if ! . ./CONFIG ; then
  echo "Error sourcing configuration file CONFIG" >&2
  exit 1
fi

# allow overriding via command line
if [ -n "$1" ] ; then
  version="$1"
fi

echo "Using selenium version $version (override via file CONFIG)"

if [ -n "$version" ] ; then
  jar="selenium-server-standalone-${version}.jar"
else
  echo "Error: \$version is unset." >&2
  exit 1
fi

create_symlink() {
  ln -sf "$jar" selenium-server.jar
}

if [ -r "$jar" ] ; then
  echo "File $jar exists already, nothing to do."
  create_symlink
  exit 0
fi

echo "Downloading $jar (might take a while...)"
if wget --no-verbose -O "$jar" "http://selenium.googlecode.com/files/${jar}" ; then
  echo OK
else
  echo "ERROR" >&2
  exit 1
fi

if ! test -s "$jar" ; then
  echo "Empty $jar file." >&2
  exit 1
fi

create_symlink