#!/usr/bin/env ruby

# This process is used to maintain Huginn's upkeep behavior, automatically running scheduled Agents and
# periodically propagating and expiring Events.  It's typically run via foreman and the included Procfile.

unless defined?(Rails)
  puts
  puts "Please run me with rails runner, for example:"
  puts "  RAILS_ENV=production bundle exec rails runner bin/schedule.rb"
  puts
  exit 1
end

require 'rufus/scheduler'

class HuginnScheduler
  attr_accessor :mutex

  def run_schedule(time)
    with_mutex do
      puts "Queuing schedule for #{time}"
      Agent.delay.run_schedule(time)
    end
  end

  def propagate!
    with_mutex do
      puts "Queuing event propagation"
      Agent.delay.receive!
    end
  end

  def cleanup_expired_events!
    with_mutex do
      puts "Running event cleanup"
      Event.delay.cleanup_expired!
    end
  end

  def with_mutex
    ActiveRecord::Base.connection_pool.with_connection do
      mutex.synchronize do
        yield
      end
    end
  end

  def run!
    self.mutex = Mutex.new

    rufus_scheduler = Rufus::Scheduler.new

    tzinfo_friendly_timezone = ActiveSupport::TimeZone::MAPPING[ENV['TIMEZONE'].present? ? ENV['TIMEZONE'] : "Pacific Time (US & Canada)"]

    # Schedule event propagation.

    rufus_scheduler.every '1m' do
      propagate!
    end

    # Schedule event cleanup.

    rufus_scheduler.cron "0 0 * * * " + tzinfo_friendly_timezone do
      cleanup_expired_events!
    end

    # Schedule repeating events.

    %w[1m 2m 5m 10m 30m 1h 2h 5h 12h 1d 2d 7d].each do |schedule|
      rufus_scheduler.every schedule do
        run_schedule "every_#{schedule}"
      end
    end

    # Schedule events for specific times.

    # Times are assumed to be in PST for now.  Can store a user#timezone later.
    24.times do |hour|
      rufus_scheduler.cron "0 #{hour} * * * " + tzinfo_friendly_timezone do
        if hour == 0
          run_schedule "midnight"
        elsif hour < 12
          run_schedule "#{hour}am"
        elsif hour == 12
          run_schedule "noon"
        else
          run_schedule "#{hour - 12}pm"
        end
      end
    end

    rufus_scheduler.join
  end
end

scheduler = HuginnScheduler.new
scheduler.run!