#!/bin/sh
# Compute average of integer values in a file

# Check for input parameter
# The input file has lines of integers of the form:
# ID STEPS COST
if [ -z "$1" ]; then echo 'Usage: average.sh (bb|hr|dp)'; exit; fi
if [ "$1" != "bb" -a "$1" != "hr" -a "$1" != "dp" ]
    then echo 'Usage: average.sh (bb|hr|dp)'; exit; 
fi

# -----------------------------------
# Remove old files
if [ -f ${1}.steps ]; then rm ${1}.steps; fi
if [ -f ${1}.costs ]; then rm ${1}.costs; fi

# ********************************** LOOP over all files
for FILE in `echo $1*txt`; do

# ------------------------------------
# 1. READ COLUMNS of the input file

# Get the content of the input file (2nd and 3rd field)
STEPS=`cut -d" "  -f2 -s $FILE`
COSTS=`cut -d" "  -f3 -s $FILE`
COUNT=`wc -l < $FILE`
if [ -z "$STEPS" -o -z "$COSTS" ]; then echo 'Wrong file content'; exit; fi

# -------------------------------------
# 2. SUM steps and costs from the previous step

# Variables
SUM_S=0;
SUM_C=0;

for NR in $STEPS; do SUM_S=`expr $SUM_S + $NR`; done;
for NR in $COSTS; do SUM_C=`expr $SUM_C + $NR`; done;

# -------------------------------------
# 3. Store results
echo "count $COUNT  steps:  $SUM_S  costs:  $SUM_C"
echo `expr $SUM_S / $COUNT` >> ${1}.steps
echo `expr $SUM_C / $COUNT` >> ${1}.costs

# End of "for all files"
done
# ********************************** LOOP-end