// Copyright 2020 Google Inc.

//

// 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 "json_proto_converter.h"

namespace json_proto {

void JsonProtoConverter::AppendArray(const ArrayValue& array_value) {

  data_ << '[';

  bool need_comma = false;

  for (const auto& value : array_value.value()) {

    // Trailing comma inside of an array makes JSON invalid, avoid adding that.

    if (need_comma)

      data_ << ',';

    else

      need_comma = true;

    AppendValue(value);

  }

  data_ << ']';

}

void JsonProtoConverter::AppendNumber(const NumberValue& number_value) {

  if (number_value.has_float_value()) {

    data_ << number_value.float_value().value();

  } else if (number_value.has_exponent_value()) {

    auto value = number_value.exponent_value();

    data_ << value.base();

    data_ << (value.use_uppercase() ? 'E' : 'e');

    data_ << value.exponent();

  } else if (number_value.has_exponent_frac_value()) {

    auto value = number_value.exponent_value();

    data_ << value.base();

    data_ << (value.use_uppercase() ? 'E' : 'e');

    data_ << value.exponent();

  } else {

    data_ << number_value.integer_value().value();

  }

}

void JsonProtoConverter::AppendObject(const JsonObject& json_object) {

  data_ << '{' << '"' << json_object.name() << '"' << ':';

  AppendValue(json_object.value());

  data_ << '}';

}

void JsonProtoConverter::AppendValue(const JsonValue& json_value) {

  if (json_value.has_object_value()) {

    AppendObject(json_value.object_value());

  } else if (json_value.has_array_value()) {

    AppendArray(json_value.array_value());

  } else if (json_value.has_number_value()) {

    AppendNumber(json_value.number_value());

  } else if (json_value.has_string_value()) {

    data_ << '"' << json_value.string_value().value() << '"';

  } else if (json_value.has_boolean_value()) {

    data_ << (json_value.boolean_value().value() ? "true" : "false");

  } else {

    data_ << "null";

  }

}

std::string JsonProtoConverter::Convert(const JsonObject& json_object) {

  AppendObject(json_object);

  return data_.str();

}

std::string JsonProtoConverter::Convert(

    const json_proto::ArrayValue& json_array) {

  AppendArray(json_array);

  return data_.str();

}

}  // namespace json_proto