--
-- (C) 2013-16 - ntop.org
--

dirs = ntop.getDirs()
package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path

require "lua_utils"

sendHTTPHeader('text/html; charset=iso-8859-1')

interface.select(ifname)
ifstats = aggregateInterfaceStats(interface.getStats())

type = _GET["distr"]

if((type == nil) or (type == "size")) then
   what = ifstats["pktSizeDistribution"]
end

local pkt_distribution = {
   ['upTo64'] = '<= 64',
   ['upTo128'] = '64 <= 128',
   ['upTo256'] = '128 <= 256',
   ['upTo512'] = '256 <= 512',
   ['upTo1024'] = '512 <= 1024',
   ['upTo1518'] = '1024 <= 1518',
   ['upTo2500'] = '1518 <= 2500',
   ['upTo6500'] = '2500 <= 6500',
   ['upTo9000'] = '6500 <= 9000',
   ['above9000'] = '> 9000'
}

tot = 0
for key, value in pairs(what) do
   tot = tot + value
end

threshold = (tot * 5) / 100

print "[\n"
num = 0
sum = 0
for key, value in pairs(what) do
   if(value > threshold) then
      if(num > 0) then
	 print ",\n"
      end
   
      print("\t { \"label\": \"" .. pkt_distribution[key] .."\", \"value\": ".. value .." }") 
      num = num + 1
      sum = sum + value
   end
end

if(sum < tot) then
   print("\t, { \"label\": \"Other\", \"value\": ".. (tot-sum) .." }") 
end

print "\n]"

