#!/bin/sh
#
# Configuration script, to be run before compilation
#
# Author: M. Kirsanov

#
# User-changeable part -------------------------------
#

RELSRCDIR=`dirname $0`
ABSSRCDIR=`cd $RELSRCDIR && pwd`

#LCG platform. Can be needed if external libraries are specified
if [ x$MYLCGPLATFORM = x ]; then
  export MYLCGPLATFORM=x86_64-slc5-gcc43-opt
fi

# Defaults
export COMPMODE=OPT
export SHAREDLIBS=no
export ENABLEGZIP=no
export INSTALLDIR=$ABSSRCDIR
export DATADIR=

for arg in $* ; do
  if [ "x$arg" = "x--enable-debug" ] ; then
    COMPMODE=DBG
  elif [ "x$arg" = "x--enable-shared" ] ; then
    SHAREDLIBS=yes
  elif [ "x$arg" = "x--enable-64bits" ] ; then
    ENABLE64=-m64
  elif [ "x$arg" = "x--enable-gzip" ] ; then
    ENABLEGZIP=yes
  elif [ "x$arg" = "x--help" ] ; then
    echo "Usage: ./configure [options] , where options are:"
    echo "--help                : prints this help"
    echo "--enable-debug        : turns on debugging flags and turns off optimization"
    echo "--enable-shared       : turns on shared library creation (default no)"
    echo "--enable-64bits       : turns on 64 bits compilation flags"
    echo "--lcgplatform=name    : LCG platform name, default is x86_64-slc5-gcc43-opt"
    echo "--installdir=name     : install directory, default is . "
    echo "--prefix=name         : install directory (equivalent to --installdir)"
    echo "--datadir=name        : data directory (for xmldoc), default is install directory"
    echo "--with-hepmc=path     : path to HepMC library to build interface (default is not build)"
    echo "--with-hepmcversion=v : HepMC version (simplified alternative when using CERN AFS LCG external, e.g. =2.06.08)"
    echo "--enable-gzip         : turns on support for reading in gzipped files (default no)"
    echo "                        (experimental feature, see README for more details)"
    echo "--with-boost=path     : path to boost installation (default /usr) (required for gzip support)"
    echo "--with-zlib=path      : path to zlib (default /usr/lib) (required for gzip support)"
    echo
    echo "Use the following environment variables to force the configuration process or add flags:"
    echo "USRCXXFLAGS - to add flags. Use this variable to add -fPIC to the compilation flags for the static libraries"
    echo "USRLDFLAGSSHARED - to add flags to the shared library build command"
    echo "USRSHAREDSUFFIX - to force shared libraries suffix to be like this (default on MacOSX is dylib)"
    echo
    exit
  elif [ x`echo x${arg} | grep "="` != x ] ; then
    option=`echo ${arg} | awk -F = '{print $1}'`
    value=`echo ${arg} | awk -F = '{print $2}'`
    if [ "x${option}" = "x--lcgplatform" ] ; then
      MYLCGPLATFORM=${value}
    elif [ "x${option}" = "x--installdir" ] ; then
      INSTALLDIR=${value}
    elif [ "x${option}" = "x--prefix" ] ; then
      INSTALLDIR=${value}
    elif [ "x${option}" = "x--datadir" ] ; then
      DATADIR=${value}
    elif [ "x${option}" = "x--with-hepmcversion" ] ; then
      HEPMCVERSION=${value}
    elif [ "x${option}" = "x--with-hepmc" ] ; then
      HEPMCLOCATION=${value}
    elif [ "x${option}" = "x--with-boost" ] ; then
      BOOSTLOCATION=${value}
    elif [ "x${option}" = "x--with-zlib" ] ; then
      ZLIBLOCATION=${value}
    else
      echo "${arg}: wrong option. Ignored." >&2
    fi
  fi
done

