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#include "src/tint/lang/msl/writer/helper_test.h"

using namespace tint::core::number_suffixes;  // NOLINT

namespace tint::msl::writer {
namespace {

TEST_F(MslWriterTest, Return) {
    auto* func = b.ComputeFunction("entry");
    b.Append(func->Block(), [&] {
        auto* if_ = b.If(true);
        b.Append(if_->True(), [&] { b.Return(func); });
        b.Return(func);
    });

    auto result = Generate();
    ASSERT_EQ(result, Success) << result.Failure() << output_.msl;
    EXPECT_EQ(output_.msl, MetalHeader() + R"(
[[max_total_threads_per_threadgroup(1)]]
kernel void entry() {
  if (true) {
    return;
  }
}
)");
}

TEST_F(MslWriterTest, ReturnAtEndOfVoidDropped) {
    auto* func = b.ComputeFunction("entry");
    func->Block()->Append(b.Return(func));

    auto result = Generate();
    ASSERT_EQ(result, Success) << result.Failure() << output_.msl;
    EXPECT_EQ(output_.msl, MetalHeader() + R"(
[[max_total_threads_per_threadgroup(1)]]
kernel void entry() {
}
)");
}

TEST_F(MslWriterTest, ReturnWithValue) {
    auto* func = b.Function("foo", ty.i32());
    func->Block()->Append(b.Return(func, 123_i));

    auto* eb = b.ComputeFunction("entry");
    b.Append(eb->Block(), [&] {
        b.Let("x", b.Call(func));
        b.Return(eb);
    });

    auto result = Generate();
    ASSERT_EQ(result, Success) << result.Failure() << output_.msl;
    EXPECT_EQ(output_.msl, MetalHeader() + R"(
int foo() {
  return 123;
}

[[max_total_threads_per_threadgroup(1)]]
kernel void entry() {
  int const x = foo();
}
)");
}

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