// Copyright 2021 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 "src/tint/utils/string_stream.h"
#include "src/tint/writer/glsl/test_helper.h"

#include "gmock/gmock.h"

using namespace tint::number_suffixes;  // NOLINT

namespace tint::writer::glsl {
namespace {

using GlslGeneratorImplTest_Import = TestHelper;

struct GlslImportData {
    const char* name;
    const char* glsl_name;
};
inline std::ostream& operator<<(std::ostream& out, GlslImportData data) {
    out << data.name;
    return out;
}

using GlslImportData_SingleParamTest = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_SingleParamTest, FloatScalar) {
    auto param = GetParam();

    auto* expr = Call(param.name, 1_f);
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(), std::string(param.glsl_name) + "(1.0f)");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_SingleParamTest,
                         testing::Values(GlslImportData{"abs", "abs"},
                                         GlslImportData{"acos", "acos"},
                                         GlslImportData{"asin", "asin"},
                                         GlslImportData{"atan", "atan"},
                                         GlslImportData{"cos", "cos"},
                                         GlslImportData{"cosh", "cosh"},
                                         GlslImportData{"ceil", "ceil"},
                                         GlslImportData{"exp", "exp"},
                                         GlslImportData{"exp2", "exp2"},
                                         GlslImportData{"floor", "floor"},
                                         GlslImportData{"fract", "fract"},
                                         GlslImportData{"inverseSqrt", "inversesqrt"},
                                         GlslImportData{"length", "length"},
                                         GlslImportData{"log", "log"},
                                         GlslImportData{"log2", "log2"},
                                         GlslImportData{"round", "round"},
                                         GlslImportData{"sign", "sign"},
                                         GlslImportData{"sin", "sin"},
                                         GlslImportData{"sinh", "sinh"},
                                         GlslImportData{"sqrt", "sqrt"},
                                         GlslImportData{"tan", "tan"},
                                         GlslImportData{"tanh", "tanh"},
                                         GlslImportData{"trunc", "trunc"}));

using GlslImportData_SingleIntParamTest = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_SingleIntParamTest, IntScalar) {
    auto param = GetParam();

    auto* expr = Call(param.name, Expr(1_i));
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(), std::string(param.glsl_name) + "(1)");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_SingleIntParamTest,
                         testing::Values(GlslImportData{"abs", "abs"}));

using GlslImportData_SingleVectorParamTest = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_SingleVectorParamTest, FloatVector) {
    auto param = GetParam();

    auto* expr = Call(param.name, vec3<f32>(0.1_f, 0.2_f, 0.3_f));
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(
        out.str(),
        std::string(param.glsl_name) +
            "(vec3(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f))");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_SingleVectorParamTest,
                         testing::Values(GlslImportData{"abs", "abs"},
                                         GlslImportData{"acos", "acos"},
                                         GlslImportData{"asin", "asin"},
                                         GlslImportData{"atan", "atan"},
                                         GlslImportData{"cos", "cos"},
                                         GlslImportData{"cosh", "cosh"},
                                         GlslImportData{"ceil", "ceil"},
                                         GlslImportData{"exp", "exp"},
                                         GlslImportData{"exp2", "exp2"},
                                         GlslImportData{"floor", "floor"},
                                         GlslImportData{"fract", "fract"},
                                         GlslImportData{"inverseSqrt", "inversesqrt"},
                                         GlslImportData{"length", "length"},
                                         GlslImportData{"log", "log"},
                                         GlslImportData{"log2", "log2"},
                                         GlslImportData{"normalize", "normalize"},
                                         GlslImportData{"round", "round"},
                                         GlslImportData{"sign", "sign"},
                                         GlslImportData{"sin", "sin"},
                                         GlslImportData{"sinh", "sinh"},
                                         GlslImportData{"sqrt", "sqrt"},
                                         GlslImportData{"tan", "tan"},
                                         GlslImportData{"tanh", "tanh"},
                                         GlslImportData{"trunc", "trunc"}));

using GlslImportData_DualParam_ScalarTest = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_DualParam_ScalarTest, Float) {
    auto param = GetParam();

