#!/opt/bin/perl

# Usage: bench json-file

use JSON;
use JSON::DWIW;
use JSON::PC;
use JSON::XS;
use JSON::Syck;

use Time::HiRes;
use List::Util;

use utf8;

my $dwiw = new JSON::DWIW;
my $pc   = new JSON::PC;
my $xs   = JSON::XS->new->pretty->canonical->shrink;

my $json; # the test string

local $/;
$json = <>;

srand 0; $json = JSON::XS->new->utf8(1)->ascii(0)->encode ([join "", map +(chr rand 2555), 0..2047]);

#if (1) {
#   use Storable;
#   open my $fh, "<:unix", "/opt/crossfire/share/cfserver/faces" or die "$!";
#   my $faces = Storable::thaw do { <$fh> };
#   $json = objToJson $faces;
#   open my $fh2, ">:unix", "faces.json" or die "$!";
#   print $fh2 $json;
#   warn length $json;
#}

my %tst = (
#   "JSON"         => ['objToJson $perl'       , 'jsonToObj $json'],
#   "JSON::DWIW"   => ['$dwiw->to_json ($perl)', '$dwiw->from_json ($json)'],
#   "JSON::PC"     => ['$pc->convert ($perl)'  , '$pc->parse ($json)'],
#   "JSON::Syck"   => ['JSON::Syck::Dump $perl', 'JSON::Syck::Load $json'],
   "JSON::XS"     => ['to_json $perl'         , 'from_json $json'],
   "JSON::XS/2"   => ['$xs->encode ($perl)'   , '$xs->decode ($json)'],
);

sub bench($) {
   my ($code) = @_;

   my $perl = jsonToObj $json;
   my $count = 20;
   my $times = 25;

   my $cent = eval "sub { " . (join ";", ($code) x $count) . "}";
   $cent->();

   my @meas;

   while () {
      push @meas, Time::HiRes::time;
      $cent->();
      $meas[-1] = Time::HiRes::time - $meas[-1];

      my $mean = (List::Util::sum @meas) / @meas;
      if (@meas >= $times) {
         @meas = grep $_ > $mean * 0.9 && $_ < $mean * 1.1, @meas;
         my @meas = grep $_ > $mean * 0.9999 && $_ < $mean * 1.1111, @meas;
         if (@meas >= $times) {
            return $count / $mean;
         }
      }
   }
}

printf "%-10s | %10s | %10s |\n", "module", "encode", "decode";
printf "-----------|------------|------------|\n";
for my $module (sort keys %tst) {
   my $enc = bench $tst{$module}[0];
   my $dec = bench $tst{$module}[1];

   printf "%-10s | %10.3f | %10.3f |\n", $module, $enc, $dec;
}
printf "-----------+------------+------------+\n";