#! /bin/bash

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

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



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

if [ -z "${LIBJPEG_DIR}" -o "${LIBJPEG_DIR}" = 'BUILD' ]; then
    echo "BEGIN MESSAGE"
    echo "Building libjpeg..."
    echo "END MESSAGE"

    # Set locations
    THORN=libjpeg
    NAME=jpeg-8b
    SRCDIR=$(dirname $0)
    BUILD_DIR=${SCRATCH_BUILD}/build/${THORN}
    INSTALL_DIR=${SCRATCH_BUILD}/external/${THORN}
    DONE_FILE=${SCRATCH_BUILD}/done/${THORN}
    LIBJPEG_DIR=${INSTALL_DIR}

(
    exec >&2                    # Redirect stdout to stderr
    set -x                      # Output commands
    set -e                      # Abort on errors
    cd ${SCRATCH_DIR}
    if [ -e ${DONE_FILE} -a ${DONE_FILE} -nt ${SRCDIR}/dist/${NAME}.tar.gz \
                         -a ${DONE_FILE} -nt ${SRCDIR}/libjpeg.sh ]
    then
        echo "libjpeg: The enclosed libjpeg library has already been built; doing nothing"
    else
        echo "libjpeg: Building enclosed libjpeg 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)
        
        # Set up environment
        unset LIBS

        echo "libjpeg: Preparing directory structure..."
        mkdir build external done 2> /dev/null || true
        rm -rf ${BUILD_DIR} ${INSTALL_DIR}
        mkdir ${BUILD_DIR} ${INSTALL_DIR}

        echo "libjpeg: Unpacking archive..."
        pushd ${BUILD_DIR}
        ${TAR} xzf ${SRCDIR}/dist/${NAME}.tar.gz

        echo "libjpeg: Configuring..."
        cd ${NAME}
        ./configure --prefix=${LIBJPEG_DIR}
        
        echo "libjpeg: Building..."
        ${MAKE}
        
        echo "libjpeg: Installing..."
        ${MAKE} install
        popd
        
        echo "libjpeg: Cleaning up..."
        rm -rf ${BUILD_DIR}

        date > ${DONE_FILE}
        echo "libjpeg: Done."
    fi
)

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



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

# Set options
LIBJPEG_INC_DIRS="${LIBJPEG_DIR}/include"
LIBJPEG_LIB_DIRS="${LIBJPEG_DIR}/lib"
LIBJPEG_LIBS='jpeg'

# Pass options to Cactus
echo "BEGIN MAKE_DEFINITION"
echo "HAVE_LIBJPEG     = 1"
echo "LIBJPEG_DIR      = ${LIBJPEG_DIR}"
echo "LIBJPEG_INC_DIRS = ${LIBJPEG_INC_DIRS}"
echo "LIBJPEG_LIB_DIRS = ${LIBJPEG_LIB_DIRS}"
echo "LIBJPEG_LIBS     = ${LIBJPEG_LIBS}"
echo "END MAKE_DEFINITION"

echo 'INCLUDE_DIRECTORY $(LIBJPEG_INC_DIRS)'
echo 'LIBRARY_DIRECTORY $(LIBJPEG_LIB_DIRS)'
echo 'LIBRARY           $(LIBJPEG_LIBS)'