#!/usr/bin/env ruby
require 'gdbm'
require 'time'
require 'syslog'

ILOGF = '/nwp/p0/incomplete/obsbf-log.db'
LLOGF = '/nwp/p0/latest/obsbf-log.db'

now = Time.now.utc

logf = if File.exist?(ILOGF) then ILOGF
       elsif File.exist?(LLOGF) then LLOGF
       else
          STDERR.puts("missing #{ILOGF} and #{LLOGF}")
          puts "535"
          exit 0
       end

begin
  maxval='1970-01-01T000000Z'

  GDBM::open(logf) {|db|
    db.each{|k,v|
      next unless /^\d\d\d\d-\d\d-\d\dT/ === v
      maxval=v if v>maxval
    }
  }
  maxval="#{$1}:#{$2}:#{$3}" if /^(\d\d\d\d-\d\d-\d\dT\d\d)(\d\d)(\d\dZ)/ === maxval
  diff = now - Time.parse(maxval)
rescue ArgumentError
  STDERR.puts("malformatted time #{maxval}")
  puts "535"
  exit 0
rescue Errno::EAGAIN
  mtime = File.mtime(logf).utc
  diff = now - mtime
  Syslog.open('wis-browse', Syslog::LOG_PID, Syslog::LOG_NEWS) do |log|
    log.warning(format("GDBM busy, mtime %s used", mtime.to_s))
  end
end

if diff > 300 then
  Syslog.open('wis-browse', Syslog::LOG_PID, Syslog::LOG_NEWS) do |log|
    log.info(format("%.1fs from last bulletin %s", diff, maxval))
  end
end

# 出力
printf "%6.3f\n", diff