#!/usr/bin/perl
use strict;
use warnings;

# This program reads log data from bears.txt and searches for instances of "You say, '***'". Each 
# such instance is treated as the loot for a particular bear (empty loot is just "You say, ''").
# The program then outputs a list of everything bears dropped with the probability of dropping
# each thing, as well as the number of total bears killed. Note: the output file is cleared and 
# replaced each time the program is run.

open INPUT, "bears.txt" or die $!;
open OUTPUT, ">out.txt" or die $!;

my $num_bears = 0;

my $curr_line;
my $curr_loots;
my $done_with_curr_loot;

# Key is the name of a loot piece; value is the number of times that piece was looted.
my (%loot_count);

while (<INPUT>) 
{
   $curr_line = $_;
   if ($curr_line =~ /You say, '(.*)'/)
   {
      $num_bears++;
      $curr_loots = $1;
      $done_with_curr_loot = "FALSE";
      while ($done_with_curr_loot eq "FALSE")
      {
         if ($curr_loots =~ /^(.*?), (.*)/)
         {
            if (exists($loot_count{$1}))
            {
               $loot_count{$1}++;
            }
            else
            {
               $loot_count{$1} = 1;
            }
            $curr_loots = $2;
         }
         else
         {
            unless ($curr_loots eq "")
            {
               if (exists($loot_count{$curr_loots}))
               {
                  $loot_count{$curr_loots}++;
               }
               else
               {
                  $loot_count{$curr_loots} = 1;
               }
            }
            $done_with_curr_loot = "TRUE";
         }
      }
   }
}

print OUTPUT "Number of bears: $num_bears\.\n";
for (keys %loot_count)
{
   print OUTPUT "$_ ";
   print OUTPUT $loot_count{$_} / $num_bears;
   print OUTPUT "\n";
}