group=org.gcube.core
artifact=common-smartgears
repo=gcube-releases

function showhelp {
  			   echo -e "\nusage:  download [-v <version>] [-s|-h] \n" 
               echo    "  <version>          = the version to download."
               echo    "                     = By default, this is the latest known version."
			   echo    "  s                  = download a snapshot version."
			   echo    "  x                  = dry run."
		       echo -e "  h                  = shows this help.\n"
}

while getopts ":v:sh" opt; do
  case $opt in
	v) version=$OPTARG;;
	s) repo=gcube-snapshots;;
    h) showhelp
       exit 0 ;;
	:)  echo -e "\nERROR:option -$OPTARG requires an argument." >&2 ; 
				showhelp; 
				echo -e "\naborting.\n"
				exit 1;;
	\?) echo -e "\nERROR:invalid option: -$OPTARG"; 
			showhelp; 
			echo -e "\naborting.\n" 
			exit 1 >&2 ;;
  esac
done

#######find latest version in target repo. could use LATEST but would not know how to reflect version in file name


version_regexp=".*<baseVersion>\(.*\)</baseVersion>.*" 


if [ -z "$version" ]; then 
	version=`curl -silent -L "maven.research-infrastructures.eu/nexus/service/local/artifact/maven/resolve?r=$repo&g=$group&a=$artifact&v=LATEST&e=tar.gz&c=distro" \
		| grep "$version_regexp" | sed "s|$version_regexp|\1|"` #(first extract matching line, then extract matching group)
		
		if [ -z "$version" ]; then 
			echo -e "\nERROR: cannot find a version to download in $repo." >&2
			echo -e "\naborting.\n"
			exit 1
		fi
fi



echo -e "\ndownloading common-smartgears-$version.tar.gz...\c" 


http_code=`curl -s -o "common-smartgears-$version.tar.gz" -w "%{http_code}" -L "maven.research-infrastructures.eu/nexus/service/local/artifact/maven/redirect?r=$repo&g=$group&a=$artifact&v=$version&e=tar.gz&c=distro"`

if [ ! "$http_code" = "200" ]; then 
	echo -e "\n\nERROR: cannot download version $version from $repo." >&2
	echo -e "\naborting.\n"
	rm "common-smartgears-$version.tar.gz"
	exit 1
fi
                         
echo -e "done.\n"