You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fixed_assets_exchanger.rb
    path of file: ./repos/ekylibre/app/exchangers/isagri/isacompta
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Isagri
  module Isacompta
    class FixedAssetsExchanger < ActiveExchanger::Base
      category :accountancy
      vendor :isagri

      # Check fixed assets
      def check
        valid = true
        source = File.read(file)
        detection = CharlockHolmes::EncodingDetector.detect(source)
        rows = CSV.read(file, headers: true, col_sep: ';', encoding: detection[:encoding])
        w.count = rows.size

        # status to map
        depreciation_method_transcode = {
          'Linéaire' => :linear,
          'Non amortissable' => :none,
          'Dégressif' => :regressive,
          'Dérogatoire' => :regressive
        }

        # get default allocation and expenses account
        exchange_allocation_account = Account.find_o
    
      def import
        source = File.read(file)
        detection = CharlockHolmes::EncodingDetector.detect(source)
        rows = CSV.read(file, headers: true, col_sep: ';', encoding: detection[:encoding])
        w.count = rows.size
        currency_preference = Preference[:currency]

        # status to map
        depreciation_method_transcode = {
          'Linéaire' => :linear,
          'Non amortissable' => :none,
          'Dégressif' => :regressive,
          'Dérogatoire' => :regressive
        }

        rows.each_with_index do |row, index|
          line_number = index + 2
          prompt = "L#{line_number.to_s.yellow} | "

          r = {
            asset_account: row[0].blank? ? nil : row[0].to_s,
            number: row[1].blank? ? '' : row[1].to_s.strip,
            name: row[2].blank? ? nil : row[2].to_s.strip,
            purchase_on: row[4].blank? ? nil : Date.strptime(row[4].to_s, '%d/%m/%Y'),
            purchase_amount: row[5].blank? ? nil : row[5].tr(',', '.').to_d,
            depreciation_method: row[6].blank? ? nil : depreciation_method_transcode[row[6].to_s.strip],
            in_use_on: row[7].blank? ? nil : Date.strptime(row[7].to_s, '%d/%m/%Y'),
            asset_amount: row[8].blank? ? nil : row[8].tr(',', '.').to_d,
            duration_in_year: row[9].blank? ? nil : row[9].to_i,
            depreciation_rate: row[10].blank? ? nil : row[10].tr(',', '.').to_f,
            asset_sale_method: row[11].blank? ? nil : row[11].to_s,
            net_value: row[20].blank? ? nil : row[20].tr(',', '.').to_d,
            product_work_number: row[26].blank? ? nil : row[26].to_s
          }.to_struct

          # get allocation and expenses account
          if r.depreciation_method == :linear || :regressive
            allocation_account_parent_usage = Account.find_parent_usage(self.class.to_allocation_account(r.asset_account))
            allocation_account_default_name = Onoma::Account.find(allocation_account_parent_usage).l
            exchange_allocation_account = Account.find_or_create_by_number(self.class.to_allocation_account(r.asset_account), default_name: allocation_account_default_name)
            exchange_expenses_account = Account.find_or_import_from_nomenclature(:depreciations_inputations_expenses)
          end

          description = r.number + ' | ' + r.name + ' | ' + r.purchase_on.to_s + ' | ' + r.net_value.to_s

          # get or create asset account
          if r.asset_account
            parent_usage = Account.find_parent_usage(r.asset_account)
            default_name = Account.find_by(name: parent_usage) || Onoma::Account.find(parent_usage).l
            exchange_asset_account = Account.find_or_create_by_number(r.asset_account, default_name: default_name)
            w.info prompt + "exchange asset account : #{exchange_asset_account.label.inspect.red}"
          end