// Copyright 2023 The Dawn & Tint Authors
//
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// 1. Redistributions of source code must retain the above copyright notice, this
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//    this list of conditions and the following disclaimer in the documentation
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#include "src/tint/lang/core/ir/function.h"

#include <string>

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

namespace tint::core::ir {
namespace {

using namespace tint::core::number_suffixes;  // NOLINT
using IR_FunctionTest = IRTestHelper;
using IR_FunctionDeathTest = IR_FunctionTest;

TEST_F(IR_FunctionDeathTest, Fail_NullReturnType) {
    EXPECT_DEATH_IF_SUPPORTED(
        {
            Module mod;
            Builder b{mod};
            b.Function("my_func", nullptr);
        },
        "internal compiler error");
}

TEST_F(IR_FunctionDeathTest, Fail_DoubleReturnBuiltin) {
    EXPECT_DEATH_IF_SUPPORTED(
        {
            Module mod;
            Builder b{mod};
            auto* f = b.Function("my_func", mod.Types().void_());
            f->SetReturnBuiltin(BuiltinValue::kFragDepth);
            f->SetReturnBuiltin(BuiltinValue::kPosition);
        },
        "internal compiler error");
}

TEST_F(IR_FunctionDeathTest, Fail_NullParam) {
    EXPECT_DEATH_IF_SUPPORTED(
        {
            Module mod;
            Builder b{mod};
            auto* f = b.Function("my_func", mod.Types().void_());
            f->SetParams({nullptr});
        },
        "internal compiler error");
}

TEST_F(IR_FunctionDeathTest, Fail_NullBlock) {
    EXPECT_DEATH_IF_SUPPORTED(
        {
            Module mod;
            Builder b{mod};
            auto* f = b.Function("my_func", mod.Types().void_());
            f->SetBlock(nullptr);
        },
        "internal compiler error");
}

TEST_F(IR_FunctionTest, Clone) {
    auto* f = b.ComputeFunction("my_func", 2_u, 3_u, 4_u);
    f->SetReturnBuiltin(BuiltinValue::kFragDepth);
    f->SetReturnLocation(1);
    f->SetReturnInterpolation(
        Interpolation{core::InterpolationType::kFlat, core::InterpolationSampling::kCentroid});
    f->SetReturnInvariant(true);

    auto* param1 = b.FunctionParam("a", mod.Types().i32());
    auto* param2 = b.FunctionParam("b", mod.Types().f32());
    f->SetParams({param1, param2});

    auto* new_param1 = clone_ctx.Clone(param1);
    auto* new_param2 = clone_ctx.Clone(param2);
    auto* new_f = clone_ctx.Clone(f);

    EXPECT_NE(f, new_f);
    EXPECT_EQ(std::string("my_func"), mod.NameOf(new_f).Name());

    EXPECT_EQ(Function::PipelineStage::kCompute, new_f->Stage());
    EXPECT_TRUE(new_f->WorkgroupSize().has_value());
    auto wg = new_f->WorkgroupSizeAsConst().value();
    EXPECT_EQ(2u, wg[0]);
    EXPECT_EQ(3u, wg[1]);
    EXPECT_EQ(4u, wg[2]);

    EXPECT_EQ(mod.Types().void_(), new_f->ReturnType());

    EXPECT_TRUE(new_f->ReturnBuiltin().has_value());
    EXPECT_EQ(BuiltinValue::kFragDepth, new_f->ReturnBuiltin().value());

    EXPECT_EQ(new_f->ReturnLocation(), 1u);
    auto interp = new_f->ReturnInterpolation();
    EXPECT_TRUE(interp.has_value());
    EXPECT_EQ(interp->type, core::InterpolationType::kFlat);
    EXPECT_EQ(interp->sampling, core::InterpolationSampling::kCentroid);

    EXPECT_TRUE(new_f->ReturnInvariant());

    EXPECT_EQ(2u, new_f->Params().Length());
    EXPECT_EQ(new_param1, new_f->Params()[0]);
    EXPECT_EQ(new_param2, new_f->Params()[1]);

    // Cloned functions are not automatically added to the module.
    EXPECT_EQ(mod.functions.Length(), 1u);

    // Check parameter ownership is correct.
    EXPECT_EQ(param1->Function(), f);
    EXPECT_EQ(param2->Function(), f);
    EXPECT_EQ(new_param1->Function(), new_f);
    EXPECT_EQ(new_param2->Function(), new_f);
}

TEST_F(IR_FunctionTest, CloneWithExits) {
    auto* f = b.Function("my_func", mod.Types().void_());
    b.Append(f->Block(), [&] { b.Return(f); });

    auto* new_f = clone_ctx.Clone(f);
    EXPECT_EQ(1u, new_f->Block()->Length());
    EXPECT_TRUE(new_f->Block()->Front()->Is<Return>());
    EXPECT_EQ(new_f, new_f->Block()->Front()->As<Return>()->Func());
}

TEST_F(IR_FunctionTest, CloneWithoutName) {
    auto* f = b.Function(mod.Types().void_());
    b.Append(f->Block(), [&] { b.Return(f); });

    auto* new_f = clone_ctx.Clone(f);
    EXPECT_FALSE(mod.NameOf(new_f).IsValid());
}

TEST_F(IR_FunctionTest, Parameters) {
    auto* f = b.Function("my_func", mod.Types().void_());

    auto* param1 = b.FunctionParam("a", mod.Types().i32());
    auto* param2 = b.FunctionParam("b", mod.Types().f32());
    auto* param3 = b.FunctionParam("b", mod.Types().f32());

    f->SetParams({param1, param2});
    EXPECT_EQ(param1->Function(), f);
    EXPECT_EQ(param2->Function(), f);
    EXPECT_EQ(param3->Function(), nullptr);
    EXPECT_EQ(param1->Index(), 0u);
    EXPECT_EQ(param2->Index(), 1u);

    f->SetParams({param1, param3});
    EXPECT_EQ(param1->Function(), f);
    EXPECT_EQ(param2->Function(), nullptr);
    EXPECT_EQ(param3->Function(), f);
    EXPECT_EQ(param1->Index(), 0u);
    EXPECT_EQ(param3->Index(), 1u);

    f->AppendParam(param2);
    EXPECT_EQ(param1->Function(), f);
    EXPECT_EQ(param2->Function(), f);
    EXPECT_EQ(param3->Function(), f);
    EXPECT_EQ(param1->Index(), 0u);
    EXPECT_EQ(param3->Index(), 1u);
    EXPECT_EQ(param2->Index(), 2u);
}

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