#!/usr/bin/env bash

# Dependency: sudo apt install wmctrl
# set custom shortcut: raise_cycle_run
# ~/.zmeta/bin/raise_cycle_run gnome-terminal-server "Gnome-terminal" (can vary check with wmctrl -x -l )

if [ $# -ne 2 ]; then
    exit 1
fi

count=$(wmctrl -x -l | grep -c "$2")
sanity=$(echo "$2" | tr '[:upper:]' '[:lower:]')

# if the window count is greater or equal to 2 then cycle through focusing the windows
if [[ $count -ge 2 ]]; then

    # Get id of the focused window.
    active_win_id=$(xprop -root | grep '^_NET_ACTIVE_W' | awk -F'# 0x' '{print $2}')

    # Get window manager class of focused window.
    win_class=$(wmctrl -x -l | grep "$active_win_id" | awk '{print $2 " " $3}')

    # Retrieve list of all windows matching with the class above.
    win_list=$(wmctrl -x -l | grep -- "$win_class" | awk '{print $1}')

    # Find the next window to focus.
    switch_to=$(echo "$win_list" | awk -v active_win_id="$active_win_id" '$0~active_win_id{p=1;next} p{print $1;exit}')

    # If the current window is the last in the list, take the first one.
    if [ -z "$switch_to" ]; then
        switch_to=$(echo "$win_list" | awk 'NR==1{print}')
    fi

    wmctrl -i -a "$switch_to"

# Else window count is 0 or 1 then call the sanitized window title to invoke an instance
else
    $sanity &>/dev/null
fi