// 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/tint/writer/msl/test_helper.h"

namespace tint {
namespace writer {
namespace msl {
namespace {

using MslUnaryOpTest = TestHelper;

TEST_F(MslUnaryOpTest, AddressOf) {
  Global("expr", ty.f32(), ast::StorageClass::kPrivate);
  auto* op =
      create<ast::UnaryOpExpression>(ast::UnaryOp::kAddressOf, Expr("expr"));
  WrapInFunction(op);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.error();
  EXPECT_EQ(out.str(), "&(expr)");
}

TEST_F(MslUnaryOpTest, Complement) {
  Global("expr", ty.i32(), ast::StorageClass::kPrivate);
  auto* op =
      create<ast::UnaryOpExpression>(ast::UnaryOp::kComplement, Expr("expr"));
  WrapInFunction(op);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.error();
  EXPECT_EQ(out.str(), "~(expr)");
}

TEST_F(MslUnaryOpTest, Indirection) {
  Global("G", ty.f32(), ast::StorageClass::kPrivate);
  auto* p = Const(
      "expr", nullptr,
      create<ast::UnaryOpExpression>(ast::UnaryOp::kAddressOf, Expr("G")));
  auto* op =
      create<ast::UnaryOpExpression>(ast::UnaryOp::kIndirection, Expr("expr"));
  WrapInFunction(p, op);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.error();
  EXPECT_EQ(out.str(), "*(expr)");
}

TEST_F(MslUnaryOpTest, Not) {
  Global("expr", ty.bool_(), ast::StorageClass::kPrivate);
  auto* op = create<ast::UnaryOpExpression>(ast::UnaryOp::kNot, Expr("expr"));
  WrapInFunction(op);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.error();
  EXPECT_EQ(out.str(), "!(expr)");
}

TEST_F(MslUnaryOpTest, Negation) {
  Global("expr", ty.i32(), ast::StorageClass::kPrivate);
  auto* op =
      create<ast::UnaryOpExpression>(ast::UnaryOp::kNegation, Expr("expr"));
  WrapInFunction(op);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.error();
  EXPECT_EQ(out.str(), "tint_unary_minus(expr)");
}

TEST_F(MslUnaryOpTest, NegationOfIntMin) {
  auto* op = create<ast::UnaryOpExpression>(
      ast::UnaryOp::kNegation, Expr(std::numeric_limits<int32_t>::min()));
  WrapInFunction(op);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitExpression(out, op)) << gen.error();
  EXPECT_EQ(out.str(), "tint_unary_minus((-2147483647 - 1))");
}

}  // namespace
}  // namespace msl
}  // namespace writer
}  // namespace tint