# @summary Updates the list of available packages using apt-get update.
#
# @api private
#
class apt::update {
  assert_private()

  #TODO: to catch if apt_update_last_success has the value of -1 here. If we
  #opt to do this, a info/warn would likely be all you'd need likely to happen
  #on the first run, but if it's not run in awhile something is likely borked
  #with apt and we'd want to know about it.

  case $apt::_update['frequency'] {
    'always': {
      $_kick_apt = true
    }
    Integer[60]:{
      #compare current date with the apt_update_last_success fact to determine
      #if we should kick apt_update.
      $int_threshold = (Integer(Timestamp().strftime('%s')) - Integer($apt::_update['frequency']))
      if $facts['apt_update_last_success'] {
        if $facts['apt_update_last_success'] + 0 < $int_threshold {
          $_kick_apt = true
        } else {
          $_kick_apt = false
        }
      } else {
        #if apt-get update has not successfully run, we should kick apt_update
        $_kick_apt = true
      }
    }
    'hourly':{
      #compare current date with the apt_update_last_success fact to determine
      #if we should kick apt_update.
      $hourly_threshold = (Integer(Timestamp().strftime('%s')) - 3600)
      if $facts['apt_update_last_success'] {
        if $facts['apt_update_last_success'] + 0 < $hourly_threshold {
          $_kick_apt = true
        } else {
          $_kick_apt = false
        }
      } else {
        #if apt-get update has not successfully run, we should kick apt_update
        $_kick_apt = true
      }
    }
    'daily': {
      #compare current date with the apt_update_last_success fact to determine
      #if we should kick apt_update.
      $daily_threshold = (Integer(Timestamp().strftime('%s')) - 86400)
      if $facts['apt_update_last_success'] {
        if $facts['apt_update_last_success'] + 0 < $daily_threshold {
          $_kick_apt = true
        } else {
          $_kick_apt = false
        }
      } else {
        #if apt-get update has not successfully run, we should kick apt_update
        $_kick_apt = true
      }
    }
    'weekly':{
      #compare current date with the apt_update_last_success fact to determine
      #if we should kick apt_update.
      $weekly_threshold = (Integer(Timestamp().strftime('%s')) - 604800)
      if $facts['apt_update_last_success'] {
        if $facts['apt_update_last_success'] + 0 < $weekly_threshold {
          $_kick_apt = true
        } else {
          $_kick_apt = false
        }
      } else {
        #if apt-get update has not successfully run, we should kick apt_update
        $_kick_apt = true
      }
    }
    default: {
      #catches 'reluctantly', and any other value (which should not occur).
      #do nothing.
      $_kick_apt = false
    }
  }

  if $_kick_apt {
    $_refresh = false
  } else {
    $_refresh = true
  }
  exec { 'apt_update':
    command     => "${apt::provider} update",
    loglevel    => $apt::_update['loglevel'],
    logoutput   => 'on_failure',
    refreshonly => $_refresh,
    timeout     => $apt::_update['timeout'],
    tries       => $apt::_update['tries'],
    try_sleep   => 1,
  }
}