#!/bin/sh

set -u

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
          history-pop              Pop one notification from history
          status                   Check if
          status-set [true|false]  Set the status
          debug                    Print debugging information
          help                     Show this help
	EOH
}
dbus_send_checked() {
	dbus-send "$@"
	rc="$?"
	if [ "$rc" -eq "1" ]; then
		echo "Failed to communicate with dunst, is it running? Or maybe the version is outdated." >&2
		echo "Hint: You can try 'dunstctl debug' as a next debugging step." >&2
		exit 1
	fi
}

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
		;;
	"history-pop")
		method_call "${DBUS_IFAC_DUNST}.NotificationShow" >/dev/null
		;;
	"status")
		property_get running | ( read -r _ _ status; printf "%s\n" "${status}"; )
		;;
	"status-set")
		[ "${2:-}" ] \
			|| die "No status parameter specified. Please give either 'true' or 'false' as running parameter."
		[ "${2}" = "true" ] || [ "${2}" = "false" ] \
			|| die "Please give either 'true' or 'false' as running parameter."
		property_set running variant:boolean:"${2}"
		;;
	"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