#!/bin/sh

set -e

RED="\033[1;33;31m"
GREEN="\033[1;33;32m"
YELLOW="\033[1;33;33m"
BLUE="\033[1;33;34m"
WHITE="\033[1;33;37m"
NORMAL="\033[0m"

# FIXME: getopt
# FIXME: -f for forced indices download
# FIXME: download downstream binary index and check for architecture-missing-builds

MODE="$(basename ${0} | awk -F. '{ print $2 }')"

case "${MODE}" in
	engywuck)
		UPSTREAM_DISTRIBUTIONS="buster buster-updates buster-proposed-updates"
		DOWNSTREAM_DISTRIBUTION="engywuck"
		DOWNSTREAM_MIRROR="https://apt.progress-linux.org/packages"
		DOWNSTREAM_TAG="progress"
		;;

	engywuck-backports)
		UPSTREAM_DISTRIBUTIONS="bullseye bullseye-updates bullseye-proposed-updates"
		DOWNSTREAM_DISTRIBUTION="engywuck-backports"
		DOWNSTREAM_MIRROR="https://apt.progress-linux.org/packages"
		DOWNSTREAM_TAG="progress"
		;;

	fuchur)
		UPSTREAM_DISTRIBUTIONS="bullseye bullseye-updates bullseye-proposed-updates"
		DOWNSTREAM_DISTRIBUTION="fuchur"
		DOWNSTREAM_MIRROR="https://apt.progress-linux.org/packages"
		DOWNSTREAM_TAG="progress"
		;;

	fuchur-backports)
		UPSTREAM_DISTRIBUTIONS="bookworm"
		DOWNSTREAM_DISTRIBUTION="fuchur-backports"
		DOWNSTREAM_MIRROR="https://apt.progress-linux.org/packages"
		DOWNSTREAM_TAG="progress"
		;;

	graograman)
		UPSTREAM_DISTRIBUTIONS="bookworm bookworm-updates bookworm-proposed-updates"
		DOWNSTREAM_DISTRIBUTION="graograman"
		DOWNSTREAM_MIRROR="https://apt.progress-linux.org/packages"
		DOWNSTREAM_TAG="progress"
		;;

	graograman-backports)
		UPSTREAM_DISTRIBUTIONS="sid experimental"
		DOWNSTREAM_DISTRIBUTION="graograman-backports"
		DOWNSTREAM_MIRROR="https://apt.progress-linux.org/packages"
		DOWNSTREAM_TAG="progress"
		;;

	buster)
		UPSTREAM_DISTRIBUTIONS="buster buster-updates buster-proposed-updates"
		DOWNSTREAM_DISTRIBUTION="buster"
		DOWNSTREAM_MIRROR="https://apt.bfh.science/packages"
		DOWNSTREAM_TAG="bfh"
		;;

	buster-backports)
		UPSTREAM_DISTRIBUTIONS="sid experimental"
		DOWNSTREAM_DISTRIBUTION="buster-backports"
		DOWNSTREAM_MIRROR="https://apt.bfh.science/packages"
		DOWNSTREAM_TAG="bfh"
		;;
esac

UPSTREAM_SECTIONS="main contrib non-free"
UPSTREAM_MIRROR="http://debian.ethz.ch/debian"

DOWNSTREAM_SECTIONS="main contrib non-free"

#ARCHITECTURES="amd64 armel armhf arm64 i386 all source"
ARCHITECTURES="amd64 arm64 all source"

Download_downstream_indices ()
{
	# Download downstream indices
#	if [ -e "downstream.${MODE}.sources" ] && [ "$(( $(stat -c %Y downstream.${MODE}.sources) + ( 4 * 3600 ) ))" -lt "$(date +%s)" ]
#	then
#		# file is older than 4 hours
		rm -f "downstream.${MODE}.sources"
#	fi

	if [ ! -e "downstream.${MODE}.sources" ]
	then
		for SECTION in ${DOWNSTREAM_SECTIONS}
		do
			wget -q -O - "${DOWNSTREAM_MIRROR}/dists/${DOWNSTREAM_DISTRIBUTION}/${SECTION}/source/Sources.xz" | xz -d >> "downstream.${MODE}.sources"
		done
	fi
}

Download_upstream_indices ()
{
	# Download upstream indices
#	if [ -e "upstream.${MODE}.sources" ] && [ "$(( $(stat -c %Y upstream.${MODE}.sources) + ( 4 * 3600 ) ))" -lt "$(date +%s)" ]
#	then
#		# file is older than 4 hours
		rm -f "upstream.${MODE}.sources"
#	fi

#	if [ -e "upstream.${MODE}.binaries" ] && [ "$(( $(stat -c %Y upstream.${MODE}.binaries) + ( 4 * 3600 ) ))" -lt "$(date +%s)" ]
#	then
#		# file is older than 4 hours
		rm -f "upstream.${MODE}.binaries"
#	fi

#	if [ ! -e "upstream.${MODE}.indices" ]
#	then
		echo -n "Downloading indices... "

		for DISTRIBUTION in ${UPSTREAM_DISTRIBUTIONS}
		do
			case "${DISTRIBUTION}" in
				*-*)
					;;

				*)
					if wget -q -O /dev/null "http://security.debian.org/dists/${DISTRIBUTION}/updates/Release"
					then
						for SECTION in ${UPSTREAM_SECTIONS}
						do
							for ARCHITECTURE in ${ARCHITECTURES}
							do
								echo -n "."

								case "${ARCHITECTURE}" in
									source)
										wget -q -O - "http://security.debian.org/dists/${DISTRIBUTION}/updates/${SECTION}/${ARCHITECTURE}/Sources.xz" | xz -d >> "upstream.${MODE}.sources"
										;;

