# frozen_string_literal: true

require 'spec_helper'

describe Ci::CreatePipelineService do
  include ProjectForksHelper

  set(:project) { create(:project, :repository) }
  let(:user) { create(:admin) }
  let(:ref_name) { 'refs/heads/master' }

  before do
    stub_repository_ci_yaml_file(sha: anything)
  end

  describe '#execute' do
    # rubocop:disable Metrics/ParameterLists
    def execute_service(
      source: :push,
      after: project.commit.id,
      message: 'Message',
      ref: ref_name,
      trigger_request: nil,
      variables_attributes: nil,
      merge_request: nil,
      push_options: nil,
      source_sha: nil,
      target_sha: nil,
      save_on_errors: true)
      params = { ref: ref,
                 before: '00000000',
                 after: after,
                 commits: [{ message: message }],
                 variables_attributes: variables_attributes,
                 push_options: push_options,
                 source_sha: source_sha,
                 target_sha: target_sha }

      described_class.new(project, user, params).execute(
        source, save_on_errors: save_on_errors, trigger_request: trigger_request, merge_request: merge_request)
    end
    # rubocop:enable Metrics/ParameterLists

    context 'valid params' do
      let(:pipeline) { execute_service }

      let(:pipeline_on_previous_commit) do
        execute_service(
          after: previous_commit_sha_from_ref('master')
        )
      end

      it 'creates a pipeline' do
        expect(pipeline).to be_kind_of(Ci::Pipeline)
        expect(pipeline).to be_valid
        expect(pipeline).to be_persisted
        expect(pipeline).to be_push
        expect(pipeline).to eq(project.ci_pipelines.last)
        expect(pipeline).to have_attributes(user: user)
        expect(pipeline).to have_attributes(status: 'pending')
        expect(pipeline.iid).not_to be_nil
        expect(pipeline.repository_source?).to be true
        expect(pipeline.builds.first).to be_kind_of(Ci::Build)
      end

      it 'increments the prometheus counter' do
        expect(Gitlab::Metrics).to receive(:counter)
          .with(:pipelines_created_total, "Counter of pipelines created")
          .and_call_original

        pipeline
      end

      context 'when merge requests already exist for this source branch' do
        let(:merge_request_1) do
          create(:merge_request, source_branch: 'feature', target_branch: "master", source_project: project)
        end
        let(:merge_request_2) do
          create(:merge_request, source_branch: 'feature', target_branch: "v1.1.0", source_project: project)
        end

        context 'when related merge request is already merged' do
          let!(:merged_merge_request) do
            create(:merge_request, source_branch: 'master', target_branch: "branch_2", source_project: project, state: 'merged')
          end

          it 'does not schedule update head pipeline job' do
            expect(UpdateHeadPipelineForMergeRequestWorker).not_to receive(:perform_async).with(merged_merge_request.id)

            execute_service
          end
        end

        context 'when the head pipeline sha equals merge request sha' do
          it 'updates head pipeline of each merge request' do
            merge_request_1
            merge_request_2

            head_pipeline = execute_service(ref: 'feature', after: nil)

            expect(merge_request_1.reload.head_pipeline).to eq(head_pipeline)
            expect(merge_request_2.reload.head_pipeline).to eq(head_pipeline)
          end
        end

        context 'when the head pipeline sha does not equal merge request sha' do
          it 'does not update the head piepeline of MRs' do
            merge_request_1
            merge_request_2

            allow_any_instance_of(Ci::Pipeline).to receive(:latest?).and_return(true)

            expect { execute_service(after: 'ae73cb07c9eeaf35924a10f713b364d32b2dd34f') }.not_to raise_error

            last_pipeline = Ci::Pipeline.last

            expect(merge_request_1.reload.head_pipeline).not_to eq(last_pipeline)
            expect(merge_request_2.reload.head_pipeline).not_to eq(last_pipeline)
          end
        end

        context 'when there is no pipeline for source branch' do
          it "does not update merge request head pipeline" do
            merge_request = create(:merge_request, source_branch: 'feature',
                                                   target_branch: "branch_1",
                                                   source_project: project)

            head_pipeline = execute_service

            expect(merge_request.reload.head_pipeline).not_to eq(head_pipeline)
          end
        end

        context 'when merge request target project is different from source project' do
          let!(:project) { fork_project(target_project, nil, repository: true) }
          let!(:target_project) { create(:project, :repository) }

