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

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

namespace tint::core::ir {
namespace {

using IR_ValueTest = IRTestHelper;

TEST_F(IR_ValueTest, ReplaceAllUsesWith_Value) {
    auto* val_old = b.InstructionResult(ty.i32());
    auto* val_new = b.InstructionResult(ty.i32());
    auto* inst = b.Add(mod.Types().i32(), val_old, 1_i);
    EXPECT_EQ(inst->LHS(), val_old);
    val_old->ReplaceAllUsesWith(val_new);
    EXPECT_EQ(inst->LHS(), val_new);
}

TEST_F(IR_ValueTest, ReplaceAllUsesWith_Fn) {
    auto* val_old = b.InstructionResult(ty.i32());
    auto* val_new = b.InstructionResult(ty.i32());
    auto* inst = b.Add(mod.Types().i32(), val_old, 1_i);
    EXPECT_EQ(inst->LHS(), val_old);
    val_old->ReplaceAllUsesWith([&](Usage use) {
        EXPECT_EQ(use.instruction, inst);
        EXPECT_EQ(use.operand_index, 0u);
        return val_new;
    });
    EXPECT_EQ(inst->LHS(), val_new);
}

TEST_F(IR_ValueTest, Destroy) {
    auto* val = b.InstructionResult(ty.i32());
    EXPECT_TRUE(val->Alive());
    val->Destroy();
    EXPECT_FALSE(val->Alive());
}

TEST_F(IR_ValueTest, Destroy_HasSource) {
    EXPECT_FATAL_FAILURE(
        {
            Module mod;
            Builder b{mod};
            auto* val = b.Add(mod.Types().i32(), 1_i, 2_i)->Result(0);
            val->Destroy();
        },
        "");
}

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