// 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/builtin_texture_helper_test.h"
#include "src/tint/ast/call_statement.h"
#include "src/tint/ast/stage_attribute.h"
#include "src/tint/writer/glsl/test_helper.h"

namespace tint {
namespace writer {
namespace glsl {
namespace {

using ::testing::HasSubstr;

struct ExpectedResult {
  ExpectedResult(const char* o) : out(o) {}  // NOLINT

  std::string pre;
  std::string out;
};

ExpectedResult expected_texture_overload(
    ast::builtin::test::ValidTextureOverload overload) {
  using ValidTextureOverload = ast::builtin::test::ValidTextureOverload;
  switch (overload) {
    case ValidTextureOverload::kDimensions1d:
    case ValidTextureOverload::kDimensions2d:
    case ValidTextureOverload::kDimensionsDepth2d:
    case ValidTextureOverload::kDimensionsDepthMultisampled2d:
    case ValidTextureOverload::kDimensionsMultisampled2d:
    case ValidTextureOverload::kDimensions2dArray:
    case ValidTextureOverload::kDimensionsDepth2dArray:
    case ValidTextureOverload::kDimensions3d:
    case ValidTextureOverload::kDimensionsCube:
    case ValidTextureOverload::kDimensionsDepthCube:
    case ValidTextureOverload::kDimensionsCubeArray:
    case ValidTextureOverload::kDimensionsDepthCubeArray:
    case ValidTextureOverload::kDimensions2dLevel:
    case ValidTextureOverload::kDimensionsDepth2dLevel:
    case ValidTextureOverload::kDimensions2dArrayLevel:
    case ValidTextureOverload::kDimensionsDepth2dArrayLevel:
    case ValidTextureOverload::kDimensions3dLevel:
    case ValidTextureOverload::kDimensionsCubeLevel:
    case ValidTextureOverload::kDimensionsDepthCubeLevel:
    case ValidTextureOverload::kDimensionsCubeArrayLevel:
    case ValidTextureOverload::kDimensionsDepthCubeArrayLevel:
      return {"textureSize"};
    case ValidTextureOverload::kDimensionsStorageWO1d:
    case ValidTextureOverload::kDimensionsStorageWO2d:
    case ValidTextureOverload::kDimensionsStorageWO2dArray:
    case ValidTextureOverload::kDimensionsStorageWO3d:
      return {"imageSize"};
    case ValidTextureOverload::kGather2dF32:
      return R"(textureGather(tint_symbol_sampler, vec2(1.0f, 2.0f), 0))";
    case ValidTextureOverload::kGather2dOffsetF32:
      return R"(textureGatherOffset(tint_symbol_sampler, vec2(1.0f, 2.0f), ivec2(3, 4), 0))";
    case ValidTextureOverload::kGather2dArrayF32:
      return R"(textureGather(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), 0))";
    case ValidTextureOverload::kGather2dArrayOffsetF32:
      return R"(textureGatherOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), ivec2(4, 5), 0))";
    case ValidTextureOverload::kGatherCubeF32:
      return R"(textureGather(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 0))";
    case ValidTextureOverload::kGatherCubeArrayF32:
      return R"(textureGather(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), 0))";
    case ValidTextureOverload::kGatherDepth2dF32:
      return R"(textureGather(tint_symbol_sampler, vec2(1.0f, 2.0f), 0.0))";
    case ValidTextureOverload::kGatherDepth2dOffsetF32:
      return R"(textureGatherOffset(tint_symbol_sampler, vec2(1.0f, 2.0f), 0.0, ivec2(3, 4))";
    case ValidTextureOverload::kGatherDepth2dArrayF32:
      return R"(textureGather(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), 0.0))";
    case ValidTextureOverload::kGatherDepth2dArrayOffsetF32:
      return R"(textureGatherOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), 0.0, ivec2(4, 5)))";
    case ValidTextureOverload::kGatherDepthCubeF32:
      return R"(textureGather(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 0.0))";
    case ValidTextureOverload::kGatherDepthCubeArrayF32:
      return R"(textureGather(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), 0.0))";
    case ValidTextureOverload::kGatherCompareDepth2dF32:
      return R"(textureGather(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f))";
    case ValidTextureOverload::kGatherCompareDepth2dOffsetF32:
      return R"(textureGatherOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), ivec2(4, 5)))";
    case ValidTextureOverload::kGatherCompareDepth2dArrayF32:
      return R"(textureGather(tint_symbol_sampler, vec4(1.0f, 2.0f, float(3), 4.0f)))";
    case ValidTextureOverload::kGatherCompareDepth2dArrayOffsetF32:
      return R"(textureGatherOffset(tint_symbol_sampler, vec4(1.0f, 2.0f, float(3), 4.0f), ivec2(5, 6)))";
    case ValidTextureOverload::kGatherCompareDepthCubeF32:
      return R"(textureGather(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, 4.0f)))";
    case ValidTextureOverload::kGatherCompareDepthCubeArrayF32:
      return R"(textureGather(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), 5.0f))";
    case ValidTextureOverload::kNumLayers2dArray:
    case ValidTextureOverload::kNumLayersDepth2dArray:
    case ValidTextureOverload::kNumLayersCubeArray:
    case ValidTextureOverload::kNumLayersDepthCubeArray:
      return {"textureSize"};
    case ValidTextureOverload::kNumLayersStorageWO2dArray:
      return {"imageSize"};
    case ValidTextureOverload::kNumLevels2d:
    case ValidTextureOverload::kNumLevelsCube:
    case ValidTextureOverload::kNumLevelsDepth2d:
    case ValidTextureOverload::kNumLevelsDepthCube:
    case ValidTextureOverload::kNumLevels2dArray:
    case ValidTextureOverload::kNumLevels3d:
    case ValidTextureOverload::kNumLevelsCubeArray:
    case ValidTextureOverload::kNumLevelsDepth2dArray:
    case ValidTextureOverload::kNumLevelsDepthCubeArray:
      return {"textureQueryLevels"};
    case ValidTextureOverload::kNumSamplesDepthMultisampled2d:
    case ValidTextureOverload::kNumSamplesMultisampled2d:
      return {"textureSamples"};
    case ValidTextureOverload::kSample1dF32:
      return R"(texture(tint_symbol_sampler, 1.0f);)";
    case ValidTextureOverload::kSample2dF32:
      return R"(texture(tint_symbol_sampler, vec2(1.0f, 2.0f));)";
    case ValidTextureOverload::kSample2dOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec2(1.0f, 2.0f), ivec2(3, 4));)";
    case ValidTextureOverload::kSample2dArrayF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)));)";
    case ValidTextureOverload::kSample2dArrayOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), ivec2(4, 5));)";
    case ValidTextureOverload::kSample3dF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f));)";
    case ValidTextureOverload::kSample3dOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), ivec3(4, 5, 6));)";
    case ValidTextureOverload::kSampleCubeF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f));)";
    case ValidTextureOverload::kSampleCubeArrayF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)));)";
    case ValidTextureOverload::kSampleDepth2dF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, 0.0f));)";
    case ValidTextureOverload::kSampleDepth2dOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, 0.0f), ivec2(3, 4));)";
    case ValidTextureOverload::kSampleDepth2dArrayF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, float(3), 0.0f));)";
    case ValidTextureOverload::kSampleDepth2dArrayOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec4(1.0f, 2.0f, float(3), 0.0f), ivec2(4, 5));)";
    case ValidTextureOverload::kSampleDepthCubeF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, 0.0f));)";
    case ValidTextureOverload::kSampleDepthCubeArrayF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), 0.0f);)";
    case ValidTextureOverload::kSampleBias2dF32:
      return R"(texture(tint_symbol_sampler, vec2(1.0f, 2.0f), 3.0f);)";
    case ValidTextureOverload::kSampleBias2dOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec2(1.0f, 2.0f), ivec2(4, 5), 3.0f);)";
    case ValidTextureOverload::kSampleBias2dArrayF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, float(4)), 3.0f);)";
    case ValidTextureOverload::kSampleBias2dArrayOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), ivec2(5, 6), 4.0f);)";
    case ValidTextureOverload::kSampleBias3dF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 4.0f);)";
    case ValidTextureOverload::kSampleBias3dOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), ivec3(5, 6, 7), 4.0f);)";
    case ValidTextureOverload::kSampleBiasCubeF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 4.0f);)";