echo compilation mode is $COMPMODE
echo sharedlibs = $SHAREDLIBS

if [ "x${DATADIR}" = "x" ] ; then
  DATADIR=${INSTALLDIR}
fi

# Environment variables for building HepMC interface library. Note that
# the HepMC interface library is used by the examples main41, main42, ..  .
# Attention: if you have already run these examples and you change HepMC
# version you should reset your LD_LIBRARY_PATH
# The default values here correspond to CERN AFS lcg external
#
if [ "x${HEPMCVERSION}" != "x" ] ; then
  if [ "x${HEPMCLOCATION}" = "x" ] ; then
    export HEPMCLOCATION=/afs/cern.ch/sw/lcg/external/HepMC/${HEPMCVERSION}/${MYLCGPLATFORM}
  fi
fi
#   If you want to assign these variables by hand:
#
#export HEPMCVERSION=2.04.00
#export HEPMCLOCATION=/afs/cern.ch/sw/lcg/external/HepMC/${HEPMCVERSION}/${MYLCGPLATFORM}


if [ "x${HEPMCVERSION}" = "x" ] ; then
  if [ "x${HEPMCLOCATION}" != "x" ] ; then
#                                            try to find out which HepMC version
    export HEPMCVERSION=`grep 'define HEPMC_VERSION' ${HEPMCLOCATION}/include/HepMC/HepMCDefs.h | awk '{print $3}' | tr -d '"'`
  fi
fi
if [ "x${HEPMCVERSION}" != "x" ] ; then
  export HEPMCMAINVERSION=`echo ${HEPMCVERSION} | awk -F . '{print$1}'`
  if [ ${HEPMCMAINVERSION} = 1 ] ; then
    echo "Warning: HepMC 1 cannot be used anymore; Please use HepMC 2"
    echo "         The interface will not be built"
    export HEPMCLOCATION=
  fi
fi
if [ "x${HEPMCLOCATION}" != "x" ] ; then
  if [ "x${HEPMCVERSION}" = "x" ] ; then
    echo "Warning: hepmc specified, but cannot find out which HepMC version"
    echo "Warning: if you specify HepMC 1 the compilation of interface will fail"
  fi
fi


#
# User-changeable part, experts  -----------------------------
#

# Switch off -Wshadow when gzip support is enabled
WSHADOW="-Wshadow"
if [ "x${ENABLEGZIP}" = "xyes" ]; then
  WSHADOW=""
fi

# export FFLAGS_OPT="-O2 -Wuninitialized"
# -Wuninitialized outputs many irrelevant warnings and therefore obscurs
export FFLAGS_OPT="-O2"
export FFLAGS_DBG=-g
export CFLAGS_OPT="-O2"
export CFLAGS_DBG=-g
export CXXFLAGS_OPT="-O2 -ansi -pedantic -W -Wall ${WSHADOW} ${ENABLE64}"
export CXXFLAGS_DBG="-g -ansi -pedantic -W -Wall ${WSHADOW} ${ENABLE64}"
#
# Find platform.
#
export ARCH0="`uname`"
export ARCH=${ARCH0}
export theGcc=`gcc -dumpversion | awk -F . '{print $1}'`
if [ ${theGcc} = 4 ]; then
  export ARCH=${ARCH}-gcc4
fi
echo Platform is $ARCH

