class SidekiqScheduler::Scheduler

def active_job_enqueue?(klass)
  klass.is_a?(Class) && defined?(ActiveJob::Enqueuing) &&
    klass.included_modules.include?(ActiveJob::Enqueuing)
end

def arguments_with_metadata(args, metadata)
  if args.is_a? Array
    [*args, metadata]
  else
    [args, metadata]
  end
end

def clear_schedule!(stop_option = :wait)
  rufus_scheduler.stop(stop_option)
  @rufus_scheduler = nil
  @@scheduled_jobs = {}
  rufus_scheduler
end

def enabled_queue?(job_queue, queues)
  queues.empty? || queues.include?(job_queue)
end

def enqueue_job(job_config, time=Time.now)
  config = prepare_arguments(job_config.dup)
  if config.delete('include_metadata')
    config['args'] = arguments_with_metadata(config['args'], scheduled_at: time.to_f)
  end
  if active_job_enqueue?(config['class'])
    enqueue_with_active_job(config)
  else
    enqueue_with_sidekiq(config)
  end
end

def enqueue_with_active_job(config)
  options = {
    queue: config['queue']
  }.keep_if { |_, v| !v.nil? }
  initialize_active_job(config['class'], config['args']).enqueue(options)
end

def enqueue_with_sidekiq(config)
  Sidekiq::Client.push(sanitize_job_config(config))
end

def handle_errors
  begin
    yield
  rescue StandardError => e
    logger.info "#{e.class.name}: #{e.message}"
  end
end

def idempotent_job_enqueue(job_name, time, config)
  registered = register_job_instance(job_name, time)
  if registered
    logger.info "queueing #{config['class']} (#{job_name})"
    handle_errors { enqueue_job(config, time) }
    remove_elder_job_instances(job_name)
  else
    logger.debug { "Ignoring #{job_name} job as it has been already enqueued" }
  end
end

def initialize_active_job(klass, args)
  if args.is_a?(Array)
    klass.new(*args)
  else
    klass.new(args)
  end
end

def job_enabled?(name)
  job = Sidekiq.schedule[name]
  schedule_state(name).fetch('enabled', job.fetch('enabled', true)) if job
end

def load_schedule!
  if enabled
    logger.info 'Loading Schedule'
    # Load schedule from redis for the first time if dynamic
    if dynamic
      Sidekiq.reload_schedule!
      @current_changed_score = Time.now.to_f
      rufus_scheduler.every(dynamic_every) do
        update_schedule
      end
    end
    logger.info 'Schedule empty! Set Sidekiq.schedule' if Sidekiq.schedule.empty?
    @@scheduled_jobs = {}
    queues = sidekiq_queues
    Sidekiq.schedule.each do |name, config|
      if !listened_queues_only || enabled_queue?(config['queue'].to_s, queues)
        load_schedule_job(name, config)
      else
        logger.info { "Ignoring #{name}, job's queue is not enabled." }
      end
    end
    logger.info 'Schedules Loaded'
  else
    logger.info 'SidekiqScheduler is disabled'
  end
end

def load_schedule_job(name, config)
  # If rails_env is set in the config, enforce ENV['RAILS_ENV'] as
  # required for the jobs to be scheduled.  If rails_env is missing, the
  # job should be scheduled regardless of what ENV['RAILS_ENV'] is set
  # to.
  if config['rails_env'].nil? || rails_env_matches?(config)
    logger.info "Scheduling #{name} #{config}"
    interval_defined = false
    interval_types = %w{cron every at in interval}
    interval_types.each do |interval_type|
      config_interval_type = config[interval_type]
      if !config_interval_type.nil? && config_interval_type.length > 0
        schedule, options = SidekiqScheduler::RufusUtils.normalize_schedule_options(config_interval_type)
        rufus_job = new_job(name, interval_type, config, schedule, options)
        @@scheduled_jobs[name] = rufus_job
        update_job_next_time(name, rufus_job.next_time)
        interval_defined = true
        break
      end
    end
    unless interval_defined
      logger.info "no #{interval_types.join(' / ')} found for #{config['class']} (#{name}) - skipping"
    end
  end
end