    case ValidTextureOverload::kSampleBiasCubeArrayF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(3)), 4.0f);)";
    case ValidTextureOverload::kSampleLevel2dF32:
      return R"(textureLod(tint_symbol_sampler, vec2(1.0f, 2.0f), 3.0f);)";
    case ValidTextureOverload::kSampleLevel2dOffsetF32:
      return R"(textureLodOffset(tint_symbol_sampler, vec2(1.0f, 2.0f), 3.0f, ivec2(4, 5));)";
    case ValidTextureOverload::kSampleLevel2dArrayF32:
      return R"(textureLod(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), 4.0f);)";
    case ValidTextureOverload::kSampleLevel2dArrayOffsetF32:
      return R"(textureLodOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), 4.0f, ivec2(5, 6));)";
    case ValidTextureOverload::kSampleLevel3dF32:
      return R"(textureLod(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 4.0f);)";
    case ValidTextureOverload::kSampleLevel3dOffsetF32:
      return R"(textureLodOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 4.0f, ivec3(5, 6, 7));)";
    case ValidTextureOverload::kSampleLevelCubeF32:
      return R"(textureLod(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 4.0f);)";
    case ValidTextureOverload::kSampleLevelCubeArrayF32:
      return R"(textureLod(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), 5.0f);)";
    case ValidTextureOverload::kSampleLevelDepth2dF32:
      return R"(textureLod(tint_symbol_sampler, vec2(1.0f, 2.0f), 3).x;)";
    case ValidTextureOverload::kSampleLevelDepth2dOffsetF32:
      return R"(textureLodOffset(tint_symbol_sampler, vec2(1.0f, 2.0f), 3, ivec2(4, 5)).x;)";
    case ValidTextureOverload::kSampleLevelDepth2dArrayF32:
      return R"(textureLod(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), 4).x;)";
    case ValidTextureOverload::kSampleLevelDepth2dArrayOffsetF32:
      return R"(textureLodOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), 4, ivec2(5, 6)).x;)";
    case ValidTextureOverload::kSampleLevelDepthCubeF32:
      return R"(textureLod(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 4).x;)";
    case ValidTextureOverload::kSampleLevelDepthCubeArrayF32:
      return R"(textureLod(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), 5).x;)";
    case ValidTextureOverload::kSampleGrad2dF32:
      return R"(textureGrad(tint_symbol_sampler, vec2(1.0f, 2.0f), vec2(3.0f, 4.0f), vec2(5.0f, 6.0f));)";
    case ValidTextureOverload::kSampleGrad2dOffsetF32:
      return R"(textureGradOffset(tint_symbol_sampler, vec2(1.0f, 2.0f), vec2(3.0f, 4.0f), vec2(5.0f, 6.0f), ivec2(7, 7));)";
    case ValidTextureOverload::kSampleGrad2dArrayF32:
      return R"(textureGrad(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), vec2(4.0f, 5.0f), vec2(6.0f, 7.0f));)";
    case ValidTextureOverload::kSampleGrad2dArrayOffsetF32:
      return R"(textureGradOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, float(3)), vec2(4.0f, 5.0f), vec2(6.0f, 7.0f), ivec2(6, 7));)";
    case ValidTextureOverload::kSampleGrad3dF32:
      return R"(textureGrad(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), vec3(4.0f, 5.0f, 6.0f), vec3(7.0f, 8.0f, 9.0f));)";
    case ValidTextureOverload::kSampleGrad3dOffsetF32:
      return R"(textureGradOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), vec3(4.0f, 5.0f, 6.0f), vec3(7.0f, 8.0f, 9.0f), ivec3(0, 1, 2));)";
    case ValidTextureOverload::kSampleGradCubeF32:
      return R"(textureGrad(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), vec3(4.0f, 5.0f, 6.0f), vec3(7.0f, 8.0f, 9.0f));)";
    case ValidTextureOverload::kSampleGradCubeArrayF32:
      return R"(textureGrad(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), vec3(5.0f, 6.0f, 7.0f), vec3(8.0f, 9.0f, 10.0f));)";
    case ValidTextureOverload::kSampleCompareDepth2dF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f));)";
    case ValidTextureOverload::kSampleCompareDepth2dOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), ivec2(4, 5));)";
    case ValidTextureOverload::kSampleCompareDepth2dArrayF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, float(4), 3.0f));)";
