#!/bin/bash
cd ~/projects/scripts
xset -b #disable scrot beep
#!/bin/bash

# Dependencies: imagemagick, i3lock-color-git, scrot

IMAGE=$(mktemp).png
TEXT="Type password to unlock"

VALUE="60" #brightness value to compare to
scrot $IMAGE
COLOR=`convert $IMAGE -colorspace hsb -resize 1x1 txt:- | sed -E '/.*$/ {
                             N
                             s/.*\n.*([0-9]{1,2}[^\.])\.[0-9]+%\)$/\1/
                             }'`;
# pixelate: -scale 10% -scale 1000%
if [ "$COLOR" -gt "$VALUE" ]; then #white background image and black text
    convert $IMAGE -level 0%,100%,0.6 -filter Gaussian -resize 20% -define filter:sigma=1.5 -resize 500% -font Liberation-Sans -pointsize 26 -fill black -gravity center -annotate +0+160 "$TEXT" - | composite -gravity center lockdark.png - $IMAGE
    PARAM='--textcolor=00000000 --insidecolor=0000001c --ringcolor=0000003e --linecolor=00000000 --keyhlcolor=ffffff80 --ringvercolor=ffffff00 --insidevercolor=ffffff1c --ringwrongcolor=ffffff55 --insidewrongcolor=ffffff1c'
else #black
    convert $IMAGE -level 0%,100%,0.6 -filter Gaussian -resize 20% -define filter:sigma=1.5 -resize 500% -font Liberation-Sans -pointsize 26 -fill white -gravity center -annotate +0+160 "$TEXT" - | composite -gravity center lock.png - $IMAGE
    PARAM='--textcolor=ffffff00 --insidecolor=ffffff1c --ringcolor=ffffff3e --linecolor=ffffff00 --keyhlcolor=00000080 --ringvercolor=00000000 --insidevercolor=0000001c --ringwrongcolor=00000055 --insidewrongcolor=0000001c'
fi

# try to use a forked version of i3lock with prepared parameters
i3lock $PARAM -i $IMAGE > /dev/null 2>&1

if [ $? -ne 0 ]; then
    # We have failed, lets get back to stock one
    i3lock -i $IMAGE
fi

rm $IMAGE