#default platform settings:
export FCCOPY=$FC
if [ x$FC = x ]; then
  export FC=g77
fi
if [ x$CC = x ]; then
  export CC=gcc
fi
export FFLAGS="${FFLAGS_OPT}"
export CFLAGS="${CFLAGS_OPT}"
export CXXFLAGS="${CXXFLAGS_OPT}"
export FLIBS="-lfrtbegin -lg2c"
if [ ${COMPMODE} = OPT ]; then
  export FFLAGS="${FFLAGS_OPT}"
  export CFLAGS="${CFLAGS_OPT}"
  export CXXFLAGS="${CXXFLAGS_OPT}"
fi
if [ ${COMPMODE} = DBG ]; then
  export FFLAGS="${FFLAGS_DBG}"
  export CFLAGS="${CFLAGS_DBG}"
  export CXXFLAGS="${CXXFLAGS_DBG}"
fi
LDFLAGSSHARED="${CXXFLAGS} -fPIC -shared"
LDFLAGLIBNAME="-Wl,-soname"
SHAREDSUFFIX=so
if [ $ARCH = Linux ]; then
  if [ x$FCCOPY = x ]; then
    export FC=g77
  fi
  export FFLAGS="${FFLAGS_OPT} -Wno-globals"
  export CFLAGS="${CFLAGS_OPT}"
  export CXXFLAGS="${CXXFLAGS_OPT}"
  export FLIBS="-lfrtbegin -lg2c"
  if [ ${COMPMODE} = OPT ]; then
    export FFLAGS="${FFLAGS_OPT}"
    export CFLAGS="${CFLAGS_OPT}"
    export CXXFLAGS="${CXXFLAGS_OPT}"
  fi
  if [ ${COMPMODE} = DBG ]; then
    export FFLAGS="${FFLAGS_DBG} -Wno-globals"
    export CFLAGS="${CFLAGS_DBG}"
    export CXXFLAGS="${CXXFLAGS_DBG}"
  fi
  LDFLAGSSHARED="${CXXFLAGS} -fPIC -shared"
  LDFLAGLIBNAME="-Wl,-soname"
  SHAREDSUFFIX=so
fi
# Linux platform with gcc4: new Fortran90 compiler.
if [ $ARCH = Linux-gcc4 ]; then
  if [ x$FCCOPY = x ]; then
    export FC=gfortran
  fi
  export FFLAGS="${FFLAGS_OPT}"
  export CFLAGS="${CFLAGS_OPT}"
  export CXXFLAGS="${CXXFLAGS_OPT}"
  export FLIBS="-lgfortran -lgfortranbegin"
  if [ ${COMPMODE} = OPT ]; then
    export FFLAGS="${FFLAGS_OPT}"
    export CFLAGS="${CFLAGS_OPT}"
    export CXXFLAGS="${CXXFLAGS_OPT}"
  fi
  if [ ${COMPMODE} = DBG ]; then
    export FFLAGS="${FFLAGS_DBG}"
    export CFLAGS="${CFLAGS_DBG}"
    export CXXFLAGS="${CXXFLAGS_DBG}"
  fi
  LDFLAGSSHARED="${CXXFLAGS} -fPIC -shared"
  LDFLAGLIBNAME="-Wl,-soname"
  SHAREDSUFFIX=so
fi
# Mac-OSX with gcc4
if [ $ARCH = Darwin-gcc4 ]; then
  if [ x$FCCOPY = x ]; then
    export FC=gfortran
  fi
  export FFLAGS="${FFLAGS_OPT}"
  export CFLAGS="${CFLAGS_OPT}"
  export CXXFLAGS="${CXXFLAGS_OPT}"
  export FLIBS="-lgfortran"
  if [ ${COMPMODE} = OPT ]; then
    export FFLAGS="${FFLAGS_OPT}"
    export CFLAGS="${CFLAGS_OPT}"
    export CXXFLAGS="${CXXFLAGS_OPT}"
  fi
  if [ ${COMPMODE} = DBG ]; then
    export FFLAGS="${FFLAGS_DBG}"
    export CFLAGS="${CFLAGS_DBG}"
    export CXXFLAGS="${CXXFLAGS_DBG}"
  fi
  LDFLAGSSHARED="${CXXFLAGS} -dynamiclib -single_module -flat_namespace -undefined suppress"
  LDFLAGLIBNAME="-Wl,-dylib_install_name"
  SHAREDSUFFIX=dylib
fi
# Mac-OSX with gcc3; is not tested
if [ $ARCH = Darwin ]; then
  if [ x$FCCOPY = x ]; then
    export FC=g77
  fi
  export FFLAGS="${FFLAGS_OPT}"
  export CFLAGS="${CFLAGS_OPT}"
  export CXXFLAGS="${CXXFLAGS_OPT}"
  export FLIBS="-lfrtbegin -lg2c"
  if [ ${COMPMODE} = OPT ]; then
    export FFLAGS="${FFLAGS_OPT}"
    export CFLAGS="${CFLAGS_OPT}"
    export CXXFLAGS="${CXXFLAGS_OPT}"
  fi
  if [ ${COMPMODE} = DBG ]; then
    export FFLAGS="${FFLAGS_DBG}"
    export CFLAGS="${CFLAGS_DBG}"
    export CXXFLAGS="${CXXFLAGS_DBG}"
  fi
  LDFLAGSSHARED="${CXXFLAGS} -dynamiclib -single_module -flat_namespace -undefined suppress"
  LDFLAGLIBNAME="-Wl,-dylib_install_name"
  SHAREDSUFFIX=dylib
fi


