class DataUpdateScript < ApplicationRecord
  DIRECTORY = Rails.root.join("lib/data_update_scripts").freeze
  NAMESPACE = "DataUpdateScripts".freeze
  STATUSES = { enqueued: 0, working: 1, succeeded: 2, failed: 3 }.freeze

  default_scope { order(file_name: :asc) }

  enum status: STATUSES
  validates :file_name, uniqueness: true

  def self.filenames
    Dir.glob("*.rb", base: DIRECTORY).map do |f|
      Pathname.new(f).basename(".rb").to_s
    end
  end

  def self.load_script_ids
    filenames.
      map { |file_name| find_or_create_by(file_name: file_name) }.
      select(&:enqueued?).
      map(&:id)
  end

  def mark_as_run!
    update!(run_at: Time.current, status: :working)
  end

  def mark_as_finished!
    update!(finished_at: Time.current, status: :succeeded)
  end

  def mark_as_failed!
    update!(finished_at: Time.current, status: :failed)
  end

  def file_path
    "#{self.class::DIRECTORY}/#{file_name}.rb"
  end

  def file_class
    "#{self.class::NAMESPACE}::#{parsed_file_name.camelcase}".safe_constantize
  end

  private

  def parsed_file_name
    file_name.match(/\d{14}_(.*)/)[1]
  end
end