//= require_self
//= require_tree ./directions_engines

var TURN_INSTRUCTIONS = [];

var ROUTING_POLYLINE = {
  color: '#03f',
  opacity: 0.3,
  weight: 10
};

var ROUTING_POLYLINE_HIGHLIGHT = {
  color: '#ff0',
  opacity: 0.5,
  weight: 12
};

OSM.DirectionsEngines = {
  list: [],
  add: function (supportsHTTPS, engine) {
    if (document.location.protocol == "http:" || supportsHTTPS) this.list.push(engine);
  }
};

OSM.Directions = function (map, name, jqSearch) {
  var r = {};

  TURN_INSTRUCTIONS = [
    "",
    I18n.t('javascripts.directions.instructions.continue_on'),      // 1
    I18n.t('javascripts.directions.instructions.slight_right'),     // 2
    I18n.t('javascripts.directions.instructions.turn_right'),       // 3
    I18n.t('javascripts.directions.instructions.sharp_right'),      // 4
    I18n.t('javascripts.directions.instructions.uturn'),            // 5
    I18n.t('javascripts.directions.instructions.sharp_left'),       // 6
    I18n.t('javascripts.directions.instructions.turn_left'),        // 7
    I18n.t('javascripts.directions.instructions.slight_left'),      // 8
    I18n.t('javascripts.directions.instructions.via_point'),        // 9
    I18n.t('javascripts.directions.instructions.follow'),           // 10
    I18n.t('javascripts.directions.instructions.roundabout'),       // 11
    I18n.t('javascripts.directions.instructions.leave_roundabout'), // 12
    I18n.t('javascripts.directions.instructions.stay_roundabout'),  // 13
    I18n.t('javascripts.directions.instructions.start'),            // 14
    I18n.t('javascripts.directions.instructions.destination'),      // 15
    I18n.t('javascripts.directions.instructions.against_oneway'),   // 16
    I18n.t('javascripts.directions.instructions.end_oneway')        // 17
  ];

  r.map = map;              // Leaflet map
  r.name = name;            // global variable name of this instance (needed for JSONP)
  r.jqSearch = jqSearch;    // JQuery object for search panel

  r.route_from = null;      // null=unset, false=awaiting response, [lat,lon]=geocoded
  r.route_to = null;        //  |
  r.awaitingGeocode = false;// true if the user has requested a route, but we're waiting on a geocode result
  r.awaitingRoute = false;  // true if we've asked the engine for a route and are waiting to hear back
  r.dragging = false;       // true if the user is dragging a start/end point
  r.viaPoints = [];         // not yet used

  r.polyline = null;        // Leaflet polyline object
  r.popup = null;           // Leaflet popup object
  r.marker_from = null;     // Leaflet from marker
  r.marker_to = null;       // Leaflet to marker

  r.chosenEngine = null;    // currently selected routing engine

  var icon_from = L.icon({
    iconUrl: <%= asset_path('marker-green.png').to_json %>,
    iconSize: [25, 41],
    iconAnchor: [12, 41],
    popupAnchor: [1, -34],
    shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
    shadowSize: [41, 41]
  });

  var icon_to = L.icon({
    iconUrl: <%= asset_path('marker-red.png').to_json %>,
    iconSize: [25, 41],
    iconAnchor: [12, 41],
    popupAnchor: [1, -34],
    shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
    shadowSize: [41, 41]
  });

  // Geocoding

  r.geocode = function (id, event) {
    var _this = this;
    var field = event.target;
    var v = event.target.value;
    var querystring = '<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(v) + '&format=json';
    // *** &accept-language=<%#= request.user_preferred_languages.join(',') %>
    r[field.id] = false;
    $.getJSON(querystring, function (json) {
      _this._gotGeocode(json, field);
    });
  };

  r._gotGeocode = function (json, field) {
    if (json.length == 0) {
      alert(I18n.t('javascripts.directions.errors.no_place'));
      r[field.id] = null;
      return;
    }
    field.value = json[0].display_name;
    var lat = Number(json[0].lat), lon = Number(json[0].lon);
    r[field.id] = [lat, lon];
    r.updateMarker(field.id);
    if (r.awaitingGeocode) {
      r.awaitingGeocode = false;
      r.requestRoute(true, true);
    }
  };

