defmodule Ammoprices.Scraping.CaliberMatcher do
  @moduledoc false

  def match(title, calibers) do
    downcased_title = String.downcase(title)
    prepped = Enum.map(calibers, &prepare_caliber/1)

    case Enum.find(prepped, fn caliber ->
           name_matches?(downcased_title, caliber) or alias_matches?(downcased_title, caliber)
         end) do
      nil -> nil
      caliber -> caliber.original
    end
  end

  defp prepare_caliber(caliber) do
    %{
      original: caliber,
      name: String.downcase(caliber.name),
      aliases: Enum.map(caliber.aliases, &String.downcase/1)
    }
  end

  defp name_matches?(downcased_title, caliber) do
    String.contains?(downcased_title, caliber.name)
  end

  defp alias_matches?(downcased_title, caliber) do
    Enum.any?(caliber.aliases, fn a ->
      String.contains?(downcased_title, a)
    end)
  end
end