#!/bin/bash

# kf2-srv is a command line tool for managing a set of Killing Floor 2 servers.
# Copyright (C) 2019, 2020 GenZmeY
# mailto: genzmey@gmail.com
# 
# This file is part of kf2-srv.
#
# kf2-srv 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 <https://www.gnu.org/licenses/>.

# WARNING:
# Conversion works correctly for positive A/B for EGS, 
# but still gives incorrect results if there are negative ones

function steamID3_to_steamID64 () # $1: ID3 (A), $2: B
{
	local ID3="$1"
	if [[ -z $2 ]]; then
		local B="$SteamConstB"
	else
		local B="$2"
	fi
	
	# SteamID64=B*2^32+SteamID3
    echo $(($B*(2**32)+$ID3))
}

function steamID64_to_steamID3 () # $1: ID64, $2: B
{
	local ID64="$1"
	if [[ -z $2 ]]; then
		local B="$SteamConstB"
	else
		local B="$2"
	fi
	
	# SteamID3=SteamID64-B*2^32
    echo $(($ID64-$B*(2**32)))
}

function any_to_ID3 () # $1: ID3/ID64/Url
{
	if echo "$1" | grep -qP '^http.+'; then
		local ID64=$(curl -ss "$1/?xml=1" | xmllint --xpath 'string(//steamID64/text())' -)
		local ID3=$(steamID64_to_steamID3 "$ID64") 
	elif [[ $(echo "$1" | wc -m) -eq 18 ]] && echo "$1" | grep -qP '^7656[0-9]+' ; then
		local ID3=$(steamID64_to_steamID3 "$1")
	else
		local ID3="$1"
	fi
	echo "$ID3"
}