#!/bin/bash

set -e

if [ "x${1}" = "x" ] ; then
        printf "Usage bumpversion major|minor|micro|set|init\n"
        exit 2
fi
cmd="${1}"
if [ "${cmd}" = "set" -a "x${2}" = "x" ] ;then
        printf "ERROR the 'set' command requires a version argument\n"
        exit 2
fi

if [ "${cmd}" != "init" -a ! -f ./VERSION ] ; then
        printf "ERROR this script must be executed from the repo base directory "
	printf "where the VERSION file is located.\n"
        exit 2
fi
if [ "${cmd}" != "init" ] ; then
	PRIOR_VERSION=$(cat VERSION|head -n 1|tr -d "\r\n")
	printf "INFO Current build version ${VERSION}\n"
	IFS=. read -r VERSION_MAJOR VERSION_MINOR VERSION_MICRO <<< ${PRIOR_VERSION}
	if [ "x${VERSION_MAJOR}" = "x" -o "x${VERSION_MINOR}" = "x" -o "x${VERSION_MICRO}" = "x" ] ; then
		printf "ERROR the VERSION file has not been initialized.\n"
	        exit 2
	fi
else
	printf "INFO Initializing build version\n"
fi
case ${1} in 
	major)
		((++VERSION_MAJOR))
		VERSION_MINOR=0
		VERSION_MICRO=0
		;;
	minor)
		((++VERSION_MINOR))
		VERSION_MICRO=0
		;;
	micro)
		((++VERSION_MICRO))
		;;
	set)
		IFS=. read -r VERSION_MAJOR VERSION_MINOR VERSION_MICRO <<< ${2}
		;;
	init)
		VERSION_MAJOR=0
		VERSION_MINOR=1
		VERSION_MICRO=0
		;;
	default)
		printf "ERROR An invalid command argument was provided\n"
	        exit 2
		;;
esac
VERSION="${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_MICRO}"
printf "${VERSION}\n" >VERSION
printf "INFO New build version ${VERSION}\n"
exit 0