CXXFLAGS="${CXXFLAGS} $USRCXXFLAGS"
LDFLAGSSHARED="${LDFLAGSSHARED} $USRLDFLAGSSHARED"
if [ "x${USRSHAREDSUFFIX}" != "x" ] ; then
  SHAREDSUFFIX="${USRSHAREDSUFFIX}"
fi


#Platform & opt/dbg - independent flags and variables:


#
# End of the user-changeable part ---------------------------
#
# Checks
#
if [ $?HEPMCLOCATION ]; then
  if [ x${HEPMCLOCATION} != x ]; then
    if [ ! -d ${HEPMCLOCATION}/include ]; then
      echo "Warning: bad HEPMCLOCATION: directory ${HEPMCLOCATION}/include does not exist"
      echo "         The interface will not be built"
      export HEPMCLOCATION=
    fi
    if [ ! -d ${HEPMCLOCATION}/lib ]; then
      echo "Warning: bad HEPMCLOCATION: directory ${HEPMCLOCATION}/lib does not exist"
      echo "         The interface will not be built"
      export HEPMCLOCATION=
    fi
  fi
fi

# gzip support - do after SHAREDSUFFIX is set
if [ "x${ENABLEGZIP}" = "xyes" ]; then

  # Default locations if none given
  if [ "x${BOOSTLOCATION}" = "x" ]; then
    BOOSTLOCATION=/usr
  fi
  if [ "x${ZLIBLOCATION}" = "x" ]; then
    ZLIBLOCATION=/usr/lib
  fi

  # Check for Boost and zlib
  if [ "x${ENABLEGZIP}" = "xyes" ] ; then
    if [ ! -d "${BOOSTLOCATION}/include/boost/iostreams" ]; then
      echo "Error: cannot find required Boost include files; gzip support disabled"
      ENABLEGZIP=no
    fi

    # Some systems have Boost only under lib64?
    for i in lib lib64; do
      if [ -f "${BOOSTLOCATION}/$i/libboost_iostreams.${SHAREDSUFFIX}" ]; then
        BOOSTLIBLOCATION=${BOOSTLOCATION}/$i
        break
      fi
    done

    if [ "x${ENABLEGZIP}" = "xyes" -a x"${BOOSTLIBLOCATION}" = x ]; then
      echo "Error: cannot find required Boost library files; gzip support disabled"
      ENABLEGZIP=no
    fi

    if [ "x${ENABLEGZIP}" = "xyes" -a ! -f "${ZLIBLOCATION}/libz.${SHAREDSUFFIX}" ]; then
      echo "Error: cannot find zlib; gzip support disabled"
      ENABLEGZIP=no
    fi
  fi

  # Add flags
  if [ "x${ENABLEGZIP}" = "xyes" ] ; then
    echo gzip support is enabled
    CXXFLAGS="${CXXFLAGS} -DGZIPSUPPORT -I${BOOSTLOCATION}/include"
  fi
fi

