#!/bin/sh

set -e

if [ ! -x "$(which gbp 2> /dev/null)" ]
then
	echo "gbp - command not found" >&2
	exit 1
fi

if [ ! -e debian/changelog ]
then
	echo "E: debian/changelog - no such file" >&2
	exit 1
fi

MODE="$(basename ${0} | sed -e 's|^git-||' -e 's|-changelog$||')"

WRAP_SCRIPT="/usr/share/doc/git-buildpackage/examples/wrap_cl.py"

if [ -e "/usr/share/doc/git-buildpackage/examples/wrap_cl.py" ]
then
	CUSTOMIZATION="--customization ${WRAP_SCRIPT}"
fi

ID="${1}"

if [ -z "${ID}" ]
then
	if [ -n "$(git log | grep -m1 'Adding version ')" ]
	then
		ID="$(git log | grep -B4 -m1 "Adding version " | awk '/^commit / { print $2 }')"
	fi

	if [ -z "${ID}" ] && [ -n "$(git log | grep -m1 'Releasing version ')" ]
	then
		ID="$(git log | grep -B4 -m1 "Releasing version " | awk '/^commit / { print $2 }')"
	fi

	if [ -z "${ID}" ] && [ -n "$(git log | grep -m1 "Releasing ${MODE} version ")" ]
	then
		ID="$(git log | grep -B4 -m1 "Releasing ${MODE} version " | awk '/^commit / { print $2 }')"
	fi

	if [ -z "${ID}" ] && [ -n "$(git log | grep -m1 "Adding ${MODE} version ")" ]
	then
		ID="$(git log | grep -B4 -m1 "Adding ${MODE} version " | awk '/^commit / { print $2 }')"
	fi
else
	shift
fi

if [ -e debian/gbp.conf ]
then
	TEMPFILE="$(mktemp -p . -u)"
	mv debian/gbp.conf "${TEMPFILE}"
fi

SOURCE="$(dpkg-parsechangelog -S Source)"
URGENCY="$(dpkg-parsechangelog -S Urgency)"

if grep -qs "git.*.progress-linux.org" .git/config && grep -qs maintainers@lists.progress-linux.org debian/control
then
	DIST="$(git config --get remote.origin.url | awk -F/ '{ print $(NF-1) }')"
	DISTRIBUTION="--distribution=${DIST}"

	VERSION="$(dpkg-parsechangelog -S Version)"

	case "${VERSION}" in
		*progress*)
			VERSION=""
			;;

		*)
			case "${DIST}" in
				engywuck)
					case "${VERSION}" in
						*-*)
							# non-native
							VERSION="--dch-opt=-b -N ${VERSION}progress5u1"
							;;

						*)
							# native
							VERSION="--dch-opt=-b -N ${VERSION}-0progress5u1"
							;;
					esac
					;;

				engywuck-backports)
					case "${VERSION}" in
						*-*)
							# non-native
							VERSION="--dch-opt=-b -N ${VERSION}~progress5.99u1"
							;;

						*)
							# native
							VERSION="--dch-opt=-b -N ${VERSION}-0.0~progress5.99u1"
							;;
					esac
					;;

				fuchur)
					case "${VERSION}" in
						*-*)
							# non-native
							VERSION="--dch-opt=-b -N ${VERSION}progress6u1"
							;;

						*)
							# native
							VERSION="--dch-opt=-b -N ${VERSION}-0progress6u1"
							;;
					esac
					;;

				fuchur-backports)
					case "${VERSION}" in
						*-*)
							# non-native
							VERSION="--dch-opt=-b -N ${VERSION}~progress6.99u1"
							;;

						*)
							# native
							VERSION="--dch-opt=-b -N ${VERSION}-0.0~progress6.99u1"
							;;
					esac
					;;

				graograman|graograman-security)
					case "${VERSION}" in
						*-*)
							# non-native
							VERSION="--dch-opt=-b -N ${VERSION}progress7u1"
							;;

						*)
							# native
							VERSION="--dch-opt=-b -N ${VERSION}-0progress7u1"
							;;
					esac
					;;

				graograman-backports)
					case "${VERSION}" in
						*-*)
							# non-native
							VERSION="--dch-opt=-b -N ${VERSION}~progress7.99u1"
							;;

						*)
							# native
							VERSION="--dch-opt=-b -N ${VERSION}-0.0~progress7.99u1"
							;;
					esac
					;;
			esac
			;;
	esac
fi

if grep -qs "git.*.bfh.science" .git/config
then
	DIST="$(git config --get remote.origin.url | awk -F/ '{ print $(NF-1) }')"
	DISTRIBUTION="--distribution=${DIST}"

	case "${VERSION}" in
		*bfh*)
			VERSION=""
			;;

		*)
			case "${VERSION}" in
				*-*)
					# non-native
					VERSION="--dch-opt=-b -N ${VERSION}~bfh10.99u1"
					;;

				*)
					# native
					VERSION="--dch-opt=-b -N ${VERSION}-0.0~bfh10.99u1"
					;;
			esac
			;;
	esac
fi

if [ -n "${ID}" ]
then
	echo | gbp dch --spawn-editor=never ${DISTRIBUTION} ${VERSION} --urgency ${URGENCY} --git-log="--no-show-signature" --debian-branch $(git branch --show-current) --git-author --release --since ${ID} ${CUSTOMIZATION} ${@}
else
	echo | gbp dch --spawn-editor=never ${DISTRIBUTION} ${VERSION} --urgency ${URGENCY} --git-log="--no-show-signature" --auto --debian-branch $(git branch --show-current) --git-author --release ${CUSTOMIZATION} ${@}
fi

if [ -n "${DIST}" ]
then
	# derivatives
	if ! grep -qs "Initial upload to ${DIST}" debian/changelog || ! grep -qs "Initial reupload to ${DIST}" debian/changelog
	then
		sed -i -e "0,/^$/s//\n  * Initial upload to ${DIST}./" debian/changelog
	else
		sed -i -e "0,/^$/s//\n  * Uploading to ${DIST}, remaining changes:/" debian/changelog
	fi
else
	# debian
	DIST="$(dpkg-parsechangelog -S Distribution)"
	sed -i -e "0,/^$/s//\n  * Uploading to ${DIST}./" debian/changelog

	if git log ${ID}..HEAD | grep -qs 'Merging upstream version '
	then
		VERSION_NEW="$(git log ${ID}..HEAD | awk '/Merging upstream version/ { print $4 }' | sed -e 's|.$||')"
		VERSION_OLD="$(dpkg-parsechangelog -S Version)"

		sed -i -e "s|^${SOURCE} (${VERSION_OLD}) ${DIST}; urgency=${URGENCY}|${SOURCE} (${VERSION_NEW}-1) ${DIST}; urgency=${URGENCY}|" debian/changelog
	fi
fi

if [ -e "${TEMPFILE}" ]
then
	mv "${TEMPFILE}" debian/gbp.conf
fi

vi debian/changelog