#Place to /lib/systemd/system-sleep/
#!/bin/bash

hibernation_timeout=10800  #3 hours

if [ "$2" = "suspend" ]; then
    curtime=$(date +%s)
    if [ "$1" = "pre" ]; then
        echo -e "[($curtime) $@]nExecuting pre-suspend hook..." >> /tmp/delayed_hibernation.log
        echo "$curtime" > /var/run/delayed_hibernation.lock
        rtcwake -m no -s $hibernation_timeout
    elif [ "$1" = "post" ]; then
        echo -e "[($curtime) $@]nExecuting post-suspend hook..." >> /tmp/delayed_hibernation.log
        sustime=$(cat /var/run/delayed_hibernation.lock)
        if [ $(($curtime - $sustime)) -ge $hibernation_timeout ]; then
            echo -e "Automatic resume detected, hibernating.n" >> /tmp/delayed_hibernation.log
            systemctl hibernate || systemctl suspend
        else
            echo -e "Manual resume detected, clearing RTC alarm.n" >> /tmp/delayed_hibernation.log
            rtcwake -m no -s 1
        fi
        rm /var/run/delayed_hibernation.lock
    fi
fi