// Copyright 2018 The Dawn 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 "common/Constants.h"

#include "dawn_native/ShaderModule.h"

#include "tests/unittests/validation/ValidationTest.h"

#include "utils/WGPUHelpers.h"

#include <sstream>

class ShaderModuleValidationTest : public ValidationTest {};

// Test case with a simpler shader that should successfully be created
TEST_F(ShaderModuleValidationTest, CreationSuccess) {
    const char* shader = R"(
                   OpCapability Shader
              %1 = OpExtInstImport "GLSL.std.450"
                   OpMemoryModel Logical GLSL450
                   OpEntryPoint Fragment %main "main" %fragColor
                   OpExecutionMode %main OriginUpperLeft
                   OpSource GLSL 450
                   OpSourceExtension "GL_GOOGLE_cpp_style_line_directive"
                   OpSourceExtension "GL_GOOGLE_include_directive"
                   OpName %main "main"
                   OpName %fragColor "fragColor"
                   OpDecorate %fragColor Location 0
           %void = OpTypeVoid
              %3 = OpTypeFunction %void
          %float = OpTypeFloat 32
        %v4float = OpTypeVector %float 4
    %_ptr_Output_v4float = OpTypePointer Output %v4float
      %fragColor = OpVariable %_ptr_Output_v4float Output
        %float_1 = OpConstant %float 1
        %float_0 = OpConstant %float 0
             %12 = OpConstantComposite %v4float %float_1 %float_0 %float_0 %float_1
           %main = OpFunction %void None %3
              %5 = OpLabel
                   OpStore %fragColor %12
                   OpReturn
                   OpFunctionEnd)";

    utils::CreateShaderModuleFromASM(device, shader);
}

// Tests that if the output location exceeds kMaxColorAttachments the fragment shader will fail to
// be compiled.
TEST_F(ShaderModuleValidationTest, FragmentOutputLocationExceedsMaxColorAttachments) {
    std::ostringstream stream;
    stream << "[[stage(fragment)]] fn main() -> [[location(" << kMaxColorAttachments
           << R"()]]  vec4<f32> {
            return vec4<f32>(0.0, 1.0, 0.0, 1.0);
        })";
    ASSERT_DEVICE_ERROR(utils::CreateShaderModule(device, stream.str().c_str()));
}

// Test that it is invalid to create a shader module with no chained descriptor. (It must be
// WGSL or SPIRV, not empty)
TEST_F(ShaderModuleValidationTest, NoChainedDescriptor) {
    wgpu::ShaderModuleDescriptor desc = {};
    ASSERT_DEVICE_ERROR(device.CreateShaderModule(&desc));
}

// Test that it is not allowed to use combined texture and sampler.
TEST_F(ShaderModuleValidationTest, CombinedTextureAndSampler) {
    // SPIR-V ASM produced by glslang for the following fragment shader:
    //
    //   #version 450
    //   layout(set = 0, binding = 0) uniform sampler2D tex;
    //   void main () {}
    //
    // Note that the following defines an interface combined texture/sampler which is not allowed
    // in Dawn / WebGPU.
    //
    //   %8 = OpTypeSampledImage %7
    //   %_ptr_UniformConstant_8 = OpTypePointer UniformConstant %8
    //   %tex = OpVariable %_ptr_UniformConstant_8 UniformConstant
    const char* shader = R"(
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %main "main"
               OpExecutionMode %main OriginUpperLeft
               OpSource GLSL 450
               OpName %main "main"
               OpName %tex "tex"
               OpDecorate %tex DescriptorSet 0
               OpDecorate %tex Binding 0
       %void = OpTypeVoid
          %3 = OpTypeFunction %void
      %float = OpTypeFloat 32
          %7 = OpTypeImage %float 2D 0 0 0 1 Unknown
          %8 = OpTypeSampledImage %7
%_ptr_UniformConstant_8 = OpTypePointer UniformConstant %8
        %tex = OpVariable %_ptr_UniformConstant_8 UniformConstant
       %main = OpFunction %void None %3
          %5 = OpLabel
               OpReturn
               OpFunctionEnd
        )";

