#!/bin/bash
declare -a percent
declare -a symbol
declare -i i=0
declare -i sum=0

USAGE="$0 <LENGTH> <SYM0:PERCENT0> <SYM1:PERCENT1> ..."

if [[ $# < 2 ]]; then
  echo "$USAGE"
  exit -1
fi

NUM=$1
shift

ranurl="http://www.random.org/integers/?num=${NUM}&min=1&max=100&col=1&base=10&format=plain&rnd=new"

map=$(
for sd in $@
do
  echo $sd
done | sort -t':' -k 2 -n -r
)

for  sd in $map
do
  percent[$i]=${sd##*:}
  symbol[$i]=${sd%%:*}
#  echo ${i}: ${symbol[$i]} ${percent[$i]}
  (( sum = sum + ${percent[$i]} ))
  ((i++))
done

if (( sum != 100 ))
then
   echo "$USAGE"
   echo "ERROR: distribution does not sum ($sum) to 100"
   exit -1
fi

num=$i

curl -s -q "$ranurl" | while read val
do
   ((t=0))	
   for ((i=0; i<num; i++))
   do
     ((t+=${percent[$i]}))
#      echo $i ${percent[$i]} ${symbol[$i]}
       (($val <= t )) && echo -n ${symbol[$i]} && break
   done
done