# frozen_string_literal: true

require 'spec_helper'

describe Projects::Serverless::FunctionsController do
  include KubernetesHelpers
  include ReactiveCachingHelpers

  let(:user) { create(:user) }
  let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
  let(:service) { cluster.platform_kubernetes }
  let(:project) { cluster.project }
  let(:environment) { create(:environment, project: project) }
  let!(:deployment) { create(:deployment, :success, environment: environment, cluster: cluster) }
  let(:knative_services_finder) { environment.knative_services_finder }
  let(:function_description) { 'A serverless function' }
  let(:knative_stub_options) do
    { namespace: namespace.namespace, name: cluster.project.name, description: function_description }
  end

  let(:namespace) do
    create(:cluster_kubernetes_namespace,
      cluster: cluster,
      cluster_project: cluster.cluster_project,
      project: cluster.cluster_project.project,
      environment: environment)
  end

  before do
    project.add_maintainer(user)
    sign_in(user)
  end

  def params(opts = {})
    opts.reverse_merge(namespace_id: project.namespace.to_param,
                       project_id: project.to_param)
  end

  describe 'GET #index' do
    let(:expected_json) { { 'knative_installed' => knative_state, 'functions' => functions } }

    context 'when cache is being read' do
      let(:knative_state) { 'checking' }
      let(:functions) { [] }

      before do
        get :index, params: params({ format: :json })
      end

      it 'returns checking' do
        expect(json_response).to eq expected_json
      end

      it { expect(response).to have_gitlab_http_status(200) }
    end

    context 'when cache is ready' do
      let(:knative_state) { true }

      before do
        allow(Clusters::KnativeServicesFinder)
          .to receive(:new)
          .and_return(knative_services_finder)
        synchronous_reactive_cache(knative_services_finder)
        stub_kubeclient_service_pods(
          kube_response({ "kind" => "PodList", "items" => [] }),
          namespace: namespace.namespace
        )
      end

      context 'when no functions were found' do
        let(:functions) { [] }

        before do
          stub_kubeclient_knative_services(
            namespace: namespace.namespace,
            response: kube_response({ "kind" => "ServiceList", "items" => [] })
          )
          get :index, params: params({ format: :json })
        end

        it 'returns checking' do
          expect(json_response).to eq expected_json
        end

        it { expect(response).to have_gitlab_http_status(200) }
      end

      context 'when functions were found' do
        let(:functions) { ["asdf"] }

        before do
          stub_kubeclient_knative_services(namespace: namespace.namespace)
          get :index, params: params({ format: :json })
        end

        it 'returns functions' do
          expect(json_response["functions"]).not_to be_empty
        end

        it { expect(response).to have_gitlab_http_status(200) }
      end
    end
  end

  describe 'GET #show' do
    context 'invalid data' do
      it 'has a bad function name' do
        get :show, params: params({ format: :json, environment_id: "*", id: "foo" })
        expect(response).to have_gitlab_http_status(404)
      end
    end

    context 'with valid data', :use_clean_rails_memory_store_caching do
      shared_examples 'GET #show with valid data' do
        it 'has a valid function name' do
          get :show, params: params({ format: :json, environment_id: "*", id: cluster.project.name })
          expect(response).to have_gitlab_http_status(200)

          expect(json_response).to include(
            'name' => project.name,
            'url' => "http://#{project.name}.#{namespace.namespace}.example.com",
            'description' => function_description,
            'podcount' => 1
          )
        end
      end

      context 'on Knative 0.5.0' do
        before do
          prepare_knative_stubs(knative_05_service(knative_stub_options))
        end

        include_examples 'GET #show with valid data'
      end

      context 'on Knative 0.6.0' do
        before do
          prepare_knative_stubs(knative_06_service(knative_stub_options))
        end

        include_examples 'GET #show with valid data'
      end

      context 'on Knative 0.7.0' do
        before do
          prepare_knative_stubs(knative_07_service(knative_stub_options))
        end

        include_examples 'GET #show with valid data'
      end
    end
  end

  describe 'GET #metrics' do
    context 'invalid data' do
      it 'has a bad function name' do
        get :metrics, params: params({ format: :json, environment_id: "*", id: "foo" })
        expect(response).to have_gitlab_http_status(204)
      end
    end
  end

  describe 'GET #index with data', :use_clean_rails_memory_store_caching do
    shared_examples 'GET #index with data' do
      it 'has data' do
        get :index, params: params({ format: :json })

        expect(response).to have_gitlab_http_status(200)

        expect(json_response).to match({
                                         'knative_installed' => 'checking',
                                         'functions' => [
                                           a_hash_including(
                                             'name' => project.name,
                                             'url' => "http://#{project.name}.#{namespace.namespace}.example.com",
                                             'description' => function_description
                                           )
                                         ]
                                       })
      end

      it 'has data in html' do
        get :index, params: params

        expect(response).to have_gitlab_http_status(200)
      end
    end

    context 'on Knative 0.5.0' do
      before do
        prepare_knative_stubs(knative_05_service(knative_stub_options))
      end

      include_examples 'GET #index with data'
    end

    context 'on Knative 0.6.0' do
      before do
        prepare_knative_stubs(knative_06_service(knative_stub_options))
      end

      include_examples 'GET #index with data'
    end

    context 'on Knative 0.7.0' do
      before do
        prepare_knative_stubs(knative_07_service(knative_stub_options))
      end

      include_examples 'GET #index with data'
    end
  end

  def prepare_knative_stubs(knative_service)
    stub_kubeclient_service_pods
    stub_reactive_cache(knative_services_finder,
                        {
                          services: [knative_service],
                          pods: kube_knative_pods_body(cluster.project.name, namespace.namespace)["items"]
                        },
                        *knative_services_finder.cache_args)
  end
end