#!/usr/bin/env bash

BIN_DIR=/usr/lib/iortcw
DATA_DIR=
MOUNT_DIR=${HOME}/.iortcw
SAVE_DIR=${HOME}/.local/iortcw

UMOUNT_ON_EXIT=1
UFS_OPTIONS=

# Load config if exists
_CONF="${IORTCW_CONFIG:=${HOME}/.config/iortcw.conf}"
test -f $_CONF && source $_CONF

_help() {
	echo "iortcw [--help|help|cfg|ded|mp|sp]"
	echo ""
	echo "--help/help: 		Print this help"
	echo "cfg: 			Print config"
	echo "ded: 			Launch dedicated server"
	echo "mp: 			Launch multiplayer client"
	echo "sp: 			Launch singleplayer client (default)"
	echo ""
	echo "Config location under ${_CONF}"
	echo "Set DATA_DIR to game folder or launch directly from it"
	echo ""
	echo "IORTCW_CONFIG environment variable can be used for a different config location"
}

_print_config() {
	echo "# --- CONFIG --- "
	echo "# Base directory of game files"
	echo "DATA_DIR=\"${DATA_DIR}\""
	echo ""
	echo "# Directory of executables (changing not recommended)"
	echo "BIN_DIR=\"${BIN_DIR}\""
	echo ""
	echo "# Directory where unionfs mounts"
	echo "# WARNING: DO NOT SET THIS TO THE SAME AS OTHER DIRECTORIES!"
	echo "MOUNT_DIR=\"${MOUNT_DIR}\""
	echo ""
	echo "# If set saves all changes (saves, configs, etc) here instead of the data directory"
	echo "SAVE_DIR=\"${SAVE_DIR}\""
	echo ""
	echo "# If set unmounts the unionfs after game exists"
	echo "UMOUNT_ON_EXIT=${UMOUNT_ON_EXIT}"
	echo ""
	echo "# Custom options for unionfs"
	echo "UFS_OPTIONS=\"${UFS_OPTIONS}\""
}

die() { echo "$*" 1>&2 ; exit 1; }

case $1 in
	--help) 
		_help
		exit
		;;
	help) 
		_help
		exit
		;;
	cfg)
		_print_config
		exit
		;;
	ded) _BIN=iowolfded ;;
	mp) _BIN=iowolfmp ;;
	sp) _BIN=iowolfsp ;;
	*) _BIN=iowolfsp ;;
esac

test -n "${DATA_DIR}" || DATA_DIR="$(pwd)"

test -f "${DATA_DIR}/Main/pak0.pk3" || test -f "${DATA_DIR}/main/pak0.pk3" || die "Game not found in ${DATA_DIR}!"

if ! [ -e "${DATA_DIR}/main" ] ; then
	pushd "${DATA_DIR}"
	ln -s Main main
	popd
fi

if [ -f "/usr/bin/unionfs" ] && ! [ -e "${MOUNT_DIR}/.mounted" ] ; then
	test -d "${MOUNT_DIR}" || mkdir -p "${MOUNT_DIR}"

	if [ -n "${SAVE_DIR}" ] ; then
		test -d "${SAVE_DIR}" || mkdir -p "${SAVE_DIR}"
		unionfs ${UFS_OPTIONS} "${SAVE_DIR}=RW:${DATA_DIR}:${BIN_DIR}" "${MOUNT_DIR}"
	else
		unionfs ${UFS_OPTIONS} "${DATA_DIR}=RW:${BIN_DIR}" "${MOUNT_DIR}"
	fi

	touch "${MOUNT_DIR}/.mounted"
fi

pushd "${MOUNT_DIR}"
./${_BIN} $@
popd

if [ -n ${UMOUNT_ON_EXIT} ] ; then
	rm "${MOUNT_DIR}/.mounted"
	umount "${MOUNT_DIR}"
fi