// 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 "gmock/gmock.h"
#include "src/tint/writer/hlsl/test_helper.h"

namespace tint::writer::hlsl {
namespace {

using ::testing::HasSubstr;
using namespace tint::builtin::fluent_types;  // NOLINT
using namespace tint::number_suffixes;        // NOLINT

using HlslGeneratorImplTest_Constructor = TestHelper;

TEST_F(HlslGeneratorImplTest_Constructor, Bool) {
    WrapInFunction(Expr(false));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("false"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Int) {
    WrapInFunction(Expr(-12345_i));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("-12345"));
}

TEST_F(HlslGeneratorImplTest_Constructor, UInt) {
    WrapInFunction(Expr(56779_u));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("56779u"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Float) {
    // Use a number close to 1<<30 but whose decimal representation ends in 0.
    WrapInFunction(Expr(f32((1 << 30) - 4)));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("1073741824.0f"));
}

TEST_F(HlslGeneratorImplTest_Constructor, F16) {
    Enable(builtin::Extension::kF16);

    // Use a number close to 1<<16 but whose decimal representation ends in 0.
    WrapInFunction(Expr(f16((1 << 15) - 8)));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("float16_t(32752.0h)"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Float) {
    WrapInFunction(Call<f32>(-1.2e-5_f));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("-0.00001200000042445026f"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_F16) {
    Enable(builtin::Extension::kF16);

    WrapInFunction(Call<f16>(-1.2e-3_h));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("float16_t(-0.0011997222900390625h)"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Bool) {
    WrapInFunction(Call<bool>(true));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("true"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Int) {
    WrapInFunction(Call<i32>(-12345_i));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("-12345"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Uint) {
    WrapInFunction(Call<u32>(12345_u));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("12345u"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_F32) {
    WrapInFunction(Call<vec3<f32>>(1_f, 2_f, 3_f));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("float3(1.0f, 2.0f, 3.0f)"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_F16) {
    Enable(builtin::Extension::kF16);

    WrapInFunction(Call<vec3<f16>>(1_h, 2_h, 3_h));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(
        gen.result(),
        HasSubstr("vector<float16_t, 3>(float16_t(1.0h), float16_t(2.0h), float16_t(3.0h))"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_Empty_F32) {
    WrapInFunction(Call<vec3<f32>>());

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("0.0f).xxx"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_Empty_F16) {
    Enable(builtin::Extension::kF16);

    WrapInFunction(Call<vec3<f16>>());

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("(float16_t(0.0h)).xxx"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_SingleScalar_F32_Literal) {
    WrapInFunction(Call<vec3<f32>>(2_f));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("2.0f).xxx"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_SingleScalar_F16_Literal) {
    Enable(builtin::Extension::kF16);

    WrapInFunction(Call<vec3<f16>>(2_h));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("(float16_t(2.0h)).xxx"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_SingleScalar_F32_Var) {
    auto* var = Var("v", Expr(2_f));
    auto* cast = Call<vec3<f32>>(var);
    WrapInFunction(var, cast);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr(R"(float v = 2.0f;
  const float3 tint_symbol = float3((v).xxx);)"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_SingleScalar_F16_Var) {
    Enable(builtin::Extension::kF16);

    auto* var = Var("v", Expr(2_h));
    auto* cast = Call<vec3<f16>>(var);
    WrapInFunction(var, cast);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr(R"(float16_t v = float16_t(2.0h);
  const vector<float16_t, 3> tint_symbol = vector<float16_t, 3>((v).xxx);)"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_SingleScalar_Bool_Literal) {
    WrapInFunction(Call<vec3<bool>>(true));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("(true).xxx"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_SingleScalar_Bool_Var) {
    auto* var = Var("v", Expr(true));
    auto* cast = Call<vec3<bool>>(var);
    WrapInFunction(var, cast);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr(R"(bool v = true;
  const bool3 tint_symbol = bool3((v).xxx);)"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_SingleScalar_Int) {
    WrapInFunction(Call<vec3<i32>>(2_i));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("2).xxx"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Vec_SingleScalar_UInt) {
    WrapInFunction(Call<vec3<u32>>(2_u));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("2u).xxx"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Mat_F32) {
    WrapInFunction(
        Call<mat2x3<f32>>(Call<vec3<f32>>(1_f, 2_f, 3_f), Call<vec3<f32>>(3_f, 4_f, 5_f)));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();

