#! /usr/bin/env bash
#
#

look_for_makedepend()  {

    #  The "original" makedepend is part of the Imake system that is
    #  most often distributed with XFree86 or with an XFree86 source
    #  package.  As a result, many machines (eg. generic Linux) do not
    #  have a system-default "makedepend" available.  For those
    #  systems, we have two fall-back options:
    #
    #    1) a makedepend implementation shipped with the cyrus-imapd
    #       package:  ftp://ftp.andrew.cmu.edu/pub/cyrus-mail/
    #
    #    2) a known-buggy xmakedpend shell script
    #
    #  So the choices are, in order:
    #
    #    1) use the user-specified program
    #    2) use a system-wide default
    #    3) locally build and use the cyrus implementation
    #    4) fall back to the buggy local xmakedpend script
    #
    if test "x${MAKEDEPEND}" = x ; then
	which makedepend > /dev/null 2>&1
	RV0=$?
	cat <<EOF >> genmake_tc.f
      program test
      write(*,*) 'test'
      stop
      end
EOF
	makedepend genmake_tc.f > /dev/null 2>&1
	RV1=$?
	if test "x${RV0}${RV1}" = x00 ; then
	    MAKEDEPEND=makedepend
	else
	    echo "    a system-default makedepend was not found."
	    
	    #  Try to build the cyrus implementation
	    build_cyrus_makedepend
	    RETVAL=$?
	    if test "x$RETVAL" != x0 ; then
		MAKEDEPEND='$(TOOLSDIR)/xmakedepend'
	    fi
	    rm -f ./genmake_cy_md
	fi
    else
	#  echo "MAKEDEPEND=${MAKEDEPEND}"
	echo "${MAKEDEPEND}" | grep -i cyrus > /dev/null 2>&1
	RETVAL=$?
	if test x"$RETVAL" = x0 ; then
	    build_cyrus_makedepend
	fi
    fi
}


build_cyrus_makedepend()  {
    rm -f ./genmake_cy_md
    (
	cd $ROOTDIR/tools/cyrus-imapd-makedepend  \
	    &&  ./configure > /dev/null 2>&1  \
	    &&  make > /dev/null 2>&1
	if test -x ./makedepend.exe ; then
	    $LN ./makedepend.exe ./makedepend
	fi
	./makedepend ifparser.c > /dev/null 2>&1  \
	    &&  echo "true"
    ) > ./genmake_cy_md
    grep true ./genmake_cy_md > /dev/null 2>&1
    RETVAL=$?
    rm -f ./genmake_cy_md
    if test "x$RETVAL" = x0 ; then
	MAKEDEPEND='$(TOOLSDIR)/cyrus-imapd-makedepend/makedepend'
	return 0
    else
	echo "WARNING: unable to build cyrus-imapd-makedepend"
	return 1
    fi
}


find_possible_configs()  {

    tmp1=`uname`"_"`uname -m`
    tmp2=`echo $tmp1 | sed -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
    tmp3=`echo $tmp2 | sed -e 's/power macintosh/ppc/'`
    tmp1=`echo $tmp3 | sed -e 's|x86_64|amd64|'`
    tmp2=`echo $tmp1 | sed -e 's/i[3-6]86/ia32/' | sed -e 's/athlon/ia32/'`
    tmp3=`echo $tmp2 | sed -e 's/cray sv1/craysv1/'`
    PLATFORM=$tmp3
    echo $PLATFORM | grep cygwin > /dev/null 2>&1  &&  PLATFORM=cygwin_ia32
    OFLIST=`(cd $ROOTDIR/tools/build_options; ls | grep "^$PLATFORM")`
    echo "  The platform appears to be:  $PLATFORM"
    
    echo "test" > test
    ln -s ./test link
    RETVAL=$?
    if test "x${RETVAL}" = x0 ; then
	LN="ln -s"
    else
	echo "Error: \"ln -s\" does not appear to work on this system!"
	echo "  For help, please contact <MITgcm-support@mitgcm.org>."
	exit 1
    fi
    rm -f test link

    if test "x$CPP" = x ; then
	CPP="cpp -traditional -P"
    fi

    look_for_makedepend

    #================================================================
    #  look for possible C compilers
    tmp="$MITGCM_CC $CC gcc c89 cc c99 mpicc"
    p_CC=
    for c in $tmp ; do
	rm -f ./genmake_hello.c  ./genmake_hello
	cat >> genmake_hello.c << EOF
#include <stdio.h>
int main(int argc, char **argv) {
  printf("Hello!\n");
  return 0;
}
EOF
	$c -o genmake_hello genmake_hello.c > /dev/null 2>&1
	RETVAL=$?
	if test "x${RETVAL}" = x0 ; then
	    p_CC="$p_CC $c"
	fi
    done
    rm -f ./genmake_hello.c ./genmake_hello
    if test "x${p_CC}" = x ; then
	cat 1>&2 <<EOF

Error: No C compilers were found in your path.  Please specify one using:

    1) an "optfile" on (eg. "-optfile=path/to/OPTFILE"),
    2) the CC or MITGCM_CC environment variables.

