vaccins/lib/vaccins/queries.ex

defmodule Vaccins.Queries do
  defmodule Query do
    @callback to_url(any) :: String.t()
  end

  defmodule Doctolib do
    @behaviour Query
    alias __MODULE__, as: Doctolib

    defstruct [
      :start_date,
      :visit_motive_ids,
      :agenda_ids,
      :practice_ids,
      :limit,
      insurance_sector: "public",
      destroy_temporary: true,
      _converter: Doctolib
    ]

    def new(kw_list),
      do:
        struct(Doctolib, kw_list)
        |> Map.replace(:start_date, Date.utc_today() |> Date.to_string())

    def motives(), do: %{premiere_injection_pfizer: 2_743_305}
    def practices(), do: %{fontenay: 180_541}

    def to_url(q = %__MODULE__{}) do
      query_string = q |> Map.from_struct() |> URI.encode_query()

      %URI{
        authority: "partners.doctolib.fr",
        fragment: nil,
        host: "partners.doctolib.fr",
        path: "/availabilities.json",
        port: 443,
        query: query_string,
        scheme: "https",
        userinfo: nil
      }
    end

    def analyze_result(%{total: 0}), do: {:error, :no_availability}

    def analyze_result(%{total: t, availabilities: avail_list}) when t > 0 do
      {:ok,
       avail_list
       |> Enum.reject(&(&1.slots |> Enum.empty?()))
       |> Enum.map(& &1.slots)
       |> Enum.concat()
       |> Enum.map(&(&1 |> Map.take([:start_date, :end_date])))}
    end
  end

  def valid_queries(),
    do: [
      %{
        id: "Centre de Vaccination - Salle Olympe de Gouges",
        availability_query:
          Doctolib.new(
            visit_motive_ids: 2_549_915,
            agenda_ids:
              "434477-434486-434466-434472-440075-440077-440078-415625-434490-462178-462452-433984-462177-433604-433601-415628-440074-433997-434489-440076",
            practice_ids: 164_922,
            limit: 7
          ),
        booking_page:
          "https://partners.doctolib.fr/centre-de-sante/fontenay-sous-bois/centre-de-vaccination-covid-19-fontenay-sous-bois?pid=practice-180541"
      },
      %{
        id: "Centre de Vaccination - Paris 20e",
        availability_query:
          Doctolib.new(
            visit_motive_ids: 2_549_915,
            agenda_ids:
              "463167-415613-463168-415615-429620-434343-463166-463170-463171-447048-440655-434052-440654-462614-462613-433994-434337-434338",
            practice_ids: 166_459,
            limit: 3
          ),
        booking_page:
          "https://www.doctolib.fr/centre-de-sante/paris/centre-de-vaccination-covid-19-ville-de-paris?pid=practice-166459"
      },
      %{
        id: "Hotel de ville de Fontenay-sous-Bois",
        availability_query:
          Doctolib.new(
            visit_motive_ids: 2_743_304,
            agenda_ids: "449169-449170-466472",
            practice_ids: 180_541,
            limit: 15
          ),
        booking_page:
          "https://partners.doctolib.fr/centre-de-sante/fontenay-sous-bois/centre-de-vaccination-covid-19-fontenay-sous-bois?pid=practice-180541&enable_cookies_consent=1"
      }
    ]
end