require 'gir_ffi_test_helper'

describe GirFFI::Builders::CallbackReturnValueBuilder do
  let(:var_gen) { GirFFI::VariableNameGenerator.new }
  let(:return_value_info) { GirFFI::ReturnValueInfo.new(type_info, ownership_transfer, false) }
  let(:type_info) { callback_info.return_type }
  let(:ownership_transfer) { callback_info.caller_owns }
  let(:builder) {
    GirFFI::Builders::CallbackReturnValueBuilder.new(var_gen,
                                                     return_value_info)
  }

  before do
    skip unless callback_info
  end

  describe 'for :gint32' do
    let(:callback_info) { get_introspection_data('GIMarshallingTests', 'CallbackIntInt') }

    it 'has no statements in #post_conversion' do
      builder.post_conversion.must_equal []
    end

    it 'returns the result of the callback directly' do
      builder.capture_variable_name.must_equal '_v1'
      builder.return_value_name.must_equal '_v1'
    end
  end

  describe 'for :void' do
    let(:callback_info) {
      get_introspection_data('GIMarshallingTests',
                             'CallbackMultipleOutParameters')
    }

    it 'has no statements in #post_conversion' do
      builder.post_conversion.must_equal []
    end

    it 'returns nothing' do
      builder.capture_variable_name.must_be_nil
      builder.return_value_name.must_be_nil
    end
  end

  describe 'for :enum' do
    let(:callback_info) {
      get_vfunc_introspection_data('GIMarshallingTests',
                                   'Object',
                                   'vfunc_return_enum')
    }

    it 'converts the result' do
      # Ensure variable names are generated in order
      builder.capture_variable_name.must_equal '_v1'
      builder.post_conversion.must_equal ['_v2 = GIMarshallingTests::Enum.from(_v1)']
    end

    it 'returns the result of the conversion' do
      builder.capture_variable_name.must_equal '_v1'
      builder.return_value_name.must_equal '_v2'
    end
  end

  describe 'for :object with full transfer' do
    let(:callback_info) {
      get_vfunc_introspection_data('GIMarshallingTests',
                                   'Object',
                                   'vfunc_return_object_transfer_full')
    }

    it 'increases the refcount of the result and converts it to a pointer' do
      # Ensure variable names are generated in order
      builder.capture_variable_name.must_equal '_v1'
      builder.post_conversion.must_equal ['_v2 = GObject::Object.from(_v1.ref).to_ptr']
    end

    it 'returns the result of the conversion' do
      builder.capture_variable_name.must_equal '_v1'
      builder.return_value_name.must_equal '_v2'
    end
  end
end