RSpec.shared_examples 'mongo connector' do |options|
  model_name = options.fetch(:model_name)
  factory_name = options[:factory_name] || model_name
  commands = options.fetch(:only)

  if commands.include?(:insert)
    insert_method_name = "#{model_name}_insert"

    describe "##{insert_method_name}" do
      let(:model) { build(factory_name) }
      subject { @connector.send(insert_method_name, model) }

      before { allow(model).to receive(:validate!).and_return(true) }
      after { @tester_connector.cleanup }

      it 'inserts new record' do
        expect {subject}.to change {@tester_connector.list.size}.from(0).to(1)
      end

      it 'validates inserted record' do
        expect(model).to receive(:validate!)
        subject
      end

      it "doesn't insert nonvalid records" do
        allow(model).to receive(:validate!) { raise InvalidRecord.new('') }
        expect {subject}.to raise_error(InvalidRecord)
      end

      it 'sets created_at of record' do
        expect(model.created_at).to be nil
        subject
        expect(@tester_connector.list.first['created_at']).not_to be nil
      end

      it 'raises error if record with such id already exists' do
        @tester_connector.create(id: model.id)
        expect {subject}.to raise_error(InvalidRecord)
      end
    end
  end

  if commands.include?(:list)
    list_method_name = "#{model_name.to_s.pluralize}"

    describe "##{list_method_name}" do
      subject { @connector.send(list_method_name) }

      it 'should be empty if collection is empty' do
        expect(subject).to eq []
      end

      it "returns array of #{model_name.to_s.pluralize} if collection isn't empty" do
        @tester_connector.create_list(2) do
          expect(subject).to be_an_array_of(model_class).and have_size(2)
        end
      end
    end
  end

  if commands.include?(:show)
    show_method_name = model_name

    describe "##{show_method_name}" do
      subject { @connector.send(show_method_name, 'foo') }

      it 'raises RecordNotFound when there is no such record' do
        expect { subject }.to raise_error(RecordNotFound)
      end

      it 'returns record if was found' do
        @tester_connector.create(build(factory_name, id: 'foo').to_mongo_hash) do
          expect(subject).to be_an_instance_of(model_class)
        end
      end
    end
  end

  if commands.include?(:update)
    update_method_name = "#{model_name}_update"
    field_to_update = options.fetch(:field_to_update).to_s

    describe "##{update_method_name}" do
      let(:model) { build(model_name, field_to_update => 'new_value') }
      let(:insert_model_to_update) { @tester_connector.create(attributes_for(factory_name)) }
      subject { @connector.send(update_method_name, model) }
      before { allow(model).to receive(:validate!).and_return(true) }
      after { @tester_connector.cleanup }

      it 'validates updated record' do
        insert_model_to_update
        expect(model).to receive(:validate!)
        subject
      end

      it 'updates record' do
        insert_model_to_update
        subject
        updated_value = @tester_connector.list.first[field_to_update]
        expect(updated_value).to eq 'new_value'
      end

      it 'raises RecordNotFound if there is no such record' do
        expect{ subject }.to raise_error(RecordNotFound)
      end
    end
  end

  if commands.include?(:delete)
    delete_method_name = "#{model_name}_delete"
    describe "##{delete_method_name}" do
      let(:model) { build(factory_name) }
      let(:insert_model_to_delete) { @tester_connector.create(model.to_mongo_hash) }
      subject { @connector.send(delete_method_name, model.id) }

      it 'deletes record' do
        insert_model_to_delete
        expect {subject}.to change {@tester_connector.list.empty?}.to(true)
        @tester_connector.cleanup
      end

      it 'raises RecordNotFound if there is no such record' do
        expect { subject }.to raise_error(RecordNotFound)
      end
    end
  end
end