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defmodule IRC do

  defmodule Message do
    @derive {Poison.Encoder, except: [:replyfun]}
    defstruct [:id,
      :text,
      {:transport, :irc},
      :network,
               :account,
               :sender,
               :channel,
               :trigger,
               :replyfun,
               :at,
               {:meta, %{}}
              ]
  end
  defmodule Trigger do
    @derive Poison.Encoder
    defstruct [:type, :trigger, :args]
  end

  def send_message_as(account, network, channel, text, force_puppet \\ false) do
    connection = IRC.Connection.get_network(network)
    if connection && (force_puppet || IRC.PuppetConnection.whereis(account, connection)) do
      IRC.PuppetConnection.start_and_send_message(account, connection, channel, text)
    else
      user = IRC.UserTrack.find_by_account(network, account)
      nick = if(user, do: user.nick, else: account.name)
      IRC.Connection.broadcast_message(network, channel, "<#{nick}> #{text}")
    end
  end

  def register(key) do
    case Registry.register(Nola.PubSub, key, []) do
      {:ok, _} -> :ok
      error -> error
    end
  end

  def admin?(%Message{sender: sender}), do: admin?(sender)

  def admin?(%{nick: nick, user: user, host: host}) do
    for {n, u, h} <- Nola.IRC.env(:admins, []) do
      admin_part_match?(n, nick) && admin_part_match?(u, user) && admin_part_match?(h, host)
    end
    |> Enum.any?
  end

  defp admin_part_match?(:_, _), do: true
  defp admin_part_match?(a, a), do: true
  defp admin_part_match?(_, _), do: false

  @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