_expected.to eq(child_group1_cluster.platform_kubernetes)
            end
          end
        end
      end

      context 'feature flag disabled' do
        before do
          stub_feature_flags(group_clusters: false)
        end

        it 'returns nil' do
          is_expected.to be_nil
        end
      end
    end

    context 'when user configured kubernetes integration from project services' do
      let!(:kubernetes_service) { create(:kubernetes_service, project: project) }

      it 'returns the Kubernetes service' do
        expect(subject).to eq(kubernetes_service)
      end
    end

    context 'when the cluster creation fails' do
      let!(:kubernetes_service) { create(:kubernetes_service, template: true) }

      before do
        allow_any_instance_of(Clusters::Cluster).to receive(:persisted?).and_return(false)
      end

      it { is_expected.to be_nil }
    end
  end
end