#!/bin/bash

# Created By: srdusr
# Created On: Tue 07 Mar 2023 15:06:47 PM CAT
# Project: Agnostic scratchpad/dropdown terminal that works on most window managers

# Dependencies: wmctrl, xprop, xdo, xdotool
# NOTE: Ensure script is included in system's path and can therefore be invoked with the command 'scratchpad'.
#       Furthermore make sure the terminal is using x11 as a backend in wayland to allow this to work.
#       Example: wezterm.lua: enable_wayland = false,
#                 kitty.conf: linux_display_server x11

# Set the environment variables to x11 to allow working in Wayland
#export GDK_BACKEND=x11
#export QT_QPA_PLATFORM=xcb
#export WAYLAND_DISPLAY=""
#export WINIT_UNIX_BACKEND=x11
#export WAYLAND_DISPLAY=wayland-0

# Supported terminals and dropdown class
supported_terminals=("wezterm" "kitty" "alacritty")

# Check if any supported terminal with scratchpad class is running
for term in "${supported_terminals[@]}"; do
  if pgrep -f "$term.*--class scratchpad" >/dev/null; then
    my_term="$term"
    break
  fi
done

# If no supported terminal is running, start the first available one
if [ "$my_term" = "" ]; then
  for term in "${supported_terminals[@]}"; do
    if command -v "$term" >/dev/null 2>&1; then
      my_term="$term"
      break
    fi
  done
  if [ "$my_term" = "" ]; then
    echo "No supported terminal found." && exit 1
  fi

  # Start terminal with scratchpad class
  case "$my_term" in
  "wezterm") wezterm start --class scratchpad -e tmux new-session -A -s tmux -e bash & ;;
  "kitty") kitty --class scratchpad tmux new-session -A -s tmux -e bash & ;;
  "alacritty") alacritty --class scratchpad -e tmux new-session -A -s tmux -e bash & ;;
  esac
fi

# Get the window ID of the scratchpad terminal
id="$(xdo id -N scratchpad)"
# Get the ID of the currently focused window
focused_id="$(xdotool getwindowfocus)"

# Get class of the currently focused window
focused_class="$(xprop -id "$focused_id" WM_CLASS 2>/dev/null | awk -F '"' '{print $4}')"

# Toggle visible/hide and smart focus
if [ "$id" != "" ]; then
  if xwininfo -id "$id" | grep "Map State: IsViewable" >/dev/null; then
    if [ "$focused_id" = "$id" ] || [ "$focused_class" = "scratchpad" ]; then
      # Scratchpad is focused, hide it
      dimensions="$(xwininfo -id "$id" | awk '/Width:|Height:/ { printf("%s=%s;", tolower($1), $2) }')"
      xdo hide "$id" 2>/dev/null
    else
      # Scratchpad is visible but not focused
      xdotool windowactivate "$id"
      xdotool windowfocus "$id"
      hyprctl dispatch focuswindow scratchpad
    fi
  else
    # Scratchpad is hidden, show and focus it
    xdo show "$id"
    xdotool windowsize "$id" "$(echo "$dimensions" | tr ';' ' ')" 2>/dev/null
    xdotool windowactivate "$id"
    xdotool windowfocus "$id"
    hyprctl dispatch focuswindow scratchpad
  fi
fi

## Get the window ID of the PiP window by title
#pip_id="$(xdo id -n "Picture-in-Picture")"
#
## Toggle scratchpad terminal visibility
#if [ "$id" != "" ]; then
#  if xwininfo -id "$id" | grep "Map State: IsViewable" >/dev/null; then
#    # Scratchpad is visible, hide it
#    dimensions="$(xwininfo -id "$id" | awk '/Width:|Height:/ { printf("%s=%s;", tolower($1), $2) }')"
#    xdo hide "$id" 2>/dev/null
#  else
#    # Scratchpad is hidden, show it and restore dimensions
#    xdo show "$id"
#    xdotool windowsize "$id" "$(echo "$dimensions" | tr ';' ' ')" 2>/dev/null
#    xdotool windowactivate "$id"
#    xdotool windowfocus "$id"
#
#    # Adjust layer based on PiP window presence
#    if [ "$pip_id" != "" ]; then
#      hyprctl dispatch layer "$id" 1
#    else
#      hyprctl dispatch layer "$id" 0
#    fi
#
#    hyprctl dispatch focuswindow scratchpad
#  fi
#fi

## Get the window ID of the scratchpad terminal
#id=$(hyprctl clients -j | jq -r '.[] | select(.class=="scratchpad").address')
#
## Toggle scratchpad terminal visibility
#if [ -n "$id" ]; then
#  focused=$(hyprctl activewindow -j | jq -r '.address')
#  if [ "$focused" = "$id" ]; then
#    # Scratchpad is focused, minimize it
#    hyprctl dispatch move "address:$id workspace silent 0"
#  else
#    # Show scratchpad, set above normal windows but below PiP
#    hyprctl dispatch movetoworkspace current address:$id
#    hyprctl dispatch focuswindow address:$id
#    hyprctl dispatch layer "address:$id above"
#    hyprctl dispatch focuswindow address:$id
#  fi
#fi

## Get the window ID of the PiP window by title
#pip_id=$(hyprctl clients -j | jq -r '.[] | select(.title=="Picture-in-Picture").address')
#
## Toggle scratchpad terminal visibility
#if [ -n "$id" ]; then
#  focused=$(hyprctl activewindow -j | jq -r '.address')
#  if [ "$focused" = "$id" ]; then
#    # Scratchpad is focused, minimize it
#    hyprctl dispatch move "address:$id workspace silent 0"
#  else
#    # Show scratchpad, set above normal windows but below PiP
#    hyprctl dispatch movetoworkspace current address:$id
#    hyprctl dispatch focuswindow address:$id
#    if [ -n "$pip_id" ]; then
#      hyprctl dispatch layer "address:$id below"
#    else
#      hyprctl dispatch layer "address:$id above"
#    fi
#    hyprctl dispatch focuswindow address:$id
#  fi
#fi