    ASSERT_DEVICE_ERROR(utils::CreateShaderModuleFromASM(device, shader));
}

// Test that it is not allowed to declare a multisampled-array interface texture.
// TODO(enga): Also test multisampled cube, cube array, and 3D. These have no GLSL keywords.
TEST_F(ShaderModuleValidationTest, MultisampledArrayTexture) {
    // SPIR-V ASM produced by glslang for the following fragment shader:
    //
    //  #version 450
    //  layout(set=0, binding=0) uniform texture2DMSArray tex;
    //  void main () {}}
    //
    // Note that the following defines an interface array multisampled texture which is not allowed
    // in Dawn / WebGPU.
    //
    //  %7 = OpTypeImage %float 2D 0 1 1 1 Unknown
    //  %_ptr_UniformConstant_7 = OpTypePointer UniformConstant %7
    //  %tex = OpVariable %_ptr_UniformConstant_7 UniformConstant
    const char* shader = R"(
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %main "main"
               OpExecutionMode %main OriginUpperLeft
               OpSource GLSL 450
               OpName %main "main"
               OpName %tex "tex"
               OpDecorate %tex DescriptorSet 0
               OpDecorate %tex Binding 0
       %void = OpTypeVoid
          %3 = OpTypeFunction %void
      %float = OpTypeFloat 32
          %7 = OpTypeImage %float 2D 0 1 1 1 Unknown
%_ptr_UniformConstant_7 = OpTypePointer UniformConstant %7
        %tex = OpVariable %_ptr_UniformConstant_7 UniformConstant
       %main = OpFunction %void None %3
          %5 = OpLabel
               OpReturn
               OpFunctionEnd
        )";

    ASSERT_DEVICE_ERROR(utils::CreateShaderModuleFromASM(device, shader));
}

// Tests that shader module compilation messages can be queried.
TEST_F(ShaderModuleValidationTest, GetCompilationMessages) {
    // This test works assuming ShaderModule is backed by a dawn_native::ShaderModuleBase, which
    // is not the case on the wire.
    DAWN_SKIP_TEST_IF(UsesWire());

    wgpu::ShaderModule shaderModule = utils::CreateShaderModule(device, R"(
        [[stage(fragment)]] fn main() -> [[location(0)]] vec4<f32> {
            return vec4<f32>(0.0, 1.0, 0.0, 1.0);
        })");

    dawn_native::ShaderModuleBase* shaderModuleBase =
        reinterpret_cast<dawn_native::ShaderModuleBase*>(shaderModule.Get());
    dawn_native::OwnedCompilationMessages* messages = shaderModuleBase->GetCompilationMessages();
    messages->ClearMessages();
    messages->AddMessageForTesting("Info Message");
    messages->AddMessageForTesting("Warning Message", wgpu::CompilationMessageType::Warning);
    messages->AddMessageForTesting("Error Message", wgpu::CompilationMessageType::Error, 3, 4);

    auto callback = [](WGPUCompilationInfoRequestStatus status, const WGPUCompilationInfo* info,
                       void* userdata) {
        ASSERT_EQ(WGPUCompilationInfoRequestStatus_Success, status);
        ASSERT_NE(nullptr, info);
        ASSERT_EQ(3u, info->messageCount);

        const WGPUCompilationMessage* message = &info->messages[0];
        ASSERT_STREQ("Info Message", message->message);
        ASSERT_EQ(WGPUCompilationMessageType_Info, message->type);
        ASSERT_EQ(0u, message->lineNum);
        ASSERT_EQ(0u, message->linePos);

        message = &info->messages[1];
        ASSERT_STREQ("Warning Message", message->message);
        ASSERT_EQ(WGPUCompilationMessageType_Warning, message->type);
        ASSERT_EQ(0u, message->lineNum);
        ASSERT_EQ(0u, message->linePos);

        message = &info->messages[2];
        ASSERT_STREQ("Error Message", message->message);
        ASSERT_EQ(WGPUCompilationMessageType_Error, message->type);
        ASSERT_EQ(3u, message->lineNum);
        ASSERT_EQ(4u, message->linePos);
    };

    shaderModule.GetCompilationInfo(callback, nullptr);
}