#! /bin/bash

################################################################################
# Prepare
################################################################################

# Set up shell
set -x                          # Output commands
set -e                          # Abort on errors



################################################################################
# Search
################################################################################

if [ -z "${SAGA_DIR}" ]; then
    echo "BEGIN MESSAGE"
    echo "SAGA selected, but SAGA_DIR not set. Checking some places..."
    echo "END MESSAGE"
    
    FILES="include/saga/saga-config.hpp lib/libsaga_core.a"
    DIRS="/usr /usr/local /usr/local/saga /usr/local/packages/saga /usr/local/apps/saga /opt/local ${HOME} ${HOME}/saga c:/packages/saga"
    for dir in $DIRS; do
        SAGA_DIR="$dir"
        for file in $FILES; do
            if [ ! -r "$dir/$file" ]; then
                unset SAGA_DIR
                break
            fi
        done
        if [ -n "$SAGA_DIR" ]; then
            break
        fi
    done
    
    if [ -z "$SAGA_DIR" ]; then
        echo "BEGIN MESSAGE"
        echo "SAGA not found"
        echo "END MESSAGE"
    else
        echo "BEGIN MESSAGE"
        echo "Found SAGA in ${SAGA_DIR}"
        echo "END MESSAGE"
    fi
fi



################################################################################
# Build
################################################################################

if [ -z "${SAGA_DIR}" -o "${SAGA_DIR}" = 'BUILD' ]; then
    echo "BEGIN MESSAGE"
    echo "Building SAGA..."
    echo "END MESSAGE"
    
    # Set locations
    THORN=SAGA
    NAME=saga-core-1.6
    SRCDIR=$(dirname $0)
    BUILD_DIR=${SCRATCH_BUILD}/build/${THORN}
    if [ -z "${SAGA_INSTALL_DIR}" ]; then
        echo "BEGIN MESSAGE"
        echo "SAGA install directory, SAGA_INSTALL_DIR, not set. Installing in the default configuration location. "
        echo "END MESSAGE"
     INSTALL_DIR=${SCRATCH_BUILD}/external/${THORN}
    else
        echo "BEGIN MESSAGE"
        echo "SAGA install directory, SAGA_INSTALL_DIR, selected. Installing SAGA at ${SAGA_INSTALL_DIR} "
        echo "END MESSAGE"
     INSTALL_DIR=${SAGA_INSTALL_DIR}
    fi
    DONE_FILE=${SCRATCH_BUILD}/done/${THORN}
    SAGA_DIR=${INSTALL_DIR}
    
(
    exec >&2                    # Redirect stdout to stderr
    set -x                      # Output commands
    set -e                      # Abort on errors
    cd ${SCRATCH_BUILD}
    if [ -e ${DONE_FILE} -a ${DONE_FILE} -nt ${SRCDIR}/dist/${NAME}.tgz \
                         -a ${DONE_FILE} -nt ${SRCDIR}/SAGA.sh ]
    then
        echo "SAGA: The enclosed SAGA library has already been built; doing nothing"
    else
        echo "SAGA: Building enclosed SAGA library"
        
        # Should we use gmake or make?
        MAKE=$(gmake --help > /dev/null 2>&1 && echo gmake || echo make)
        # Should we use gtar or tar?
        TAR=$(gtar --help > /dev/null 2> /dev/null && echo gtar || echo tar)
        # Should we use gpatch or patch?
        if [ -z "$PATCH" ]; then
            PATCH=$(gpatch -v > /dev/null 2>&1 && echo gpatch || echo patch)
        fi
        
        # Set up environment
        unset LIBS
        if echo '' ${ARFLAGS} | grep 64 > /dev/null 2>&1; then
            export OBJECT_MODE=64
        fi
        
        echo "SAGA: Preparing directory structure..."
        mkdir build external done 2> /dev/null || true
        rm -rf ${BUILD_DIR} ${INSTALL_DIR}
        mkdir ${BUILD_DIR} ${INSTALL_DIR}
        
        echo "SAGA: Unpacking archive..."
        pushd ${BUILD_DIR}
        ${TAR} xzf ${SRCDIR}/dist/${NAME}.tgz
        ${PATCH} -p0 < ${SRCDIR}/dist/icpc_options.patch
        ${PATCH} -p0 < ${SRCDIR}/dist/check_if_open__missing_this
        
        echo "SAGA: Configuring..."
        cd ${NAME}

        # Enforce gcc if Intel compiler would otherwise be used, until Saga
        # builds with Intel compiler
        if $CC --version | grep -q icc; then
          CC=gcc
          CFLAGS="-O2"
          CXX=g++
          CXXFLAGS="-O2"
        fi

        ./configure --prefix=${SAGA_DIR} 
        
        echo "SAGA: Building..."
        ${MAKE} -n
        
        echo "SAGA: Installing..."
        ${MAKE} install
        popd
        
        echo "SAGA: Cleaning up..."
        rm -rf ${BUILD_DIR}
        
        date > ${DONE_FILE}
        echo "SAGA: Done."
    fi
)

    if (( $? )); then
        echo 'BEGIN ERROR'
        echo 'Error while building SAGA. Aborting.'
        echo 'END ERROR'
        exit 1
    fi
    
fi



# Set options
SAGA_INC_DIRS="$(${SAGA_DIR}/bin/saga-config --cppflags | sed -e 's/ \+-[^I][^ ]\+//g;s/^ *-[^I][^ ]\+ *//g;s/ \+-I/ /g;s/^ *-I//g')"
SAGA_LIB_DIRS="$(${SAGA_DIR}/bin/saga-config --libs   | sed -e 's/ \+-[^L][^ ]\+//g;s/^ *-[^L][^ ]\+ *//g;s/ \+\/.*//g;s/ \+-L/ /g;s/^ *-L//g')"
# remove standard lib dirs (e.g. /usr/lib)
SAGA_LIB_DIRS=`echo $SAGA_LIB_DIRS | sed -e 's/\/usr\/\+lib//g'`
SAGA_LIBS="$(${SAGA_DIR}/bin/saga-config --libs   | sed -e 's/ \+-[^l][^ ]\+//g;s/^ *-[^l][^ ]\+ *//g;s/ \+\/.*//g;s/ \+-l/ /g;s/^ *-l//g')"


################################################################################
# Configure Cactus
################################################################################

# Pass options to Cactus
echo "BEGIN MAKE_DEFINITION"
echo "HAVE_SAGA     = 1"
echo "SAGA_DIR      = ${SAGA_DIR}"
echo "SAGA_INC_DIRS = ${SAGA_INC_DIRS}"
echo "SAGA_LIB_DIRS = ${SAGA_LIB_DIRS}"
echo "SAGA_LIBS     = ${SAGA_LIBS}"
echo "END MAKE_DEFINITION"

echo 'INCLUDE_DIRECTORY $(SAGA_INC_DIRS)'
echo 'LIBRARY_DIRECTORY $(SAGA_LIB_DIRS)'
echo 'LIBRARY           $(SAGA_LIBS)'