# frozen_string_literal: true
require 'gir_ffi_test_helper'

describe GirFFI::Builders::FunctionBuilder do
  describe '#method_definition' do
    let(:builder) { GirFFI::Builders::FunctionBuilder.new function_info }
    let(:code) { builder.method_definition }

    describe 'generally' do
      let(:function_info) { get_method_introspection_data 'GObject', 'Object', 'get_property' }

      it 'returns the same result when called twice' do
        original = builder.method_definition
        copy = builder.method_definition
        copy.must_equal original
      end
    end

    describe 'for Regress:test_array_fixed_out_objects' do
      let(:function_info) { get_introspection_data 'Regress', 'test_array_fixed_out_objects' }
      it 'builds a correct definition' do
        skip unless function_info
        code.must_equal <<-CODE.reset_indentation
          def self.test_array_fixed_out_objects
            _v1 = FFI::MemoryPointer.new :pointer
            Regress::Lib.regress_test_array_fixed_out_objects _v1
            _v2 = GirFFI::SizedArray.wrap([:pointer, Regress::TestObj], 2, _v1.get_pointer(0))
            return _v2
          end
        CODE
      end
    end

    describe 'for functions having a linked length argument' do
      let(:function_info) { get_introspection_data 'Regress', 'test_array_gint16_in' }
      it 'builds a correct definition' do
        code.must_equal <<-CODE.reset_indentation
          def self.test_array_gint16_in(ints)
            n_ints = ints.nil? ? 0 : ints.length
            _v1 = n_ints
            _v2 = GirFFI::SizedArray.from(:gint16, -1, ints)
            _v3 = Regress::Lib.regress_test_array_gint16_in _v1, _v2
            return _v3
          end
        CODE
      end
    end

    describe 'for methods taking a zero-terminated array with length argument' do
      let(:function_info) { get_method_introspection_data 'Regress', 'AnnotationObject', 'parse_args' }
      it 'builds a correct definition' do
        skip unless function_info
        code.must_equal <<-CODE.reset_indentation
          def parse_args(argv)
            argc = argv.nil? ? 0 : argv.length
            _v1 = FFI::MemoryPointer.new :int32
            _v1.put_int32 0, argc
            _v2 = FFI::MemoryPointer.new :pointer
            _v2.put_pointer 0, GLib::Strv.from(argv)
            Regress::Lib.regress_annotation_object_parse_args self, _v1, _v2
            _v3 = GLib::Strv.wrap(_v2.get_pointer(0))
            return _v3
          end
        CODE
      end
    end

    describe 'for functions with callbacks' do
      let(:function_info) { get_introspection_data 'Regress', 'test_callback_destroy_notify' }
      it 'builds a correct definition' do
        code.must_equal <<-CODE.reset_indentation
          def self.test_callback_destroy_notify(&callback)
            _v1 = Regress::TestCallbackUserData.from(callback)
            _v2 = GirFFI::ArgHelper.store(_v1)
            _v3 = GLib::DestroyNotify.default
            _v4 = Regress::Lib.regress_test_callback_destroy_notify _v1, _v2, _v3
            return _v4
          end
        CODE
      end
    end

    describe 'for functions that take a GValue' do
      let(:function_info) { get_introspection_data 'GIMarshallingTests', 'gvalue_in' }
      it 'creates a call to GObject::Value#from' do
        code.must_equal <<-CODE.reset_indentation
          def self.gvalue_in(value)
            _v1 = GObject::Value.from(value)
            GIMarshallingTests::Lib.gi_marshalling_tests_gvalue_in _v1
          end
        CODE
      end
    end

    describe 'for functions that return a GValue' do
      let(:function_info) { get_introspection_data 'GIMarshallingTests', 'gvalue_return' }
      it 'creates a call to #get_value' do
        code.must_equal <<-CODE.reset_indentation
          def self.gvalue_return
            _v1 = GIMarshallingTests::Lib.gi_marshalling_tests_gvalue_return
            _v2 = GObject::Value.wrap(_v1).get_value
            return _v2
          end
        CODE
      end
    end

