# == Schema Information
#
# Table name: csv_imports
#
#  id         :integer          not null, primary key
#  separator  :integer          not null
#  created_at :datetime         not null
#  updated_at :datetime         not null
#
class CsvImport < ApplicationRecord
  enum :separator, { comma: ",", semicolon: ";" }, default: :comma

  has_one_attached :file

  validates :file, presence: true
  validate :acceptable_csv, on: :create

  def acceptable_csv
    return unless file.attached?

    if file.blob.byte_size > 20
      errors.add(:file, "this csv file is too large, it must be under 20MB")
      return
    end

    if file.content_type != "text/csv"
      errors.add(:file, :not_a_csv_file)
      return
    end

    begin
      csv = CSV.read(attachment_changes["file"].attachable.path, col_sep: separator)

      logger = Logger.new(STDOUT)
      logger.info(csv)
      errors.add(:file, :empty) if csv.count < 1 || (csv.count == 1 && csv[0].count == 1 && csv[0][0] == "")
    rescue CSV::MalformedCSVError => e
      errors.add(:file, e.message)
    end
  end

  def options_for_separator
    keys = self.class.separators.keys
    keys.map(&:humanize).zip(keys).to_h
  end
end