// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "src/ast/struct.h"
#include "src/ast/struct_member.h"
#include "src/ast/struct_member_decoration.h"
#include "src/ast/struct_member_offset_decoration.h"
#include "src/ast/type/f32_type.h"
#include "src/ast/type/i32_type.h"
#include "src/ast/type/struct_type.h"
#include "src/writer/hlsl/test_helper.h"

namespace tint {
namespace writer {
namespace hlsl {
namespace {

using HlslGeneratorImplTest_Alias = TestHelper;

TEST_F(HlslGeneratorImplTest_Alias, EmitAlias_F32) {
  ast::type::F32 f32;
  ast::type::Alias alias(mod.RegisterSymbol("a"), "a", &f32);

  ASSERT_TRUE(gen.EmitConstructedType(out, &alias)) << gen.error();
  EXPECT_EQ(result(), R"(typedef float a;
)");
}

TEST_F(HlslGeneratorImplTest_Alias, EmitAlias_NameCollision) {
  ast::type::F32 f32;
  ast::type::Alias alias(mod.RegisterSymbol("float"), "float", &f32);

  ASSERT_TRUE(gen.EmitConstructedType(out, &alias)) << gen.error();
  EXPECT_EQ(result(), R"(typedef float float_tint_0;
)");
}

TEST_F(HlslGeneratorImplTest_Alias, EmitAlias_Struct) {
  ast::type::I32 i32;
  ast::type::F32 f32;

  auto* str = create<ast::Struct>(
      Source{},
      ast::StructMemberList{
          create<ast::StructMember>(Source{}, "a", &f32,
                                    ast::StructMemberDecorationList{}),
          create<ast::StructMember>(
              Source{}, "b", &i32,
              ast::StructMemberDecorationList{
                  create<ast::StructMemberOffsetDecoration>(4, Source{})}),
      },
      ast::StructDecorationList{});

  ast::type::Struct s(mod.RegisterSymbol("A"), "A", str);
  ast::type::Alias alias(mod.RegisterSymbol("B"), "B", &s);

  ASSERT_TRUE(gen.EmitConstructedType(out, &alias)) << gen.error();
  EXPECT_EQ(result(), R"(struct B {
  float a;
  int b;
};
)");
}

}  // namespace
}  // namespace hlsl
}  // namespace writer
}  // namespace tint