// 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 "gmock/gmock.h"
#include "src/tint/ast/call_statement.h"
#include "src/tint/ast/stage_attribute.h"
#include "src/tint/sem/depth_texture_type.h"
#include "src/tint/sem/multisampled_texture_type.h"
#include "src/tint/sem/sampled_texture_type.h"
#include "src/tint/sem/sampler_type.h"
#include "src/tint/sem/storage_texture_type.h"
#include "src/tint/writer/glsl/test_helper.h"

namespace tint::writer::glsl {
namespace {

using ::testing::HasSubstr;

using GlslGeneratorImplTest_Type = TestHelper;

TEST_F(GlslGeneratorImplTest_Type, EmitType_Array) {
  auto* arr = ty.array<bool, 4>();
  Global("G", arr, ast::StorageClass::kPrivate);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, program->TypeOf(arr), ast::StorageClass::kNone,
                           ast::Access::kReadWrite, "ary"))
      << gen.error();
  EXPECT_EQ(out.str(), "bool ary[4]");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_ArrayOfArray) {
  auto* arr = ty.array(ty.array<bool, 4>(), 5);
  Global("G", arr, ast::StorageClass::kPrivate);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, program->TypeOf(arr), ast::StorageClass::kNone,
                           ast::Access::kReadWrite, "ary"))
      << gen.error();
  EXPECT_EQ(out.str(), "bool ary[5][4]");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_ArrayOfArrayOfArray) {
  auto* arr = ty.array(ty.array(ty.array<bool, 4>(), 5), 6);
  Global("G", arr, ast::StorageClass::kPrivate);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, program->TypeOf(arr), ast::StorageClass::kNone,
                           ast::Access::kReadWrite, "ary"))
      << gen.error();
  EXPECT_EQ(out.str(), "bool ary[6][5][4]");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_Array_WithoutName) {
  auto* arr = ty.array<bool, 4>();
  Global("G", arr, ast::StorageClass::kPrivate);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, program->TypeOf(arr), ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "bool[4]");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_Bool) {
  auto* bool_ = create<sem::Bool>();

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, bool_, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "bool");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_F32) {
  auto* f32 = create<sem::F32>();

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, f32, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "float");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_I32) {
  auto* i32 = create<sem::I32>();

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, i32, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "int");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_Matrix) {
  auto* f32 = create<sem::F32>();
  auto* vec3 = create<sem::Vector>(f32, 3u);
  auto* mat2x3 = create<sem::Matrix>(vec3, 2u);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, mat2x3, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "mat2x3");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_StructDecl) {
  auto* s = Structure("S", {
                               Member("a", ty.i32()),
                               Member("b", ty.f32()),
                           });
  Global("g", ty.Of(s), ast::StorageClass::kPrivate);

  GeneratorImpl& gen = Build();

  TextGenerator::TextBuffer buf;
  auto* sem_s = program->TypeOf(s)->As<sem::Struct>();
  ASSERT_TRUE(gen.EmitStructType(&buf, sem_s)) << gen.error();
  EXPECT_EQ(buf.String(), R"(struct S {
  int a;
  float b;
};

)");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_Struct) {
  auto* s = Structure("S", {
                               Member("a", ty.i32()),
                               Member("b", ty.f32()),
                           });
  Global("g", ty.Of(s), ast::StorageClass::kPrivate);

  GeneratorImpl& gen = Build();

  auto* sem_s = program->TypeOf(s)->As<sem::Struct>();
  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, sem_s, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "S");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_Struct_NameCollision) {
  auto* s = Structure("S", {
                               Member("double", ty.i32()),
                               Member("float", ty.f32()),
                           });
  Global("g", ty.Of(s), ast::StorageClass::kPrivate);

  GeneratorImpl& gen = SanitizeAndBuild();

  ASSERT_TRUE(gen.Generate()) << gen.error();
  EXPECT_THAT(gen.result(), HasSubstr(R"(struct S {
  int tint_symbol;
  float tint_symbol_1;
};
)"));
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_Struct_WithOffsetAttributes) {
  auto* s = Structure("S", {
                               Member("a", ty.i32(), {MemberOffset(0)}),
                               Member("b", ty.f32(), {MemberOffset(8)}),
                           });
  Global("g", ty.Of(s), ast::StorageClass::kPrivate);

  GeneratorImpl& gen = Build();

  TextGenerator::TextBuffer buf;
  auto* sem_s = program->TypeOf(s)->As<sem::Struct>();
  ASSERT_TRUE(gen.EmitStructType(&buf, sem_s)) << gen.error();
  EXPECT_EQ(buf.String(), R"(struct S {
  int a;
  float b;
};

)");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_U32) {
  auto* u32 = create<sem::U32>();