          it 'updates head pipeline for merge request' do
            merge_request = create(:merge_request, source_branch: 'feature',
                                                   target_branch: "master",
                                                   source_project: project,
                                                   target_project: target_project)

            head_pipeline = execute_service(ref: 'feature', after: nil)

            expect(merge_request.reload.head_pipeline).to eq(head_pipeline)
          end
        end

        context 'when the pipeline is not the latest for the branch' do
          it 'does not update merge request head pipeline' do
            merge_request = create(:merge_request, source_branch: 'master',
                                                   target_branch: "branch_1",
                                                   source_project: project)

            allow_any_instance_of(MergeRequest)
              .to receive(:find_actual_head_pipeline) { }

            execute_service

            expect(merge_request.reload.head_pipeline).to be_nil
          end
        end

        context 'when pipeline has errors' do
          before do
            stub_ci_pipeline_yaml_file('some invalid syntax')
          end

          it 'updates merge request head pipeline reference' do
            merge_request = create(:merge_request, source_branch: 'master',
                                                   target_branch: 'feature',
                                                   source_project: project)

            head_pipeline = execute_service

            expect(head_pipeline).to be_persisted
            expect(head_pipeline.yaml_errors).to be_present
            expect(merge_request.reload.head_pipeline).to eq head_pipeline
          end
        end

        context 'when pipeline has been skipped' do
          before do
            allow_any_instance_of(Ci::Pipeline)
              .to receive(:git_commit_message)
              .and_return('some commit [ci skip]')
          end

          it 'updates merge request head pipeline' do
            merge_request = create(:merge_request, source_branch: 'master',
                                                   target_branch: 'feature',
                                                   source_project: project)

            head_pipeline = execute_service

            expect(head_pipeline).to be_skipped
            expect(head_pipeline).to be_persisted
            expect(merge_request.reload.head_pipeline).to eq head_pipeline
          end
        end
      end

      context 'auto-cancel enabled' do
        before do
          project.update(auto_cancel_pending_pipelines: 'enabled')
        end

        it 'does not cancel HEAD pipeline' do
          pipeline
          pipeline_on_previous_commit

          expect(pipeline.reload).to have_attributes(status: 'pending', auto_canceled_by_id: nil)
        end

        it 'auto cancel pending non-HEAD pipelines' do
          pipeline_on_previous_commit
          pipeline

          expect(pipeline_on_previous_commit.reload).to have_attributes(status: 'canceled', auto_canceled_by_id: pipeline.id)
        end

        it 'does not cancel running outdated pipelines' do
          pipeline_on_previous_commit.run
          execute_service

          expect(pipeline_on_previous_commit.reload).to have_attributes(status: 'running', auto_canceled_by_id: nil)
        end

        it 'cancel created outdated pipelines' do
          pipeline_on_previous_commit.update(status: 'created')
          pipeline

          expect(pipeline_on_previous_commit.reload).to have_attributes(status: 'canceled', auto_canceled_by_id: pipeline.id)
        end

        it 'does not cancel pipelines from the other branches' do
          pending_pipeline = execute_service(
            ref: 'refs/heads/feature',
            after: previous_commit_sha_from_ref('feature')
          )
          pipeline

          expect(pending_pipeline.reload).to have_attributes(status: 'pending', auto_canceled_by_id: nil)
        end
      end

      context 'auto-cancel disabled' do
        before do
          project.update(auto_cancel_pending_pipelines: 'disabled')
        end

        it 'does not auto cancel pending non-HEAD pipelines' do
          pipeline_on_previous_commit
          pipeline

          expect(pipeline_on_previous_commit.reload)
            .to have_attributes(status: 'pending', auto_canceled_by_id: nil)
        end
      end

      def previous_commit_sha_from_ref(ref)
        project.commit(ref).parent.sha
      end
    end

    context "skip tag if there is no build for it" do
      it "creates commit if there is appropriate job" do
        expect(execute_service).to be_persisted
      end

      it "creates commit if there is no appropriate job but deploy job has right ref setting" do
        config = YAML.dump({ deploy: { script: "ls", only: ["master"] } })
        stub_ci_pipeline_yaml_file(config)

        expect(execute_service).to be_persisted
      end
    end

    it 'skips creating pipeline for refs without .gitlab-ci.yml' do
      stub_ci_pipeline_yaml_file(nil)

