defmodule Frenzy.Group do
  use Ecto.Schema
  import Ecto.Changeset
  alias FrenzyWeb.Router.Helpers, as: Routes
  alias FrenzyWeb.Endpoint

  def to_fever_group(group) do
    %{
      id: group.id,
      title: group.title
    }
  end

  def to_fever_feeds_group(group) do
    %{
      group_id: group.id,
      feed_ids: group.feeds |> Enum.map(fn feed -> feed.id end) |> Enum.join(",")
    }
  end

  def to_fervor(group) do
    %{
      id: group.id |> Integer.to_string(),
      title: group.title,
      feed_ids: group.feeds |> Enum.map(&Integer.to_string(&1.id)),
      service_url:
        Application.get_env(:frenzy, :base_url) <> Routes.group_path(Endpoint, :show, group.id)
    }
  end

  schema "groups" do
    field :title, :string

    belongs_to :user, Frenzy.User

    has_many :feeds, Frenzy.Feed, on_delete: :delete_all

    timestamps()
  end

  @type t() :: %__MODULE__{
          __meta__: Ecto.Schema.Metadata.t(),
          id: integer() | nil,
          title: String.t(),
          user: Frenzy.User.t() | Ecto.Association.NotLoaded.t(),
          feeds: [Frenzy.Feed.t()] | Ecto.Association.NotLoaded.t(),
          inserted_at: NaiveDateTime.t(),
          updated_at: NaiveDateTime.t()
        }

  @doc false
  def changeset(group, attrs) do
    group
    |> cast(attrs, [:title])
    |> validate_required([:title])
  end
end