class Akenori

  class << self

    def encode(file_to_encode)
      i = 0
      File.readlines(file_to_encode).each do |line|
        ar = (line.gsub("\n",'').gsub(" ",'').split("\t")).drop(1)
        if !ar[0].nil?
          ar[0] = ar[0].to_i
          ar[1] = ar[1].to_i
          ar[2] = ar[2].to_i
          ar[3] = (ar[3].to_f * 100000).to_i
          ar[4] = (ar[4].to_f * 100000).to_i
          contents = IO.binwrite("#{file_to_encode.gsub(".txt",'.bin')}",ar.pack("LLLLL"),i+20)
          i += 20
        end
      end
    end

    def decode(file_to_decode)
      rec = []
      f = File.open("#{file_to_decode.gsub(".bin",'.txt')}", "w+")
      float_point = 100000
      length = File.stat("#{file_to_decode}").size?.to_i - 20
      i = 0
      while i < length  do
        contents = IO.binread("#{file_to_decode}",i,i+20)
        if i != 0
          decoded_string = [contents.unpack("LLLLL")[0],"\t",contents.unpack("LLLLL")[1],"\t",contents.unpack("LLLLL")[2],"\t",'%.5f' % (contents.unpack("LLLLL")[3].to_f/float_point),"\t",'%.5f' % (contents.unpack("LLLLL")[4].to_f/float_point),"\n"]
          ( rec << contents.unpack("LLLLL") && f << (decoded_string*",").gsub(",",'') ) if !contents.nil?
        end
        i += 20
      end
      f.close
      return rec
    end

  end

end

unless ARGV.empty?
  if ARGV[0] == '-d'
    p "Decode #{ARGV[1]}"
    Akenori.decode(ARGV[1])
  elsif ARGV[0] == '-e'
    p "Encode #{ARGV[1]}"
    Akenori.encode(ARGV[1])
  end
else
  p "No arguments given. Use -d filename to decode or -e filename to encode"
  p "Example: ruby akenori.rb -d SjSDU.bin"
end