// 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/spirv/spv_dump.h"
#include "src/tint/writer/spirv/test_helper.h"

using namespace tint::number_suffixes;  // NOLINT

namespace tint::writer::spirv {
namespace {

using BuilderTest = TestHelper;

TEST_F(BuilderTest, Return) {
    auto* ret = Return();
    WrapInFunction(ret);

    spirv::Builder& b = Build();

    b.PushFunctionForTesting();
    EXPECT_TRUE(b.GenerateReturnStatement(ret));
    ASSERT_FALSE(b.has_error()) << b.Diagnostics();

    EXPECT_EQ(DumpInstructions(b.CurrentFunction().instructions()), R"(OpReturn
)");
}

TEST_F(BuilderTest, Return_WithValue) {
    auto* val = vec3<f32>(1_f, 1_f, 3_f);

    auto* ret = Return(val);
    Func("test", utils::Empty, ty.vec3<f32>(), utils::Vector{ret}, utils::Empty);

    spirv::Builder& b = Build();

    b.PushFunctionForTesting();
    EXPECT_TRUE(b.GenerateReturnStatement(ret));
    ASSERT_FALSE(b.has_error()) << b.Diagnostics();

    EXPECT_EQ(DumpInstructions(b.Module().Types()), R"(%2 = OpTypeFloat 32
%1 = OpTypeVector %2 3
%3 = OpConstant %2 1
%4 = OpConstant %2 3
%5 = OpConstantComposite %1 %3 %3 %4
)");
    EXPECT_EQ(DumpInstructions(b.CurrentFunction().instructions()),
              R"(OpReturnValue %5
)");
}

TEST_F(BuilderTest, Return_WithValue_GeneratesLoad) {
    auto* var = Var("param", ty.f32());

    auto* ret = Return(var);
    Func("test", utils::Empty, ty.f32(), utils::Vector{Decl(var), ret}, utils::Empty);

    spirv::Builder& b = Build();

    b.PushFunctionForTesting();
    EXPECT_TRUE(b.GenerateFunctionVariable(var)) << b.Diagnostics();
    EXPECT_TRUE(b.GenerateReturnStatement(ret)) << b.Diagnostics();
    ASSERT_FALSE(b.has_error()) << b.Diagnostics();

    EXPECT_EQ(DumpInstructions(b.Module().Types()), R"(%3 = OpTypeFloat 32
%2 = OpTypePointer Function %3
%4 = OpConstantNull %3
)");
    EXPECT_EQ(DumpInstructions(b.CurrentFunction().variables()),
              R"(%1 = OpVariable %2 Function %4
)");
    EXPECT_EQ(DumpInstructions(b.CurrentFunction().instructions()),
              R"(%5 = OpLoad %3 %1
OpReturnValue %5
)");
}

}  // namespace
}  // namespace tint::writer::spirv