#!/bin/bash
# Usage: ww -f "window class filter" -c "run if not found"
# Usage: ww -fa "window title filter" -c "run if not found"

TOGGLE="false"
POSITIONAL=()
while [[ $# -gt 0 ]]; do
	key="$1"

	case $key in
	-c | --command)
		COMMAND="$2"
		shift # past argument
		shift # past value
		;;
	-f | --filter)
		FILTERBY="$2"
		shift # past argument
		shift # past value
		;;
	-fa | --filter-alternative)
		FILTERALT="$2"
		shift # past argument
		shift # past value
		;;
	-t | --toggle)
		TOGGLE="true"
		shift # past argument
		;;
	-h | --help)
		HELP="1"
		shift # past argument
		shift # past value
		;;
	*)                  # unknown option
		POSITIONAL+=("$1") # save it in an array for later
		shift              # past argument
		;;
	esac
done

set -- "${POSITIONAL[@]}" # restore positional parameters

if [ -n "$HELP" ]; then
	cat << EOF
ww. Utility to raise or jump an applications in KDE. It interacts with KWin using KWin scripts and it is compatible with X11 and Wayland

Paramaters:

-h  --help                show this help
-f  --filter              filter by window class
-fa --filter-alternative  filter by window title (caption)
-t  --toggle              also minimize the window if it is already active
-c  --command             command to check if running and run if no process is found
EOF
	exit 0
fi

SCRIPT_TEMPLATE=$(
	cat << EOF
function kwinactivateclient(clientClass, clientCaption, toggle) {
  var clients = workspace.clientList();
  var compareToCaption = new RegExp(clientCaption || '', 'i');
  var compareToClass = clientClass;
  var isCompareToClass = clientClass.length > 0
  for (var i=0; i<clients.length; i++) {
      var client = clients[i];
      var classCompare = (isCompareToClass && client.resourceClass == compareToClass)
      var captionCompare = (!isCompareToClass && compareToCaption.exec(client.caption))
      if (classCompare || captionCompare) {
          if (workspace.activeClient != client) {
              workspace.activeClient = client;
          } else if (toggle) {
              client.minimized = true;
          }
          break;
      }
  }
}
kwinactivateclient('CLASS_NAME', 'CAPTION_NAME', TOGGLE);
EOF
)

CURRENT_SCRIPT_NAME=$(basename "$0")

# ensure the script file exists
function ensure_script {
	if [ ! -f SCRIPT_PATH ]; then
		if [ ! -d "$SCRIPT_FOLDER" ]; then
			mkdir -p "$SCRIPT_FOLDER"
		fi
		SCRIPT_CONTENT=${SCRIPT_TEMPLATE/CLASS_NAME/$1}
		SCRIPT_CONTENT=${SCRIPT_CONTENT/CAPTION_NAME/$2}
		SCRIPT_CONTENT=${SCRIPT_CONTENT/TOGGLE/$3}
		#if [ "$1" == "class" ]; then
		#SCRIPT_CONTENT=${SCRIPT_CLASS_NAME/REPLACE_ME/$2}
		#else
		#SCRIPT_CONTENT=${SCRIPT_CAPTION/REPLACE_ME/$2}
		#fi
		echo "$SCRIPT_CONTENT" > "$SCRIPT_PATH"
	fi
}

if [ -z "$FILTERBY" ] && [ -z "$FILTERALT" ]; then
	echo You need to specify a window filter. Either by class -f or by title -fa
	exit 1
fi

IS_RUNNING=$(pgrep -o -a -f "$COMMAND" | grep -v "$CURRENT_SCRIPT_NAME")

if [ -n "$IS_RUNNING" ] || [ -n "$FILTERALT" ]; then

	# trying for XDG_CONFIG_HOME first
	SCRIPT_FOLDER_ROOT=$XDG_CONFIG_HOME
	if [[ -z $SCRIPT_FOLDER_ROOT ]]; then
		# fallback to the home folder
		SCRIPT_FOLDER_ROOT=$HOME
	fi

	SCRIPT_FOLDER="$SCRIPT_FOLDER_ROOT/.wwscripts/"
	SCRIPT_NAME=$(echo "$FILTERBY$FILTERALT" | md5sum | head -c 32)
	SCRIPT_PATH="$SCRIPT_FOLDER$SCRIPT_NAME"
	ensure_script "$FILTERBY" "$FILTERALT" "$TOGGLE"

	SCRIPT_NAME="ww$RANDOM"
	#SCRIPT_NAME=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)

	# install the script
	ID=$(dbus-send --session --dest=org.kde.KWin --print-reply=literal /Scripting org.kde.kwin.Scripting.loadScript "string:$SCRIPT_PATH" "string:$SCRIPT_NAME" | awk '{print $2}')
	# run it - some KDEs version use Script.run others Scripting.run
	dbus-send --session --dest=org.kde.KWin --print-reply=literal "/$ID" org.kde.kwin.Scripting.run > /dev/null 2>&1
	dbus-send --session --dest=org.kde.KWin --print-reply=literal "/$ID" org.kde.kwin.Script.run > /dev/null 2>&1
	# stop it - some KDEs version use Script.run others Scripting.run
	dbus-send --session --dest=org.kde.KWin --print-reply=literal "/$ID" org.kde.kwin.Scripting.stop > /dev/null 2>&1
	dbus-send --session --dest=org.kde.KWin --print-reply=literal "/$ID" org.kde.kwin.Script.stop > /dev/null 2>&1
	# uninstall it
	dbus-send --session --dest=org.kde.KWin --print-reply=literal /Scripting org.kde.kwin.Scripting.unloadScript "string:$SCRIPT_NAME" > /dev/null 2>&1
elif [ -n "$COMMAND" ]; then
	$COMMAND &
fi