#!/bin/sh

#
# Copyright (c) 2019-2021, mord0d and their slaves
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

VERSION="0.6"
PROGNAME="gamelib"

arch="$(uname -m)"
uid="$(id -u)"
gid="$(id -g)"

: ${TMPDIR:=/tmp}
: ${GAMELIB_DEBUG:=0}

LOCKFILE="${TMPDIR}/.${PROGNAME}-${uid}.lock"
TEMPDIR="${TMPDIR}/.${PROGNAME}-${uid}"

# gl_log {{{
gl_log() {
	local lvl="${1}"
	shift
	if [ "${lvl}" = "FTL" ] || [ "${GAMELIB_DEBUG}" -ne 0 ] || [ -z "${LOGFILE}" -o ! -w "${LOGFILE}" ]; then
		echo "[${lvl}] ${*}" >&2
	fi
	echo "[${lvl}:${$}] $(date -j '+%Y-%m-%d %H:%M:%S') ${*}" >> "${LOGFILE:=/dev/null}"
}
# }}}

gl_run() {
}
gl_edit() {
}
gl_upgrade() {
}
gl_rollback() {
}
gl_usage() {
}

# gl_version {{{
gl_version() {
	echo "${PROGNAME} ${VERSION}"
}
# }}}

# gl_license {{{
gl_license() {
	sed -n 's/^# //; s/^#$//; 4,25p' "${0}"
}
# }}}

gl_list() {
}

game=''
subcommands=''
upgrade=0
rollback=0
edit=0

while :; do
	case "${1}" in
		('') break ;;
		(-h|--help) gl_usage; exit 0 ;;
		(-V|--version) gl_version; exit 0 ;;
		(-L|--license) gl_license; exit 0 ;;
		(-l|--list) gl_list; exit 0 ;;
		(-v|--verbose) GAMELIB_DEBUG=1; shift ;;
		(-u|--upgrade) upgrade=1; rollback=0; shift ;;
		(-b|--rollback) rollback=1; upgrade=0; shift ;;
		(-r|--run) shift; subcommands="${subcommands} ${1}"; shift ;;
		(-e|--edit) edit=1; shift ;;
		(-w|--workdir) shift; GAMELIB_GAMES_DIR="${1}"; shift ;;
		(-*) gl_log ERR "Unknown option \"${1}\"!"; exit 1 ;;
		(*) game="${1}"; shift ;;
	esac
done

if [ -z "${GAMELIB_GAMES_DIR}" ]; then
	gl_log FTL "\"\$GAMELIB_GAMES_DIR\" is not defined!"
	exit 1
fi
if [ ! -d "${GAMELIB_GAMES_DIR}" ]; then
	gl_log FTL "\"\$GAMELIB_GAMES_DIR\" is not a directory"
	exit 1
fi

if [ -z "${game}" ]; then
	gl_log FTL "No game specified!"
	gl_list
	exit 1
fi

if [ ${edit} -eq 1 ]; then
	gl_edit "${game}"
	exit ${?}
fi

if [ ${upgrade} -eq 1 ]; then
	gl_upgrade "${game}"
elif [ ${rollback} -eq 1 ]; then
	gl_rollback "${game}"
else
	gl_run "${game}" "${subcommands}"
fi