#! /usr/bin/env bash

if [ ! -f 'build.sh' ]; then
	echo 'ERROR: This script must be run from the directory it is in' >&2

	exit 1
fi
if [ -z "${TCLVERS}" ]; then
	echo 'ERROR: The TCLVERS environment variable is not set' >&2

	exit 1
fi

ZLIBVERS="1.2.8"
SRC="src/zlib-${ZLIBVERS}.tar.gz"
SRCURL="http://sourceforge.net/projects/libpng/files/zlib/${ZLIBVERS}/zlib-${ZLIBVERS}.tar.gz/download"
BUILDDIR="$(pwd)/build/zlib-${ZLIBVERS}"
OUTDIR="$(pwd)/out"
INSTDIR="$(pwd)/inst"
PATCHSCRIPTDIR="$(pwd)/patchscripts"
PATCHDIR="$(pwd)/patches"
export ZLIBVERS SRC SRCURL BUILDDIR OUTDIR INSTDIR PATCHSCRIPTDIR PATCHDIR

# Set configure options for this sub-project
LDFLAGS="${KC_ZLIB_LDFLAGS}"
CFLAGS="${KC_ZLIB_CFLAGS}"
CPPFLAGS="${KC_ZLIB_CPPFLAGS}"
LIBS="${KC_ZLIB_LIBS}"
export LDFLAGS CFLAGS CPPFLAGS LIBS

rm -rf 'build' 'out' 'inst'
mkdir 'build' 'out' 'inst' || exit 1

if [ ! -f "${SRC}" ]; then
	mkdir 'src' >/dev/null 2>/dev/null

	if [ ! -d 'buildsrc' ]; then
		rm -f "${SRC}.tmp"
		wget -O "${SRC}.tmp" "${SRCURL}" || exit 1
		mv "${SRC}.tmp" "${SRC}"
	fi
fi

(
	cd 'build' || exit 1

	if [ ! -d '../buildsrc' ]; then
		gzip -dc "../${SRC}" | tar -xf -
	else    
		cp -rp ../buildsrc/* './'
	fi

	cd "${BUILDDIR}" || exit 1

	# Apply patches if needed
	for patch in "${PATCHDIR}/all"/zlib-${ZLIBVERS}-*.diff "${PATCHDIR}/all"/zlib-all-*.diff "${PATCHDIR}/${ZLIBVERS}"/zlib-${ZLIBVERS}-*.diff; do
		if [ ! -f "${patch}" ]; then
			continue
		fi

		echo "Applying: ${patch}"
		${PATCH:-patch} -p1 < "${patch}"
	done


	# Apply patch scripts if needed
	for patchscript in "${PATCHSCRIPTDIR}"/*.sh; do
		if [ -f "${patchscript}" ]; then
			echo "Running patch script: ${patchscript}"

			(
				. "${patchscript}"
			)
		fi
	done

	# If we are building for KitDLL, compile with '-fPIC'
	if [ "${KITTARGET}" = "kitdll" ]; then
		CFLAGS="${CFLAGS} -fPIC"
		export CFLAGS
	fi

	# We don't pass CONFIGUREEXTRA here, since this isn't a GNU autoconf
	# script and will puke
	echo "Running: ./configure --prefix=\"${INSTDIR}\" --libdir=\"${INSTDIR}/lib\""
	./configure --prefix="${INSTDIR}" --libdir="${INSTDIR}/lib"

	echo "Running: ${MAKE:-make}"
	${MAKE:-make} || exit 1

	echo "Running: ${MAKE:-make} install"
	${MAKE:-make} install

	# We don't really care too much about failure in zlib
	exit 0
) || exit 1

exit 0
