#!/bin/bash

me="$(readlink -f "$0")"
timeout=240
notify=10

case "$1" in
    start)
        xset s $(($timeout - $notify)) $notify
        xset dpms $(($timeout * 2)) $(($timeout * 3)) $(($timeout * 4))
        exec xss-lock -n "$me notify" -l $me lock
        ;;
    dim|notify)
        echo "$(date --rfc-3339=seconds) $me: notify: start"
        trap 'exit 0' TERM INT
        trap "kill %% ; wait" EXIT
        notify-send "Lock screen" -t $(($notify * 1000)) \
            "Screen will be locked in 10 seconds..."
        echo "$(date --rfc-3339=seconds) $me: notify: end"
        sleep 2147483647 &
        wait
        ;;
    lock)
        i3lock_options="-e -i $HOME/.cache/awesome/current-wallpaper.png"
        echo "$(date --rfc-3339=seconds) $me: lock: lock screen"
        if [ -e /proc/self/fd/${XSS_SLEEP_LOCK_FD:--1} ]; then
            trap 'kill %%' TERM INT
            i3lock -n $i3lock_options {XSS_SLEEP_LOCK_FD}<&- &
            sleep 0.3           # Slight race condition, better than an active loop
            exec {XSS_SLEEP_LOCK_FD}<&-
            wait
        else
            trap 'kill %%' TERM INT
            i3lock -n $i3lock_options &
            wait
        fi
        echo "$(date --rfc-3339=seconds) $me: lock: unlock screen"
        ;;
esac