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#include "src/tint/lang/core/ir/next_iteration.h"

#include "src/tint/lang/core/ir/ir_helper_test.h"

namespace tint::core::ir {
namespace {

using namespace tint::core::number_suffixes;  // NOLINT
using IR_NextIterationTest = IRTestHelper;
using IR_NextIterationDeathTest = IR_NextIterationTest;

TEST_F(IR_NextIterationDeathTest, Fail_NullLoop) {
    EXPECT_DEATH_IF_SUPPORTED(
        {
            Module mod;
            Builder b{mod};
            b.NextIteration(nullptr);
        },
        "internal compiler error");
}

TEST_F(IR_NextIterationTest, Result) {
    auto* inst = b.NextIteration(b.Loop());

    EXPECT_TRUE(inst->Results().IsEmpty());
}

TEST_F(IR_NextIterationTest, Clone) {
    auto* arg1 = b.Constant(1_u);
    auto* arg2 = b.Constant(2_u);

    auto* loop = b.Loop();
    auto* inst = b.NextIteration(loop, arg1, arg2);

    auto* new_loop = clone_ctx.Clone(loop);
    auto* new_inst = clone_ctx.Clone(inst);

    EXPECT_NE(inst, new_inst);
    EXPECT_EQ(new_loop, new_inst->Loop());

    auto args = new_inst->Args();
    EXPECT_EQ(2u, args.size());

    auto* val0 = args[0]->As<Constant>()->Value();
    EXPECT_EQ(1_u, val0->As<core::constant::Scalar<u32>>()->ValueAs<u32>());

    auto* val1 = args[1]->As<Constant>()->Value();
    EXPECT_EQ(2_u, val1->As<core::constant::Scalar<u32>>()->ValueAs<u32>());
}

TEST_F(IR_NextIterationTest, CloneNoArgs) {
    auto* loop = b.Loop();
    auto* inst = b.NextIteration(loop);

    auto* new_loop = clone_ctx.Clone(loop);
    auto* new_inst = clone_ctx.Clone(inst);

    EXPECT_EQ(new_loop, new_inst->Loop());
}

TEST_F(IR_NextIterationTest, Destroy) {
    auto* loop = b.Loop();
    auto* inst = b.NextIteration(loop);

    ASSERT_EQ(1u, loop->Body()->InboundSiblingBranches().Length());
    EXPECT_EQ(inst, loop->Body()->InboundSiblingBranches()[0]);

    inst->Destroy();

    EXPECT_EQ(0u, loop->Body()->InboundSiblingBranches().Length());
}

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