defmodule PhilomenaWeb.PaginationPlug do import Plug.Conn alias Pow.Plug # No options def init([]), do: [] # Assign pagination info def call(conn, _opts) do conn = conn |> fetch_query_params() user = conn |> Plug.current_user() params = conn.params page_size = get_page_size(params) page_number = get_page_number(params) image_page_size = page_size || image_page_size(user) comment_page_size = page_size || comment_page_size(user) conn |> assign(:pagination, %{page_number: page_number, page_size: page_size || 25}) |> assign(:image_pagination, %{page_number: page_number, page_size: image_page_size}) |> assign(:scrivener, page: page_number, page_size: page_size || 25) |> assign(:comment_scrivener, page: page_number, page_size: comment_page_size) end defp get_page_number(%{"page" => page}) do to_integer(page) || 1 end defp get_page_number(_params), do: 1 defp get_page_size(%{"per_page" => per_page}) do per_page |> to_integer() |> Kernel.||(25) |> max(1) |> min(50) end defp get_page_size(_params), do: nil defp to_integer(string) do case Integer.parse(string) do {int, _rest} -> int _ -> nil end end defp image_page_size(%{images_per_page: x}), do: x defp image_page_size(_user), do: 15 defp comment_page_size(%{comments_per_page: x}), do: x defp comment_page_size(_user), do: 25 end