#!/usr/bin/env bash

#
# Delete_User - Automates the 4 steps to remove an account
#
#################################################################
#
# Define Functions
#
#################################################################
function get_answer {
	#
	unset ANSWER
	ASK_COUNT=0
	#
	while [ -z "$ANSWER" ] # while no answer is given, keep asking
	do
		ASK_COUNT=$[ $ASK_COUNT + 1 ]
		#
		case $ASK_COUNT in
		# If user gives no answer in time allowed
			2)
				echo
				echo "Please answer the question."
				echo
			;;
			3)
				echo
				echo "One last try... please answer the question."
				echo
			;;
			4)
				echo
				echo "Since you refuse to answer the question..."
				echo "exiting program."
				echo
				#
				exit
			;;
		esac
		#
		echo
		#
		if [ -n "$LINE2" ]
		then
			echo $LINE1 # Print 2 lines
			echo -e $LINE2" \c"
		else
			# Print 1 line
			echo -e $LINE1" \c"
		fi
		#
		# Allow 60 seconds to answer before time-out
		read -t 60 ANSWER
	done
	#
	# Do a little variable clean-up
	#
	unset LINE1
	unset LINE2
	#
}

#end of get_answer function
#
#################################################################
function process_answer {
	#
	case $ANSWER in
		y | Y | YES | yes | yEs | yeS | YEs | yES)
		# If user answers "yes".do nothing.
		;;
		*)
		# If user answers anything but "yes", exit script
			echo
			echo $EXIT_LINE1
			echo $EXIT_LINE2
			echo
			exit
		;;
	esac
	#
	# Do a little variable clean-up
	unset EXIT_LINE1
	unset EXIT_LINE2
	#
}

#End of process_answer function
#
################################################################
#
# End of Function Definitions
#
############### Main Script #################################
#
# Get name of User Account to check
#
echo "Step #1 - Determine User Account name to delete "
echo
LINE1="Please enter the username of the user"
LINE2="account you wish to delete from system:"
get_answer
USER_ACCOUNT=$ANSWER
#
# Double check with script user that this is the correct User Account
#
LINE1="Is $USER_ACCOUNT the user account"
LINE2="you wish to delete from the system?[ y/n ]:"
get_answer
#
############################################################
#
# Check that USER_ACCOUNT is really an account on the system
#
USER_ACCOUNT_RECORD=$(cat /etc/passwd | grep -w $USER_ACCOUNT)
#
if [ $? -eq 1 ] # If the account is not found, exit script
then
	echo
	echo "Account, $USER_ACCOUNT, not found."
	echo "Leaving the script..."
	echo
	exit
fi
#
echo
echo "I found this record:"
echo $USER_ACCOUNT_RECORD
echo
#
LINE1="Is this the correct User Account?[y/n]:"
get_answer
#
#
# Call process_answer function:
#	if user answers anything but "yes", exit script
#
EXIT_LINE1="Because the account, $USER_ACCOUNT, is not "
EXIT_LINE2="the one you wish to delete, we are leaving the script..."
process_anser
#
##############################################################
#
# Search for any running processes that belong to the User Account
#
echo
echo "Step #2 - Find process on system belonging to user account"
echo
echo "$USER_ACCOUNT has the following processes running: "
echo
#
ps -u $USER_ACCOUNT #List the processes running
#
case $? in
	1) # No processes running for this User Account
	#
		echo "There are no processes for this account currently running."
		echo
	;;
	0) # Processes running for this User Account.
	# Ask Script User if wants us to kill the processes.
	#
		unset ANSWER # I think this line is not needed
		LINE1="Would you like me to kill the process(es)? [y/n]:"
		get_answer
		#
		case $ANSWER in
			y | Y | YES | yes | Yes | yEs | yeS | YEs | yES) # if user answer "yes",
			#kill User Account processes
			#
				echo
				#
				# Clean-up temp file upon signals
				#
				trap "rm$USER_ACCOUNT_Running_Process.rpt" SIGTERM SIGINT SIGQUIT
				#
				# List user processes running
				ps -u $USER_ACCOUNT > $USER_ACCOUNT_Running_Process.rpt
				#
				exec < $USER_ACCOUNT_Running_Process.rpt # Make report Std Input
				#
				read USER_PROCESS_REC # First record will be blank
				read USER_PROCESS_REC
				#
				while [ $? -eq 0 ]
				do
					# obtain PID
					USER_PID=$(echo $USER_PROCESS_REC | cut -d " " -f1)
					kill -9 $USER_PID
					echo "Killed process $USER_PID"
					read USER_PROCESS_REC
				done
				#
				echo
				#
				rm $USER_ACCOUNT_Running_Process.rpt # Remove temp report
			;;
			*) # If user answers anything but "yes", do not kill.
				echo
				echo "Will not kill the process(es)."
				echo
			;;
		esac
	;;
esac
###################################################################################
#
# Create a report of all files owned by User Account
#
echo
echo "Step #3 - Find files on system belonging to user account"
echo
echo "Creating a report of all files owned by $USER_ACCOUNT."
echo
echo "It is recommended that you backup/archive these files."
echo "and then do one of two things:"
echo " 1) Delete the files"
echo " 2) Change the files' ownership to a current user account."
echo
echo "Please wait. This may take a while..."
#
REPORT_DATE=`date +%y%m%d`
REPORT_FILE=$USER_ACCOUNT"_Files_"$REPORT_DATE".rpt"
#
find / -user $USER_ACCOUNT > $REPORT_FILE 2> /dev/null
#
echo
echo "Report is complete."
echo "Name of report:	$REPORT_FILE"
echo "Location of report:     `pwd`"
echo
################################################################
#
# Remove User Account
echo
echo "Step #4 - Remove user account"
echo
#
LINE1="Do you wish to remove $USER_ACCOUNT's account from system? [y/n]:"
get_answer
#
# Cass process_answer function:
#	if user answers anything but "yes", exit script
#
EXIT_LINE1="Since you do not wish to remove the user account."
EXIT_LINE2="$USER_ACCOUNT at this time, exiting the script..."
process_answer
#
userdel $USER_ACCOUNT # delete user account
echo
echo "User account, $USER_ACCOUNT, has been removed"
echo
#
