#!/bin/bash

START_DATE=`date`

mapfile -t ORIGINAL_NETSTATES < <(ip addr | grep " state " | sed -e "s/.* \(.*\):.*state \(.*\) group.*/\1 \2/")

while true; do
	sleep 5
	mapfile -t NETSTATES < <(ip addr | grep " state " | sed -e "s/.* \(.*\):.*state \(.*\) group.*/\1 \2/")

	for (( i=0; i<${#ORIGINAL_NETSTATES[@]}; ++i)); do
		for (( j=0; j<${#NETSTATES[@]}; ++j)); do
			OLDSTATE=(`echo ${ORIGINAL_NETSTATES[$i]}`)
			NEOSTATE=(`echo ${NETSTATES[$j]}`)

			if [ ${OLDSTATE[0]} = ${NEOSTATE[0]} ]; then
				if [ ${OLDSTATE[1]} = "UP" ]; then
					if [ ${NEOSTATE[1]} != "UP" ]; then
						# Alert
						echo "ALERT"
						zenity --error --text='Egy hálózati device leállt!'
					fi
				fi
				echo "Original: ${ORIGINAL_NETSTATES[$i]} Current: ${NETSTATES[$j]}"
			fi
		done
	done
done