/* 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/>.
 */

// google maps
var map;
var polies = [];
var markers = [];
var popups = [];
var popup;
var polyOptions;
var mapOptions;
var loadedAPI = 'gmaps';

function init() {
  if (gm_error) { return gm_authFailure(); }
  google.maps.visualRefresh = true;
  polyOptions = {
    strokeColor: strokeColor,
    strokeOpacity: strokeOpacity,
    strokeWeight: strokeWeight
  }
  mapOptions = {
    center: new google.maps.LatLng(init_latitude, init_longitude),
    zoom: 8,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    scaleControl: true
  };
  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
}
function cleanup() {
  map = undefined;
  polies = undefined;
  markers = undefined;
  popups = undefined;
  popup = undefined;
  polyOptions = undefined;
  mapOptions = undefined;
  document.getElementById('map-canvas').innerHTML = '';
}

function displayTrack(xml, update) {
  altitudes = {};
  var totalMeters = 0;
  var totalSeconds = 0;
  // init polyline
  var poly = new google.maps.Polyline(polyOptions);
  poly.setMap(map);
  var path = poly.getPath();
  var latlngbounds = new google.maps.LatLngBounds();
  var positions = xml.getElementsByTagName('position');
  var posLen = positions.length;
  for (var i = 0; i < posLen; i++) {
    var p = parsePosition(positions[i], i);
    totalMeters += p.distance;
    totalSeconds += p.seconds;
    p.totalMeters = totalMeters;
    p.totalSeconds = totalSeconds;
    p.coordinates = new google.maps.LatLng(p.latitude, p.longitude);
    // set marker
    setMarker(p, i, posLen);
    // update polyline
    path.push(p.coordinates);
    latlngbounds.extend(p.coordinates);
  }
  if (update) {
    map.fitBounds(latlngbounds);
    if (i == 1) {
      // only one point, zoom out
      zListener =
        google.maps.event.addListenerOnce(map, 'bounds_changed', function (event) {
          if (this.getZoom()) {
            this.setZoom(15);
          }
        });
      setTimeout(function () { google.maps.event.removeListener(zListener) }, 2000);
    }
  }
  polies.push(poly);

  updateSummary(p.timestamp, totalMeters, totalSeconds);
  if (p.tid != trackid) {
    trackid = p.tid;
    setTrack(trackid);
  }
  if (document.getElementById('bottom').style.display == 'block') {
    // update altitudes chart
    chart.clearChart();
    displayChart();
  }
}

function clearMap() {
  if (polies) {
    for (var i = 0; i < polies.length; i++) {
      polies[i].setMap(null);
    }
  }
  if (markers) {
    for (var i = 0; i < markers.length; i++) {
      google.maps.event.removeListener(popups[i].listener);
      popups[i].setMap(null);
      markers[i].setMap(null);
    }
  }
  markers.length = 0;
  polies.length = 0;
  popups.lentgth = 0;
}

function setMarker(p, i, posLen) {
  // marker
  var marker = new google.maps.Marker({
    map: map,
    position: new google.maps.LatLng(p.latitude, p.longitude),
    title: (new Date(p.timestamp * 1000)).toLocaleString()
  });
  if (latest == 1) { marker.setIcon('images/marker-red.png') }
  else if (i == 0) { marker.setIcon('images/marker-green.png') }
  else if (i == posLen - 1) { marker.setIcon('images/marker-red.png') }
  else { marker.setIcon('images/marker-white.png') }
  // popup
  var content = getPopupHtml(p, i, posLen);
  popup = new google.maps.InfoWindow();
  popup.listener = google.maps.event.addListener(marker, 'click', (function (marker, content) {
    return function () {
      popup.setContent(content);
      popup.open(map, marker);
      if (document.getElementById('bottom').style.display == 'block') {
        var index = 0;
        for (var key in altitudes) {
          if (altitudes.hasOwnProperty(key) && key == i) {
            chart.setSelection([{ row: index, column: null }]);
            break;
          }
          index++;
        }
      }
    }
  })(marker, content));
  markers.push(marker);
  popups.push(popup);
}

function addChartEvent(chart, data) {
  google.visualization.events.addListener(chart, 'select', function () {
    if (popup) { popup.close(); clearTimeout(altTimeout); }
    var selection = chart.getSelection()[0];
    if (selection) {
      var id = data.getValue(selection.row, 0) - 1;
      var icon = markers[id].getIcon();
      markers[id].setIcon('images/marker-gold.png');
      altTimeout = setTimeout(function () { markers[id].setIcon(icon); }, 2000);
    }
  });
}

//((52.20105108685229, 20.789387865580238), (52.292069558807135, 21.172192736185707))
function getBounds() {
  var bounds = map.getBounds();
  var lat_sw = bounds.getSouthWest().lat();
  var lon_sw = bounds.getSouthWest().lng();
  var lat_ne = bounds.getNorthEast().lat();
  var lon_ne = bounds.getNorthEast().lng();
  return [lon_sw, lat_sw, lon_ne, lat_ne];
}

function zoomToExtent() {
  var latlngbounds = new google.maps.LatLngBounds();
  for (var i = 0; i < markers.length; i++) {
    var coordinates = new google.maps.LatLng(markers[i].position.lat(), markers[i].position.lng());
    latlngbounds.extend(coordinates);
  }
  map.fitBounds(latlngbounds);
}

function zoomToBounds(b) {
  var sw = new google.maps.LatLng(b[1], b[0]);
  var ne = new google.maps.LatLng(b[3], b[2]);
  var bounds = new google.maps.LatLngBounds(sw, ne);
  map.fitBounds(bounds);
}

function gm_authFailure() {
  gm_error = true;
  message = sprintf(lang['apifailure'], 'Google Maps');
  message += '<br><br>' + lang['gmauthfailure'];
  message += '<br><br>' + lang['gmapilink'];
  showModal(message);
};

function updateSize() {
  // ignore
}