									*)
										if wget -q -O /dev/null "http://security.debian.org/dists/${DISTRIBUTION}/updates/${SECTION}/binary-${ARCHITECTURE}/Packages.xz"
										then
											wget -q -O - "http://security.debian.org/dists/${DISTRIBUTION}/updates/${SECTION}/binary-${ARCHITECTURE}/Packages.xz" | xz -d >> "upstream.${MODE}.binaries"
										fi
										;;
								esac
							done
						done
					fi

					if wget -q -O /dev/null "http://security.debian.org/dists/${DISTRIBUTION}-security/Release"
					then
						for SECTION in ${UPSTREAM_SECTIONS}
						do
							for ARCHITECTURE in ${ARCHITECTURES}
							do
								echo -n "."

								case "${ARCHITECTURE}" in
									source)
										wget -q -O - "http://security.debian.org/dists/${DISTRIBUTION}-security/${SECTION}/${ARCHITECTURE}/Sources.xz" | xz -d >> "upstream.${MODE}.sources"
										;;

									*)
										wget -q -O - "http://security.debian.org/dists/${DISTRIBUTION}-security/${SECTION}/binary-${ARCHITECTURE}/Packages.xz" | xz -d >> "upstream.${MODE}.binaries"
										;;
								esac
							done
						done
					fi
					;;
			esac

			for SECTION in ${UPSTREAM_SECTIONS}
			do
				for ARCHITECTURE in ${ARCHITECTURES}
				do
					echo -n "."

					case "${ARCHITECTURE}" in
						source)
							wget -q -O - "${UPSTREAM_MIRROR}/dists/${DISTRIBUTION}/${SECTION}/${ARCHITECTURE}/Sources.xz" | xz -d >> "upstream.${MODE}.sources"
							;;

						*)
							wget -q -O - "${UPSTREAM_MIRROR}/dists/${DISTRIBUTION}/${SECTION}/binary-${ARCHITECTURE}/Packages.xz" | xz -d >> "upstream.${MODE}.binaries"
							;;
					esac
				done
			done
		done

		echo " done."
#	fi
}

Download_downstream_indices
Download_upstream_indices

# Process downstream indices
DOWNSTREAM_PACKAGES="$(awk '/^Package: / { print $2 }' downstream.${MODE}.sources | sort -u)"

echo "################################################################################"
echo "${DOWNSTREAM_DISTRIBUTION}"
echo "################################################################################"

echo -n "Comparing versions... "

for PACKAGE in ${DOWNSTREAM_PACKAGES}
do
	DOWNSTREAM_VERSION="$(sed -n "/^Package: ${PACKAGE}$/,/^Version:/p" downstream.${MODE}.sources | awk '/^Version: / { print $2 }')"

	case "${MODE}" in
		*-backports)
			# ignore BinNMUs
			UPSTREAM_VERSION="$(sed -n "/^Package: ${PACKAGE}$/,/^Version:/p" upstream.${MODE}.sources | awk '/^Version: / { print $2 }' | sort -rV | head -n1)"
			;;

		*)
			# upstream_source_version = highest version of (upstream_source_versions + upstream_binary_versions)
			UPSTREAM_VERSION="$(grep -A2 "^Package: ${PACKAGE}\$" upstream.${MODE}.sources | awk '/^Version: / { print $2 }') $(for BINARY in $(grep -A1 "^Package: ${PACKAGE}\$" upstream.${MODE}.sources | grep '^Binary:' | cut -d: -f 2- | sed -e 's|,||g'); do grep -A2 "^Package: ${BINARY}\$" upstream.${MODE}.binaries ; done | awk '/^Version: / { print $2 }')"
			UPSTREAM_VERSION="$(echo ${UPSTREAM_VERSION} | sed -e 's| |\n|g' | sort -rV | head -n1)"
			;;
	esac

	if echo ${UPSTREAM_VERSION} | grep -qs '-'
	then
		# package is non-native
		DOWNSTREAM="$(echo ${DOWNSTREAM_VERSION} | sed -e "s|~${DOWNSTREAM_TAG}.*||" -e "s|${DOWNSTREAM_TAG}.*||")"
	else
		# package is native
		DOWNSTREAM="$(echo ${DOWNSTREAM_VERSION} | sed -e "s|-0.0~${DOWNSTREAM_TAG}.*||" -e "s|-0.*${DOWNSTREAM_TAG}.*||")"
	fi

	if grep -qs "^${PACKAGE} ${UPSTREAM_VERSION}$" ignore.txt
	then
		continue
	fi

	if [ -z "${UPSTREAM_VERSION}" ] && grep -qs "^${PACKAGE} ${DOWNSTREAM_VERSION}$" ignore.txt
	then
		continue
	fi

	if [ -z "${UPSTREAM_VERSION}" ]
	then
		echo " ${BLUE}${PACKAGE}${NORMAL} (!${DOWNSTREAM_VERSION})"
		continue
	fi

	# comparing versions
	if dpkg --compare-versions ${UPSTREAM_VERSION} eq ${DOWNSTREAM}
	then
		echo -n "."
	elif dpkg --compare-versions ${UPSTREAM_VERSION} gt ${DOWNSTREAM}
	then
		echo " ${RED}${PACKAGE}${NORMAL} (${UPSTREAM_VERSION} >> ${DOWNSTREAM_VERSION})"
	elif dpkg --compare-versions ${UPSTREAM_VERSION} lt ${DOWNSTREAM}
	then
		echo " ${YELLOW}${PACKAGE}${NORMAL} (${UPSTREAM_VERSION} << ${DOWNSTREAM_VERSION})"
	else
		echo " ${PACKAGE}: internal error"
	fi
done

echo " done."