# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Projects::LogsController do
  include KubernetesHelpers

  let_it_be(:user) { create(:user) }
  let_it_be(:project) { create(:project) }

  let_it_be(:environment) do
    create(:environment, name: 'production', project: project)
  end

  let(:pod_name) { "foo" }
  let(:container) { 'container-1' }

  before do
    sign_in(user)
  end

  describe 'GET #index' do
    let(:empty_project) { create(:project) }

    it 'returns 404 with reporter access' do
      project.add_reporter(user)

      get :index, params: environment_params

      expect(response).to have_gitlab_http_status(:not_found)
    end

    it 'renders empty logs page if no environment exists' do
      empty_project.add_developer(user)

      get :index, params: { namespace_id: empty_project.namespace, project_id: empty_project }

      expect(response).to be_ok
      expect(response).to render_template 'empty_logs'
    end

    it 'renders index template' do
      project.add_developer(user)

      get :index, params: environment_params

      expect(response).to be_ok
      expect(response).to render_template 'index'
    end
  end

  shared_examples 'pod logs service' do |endpoint, service|
    let(:service_result) do
      {
        status: :success,
        logs: ['Log 1', 'Log 2', 'Log 3'],
        pods: [pod_name],
        pod_name: pod_name,
        container_name: container
      }
    end

    let(:service_result_json) { Gitlab::Json.parse(service_result.to_json) }

    let_it_be(:cluster) { create(:cluster, :provided_by_gcp, environment_scope: '*', projects: [project]) }

    before do
      allow_next_instance_of(service) do |instance|
        allow(instance).to receive(:execute).and_return(service_result)
      end
    end

    it 'returns 404 with reporter access' do
      project.add_reporter(user)

      get endpoint, params: environment_params(pod_name: pod_name, format: :json)

      expect(response).to have_gitlab_http_status(:not_found)
    end

    context 'with developer access' do
      before do
        project.add_developer(user)
      end

      it 'returns the service result' do
        get endpoint, params: environment_params(pod_name: pod_name, format: :json)

        expect(response).to have_gitlab_http_status(:success)
        expect(json_response).to eq(service_result_json)
      end
    end

    context 'with maintainer access' do
      before do
        project.add_maintainer(user)
      end

      it 'returns the service result' do
        get endpoint, params: environment_params(pod_name: pod_name, format: :json)

        expect(response).to have_gitlab_http_status(:success)
        expect(json_response).to eq(service_result_json)
      end

      it 'registers a usage of the endpoint' do
        expect(::Gitlab::UsageCounters::PodLogs).to receive(:increment).with(project.id)

        get endpoint, params: environment_params(pod_name: pod_name, format: :json)

        expect(response).to have_gitlab_http_status(:success)
      end

      it 'sets the polling header' do
        get endpoint, params: environment_params(pod_name: pod_name, format: :json)

        expect(response).to have_gitlab_http_status(:success)
        expect(response.headers['Poll-Interval']).to eq('3000')
      end

      context 'with gitlab managed apps logs' do
        it 'uses cluster finder services to select cluster', :aggregate_failures do
          cluster_list = [cluster]
          service_params = { params: ActionController::Parameters.new(pod_name: pod_name).permit! }
          request_params = {
            namespace_id: project.namespace,
            project_id: project,
            cluster_id: cluster.id,
            pod_name: pod_name,
            format: :json
          }

          expect_next_instance_of(ClusterAncestorsFinder, project, user) do |finder|
            expect(finder).to receive(:execute).and_return(cluster_list)
            expect(cluster_list).to receive(:find).and_call_original
          end

          expect_next_instance_of(service, cluster, Gitlab::Kubernetes::Helm::NAMESPACE, service_params) do |instance|
            expect(instance).to receive(:execute).and_return(service_result)
          end

          get endpoint, params: request_params

          expect(response).to have_gitlab_http_status(:success)
          expect(json_response).to eq(service_result_json)
        end
      end

      context 'when service is processing' do
        let(:service_result) { nil }

        it 'returns a 202' do
          get endpoint, params: environment_params(pod_name: pod_name, format: :json)

          expect(response).to have_gitlab_http_status(:accepted)
        end
      end

      shared_examples 'unsuccessful execution response' do |message|
        let(:service_result) do
          {
            status: :error,
            message: message
          }
        end

        it 'returns the error' do
          get endpoint, params: environment_params(pod_name: pod_name, format: :json)

          expect(response).to have_gitlab_http_status(:bad_request)
          expect(json_response).to eq(service_result_json)
        end
      end

      context 'when service is failing' do
        it_behaves_like 'unsuccessful execution response', 'some error'
      end

      context 'when cluster is nil' do
        let!(:cluster) { nil }

        it_behaves_like 'unsuccessful execution response', 'Environment does not have deployments'
      end

      context 'when namespace is empty' do
        before do
          allow(environment).to receive(:deployment_namespace).and_return('')
        end

        it_behaves_like 'unsuccessful execution response', 'Environment does not have deployments'
      end
    end
  end

  describe 'GET #k8s' do
    it_behaves_like 'pod logs service', :k8s, PodLogs::KubernetesService
  end

  describe 'GET #elasticsearch' do
    it_behaves_like 'pod logs service', :elasticsearch, PodLogs::ElasticsearchService
  end

  def environment_params(opts = {})
    opts.reverse_merge(namespace_id: project.namespace,
                       project_id: project,
                       environment_name: environment.name)
  end
end