#!/usr/bin/perl -w
use strict;
use Benchmark qw(cmpthese);

my ($points, $quota) = (1000, 20);

cmpthese(
   -1,
   {
      'op_orig'   => sub { return op_orig($points, $quota);},
      'op_cmp2'   => sub { return op_cmp2($points, $quota);},
      'davidrw_1' => sub { return davidrw_1($points, $quota);},
      'davidrw_2' => sub { return davidrw_2($points, $quota);},
      'ternary'   => sub { return ternary_cmp($points, $quota);},
   }
   );

sub op_orig {
   # OP, original compare
   my ($points, $quota) = @_;
   if ($points > 18000 && $quota < 24) {
      return 24;
   } elsif ($points > 16000 && $quota < 23) {
      return 23;
   } elsif ($points > 14000 && $quota < 22) {
      return 22;
   } elsif ($points > 12000 && $quota < 21) {
      return 21;
   } elsif ($points > 10000 && $quota < 20) {
      return 20;
   } elsif ($points > 8000 && $quota < 19) {
      return 19;
   } elsif ($points > 6000 && $quota < 18) {
      return 18;
   } elsif ($points > 4000 && $quota < 17) {    #19
      return 17;
   } elsif ($points > 2000 && $quota < 16) {    #17
      return 16;
   }
   return 15;
}

sub op_cmp2 {
   # OP, compare2
   my ($points, $quota) = @_;
   my $base_quota = 15;
   while($points > 2000 && $quota > $base_quota) {
      $points -= 2000;
      $base_quota += 1;
   }
   return $base_quota;
}

sub davidrw_1 {
   # davidrw suggestion 1
   my ($points, $quota) = @_;
   my @comparisons = (
      # points, quota
      [18000, 24],
      [16000, 23],
      [14000, 22],
      [12000, 21],
      [10000, 20],
      [8000,  19],
      [6000,  18],
      [4000,  17],
      [2000,  16],
      );
   foreach my $cmp (@comparisons) {
      return $cmp->[1] if $points > $cmp->[0] && $quota < $cmp->[1];
   }
   return 15;
}

sub davidrw_2 {
   # davidrw suggestion 2
   my ($points, $quota) = @_;
   my @comparisons = map { [($_ - 15) * 2000, $_] } 24 .. 16;
   foreach my $cmp (@comparisons) {
      return $cmp->[1] if $points > $cmp->[0] && $quota < $cmp->[1];
   }
   return 15;
}

sub ternary_cmp {
   # Just for the fun of it
   my ($points, $quota) = @_;
   return ($points > 18000 && $quota < 24) ? 24
        : ($points > 16000 && $quota < 23) ? 23
        : ($points > 14000 && $quota < 22) ? 22
        : ($points > 12000 && $quota < 21) ? 21
        : ($points > 10000 && $quota < 20) ? 20
        : ($points >  8000 && $quota < 19) ? 19
        : ($points >  6000 && $quota < 18) ? 18
        : ($points >  4000 && $quota < 17) ? 17
        : ($points >  2000 && $quota < 16) ? 16
        : 15;
}

__END__