  // Drag and drop markers

  r.handleDrop = function (e) {
    var oe = e.originalEvent;
    var id = oe.dataTransfer.getData('id');
    var pt = L.DomEvent.getMousePosition(oe, map.getContainer());  // co-ordinates of the mouse pointer at present
    pt.x += Number(oe.dataTransfer.getData('offsetX'));
    pt.y += Number(oe.dataTransfer.getData('offsetY'));
    var ll = map.containerPointToLatLng(pt);
    r.createMarker(ll, id);
    r.setNumericInput(ll, id);
    r.requestRoute(true, false);
    // update to/from field
  };

  r.createMarker = function (latlng, id) {
    if (r[id]) r.map.removeLayer(r[id]);
    r[id] = L.marker(latlng, {
      icon: id == 'marker_from' ? icon_from : icon_to,
      draggable: true,
      name: id
    }).addTo(r.map);
    r[id].on('drag', r.markerDragged);
    r[id].on('dragend', r.markerDragged);
  };

  // Update marker from geocoded route input
  r.updateMarker = function (id) {
    var m = id.replace('route', 'marker');
    if (!r[m]) {
      r.createMarker(r[id], m);
      return;
    }
    var ll = r[m].getLatLng();
    if (ll.lat != r[id][0] || ll.lng != r[id][1]) {
      r.createMarker(r[id], m);
    }
  };

  // Marker has been dragged
  r.markerDragged = function (e) {
    r.dragging = (e.type == 'drag');    // true for drag, false for dragend
    if (r.dragging && !r.chosenEngine.draggable) return;
    if (r.dragging && r.awaitingRoute) return;
    r.setNumericInput(e.target.getLatLng(), e.target.options.name);
    r.requestRoute(!r.dragging, false);
  };

  // Set a route input field to a numeric value
  r.setNumericInput = function (ll, id) {
    var routeid = id.replace('marker', 'route');
    r[routeid] = [ll.lat, ll.lng];
    $("[name=" + routeid + "]:visible").val(Math.round(ll.lat * 10000) / 10000 + " " + Math.round(ll.lng * 10000) / 10000);
  };

  // Route-fetching UI

  r.requestRoute = function (isFinal, updateZoom) {
    if (r.route_from && r.route_to) {
      $(".query_wrapper.routing .spinner").show();
      r.awaitingRoute = true;
      r.chosenEngine.getRoute(isFinal, [r.route_from, r.route_to]);
      if (updateZoom) {
        r.map.fitBounds(L.latLngBounds([r.route_from, r.route_to]).pad(0.05));
      }
      // then, when the route has been fetched, it'll call the engine's gotRoute function
    } else if (r.route_from == false || r.route_to == false) {
      // we're waiting for a Nominatim response before we can request a route
      r.awaitingGeocode = true;
    }
  };

  // Take an array of Leaflet LatLngs and draw it as a polyline
  r.setPolyline = function (line) {
    if (r.polyline) map.removeLayer(r.polyline);
    r.polyline = L.polyline(line, ROUTING_POLYLINE).addTo(r.map);
  };

  // Take directions and write them out
  // data = { steps: array of [latlng, sprite number, instruction text, distance in metres, highlightPolyline] }
  // sprite numbers equate to OSRM's route_instructions turn values
  r.setItinerary = function (data) {
    // Create base table
    $("#content").removeClass("overlay-sidebar");
    $('#sidebar_content').empty();
    var html = ('<h2><a class="geolink" href="#" onclick="$(~.close_directions~).click();return false;">' +
      '<span class="icon close"></span></a>' + I18n.t('javascripts.directions.directions') +
      '</h2><p id="routing_summary">' +
      I18n.t('javascripts.directions.distance') + ': ' + r.formatDistance(data.distance) + '. ' +
      I18n.t('javascripts.directions.time') + ': ' + r.formatTime(data.time) + '.</p>' +
      '<table id="turnbyturn" />').replace(/~/g, "'");
    $('#sidebar_content').html(html);
    // Add each row
    var cumulative = 0;
    for (var i = 0; i < data.steps.length; i++) {
      var step = data.steps[i];
      // Distance
      var dist = step[3];
      if (dist < 5) {
        dist = "";
      }
      else if (dist < 200) {
        dist = Math.round(dist / 10) * 10 + "m";
      }
      else if (dist < 1500) {
        dist = Math.round(dist / 100) * 100 + "m";
      }
      else if (dist < 5000) {
        dist = Math.round(dist / 100) / 10 + "km";
      }
      else {
        dist = Math.round(dist / 1000) + "km";
      }
      // Add to table
      var row = $("<tr class='turn'/>");
      row.append("<td class='direction i" + step[1] + "'> ");
      row.append("<td class='instruction'>" + step[2]);
      row.append("<td class='distance'>" + dist);
      with ({ instruction: step[2], ll: step[0], lineseg: step[4] }) {
        row.on('click', function (e) {
          r.clickTurn(instruction, ll);
        });
        row.hover(function (e) {
          r.highlightSegment(lineseg);
        }, function (e) {
          r.unhighlightSegment();
        });
      }
      ;
      $('#turnbyturn').append(row);
      cumulative += step[3];
    }
    $('#sidebar_content').append('<p id="routing_credit">' + I18n.t('javascripts.directions.instructions.courtesy', {link: r.chosenEngine.creditline}) + '</p>');
  };