      expect(execute_service).not_to be_persisted
      expect(Ci::Pipeline.count).to eq(0)
    end

    shared_examples 'a failed pipeline' do
      it 'creates failed pipeline' do
        stub_ci_pipeline_yaml_file(ci_yaml)

        pipeline = execute_service(message: message)

        expect(pipeline).to be_persisted
        expect(pipeline.builds.any?).to be false
        expect(pipeline.status).to eq('failed')
        expect(pipeline.yaml_errors).not_to be_nil
      end
    end

    context 'when yaml is invalid' do
      let(:ci_yaml) { 'invalid: file: fiile' }
      let(:message) { 'Message' }

      it_behaves_like 'a failed pipeline'

      context 'when receive git commit' do
        before do
          allow_any_instance_of(Ci::Pipeline).to receive(:git_commit_message) { message }
        end

        it_behaves_like 'a failed pipeline'
      end

      context 'when config has ports' do
        context 'in the main image' do
          let(:ci_yaml) do
            <<-EOS
              image:
                name: ruby:2.2
                ports:
                  - 80
            EOS
          end

          it_behaves_like 'a failed pipeline'
        end

        context 'in the job image' do
          let(:ci_yaml) do
            <<-EOS
              image: ruby:2.2

              test:
                script: rspec
                image:
                  name: ruby:2.2
                  ports:
                    - 80
            EOS
          end

          it_behaves_like 'a failed pipeline'
        end

        context 'in the service' do
          let(:ci_yaml) do
            <<-EOS
              image: ruby:2.2

              test:
                script: rspec
                image: ruby:2.2
                services:
                  - name: test
                    ports:
                      - 80
            EOS
          end

          it_behaves_like 'a failed pipeline'
        end
      end
    end

    context 'when commit contains a [ci skip] directive' do
      let(:message) { "some message[ci skip]" }

      ci_messages = [
        "some message[ci skip]",
        "some message[skip ci]",
        "some message[CI SKIP]",
        "some message[SKIP CI]",
        "some message[ci_skip]",
        "some message[skip_ci]",
        "some message[ci-skip]",
        "some message[skip-ci]"
      ]

      before do
        allow_any_instance_of(Ci::Pipeline).to receive(:git_commit_message) { message }
      end

      ci_messages.each do |ci_message|
        it "skips builds creation if the commit message is #{ci_message}" do
          pipeline = execute_service(message: ci_message)

          expect(pipeline).to be_persisted
          expect(pipeline.builds.any?).to be false
          expect(pipeline.status).to eq("skipped")
        end
      end

      shared_examples 'creating a pipeline' do
        it 'does not skip pipeline creation' do
          allow_any_instance_of(Ci::Pipeline).to receive(:git_commit_message) { commit_message }

          pipeline = execute_service(message: commit_message)

          expect(pipeline).to be_persisted
          expect(pipeline.builds.first.name).to eq("rspec")
        end
      end

      context 'when commit message does not contain [ci skip] nor [skip ci]' do
        let(:commit_message) { 'some message' }

        it_behaves_like 'creating a pipeline'
      end

      context 'when commit message is nil' do
        let(:commit_message) { nil }

        it_behaves_like 'creating a pipeline'
      end

      context 'when there is [ci skip] tag in commit message and yaml is invalid' do
        let(:ci_yaml) { 'invalid: file: fiile' }

        it_behaves_like 'a failed pipeline'
      end
    end

    context 'when push options contain ci.skip' do
      let(:push_options) do
        { 'ci' => { 'skip' => true } }
      end

      it 'creates a pipline in the skipped state' do
        pipeline = execute_service(push_options: push_options)

