// 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/type_manager.h"

#include "gtest/gtest.h"
#include "src/ast/type/i32_type.h"
#include "src/ast/type/u32_type.h"

namespace tint {

using TypeManagerTest = testing::Test;

TEST_F(TypeManagerTest, Singleton) {
  auto tm = TypeManager::Instance();
  ASSERT_NE(tm, nullptr);
  ASSERT_EQ(tm, TypeManager::Instance());

  TypeManager::Destroy();
}

TEST_F(TypeManagerTest, Destroy) {
  auto tm = TypeManager::Instance();
  ASSERT_NE(tm, nullptr);
  ASSERT_EQ(tm, TypeManager::Instance());

  TypeManager::Destroy();

  tm = TypeManager::Instance();
  ASSERT_NE(tm, nullptr);

  TypeManager::Destroy();
}

TEST_F(TypeManagerTest, GetUnregistered) {
  auto tm = TypeManager::Instance();
  auto t = tm->Get(std::make_unique<ast::type::I32Type>());
  ASSERT_NE(t, nullptr);
  EXPECT_TRUE(t->IsI32());

  TypeManager::Destroy();
}

TEST_F(TypeManagerTest, GetSameTypeReturnsSamePtr) {
  auto tm = TypeManager::Instance();
  auto t = tm->Get(std::make_unique<ast::type::I32Type>());
  ASSERT_NE(t, nullptr);
  EXPECT_TRUE(t->IsI32());

  auto t2 = tm->Get(std::make_unique<ast::type::I32Type>());
  EXPECT_EQ(t, t2);

  TypeManager::Destroy();
}

TEST_F(TypeManagerTest, GetDifferentTypeReturnsDifferentPtr) {
  auto tm = TypeManager::Instance();
  auto t = tm->Get(std::make_unique<ast::type::I32Type>());
  ASSERT_NE(t, nullptr);
  EXPECT_TRUE(t->IsI32());

  auto t2 = tm->Get(std::make_unique<ast::type::U32Type>());
  ASSERT_NE(t2, nullptr);
  EXPECT_NE(t, t2);
  EXPECT_TRUE(t2->IsU32());

  TypeManager::Destroy();
}

}  // namespace tint