// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2023 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------

#include <json/json.h>

#include <fstream>
#include <sstream>

#include "open3d/io/IJsonConvertibleIO.h"
#include "open3d/utility/Logging.h"

namespace open3d {

namespace {
using namespace io;

bool ReadIJsonConvertibleFromJSONStream(std::istream &json_stream,
                                        utility::IJsonConvertible &object) {
    Json::Value root_object;
    Json::CharReaderBuilder builder;
    builder["collectComments"] = false;
    Json::String errs;
    bool is_parse_successful =
            parseFromStream(builder, json_stream, &root_object, &errs);
    if (!is_parse_successful) {
        utility::LogWarning("Read JSON failed: {}.", errs);
        return false;
    }
    return object.ConvertFromJsonValue(root_object);
}

bool WriteIJsonConvertibleToJSONStream(
        std::ostream &json_stream, const utility::IJsonConvertible &object) {
    Json::Value root_object;
    if (!object.ConvertToJsonValue(root_object)) {
        return false;
    }
    Json::StreamWriterBuilder builder;
    builder["commentStyle"] = "None";
    builder["indentation"] = "\t";
    auto writer = builder.newStreamWriter();
    writer->write(root_object, &json_stream);
    return true;
}

}  // unnamed namespace

namespace io {

bool ReadIJsonConvertibleFromJSON(const std::string &filename,
                                  utility::IJsonConvertible &object) {
    std::ifstream file_in(filename);
    if (!file_in.is_open()) {
        utility::LogWarning("Read JSON failed: unable to open file: {}",
                            filename);
        return false;
    }
    bool success = ReadIJsonConvertibleFromJSONStream(file_in, object);
    file_in.close();
    return success;
}

bool WriteIJsonConvertibleToJSON(const std::string &filename,
                                 const utility::IJsonConvertible &object) {
    std::ofstream file_out(filename);
    if (!file_out.is_open()) {
        utility::LogWarning("Write JSON failed: unable to open file: {}",
                            filename);
        return false;
    }
    bool success = WriteIJsonConvertibleToJSONStream(file_out, object);
    file_out.close();
    return success;
}

bool ReadIJsonConvertibleFromJSONString(const std::string &json_string,
                                        utility::IJsonConvertible &object) {
    std::istringstream iss(json_string);
    return ReadIJsonConvertibleFromJSONStream(iss, object);
}

bool WriteIJsonConvertibleToJSONString(
        std::string &json_string, const utility::IJsonConvertible &object) {
    std::ostringstream oss;
    bool success = WriteIJsonConvertibleToJSONStream(oss, object);
    json_string = oss.str();
    return success;
}

}  // namespace io
}  // namespace open3d