defmodule Clacks.Paginator do
  import Ecto.Query

  def paginate(query, %{"max_id" => max_id}) do
    query
    |> where([a], a.id < ^max_id)
    |> order_by(desc: :id)
  end

  def paginate(query, %{"since_id" => since_id}) do
    query
    |> where([a], a.id > ^since_id)
    |> order_by(desc: :id)
  end

  def paginate(query, %{"min_id" => min_id}) do
    query
    |> where([a], a.id > ^min_id)
    |> order_by(asc: :id)
  end

  def paginate(query, _params) do
    query
    |> order_by(desc: :id)
  end
end