//= require_self
//= require_tree ./directions_engines

OSM.Directions = function (map) {
  var awaitingGeocode; // true if the user has requested a route, but we're waiting on a geocode result
  var awaitingRoute;   // true if we've asked the engine for a route and are waiting to hear back
  var dragging;        // true if the user is dragging a start/end point
  var chosenEngine;

  var popup = L.popup();

  var polyline = L.polyline([], {
    color: '#03f',
    opacity: 0.3,
    weight: 10
  });

  var highlight = L.polyline([], {
    color: '#ff0',
    opacity: 0.5,
    weight: 12
  });

  var endpoints = [
    Endpoint($("input[name='route_from']"), <%= asset_path('marker-green.png').to_json %>),
    Endpoint($("input[name='route_to']"),   <%= asset_path('marker-red.png').to_json %>)
  ];

  function Endpoint(input, iconUrl) {
    var endpoint = {};

    endpoint.marker = L.marker([0, 0], {
      icon: L.icon({
        iconUrl: iconUrl,
        iconSize: [25, 41],
        iconAnchor: [12, 41],
        popupAnchor: [1, -34],
        shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
        shadowSize: [41, 41]
      }),
      draggable: true
    });

    endpoint.marker.on('drag dragend', function (e) {
      dragging = (e.type == 'drag');
      if (dragging && !chosenEngine.draggable) return;
      if (dragging && awaitingRoute) return;
      endpoint.setLatLng(e.target.getLatLng());
      r.requestRoute(!dragging, false);
    });

    input.on("change", function (e) {
      endpoint.awaitingGeocode = true;

      $.getJSON('<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(e.target.value) + '&format=json', function (json) {
        endpoint.awaitingGeocode = false;

        if (json.length == 0) {
          alert(I18n.t('javascripts.directions.errors.no_place'));
          return;
        }

        input.val(json[0].display_name);

        endpoint.latlng = L.latLng(json[0]);
        endpoint.marker
          .setLatLng(endpoint.latlng)
          .addTo(map);

        if (awaitingGeocode) {
          awaitingGeocode = false;
          r.requestRoute(true, true);
        }
      });
    });

    endpoint.setLatLng = function (ll) {
      input.val(Math.round(ll.lat * 10000) / 10000 + " " + Math.round(ll.lng * 10000) / 10000);
      endpoint.latlng = ll;
      endpoint.marker
        .setLatLng(ll)
        .addTo(map);
    };

    return endpoint;
  }

  function formatDistance(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";
    }
  }

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

  var engines = OSM.Directions.engines;

  engines.sort(function (a, b) {
    return I18n.t(a.name) > I18n.t(b.name);
  });

  var select = $('select.routing_engines');

  for (var i = 0; i < engines.length; i++) {
    var engine = engines[i];

    select.append("<option value='" + i + "'>" + I18n.t(engine.name) + "</option>");

    if (engine.name == 'javascripts.directions.engines.osrm_car') {
      chosenEngine = engine;
      select.val(i);
    }
  }

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

  $(".get_directions").on("click", function (e) {
    e.preventDefault();
    $(".search").hide();
    $(".routing").show();
    $(".search_form input[type='submit']").addClass("routing_submit");
    $(".query_wrapper.routing [name=route_from]").focus();

    $("#map").on('dragend dragover', function (e) {
      e.preventDefault();
    });

    $("#map").on('drop', function (e) {
      e.preventDefault();
      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);
      endpoints[id === 'marker_from' ? 0 : 1].setLatLng(ll);
      r.requestRoute(true, false);
    });

    $(".routing_marker").on('dragstart', function (e) {
      e.originalEvent.dataTransfer.effectAllowed = 'move';
      e.originalEvent.dataTransfer.setData('id', this.id);
      var xo = e.originalEvent.clientX - $(e.target).offset().left;
      var yo = e.originalEvent.clientY - $(e.target).offset().top;
      e.originalEvent.dataTransfer.setData('offsetX', e.originalEvent.target.width / 2 - xo);
      e.originalEvent.dataTransfer.setData('offsetY', e.originalEvent.target.height - yo);
    });
  });

  $(".close_directions").on("click", function (e) {
    e.preventDefault();
    $(".search").show();
    $(".routing").hide();
    $(".search_form input[type='submit']").removeClass("routing_submit");
    $("#content").addClass("overlay-sidebar");
    $(".query_wrapper.routing input").val("");
    map
      .removeLayer(popup)
      .removeLayer(polyline)
      .removeLayer(endpoints[0].marker)
      .removeLayer(endpoints[1].marker);
    endpoints[0].latlng = endpoints[1].latlng = null;
    $("#map").off('dragend drop dragover');
    $(".routing_marker").off('dragstart');
    $(".query_wrapper.search [name=query]").focus();
  });

  var r = {};

  r.requestRoute = function (isFinal, updateZoom) {
    if (endpoints[0].awaitingGeocode || endpoints[1].awaitingGeocode) {
      awaitingGeocode = true;
      return;
    }

    var origin = endpoints[0].latlng,
      destination = endpoints[1].latlng;

    if (!origin || !destination) {
      return;
    }

    $(".query_wrapper.routing .spinner").show();
    awaitingRoute = true;

    if (updateZoom) {
      map.fitBounds(L.latLngBounds(origin, destination).pad(0.05));
    }

    chosenEngine.getRoute(isFinal, [origin, destination], function (err, route) {
      awaitingRoute = false;

      $(".query_wrapper.routing .spinner").hide();

      if (err) {
        map.removeLayer(polyline);

        if (!dragging) {
          alert(I18n.t('javascripts.directions.errors.no_route'));
        }

        return;
      }

      polyline
        .setLatLngs(route.line)
        .addTo(map);

      $("#content").removeClass("overlay-sidebar");

      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') + ': ' + formatDistance(route.distance) + '. ' +
        I18n.t('javascripts.directions.time') + ': ' + formatTime(route.time) + '.</p>' +
        '<table id="turnbyturn" />').replace(/~/g, "'");

      $('#sidebar_content')
        .html(html);

      // Add each row
      var cumulative = 0;
      route.steps.forEach(function (step) {
        var ll        = step[0],
          direction   = step[1],
          instruction = step[2],
          dist        = step[3],
          lineseg     = step[4];

        cumulative += dist;

        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";
        }

        var row = $("<tr class='turn'/>");
        row.append("<td class='direction i" + direction + "'> ");
        row.append("<td class='instruction'>" + instruction);
        row.append("<td class='distance'>" + dist);

        row.on('click', function () {
          popup
            .setLatLng(ll)
            .setContent("<p>" + instruction + "</p>")
            .openOn(map);
        });

        row.hover(function () {
          highlight
            .setLatLngs(lineseg)
            .addTo(map);
        }, function () {
          map.removeLayer(highlight);
        });

        $('#turnbyturn').append(row);
      });

      $('#sidebar_content').append('<p id="routing_credit">' +
        I18n.t('javascripts.directions.instructions.courtesy', {link: chosenEngine.creditline}) +
        '</p>');
    });
  };

  return r;
};

OSM.Directions.engines = [];

OSM.Directions.addEngine = function (engine, supportsHTTPS) {
  if (document.location.protocol == "http:" || supportsHTTPS) {
    OSM.Directions.engines.push(engine);
  }
};