// Copyright 2021 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/transform/add_empty_entry_point.h"

#include <utility>

#include "src/transform/test_helper.h"

namespace tint {
namespace transform {
namespace {

using AddEmptyEntryPointTest = TransformTest;

TEST_F(AddEmptyEntryPointTest, ShouldRunEmptyModule) {
  auto* src = R"()";

  EXPECT_TRUE(ShouldRun<AddEmptyEntryPoint>(src));
}

TEST_F(AddEmptyEntryPointTest, ShouldRunExistingEntryPoint) {
  auto* src = R"(
[[stage(compute), workgroup_size(1)]]
fn existing() {}
)";

  EXPECT_FALSE(ShouldRun<AddEmptyEntryPoint>(src));
}

TEST_F(AddEmptyEntryPointTest, EmptyModule) {
  auto* src = R"()";

  auto* expect = R"(
@stage(compute) @workgroup_size(1)
fn unused_entry_point() {
}
)";

  auto got = Run<AddEmptyEntryPoint>(src);

  EXPECT_EQ(expect, str(got));
}

TEST_F(AddEmptyEntryPointTest, ExistingEntryPoint) {
  auto* src = R"(
@stage(fragment)
fn main() {
}
)";

  auto* expect = src;

  auto got = Run<AddEmptyEntryPoint>(src);

  EXPECT_EQ(expect, str(got));
}

TEST_F(AddEmptyEntryPointTest, NameClash) {
  auto* src = R"(var<private> unused_entry_point : f32;)";

  auto* expect = R"(
@stage(compute) @workgroup_size(1)
fn unused_entry_point_1() {
}

var<private> unused_entry_point : f32;
)";

  auto got = Run<AddEmptyEntryPoint>(src);

  EXPECT_EQ(expect, str(got));
}

}  // namespace
}  // namespace transform
}  // namespace tint