  r.clickTurn = function (instruction, latlng) {
    r.popup = L.popup().setLatLng(latlng).setContent("<p>" + instruction + "</p>").openOn(r.map);
  };

  r.highlightSegment = function (lineseg) {
    if (r.highlighted) map.removeLayer(r.highlighted);
    r.highlighted = L.polyline(lineseg, ROUTING_POLYLINE_HIGHLIGHT).addTo(r.map);
  };

  r.unhighlightSegment = function () {
    if (r.highlighted) map.removeLayer(r.highlighted);
  };

  r.formatDistance = function (m) {
    if (m < 1000) {
      return Math.round(m) + "m";
    }
    else if (m < 10000) {
      return (m / 1000.0).toFixed(1) + "km";
    }
    else {
      return Math.round(m / 1000) + "km";
    }
  };

  r.formatTime = function (s) {
    var m = Math.round(s / 60);
    var h = Math.floor(m / 60);
    m -= h * 60;
    return h + ":" + (m < 10 ? '0' : '') + m;
  };

  // Close all routing UI

  r.close = function () {
    $("#content").addClass("overlay-sidebar");
    r.route_from = r.route_to = null;
    $(".query_wrapper.routing input").val("");
    var remove = ['polyline', 'popup', 'marker_from', 'marker_to'];
    for (var i = 0; i < remove.length; i++) {
      if (r[remove[i]]) {
        map.removeLayer(r[remove[i]]);
        r[remove[i]] = null;
      }
    }
  };

  // Routing engine handling

  // Add all engines
  var list = OSM.DirectionsEngines.list;
  list.sort(function (a, b) {
    return I18n.t(a.name) > I18n.t(b.name);
  });
  var select = r.jqSearch.find('select.routing_engines');
  for (var i = 0; i < list.length; i++) {
    // Set up JSONP callback
    with ({num: i}) {
      list[num].requestJSONP = function (url) {
        var script = document.createElement('script');
        script.src = url + r.name + ".gotRoute" + num;
        document.body.appendChild(script);
      };
      list[num].requestCORS = function (url) {
        $.ajax({ url: url, method: "GET", data: {}, dataType: 'json', success: r['gotRoute' + num] });
      };
      r['gotRoute' + num] = function (data) {
        r.awaitingRoute = false;
        $(".query_wrapper.routing .spinner").hide();
        if (!list[num].gotRoute(r, data)) {
          // No route found
          if (r.polyline) {
            map.removeLayer(r.polyline);
            r.polyline = null;
          }
          if (!r.dragging) {
            alert(I18n.t('javascripts.directions.errors.no_route'));
          }
        }
      };
    }
    select.append("<option value='" + i + "'>" + I18n.t(list[i].name) + "</option>");
  }

  r.engines = list;
  r.chosenEngine = list[0]; // default to first engine

  // Choose an engine on dropdown change
  r.selectEngine = function (e) {
    r.chosenEngine = r.engines[e.target.selectedIndex];
    if (r.polyline) { // and if a route is currently showing, must also refresh, else confusion
      r.requestRoute(true, false);
    }
  };

  // Choose an engine by name
  r.chooseEngine = function (name) {
    for (var i = 0; i < r.engines.length; i++) {
      if (r.engines[i].name == name) {
        r.chosenEngine = r.engines[i];
        r.jqSearch.find('select.routing_engines').val(i);
      }
    }
  };

  $("input[name='route_from']").on("change", function (e) {
    r.geocode('route_from', e);
  });

  $("input[name='route_to']").on("change", function (e) {
    r.geocode('route_to', e);
  });

  $("select[name='routing_engines']").on("change", function (e) {
    r.selectEngine(e);
  });

  return r;
};