# Program entry point
#
# Copyright (C) 2015  Patrick "P. J." McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -u

usage()
{
	printf 'Usage: %s [option ...] <action>\n' "${0}"
}

help()
{
	usage
	cat <<EOF

Options:
  -h            Display this information
  -V            Display version information
  -i {cli|tui}  Select either a textual user interface or a command line
                interface (default: cli)
  -m <message>  Show <message> in the user interface
  -o <file>     Log output to <file>

Actions:
  update        Update firmware
EOF
}

version()
{
	cat <<EOF
firman ${PACKAGE_VERSION}
Copyright (C) 2015  Patrick "P. J." McDermott
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
EOF
}

main()
{
	local opt=
	local ui='cli'
	local msg=''
	local action=

	unset OPTARG
	while getopts 'hVi:m:o:' opt; do
		case "${opt}" in
			'h')
				help
				exit
				;;
			'V')
				version
				exit
				;;
			'i')
				ui="${OPTARG}"
				;;
			'm')
				msg="${OPTARG}"
				;;
			'o')
				log_init "${OPTARG}"
				;;
		esac
		unset OPTARG
	done
	shift $(($OPTIND - 1))

	if [ ${#} -ne 1 ]; then
		usage >&2
		exit 1
	fi
	action="${1}"

	case "${action}" in
		'update');;
		*)
			usage >&2
			exit 1
	esac

	if ! init_ui "${ui}"; then
		exit 1
	fi
	if [ "x${msg}" != 'x' ]; then
		message "${msg}"
	fi
	srand $(expr ${$} + $(date '+%s'))
	init_temp_dir

	case "${action}" in
		'update')
			do_update
			;;
	esac

	info 'Exiting'

	fini_temp_dir
	exit_ui

	return 0
}