defmodule Nola.Irc.Message do
  @max_chars 440

  def splitlong(string, max_chars \\ 440)

  def splitlong(string, max_chars) when is_list(string) do
    Enum.map(string, fn s -> splitlong(s, max_chars) end)
    |> List.flatten()
  end

  def splitlong(string, max_chars) do
    string
    |> String.codepoints()
    |> Enum.chunk_every(max_chars)
    |> Enum.map(&Enum.join/1)
  end

  def splitlong_with_prefix(string, prefix, max_chars \\ 440) do
    prefix = "#{prefix} "
    max_chars = max_chars - length(String.codepoints(prefix))

    string
    |> String.codepoints()
    |> Enum.chunk_every(max_chars)
    |> Enum.map(fn line -> prefix <> Enum.join(line) end)
  end
end