        # TODO: DRY these up with "skips builds creation if the commit message"
        expect(pipeline).to be_persisted
        expect(pipeline.builds.any?).to be false
        expect(pipeline.status).to eq("skipped")
      end
    end

    context 'when there are no jobs for this pipeline' do
      before do
        config = YAML.dump({ test: { script: 'ls', only: ['feature'] } })
        stub_ci_pipeline_yaml_file(config)
      end

      it 'does not create a new pipeline' do
        result = execute_service

        expect(result).not_to be_persisted
        expect(Ci::Build.all).to be_empty
        expect(Ci::Pipeline.count).to eq(0)
      end

      describe '#iid' do
        let(:internal_id) do
          InternalId.find_by(project_id: project.id, usage: :ci_pipelines)
        end

        before do
          expect_any_instance_of(Ci::Pipeline).to receive(:ensure_project_iid!)
            .and_call_original
        end

        context 'when ci_pipeline_rewind_iid is enabled' do
          before do
            stub_feature_flags(ci_pipeline_rewind_iid: true)
          end

          it 'rewinds iid' do
            result = execute_service

            expect(result).not_to be_persisted
            expect(internal_id.last_value).to eq(0)
          end
        end

        context 'when ci_pipeline_rewind_iid is disabled' do
          before do
            stub_feature_flags(ci_pipeline_rewind_iid: false)
          end

          it 'does not rewind iid' do
            result = execute_service

            expect(result).not_to be_persisted
            expect(internal_id.last_value).to eq(1)
          end
        end
      end
    end

    context 'with manual actions' do
      before do
        config = YAML.dump({ deploy: { script: 'ls', when: 'manual' } })
        stub_ci_pipeline_yaml_file(config)
      end

      it 'does not create a new pipeline' do
        result = execute_service

        expect(result).to be_persisted
        expect(result.manual_actions).not_to be_empty
      end
    end

    context 'with environment' do
      before do
        config = YAML.dump(
          deploy: {
            environment: { name: "review/$CI_COMMIT_REF_NAME" },
            script: 'ls',
            tags: ['hello']
          })

        stub_ci_pipeline_yaml_file(config)
      end

      it 'creates the environment with tags' do
        result = execute_service

        expect(result).to be_persisted
        expect(Environment.find_by(name: "review/master")).to be_present
        expect(result.builds.first.tag_list).to contain_exactly('hello')
        expect(result.builds.first.deployment).to be_persisted
        expect(result.builds.first.deployment.deployable).to be_a(Ci::Build)
      end
    end

    context 'with environment name including persisted variables' do
      before do
        config = YAML.dump(
          deploy: {
            environment: { name: "review/id1$CI_PIPELINE_ID/id2$CI_BUILD_ID" },
            script: 'ls'
          }
        )

        stub_ci_pipeline_yaml_file(config)
      end

      it 'skipps persisted variables in environment name' do
        result = execute_service

        expect(result).to be_persisted
        expect(Environment.find_by(name: "review/id1/id2")).to be_present
      end
    end

    context 'when environment with invalid name' do
      before do
        config = YAML.dump(deploy: { environment: { name: 'name,with,commas' }, script: 'ls' })
        stub_ci_pipeline_yaml_file(config)
      end

      it 'does not create an environment' do
        expect do
          result = execute_service

          expect(result).to be_persisted
        end.not_to change { Environment.count }
      end
    end

    context 'when builds with auto-retries are configured' do
      context 'as an integer' do
        before do
          config = YAML.dump(rspec: { script: 'rspec', retry: 2 })
          stub_ci_pipeline_yaml_file(config)
        end

        it 'correctly creates builds with auto-retry value configured' do
          pipeline = execute_service

          expect(pipeline).to be_persisted
          expect(pipeline.builds.find_by(name: 'rspec').retries_max).to eq 2
          expect(pipeline.builds.find_by(name: 'rspec').retry_when).to eq ['always']
        end
      end

      context 'as hash' do
        before do
          config = YAML.dump(rspec: { script: 'rspec', retry: { max: 2, when: 'runner_system_failure' } })
          stub_ci_pipeline_yaml_file(config)
        end

        it 'correctly creates builds with auto-retry value configured' do
          pipeline = execute_service

          expect(pipeline).to be_persisted
          expect(pipeline.builds.find_by(name: 'rspec').retries_max).to eq 2
          expect(pipeline.builds.find_by(name: 'rspec').retry_when).to eq ['runner_system_failure']
        end
      end
    end

    shared_examples 'when ref is protected' do
      let(:user) { create(:user) }

      context 'when user is developer' do
        before do
          project.add_developer(user)
        end

        it 'does not create a pipeline' do
          expect(execute_service).not_to be_persisted
          expect(Ci::Pipeline.count).to eq(0)
        end
      end

