# frozen_string_literal: true

require 'spec_helper'

RSpec.describe 'GitlabSchema configurations' do
  include GraphqlHelpers

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

  shared_examples 'imposing query limits' do
    describe 'timeouts' do
      context 'when timeout is reached' do
        it 'shows an error' do
          allow_any_instance_of(Gitlab::Graphql::Timeout).to receive(:max_seconds).and_return(0)

          subject

          expect_graphql_errors_to_include /Timeout/
        end
      end
    end

    describe '#max_complexity' do
      context 'when complexity is too high' do
        it 'shows an error' do
          allow(GitlabSchema).to receive(:max_query_complexity).and_return 1

          subject

          expect_graphql_errors_to_include /which exceeds max complexity of 1/
        end
      end
    end

    describe '#max_depth' do
      context 'when query depth is too high' do
        it 'shows error' do
          allow(GitlabSchema).to receive(:max_query_depth).and_return 1

          subject

          expect_graphql_errors_to_include /exceeds max depth/
        end
      end

      context 'when query depth is within range' do
        it 'has no error' do
          allow(GitlabSchema).to receive(:max_query_depth).and_return 5

          subject

          expect_graphql_errors_to_be_empty
        end
      end
    end
  end

  context 'depth, complexity and recursion checking' do
    context 'unauthenticated recursive queries' do
      context 'a not-quite-recursive-enough introspective query' do
        it 'succeeds' do
          query = File.read(Rails.root.join('spec/fixtures/api/graphql/small-recursive-introspection.graphql'))

          post_graphql(query, current_user: nil)

          expect_graphql_errors_to_be_empty
        end
      end

      context 'failing queries' do
        before do
          allow(GitlabSchema).to receive(:max_query_recursion).and_return 1
        end

        context 'a recursive introspective query' do
          it 'fails due to recursion' do
            query = File.read(Rails.root.join('spec/fixtures/api/graphql/recursive-introspection.graphql'))

            post_graphql(query, current_user: nil)

            expect_graphql_errors_to_include [/Recursive query/]
          end
        end

        context 'a recursive non-introspective query' do
          before do
            allow(GitlabSchema).to receive(:max_query_complexity).and_return 1
            allow(GitlabSchema).to receive(:max_query_depth).and_return 1
            allow(GitlabSchema).to receive(:max_query_complexity).and_return 1
          end

          shared_examples 'fails due to recursion, complexity and depth' do |fixture_file|
            it 'fails due to recursion, complexity and depth' do
              query = File.read(Rails.root.join(fixture_file))

              post_graphql(query, current_user: nil)

              expect_graphql_errors_to_include [/Recursive query/, /exceeds max complexity/, /exceeds max depth/]
            end
          end

          context 'using `nodes` notation' do
            it_behaves_like 'fails due to recursion, complexity and depth', 'spec/fixtures/api/graphql/recursive-query-nodes.graphql'
          end

          context 'using `edges -> node` notation' do
            it_behaves_like 'fails due to recursion, complexity and depth', 'spec/fixtures/api/graphql/recursive-query-edges-node.graphql'
          end
        end
      end
    end
  end

  context 'regular queries' do
    subject do
      query = graphql_query_for('project', { 'fullPath' => project.full_path }, %w(id name description))
      post_graphql(query)
    end

    it_behaves_like 'imposing query limits'
  end

  context 'multiplexed queries' do
    let(:current_user) { nil }

    subject do
      queries = [
        { query: graphql_query_for('project', { 'fullPath' => '$fullPath' }, %w(id name description)) }, # Complexity 4
        { query: graphql_query_for('echo', { 'text' => "$test" }, []), variables: { "test" => "Hello world" } }, # Complexity 1
        { query: graphql_query_for('project', { 'fullPath' => project.full_path }, "userPermissions { createIssue }") } # Complexity 3
      ]

      post_multiplex(queries, current_user: current_user)
    end

    it 'does not authenticate all queries' do
      subject

      expect(json_response.last['data']['project']).to be_nil
    end

    shared_examples 'query is too complex' do |description, max_complexity|
      it description, :aggregate_failures do
        allow(GitlabSchema).to receive(:max_query_complexity).and_return max_complexity

        subject

        # Expect a response for each query, even though it will be empty
        expect(json_response.size).to eq(3)
        json_response.each do |single_query_response|
          expect(single_query_response).not_to have_key('data')
        end

        # Expect errors for each query
        expect(graphql_errors.size).to eq(3)
        graphql_errors.each do |single_query_errors|
          expect_graphql_errors_to_include(/Query has complexity of 8, which exceeds max complexity of #{max_complexity}/)
        end
      end
    end

    it_behaves_like 'imposing query limits' do
      # The total complexity of the multiplex query above is 8
      it_behaves_like 'query is too complex', 'fails all queries when only one of the queries is too complex', 4
      it_behaves_like 'query is too complex', 'fails when all queries combined are too complex', 7
    end

    context 'authentication' do
      let(:current_user) { project.owner }

      it 'authenticates all queries' do
        subject

        expect(json_response.last['data']['project']['userPermissions']['createIssue']).to be(true)
      end
    end
  end

  context 'when IntrospectionQuery' do
    it 'is not too complex nor recursive' do
      query = File.read(Rails.root.join('spec/fixtures/api/graphql/introspection.graphql'))

      post_graphql(query, current_user: nil)

      expect_graphql_errors_to_be_empty
    end
  end

  context 'logging' do
    let(:query) { File.read(Rails.root.join('spec/fixtures/api/graphql/introspection.graphql')) }

    it 'logs the query complexity and depth' do
      analyzer_memo = {
        query_string: query,
        variables: {}.to_s,
        complexity: 181,
        depth: 13,
        duration_s: 7,
        operation_name: 'IntrospectionQuery',
        used_fields: an_instance_of(Array),
        used_deprecated_fields: an_instance_of(Array)
      }

      expect_any_instance_of(Gitlab::Graphql::QueryAnalyzers::LoggerAnalyzer).to receive(:duration).and_return(7)
      expect(Gitlab::GraphqlLogger).to receive(:info).with(analyzer_memo)

      post_graphql(query, current_user: nil)
    end

    it 'logs using `format_message`' do
      expect_any_instance_of(Gitlab::GraphqlLogger).to receive(:format_message)

      post_graphql(query, current_user: nil)
    end
  end

  context "global id's" do
    it 'uses GlobalID to expose ids' do
      post_graphql(graphql_query_for('project', { 'fullPath' => project.full_path }, %w(id)),
                   current_user: project.owner)

      parsed_id = GlobalID.parse(graphql_data['project']['id'])

      expect(parsed_id).to eq(project.to_global_id)
    end
  end
end