def new_job(name, interval_type, config, schedule, options)
  options = options.merge({ :job => true, :tags => [name] })
  rufus_scheduler.send(interval_type, schedule, options) do |job, time|
    idempotent_job_enqueue(name, time, sanitize_job_config(config)) if job_enabled?(name)
  end
end

def new_rufus_scheduler
  Rufus::Scheduler.new(rufus_scheduler_options).tap do |scheduler|
    scheduler.define_singleton_method(:on_post_trigger) do |job, triggered_time|
      SidekiqScheduler::Scheduler.update_job_last_time(job.tags[0], triggered_time)
      SidekiqScheduler::Scheduler.update_job_next_time(job.tags[0], job.next_time)
    end
  end
end

def prepare_arguments(config)
  config['class'] = try_to_constantize(config['class'])
  if config['args'].is_a?(Hash)
    config['args'].symbolize_keys! if config['args'].respond_to?(:symbolize_keys!)
  else
    config['args'] = Array(config['args'])
  end
  config
end

def print_schedule
  if rufus_scheduler
    logger.info "Scheduling Info\tLast Run"
    scheduler_jobs = rufus_scheduler.all_jobs
    scheduler_jobs.each_value do |v|
      logger.info "#{v.t}\t#{v.last}\t"
    end
  end
end

def rails_env_matches?(config)
  config['rails_env'] && ENV['RAILS_ENV'] && config['rails_env'].gsub(/\s/, '').split(',').include?(ENV['RAILS_ENV'])
end

def register_job_instance(job_name, time)
  SidekiqScheduler::RedisManager.register_job_instance(job_name, time)
end

def reload_schedule!
  if enabled
    logger.info 'Reloading Schedule'
    clear_schedule!
    load_schedule!
  else
    logger.info 'SidekiqScheduler is disabled'
  end
end

def remove_elder_job_instances(job_name)
  SidekiqScheduler::RedisManager.remove_elder_job_instances(job_name)
end

def rufus_scheduler
  @rufus_scheduler ||= new_rufus_scheduler
end

def rufus_scheduler_options
  @rufus_scheduler_options ||= {}
end

def rufus_scheduler_options=(options)
  @rufus_scheduler_options = options
end

def sanitize_job_config(config)
  config.reject { |k, _| RUFUS_METADATA_KEYS.include?(k) }
end

def schedule_state(name)
  state = SidekiqScheduler::RedisManager.get_job_state(name)
  state ? JSON.parse(state) : {}
end

def scheduled_jobs
  @@scheduled_jobs
end

def set_schedule_state(name, state)
  SidekiqScheduler::RedisManager.set_job_state(name, state)
end

def sidekiq_queues
  Sidekiq.options[:queues].map(&:to_s)
end

def toggle_job_enabled(name)
  state = schedule_state(name)
  state['enabled'] = !job_enabled?(name)
  set_schedule_state(name, state)
end

def try_to_constantize(klass)
  klass.is_a?(String) ? klass.constantize : klass
rescue NameError
  klass
end

def unschedule_job(name)
  if scheduled_jobs[name]
    logger.debug "Removing schedule #{name}"
    scheduled_jobs[name].unschedule
    scheduled_jobs.delete(name)
  end
end

def update_job_last_time(name, last_time)
  SidekiqScheduler::RedisManager.set_job_last_time(name, last_time) if last_time
end

def update_job_next_time(name, next_time)
  if next_time
    SidekiqScheduler::RedisManager.set_job_next_time(name, next_time)
  else
    SidekiqScheduler::RedisManager.remove_job_next_time(name)
  end
end

def update_schedule
  last_changed_score, @current_changed_score = @current_changed_score, Time.now.to_f
  schedule_changes = SidekiqScheduler::RedisManager.get_schedule_changes(last_changed_score, @current_changed_score)
  if schedule_changes.size > 0
    logger.info 'Updating schedule'
    Sidekiq.reload_schedule!
    schedule_changes.each do |schedule_name|
      if Sidekiq.schedule.keys.include?(schedule_name)
        unschedule_job(schedule_name)
        load_schedule_job(schedule_name, Sidekiq.schedule[schedule_name])
      else
        unschedule_job(schedule_name)
      end
    end
    logger.info 'Schedule updated'
  end
end