    describe 'for functions that have a GValue out argument' do
      let(:function_info) { get_introspection_data 'GIMarshallingTests', 'gvalue_out' }
      it 'creates a call to #get_value' do
        code.must_equal <<-CODE.reset_indentation
          def self.gvalue_out
            _v1 = FFI::MemoryPointer.new :pointer
            GIMarshallingTests::Lib.gi_marshalling_tests_gvalue_out _v1
            _v2 = GObject::Value.wrap(_v1.get_pointer(0)).get_value
            return _v2
          end
        CODE
      end
    end

    describe 'for functions that have a caller-allocated GValue out argument' do
      let(:function_info) { get_introspection_data 'GIMarshallingTests', 'gvalue_out_caller_allocates' }

      it 'creates a call to #get_value' do
        skip unless function_info
        code.must_equal <<-CODE.reset_indentation
          def self.gvalue_out_caller_allocates
            _v1 = GObject::Value.new
            GIMarshallingTests::Lib.gi_marshalling_tests_gvalue_out_caller_allocates _v1
            _v2 = _v1.get_value
            return _v2
          end
        CODE
      end
    end

    describe 'for functions with a nullable input array' do
      let(:function_info) { get_introspection_data 'Regress', 'test_array_int_null_in' }
      it 'builds correct definition' do
        code.must_equal <<-CODE.reset_indentation
          def self.test_array_int_null_in(arr = nil)
            len = arr.nil? ? 0 : arr.length
            _v1 = len
            _v2 = GirFFI::SizedArray.from(:gint32, -1, arr)
            Regress::Lib.regress_test_array_int_null_in _v2, _v1
          end
        CODE
      end
    end

    describe 'for functions with a nullable output array' do
      let(:function_info) { get_introspection_data 'Regress', 'test_array_int_null_out' }
      it 'builds correct definition' do
        code.must_equal <<-CODE.reset_indentation
          def self.test_array_int_null_out
            _v1 = FFI::MemoryPointer.new :int32
            _v2 = FFI::MemoryPointer.new :pointer
            Regress::Lib.regress_test_array_int_null_out _v2, _v1
            _v3 = _v1.get_int32(0)
            _v4 = GirFFI::SizedArray.wrap(:gint32, _v3, _v2.get_pointer(0))
            return _v4
          end
        CODE
      end
    end

    describe 'for a method with an inout array with size argument' do
      let(:function_info) { get_method_introspection_data 'GIMarshallingTests', 'Object', 'method_array_inout' }
      it 'builds the correct definition' do
        code.must_equal <<-CODE.reset_indentation
          def method_array_inout(ints)
            length = ints.nil? ? 0 : ints.length
            _v1 = FFI::MemoryPointer.new :int32
            _v1.put_int32 0, length
            _v2 = FFI::MemoryPointer.new :pointer
            _v2.put_pointer 0, GirFFI::SizedArray.from(:gint32, -1, ints)
            GIMarshallingTests::Lib.gi_marshalling_tests_object_method_array_inout self, _v2, _v1
            _v3 = _v1.get_int32(0)
            _v4 = GirFFI::SizedArray.wrap(:gint32, _v3, _v2.get_pointer(0))
            return _v4
          end
        CODE
      end
    end

    describe 'for a simple method' do
      let(:function_info) { get_method_introspection_data 'Regress', 'TestObj', 'instance_method' }

      it 'builds a correct definition' do
        code.must_equal <<-CODE.reset_indentation
          def instance_method
            _v1 = Regress::Lib.regress_test_obj_instance_method self
            return _v1
          end
        CODE
      end
    end

    describe 'for GLib::Variant.get_strv' do
      let(:function_info) { get_method_introspection_data 'GLib', 'Variant', 'get_strv' }
      it 'builds a correct definition' do
        size_type = ":uint#{FFI.type_size(:size_t) * 8}"
        code.must_equal <<-CODE.reset_indentation
          def get_strv
            _v1 = FFI::MemoryPointer.new #{size_type}
            _v2 = GLib::Lib.g_variant_get_strv self, _v1
            _v3 = GLib::Strv.wrap(_v2)
            return _v3
          end
        CODE
      end
    end

    describe 'for Regress.has_parameter_named_attrs' do
      let(:function_info) { get_introspection_data 'Regress', 'has_parameter_named_attrs' }

