/*!
 * \file gpx_printer.cc
 * \brief Implementation of a class that prints PVT information to a gpx file
 * \author Álvaro Cebrián Juan, 2018. acebrianjuan(at)gmail.com
 *
 *
 * -------------------------------------------------------------------------
 *
 * Copyright (C) 2010-2018  (see AUTHORS file for a list of contributors)
 *
 * GNSS-SDR is a software defined Global Navigation
 *          Satellite Systems receiver
 *
 * This file is part of GNSS-SDR.
 *
 * GNSS-SDR is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GNSS-SDR is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNSS-SDR. If not, see <https://www.gnu.org/licenses/>.
 *
 * -------------------------------------------------------------------------
 */


#include "gpx_printer.h"
#include "rtklib_solver.h"
#include <boost/date_time/posix_time/posix_time.hpp>
#include <glog/logging.h>
#include <ctime>      // for tm
#include <exception>  // for exception
#include <iomanip>    // for operator<<
#include <iostream>   // for cout, cerr
#include <sstream>    // for stringstream

#if HAS_STD_FILESYSTEM
#include <system_error>
namespace errorlib = std;
#if HAS_STD_FILESYSTEM_EXPERIMENTAL
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
#else
#include <filesystem>
namespace fs = std::filesystem;
#endif
#else
#include <boost/filesystem/operations.hpp>   // for create_directories, exists
#include <boost/filesystem/path.hpp>         // for path, operator<<
#include <boost/filesystem/path_traits.hpp>  // for filesystem
#include <boost/system/error_code.hpp>       // for error_code
namespace fs = boost::filesystem;
namespace errorlib = boost::system;
#endif


Gpx_Printer::Gpx_Printer(const std::string& base_path)
{
    positions_printed = false;
    indent = "  ";
    gpx_base_path = base_path;
    fs::path full_path(fs::current_path());
    const fs::path p(gpx_base_path);
    if (!fs::exists(p))
        {
            std::string new_folder;
            for (auto& folder : fs::path(gpx_base_path))
                {
                    new_folder += folder.string();
                    errorlib::error_code ec;
                    if (!fs::exists(new_folder))
                        {
                            if (!fs::create_directory(new_folder, ec))
                                {
                                    std::cout << "Could not create the " << new_folder << " folder." << std::endl;
                                    gpx_base_path = full_path.string();
                                }
                        }
                    new_folder += fs::path::preferred_separator;
                }
        }
    else
        {
            gpx_base_path = p.string();
        }
    if (gpx_base_path != ".")
        {
            std::cout << "GPX files will be stored at " << gpx_base_path << std::endl;
        }

    gpx_base_path = gpx_base_path + fs::path::preferred_separator;
}


bool Gpx_Printer::set_headers(const std::string& filename, bool time_tag_name)
{
    boost::posix_time::ptime pt = boost::posix_time::second_clock::local_time();
    tm timeinfo = boost::posix_time::to_tm(pt);

    if (time_tag_name)
        {
            std::stringstream strm0;
            const int year = timeinfo.tm_year - 100;
            strm0 << year;
            const int month = timeinfo.tm_mon + 1;
            if (month < 10)
                {
                    strm0 << "0";
                }
            strm0 << month;
            const int day = timeinfo.tm_mday;
            if (day < 10)
                {
                    strm0 << "0";
                }
            strm0 << day << "_";
            const int hour = timeinfo.tm_hour;
            if (hour < 10)
                {
                    strm0 << "0";
                }
            strm0 << hour;
            const int min = timeinfo.tm_min;
            if (min < 10)
                {
                    strm0 << "0";
                }
            strm0 << min;
            const int sec = timeinfo.tm_sec;
            if (sec < 10)
                {
                    strm0 << "0";
                }
            strm0 << sec;

            gpx_filename = filename + "_" + strm0.str() + ".gpx";
        }
    else
        {
            gpx_filename = filename + ".gpx";
        }

    gpx_filename = gpx_base_path + gpx_filename;
    gpx_file.open(gpx_filename.c_str());

