defmodule GoogleDirectionsGenerator do
  @moduledoc """
  Generate Geoocords for random locations located nearby
  """

  @doc """
  ## Run The Module

  """

  @types  [
"accounting", "airport", "amusement_park", "aquarium", "art_gallery", "atm", "bakery", "bank", "bar", "beauty_salon", "bicycle_store", "book_store", "bowling_alley", "bus_station", "cafe", "campground", "car_dealer", "car_rental", "car_repair", "car_wash", "casino", "cemetery", "church", "city_hall", "clothing_store", "convenience_store", "courthouse", "dentist", "department_store", "doctor", "electrician", "electronics_store", "embassy", "fire_station", "florist", "funeral_home", "furniture_store", "gas_station", "gym", "hair_care", "hardware_store", "hindu_temple", "home_goods_store", "hospital", "insurance_agency", "jewelry_store", "laundry", "lawyer", "library", "liquor_store", "local_government_office", "locksmith", "lodging", "meal_delivery", "meal_takeaway", "mosque", "movie_rental", "movie_theater", "moving_company", "museum", "night_club", "painter", "park", "parking", "pet_store", "pharmacy", "physiotherapist", "plumber", "police", "post_office", "real_estate_agency", "restaurant", "roofing_contractor", "rv_park", "school", "shoe_store", "shopping_mall", "spa", "stadium", "storage", "store", "subway_station", "synagogue", "taxi_stand", "train_station", "transit_station", "travel_agency", "university", "veterinary_care", "zoo"
  ]


  def run do
    random
  end

  @doc """
  ## Get a random place geocoords based on starting location
  """
  def random do

    key = Application.get_env(:google_directions_generator, :api_key)
    url = "https://www.googleapis.com/geolocation/v1/geolocate?key=" <> key
    result = HTTPotion.post url
    json = result.body

    decoded = Poison.decode!(json)
    coords = decoded["location"]

    lat = to_string coords["lat"]
    lng = to_string coords["lng"]

    type = Enum.random(@types)

    url = "https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=" <> lat <> "," <> lng <> "&radius=5000&type="<> type <>"&key=" <> key
    result = HTTPotion.post url
    json = result.body

    decoded_json = Poison.decode!(json)

    reply = case decoded_json do
      %{"html_attributions" => [], "results" => [], "status" => "ZERO_RESULTS"} -> random
      _-> decoded_json["results"]
    end

    locations  = Enum.map(reply, fn(x) ->
    get_coords(x)
    end)


    trip_coords = create_route(locations)
  end

  def get_coords(loc)do


case loc do
  %{ lat: lat, lng: lng, name: name } -> loc
  _-> geometry = loc["geometry"]
      coords = geometry["location"]
      name = loc["name"]

      %{ name: name, lat: coords["lat"], lng: coords["lng"] }

end

end

def create_route(locations) do
 key = Application.get_env(:google_directions_generator, :api_key)

chunked_locations = Enum.chunk(locations, 2)

url = "https://maps.googleapis.com/maps/api/directions/json?origin=Boston,MA&destination=Concord,MA&waypoints=Charlestown,MA&key=" <> key
 result = HTTPotion.post url
    json = result.body
    waypoints_json = Poison.decode!(json)
    [routes] = waypoints_json["routes"]
    legs = routes["legs"]

   steps = Enum.map(legs, fn(x) ->
    x["steps"]
   end)

    waypoints = List.flatten(steps)
      |> Enum.map(fn(x) ->
      start_loc = Map.get(x, "start_location")
      start_map = %{ lat: start_loc["lat"], lng: start_loc["lng"] }
      end_loc = Map.get(x, "end_location")
      end_map = %{ lat: end_loc["lat"], lng: end_loc["lng"] }
      %{ start_location: start_map, end_location: end_map }
      end)

end
end