require_relative 'students_list_base'
require_relative 'student'

class StudentsListTXT < StudentsListBase
  def load_from_file
    if File.exist?(@filename)
      File.open(@filename, 'r') do |file|
        @students = file.each_line.map do |line|
          line.strip!
          next if line.empty?
          begin
            Student.from_string(line)
          rescue ArgumentError => e
            warn "Ошибка при парсинге строки: #{line}. #{e.message}"
            nil
          end
        end.compact
      end
    else
      @students = []
    end
    self
  end

  def save_to_file
    File.open(@filename, 'w') do |file|
      @students.each do |student|
        file.puts student.to_s
      end
    end
    self
  end
end