#!/usr/bin/ruby
 
dst="#{ENV['HOME']}/Documents/tmobile"
 
# 1. pull together all pgp crypted find Rechnung_15.10.2009.zip.pgp in Desktop, Downloads, local dir
["#{ENV['HOME']}/Downloads", "#{ENV['HOME']}/Desktop", dst].each do |dir|
  Dir.foreach(dir) do |file|
    m = /Rechnung_(\d{2})\.(\d{2})\.(\d{4})\.zip(\.pgp|\.gpg)?/.match file
    if m
      s = system "mv #{dir}/#{file} #{dst}/#{m[3]}-#{m[2]}-#{m[1]}-bill.zip#{m[4]}"
      s = system "gpg #{dst}/#{m[3]}-#{m[2]}-#{m[1]}-bill.zip#{m[4]}" if m[4]
      system "rm #{dst}/#{m[3]}-#{m[2]}-#{m[1]}-bill.zip#{m[4]}" if s && m[4]
      s = system "unzip #{dst}/#{m[3]}-#{m[2]}-#{m[1]}-bill.zip"
      system "rm #{dst}/#{m[3]}-#{m[2]}-#{m[1]}-bill.zip" if s
      puts "de-crypted & unpacked #{dst}/#{m[3]}-#{m[2]}-#{m[1]}-bill.zip"
    end
  end
end
 
# 2. rename unpacked files accordingly
Dir.foreach(dst) do |file|
  m = /^Rechnung_(\d{4})_(\d{2})_(.+)$/.match file
  system "mv #{dst}/#{file} #{dst}/#{m[1]}-#{m[2]}-bill-#{m[3]}" if m
  m = /^Einzelverbindungsnachweis_(\d{4})_(\d{2})_(.+)$/.match file
  system "mv #{dst}/#{file} #{dst}/#{m[1]}-#{m[2]}-evn--#{m[3]}" if m
  m = /^Rechnung_(\d{5,20})_(\d{2})_(\d{4})(.+)$/.match file
  system "mv #{dst}/#{file} #{dst}/#{m[3]}-#{m[2]}-bill-#{m[1]}#{m[4]}" if m
  m = /^Einzelverbindungsnachweis_(\d{5,20})_(\d{2})_(\d{4})(.+)$/.match file
  system "mv #{dst}/#{file} #{dst}/#{m[3]}-#{m[2]}-evn--#{m[1]}#{m[4]}" if m
end