<?php
/* μlogger
 *
 * Copyright(C) 2017 Bartek Fabiszewski (www.fabiszewski.net)
 *
 * This 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.
 *
 * This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
 */

require_once(dirname(__DIR__) . "/helpers/auth.php");
require_once(ROOT_DIR . "/helpers/track.php");
require_once(ROOT_DIR . "/helpers/position.php");
require_once(ROOT_DIR . "/helpers/utils.php");
require_once(ROOT_DIR . "/helpers/config.php");
require_once(ROOT_DIR . "/helpers/lang.php");

$auth = new uAuth();

$lang = (new uLang(uConfig::$lang))->getStrings();

$uploadErrors = [];
$uploadErrors[UPLOAD_ERR_INI_SIZE] = "The uploaded file exceeds the upload_max_filesize directive in php.ini";
$uploadErrors[UPLOAD_ERR_FORM_SIZE] = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form";
$uploadErrors[UPLOAD_ERR_PARTIAL] = "The uploaded file was only partially uploaded";
$uploadErrors[UPLOAD_ERR_NO_FILE] = "No file was uploaded";
$uploadErrors[UPLOAD_ERR_NO_TMP_DIR] = "Missing a temporary folder";
$uploadErrors[UPLOAD_ERR_CANT_WRITE] = "Failed to write file to disk";
$uploadErrors[UPLOAD_ERR_EXTENSION] = "A PHP extension stopped the file upload";

if (!$auth->isAuthenticated()) {
  uUtils::exitWithError($lang["private"]);
}

try {
  $fileMeta = uUtils::requireFile("gpx");
} catch (ErrorException $ee) {
  $message = $lang["servererror"];
  $message .= ": {$ee->getMessage()}";
  uUtils::exitWithError($message);
} catch (Exception $e) {
  $message = $lang["iuploadfailure"];
  $message .= ": {$e->getMessage()}";
  uUtils::exitWithError($message);
}

$gpxFile = $fileMeta[uUpload::META_TMP_NAME];
$gpxName = basename($fileMeta[uUpload::META_NAME]);
libxml_use_internal_errors(true);
$gpx = simplexml_load_file($gpxFile);
unlink($gpxFile);

if ($gpx === false) {
  $message = $lang["iparsefailure"];
  $parserMessages = [];
  foreach(libxml_get_errors() as $parseError) {
    $parserMessages[] = $parseError->message;
  }
  $parserMessage = implode(", ", $parserMessages);
  if (!empty($parserMessage)) {
    $message .= ": $parserMessage";
  }
  uUtils::exitWithError($message);
}
else if ($gpx->getName() !== "gpx") {
    uUtils::exitWithError($lang["iparsefailure"]);
}
else if (empty($gpx->trk)) {
  uUtils::exitWithError($lang["idatafailure"]);
}

$trackList = [];
foreach ($gpx->trk as $trk) {
  $trackName = empty($trk->name) ? $gpxName : (string) $trk->name;
  $metaName = empty($gpx->metadata->name) ? NULL : (string) $gpx->metadata->name;
  $trackId = uTrack::add($auth->user->id, $trackName, $metaName);
  if ($trackId === false) {
    uUtils::exitWithError($lang["servererror"]);
    break;
  }
  $track = new uTrack($trackId);
  $posCnt = 0;

  foreach($trk->trkseg as $segment) {
    foreach($segment->trkpt as $point) {
      if (!isset($point["lat"], $point["lon"])) {
        $track->delete();
        uUtils::exitWithError($lang["iparsefailure"]);
      }
      $time = isset($point->time) ? strtotime($point->time) : 1;
      $altitude = isset($point->ele) ? (double) $point->ele : NULL;
      $comment = isset($point->desc) && !empty($point->desc) ? (string) $point->desc : NULL;
      $speed = NULL;
      $bearing = NULL;
      $accuracy = NULL;
      $provider = "gps";
      if (!empty($point->extensions)) {
        // parse ulogger extensions
        $ext = $point->extensions->children('ulogger', true);
        if (count($ext->speed)) { $speed = (double) $ext->speed; }
        if (count($ext->bearing)) { $bearing = (double) $ext->bearing; }
        if (count($ext->accuracy)) { $accuracy = (int) $ext->accuracy; }
        if (count($ext->provider)) { $provider = (string) $ext->provider; }
      }
      $ret = $track->addPosition($auth->user->id,
                    $time, (double) $point["lat"], (double) $point["lon"], $altitude,
                    $speed, $bearing, $accuracy, $provider, $comment, NULL);
      if ($ret === false) {
        $track->delete();
        uUtils::exitWithError($lang["servererror"]);
      }
      $posCnt++;
    }
  }
  if ($posCnt) {
    array_unshift($trackList, [ "id" => $track->id, "name" => $track->name ]);
  } else {
    $track->delete();
  }
}

header("Content-type: application/json");
echo json_encode($trackList);
?>