defmodule Nola.Plugins.Base do

  def irc_doc, do: nil

  def start_link() do
    GenServer.start_link(__MODULE__, [], name: __MODULE__)
  end

  def init([]) do
    regopts = [plugin: __MODULE__]
    {:ok, _} = Registry.register(IRC.PubSub, "trigger:version", regopts)
    {:ok, _} = Registry.register(IRC.PubSub, "trigger:help", regopts)
    {:ok, _} = Registry.register(IRC.PubSub, "trigger:liquidrender", regopts)
    {:ok, _} = Registry.register(IRC.PubSub, "trigger:plugin", regopts)
    {:ok, _} = Registry.register(IRC.PubSub, "trigger:plugins", regopts)
    {:ok, nil}
  end

  def handle_info({:irc, :trigger, "plugins", msg = %{trigger: %{type: :bang, args: []}}}, _) do
    enabled_string = Nola.Plugins.enabled()
    |> Enum.map(fn(mod) ->
      mod
      |> Macro.underscore()
      |> String.split("/", parts: :infinity)
      |> List.last()
      |> Enum.sort()
    end)
    |> Enum.join(", ")
    msg.replyfun.("Enabled plugins: #{enabled_string}")
    {:noreply, nil}
  end

  def handle_info({:irc, :trigger, "plugin", %{trigger: %{type: :query, args: [plugin]}} = m}, _) do
    module = Module.concat([Nola.Plugins, Macro.camelize(plugin)])
    with true <- Code.ensure_loaded?(module),
         pid when is_pid(pid) <- GenServer.whereis(module)
    do
      m.replyfun.("loaded, active: #{inspect(pid)}")
    else
      false -> m.replyfun.("not loaded")
      nil ->
        msg = case Nola.Plugins.get(module) do
          :disabled -> "disabled"
          {_, false, _} -> "disabled"
          _ -> "not active"
        end
        m.replyfun.(msg)
    end
    {:noreply, nil}
  end

  def handle_info({:irc, :trigger, "plugin", %{trigger: %{type: :plus, args: [plugin]}} = m}, _) do
    module = Module.concat([Nola.Plugins, Macro.camelize(plugin)])
    with true <- Code.ensure_loaded?(module),
         Nola.Plugins.switch(module, true),
         {:ok, pid} <- Nola.Plugins.start(module)
    do
      m.replyfun.("started: #{inspect(pid)}")
    else
      false -> m.replyfun.("not loaded")
      :ignore -> m.replyfun.("disabled or throttled")
      {:error, _} -> m.replyfun.("start error")
    end
    {:noreply, nil}
  end

  def handle_info({:irc, :trigger, "plugin", %{trigger: %{type: :tilde, args: [plugin]}} = m}, _) do
    module = Module.concat([Nola.Plugins, Macro.camelize(plugin)])
    with true <- Code.ensure_loaded?(module),
         pid when is_pid(pid) <- GenServer.whereis(module),
         :ok <- GenServer.stop(pid),
         {:ok, pid} <- Nola.Plugins.start(module)
    do
      m.replyfun.("restarted: #{inspect(pid)}")
    else
      false -> m.replyfun.("not loaded")
      nil -> m.replyfun.("not active")
    end
    {:noreply, nil}
  end


  def handle_info({:irc, :trigger, "plugin", %{trigger: %{type: :minus, args: [plugin]}} = m}, _) do
    module = Module.concat([Nola.Plugins, Macro.camelize(plugin)])
    with true <- Code.ensure_loaded?(module),
         pid when is_pid(pid) <- GenServer.whereis(module),
         :ok <- GenServer.stop(pid)
    do
      IRC.Plugin.switch(module, false)
      m.replyfun.("stopped: #{inspect(pid)}")
    else
      false -> m.replyfun.("not loaded")
      nil -> m.replyfun.("not active")
    end
    {:noreply, nil}
  end

  def handle_info({:irc, :trigger, "liquidrender", m = %{trigger: %{args: args}}}, _) do
    template = Enum.join(args, " ")
    m.replyfun.(Tmpl.render(template, m))
    {:noreply, nil}
  end

  def handle_info({:irc, :trigger, "help", m = %{trigger: %{type: :bang}}}, _) do
    url = NolaWeb.Router.Helpers.irc_url(NolaWeb.Endpoint, :index, m.network, NolaWeb.format_chan(m.channel))
    m.replyfun.("-> #{url}")
    {:noreply, nil}
  end

  def handle_info({:irc, :trigger, "version", message = %{trigger: %{type: :bang}}}, _) do
    {:ok, vsn} = :application.get_key(:nola, :vsn)
    ver = List.to_string(vsn)
    url = NolaWeb.Router.Helpers.irc_url(NolaWeb.Endpoint, :index)
    elixir_ver = Application.started_applications() |> List.keyfind(:elixir, 0) |> elem(2) |> to_string()
    otp_ver = :erlang.system_info(:system_version) |> to_string() |> String.trim()
    system = :erlang.system_info(:system_architecture) |> to_string()
    brand = Nola.brand(:name)
    owner = "#{Nola.brand(:owner)} <#{Nola.brand(:owner_email)}>"
    message.replyfun.([
       <<"🤖 I am a robot running", 2, "#{brand}, version #{ver}", 2, " — source: #{Nola.source_url()}">>,
      "🦾 Elixir #{elixir_ver} #{otp_ver} on #{system}",
      "👷‍♀️ Owner: h#{owner}",
      "🌍 Web interface: #{url}"
    ])
    {:noreply, nil}
  end

  def handle_info(msg, _) do
    {:noreply, nil}
  end

end