dnl
dnl Process this file with autoconf-2.3 (and greater) to produce a
dnl configure script.
dnl

dnl
dnl Initialize, check autoconf version and add our bin directory to
dnl those autoconf will search for binaries.
dnl

echo "starting MWRANK configuration ..."

AC_INIT()
AC_PREREQ(2.3)

dnl
dnl Checks for the C++ compiler.
dnl

AC_PROG_CC
AC_PROG_CPP
AC_PROG_CXX

dnl
dnl Checks for ranlib. Use echo if we don't have ranlib. 
dnl

AC_CHECK_PROG(RANLIB, ranlib, ranlib)
if test -z "$RANLIB" ; then
  RANLIB="echo"
fi
AC_SUBST(RANLIB)

dnl
dnl Checks for libraries libm.a, libstdc++.a
dnl

warn_missing_library()
{
  if test "$1" = "no" ; then
    echo "configure:: warning:: missing lib$2.a. Linking programs may"
    echo "                      not work! In case of problems, please"
    echo "                      install \"lib$2.a\" and recompile."
  fi
}

AC_CHECK_LIB(m, main, M_LIB="-lm",M_LIB="")
warn_missing_library $ac_cv_lib_m_main m
AC_SUBST(M_LIB)

AC_CHECK_LIB(g++, main, GXX_LIB="-lg++",GXX_LIB="")
warn_missing_library $ac_cv_lib_g++_main g++
AC_SUBST(GXX_LIB)

AC_CHECK_LIB(stdc++, main, STDCXX_LIB="-lstdc++",STDCXX_LIB="")
warn_missing_library $ac_cv_lib_stdc++_main stdc++
AC_SUBST(STDCXX_LIB)

dnl
dnl Checks for library function times
dnl

AC_CHECK_FUNCS(times)

dnl
dnl Checks for canonical host name.
dnl

AC_CANONICAL_HOST

dnl
dnl Get CPU name for the installation procedure. 
dnl
ARCH="$host_cpu-$host_vendor-$host_os"
AC_SUBST(ARCH)

dnl
dnl Ask for the usage of the LiDIA library
dnl

echo " "
echo "You will be now asked for some additional information to"
echo "complete the configuration on your system. To most of the"
echo "following questions you can reply by simply typing a cha-"
echo "racter followed by RETURN."

YES="y"
NO="n"
DONE=$NO

while test $DONE != $YES;
do
  echo " "
  echo "Do you want to use the LiDIA library (y/n) ? "
  read ANSWER
  if test $ANSWER = $YES -o $ANSWER = $NO; then
    USER_ANSWER=$ANSWER
    DONE=$YES
  else
    echo "Please enter y for YES and n for NO."
  fi
done

if test $USER_ANSWER = $YES ; then
  PURE_MODE=1 
  MIXED_MODE=2 
  DONE=$NO

  echo " "
  echo "You can compile the MWRANK program using LiDIA in two different modes"
  echo " "
  echo "1 - pure  mode: uses LiDIA bigints, bigrationals and bigfloats"
  echo "2 - mixed mode: uses LiDIA bigints, bigrationals and doubles"

  while test $DONE != $YES;
  do
    echo " "
    echo "Which mode do you prefer (1/2) ? "
    read ANSWER
    if test $ANSWER = $PURE_MODE -o $ANSWER = $MIXED_MODE; then
      USER_ANSWER=$ANSWER
      DONE=$YES
    else
      echo "Please enter 1 for pure mode and 2 for mixed mode."
    fi
   done
   COMPILE=$USER_ANSWER

  echo " "
  echo "As the last action, you have to enter the paths to the directories"
  echo "containing LiDIA's include files and library for the architecture"
  echo " "
  echo "              $ARCH"
  echo " "

  DONE=$NO

  while test $DONE != $YES ;
  do
    echo " "
    echo "Enter the path to the directory contaning LiDIA's include files";
    read LIDIAINCDIR
    if test -d $LIDIAINCDIR ; then
      if test -d $LIDIAINCDIR/LiDIA ; then
        DONE=$YES
      else
        echo "There is no LiDIA subdirectory in $LIDIAINCDIR!"
      fi
    else
      echo "$LIDIAINCDIR is not a valid directory!"
    fi
  done
 

  DONE=$NO

  while test $DONE != $YES ;
  do
    echo " "
    echo "Enter the path to the directory contaning LiDIA's library";
    read LIDIALIBDIR
    if test -d $LIDIALIBDIR ; then
      if test -f $LIDIALIBDIR/libLiDIA.a ; then
        DONE=$YES
      else
        echo "There is no libLiDIA.a in $LIDIALIBDIR!"
      fi
    else
      echo "$LIDIALIBDIR is not a valid directory!"
    fi
  done
 
 AC_SUBST(LIDIAINCDIR)
 AC_SUBST(LIDIALIBDIR)
else

  DONE=$NO
while test $DONE != $YES;
do
  echo " "
  echo "Do you want to use NTL (y/n) ? "
  read ANSWER
  if test $ANSWER = $YES -o $ANSWER = $NO; then
    USER_ANSWER=$ANSWER
    DONE=$YES
  else
    echo "Please enter y for YES and n for NO."
  fi
done
if test $USER_ANSWER = $YES ; then
   COMPILE=3
echo " "
echo "The NTL include files and library are expected to be in "
echo "standard places, e.g. /usr/local/include for NTL/*.h and "
echo "/usr/local/lib for libntl.a"
echo "If not, manually edit the Makefile!"

  DONE=$NO

  while test $DONE != $YES ;
  do
    NTLINCDIR=/usr/local/include
    echo " "
    if test -d $NTLINCDIR ; then
      if test -d $NTLINCDIR/NTL ; then
        DONE=$YES
      else
        echo "There is no NTL subdirectory in $NTLINCDIR!"
      fi
    else
      echo "$NTLINCDIR is not a valid directory!"
    fi
  done
 

  DONE=$NO

  while test $DONE != $YES ;
  do
    echo " "
    NTLLIBDIR=/usr/local/lib
    if test -d $NTLLIBDIR ; then
      if test -f $NTLLIBDIR/libntl.a ; then
        DONE=$YES
      else
        echo "There is no libntl.a in $NTLLIBDIR!"
      fi
    else
      echo "$NTLLIBDIR is not a valid directory!"
    fi
  done

else
   COMPILE=0
fi
fi
echo " "
AC_SUBST(COMPILE)

dnl
dnl Creates the makefiles and the configuration files.
dnl

AC_CONFIG_HEADER(config.h)
AC_OUTPUT(Makefile)