// Copyright 2010-2021 Google LLC
// 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 "ortools/util/proto_tools.h"

#include <string>

#include "absl/strings/str_cat.h"
#include "google/protobuf/descriptor.h"
#include "google/protobuf/message.h"
#include "google/protobuf/text_format.h"

namespace operations_research {
namespace {
using ::google::protobuf::Descriptor;
using ::google::protobuf::FieldDescriptor;
using ::google::protobuf::Reflection;
using ::google::protobuf::TextFormat;

void WriteFullProtocolMessage(const google::protobuf::Message& message,
                              int indent_level, std::string* out) {
  std::string temp_string;
  const std::string indent(indent_level * 2, ' ');
  const Descriptor* desc = message.GetDescriptor();
  const Reflection* refl = message.GetReflection();
  for (int i = 0; i < desc->field_count(); ++i) {
    const FieldDescriptor* fd = desc->field(i);
    const bool repeated = fd->is_repeated();
    const int start = repeated ? 0 : -1;
    const int limit = repeated ? refl->FieldSize(message, fd) : 0;
    for (int j = start; j < limit; ++j) {
      absl::StrAppend(out, indent, fd->name());
      if (fd->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
        absl::StrAppend(out, " {\n");
        const google::protobuf::Message& nested_message =
            repeated ? refl->GetRepeatedMessage(message, fd, j)
                     : refl->GetMessage(message, fd);
        WriteFullProtocolMessage(nested_message, indent_level + 1, out);
        absl::StrAppend(out, indent, "}\n");
      } else {
        TextFormat::PrintFieldValueToString(message, fd, j, &temp_string);
        absl::StrAppend(out, ": ", temp_string, "\n");
      }
    }
  }
}
}  // namespace

std::string FullProtocolMessageAsString(
    const google::protobuf::Message& message, int indent_level) {
  std::string message_str;
  WriteFullProtocolMessage(message, indent_level, &message_str);
  return message_str;
}

}  // namespace operations_research