      it 'builds a correct definition' do
        skip unless function_info
        code.must_equal <<-CODE.reset_indentation
          def self.has_parameter_named_attrs(foo, attributes)
            _v1 = foo
            GirFFI::ArgHelper.check_fixed_array_size 32, attributes, \"attributes\"
            _v2 = GirFFI::SizedArray.from([:pointer, :guint32], 32, attributes)
            Regress::Lib.regress_has_parameter_named_attrs _v1, _v2
          end
        CODE
      end
    end

    describe 'for GIMarshallingTests::Object#method_int8_arg_and_out_callee' do
      let(:function_info) do
        get_method_introspection_data('GIMarshallingTests', 'Object',
                                      'method_int8_arg_and_out_callee')
      end

      it 'builds a correct definition' do
        skip unless function_info
        code.must_equal <<-CODE.reset_indentation
          def method_int8_arg_and_out_callee(arg)
            _v1 = arg
            _v2 = FFI::MemoryPointer.new :pointer
            GIMarshallingTests::Lib.gi_marshalling_tests_object_method_int8_arg_and_out_callee self, _v1, _v2
            _v3 = _v2.get_pointer(0).get_int8(0)
            return _v3
          end
        CODE
      end
    end

    describe 'object ownership transfer' do
      describe 'for GIMarshallingTests::Object#full_in' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'Object',
                                        'full_in')
        end

        # NOTE: This method is transfer-ownership: none, despite the name.
        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def full_in
            GIMarshallingTests::Lib.gi_marshalling_tests_object_full_in self
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::Object.full_inout' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'Object',
                                        'full_inout')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.full_inout(object)
            _v1 = FFI::MemoryPointer.new :pointer
            _v1.put_pointer 0, GIMarshallingTests::Object.from(object.ref)
            GIMarshallingTests::Lib.gi_marshalling_tests_object_full_inout _v1
            _v2 = GIMarshallingTests::Object.wrap(_v1.get_pointer(0))
            return _v2
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::Object.full_out' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'Object',
                                        'full_out')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.full_out
            _v1 = FFI::MemoryPointer.new :pointer
            GIMarshallingTests::Lib.gi_marshalling_tests_object_full_out _v1
            _v2 = GIMarshallingTests::Object.wrap(_v1.get_pointer(0))
            return _v2
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::Object.full_return' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'Object',
                                        'full_return')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.full_return
            _v1 = GIMarshallingTests::Lib.gi_marshalling_tests_object_full_return
            _v2 = GIMarshallingTests::Object.wrap(_v1)
            return _v2
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::Object#none_in' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'Object',
                                        'none_in')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def none_in
            GIMarshallingTests::Lib.gi_marshalling_tests_object_none_in self
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::Object.none_inout' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'Object',
                                        'none_inout')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.none_inout(object)
            _v1 = FFI::MemoryPointer.new :pointer
            _v1.put_pointer 0, GIMarshallingTests::Object.from(object)
            GIMarshallingTests::Lib.gi_marshalling_tests_object_none_inout _v1
            _v2 = GIMarshallingTests::Object.wrap(_v1.get_pointer(0)).tap { |it| it && it.ref }
            return _v2
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::Object.none_out' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'Object',
                                        'none_out')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.none_out
            _v1 = FFI::MemoryPointer.new :pointer
            GIMarshallingTests::Lib.gi_marshalling_tests_object_none_out _v1
            _v2 = GIMarshallingTests::Object.wrap(_v1.get_pointer(0)).tap { |it| it && it.ref }
            return _v2
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::Object.none_return' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'Object',
                                        'none_return')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.none_return
            _v1 = GIMarshallingTests::Lib.gi_marshalling_tests_object_none_return
            _v2 = GIMarshallingTests::Object.wrap(_v1).tap { |it| it && it.ref }
            return _v2
          end
          CODE
        end
      end

      describe 'for Regress::TestObj#instance_method_full' do
        let(:function_info) do
          get_method_introspection_data('Regress', 'TestObj',
                                        'instance_method_full')
        end

        it 'builds a correct definition including self.ref' do
          skip unless function_info
          code.must_equal <<-CODE.reset_indentation
          def instance_method_full
            Regress::Lib.regress_test_obj_instance_method_full self.ref
          end
          CODE
        end
      end
    end