EOF
	exit 1
    else
	echo "  The possible C compilers found in your path are:"
	echo "   "$p_CC
	if test "x$CC" = x ; then
	    CC=`echo $p_CC | $AWK '{print $1}'`
	    echo "  Setting C compiler to: "$CC
	fi
    fi

    #================================================================
    #  look for possible FORTRAN compilers
    tmp="$MITGCM_FC $FC efc g77 f77 pgf77 pgf95 ifc f90 f95 mpif77 mpf77 mpxlf95"
    p_FC=
    for c in $tmp ; do
	rm -f ./hello.f ./hello
	cat >> hello.f <<EOF
      program hello
      do i=1,3
        print *, 'hello world : ', i
      enddo
      end
EOF
	$c -o hello hello.f > /dev/null 2>&1
	RETVAL=$?
	if test "x${RETVAL}" = x0 ; then
	    p_FC="$p_FC $c"
	fi
    done
    rm -f ./hello.f ./hello
    if test "x${p_FC}" = x ; then
	cat 1>&2 <<EOF

Error: No Fortran compilers were found in your path.  Please specify one using:

    1) an "optfile" on (eg. "-optfile=path/to/OPTFILE"),
    2) a command-line option (eg. "-fc NAME"), or
    3) the FC or MITGCM_FC environment variables.

EOF
	exit 1
    else
	echo "  The possible FORTRAN compilers found in your path are:"
	echo "   "$p_FC
	if test "x$FC" = x ; then
	    FC=`echo $p_FC | $AWK '{print $1}'`
	    echo "  Setting FORTRAN compiler to: "$FC
	fi
    fi

    if test "x$OPTFILE" = x ; then
	OPTFILE=$ROOTDIR"/tools/build_options/"$PLATFORM"_"$FC
	if test ! -r $OPTFILE ; then
             echo "  I looked for the file "$OPTFILE" but did not find it"
        fi
    fi
    if test "x$OPTFILE" = x ; then
	cat 1>&2 <<EOF

Error: No options file was found in:  $ROOTDIR/tools/build_options/
  that matches this platform ("$PLATFORM") and the compilers found in
  your path.  Please specify an "optfile" using:

    1) the command line (eg. "-optfile=path/to/OPTFILE"), or
    2) the MITGCM_OF environment variable.

  If you need help, please contact the developers at <MITgcm-support@mitgcm.org>.

EOF
	exit 1
    fi
    
}


AWK=awk

if test "x${ROOTDIR}" = x ; then
    tmp=`echo $PWD | sed -e 's/\// /g' | awk '{print $NR}'`
    if test "x$tmp" = "xbin" -a -d ../model -a -d ../eesup -a -d ../pkg ; then
	ROOTDIR=".."
    else
	for d in . .. ../.. ../../.. ../../../.. ../../../../.. ; do
	    if test -d "$d/model" -a -d "$d/eesupp" -a -d "$d/pkg" ; then
		ROOTDIR=$d
		printf "Warning:  ROOTDIR unspecified but there appears to be"
		echo " a copy of MITgcm at \"$ROOTDIR\""
		break
	    fi
	done
    fi
fi

tmp1=`uname`"_"`uname -m`
tmp2=`echo $tmp1 | sed -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
tmp3=`echo $tmp2 | sed -e 's/power macintosh/ppc/'`
tmp1=`echo $tmp3 | sed -e 's|x86_64|amd64|'`
tmp2=`echo $tmp1 | sed -e 's/i[3-6]86/ia32/' | sed -e 's/athlon/ia32/'`
tmp3=`echo $tmp2 | sed -e 's/cray sv1/craysv1/'`
PLATFORM=$tmp3
echo $PLATFORM | grep cygwin > /dev/null 2>&1  &&  PLATFORM=cygwin_ia32
echo "  The platform appears to be:  $PLATFORM"
echo "  And possible optfiles are: "
OFLIST=`(cd $ROOTDIR/tools/build_options; ls | grep "^$PLATFORM")`
for i in $OFLIST ; do
    echo "    $i"
done

find_possible_configs

echo
echo "  The default optfile is:  "$PLATFORM"_"$FC