    auto* expr = Call(param.name, 1_f, 2_f);
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(), std::string(param.glsl_name) + "(1.0f, 2.0f)");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_DualParam_ScalarTest,
                         testing::Values(GlslImportData{"atan2", "atan"},
                                         GlslImportData{"distance", "distance"},
                                         GlslImportData{"max", "max"},
                                         GlslImportData{"min", "min"},
                                         GlslImportData{"pow", "pow"},
                                         GlslImportData{"step", "step"}));

using GlslImportData_DualParam_VectorTest = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_DualParam_VectorTest, Float) {
    auto param = GetParam();

    auto* expr = Call(param.name, vec3<f32>(1_f, 2_f, 3_f), vec3<f32>(4_f, 5_f, 6_f));
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(),
              std::string(param.glsl_name) + "(vec3(1.0f, 2.0f, 3.0f), vec3(4.0f, 5.0f, 6.0f))");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_DualParam_VectorTest,
                         testing::Values(GlslImportData{"atan2", "atan"},
                                         GlslImportData{"cross", "cross"},
                                         GlslImportData{"distance", "distance"},
                                         GlslImportData{"max", "max"},
                                         GlslImportData{"min", "min"},
                                         GlslImportData{"pow", "pow"},
                                         GlslImportData{"reflect", "reflect"},
                                         GlslImportData{"step", "step"}));

using GlslImportData_DualParam_Int_Test = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_DualParam_Int_Test, IntScalar) {
    auto param = GetParam();

    auto* expr = Call(param.name, 1_i, 2_i);
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(), std::string(param.glsl_name) + "(1, 2)");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_DualParam_Int_Test,
                         testing::Values(GlslImportData{"max", "max"},
                                         GlslImportData{"min", "min"}));

using GlslImportData_TripleParam_ScalarTest = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_TripleParam_ScalarTest, Float) {
    auto param = GetParam();

    auto* expr = Call(param.name, 1_f, 2_f, 3_f);
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(), std::string(param.glsl_name) + "(1.0f, 2.0f, 3.0f)");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_TripleParam_ScalarTest,
                         testing::Values(GlslImportData{"mix", "mix"},
                                         GlslImportData{"clamp", "clamp"},
                                         GlslImportData{"smoothstep", "smoothstep"}));

using GlslImportData_TripleParam_VectorTest = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_TripleParam_VectorTest, Float) {
    auto param = GetParam();

    auto* expr = Call(param.name, vec3<f32>(1_f, 2_f, 3_f), vec3<f32>(4_f, 5_f, 6_f),
                      vec3<f32>(7_f, 8_f, 9_f));
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(),
              std::string(param.glsl_name) +
                  R"((vec3(1.0f, 2.0f, 3.0f), vec3(4.0f, 5.0f, 6.0f), vec3(7.0f, 8.0f, 9.0f)))");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_TripleParam_VectorTest,
                         testing::Values(GlslImportData{"faceForward", "faceforward"},
                                         GlslImportData{"clamp", "clamp"},
                                         GlslImportData{"smoothstep", "smoothstep"}));

using GlslImportData_TripleParam_Int_Test = TestParamHelper<GlslImportData>;
TEST_P(GlslImportData_TripleParam_Int_Test, IntScalar) {
    auto param = GetParam();

    auto* expr = Call(param.name, 1_i, 2_i, 3_i);
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(), std::string(param.glsl_name) + "(1, 2, 3)");
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Import,
                         GlslImportData_TripleParam_Int_Test,
                         testing::Values(GlslImportData{"clamp", "clamp"}));

TEST_F(GlslGeneratorImplTest_Import, GlslImportData_Determinant) {
    GlobalVar("var", ty.mat3x3<f32>(), builtin::AddressSpace::kPrivate);

    auto* expr = Call("determinant", "var");
    WrapInFunction(expr);

    GeneratorImpl& gen = Build();

    utils::StringStream out;
    gen.EmitCall(out, expr);
    EXPECT_THAT(gen.Diagnostics(), testing::IsEmpty());
    EXPECT_EQ(out.str(), std::string("determinant(var)"));
}

}  // namespace
}  // namespace tint::writer::glsl