#!/bin/sh

set -eu

DBUS_NAME="org.freedesktop.Notifications"
DBUS_PATH="/org/freedesktop/Notifications"
DBUS_IFAC_DUNST="org.dunstproject.cmd0"
DBUS_IFAC_PROP="org.freedesktop.DBus.Properties"
DBUS_IFAC_FDN="org.freedesktop.Notifications"

die(){ printf "%s\n" "${1}" >&2; exit 1; }

show_help() {
	cat <<-EOH
	Usage: dunstctl <command> [parameters]"
	Commands:
	  action                            Perform the default action, or open the
	                                    context menu of the notification at the
	                                    given position
	  close                             Close the last notification
	  close-all                         Close the all notifications
	  context                           Open context menu
	  count [displayed|history|waiting] Show the number of notifications
	  history-pop                       Pop one notification from history
	  is-paused                         Check if dunst is running or paused
	  set-paused [true|false|toggle]    Set the pause status
	  debug                             Print debugging information
	  help                              Show this help
	EOH
}
dbus_send_checked() {
	dbus-send "$@" \
		|| die "Failed to communicate with dunst, is it running? Or maybe the version is outdated. You can try 'dunstctl debug' as a next debugging step."
}

method_call() {
	dbus_send_checked --print-reply=literal --dest="${DBUS_NAME}" "${DBUS_PATH}" "$@"
}

property_get() {
	dbus_send_checked --print-reply=literal --dest="${DBUS_NAME}" "${DBUS_PATH}" "${DBUS_IFAC_PROP}.Get" "string:${DBUS_IFAC_DUNST}" "string:${1}"
}

property_set() {
	dbus_send_checked --print-reply=literal --dest="${DBUS_NAME}" "${DBUS_PATH}" "${DBUS_IFAC_PROP}.Set" "string:${DBUS_IFAC_DUNST}" "string:${1}" "${2}"
}

command -v dbus-send >/dev/null 2>/dev/null || \
	die "Command dbus-send not found"


case "${1:-}" in
	"action")
		method_call "${DBUS_IFAC_DUNST}.NotificationAction" "int32:${2:-0}" >/dev/null
		;;
	"close")
		method_call "${DBUS_IFAC_DUNST}.NotificationCloseLast" >/dev/null
		;;
	"close-all")
		method_call "${DBUS_IFAC_DUNST}.NotificationCloseAll" >/dev/null
		;;
	"context")
		method_call "${DBUS_IFAC_DUNST}.ContextMenuCall" >/dev/null
		;;
	"count")
		[ $# -eq 1 ] || [ "${2}" = "displayed" ] || [ "${2}" = "history" ] || [ "${2}" = "waiting" ] \
			|| die "Please give either 'displayed', 'history', 'waiting' or none as count parameter."
		if [ $# -eq 1 ]; then
			property_get waitingLength   | ( read -r _ _ waiting;   printf "              Waiting: %s\n" "${waiting}" )
			property_get displayedLength | ( read -r _ _ displayed; printf "  Currently displayed: %s\n" "${displayed}" )
			property_get historyLength   | ( read -r _ _ history;   printf "              History: %s\n" "${history}")
		else
			property_get ${2}Length | ( read -r _ _ notifications; printf "%s\n" "${notifications}"; )
		fi
		;;
	"history-pop")
		method_call "${DBUS_IFAC_DUNST}.NotificationShow" >/dev/null
		;;
	"is-paused")
		property_get paused | ( read -r _ _ paused; printf "%s\n" "${paused}"; )
		;;
	"set-paused")
		[ "${2:-}" ] \
			|| die "No status parameter specified. Please give either 'true', 'false' or 'toggle' as paused parameter."
		[ "${2}" = "true" ] || [ "${2}" = "false" ] || [ "${2}" = "toggle" ] \
			|| die "Please give either 'true', 'false' or 'toggle' as paused parameter."
		if [ "${2}" = "toggle" ]; then
			paused=$(property_get paused | ( read -r _ _ paused; printf "%s\n" "${paused}"; ))
			if [ "${paused}" = "true" ]; then
				property_set paused variant:boolean:false
			else
				property_set paused variant:boolean:true
			fi
		else
			property_set paused variant:boolean:"$2"
		fi
		;;
	"help"|"--help"|"-h")
		show_help
		;;
	"debug")
		dbus-send --print-reply=literal --dest="${DBUS_NAME}" "${DBUS_PATH}" "${DBUS_IFAC_FDN}.GetServerInformation" >/dev/null 2>/dev/null \
			|| die "Dunst is not running."

		dbus-send --print-reply=literal --dest="${DBUS_NAME}" "${DBUS_PATH}" "${DBUS_IFAC_FDN}.GetServerInformation" \
			| (
					read -r name _ version _
					[ "${name}" = "dunst" ]
					printf "dunst version: %s\n" "${version}"
				) \
			|| die "Another notification manager is running. It's not dunst"

		dbus-send --print-reply=literal --dest="${DBUS_NAME}" "${DBUS_PATH}" "${DBUS_IFAC_DUNST}.Ping" >/dev/null 2>/dev/null \
			|| die "Dunst controlling interface not available. Is the version too old?"
		;;
	"")
		die "dunstctl: No command specified. Please consult the usage."
		;;
	*)
		die "dunstctl: unrecognized command '${1:-}'. Please consult the usage."
		;;
esac