demarches-normaliennes/app/models/archive.rb

# == Schema Information
#
# Table name: archives
#
#  id             :bigint           not null, primary key
#  key            :text             not null
#  month          :date
#  status         :string           not null
#  time_span_type :string           not null
#  created_at     :datetime         not null
#  updated_at     :datetime         not null
#
class Archive < ApplicationRecord
  include AASM

  RETENTION_DURATION = 4.days
  MAX_SIZE = 100.gigabytes

  has_and_belongs_to_many :groupe_instructeurs

  has_one_attached :file

  scope :stale, -> { where('updated_at < ?', (Time.zone.now - RETENTION_DURATION)) }
  scope :for_groupe_instructeur, -> (groupe_instructeur) {
    joins(:archives_groupe_instructeurs)
      .where(
        archives_groupe_instructeurs: { groupe_instructeur: groupe_instructeur }
      )
  }

  enum time_span_type: {
    everything: 'everything',
    monthly:    'monthly'
  }

  enum status: {
    pending: 'pending',
    generated: 'generated',
    failed: 'failed'
  }

  aasm whiny_persistence: true, column: :status, enum: true do
    state :pending, initial: true
    state :generated
    state :failed

    event :make_available do
      transitions from: :pending, to: :generated
    end
    event :restart do
      transitions from: :failed, to: :pending
    end
    event :fail do
      transitions from: :pending, to: :failed
    end
  end

  def available?
    status == 'generated' && file.attached?
  end

  def filename(procedure)
    if time_span_type == 'everything'
      "procedure-#{procedure.id}.zip"
    else
      "procedure-#{procedure.id}-mois-#{I18n.l(month, format: '%Y-%m')}.zip"
    end
  end

  def self.find_or_create_archive(time_span_type, month, groupe_instructeurs)
    create_with(groupe_instructeurs: groupe_instructeurs)
      .create_or_find_by(time_span_type: time_span_type, month: month, key: generate_cache_key(groupe_instructeurs))
  end

  private

  def self.generate_cache_key(groupe_instructeurs)
    groupe_instructeurs.map(&:id).sort.join('-')
  end
end