#!/bin/bash
#########################################################
#
# Matthew Page
# 11/20/2014
# CSCS 1730
# 
# timeonline -  a script to caclulate number of logins
#               and time online.
#
#########################################################

#establishing user
if [ $# -eq 1 ];then
    userexists=`last | grep $1`
    if [ "$userexists" = "" ];then
        echo "¡NO BUENO! User $1 does not exist!"
        exit 0
    fi
    person=$1
else
    person=$(echo $USER)
fi

echo "Please wait...Processing..."

#variables for number of logins per month
auglogins=`last | grep $person | grep Aug | wc -l`
seplogins=`last | grep $person | grep Sep | wc -l`
octlogins=`last | grep $person | grep Oct | wc -l`
novlogins=`last | grep $person | grep Nov | wc -l`
declogins=`last | grep $person | grep Dec | wc -l`
totallogins=$(echo "($auglogins + $seplogins + $octlogins + $novlogins + $declogins)" | bc -l)

#searching for logins that contain more than a day (denoted by a plus sign) and totaling those days
days=`last | grep $person | grep '+' | cut -d '(' -f2 | cut -d '+' -f1`
totaldays=`echo $days | xargs | sed 's/\ /+/g' | bc -l` 

#searching for logins hours and minutes sections within the subset of logins that have more than a day
#(denoted by a plus sign) and totaling them
hoursfrompluslines=`last | grep $person | cut -d '(' -f2 | grep '+' | cut -d '+' -f2 | cut -d ':' -f1 | xargs | sed 's/\ /+/g' | bc -l`
minutesfrompluslines=`last | grep $person | cut -d '(' -f2 | grep '+' | cut -d '+' -f2 | cut -d ':' -f2 | cut -d ')' -f1 | xargs | sed 's/\ /+/g' | bc -l`

#some users have no plus signs (multiple day logins) so their value of the following three variables was
#an empty srting so i had to check for that then set those empty string variabels to 0's
if [ "$hoursfrompluslines" = "" ];then
    hoursfrompluslines=0
fi

if [ "$minutesfrompluslines" = "" ];then
    minutesfrompluslines=0
fi

if [ "$totaldays" = "" ];then
    totaldays=0
fi

#searching for logins hours and minutes sections outside the subset of logins that have more than a day
#(denoted by a plus sign) and totaling them
hoursfromNONpluslines=`last | grep $person | grep -v '+' | grep -v "still logged in" | grep -v "gone - no logout" | cut -d '(' -f2 | cut -d ':' -f1 | xargs | sed 's/\ /+/g' | bc -l`
minutesfromNONpluslines=`last | grep $person | grep -v '+' | grep -v "still logged in" | grep -v "gone - no logout" | cut -d '(' -f2 | cut -d ':' -f2 | cut -d ')' -f1 | xargs | sed 's/\ /+/g' | bc -l`

#adding up the seperated 2 subsets of hours and minutes to get total hours and total minutes variables,
#however called "unrefined" referring to them not being converted up, (i.e. 123 minutes would be 2 hours
# and 3 minutes ultimately later)
unrefinedhours=$(echo "($hoursfrompluslines+$hoursfromNONpluslines)" | bc -l)
unrefinedminutes=$(echo "($minutesfrompluslines+$minutesfromNONpluslines)" | bc -l)

#loop to convert up minutes to hours after every 60 minutes
totalminutes=0
while [ $unrefinedminutes -ge 60 ];do
    unrefinedminutes=$(echo "($unrefinedminutes-60)" | bc -l)
    unrefinedhours=$(echo "($unrefinedhours+1)" | bc -l)
    totalminutes=$(echo $unrefinedminutes)
done

#loop to convert up hours to days fter every 24 hours
totalhours=0
while [ $unrefinedhours -ge 24 ];do
    unrefinedhours=$(echo "($unrefinedhours-24)" | bc -l)
    totaldays=$(echo "($totaldays+1)" | bc -l)
    totalhours=$(echo $unrefinedhours)
done

#loop to print a star for every 10 logins in august
augtemp=$(echo $auglogins)
augstars=$(echo "")
while [ $augtemp -ge 10 ];do
    augtemp=$(echo "($augtemp-10)" | bc -l)
    augstars=$(echo $augstars+"*")
done

#loop to print a star for every 10 logins in september
septemp=$(echo $seplogins)
sepstars=$(echo "")
while [ $septemp -ge 10 ];do
    septemp=$(echo "($septemp-10)" | bc -l)
    sepstars=$(echo $sepstars+"*")
done

#loop to print a star for every 10 logins in october
octtemp=$(echo $octlogins)
octstars=$(echo "")
while [ $octtemp -ge 10 ];do
    octtemp=$(echo "($octtemp-10)" | bc -l)
    octstars=$(echo $octstars+"*")
done

#loop to print a star for every 10 logins in november
novtemp=$(echo $novlogins)
novstars=$(echo "")
while [ $novtemp -ge 10 ];do
    novtemp=$(echo "($novtemp-10)" | bc -l)
    novstars=$(echo $novstars+"*")
done

#loop to print a star for every 10 logins in december
dectemp=$(echo $declogins)
decstars=$(echo "")
while [ $dectemp -ge 10 ];do
    dectemp=$(echo "($dectemp-10)" | bc -l)
    decstars=$(echo $decstars+"*")
done

#loop to print a star for every 10 logins in total logins section
totaltemp=$(echo $totallogins)
totalstars=$(echo "")
while [ $totaltemp -ge 10 ];do
    totaltemp=$(echo "($totaltemp-10)" | bc -l)
    totalstars=$(echo $totalstars+"*")
done

#final output section
echo "_____________________________"
echo " USER  : $person   "
echo "_____________________________"
echo " Total Login Time: "
echo "_____________________________"
echo " Days:   | $totaldays"
echo " Hours:  | $totalhours"
echo " Minutes | $totalminutes"
echo "_____________________________"
echo " Total Logins Per Month: "
echo "_____________________________"
echo " Aug   | `echo $augstars | sed 's/+//g'` $auglogins"
echo " Sep   | `echo $sepstars | sed 's/+//g'` $seplogins"
echo " Oct   | `echo $octstars | sed 's/+//g'` $octlogins"
echo " Nov   | `echo $novstars | sed 's/+//g'` $novlogins"
echo " Dec   | `echo $decstars | sed 's/+//g'` $declogins"
echo "_____________________________"
echo " TOTAL : `echo $totalstars | sed 's/+//g'` $totallogins"