# frozen_string_literal: true

require 'spec_helper'

describe GitlabSchema do
  let(:user) { build :user }

  it 'uses batch loading' do
    expect(field_instrumenters).to include(BatchLoader::GraphQL)
  end

  it 'enables the preload instrumenter' do
    expect(field_instrumenters).to include(BatchLoader::GraphQL)
  end

  it 'enables the authorization instrumenter' do
    expect(field_instrumenters).to include(instance_of(::Gitlab::Graphql::Authorize::Instrumentation))
  end

  it 'enables using presenters' do
    expect(field_instrumenters).to include(instance_of(::Gitlab::Graphql::Present::Instrumentation))
  end

  it 'has the base mutation' do
    expect(described_class.mutation).to eq(::Types::MutationType.to_graphql)
  end

  it 'has the base query' do
    expect(described_class.query).to eq(::Types::QueryType.to_graphql)
  end

  it 'paginates active record relations using `Gitlab::Graphql::Connections::KeysetConnection`' do
    connection = GraphQL::Relay::BaseConnection::CONNECTION_IMPLEMENTATIONS[ActiveRecord::Relation.name]

    expect(connection).to eq(Gitlab::Graphql::Connections::KeysetConnection)
  end

  describe '.execute' do
    context 'for different types of users' do
      context 'when no context' do
        it 'returns DEFAULT_MAX_COMPLEXITY' do
          expect(GraphQL::Schema)
            .to receive(:execute)
            .with('query', hash_including(max_complexity: GitlabSchema::DEFAULT_MAX_COMPLEXITY))

          described_class.execute('query')
        end
      end

      context 'when no user' do
        it 'returns DEFAULT_MAX_COMPLEXITY' do
          expect(GraphQL::Schema)
            .to receive(:execute)
            .with('query', hash_including(max_complexity: GitlabSchema::DEFAULT_MAX_COMPLEXITY))

          described_class.execute('query', context: {})
        end

        it 'returns DEFAULT_MAX_DEPTH' do
          expect(GraphQL::Schema)
            .to receive(:execute)
            .with('query', hash_including(max_depth: GitlabSchema::DEFAULT_MAX_DEPTH))

          described_class.execute('query', context: {})
        end
      end

      context 'when a logged in user' do
        it 'returns AUTHENTICATED_COMPLEXITY' do
          expect(GraphQL::Schema).to receive(:execute).with('query', hash_including(max_complexity: GitlabSchema::AUTHENTICATED_COMPLEXITY))

          described_class.execute('query', context: { current_user: user })
        end

        it 'returns AUTHENTICATED_MAX_DEPTH' do
          expect(GraphQL::Schema).to receive(:execute).with('query', hash_including(max_depth: GitlabSchema::AUTHENTICATED_MAX_DEPTH))

          described_class.execute('query', context: { current_user: user })
        end
      end

      context 'when an admin user' do
        it 'returns ADMIN_COMPLEXITY' do
          user = build :user, :admin

          expect(GraphQL::Schema).to receive(:execute).with('query', hash_including(max_complexity: GitlabSchema::ADMIN_COMPLEXITY))

          described_class.execute('query', context: { current_user: user })
        end
      end

      context 'when max_complexity passed on the query' do
        it 'returns what was passed on the query' do
          expect(GraphQL::Schema).to receive(:execute).with('query', hash_including(max_complexity: 1234))

          described_class.execute('query', max_complexity: 1234)
        end
      end

      context 'when max_depth passed on the query' do
        it 'returns what was passed on the query' do
          expect(GraphQL::Schema).to receive(:execute).with('query', hash_including(max_depth: 1234))

          described_class.execute('query', max_depth: 1234)
        end
      end
    end
  end

  describe '.id_from_object' do
    it 'returns a global id' do
      expect(described_class.id_from_object(build(:project, id: 1))).to be_a(GlobalID)
    end

    it "raises a meaningful error if a global id couldn't be generated" do
      expect { described_class.id_from_object(build(:commit)) }
        .to raise_error(RuntimeError, /include `GlobalID::Identification` into/i)
    end
  end

  describe '.object_from_id' do
    context 'for subclasses of `ApplicationRecord`' do
      it 'returns the correct record' do
        user = create(:user)

        result = described_class.object_from_id(user.to_global_id.to_s)

        expect(result.__sync).to eq(user)
      end

      it 'batchloads the queries' do
        user1 = create(:user)
        user2 = create(:user)

        expect do
          [described_class.object_from_id(user1.to_global_id),
           described_class.object_from_id(user2.to_global_id)].map(&:__sync)
        end.not_to exceed_query_limit(1)
      end
    end

    context 'for other classes' do
      # We cannot use an anonymous class here as `GlobalID` expects `.name` not
      # to return `nil`
      class TestGlobalId
        include GlobalID::Identification
        attr_accessor :id

        def initialize(id)
          @id = id
        end
      end

      it 'falls back to a regular find' do
        result = TestGlobalId.new(123)

        expect(TestGlobalId).to receive(:find).with("123").and_return(result)

        expect(described_class.object_from_id(result.to_global_id)).to eq(result)
      end
    end

    it 'raises the correct error on invalid input' do
      expect { described_class.object_from_id("bogus id") }.to raise_error(Gitlab::Graphql::Errors::ArgumentError)
    end
  end

  def field_instrumenters
    described_class.instrumenters[:field] + described_class.instrumenters[:field_after_built_ins]
  end
end