      context 'when user is maintainer' do
        let(:pipeline) { execute_service }

        before do
          project.add_maintainer(user)
        end

        it 'creates a protected pipeline' do
          expect(pipeline).to be_persisted
          expect(pipeline).to be_protected
          expect(Ci::Pipeline.count).to eq(1)
        end
      end

      context 'when trigger belongs to no one' do
        let(:user) {}
        let(:trigger_request) { create(:ci_trigger_request) }

        it 'does not create a pipeline' do
          expect(execute_service(trigger_request: trigger_request))
            .not_to be_persisted
          expect(Ci::Pipeline.count).to eq(0)
        end
      end

      context 'when trigger belongs to a developer' do
        let(:user) { create(:user) }
        let(:trigger) { create(:ci_trigger, owner: user) }
        let(:trigger_request) { create(:ci_trigger_request, trigger: trigger) }

        before do
          project.add_developer(user)
        end

        it 'does not create a pipeline' do
          expect(execute_service(trigger_request: trigger_request))
            .not_to be_persisted
          expect(Ci::Pipeline.count).to eq(0)
        end
      end

      context 'when trigger belongs to a maintainer' do
        let(:user) { create(:user) }
        let(:trigger) { create(:ci_trigger, owner: user) }
        let(:trigger_request) { create(:ci_trigger_request, trigger: trigger) }

        before do
          project.add_maintainer(user)
        end

        it 'creates a pipeline' do
          expect(execute_service(trigger_request: trigger_request))
            .to be_persisted
          expect(Ci::Pipeline.count).to eq(1)
        end
      end
    end

    context 'when ref is a protected branch' do
      before do
        create(:protected_branch, project: project, name: 'master')
      end

      it_behaves_like 'when ref is protected'
    end

    context 'when ref is a protected tag' do
      let(:ref_name) { 'refs/tags/v1.0.0' }

      before do
        create(:protected_tag, project: project, name: '*')
      end

      it_behaves_like 'when ref is protected'
    end

    context 'when ref is not protected' do
      context 'when trigger belongs to no one' do
        let(:user) {}
        let(:trigger) { create(:ci_trigger, owner: nil) }
        let(:trigger_request) { create(:ci_trigger_request, trigger: trigger) }
        let(:pipeline) { execute_service(trigger_request: trigger_request) }

        it 'creates an unprotected pipeline' do
          expect(pipeline).to be_persisted
          expect(pipeline).not_to be_protected
          expect(Ci::Pipeline.count).to eq(1)
        end
      end
    end

    context 'when pipeline is running for a tag' do
      before do
        config = YAML.dump(test: { script: 'test', only: ['branches'] },
                           deploy: { script: 'deploy', only: ['tags'] })

        stub_ci_pipeline_yaml_file(config)
      end

      it 'creates a tagged pipeline' do
        pipeline = execute_service(ref: 'v1.0.0')

        expect(pipeline.tag?).to be true
      end
    end

    context 'when pipeline variables are specified' do
      let(:variables_attributes) do
        [{ key: 'first', secret_value: 'world' },
         { key: 'second', secret_value: 'second_world' }]
      end

      subject { execute_service(variables_attributes: variables_attributes) }

      it 'creates a pipeline with specified variables' do
        expect(subject.variables.map { |var| var.slice(:key, :secret_value) })
          .to eq variables_attributes.map(&:with_indifferent_access)
      end
    end

    context 'when pipeline has a job with environment' do
      let(:pipeline) { execute_service }

      before do
        stub_ci_pipeline_yaml_file(YAML.dump(config))
      end

      context 'when environment name is valid' do
        let(:config) do
          {
            review_app: {
              script: 'deploy',
              environment: {
                name: 'review/${CI_COMMIT_REF_NAME}',
                url: 'http://${CI_COMMIT_REF_SLUG}-staging.example.com'
              }
            }
          }
        end

        it 'has a job with environment' do
          expect(pipeline.builds.count).to eq(1)
          expect(pipeline.builds.first.persisted_environment.name).to eq('review/master')
          expect(pipeline.builds.first.deployment).to be_created
        end
      end

      context 'when environment name is invalid' do
        let(:config) do
          {
            'job:deploy-to-test-site': {
              script: 'deploy',
              environment: {
                name: '${CI_JOB_NAME}',
                url: 'https://$APP_URL'
              }
            }
          }
        end

