#!/bin/bash
#
# Removes an item from the inventory
#
#   Copyright (C) 2011 Mike Gerwitz
#
#   This file is part of gsgp. 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/>.
##

mypath=$( dirname $0 )

. "$mypath/common-inv"

if [ $# -lt 1 ]; then
    echo "Usage: $0 ITEM"
fi

item_id="$1"
inv_item_file="$( $mypath/getinvpath )/$item_id"
count=$( "$mypath/inv-count" $item_id )

# can't remove an item that's not in the inventory
if [ $count -eq 0 ]; then
    echo "$item_id: not in inventory" >&2
    exit 1
fi

# remove an item from the item inventory
sed -i '1d' "$inv_item_file"

# if all the items have been removed, then remove the file to speed up inventory
# scanning and to keep the filesystem clean
(( count-- ))
if [ $count -eq 0 ]; then
    rm "$inv_item_file"
fi