rm -f config.mk

echo SHELL = /bin/sh > config.mk
echo ARCH = ${ARCH} >> config.mk
echo MYLCGPLATFORM = ${MYLCGPLATFORM} >> config.mk
echo SHAREDLIBS = ${SHAREDLIBS} >> config.mk
echo FC = ${FC} >> config.mk
echo CC = ${CC} >> config.mk
echo FFLAGS = ${FFLAGS} >> config.mk
echo CFLAGS = ${CFLAGS} >> config.mk
echo CXXFLAGS = ${CXXFLAGS} >> config.mk
echo FLIBS = ${FLIBS} >> config.mk
echo LDFLAGSSHARED = ${LDFLAGSSHARED} >> config.mk
echo LDFLAGLIBNAME = ${LDFLAGLIBNAME} >> config.mk
echo SHAREDSUFFIX = ${SHAREDSUFFIX} >> config.mk
echo INSTALLDIR = ${INSTALLDIR} >> config.mk
echo DATADIR = ${DATADIR} >> config.mk
#
if [ x${HEPMCLOCATION} != x ]; then
  if [ x${HEPMCVERSION} != x ]; then
    echo HEPMCVERSION = ${HEPMCVERSION} >> config.mk
  fi
  echo HEPMCLOCATION = ${HEPMCLOCATION} >> config.mk
fi
#
#
#
rm -f examples/config.sh
rm -f examples/config.csh
if [ x${HEPMCLOCATION} != x ]; then
  if [ $ARCH0 != Darwin ]; then
    echo "#!/bin/csh" > examples/config.csh
    echo 'if( ! $?LD_LIBRARY_PATH ) then' >> examples/config.csh
    echo "  setenv LD_LIBRARY_PATH ${HEPMCLOCATION}/lib" >> examples/config.csh
    echo "else" >> examples/config.csh
    echo "  setenv LD_LIBRARY_PATH" '${LD_LIBRARY_PATH}'":${HEPMCLOCATION}/lib" >> examples/config.csh
    echo "endif" >> examples/config.csh
    echo "#!/bin/sh" > examples/config.sh
    echo 'if [ ! $?LD_LIBRARY_PATH ]; then' >> examples/config.sh
    echo "  export LD_LIBRARY_PATH=${HEPMCLOCATION}/lib" >> examples/config.sh
    echo fi >> examples/config.sh
    echo 'if [ $?LD_LIBRARY_PATH ]; then' >> examples/config.sh
    echo "  export LD_LIBRARY_PATH="'${LD_LIBRARY_PATH}'":${HEPMCLOCATION}/lib" >> examples/config.sh
    echo fi >> examples/config.sh
  else
    echo "#!/bin/csh" > examples/config.csh
    echo 'if( ! $?DYLD_LIBRARY_PATH ) then' >> examples/config.csh
    echo "  setenv DYLD_LIBRARY_PATH ${HEPMCLOCATION}/lib" >> examples/config.csh
    echo "else" >> examples/config.csh
    echo "  setenv DYLD_LIBRARY_PATH" '${DYLD_LIBRARY_PATH}'":${HEPMCLOCATION}/lib" >> examples/config.csh
    echo "endif" >> examples/config.csh
    echo "#!/bin/sh" > examples/config.sh
    echo 'if [ ! $?DYLD_LIBRARY_PATH ]; then' >> examples/config.sh
    echo "  export DYLD_LIBRARY_PATH=${HEPMCLOCATION}/lib" >> examples/config.sh
    echo fi >> examples/config.sh
    echo 'if [ $?DYLD_LIBRARY_PATH ]; then' >> examples/config.sh
    echo "  export DYLD_LIBRARY_PATH="'${DYLD_LIBRARY_PATH}'":${HEPMCLOCATION}/lib" >> examples/config.sh
    echo fi >> examples/config.sh
  fi
fi

# gzip support - write locations into config.mk
if [ "x${ENABLEGZIP}" = "xyes" ] ; then
  echo "ENABLEGZIP = yes" >> config.mk
  echo "BOOSTLOCATION = ${BOOSTLOCATION}" >> config.mk
  echo "BOOSTLIBLOCATION = ${BOOSTLIBLOCATION}" >> config.mk
  echo "ZLIBLOCATION = ${ZLIBLOCATION}" >> config.mk
fi

# Substitute into pythia8-config script
mkdir -p bin
sed -e "s:@prefix@:$INSTALLDIR:" -e "s:@datadir@:$DATADIR:" \
    -e "s:@HEPMCPATH@:$HEPMCLOCATION:" \
    -e "s:@ENABLEGZIP@:$ENABLEGZIP:" \
    -e "s:@ZLIBPATH@:$ZLIBLOCATION:" \
    -e "s:@BOOSTINCPATH@:$BOOSTLOCATION:" \
    -e "s:@BOOSTLIBPATH@:$BOOSTLIBLOCATION:" \
    pythia8-config.in > bin/pythia8-config
chmod +x bin/pythia8-config