        it 'has a job without environment' do
          expect(pipeline.builds.count).to eq(1)
          expect(pipeline.builds.first.persisted_environment).to be_nil
          expect(pipeline.builds.first.deployment).to be_nil
        end
      end
    end

    describe 'Pipelines for merge requests' do
      let(:pipeline) do
        execute_service(source: source,
                        merge_request: merge_request,
                        ref: ref_name,
                        source_sha: source_sha,
                        target_sha: target_sha)
      end

      before do
        stub_ci_pipeline_yaml_file(YAML.dump(config))
      end

      let(:ref_name) { 'refs/heads/feature' }
      let(:source_sha) { project.commit(ref_name).id }
      let(:target_sha) { nil }

      context 'when source is merge request' do
        let(:source) { :merge_request_event }

        context "when config has merge_requests keywords" do
          let(:config) do
            {
              build: {
                stage: 'build',
                script: 'echo'
              },
              test: {
                stage: 'test',
                script: 'echo',
                only: ['merge_requests']
              },
              pages: {
                stage: 'deploy',
                script: 'echo',
                except: ['merge_requests']
              }
            }
          end

          context 'when merge request is specified' do
            let(:merge_request) do
              create(:merge_request,
                source_project: project,
                source_branch: 'feature',
                target_project: project,
                target_branch: 'master')
            end

            let(:ref_name) { merge_request.ref_path }

            it 'creates a detached merge request pipeline' do
              expect(pipeline).to be_persisted
              expect(pipeline).to be_merge_request_event
              expect(pipeline.merge_request).to eq(merge_request)
              expect(pipeline.builds.order(:stage_id).map(&:name)).to eq(%w[test])
            end

            it 'persists the specified source sha' do
              expect(pipeline.source_sha).to eq(source_sha)
            end

            it 'does not persist target sha for detached merge request pipeline' do
              expect(pipeline.target_sha).to be_nil
            end

            it 'schedules update for the head pipeline of the merge request' do
              expect(UpdateHeadPipelineForMergeRequestWorker)
                .to receive(:perform_async).with(merge_request.id)

              pipeline
            end

            context 'when target sha is specified' do
              let(:target_sha) { merge_request.target_branch_sha }

              it 'persists the target sha' do
                expect(pipeline.target_sha).to eq(target_sha)
              end
            end

            context 'when ref is tag' do
              let(:ref_name) { 'refs/tags/v1.1.0' }

              it 'does not create a merge request pipeline' do
                expect(pipeline).not_to be_persisted
                expect(pipeline.errors[:tag]).to eq(["is not included in the list"])
              end
            end

            context 'when merge request is created from a forked project' do
              let(:merge_request) do
                create(:merge_request,
                  source_project: project,
                  source_branch: 'feature',
                  target_project: target_project,
                  target_branch: 'master')
              end

              let(:ref_name) { 'refs/heads/feature' }
              let!(:project) { fork_project(target_project, nil, repository: true) }
              let!(:target_project) { create(:project, :repository) }

              it 'creates a legacy detached merge request pipeline in the forked project' do
                expect(pipeline).to be_persisted
                expect(project.ci_pipelines).to eq([pipeline])
                expect(target_project.ci_pipelines).to be_empty
              end
            end

            context "when there are no matched jobs" do
              let(:config) do
                {
                  test: {
                    stage: 'test',
                    script: 'echo',
                    except: ['merge_requests']
                  }
                }
              end

              it 'does not create a detached merge request pipeline' do
                expect(pipeline).not_to be_persisted
                expect(pipeline.errors[:base]).to eq(["No stages / jobs for this pipeline."])
              end
            end
          end

          context 'when merge request is not specified' do
            let(:merge_request) { nil }

            it 'does not create a detached merge request pipeline' do
              expect(pipeline).not_to be_persisted
              expect(pipeline.errors[:merge_request]).to eq(["can't be blank"])
            end
          end
        end

        context "when config does not have merge_requests keywords" do
          let(:config) do
            {
              build: {
                stage: 'build',
                script: 'echo'
              },
              test: {
                stage: 'test',
                script: 'echo'
              },
              pages: {
                stage: 'deploy',
                script: 'echo'
              }
            }
          end

          context 'when merge request is specified' do
            let(:merge_request) do
              create(:merge_request,
                source_project: project,
                source_branch: Gitlab::Git.ref_name(ref_name),
                target_project: project,
                target_branch: 'master')
            end

