# frozen_string_literal: true

# Chiude sessioni abbandonate che altrimenti occupano slot MediaMTX e
# fanno scattare warm-spare / scale-out Hetzner.
#
# - idle: wizard aperti e mai partiti (default 30 min)
# - connecting / reconnecting: hang senza go_live (default 6 h)
class CleanupExpiredSessionsJob
  include Sidekiq::Job

  def perform
    closed_idle = sweep_idle!
    closed_stale = sweep_stale_connect!
    Rails.logger.info(
      "[CleanupExpiredSessionsJob] idle_closed=#{closed_idle} stale_closed=#{closed_stale} " \
      "idle_minutes=#{self.class.idle_minutes} stale_hours=#{self.class.stale_hours}"
    )
  end

  def self.idle_minutes
    ENV.fetch("STREAM_SESSION_IDLE_MINUTES", "30").to_i
  end

  def self.stale_hours
    ENV.fetch("STREAM_SESSION_STALE_HOURS", "6").to_i
  end

  private

  def sweep_idle!
    cutoff = self.class.idle_minutes.minutes.ago
    count = 0
    StreamSession.where(status: "idle").where("updated_at < ?", cutoff).find_each do |session|
      close!(session, reason: "idle_timeout")
      count += 1
    end
    count
  end

  def sweep_stale_connect!
    cutoff = self.class.stale_hours.hours.ago
    count = 0
    StreamSession.where(status: %w[connecting reconnecting])
                 .where("updated_at < ?", cutoff)
                 .find_each do |session|
      close!(session, reason: "stale_#{session.status}")
      count += 1
    end
    count
  end

  def close!(session, reason:)
    session.stream_events.create!(
      event_type: "error",
      metadata: { reason: reason },
      occurred_at: Time.current
    )
    Sessions::Stop.new(session).call
  rescue StandardError => e
    Rails.logger.warn(
      "[CleanupExpiredSessionsJob] session=#{session.id} reason=#{reason} " \
      "#{e.class}: #{e.message}"
    )
  end
end