    if (gpx_file.is_open())
        {
            DLOG(INFO) << "GPX printer writing on " << filename.c_str();
            // Set iostream numeric format and precision
            gpx_file.setf(gpx_file.std::ofstream::fixed, gpx_file.std::ofstream::floatfield);
            gpx_file << std::setprecision(14);
            gpx_file << R"(<?xml version="1.0" encoding="UTF-8"?>)" << std::endl
                     << R"(<gpx version="1.1" creator="GNSS-SDR")" << std::endl
                     << indent << "xsi:schemaLocation=\"http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v2 http://www.garmin.com/xmlschemas/TrackPointExtensionv2.xsd\"" << std::endl
                     << indent << "xmlns=\"http://www.topografix.com/GPX/1/1\"" << std::endl
                     << indent << "xmlns:gpxx=\"http://www.garmin.com/xmlschemas/GpxExtensions/v3\"" << std::endl
                     << indent << "xmlns:gpxtpx=\"http://www.garmin.com/xmlschemas/TrackPointExtension/v2\"" << std::endl
                     << indent << "xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">" << std::endl
                     << indent << "<trk>" << std::endl
                     << indent << indent << "<name>Position fixes computed by GNSS-SDR v" << GNSS_SDR_VERSION << "</name>" << std::endl
                     << indent << indent << "<desc>GNSS-SDR position log generated at " << pt << " (local time)</desc>" << std::endl
                     << indent << indent << "<trkseg>" << std::endl;
            return true;
        }
    std::cout << "File " << gpx_filename << " cannot be saved. Wrong permissions?" << std::endl;
    return false;
}


bool Gpx_Printer::print_position(const std::shared_ptr<Rtklib_Solver>& position, bool print_average_values)
{
    double latitude;
    double longitude;
    double height;

    positions_printed = true;
    const std::shared_ptr<Rtklib_Solver>& position_ = position;

    double speed_over_ground = position_->get_speed_over_ground();    // expressed in m/s
    double course_over_ground = position_->get_course_over_ground();  // expressed in deg

    double hdop = position_->get_hdop();
    double vdop = position_->get_vdop();
    double pdop = position_->get_pdop();
    std::string utc_time = to_iso_extended_string(position_->get_position_UTC_time());
    if (utc_time.length() < 23)
        {
            utc_time += ".";
        }
    utc_time.resize(23, '0');  // time up to ms
    utc_time.append("Z");      // UTC time zone

    if (print_average_values == false)
        {
            latitude = position_->get_latitude();
            longitude = position_->get_longitude();
            height = position_->get_height();
        }
    else
        {
            latitude = position_->get_avg_latitude();
            longitude = position_->get_avg_longitude();
            height = position_->get_avg_height();
        }

    if (gpx_file.is_open())
        {
            gpx_file << indent << indent << indent << "<trkpt lon=\"" << longitude << "\" lat=\"" << latitude << "\"><ele>" << height << "</ele>"
                     << "<time>" << utc_time << "</time>"
                     << "<hdop>" << hdop << "</hdop><vdop>" << vdop << "</vdop><pdop>" << pdop << "</pdop>"
                     << "<extensions><gpxtpx:TrackPointExtension>"
                     << "<gpxtpx:speed>" << speed_over_ground << "</gpxtpx:speed>"
                     << "<gpxtpx:course>" << course_over_ground << "</gpxtpx:course>"
                     << "</gpxtpx:TrackPointExtension></extensions></trkpt>" << std::endl;
            return true;
        }
    return false;
}


bool Gpx_Printer::close_file()
{
    if (gpx_file.is_open())
        {
            gpx_file << indent << indent << "</trkseg>" << std::endl
                     << indent << "</trk>" << std::endl
                     << "</gpx>";
            gpx_file.close();
            return true;
        }
    return false;
}


Gpx_Printer::~Gpx_Printer()
{
    try
        {
            close_file();
        }
    catch (const std::exception& e)
        {
            std::cerr << e.what() << '\n';
        }
    if (!positions_printed)
        {
            errorlib::error_code ec;
            if (!fs::remove(fs::path(gpx_filename), ec))
                {
                    LOG(INFO) << "Error deleting temporary GPX file";
                }
        }
}