#!/bin/bash
# Copyright (C) 2006 Petteri Räty <betelgeuse@gentoo.org>
# Copyright (C) 2006 Miroslav Šulc <fordfrog@gentoo.org>
# Licensed under GPL v2 or later

usage() {
	prog=$(basename "${0}")
	echo "Usage:"
	echo "  ${prog} (ebuild|jar) (ebuild|jar|pkg)"
	echo ""
	echo "For example:"
	echo "  apicheck foobar-1.0.ebuild foobar-1.1.ebuild"
	echo "  apicheck foobar-1.0.ebuild foobar.1.0.jar"
	echo "  apicheck bundledjar.jar gentoopackage"
	exit 1
}

debug() {
	if [[ "${DEBUG}" ]]; then
		return 0
	else
		return 1
	fi
}

if [[ $# -ne 2 ]]; then
	usage
fi

oldarg="${1}"
newarg="${2}"

if [[ -d /usr/share/${newarg} ]]; then
	pkg=true
fi

if ! [[ -e "${oldarg}" && ( -e "${newarg}" || ${pkg} ) ]]; then
	usage
fi

TMP_DIR="$(mktemp -d /tmp/$(basename ${0})-XXXXXX || exit 1)"
old="${TMP_DIR}/old.japi.gz"
new="${TMP_DIR}/new.japi.gz"
touch $old

end() {
	rm -v ${TMP_DIR}/*.japi.gz
	rmdir -v ${TMP_DIR}
	exit ${1}
}

getpkgtemp() {
	echo "${portagetmp}/$(sed -e "s%.*[/]%%" <<< sed -e "s/\.ebuild$//" <<< ${1})/"
}

getjars() {
	find "${1}/image" -name '*.jar' || end 1
}

generate_japi() {
	file=${1}
	shift
	debug && echo japize as ${file} packages $(java-config -r | tr : " ") "${@}"
	japize as ${file} packages $(java-config -r | tr : " " | xargs ls -1 2>/dev/null) "${@}" || end 1
}

listpackages() {
	packages=""
	for file in "${@}"; do
		newpackages=`jar tf ${file} | grep .class | sed -e "s%[/][^/]*\.class$%%g" | sed -e "s%/%.%g" | sort | uniq | sed -e "s/^/\+/"`
		if [[ ! -z "${newpackages}" ]]; then
			if [[ -z "${packages}" ]]; then
				packages=${newpackages}
			else
				packages="${packages} ${newpackages}"
			fi
		fi
	done
	packages=`echo ${packages} | sort | uniq`
	sed -e "s/\n/ /g" <<< ${packages}
}

getdepjars() {
	env=$(find ${1} -name "package.env")
	grep 'GENERATION=1' ${env} > /dev/null || source ${env}

	if [[ "${GENERATION}" = "2" && "${DEPEND}" ]]; then
		# parsing DEPEND for java-config -p call
		# after that removing colons
		java-config --classpath=$(echo ${DEPEND} \
			| sed -e 's/:/,/g' -e 's/^[^@]*@//' -re 's/(,)[^@]*@/\1/g') | \
		sed -e "s/:/ /g"
	fi
}

if [[ ${oldarg} = *ebuild ]]; then
	oldebuild=${oldarg}
	category=$(basename $(dirname $(dirname $(readlink -f ${oldebuild}))))
	portagetmp="$(portageq envvar PORTAGE_TMPDIR || end 1)/portage/${category}/"

	ebuild "${oldebuild}" install || end 1

	pkgtmp="$(getpkgtemp ${oldebuild})"
	[[ "${DEBUG}" ]] && echo ${pkgtmp}

	oldjars="$(getjars ${pkgtmp})"
else
	oldjars="${oldarg}"
fi

tocheck="$(listpackages ${oldjars})"

if [[ ${oldebuild} ]]; then
	debug && getdepjars "${pkgtmp}/image"
	generate_japi "${old}" ${oldjars} $(getdepjars "${pkgtmp}/image") ${tocheck}
elif [[ ${pkg} ]]; then
	generate_japi "${old}" ${oldjars} $(getdepjars "/usr/share/${newarg}") ${tocheck}
else
	generate_japi "${old}" ${oldjars} ${tocheck}
fi

if [[ ${newarg} = *ebuild ]]; then
	newebuild="${newarg}"
	ebuild "${newebuild}" install || end 1
	pkgtmp="$(getpkgtemp ${newebuild})"
	newjars="$(getjars ${pkgtmp})"
	debug && echo $pkgtmp
elif [[ ${pkg} ]]; then
	newjars=$(java-config -dp ${newarg} | tr : " ")
else
	newjars="${newarg}"
fi

if [[ ${newebuild} ]]; then
	generate_japi ${new} ${newjars} $(getdepjars "${pkgtmp}/image") ${tocheck}
else
	generate_japi ${new} ${newjars} ${tocheck}
fi

japicompat ${old} ${new}

end $?