#!/bin/bash

# 2022 R. Branten
# ----
# This script manages window positioning and sizing on X11 systems
# It allows positioning windows in different preset layouts using xdotool and wmctrl
# Requires xdpyinfo, xdotool and wmctrl to be installed
# ----

# check if xdpyinfo is installed
if ! command -v xdpyinfo &> /dev/null
then
    notify-send WindowManagement: "xdpyinfo not installed"
    exit 1
fi

# check if xdotool is installed
if ! command -v xdotool &> /dev/null
then
    notify-send WindowManagement: "xdotool not installed"
    exit 1
fi

# check if wmctrl is installed
if ! command -v wmctrl &> /dev/null
then
    notify-send WindowManagement: "wmctrl not installed"
    exit 1
fi

# Function to get usable screen height (screen height minus panel height)
get_usable_height() {
    local screen_height=$(xdpyinfo | awk '/dimensions/{print $2}' | grep -oE [[:digit:]]\+$)
    local panel_height=$(xdotool getwindowgeometry  $(xdotool search --onlyvisible --class 'panel') | awk '/Geometry/{print $2}' | grep -oE [[:digit:]]\+$)
    local margin=26 # For window decoration subtract margin
    echo $((screen_height - panel_height - margin))
}

# extract and set argument
case $1 in
    center)
        # center window, unused as native window size is used
        WIDTH=100%
        XPOS=50%
        MESSAGE="center"
        ;;
    center50)
        # set window to 50% of screen and place in center of screen
        WIDTH=50%
        XPOS=25%
        MESSAGE="50% center"
        ;;
    left25)
        # put a window to 25% of screen and place in left side of screen
        WIDTH=25%
        XPOS=0%
        MESSAGE="25% left"
        ;;
    right25)
        # put a window to 25% of screen and place in right side of screen
        WIDTH=25%
        XPOS=75%
        MESSAGE="25% right"
        ;;
    left50)
        # put a window to 50% of screen and place in left side of screen
        WIDTH=50%
        XPOS=0%
        MESSAGE="50% left"
        ;;
    right50)
        # put a window to 50% of screen and place in right side of screen
        WIDTH=50%
        XPOS=50%
        MESSAGE="50% right"
        ;;
    centerleft25)
        # 25% window size left side of center screen
        WIDTH=25%
        XPOS=25%
        MESSAGE="25% left from center"
        ;;
    centerright25)
        # 25% window size right side of center screen
        WIDTH=25%
        XPOS=50%
        MESSAGE="25% right from center"
        ;;
    *)
        echo "usage: $0 [center|center50|left25|right25|left50|right50|centerleft25|centerright25]"
        exit
        ;;
esac

# get current window
currentWindow=$(xdotool getactivewindow)

# undo maximized
wmctrl -ir "$currentWindow" -b remove,maximized_vert,maximized_horz

# resize
xdotool getactivewindow windowsize $WIDTH "$(get_usable_height)"

# move window to location steer clear of top
xdotool getactivewindow windowmove $XPOS 0.1

# display alert window
notify-send WindowManagement: "${MESSAGE}"