            it 'does not create a detached merge request pipeline' do
              expect(pipeline).not_to be_persisted

              expect(pipeline.errors[:base])
                .to eq(['No stages / jobs for this pipeline.'])
            end
          end

          context 'when merge request is not specified' do
            let(:merge_request) { nil }

            it 'does not create a detached merge request pipeline' do
              expect(pipeline).not_to be_persisted

              expect(pipeline.errors[:base])
                .to eq(['No stages / jobs for this pipeline.'])
            end
          end
        end

        context "when config uses regular expression for only keyword" do
          let(:config) do
            {
              build: {
                stage: 'build',
                script: 'echo',
                only: ["/^#{ref_name}$/"]
              }
            }
          end

          context 'when merge request is specified' do
            let(:merge_request) do
              create(:merge_request,
                source_project: project,
                source_branch: ref_name,
                target_project: project,
                target_branch: 'master')
            end

            it 'does not create a detached merge request pipeline' do
              expect(pipeline).not_to be_persisted

              expect(pipeline.errors[:base])
                .to eq(['No stages / jobs for this pipeline.'])
            end
          end
        end

        context "when config uses variables for only keyword" do
          let(:config) do
            {
              build: {
                stage: 'build',
                script: 'echo',
                only: {
                  variables: %w($CI)
                }
              }
            }
          end

          context 'when merge request is specified' do
            let(:merge_request) do
              create(:merge_request,
                source_project: project,
                source_branch: ref_name,
                target_project: project,
                target_branch: 'master')
            end

            it 'does not create a detached merge request pipeline' do
              expect(pipeline).not_to be_persisted

              expect(pipeline.errors[:base])
                .to eq(['No stages / jobs for this pipeline.'])
            end
          end
        end

        context "when config has 'except: [tags]'" do
          let(:config) do
            {
              build: {
                stage: 'build',
                script: 'echo',
                except: ['tags']
              }
            }
          end

          context 'when merge request is specified' do
            let(:merge_request) do
              create(:merge_request,
                source_project: project,
                source_branch: ref_name,
                target_project: project,
                target_branch: 'master')
            end

            it 'does not create a detached merge request pipeline' do
              expect(pipeline).not_to be_persisted

              expect(pipeline.errors[:base])
                .to eq(['No stages / jobs for this pipeline.'])
            end
          end
        end
      end

      context 'when source is web' do
        let(:source) { :web }

        context "when config has merge_requests keywords" do
          let(:config) do
            {
              build: {
                stage: 'build',
                script: 'echo'
              },
              test: {
                stage: 'test',
                script: 'echo',
                only: ['merge_requests']
              },
              pages: {
                stage: 'deploy',
                script: 'echo',
                except: ['merge_requests']
              }
            }
          end

          context 'when merge request is specified' do
            let(:merge_request) do
              create(:merge_request,
                source_project: project,
                source_branch: Gitlab::Git.ref_name(ref_name),
                target_project: project,
                target_branch: 'master')
            end

            it 'does not create a merge request pipeline' do
              expect(pipeline).not_to be_persisted
              expect(pipeline.errors[:merge_request]).to eq(["must be blank"])
            end
          end

          context 'when merge request is not specified' do
            let(:merge_request) { nil }

            it 'creates a branch pipeline' do
              expect(pipeline).to be_persisted
              expect(pipeline).to be_web
              expect(pipeline.merge_request).to be_nil
              expect(pipeline.builds.order(:stage_id).map(&:name)).to eq(%w[build pages])
            end
          end
        end
      end
    end
  end

  describe '#execute!' do
    subject { service.execute!(*args) }

    let(:service) { described_class.new(project, user, ref: ref_name) }
    let(:args) { [:push] }

    context 'when user has a permission to create a pipeline' do
      let(:user) { create(:user) }

      before do
        project.add_developer(user)
      end

      it 'does not raise an error' do
        expect { subject }.not_to raise_error
      end

      it 'creates a pipeline' do
        expect { subject }.to change { Ci::Pipeline.count }.by(1)
      end
    end

    context 'when user does not have a permission to create a pipeline' do
      let(:user) { create(:user) }

      it 'raises an error' do
        expect { subject }
          .to raise_error(described_class::CreateError)
          .with_message('Insufficient permissions to create a new pipeline')
      end
    end
  end
end