    case ValidTextureOverload::kSampleCompareDepth2dArrayOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec4(1.0f, 2.0f, float(4), 3.0f), ivec2(5, 6));)";
    case ValidTextureOverload::kSampleCompareDepthCubeF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, 4.0f));)";
    case ValidTextureOverload::kSampleCompareDepthCubeArrayF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), 5.0f);)";
    case ValidTextureOverload::kSampleCompareLevelDepth2dF32:
      return R"(yyytexture(tint_symbol_sampler, vec2(1.0f, 2.0f), 3.0f);)";
    case ValidTextureOverload::kSampleCompareLevelDepth2dOffsetF32:
      return R"(yyytextureOffset(tint_symbol_sampler, vec2(1.0f, 2.0f), 3.0f, ivec2(4, 5));)";
    case ValidTextureOverload::kSampleCompareLevelDepth2dArrayF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, float(4)), 3.0f);)";
    case ValidTextureOverload::kSampleCompareLevelDepth2dArrayOffsetF32:
      return R"(textureOffset(tint_symbol_sampler, vec3(1.0f, 2.0f, float(4)), 3.0f, ivec2(5, 6));)";
    case ValidTextureOverload::kSampleCompareLevelDepthCubeF32:
      return R"(texture(tint_symbol_sampler, vec3(1.0f, 2.0f, 3.0f), 4.0f);)";
    case ValidTextureOverload::kSampleCompareLevelDepthCubeArrayF32:
      return R"(texture(tint_symbol_sampler, vec4(1.0f, 2.0f, 3.0f, float(4)), 5.0f);)";
    case ValidTextureOverload::kLoad1dLevelF32:
    case ValidTextureOverload::kLoad1dLevelU32:
    case ValidTextureOverload::kLoad1dLevelI32:
      return R"(texelFetch(tint_symbol_2, 1, 3);)";
    case ValidTextureOverload::kLoad2dLevelF32:
    case ValidTextureOverload::kLoad2dLevelU32:
    case ValidTextureOverload::kLoad2dLevelI32:
      return R"(texelFetch(tint_symbol_2, ivec2(1, 2), 3);)";
    case ValidTextureOverload::kLoad2dArrayLevelF32:
    case ValidTextureOverload::kLoad2dArrayLevelU32:
    case ValidTextureOverload::kLoad2dArrayLevelI32:
    case ValidTextureOverload::kLoad3dLevelF32:
    case ValidTextureOverload::kLoad3dLevelU32:
    case ValidTextureOverload::kLoad3dLevelI32:
      return R"(texelFetch(tint_symbol_2, ivec3(1, 2, 3), 4);)";
    case ValidTextureOverload::kLoadDepthMultisampled2dF32:
    case ValidTextureOverload::kLoadMultisampled2dF32:
    case ValidTextureOverload::kLoadMultisampled2dU32:
    case ValidTextureOverload::kLoadMultisampled2dI32:
      return R"(texelFetch(tint_symbol_2, ivec2(1, 2), 3);)";
    case ValidTextureOverload::kLoadDepth2dLevelF32:
      return R"(texelFetch(tint_symbol_2, ivec2(1, 2), 3);)";
    case ValidTextureOverload::kLoadDepth2dArrayLevelF32:
      return R"(texelFetch(tint_symbol_2, ivec3(1, 2, 3), 4);)";
    case ValidTextureOverload::kStoreWO1dRgba32float:
      return R"(imageStore(tint_symbol, 1, vec4(2.0f, 3.0f, 4.0f, 5.0f));)";
    case ValidTextureOverload::kStoreWO2dRgba32float:
      return R"(imageStore(tint_symbol, ivec2(1, 2), vec4(3.0f, 4.0f, 5.0f, 6.0f));)";
    case ValidTextureOverload::kStoreWO2dArrayRgba32float:
      return R"(imageStore(tint_symbol, ivec3(1, 2, 3), vec4(4.0f, 5.0f, 6.0f, 7.0f));)";
    case ValidTextureOverload::kStoreWO3dRgba32float:
      return R"(imageStore(tint_symbol, ivec3(1, 2, 3), vec4(4.0f, 5.0f, 6.0f, 7.0f));)";
  }
  return "<unmatched texture overload>";
}  // NOLINT - Ignore the length of this function

class GlslGeneratorBuiltinTextureTest
    : public TestParamHelper<ast::builtin::test::TextureOverloadCase> {};

TEST_P(GlslGeneratorBuiltinTextureTest, Call) {
  auto param = GetParam();

  param.BuildTextureVariable(this);
  param.BuildSamplerVariable(this);

  auto* call = Call(param.function, param.args(this));
  auto* stmt = CallStmt(call);

  Func("main", {}, ty.void_(), {stmt}, {Stage(ast::PipelineStage::kFragment)});

  GeneratorImpl& gen = SanitizeAndBuild();

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

  auto expected = expected_texture_overload(param.overload);

  EXPECT_THAT(gen.result(), HasSubstr(expected.pre));
  EXPECT_THAT(gen.result(), HasSubstr(expected.out));
}

INSTANTIATE_TEST_SUITE_P(
    GlslGeneratorBuiltinTextureTest,
    GlslGeneratorBuiltinTextureTest,
    testing::ValuesIn(ast::builtin::test::TextureOverloadCase::ValidCases()));

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