defmodule CoreUtils.GeoJson do
  @moduledoc """
  Provides functions to return workers with geojson format
  """

  @spec worker_list_to_geojson([map]) :: map
  def worker_list_to_geojson(worker_list) do
    %{
      type: "FeatureCollection",
      features: get_workers_features(worker_list)
    }
  end

  @spec get_workers_features([map]) :: list
  def get_workers_features(worker_list) do
    Enum.map(worker_list, &map_feature/1)
  end

  @spec map_feature([any]) :: map
  def map_feature([worker_id, worker_vehicle_id, lon, lat, service_id, task_id, properties, inserted_at]) do
    properties = properties || %{}

    custom_properties = %{
      inserted_at: inserted_at,
      lat: lat,
      lon: lon,
      service_id: service_id,
      task_id: task_id,
      user_id: worker_id,
      worker_vehicle_id: worker_vehicle_id
    }
    |> Enum.reject(fn {_, value} -> is_nil(value) end)
    |> Map.new

    %{
      type: "Feature",
      properties: Map.merge(properties, custom_properties),
      geometry: %{
        type: "Point",
        coordinates: [lon, lat]
      }
    }
  end

  def map_feature([worker_id, worker_vehicle_id, lon, lat, distance]) do
    %{
      type: "Feature",
      properties: %{
        user_id: worker_id,
        worker_vehicle_id: worker_vehicle_id,
        lat: lat,
        lon: lon,
        distance: distance
      },
      geometry: %{
        type: "Point",
        coordinates: [lon, lat]
      }
    }
  end

  def map_feature([worker_id, worker_vehicle_id, lon, lat]) do
    %{
      type: "Feature",
      properties: %{
        user_id: worker_id,
        worker_vehicle_id: worker_vehicle_id,
        lat: lat,
        lon: lon
      },
      geometry: %{
        type: "Point",
        coordinates: [lon, lat]
      }
    }
  end

  def map_feature([]), do: %{}
  def map_feature(nil), do: %{}
end