#!/bin/bash

CONFIG_DIR="$HOME/.config/deskgrid"
CONFIG_FILE="$CONFIG_DIR/deskgrid.conf"
source <(grep = $CONFIG_FILE)

GAP=${gap:-16}
GRID_X=${grid_x:-12}
GRID_Y=${grid_y:-6}

AVAILSIZE=$(wmctrl -d |grep "*"|awk -F' ' '{print $9}')
AVAIL_X="${AVAILSIZE%x*}"
AVAIL_Y="${AVAILSIZE#*x}"

TILE_WIDTH="$((AVAIL_X/GRID_X))"
TILE_HEIGHT="$((AVAIL_Y/GRID_Y))"

rectangles=""
    row="0"
    for row in $(seq 0 $((GRID_Y-1)));
    do
        for tile in $(seq 0 $((GRID_X-1)));
            do 
            rectangles+="rectangle $((tile*TILE_WIDTH)),$((row*TILE_HEIGHT)) $((tile*TILE_WIDTH+TILE_WIDTH)),$((row*TILE_HEIGHT+TILE_HEIGHT)) ";
        done
    done
text="text $((4)),$((26)) \"Hello I'm here to help you get familiar with DrawGrid ;)\nGrid: $GRID_X rows, $GRID_Y columns\nSingle tile size: $TILE_WIDTH x $TILE_HEIGHT\n\nUse mousewheel on taskbar to show/hide me\nTo close me: middle click on taskbar or click here, then hit q key\""
magick -size $AVAILSIZE xc:LavenderBlush3 -stroke LavenderBlush2 -strokewidth 1 \
   -fill LavenderBlush3 \
   -draw "$rectangles" \
   -style Normal +stroke -pointsize 14 -fill gray16 -draw "$text" \
   /tmp/grid.png
feh -N -x -g "$AVAILSIZE" --title "DrawGrid helper" /tmp/grid.png > /dev/null 2>&1 &
sleep 1
dghelper=$(wmctrl -l -p |grep "DrawGrid helper")

read -r A B C D< <(echo $dghelper)

wmctrl -i -r "$A" -b add,below