KalleLindstrom

require 'optparse'

SECOND_MS = 1000
MINUTE_MS = 60000
HOUR_MS = 3600000

def to_ms(h, m, s, ms)
 ms + (s * SECOND_MS) + (m * MINUTE_MS) + (h * HOUR_MS)
end

def format_result(ms)
  h = ms / HOUR_MS
  ms -= h * HOUR_MS
  h = h.to_s
  
  m = ms / MINUTE_MS
  ms -= m * MINUTE_MS
  m = m.to_s
  
  s = ms / SECOND_MS
  ms -= s * SECOND_MS
  s = s.to_s
  
  ms = ms.to_s
  
  h = "0#{h}" if h.length == 1
  m = "0#{m}" if m.length == 1
  s = "0#{s}" if s.length == 1
  if ms.length == 1
    ms = "00#{ms}"
  elsif ms.length == 2
    ms = "0#{ms}"
  end
  
  "#{h}:#{m}:#{s},#{ms}"
end

def change_time(time, h, m, s, ms)
  time =~ /(\d{2}):(\d{2}):(\d{2}),(\d+)/
  total_ms = to_ms($1.to_i, $2.to_i, $3.to_i, $4.to_i) + to_ms(h, m, s, ms)
  format_result(total_ms)
end

def write_time(input_file, output_file, h, m, s, ms)
  File.open(input_file, "r") do |file|
    @file_string = file.readlines.join
    @file_string.gsub!(/\d{2}:\d{2}:\d{2},\d+/) {|time| change_time(time, h, m, s, ms)}
  end
  File.open(output_file, "w") do |file|
    file.write(@file_string)
  end
end

options = {}
option_parser = OptionParser.new do |opts|
  options[:operation] = nil 
  opts.on("--operation OPERATION") {|value| options[:operation] = value}
  
  options[:time] = nil
  opts.on('--time TIME') {|value| options[:time] = value}
end
option_parser.parse!

options[:time] =~ /(\d+),(\d+)/
s = $1.to_i
ms = $2.to_i
if options[:operation] == "sub"
    s *= -1
    ms *= -1
end

input_file = ARGV[0]
output_file = ARGV[1]
  
write_time(input_file, output_file, 0, 0, s, ms)