5 files changed, 140 insertions, 0 deletions
diff --git a/lib/stop_areas_to_way_costs_converter.rb b/lib/stop_areas_to_way_costs_converter.rb
new file mode 100644
index 000000000..c6a00d31b
--- /dev/null
+++ b/lib/stop_areas_to_way_costs_converter.rb
@@ -0,0 +1,21 @@
+class StopAreasToWayCostsConverter
+  def initialize(stop_areas)
+    @stop_areas = stop_areas
+  end
+
+  def convert
+    @stop_areas.each_cons(2).map do |stop_area_pair|
+      WayCost.new(
+        departure: Geokit::LatLng.new(
+          stop_area_pair[0].latitude,
+          stop_area_pair[0].longitude
+        ),
+        arrival: Geokit::LatLng.new(
+          stop_area_pair[1].latitude,
+          stop_area_pair[1].longitude
+        ),
+        id: "#{stop_area_pair[0].id}-#{stop_area_pair[1].id}"
+      )
+    end
+  end
+end
diff --git a/lib/tom_tom.rb b/lib/tom_tom.rb
new file mode 100644
index 000000000..a1a2bda43
--- /dev/null
+++ b/lib/tom_tom.rb
@@ -0,0 +1,22 @@
+module TomTom
+  BASE_URL = 'https://api.tomtom.com'
+  @api_key = Rails.application.secrets.tomtom_api_key
+
+  @connection = Faraday.new(
+    url: BASE_URL,
+    params: {
+      key: @api_key
+    }
+  ) do |faraday|
+    faraday.use FaradayMiddleware::FollowRedirects, limit: 1
+    faraday.adapter Faraday.default_adapter
+  end
+
+  def self.enabled?
+    @api_key.present?
+  end
+
+  def self.batch(way_costs)
+    TomTom::Batch.new(@connection).batch(way_costs)
+  end
+end
diff --git a/lib/tom_tom/batch.rb b/lib/tom_tom/batch.rb
new file mode 100644
index 000000000..6ceb9c226
--- /dev/null
+++ b/lib/tom_tom/batch.rb
@@ -0,0 +1,54 @@
+module TomTom
+  class Batch
+    def initialize(connection)
+      @connection = connection
+    end
+
+    def batch(way_costs)
+      params = URI.encode_www_form({
+        travelMode: 'bus',
+        routeType: 'shortest'
+      })
+      batch_items = convert_way_costs(way_costs).map do |locations|
+        {
+          query: "/calculateRoute/#{locations}/json?#{params}"
+        }
+      end
+
+      response = @connection.post do |req|
+        req.url '/routing/1/batch/json'
+        req.headers['Content-Type'] = 'application/json'
+        req.body = {
+          batchItems: batch_items
+        }.to_json
+      end
+
+      extract_costs_to_way_costs!(
+        way_costs,
+        JSON.parse(response.body)
+      )
+    end
+
+    def extract_costs_to_way_costs!(way_costs, batch_json)
+      calculated_routes = batch_json['batchItems']
+      calculated_routes.each_with_index do |route, i|
+        next if route['statusCode'] != 200
+
+        distance = route['response']['routes'][0]['summary']['lengthInMeters']
+        time = route['response']['routes'][0]['summary']['travelTimeInSeconds']
+
+        way_costs[i].distance = distance
+        way_costs[i].time = time
+      end
+
+      way_costs
+    end
+
+    def convert_way_costs(way_costs)
+      way_costs.map do |way_cost|
+        "#{way_cost.departure.lat},#{way_cost.departure.lng}" \
+        ":#{way_cost.arrival.lat},#{way_cost.arrival.lng}"
+      end
+    end
+  end
+end
diff --git a/lib/way_cost.rb b/lib/way_cost.rb
new file mode 100644
index 000000000..9f860308c
--- /dev/null
+++ b/lib/way_cost.rb
@@ -0,0 +1,27 @@
+class WayCost
+  attr_reader :departure, :arrival, :id
+  attr_accessor :distance, :time
+
+  def initialize(
+    departure:,
+    arrival:,
+    distance: nil,
+    time: nil,
+    id: nil
+  )
+    @departure = departure
+    @arrival = arrival
+    @distance = distance
+    @time = time
+    @id = id
+  end
+
+  def ==(other)
+    other.is_a?(self.class) &&
+      @departure == other.departure &&
+      @arrival == other.arrival &&
+      @distance == other.distance &&
+      @time == other.time &&
+      @id == other.id
+  end
+end
diff --git a/lib/way_cost_collection_json_serializer.rb b/lib/way_cost_collection_json_serializer.rb
new file mode 100644
index 000000000..191871cca
--- /dev/null
+++ b/lib/way_cost_collection_json_serializer.rb
@@ -0,0 +1,16 @@
+class WayCostCollectionJSONSerializer
+  def self.dump(way_costs)
+    return if way_costs.nil?
+
+    costs_by_id = {}
+
+    way_costs.each do |way_cost|
+      costs_by_id[way_cost.id] = {
+        distance: way_cost.distance,
+        time: way_cost.time
+      }
+    end
+
+    JSON.dump(costs_by_id)
+  end
+end