    describe 'struct ownership transfer' do
      describe 'for GIMarshallingTests::BoxedStruct.inout' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'BoxedStruct', 'inout')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.inout(struct_)
            _v1 = FFI::MemoryPointer.new :pointer
            _v1.put_pointer 0, GIMarshallingTests::BoxedStruct.copy_from(struct_)
            GIMarshallingTests::Lib.gi_marshalling_tests_boxed_struct_inout _v1
            _v2 = GIMarshallingTests::BoxedStruct.wrap_own(_v1.get_pointer(0))
            return _v2
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::BoxedStruct.out' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'BoxedStruct', 'out')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.out
            _v1 = FFI::MemoryPointer.new :pointer
            GIMarshallingTests::Lib.gi_marshalling_tests_boxed_struct_out _v1
            _v2 = GIMarshallingTests::BoxedStruct.wrap_copy(_v1.get_pointer(0))
            return _v2
          end
          CODE
        end
      end

      describe 'for GIMarshallingTests::BoxedStruct.returnv' do
        let(:function_info) do
          get_method_introspection_data('GIMarshallingTests', 'BoxedStruct', 'returnv')
        end

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.returnv
            _v1 = GIMarshallingTests::Lib.gi_marshalling_tests_boxed_struct_returnv
            _v2 = GIMarshallingTests::BoxedStruct.wrap_copy(_v1)
            return _v2
          end
          CODE
        end
      end
    end

    describe 'string ownership transfer' do
      describe 'for Regress.test_utf8_out' do
        let(:function_info) { get_introspection_data 'Regress', 'test_utf8_out' }

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
          def self.test_utf8_out
            _v1 = FFI::MemoryPointer.new :pointer
            Regress::Lib.regress_test_utf8_out _v1
            _v2 = GirFFI::AllocationHelper.free_after _v1.get_pointer(0), &:to_utf8
            return _v2
          end
          CODE
        end
      end
    end

    describe 'for functions with an allow-none ingoing parameter' do
      let(:function_info) { get_introspection_data 'Regress', 'test_utf8_null_in' }
      it 'builds correct definition with default parameter value' do
        code.must_equal <<-CODE.reset_indentation
          def self.test_utf8_null_in(in_ = nil)
            _v1 = GirFFI::InPointer.from_utf8(in_)
            Regress::Lib.regress_test_utf8_null_in _v1
          end
        CODE
      end
    end

    describe 'for functions where some allow-none cannot be honored' do
      let(:function_info) { get_method_introspection_data 'GObject', 'Closure', 'invoke' }
      it 'builds correct definition with default parameter value on the later arguments' do
        code.must_equal <<-CODE.reset_indentation
          def invoke(return_value, param_values, invocation_hint = nil)
            _v1 = GObject::Value.from(return_value)
            n_param_values = param_values.nil? ? 0 : param_values.length
            _v2 = n_param_values
            _v3 = invocation_hint
            _v4 = GirFFI::SizedArray.from(GObject::Value, -1, param_values)
            GObject::Lib.g_closure_invoke self, _v1, _v2, _v4, _v3
          end
        CODE
      end
    end

    describe 'ownership transfer for an ingoing array of structs' do
      describe 'with no ownership transfer of the elements' do
        let(:function_info) { get_introspection_data 'GIMarshallingTests', 'array_struct_in' }

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
            def self.array_struct_in(structs)
              length = structs.nil? ? 0 : structs.length
              _v1 = length
              _v2 = GirFFI::SizedArray.from([:pointer, GIMarshallingTests::BoxedStruct], -1, structs)
              GIMarshallingTests::Lib.gi_marshalling_tests_array_struct_in _v2, _v1
            end
          CODE
        end
      end
      describe 'with ownership transfer of the elements' do
        let(:function_info) { get_introspection_data 'GIMarshallingTests', 'array_struct_take_in' }

        it 'builds a correct definition' do
          code.must_equal <<-CODE.reset_indentation
            def self.array_struct_take_in(structs)
              length = structs.nil? ? 0 : structs.length
              _v1 = length
              _v2 = GirFFI::SizedArray.copy_from([:pointer, GIMarshallingTests::BoxedStruct], -1, structs)
              GIMarshallingTests::Lib.gi_marshalling_tests_array_struct_take_in _v2, _v1
            end
          CODE
        end
      end
    end
  end
end