    EXPECT_THAT(gen.result(),
                HasSubstr("float2x3(float3(1.0f, 2.0f, 3.0f), float3(3.0f, 4.0f, 5.0f))"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Mat_F16) {
    Enable(builtin::Extension::kF16);

    WrapInFunction(
        Call<mat2x3<f16>>(Call<vec3<f16>>(1_h, 2_h, 3_h), Call<vec3<f16>>(3_h, 4_h, 5_h)));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();

    EXPECT_THAT(gen.result(),
                HasSubstr("matrix<float16_t, 2, 3>(vector<float16_t, 3>(float16_t(1.0h), "
                          "float16_t(2.0h), float16_t(3.0h)), vector<float16_t, "
                          "3>(float16_t(3.0h), float16_t(4.0h), float16_t(5.0h)))"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Mat_Complex_F32) {
    // mat4x4<f32>(
    //     vec4<f32>(2.0f, 3.0f, 4.0f, 8.0f),
    //     vec4<f32>(),
    //     vec4<f32>(7.0f),
    //     vec4<f32>(vec4<f32>(42.0f, 21.0f, 6.0f, -5.0f)),
    //   );
    auto* vector_literal = Call<vec4<f32>>(f32(2.0), f32(3.0), f32(4.0), f32(8.0));
    auto* vector_zero_init = Call<vec4<f32>>();
    auto* vector_single_scalar_init = Call<vec4<f32>>(f32(7.0));
    auto* vector_identical_init =
        Call<vec4<f32>>(Call<vec4<f32>>(f32(42.0), f32(21.0), f32(6.0), f32(-5.0)));

    auto* constructor = Call<mat4x4<f32>>(vector_literal, vector_zero_init,
                                          vector_single_scalar_init, vector_identical_init);

    WrapInFunction(constructor);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();

    EXPECT_THAT(gen.result(), HasSubstr("float4x4(float4(2.0f, 3.0f, 4.0f, 8.0f), (0.0f).xxxx, "
                                        "(7.0f).xxxx, float4(42.0f, 21.0f, 6.0f, -5.0f))"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Mat_Complex_F16) {
    // mat4x4<f16>(
    //     vec4<f16>(2.0h, 3.0h, 4.0h, 8.0h),
    //     vec4<f16>(),
    //     vec4<f16>(7.0h),
    //     vec4<f16>(vec4<f16>(42.0h, 21.0h, 6.0h, -5.0h)),
    //   );
    Enable(builtin::Extension::kF16);

    auto* vector_literal = Call<vec4<f16>>(f16(2.0), f16(3.0), f16(4.0), f16(8.0));
    auto* vector_zero_init = Call<vec4<f16>>();
    auto* vector_single_scalar_init = Call<vec4<f16>>(f16(7.0));
    auto* vector_identical_init =
        Call<vec4<f16>>(Call<vec4<f16>>(f16(42.0), f16(21.0), f16(6.0), f16(-5.0)));

    auto* constructor = Call<mat4x4<f16>>(vector_literal, vector_zero_init,
                                          vector_single_scalar_init, vector_identical_init);

    WrapInFunction(constructor);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();

    EXPECT_THAT(gen.result(), HasSubstr("matrix<float16_t, 4, 4>("
                                        "vector<float16_t, 4>(float16_t(2.0h), float16_t(3.0h), "
                                        "float16_t(4.0h), float16_t(8.0h)), "
                                        "(float16_t(0.0h)).xxxx, (float16_t(7.0h)).xxxx, "
                                        "vector<float16_t, 4>(float16_t(42.0h), float16_t(21.0h), "
                                        "float16_t(6.0h), float16_t(-5.0h)))"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Mat_Empty_F32) {
    WrapInFunction(Call<mat2x3<f32>>());

