// Copyright (c) 2017 Pierre Moreau
//
// 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.

#ifndef LIBSPIRV_TEST_LINK_LINK_TEST
#define LIBSPIRV_TEST_LINK_LINK_TEST

#include <iostream>

#include "source/spirv_constant.h"
#include "unit_spirv.h"

#include "spirv-tools/linker.hpp"

namespace spvtest {

using Binary = std::vector<uint32_t>;
using Binaries = std::vector<Binary>;

class LinkerTest : public ::testing::Test {
 public:
  LinkerTest()
      : tools_(SPV_ENV_UNIVERSAL_1_2),
        linker_(SPV_ENV_UNIVERSAL_1_2),
        assemble_options_(spvtools::SpirvTools::kDefaultAssembleOption),
        disassemble_options_(spvtools::SpirvTools::kDefaultDisassembleOption) {
    const auto consumer = [this](spv_message_level_t level, const char*,
                                 const spv_position_t& position,
                                 const char* message) {
      if (!error_message_.empty()) error_message_ += "\n";
      switch (level) {
        case SPV_MSG_FATAL:
        case SPV_MSG_INTERNAL_ERROR:
        case SPV_MSG_ERROR:
          error_message_ += "ERROR";
          break;
        case SPV_MSG_WARNING:
          error_message_ += "WARNING";
          break;
        case SPV_MSG_INFO:
          error_message_ += "INFO";
          break;
        case SPV_MSG_DEBUG:
          error_message_ += "DEBUG";
          break;
      }
      error_message_ += ": " + std::to_string(position.index) + ": " + message;
    };
    tools_.SetMessageConsumer(consumer);
    linker_.SetMessageConsumer(consumer);
  }

  virtual void TearDown() override { error_message_.clear(); }

  // Assembles each of the given strings into SPIR-V binaries before linking
  // them together. SPV_ERROR_INVALID_TEXT is returned if the assembling failed
  // for any of the input strings, and SPV_ERROR_INVALID_POINTER if
  // |linked_binary| is a null pointer.
  spv_result_t AssembleAndLink(
      const std::vector<std::string>& bodies, spvtest::Binary* linked_binary,
      spvtools::LinkerOptions options = spvtools::LinkerOptions()) {
    if (!linked_binary) return SPV_ERROR_INVALID_POINTER;

    spvtest::Binaries binaries(bodies.size());
    for (size_t i = 0u; i < bodies.size(); ++i)
      if (!tools_.Assemble(bodies[i], binaries.data() + i, assemble_options_))
        return SPV_ERROR_INVALID_TEXT;

    return linker_.Link(binaries, *linked_binary, options);
  }

  // Links the given SPIR-V binaries together; SPV_ERROR_INVALID_POINTER is
  // returned if |linked_binary| is a null pointer.
  spv_result_t Link(
      const spvtest::Binaries& binaries, spvtest::Binary* linked_binary,
      spvtools::LinkerOptions options = spvtools::LinkerOptions()) {
    if (!linked_binary) return SPV_ERROR_INVALID_POINTER;
    return linker_.Link(binaries, *linked_binary, options);
  }

  // Disassembles |binary| and outputs the result in |text|. If |text| is a
  // null pointer, SPV_ERROR_INVALID_POINTER is returned.
  spv_result_t Disassemble(const spvtest::Binary& binary, std::string* text) {
    if (!text) return SPV_ERROR_INVALID_POINTER;
    return tools_.Disassemble(binary, text, disassemble_options_)
               ? SPV_SUCCESS
               : SPV_ERROR_INVALID_BINARY;
  }

  // Sets the options for the assembler.
  void SetAssembleOptions(uint32_t assemble_options) {
    assemble_options_ = assemble_options;
  }

  // Sets the options used by the disassembler.
  void SetDisassembleOptions(uint32_t disassemble_options) {
    disassemble_options_ = disassemble_options;
  }

  // Returns the accumulated error messages for the test.
  std::string GetErrorMessage() const { return error_message_; }

 private:
  spvtools::SpirvTools
      tools_;  // An instance for calling SPIRV-Tools functionalities.
  spvtools::Linker linker_;
  uint32_t assemble_options_;
  uint32_t disassemble_options_;
  std::string error_message_;
};

}  // namespace spvtest

#endif  // LIBSPIRV_TEST_LINK_LINK_TEST
