#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  msg [-X|-s|-S|-m|-D|-b] [MESSAGE]
		  msg -h
	EOF
}

help() {
	cat <<-'EOF'

		Options:
		  -X            send MESSAGE using the `xmpp` command
		  -s            play $XDG_DATA_HOME/msg/medium.ogg sound
		  -S            say MESSAGE using `speak`
		  -m            send email with MESSAGE as subject and empty body
		  -D            send desktop MESSAGE via `notify-send`
		  -b            print terminal bell
		  -h, --help    show this message

		  MESSAGE       the text to be sent by the relevant channel

		Examples:

		  Ring a terminal bell and play a sound:

		    $ msg -sb

		  Send an email and an XMPP message:

		    $ msg -mX 'The message goes here'
	EOF
}

for flag in "$@"; do
	case "$flag" in
		--)
			break
			;;
		--help)
			usage
			help
			exit
			;;
		*)
			;;
	esac
done

sound() {
	play "$XDG_DATA_HOME"/msg/medium.ogg 2>/dev/null
}

XMPP=false
SOUND=false
SPEAK=false
MAIL=false
DESKTOP=false
BELL=false
ACTION_DONE=false
SHOW_USAGE=false
while getopts 'XsSmDbh' flag; do
	case "$flag" in
		X)
			XMPP=true
			ACTION_DONE=true
			;;
		s)
			SOUND=true
			ACTION_DONE=true
			;;
		S)
			SPEAK=true
			ACTION_DONE=true
			;;
		m)
			MAIL=true
			ACTION_DONE=true
			;;
		D)
			DESKTOP=true
			ACTION_DONE=true
			;;
		b)
			BELL=true
			ACTION_DONE=true
			;;
		h)
			usage
			help
			exit
			;;
		*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))

if [ "$ACTION_DONE" = false ]; then
	sound
	usage
	help
	exit
fi


MESSAGE="${1:-}"

assert_arg() {
	if [ -z "$1" ]; then
		printf 'Missing %s.\n\n' "$2" >&2
		usage >&2
		exit 2
	fi
}

if [ "$XMPP" = true ]; then
	assert_arg "$MESSAGE" '-X MESSAGE'
	xmpp -m "$MESSAGE" eu@euandreh.xyz &
fi
if [ "$SOUND" = true ]; then
	sound &
fi
if [ "$SPEAK" = true ]; then
	assert_arg "$MESSAGE" '-S MESSAGE'
	echo "$MESSAGE" | speak -v pt-BR &
fi
if [ "$MAIL" = true ]; then
	assert_arg "$MESSAGE" '-m MESSAGE'
	echo " " | email -s "$MESSAGE" eu@euandre.org &
fi
if [ "$DESKTOP" = true ]; then
	assert_arg "$MESSAGE" '-D MESSAGE'
	notify-send "$MESSAGE" &
fi
if [ "$BELL" = true ]; then
	printf '\a' &
fi

wait