snmpkit

defmodule SnmpKit.SnmpMgr.Supervisor do
  @moduledoc """
  Main supervisor for the SnmpMgr streaming PDU engine infrastructure.

  This supervisor manages all Phase 5 components including engines, routers,
  connection pools, circuit breakers, and metrics collection.
  """

  use Supervisor
  require Logger

  def start_link(opts \\ []) do
    name = Keyword.get(opts, :name, SnmpKit.SnmpMgr.EngineSupervisor)
    Supervisor.start_link(__MODULE__, opts, name: name)
  end

  @impl true
  def init(opts) do
    # Configuration
    engine_config = Keyword.get(opts, :engine, [])
    router_config = Keyword.get(opts, :router, [])
    _pool_config = Keyword.get(opts, :pool, [])
    circuit_breaker_config = Keyword.get(opts, :circuit_breaker, [])
    metrics_config = Keyword.get(opts, :metrics, [])

    children = [
      # Metrics collection (start first)
      {SnmpKit.SnmpMgr.Metrics, metrics_config},

      # Circuit breaker
      {SnmpKit.SnmpMgr.CircuitBreaker, circuit_breaker_config},

      # Connection pool (temporarily disabled - not yet implemented)
      # {SnmpKit.SnmpMgr.Pool, pool_config},

      # Main engines (can have multiple)
      Supervisor.child_spec(
        {SnmpKit.SnmpMgr.Engine, Keyword.put(engine_config, :name, :engine_1)},
        id: :engine_1
      ),
      Supervisor.child_spec(
        {SnmpKit.SnmpMgr.Engine, Keyword.put(engine_config, :name, :engine_2)},
        id: :engine_2
      ),

      # Router (coordinates engines)
      {SnmpKit.SnmpMgr.Router,
       Keyword.merge(router_config,
         engines: [
           %{name: :engine_1, weight: 1, max_load: 100},
           %{name: :engine_2, weight: 1, max_load: 100}
         ]
       )}
    ]

    Logger.info("Starting SnmpMgr Phase 5 infrastructure")

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