#! /bin/bash

TIME_LENGTH_TIL_AWAY=1 #660
startedTimeout="n"
away="n"
alertedHome="n"
alertedAway="n"
IP="172.16.1.82" #82

#stdbuf -oL arping "$IP" | while read line
while read line
do
  echo "$line"
  if [ "$line" = "Timeout" ]; then
    if [ "$startedTimeout" = "n" ]; then
      alertedAway="n"
      startedTimeout="y"
      beginOfTimeout=$(date +%s)
      echo "started timeout. begin time= $beginOfTimeout"
    else
      if [ `expr $(date +%s) - $beginOfTimeout` -ge $TIME_LENGTH_TIL_AWAY ]; then
        away="y"
        if [ "$alertedAway" = "n" ]; then
          #alert away
          curl -X POST "https://ths.tnet.space/gotify/message?token=A9jDrGFO6Ob-m88" -F "title=Status" -F "message=Away" -F "priority=4"
#          echo "away"
          alertedAway="y"
          alertedHome="n"
        fi
      fi
    fi 
  else
    if [ "$startedTimeout" = "y" ]; then
      startedTimeout="n"
      if [ "$alertedAway" = "y" ]; then
        away="n"
        #alert home
        curl -X POST "https://ths.tnet.space/gotify/message?token=A9jDrGFO6Ob-m88" -F "title=Status" -F "message=Home" -F "priority=4"
#        echo "home"
        alertedHome="y"
        alertedAway="n"
      fi
    fi
  fi
done < <(stdbuf -oL arping "$IP")

# if != Timeout then here; reset timer to 0
# if == Timeout for more than x minutes then not here