#! /bin/bash

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

# Set up shell
if [ "$(echo ${VERBOSE} | tr '[:upper:]' '[:lower:]')" = 'yes' ]; then
    set -x                      # Output commands
fi
set -e                          # Abort on errors



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

if [ -z "${ZLIB_DIR}" ]; then
    echo "BEGIN MESSAGE"
    echo "zlib selected, but ZLIB_DIR not set. Checking some places..."
    echo "END MESSAGE"
    
    DIRS="/usr /usr/local /usr/local/packages /usr/local/apps /opt/local ${HOME} c:/packages"
    # look into each directory
    for dir in $DIRS; do
        # libraries might have different file extensions
        for libext in a dll dll.a dylib so; do
            # libraries can be in /lib or /lib64
            for libdir in lib64 lib/x86_64-linux-gnu lib lib/i386-linux-gnu lib/arm-linux-gnueabihf; do
                FILES="include/zlib.h $libdir/libz.$libext"
                # assume this is the one and check all needed files
                ZLIB_DIR="$dir"
                for file in $FILES; do
                    # discard this directory if one file was not found
                    if [ ! -r "$dir/$file" ]; then
                        unset ZLIB_DIR
                        break
                    fi
                done
                # don't look further if all files have been found
                if [ -n "$ZLIB_DIR" ]; then
                    break
                fi
            done
            # don't look further if all files have been found
            if [ -n "$ZLIB_DIR" ]; then
                break
            fi
        done
        # don't look further if all files have been found
        if [ -n "$ZLIB_DIR" ]; then
            break
        fi
    done
    
    if [ -z "$ZLIB_DIR" ]; then
        echo "BEGIN MESSAGE"
        echo "zlib not found"
        echo "END MESSAGE"
    else
        echo "BEGIN MESSAGE"
        echo "Found zlib in ${ZLIB_DIR}"
        echo "END MESSAGE"
    fi
fi



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

if [ -z "${ZLIB_DIR}"                                                   \
     -o "$(echo "${ZLIB_DIR}" | tr '[a-z]' '[A-Z]')" = 'BUILD' ]
then
    echo "BEGIN MESSAGE"
    echo "Building zlib..."
    echo "END MESSAGE"
    
    # check for required tools. Do this here so that we don't require them when
    # using the system library
    if [ x$TAR = x ] ; then
      echo 'BEGIN ERROR'
      echo 'Could not find tar command. Please make sure that (gnu) tar is present'
      echo 'and that the TAR variable is set to its location.'
      echo 'END ERROR'
      exit 1
    fi
    #if [ x$PATCH = x ] ; then
    #  echo 'BEGIN ERROR'
    #  echo 'Could not find patch command. Please make sure that (gnu) tar is present'
    #  echo 'and that the PATCH variable is set to its location.'
    #  echo 'END ERROR'
    #  exit 1
    #fi

    # Set locations
    THORN=zlib
    NAME=zlib-1.2.8
    SRCDIR="$(dirname $0)"
    BUILD_DIR=${SCRATCH_BUILD}/build/${THORN}
    if [ -z "${ZLIB_INSTALL_DIR}" ]; then
        INSTALL_DIR=${SCRATCH_BUILD}/external/${THORN}
    else
        echo "BEGIN MESSAGE"
        echo "Installing zlib into ${ZLIB_INSTALL_DIR}"
        echo "END MESSAGE"
        INSTALL_DIR=${ZLIB_INSTALL_DIR}
    fi
    DONE_FILE=${SCRATCH_BUILD}/done/${THORN}
    ZLIB_DIR=${INSTALL_DIR}
    
    if [ -e ${DONE_FILE} -a ${DONE_FILE} -nt ${SRCDIR}/dist/${NAME}.tar.gz \
                         -a ${DONE_FILE} -nt ${SRCDIR}/configure.sh ]
    then
        echo "BEGIN MESSAGE"
        echo "zlib has already been built; doing nothing"
        echo "END MESSAGE"
    else
        echo "BEGIN MESSAGE"
        echo "Building zlib"
        echo "END MESSAGE"

        # Build in a subshell
        (
        exec >&2                # Redirect stdout to stderr
        if [ "$(echo ${VERBOSE} | tr '[:upper:]' '[:lower:]')" = 'yes' ]; then
            set -x              # Output commands
        fi
        set -e                  # Abort on errors
        cd ${SCRATCH_BUILD}
        
        # Set up environment
        export LDFLAGS
        unset LIBS
        if echo '' ${ARFLAGS} | grep 64 > /dev/null 2>&1; then
            export OBJECT_MODE=64
        fi
        # Disable parallel make. With parallel make, I sometimes
        # encounter a build error "ld: in libz.a, malformed archive
        # TOC entry for _zlibVersion, offset 824872 is beyond end of
        # file 237568 for architecture x86_64"
        unset MAKEFLAGS
        
        echo "zlib: Preparing directory structure..."
        mkdir build external done 2> /dev/null || true
        rm -rf ${BUILD_DIR} ${INSTALL_DIR}
        mkdir ${BUILD_DIR} ${INSTALL_DIR}
        
        echo "zlib: Unpacking archive..."
        pushd ${BUILD_DIR}
        ${TAR?} xzf ${SRCDIR}/dist/${NAME}.tar.gz
        
        echo "zlib: Configuring..."
        cd ${NAME}
        ./configure --prefix=${ZLIB_DIR} --static
        
        echo "zlib: Building..."
        ${MAKE}
        
        echo "zlib: Installing..."
        ${MAKE} install prefix=${ZLIB_DIR}
        popd
        
        echo "zlib: Cleaning up..."
        rm -rf ${BUILD_DIR}
        
        date > ${DONE_FILE}
        echo "zlib: Done."
        )
        
        if (( $? )); then
            echo 'BEGIN ERROR'
            echo 'Error while building zlib. Aborting.'
            echo 'END ERROR'
            exit 1
        fi
    fi
    
fi



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

# Set options
if [ "${ZLIB_DIR}" != 'NO_BUILD' ]; then
    : ${ZLIB_INC_DIRS="${ZLIB_DIR}/include"}
    : ${ZLIB_LIB_DIRS="${ZLIB_DIR}/lib"}
fi
: ${ZLIB_LIBS='z'}

ZLIB_INC_DIRS="$(${CCTK_HOME}/lib/sbin/strip-incdirs.sh ${ZLIB_INC_DIRS})"
ZLIB_LIB_DIRS="$(${CCTK_HOME}/lib/sbin/strip-libdirs.sh ${ZLIB_LIB_DIRS})"

# Pass options to Cactus
echo "BEGIN MAKE_DEFINITION"
echo "ZLIB_DIR      = ${ZLIB_DIR}"
echo "ZLIB_INC_DIRS = ${ZLIB_INC_DIRS}"
echo "ZLIB_LIB_DIRS = ${ZLIB_LIB_DIRS}"
echo "ZLIB_LIBS     = ${ZLIB_LIBS}"
echo "END MAKE_DEFINITION"

echo 'INCLUDE_DIRECTORY $(ZLIB_INC_DIRS)'
echo 'LIBRARY_DIRECTORY $(ZLIB_LIB_DIRS)'
echo 'LIBRARY           $(ZLIB_LIBS)'