secret-santa-script.rb

require 'mail'

=begin
Put participants in file INPUT_FILE in a format:

participant_name:participant_email

selection will be backed up in BACKUP_FILE.
=end

INPUT_FILE = "participants.txt"
BACKUP_FILE = "lottery.txt"

Mail.defaults do
  delivery_method :smtp, { :address              => "",
                           :port                 => 587,
                           :domain               => '',
                           :user_name            => '',
                           :password             => '',
                           :authentication       => '',
                           :enable_starttls_auto => true  }
end

participants = File.read(INPUT_FILE).lines.
               to_a.map(&:strip).reject(&:empty?).map { |i| i.split(':') }

pairs = {}
participants.shuffle!
participants.length.times do |i|
  pairs[participants[i-1][0]] = participants[i][1]
end

backup = File.open(BACKUP_FILE, "w+")
pairs.each do |p1, p2|
  backup.puts "#{p2}:#{p1}"
end
backup.close

pairs.each do |p1, p2|
  puts "delivering message to #{p2}..."

  message = Mail.new do
    to p2
    from ""
    subject "Secret Santa event"
    body """Hi,

We are happy to inform you have been selected as Secret Santa for #{p1}.

Regards,
Secret Santa inc.
"""
  end

  message.deliver!

  puts "message delivered"
end