defmodule Scopes.CSys do
  alias Scopes.Core.Actor

  def neuron(proc, scope) do
    fn msg -> proc.(msg, scope) end
  end

  def synapse(rcvr, op) do
    fn msg -> Actor.send(rcvr, op.(msg)) end
  end

  # predefined neuron processors

  def echo(msg, {_state, _syns, env}) do
    send(env, msg)
  end

  def forward(msg, {_state, syns, _env}) do
    for s <- syns, do: s.(msg)
  end

  def std_proc({:parent}, {_state, _syns, env}) do
    syn = synapse(self(), &Function.identity/1)
    new = Actor.create(neuron(&std_proc/2, {nil, [syn], env}))
    send(env, {:created, new})
  end

  def std_proc(msg, scope) do
    if forward(msg, scope) === [], do: echo(msg, scope)
  end
end