class Champs::PieceJustificativeChamp < Champ
  after_commit :create_virus_scan

  PIECE_JUSTIFICATIVE_FILE_MAX_SIZE = 200.megabytes

  PIECE_JUSTIFICATIVE_FILE_ACCEPTED_FORMATS = [
    "application/pdf",
    "application/msword",
    "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    "application/vnd.ms-excel",
    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    "application/vnd.ms-powerpoint",
    "application/vnd.openxmlformats-officedocument.presentationml.presentation",
    "application/vnd.oasis.opendocument.text",
    "application/vnd.oasis.opendocument.presentation",
    "application/vnd.oasis.opendocument.spreadsheet",
    "image/png",
    "image/jpeg"
  ]

  def mandatory_and_blank?
    mandatory? && !piece_justificative_file.attached?
  end

  def piece_justificative_file_errors
    errors = []

    if piece_justificative_file.attached? && piece_justificative_file.previous_changes.present?
      if piece_justificative_file.blob.byte_size > PIECE_JUSTIFICATIVE_FILE_MAX_SIZE
        errors << "Le fichier #{piece_justificative_file.filename.to_s} est trop lourd, il doit faire au plus #{PIECE_JUSTIFICATIVE_FILE_MAX_SIZE.to_s(:human_size, precision: 2)}"
      end

      if !piece_justificative_file.blob.content_type.in?(PIECE_JUSTIFICATIVE_FILE_ACCEPTED_FORMATS)
        errors << "Le fichier #{piece_justificative_file.filename.to_s} est dans un format que nous n'acceptons pas"
      end

      # FIXME: add Clamav check
    end

    if errors.present?
      piece_justificative_file.purge
    end

    errors
  end

  private

  def create_virus_scan
    if self.piece_justificative_file&.attachment&.blob.present?
      VirusScan.where(champ: self).where.not(blob_key: self.piece_justificative_file.blob.key).delete_all
      VirusScan.find_or_create_by!(champ: self, blob_key: self.piece_justificative_file.blob.key) do |virus_scan|
        virus_scan.status = "pending"
      end
    end
  end
end