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();

    EXPECT_THAT(gen.result(), HasSubstr("float2x3 tint_symbol = float2x3((0.0f).xxx, (0.0f).xxx)"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Mat_Empty_F16) {
    Enable(builtin::Extension::kF16);

    WrapInFunction(Call<mat2x3<f16>>());

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();

    EXPECT_THAT(gen.result(),
                HasSubstr("matrix<float16_t, 2, 3>((float16_t(0.0h)).xxx, (float16_t(0.0h)).xxx)"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Mat_Identity_F32) {
    // fn f() {
    //     var m_1: mat4x4<f32> = mat4x4<f32>();
    //     var m_2: mat4x4<f32> = mat4x4<f32>(m_1);
    // }

    auto* m_1 = Var("m_1", ty.mat4x4(ty.f32()), Call<mat4x4<f32>>());
    auto* m_2 = Var("m_2", ty.mat4x4(ty.f32()), Call<mat4x4<f32>>(m_1));

    WrapInFunction(m_1, m_2);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();

    EXPECT_THAT(gen.result(), HasSubstr("float4x4 m_2 = float4x4(m_1);"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Mat_Identity_F16) {
    // fn f() {
    //     var m_1: mat4x4<f16> = mat4x4<f16>();
    //     var m_2: mat4x4<f16> = mat4x4<f16>(m_1);
    // }

    Enable(builtin::Extension::kF16);

    auto* m_1 = Var("m_1", ty.mat4x4(ty.f16()), Call<mat4x4<f16>>());
    auto* m_2 = Var("m_2", ty.mat4x4(ty.f16()), Call<mat4x4<f16>>(m_1));

    WrapInFunction(m_1, m_2);

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();

    EXPECT_THAT(gen.result(),
                HasSubstr("matrix<float16_t, 4, 4> m_2 = matrix<float16_t, 4, 4>(m_1);"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Array) {
    WrapInFunction(Call<array<vec3<f32>, 3>>(Call<vec3<f32>>(1_f, 2_f, 3_f),
                                             Call<vec3<f32>>(4_f, 5_f, 6_f),
                                             Call<vec3<f32>>(7_f, 8_f, 9_f)));

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(
        gen.result(),
        HasSubstr(
            "{float3(1.0f, 2.0f, 3.0f), float3(4.0f, 5.0f, 6.0f), float3(7.0f, 8.0f, 9.0f)}"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Array_Empty) {
    WrapInFunction(Call<array<vec3<f32>, 3>>());

    GeneratorImpl& gen = Build();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("(float3[3])0"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Struct) {
    auto* str = Structure("S", utils::Vector{
                                   Member("a", ty.i32()),
                                   Member("b", ty.f32()),
                                   Member("c", ty.vec3<i32>()),
                               });

    WrapInFunction(Call(ty.Of(str), 1_i, 2_f, Call<vec3<i32>>(3_i, 4_i, 5_i)));

    GeneratorImpl& gen = SanitizeAndBuild();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("{1, 2.0f, int3(3, 4, 5)}"));
}

TEST_F(HlslGeneratorImplTest_Constructor, Type_Struct_Empty) {
    auto* str = Structure("S", utils::Vector{
                                   Member("a", ty.i32()),
                                   Member("b", ty.f32()),
                                   Member("c", ty.vec3<i32>()),
                               });

    WrapInFunction(Call(ty.Of(str)));

    GeneratorImpl& gen = SanitizeAndBuild();

    ASSERT_TRUE(gen.Generate()) << gen.Diagnostics();
    EXPECT_THAT(gen.result(), HasSubstr("(S)0"));
}

}  // namespace
}  // namespace tint::writer::hlsl