#!/usr/bin/env bash
# Copyright (C) 2018  Luke Shumaker
# Copyright (C) 2023-2024  Umorpha Systems
# SPDX-License-Identifier: AGPL-3.0-or-later
declare -r NAME=osi-shell
declare -r VERSION=20231023

set -euE

install_prefix="$(realpath --logical --canonicalize-missing -- "${BASH_SOURCE[0]}/../..")"
readonly install_prefix

source "${install_prefix}/lib/osi.sh"
source "${install_prefix}/lib/argparse.sh"

main() {
	local arg_image=
	local arg_qemu=()
	opt_positional() {
		if (( $# < 1 )); then
			argparse:error "Expected at least 1 positional argument, got none"
			return
		fi
		arg_image=$1
		arg_qemu=("${@:2}")
	}
	argparse main "$@"

	case "$opt_mode" in
		error)
			osi.sh:print "Try '%q --help' for more information" "${0##*/}" >&2
			return $EXIT_INVALIDARGUMENT
			;;
		version)
			osi.sh:print "%s (osi-tools) %s" "$NAME" "$VERSION"
			return $EXIT_SUCCESS
			;;
		help)
			osi.sh:print 'Usage: %s [OPTIONS] FILENAME.img [-- QEMU_ARGS...] [< SCRIPT.sh]' "${0##*/}"
			osi.sh:print '   or: %s [OPTIONS] -- FILENAME.img [QEMU_ARGS...] [< SCRIPT.sh]' "${0##*/}"
			osi.sh:print 'Operating System Image: Interactive Shell'
			echo
			osi.sh:print 'OPTIONS:'
			echo "${opt_flaghelp}"
			return $EXIT_SUCCESS
			;;
		main)
			tmp=$(mktemp -td -- "${0##*/}.XXXXXXXXXX")
			trap "rm -rf -- ${tmp@Q}" EXIT

			mkfifo -- "$tmp/sync"

			qemu-system-x86_64 \
			    -machine accel=kvm \
			    -m 512 \
			    -vnc unix:"$tmp/vnc.sock" \
			    -name "osi-shell $arg_image" \
			    -drive media=disk,format=raw,if=virtio,file="$arg_image" \
			    -serial stdio \
			    -serial file:"$tmp/exit" \
			    "${arg_qemu[@]}" \
			    < <(cat <"$tmp/sync" >/dev/null; cat; while sleep 0.1; do printf '\x04'; done) \
			    > >(read -r -N1 c; printf '%s' "$c"; :>"$tmp/sync"; exec cat)

			return "$(sed 's/\r$//' <"$tmp/exit")"
			;;

		*) osi.sh:bug 'unknown opt_mode: %s' "$opt_mode";;
	esac
}

main "$@"