// Copyright 2023 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 "gmock/gmock.h"
#include "gtest/gtest-spi.h"
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/instruction.h"
#include "src/tint/lang/core/ir/ir_helper_test.h"

namespace tint::core::ir {
namespace {

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

using IR_LoadVectorElementTest = IRTestHelper;

TEST_F(IR_LoadVectorElementTest, Create) {
    auto* from = b.Var(ty.ptr<private_, vec3<i32>>());
    auto* inst = b.LoadVectorElement(from, 2_i);

    ASSERT_TRUE(inst->Is<LoadVectorElement>());
    ASSERT_EQ(inst->From(), from->Result());

    ASSERT_TRUE(inst->Index()->Is<Constant>());
    auto index = inst->Index()->As<Constant>()->Value();
    ASSERT_TRUE(index->Is<core::constant::Scalar<i32>>());
    EXPECT_EQ(2_i, index->As<core::constant::Scalar<i32>>()->ValueAs<i32>());
}

TEST_F(IR_LoadVectorElementTest, Usage) {
    auto* from = b.Var(ty.ptr<private_, vec3<i32>>());
    auto* inst = b.LoadVectorElement(from, 2_i);

    ASSERT_NE(inst->From(), nullptr);
    EXPECT_THAT(inst->From()->Usages(), testing::UnorderedElementsAre(Usage{inst, 0u}));

    ASSERT_NE(inst->Index(), nullptr);
    EXPECT_THAT(inst->Index()->Usages(), testing::UnorderedElementsAre(Usage{inst, 1u}));
}

TEST_F(IR_LoadVectorElementTest, Result) {
    auto* from = b.Var(ty.ptr<private_, vec3<i32>>());
    auto* inst = b.LoadVectorElement(from, 2_i);

    EXPECT_TRUE(inst->HasResults());
    EXPECT_FALSE(inst->HasMultiResults());
}

}  // namespace
}  // namespace tint::core::ir