defmodule Symbiont.Telepathy.Supervisor do
  @moduledoc """
  Supervision subtree for Telepathy (email communication layer).

  Children (start order matters — rest_for_one strategy):
    - MessageStore — JSONL-backed message persistence (must start first)
    - JMAP         — Fastmail JMAP client with periodic inbox polling
    - SMTP         — gen_smtp listener on port 25 (inbound email receiver)

  The `rest_for_one` strategy ensures that if MessageStore crashes, JMAP and
  SMTP are also restarted (they depend on MessageStore being available).
  """
  use Supervisor

  def start_link(opts) do
    Supervisor.start_link(__MODULE__, opts, name: __MODULE__)
  end

  @impl true
  def init(opts) do
    messages_path = Keyword.get(opts, :messages_path, "/data/telepathy/messages.jsonl")
    poll_interval_ms = Keyword.get(opts, :poll_interval_ms, 60_000)
    smtp_port = Keyword.get(opts, :smtp_port, 25)

    children = [
      {Symbiont.Telepathy.MessageStore, path: messages_path},
      {Symbiont.Telepathy.JMAP, poll_interval_ms: poll_interval_ms},
      {Symbiont.Telepathy.SMTP, smtp_port: smtp_port}
    ]

    Supervisor.init(children, strategy: :rest_for_one)
  end
end