var map = null;
var geocoder = null;
var nbAddressesProcessed = 0; 
var requestDelay = 500;
var maxSliceSize = 20;
var slice = [];
var distanceNA = 'N/A';
var isStopped = false;
var statusDiv = null;
var markers = [];
var polylines = [];

var LOCATIONS = {

  index: -1,
  elements: [],
  
  processNext : function(noIncrement){
    if(typeof noIncrement=='undefined'){
      this.index++;
    }
    if(this.elements.length && this.index < this.elements.length){
      this.processCallback(this);
    }else{
      this.endCallback(this);
    }
  },
  
  set: function(property,value){
    this.elements[this.index][property] = value;
  },
  
  get : function(){
    return this.elements[this.index];
  }
  
}; 

function initGoogle(){
  var elem = document.getElementById('map');
  var options = {
    zoom: 2, 
    center: new google.maps.LatLng(51.500152,-0.126236), 
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  map = new google.maps.Map(elem, options);
  geocoder = new google.maps.Geocoder();
  statusDiv = document.getElementById('search-status').getElementsByTagName('div')[0];
}

function geolocateLocation1(callback){

  if(LOCATION1.id){
    LOCATION1.position = new google.maps.LatLng(LOCATION1.lat, LOCATION1.lng);
    callback();
    return;
  }
  
  geocoder.geocode({'address': LOCATION1.adr}, function(results, status){
   
    if(status != google.maps.GeocoderStatus.OK){
      alert('The address ['+LOCATION1.adr+'] has caused an error.\nGoogle Geocoder Status: '+status);
      return;
    }
    
    var position = results[0].geometry.location;
    LOCATION1.lat = position.lat();
    LOCATION1.lng = position.lng();
    
    jQuery.post('save-location1.php', {location: LOCATION1}, function(locationId){
      
      if(locationId){
        LOCATION1.id = locationId;
        LOCATION1.position = position;
        callback();
      }else{
        alert('The address ['+LOCATION1.adr+'] has caused an error.\nThe application could not save the location. '+locationId);
      }
      
    });
    
  });
  
}

function geolocateLocationsAll(){
  jQuery.get('get-locations.php?geosrc='+geosrc+'&locationId='+LOCATION1.id, function(json){
    jQuery('#btnStop').show();
    LOCATIONS.processCallback = geolocateLocationN;
    LOCATIONS.endCallback = geolocateLocationsEnd;
    LOCATIONS.elements = eval(json);
    LOCATIONS.processNext();
  });
}

function saveLocationOnServer(location, delay) {
  nbAddressesProcessed++;
  showDistance(location);
  slice.push(location);
  if(slice.length>=maxSliceSize){
    saveSlice();
    setTimeout(clearMarkers, 500);
    setTimeout(function(){ LOCATIONS.processNext(); }, 1000);
  }else{
    setTimeout(function(){ LOCATIONS.processNext(); }, delay);
  }
}

function geolocateLocationN(){
  
  if(isStopped){
    doAbort();
    return;
  }
  
  var location = LOCATIONS.get();
  
  if(location.dst){
    saveLocationOnServer(location, 0);
    return;
  }
 
  if(location.id){
    var position = new google.maps.LatLng(location.lat, location.lng);
    location.dst = google.maps.geometry.spherical.computeDistanceBetween(LOCATION1.position, position);
    saveLocationOnServer(location, 0);
    return;
  }

  geocoder.geocode({'address': location.adr}, function(results, status){
  
    if(status == google.maps.GeocoderStatus.OVER_QUERY_LIMIT){
        setTimeout(function(){
          LOCATIONS.processNext(false);
        }, 5000);
      return;
    }
    
    if(status != google.maps.GeocoderStatus.OK){
      $('#map').css('opacity','0.3');
      $('#options').show(666);
      $('#options h3 span').html(location.adr);
      $('#options input').val(location.adr);
      jQuery('#btnStop').hide();
     return;
    }
    
    var position = results[0].geometry.location;
    location.lat = position.lat();
    location.lng = position.lng();
    location.dst = google.maps.geometry.spherical.computeDistanceBetween(LOCATION1.position, position);
    
    saveLocationOnServer(location, requestDelay);
    
  });
  
}

function geolocateLocationsEnd(){
  setTimeout(saveSlice, 1000);
  jQuery('#search-complete').show();
  jQuery('#btnStop').hide();
}

function showDistance(location){
  var pos1 = LOCATION1.position;
  var pos2 = new google.maps.LatLng(location.lat, location.lng);
  var marker2 = new google.maps.Marker({position:pos2});
  var polyline = new google.maps.Polyline({path: [pos1,pos2], strokeColor: "#FF0000", strokeOpacity: 1.0,strokeWeight: 1});
  marker2.setMap(map);
  polyline.setMap(map);
  showStatus(location.adr, location.dst);
  if(!markers.length){
    var marker1 = new google.maps.Marker({position:pos1});
    marker1.setMap(map);
    markers.push(marker1);
  }
  markers.push(marker2);
  polylines.push(polyline);
}

function saveSlice(){
  if(slice.length){
    jQuery.post('save-locations.php?locationId='+LOCATION1.id, {locations:slice});
    slice = [];
  }
}

function doResume() {
  unhideMap();
  setTimeout(function(){
    LOCATIONS.set('adr', $('#options input').val());
    LOCATIONS.processNext(false);
  },1000);
}

function doSkip() {
  nbAddressesProcessed++;
  unhideMap();
  showStatus($('#options input').val(), distanceNA);
  LOCATIONS.set('dst', distanceNA);
  slice.push(LOCATIONS.get());
  LOCATIONS.processNext();
}

function doAbort() {
  unhideMap();
  showStatus($('#options input').val(), distanceNA);
  geolocateLocationsEnd();
}

function showStatus(address, distance) {
  if(distance!=distanceNA){
    distance = Math.ceil(distance/1000);
  }
  var str = 'Addresses processed: '+nbAddressesProcessed+' / '+LOCATIONS.elements.length;
  str += '<br>Last: '+distance+' km to '+address;
  statusDiv.innerHTML = str;
}

function unhideMap() {
  $('#map').css('opacity','1');
  $('#options').hide(500);
  jQuery('#btnStop').show();
}

function clearMarkers() {
  for (var i = 0; i < markers.length; i++) {
    markers[i].setMap(null);
  }
  for (var i = 0; i < polylines.length; i++) {
    polylines[i].setMap(null);
  }
  polylines = [];
  markers = [];
}