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, u32, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "uint");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_Vector) {
  auto* f32 = create<sem::F32>();
  auto* vec3 = create<sem::Vector>(f32, 3u);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, vec3, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "vec3");
}

TEST_F(GlslGeneratorImplTest_Type, EmitType_Void) {
  auto* void_ = create<sem::Void>();

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, void_, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "void");
}

TEST_F(GlslGeneratorImplTest_Type, EmitSampler) {
  auto* sampler = create<sem::Sampler>(ast::SamplerKind::kSampler);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_FALSE(gen.EmitType(out, sampler, ast::StorageClass::kNone,
                            ast::Access::kReadWrite, ""))
      << gen.error();
}

TEST_F(GlslGeneratorImplTest_Type, EmitSamplerComparison) {
  auto* sampler = create<sem::Sampler>(ast::SamplerKind::kComparisonSampler);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_FALSE(gen.EmitType(out, sampler, ast::StorageClass::kNone,
                            ast::Access::kReadWrite, ""))
      << gen.error();
}

struct GlslDepthTextureData {
  ast::TextureDimension dim;
  std::string result;
};
inline std::ostream& operator<<(std::ostream& out, GlslDepthTextureData data) {
  out << data.dim;
  return out;
}
using GlslDepthTexturesTest = TestParamHelper<GlslDepthTextureData>;
TEST_P(GlslDepthTexturesTest, Emit) {
  auto params = GetParam();

  auto* t = ty.depth_texture(params.dim);

  Global("tex", t,
         ast::AttributeList{
             create<ast::BindingAttribute>(1),
             create<ast::GroupAttribute>(2),
         });

  Func("main", {}, ty.void_(), {CallStmt(Call("textureDimensions", "tex"))},
       {Stage(ast::PipelineStage::kFragment)});

  GeneratorImpl& gen = Build();

  ASSERT_TRUE(gen.Generate()) << gen.error();
  EXPECT_THAT(gen.result(), HasSubstr(params.result));
}
INSTANTIATE_TEST_SUITE_P(
    GlslGeneratorImplTest_Type,
    GlslDepthTexturesTest,
    testing::Values(GlslDepthTextureData{ast::TextureDimension::k2d,
                                         "sampler2DShadow tex;"},
                    GlslDepthTextureData{ast::TextureDimension::k2dArray,
                                         "sampler2DArrayShadow tex;"},
                    GlslDepthTextureData{ast::TextureDimension::kCube,
                                         "samplerCubeShadow tex;"},
                    GlslDepthTextureData{ast::TextureDimension::kCubeArray,
                                         "samplerCubeArrayShadow tex;"}));

using GlslDepthMultisampledTexturesTest = TestHelper;
TEST_F(GlslDepthMultisampledTexturesTest, Emit) {
  auto* t = ty.depth_multisampled_texture(ast::TextureDimension::k2d);

  Global("tex", t,
         ast::AttributeList{
             create<ast::BindingAttribute>(1),
             create<ast::GroupAttribute>(2),
         });

  Func("main", {}, ty.void_(), {CallStmt(Call("textureDimensions", "tex"))},
       {Stage(ast::PipelineStage::kFragment)});

  GeneratorImpl& gen = Build();

  ASSERT_TRUE(gen.Generate()) << gen.error();
  EXPECT_THAT(gen.result(), HasSubstr("sampler2DMS tex;"));
}

enum class TextureDataType { F32, U32, I32 };
struct GlslSampledTextureData {
  ast::TextureDimension dim;
  TextureDataType datatype;
  std::string result;
};
inline std::ostream& operator<<(std::ostream& out,
                                GlslSampledTextureData data) {
  out << data.dim;
  return out;
}
using GlslSampledTexturesTest = TestParamHelper<GlslSampledTextureData>;
TEST_P(GlslSampledTexturesTest, Emit) {
  auto params = GetParam();

  const ast::Type* datatype = nullptr;
  switch (params.datatype) {
    case TextureDataType::F32:
      datatype = ty.f32();
      break;
    case TextureDataType::U32:
      datatype = ty.u32();
      break;
    case TextureDataType::I32:
      datatype = ty.i32();
      break;
  }
  auto* t = ty.sampled_texture(params.dim, datatype);

  Global("tex", t,
         ast::AttributeList{
             create<ast::BindingAttribute>(1),
             create<ast::GroupAttribute>(2),
         });

  Func("main", {}, ty.void_(), {CallStmt(Call("textureDimensions", "tex"))},
       {Stage(ast::PipelineStage::kFragment)});

  GeneratorImpl& gen = Build();

