#!/usr/bin/env bash
directory=flex-2.5.37
filename=${directory}.tar.gz
url=http://sourceforge.net/projects/flex/files/${filename}

echo
echo 'INFO: Installing third party library Flex 2.5.37'
echo '------------------------------------------------'
echo

while [[ $# > 1 ]]
do
key="$1"
case $key in
    -j|--num-threads)
    if expr "$2" : '-\?[0-9]\+$' >/dev/null
    then
        MAUS_NUM_THREADS="$2"
    fi
    shift
    ;;
esac
shift
done
if [ -z "$MAUS_NUM_THREADS" ]; then
  MAUS_NUM_THREADS=1
fi

if [ -n "${MAUS_ROOT_DIR+x}" ]; then

    if [ -e "${MAUS_ROOT_DIR}/third_party/source/${filename}" ]
    then
	echo "INFO: Found source archive in 'source' directory"
    else  
	echo "INFO: Source archive doesn't exist.  Downloading..."

	wget --directory-prefix=${MAUS_ROOT_DIR}/third_party/source ${url}

    fi
   
    if [ -e "${MAUS_ROOT_DIR}/third_party/source/${filename}" ]
    then
	echo "INFO: Source archive exists."
	echo
	echo "INFO: Checking MD5 checksum (otherwise the file didn't"
	echo "INFO: download properly):"
	echo
	cd ${MAUS_ROOT_DIR}/third_party/source
	md5sum -c ${filename}.md5 || { echo "FATAL: Failed to download:" >&2; echo "FATAL: ${filename}." >&2; echo "FATAL: MD5 checksum failed.">&2; echo "FATAL: Try rerunning this command to redownload, or check" >&2; echo "FATAL: internet connection"  >&2; rm -f ${filename}; exit 1; }
	sleep 1
	echo
	echo "INFO: Unpacking:"
	echo
	rm -Rf ${MAUS_ROOT_DIR}/third_party/build/${directory}
	sleep 1
	tar xvfz ${MAUS_ROOT_DIR}/third_party/source/${filename} -C ${MAUS_ROOT_DIR}/third_party/build > /dev/null
	cd ${MAUS_ROOT_DIR}/third_party/build/${directory}
	echo "INFO: Configuring:"
	sleep 1
	./configure --prefix ${MAUS_ROOT_DIR}/third_party/install
	echo
	echo "INFO: Making:"
	echo
	sleep 1
	make -j$MAUS_NUM_THREADS
	make install
	            ################################################## 
	echo
        echo "INFO: The package should be locally build now in your"
	echo "INFO: third_party directory, which the rest of MAUS will"
	echo "INFO: find."
    else
	echo "FATAL: Source archive still doesn't exist.  Please file a bug report with your operating system,">&2
	echo "FATAL: distribution, and any other useful information at:" >&2
	echo "FATAL: " >&2
	echo "FATAL: http://micewww.pp.rl.ac.uk:8080/projects/maus/issues/" >&2
	echo "FATAL:" >&2
	echo "FATAL: Giving up, sorry..." >&2
	exit 1
    fi
  
else         ################################################## 
echo
echo "FATAL: MAUS_ROOT_DIR is not set, which is required to" >&2  
echo "FATAL: know where to install this package.  You have two" >&2 
echo "FATAL: options:" >&2
echo "FATAL:" >&2
echo "FATAL: 1. Set the MAUS_ROOT_DIR from the command line by" >&2 
echo "FATAL: (if XXX is the directory where MAUS is installed):" >&2
echo "FATAL:" >&2 
echo "FATAL:        MAUS_ROOT_DIR=XXX ${0}" >&2
echo "FATAL:" >&2
echo "FATAL: 2. Run the './configure' script in the MAUS ROOT" >&2 
echo "FATAL: directory, run 'source env.sh' then rerun this" >&2  
echo "FATAL: command ">&2
exit 1
fi

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