#!/bin/bash

me="$(readlink -f "$0")"
timeout=300
notify=10

configure() {
    xset s $((timeout - notify)) $notify
    xset dpms $((timeout * 3)) $((timeout * 4)) $((timeout * 5))
}
unconfigure() {
    xset s 0
    xset dpms 0 0 0
}

case "$1" in
    start)
        configure
        exec xss-lock -n "$me notify" -l $me lock
        ;;
    dim|notify)
        echo "$(date --rfc-3339=seconds) $me: notify: start"
        pkill -STOP redshift
        trap 'pkill -CONT redshift' EXIT
        trap 'kill %%; exit 0' HUP
        trap 'sleep 1s; kill %%; exit 0' TERM
        outputs=$(xrandr -q | sed -n 's/\([^ ]*\) connected .*/\1/p')
        for i in $(seq 0.7 -0.01 0.1); do
            for out in $outputs; do
                xrandr --output $out --brightness $i
            done
            sleep 0.02
        done
        echo "$(date --rfc-3339=seconds) $me: notify: end"
        sleep infinity &
        wait
        ;;
    lock)
        # Something may have mendled with screensaver settings
        configure
        # First, stop any music player
        xdotool key XF86AudioStop
        # Then, lock screen
        echo "$(date --rfc-3339=seconds) $me: lock: lock screen"
        systemctl --user stop compton@$(systemd-escape -- "$DISPLAY").service
        i3lock -n -e -i $HOME/.cache/awesome/current-wallpaper.png -t -f
        systemctl --user start compton@$(systemd-escape -- "$DISPLAY").service
        echo "$(date --rfc-3339=seconds) $me: lock: unlock screen"
        ;;
esac