  ASSERT_TRUE(gen.Generate()) << gen.error();
  EXPECT_THAT(gen.result(), HasSubstr(params.result));
}
INSTANTIATE_TEST_SUITE_P(GlslGeneratorImplTest_Type,
                         GlslSampledTexturesTest,
                         testing::Values(
                             GlslSampledTextureData{
                                 ast::TextureDimension::k1d,
                                 TextureDataType::F32,
                                 "sampler1D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k2d,
                                 TextureDataType::F32,
                                 "sampler2D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k2dArray,
                                 TextureDataType::F32,
                                 "sampler2DArray tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k3d,
                                 TextureDataType::F32,
                                 "sampler3D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::kCube,
                                 TextureDataType::F32,
                                 "samplerCube tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::kCubeArray,
                                 TextureDataType::F32,
                                 "samplerCubeArray tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k1d,
                                 TextureDataType::U32,
                                 "usampler1D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k2d,
                                 TextureDataType::U32,
                                 "usampler2D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k2dArray,
                                 TextureDataType::U32,
                                 "usampler2DArray tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k3d,
                                 TextureDataType::U32,
                                 "usampler3D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::kCube,
                                 TextureDataType::U32,
                                 "usamplerCube tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::kCubeArray,
                                 TextureDataType::U32,
                                 "usamplerCubeArray tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k1d,
                                 TextureDataType::I32,
                                 "isampler1D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k2d,
                                 TextureDataType::I32,
                                 "isampler2D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k2dArray,
                                 TextureDataType::I32,
                                 "isampler2DArray tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::k3d,
                                 TextureDataType::I32,
                                 "isampler3D tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::kCube,
                                 TextureDataType::I32,
                                 "isamplerCube tex;",
                             },
                             GlslSampledTextureData{
                                 ast::TextureDimension::kCubeArray,
                                 TextureDataType::I32,
                                 "isamplerCubeArray tex;",
                             }));

TEST_F(GlslGeneratorImplTest_Type, EmitMultisampledTexture) {
  auto* f32 = create<sem::F32>();
  auto* s = create<sem::MultisampledTexture>(ast::TextureDimension::k2d, f32);

  GeneratorImpl& gen = Build();

  std::stringstream out;
  ASSERT_TRUE(gen.EmitType(out, s, ast::StorageClass::kNone,
                           ast::Access::kReadWrite, ""))
      << gen.error();
  EXPECT_EQ(out.str(), "highp sampler2DMS");
}

struct GlslStorageTextureData {
  ast::TextureDimension dim;
  ast::TexelFormat imgfmt;
  std::string result;
};
inline std::ostream& operator<<(std::ostream& out,
                                GlslStorageTextureData data) {
  return out << data.dim;
}
using GlslStorageTexturesTest = TestParamHelper<GlslStorageTextureData>;
TEST_P(GlslStorageTexturesTest, Emit) {
  auto params = GetParam();

  auto* t = ty.storage_texture(params.dim, params.imgfmt, ast::Access::kWrite);

  Global("tex", t,
         ast::AttributeList{
             create<ast::BindingAttribute>(1),
             create<ast::GroupAttribute>(2),
         });

  Func("main", {}, ty.void_(), {CallStmt(Call("textureDimensions", "tex"))},
       {Stage(ast::PipelineStage::kFragment)});

  GeneratorImpl& gen = Build();

  ASSERT_TRUE(gen.Generate()) << gen.error();
  EXPECT_THAT(gen.result(), HasSubstr(params.result));
}
INSTANTIATE_TEST_SUITE_P(
    GlslGeneratorImplTest_Type,
    GlslStorageTexturesTest,
    testing::Values(
        GlslStorageTextureData{ast::TextureDimension::k1d,
                               ast::TexelFormat::kRgba8Unorm, "image1D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k2d,
                               ast::TexelFormat::kRgba16Float, "image2D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k2dArray,
                               ast::TexelFormat::kR32Float,
                               "image2DArray tex;"},
        GlslStorageTextureData{ast::TextureDimension::k3d,
                               ast::TexelFormat::kRg32Float, "image3D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k1d,
                               ast::TexelFormat::kRgba32Float, "image1D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k2d,
                               ast::TexelFormat::kRgba16Uint, "image2D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k2dArray,
                               ast::TexelFormat::kR32Uint, "image2DArray tex;"},
        GlslStorageTextureData{ast::TextureDimension::k3d,
                               ast::TexelFormat::kRg32Uint, "image3D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k1d,
                               ast::TexelFormat::kRgba32Uint, "image1D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k2d,
                               ast::TexelFormat::kRgba16Sint, "image2D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k2dArray,
                               ast::TexelFormat::kR32Sint, "image2DArray tex;"},
        GlslStorageTextureData{ast::TextureDimension::k3d,
                               ast::TexelFormat::kRg32Sint, "image3D tex;"},
        GlslStorageTextureData{ast::TextureDimension::k1d,
                               ast::TexelFormat::kRgba32Sint, "image1D tex;"}));

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