#!/usr/bin/env sh

set -x -e

trap_notifications() {
	pkill -u "$USER" -USR1 dunst
}

untrap_notifications() {
	pkill -u "$USER" -USR2 dunst
}

lock() {
	lock_image="$1"
	trap_notifications
	i3lock -n -i "$lock_image" \
		--inside-color="00000000" \
		--ring-color="00000033" \
		--separator-color="00000000" \
		--insidever-color="00000000" \
		--insidewrong-color="ff000033" \
		--keyhl-color="ffffff77" \
		--bshl-color="ffffff77" \
		--ringver-color="00000000" \
		--ringwrong-color="00000000" \
		--greeter-color="00000000" \
		--line-color="00000000" \
		--verif-text="" \
		--wrong-text="" \
		--noinput-text="" \
		--pass-media-keys \
		--pass-screen-keys \
		--pass-volume-keys \
		--pass-power-keys
	untrap_notifications
}

create_lock_image() {
	image=$(mktemp --suffix=.png)
	command -- import -silent -window root "$image"

    primary_monitor_info=$(xrandr | grep primary | awk '{print $4}')
    if [[ $primary_monitor_info == *+* ]]; then
        resolution=$(echo $primary_monitor_info | cut -d'+' -f1)
        offset_x=$(echo $primary_monitor_info | cut -d'+' -f2)
        offset_y=$(echo $primary_monitor_info | cut -d'+' -f3)
    else
        resolution=$(xrandr | grep '*' | awk '{print $1}')
        offset_x=0
        offset_y=0
    fi
    width=$(echo $resolution | cut -d'x' -f1)
    height=$(echo $resolution | cut -d'x' -f2)
    center_x=$(($offset_x + $width / 2))
    center_y=$(($offset_y + $height / 2))
    
    convert "$image" -filter Gaussian -resize 20% -define "filter:sigma=4.5" -resize 500.5% \
            "$HOME/img/lib/lock.png" -gravity NorthWest -geometry +${center_x}+${center_y} -composite "$image"
	echo "$image"
}

command -v notify-send >/dev/null && notify-send "Locking..."
image=$(create_lock_image)
lock "$image"
rm "$image"