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#include "src/tint/lang/wgsl/ast/transform/add_empty_entry_point.h"

#include <utility>

#include "src/tint/lang/wgsl/ast/transform/helper_test.h"

namespace tint::ast::transform {
namespace {

using AddEmptyEntryPointTest = TransformTest;

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

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

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

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

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

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

    auto got = Run<AddEmptyEntryPoint>(src);

    EXPECT_EQ(expect, str(got));
}

TEST_F(AddEmptyEntryPointTest, ExistingEntryPoint) {
    auto* src = R"(
@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"(
@compute @workgroup_size(1i)
fn unused_entry_point_1() {
}

var<private> unused_entry_point : f32;
)";

    auto got = Run<AddEmptyEntryPoint>(src);

    EXPECT_EQ(expect, str(got));
}

}  // namespace
}  // namespace tint::ast::transform