#!/bin/bash
#	g4bldata - manage Geant4 data for G4beamline
#
#	The Geant4 data is searched for in two places:
#		$G4BL_DIR/Geant4Data
#		$HOME/Geant4Data
#	--install will run the Java program G4blData, which searches in the
#	same two places.
#
#	USAGE: g4bldata [--check] [--setenv] [--install] [--echo]
#
#	--check    check for the presence of the environment variables or
#	           the $G4BL_DIR/Geant4Data directory; If present, a short
#	           message is written to stdout; if neither is present, a
#	           description of how to obtain the data is printed.
#
#	--setenv   ensure the environment variables are set up, print an
#	           errormessage if the data are not found.
#	           MUST be source-d. Does g4bldata --echo.
#
#	--install  download and unpack the data, and create a setup script
#	           that sets up the environment variables.
#
#	--install-no-gui as install, but without GUI. Requires wget.
#
#	--echo     echo the data environment variables to stdout (name=value\n)
#
#	Otherwise, a short usage message is printed.

# determine G4BL_DIR
if test "$G4BL_DIR" = ""
then
	G4BL_DIR=`dirname "$0"`
	G4BL_DIR=`\cd "$G4BL_DIR" >&- 2>&- && pwd`
	G4BL_DIR=`dirname "$G4BL_DIR"`
	if test -x /bin/cygpath
	then
		G4BL_DIR=`/bin/cygpath -m "$G4BL_DIR"`
	fi
fi
export G4BL_DIR
if test ! -r "$G4BL_DIR/bin/g4bldata"
then
	echo "g4bldata: ERROR -- cannot determine G4BL_DIR."
	echo "          This script must be run via an absolute path."
	exit 1
fi

# check for environment variables
ENV_OK=false
if test "$G4LEDATA " -a "$G4LEVELGAMMADATA"
then
	ENV_OK=true
fi

if test "$1" = "--echo"
then
	if ! $ENV_OK
	then
		if test -r "$G4BL_DIR/Geant4Data/setup.sh"
		then
			source "$G4BL_DIR/Geant4Data"/setup.sh
		elif test -r "$HOME/Geant4Data/setup.sh"
		then
			source "$HOME/Geant4Data/setup.sh"
		else
			echo >&2 "g4bldata: ERROR -- cannot find Geant4Data."
			exit 1
		fi
	fi
	if test "$G4ABLADATA"; then echo G4ABLADATA=$G4ABLADATA; fi
	if test "$G4LEDATA"; then echo G4LEDATA=$G4LEDATA; fi
	if test "$G4NEUTRONHPDATA"; then echo G4NEUTRONHPDATA=$G4NEUTRONHPDATA; fi
	if test "$G4NEUTRONXSDATA"; then echo G4NEUTRONXSDATA=$G4NEUTRONXSDATA; fi
	if test "$G4PIIDATA"; then echo G4PIIDATA=$G4PIIDATA; fi
	if test "$G4LEVELGAMMADATA"; then echo G4LEVELGAMMADATA=$G4LEVELGAMMADATA; fi
	if test "$G4RADIOACTIVEDATA"; then echo G4RADIOACTIVEDATA=$G4RADIOACTIVEDATA; fi
	if test "$G4REALSURFACEDATA"; then echo G4REALSURFACEDATA=$G4REALSURFACEDATA; fi
	exit 0
fi

if test "$1" = "--check"
then
	if $ENV_OK
	then
	    echo "g4bldata: The Geant4 data environment variables are set."
	    echo "          They must remain set whenever G4beamline is run."
	    exit 0
	fi
	if test -d "$G4BL_DIR/Geant4Data" -o -d "$HOME/Geant4Data"
	then
	    echo "g4bldata: The Geant4Data directory is present."
	    echo "          This instance of G4beamline will find the data."
	    exit 0
	fi
	cat <<!
g4bldata: ERROR -- no Geant4 data found. These data are required.

You can obtain the Geant4 data in several ways:
  * Run "g4bldata --install"  to download and install the data.
    This is generally the easiest.
  * Copy or Link the Geant4Data directory from another installation into
    this one.
  * If the Geant4Data are already installed, ensure that the Geant4 data
    environment variables are set whenever G4beamline is run.
The Geant4Data directory requires about 400 MegaBytes download from CERN, and
takes about 1.5 GigaBytes after unpacking.
!
	exit 1
fi

if test "$1" = "--setenv"
then
	if $ENV_OK; then $G4BL_DIR/bin/g4bldata --echo; return 0; fi
	if test -r "$G4BL_DIR/Geant4Data/setup.sh"
	then
		source "$G4BL_DIR/Geant4Data/setup.sh"
		$G4BL_DIR/bin/g4bldata --echo
		return 0
	elif test -r "$HOME/Geant4Data/setup.sh"
	then
		source "$HOME/Geant4Data/setup.sh"
		$G4BL_DIR/bin/g4bldata --echo
		return 0
	fi
	echo >&2 "g4bldata: ERROR -- cannot find Geant4Data."
	return 1
fi

if test "$1" = "--install"
then
	case `uname -s` in
	Darwin*) 
	    JAVAOPTS="-Xdock:icon=$G4BL_DIR/share/g4beamline/G4blDataIcon.icns"
	    ;;
	*)  JAVAOPTS=''
	    ;;
	esac
	java $JAVAOPTS -classpath $G4BL_DIR/share/g4beamline G4blData
	exit
fi

echo "g4bldata: ERROR -- invalid argument."
echo "USAGE: g4bldata [--echo] [--check] [--setenv] [--install]"
echo "       --echo will echo the Geant4 environment variables to stdout."
echo "       --check will check for the presence of the data."
echo "       --setenv will set up the environment data, MUST be source-d."
echo "       --install will install the data; 400 MB download, 1.5GB on disk."
exit 1