#!/bin/sh

set -e

case "$(basename ${0})" in
	d*)
		MODE="debian"
		;;

	p*)
		MODE="progress-linux"
		;;

	b*)
		MODE="bfh"
		;;
esac

case "${MODE}" in
	debian)
		DOWNSTREAM_BRANCH=""
		;;

	progress-linux)
		MAINTAINER="Progress Linux Maintainers <maintainers@lists.progress-linux.org>"
		UPLOADERS="Daniel Baumann <daniel.baumann@progress-linux.org>"
		BUGS="mailto:maintainers@lists.progress-linux.org"

		if echo ${PWD} | grep -qs engywuck-backports
		then
			VCS_BROWSER="https://git.progress-linux.org/packages/engywuck-backports"
			VCS_GIT="https://git.progress-linux.org/packages/engywuck-backports"
		elif echo ${PWD} | grep -qs fuchur-backports
		then
			VCS_BROWSER="https://git.progress-linux.org/packages/fuchur-backports"
			VCS_GIT="https://git.progress-linux.org/packages/fuchur-backports"
		elif echo ${PWD} | grep -qs graograman-backports
		then
			VCS_BROWSER="https://git.progress-linux.org/packages/graograman-backports"
			VCS_GIT="https://git.progress-linux.org/packages/graograman-backports"
		elif echo ${PWD} | grep -qs engywuck
		then
			VCS_BROWSER="https://git.progress-linux.org/packages/engywuck"
			VCS_GIT="https://git.progress-linux.org/packages/engywuck"
		elif echo ${PWD} | grep -qs fuchur
		then
			VCS_BROWSER="https://git.progress-linux.org/packages/fuchur"
			VCS_GIT="https://git.progress-linux.org/packages/fuchur"
		elif echo ${PWD} | grep -qs graograman
		then
			VCS_BROWSER="https://git.progress-linux.org/packages/graograman"
			VCS_GIT="https://git.progress-linux.org/packages/graograman"
		else
			echo "NO VCS detection"
			exit 1
		fi

		DOWNSTREAM_BRANCH="progress-linux"
		;;

	bfh)
		MAINTAINER="Team Linux \& Infrastructure Services <bfh-linux-sysadmin@lists.bfh.science>"
		UPLOADERS="Daniel Baumann <daniel.baumann@bfh.ch>"
		BUGS="mailto:bfh-linux-users@lists.bfh.science"

		VCS_BROWSER="https://git.bfh.science/packages/buster-backports"
		VCS_GIT="https://git.bfh.science/packages/buster-backports"

		DOWNSTREAM_BRANCH="bfh"
		;;
esac

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"
PURPLE="\033[1;33;35m"

IMPORT="${1}"

case "${IMPORT}" in
	*.dsc|*.debian.tar.*)
		;;

	*)
		echo "Usage: ${0} *.dsc"
		echo "Usage: ${0} debian.tar.*"
		exit 1
		;;
esac

case "${IMPORT}" in
	http*)
		IMPORT_TEMPDIR="$(mktemp -d)"

		cd "${IMPORT_TEMPDIR}"

		case "${IMPORT}" in
			*.dsc)
				dget -d "${IMPORT}"
				;;

			*)
				wget "${IMPORT}"
				;;
		esac

		cd "${OLDPWD}"

		IMPORT="${IMPORT_TEMPDIR}/$(basename ${IMPORT})"
		;;
esac

PACKAGE="$(basename ${IMPORT} | awk -F_ '{ print $1 }')"

case "${IMPORT}" in
	*.dsc)
		DEB_VERSION="$(awk '/^Version: / { print $2 }' ${IMPORT})"

		case "${DEB_VERSION}" in
			*-*)
				DEB_UPSTREAM_VERSION="$(echo ${DEB_VERSION} | awk -F- '{ $NF=""; print $0 }' | sed -e 's| |-|g' -e 's|-$||g')"
				;;

			*)
				DEB_UPSTREAM_VERSION="${DEB_VERSION}"
				;;
		esac
		;;
esac

Add_initial_commit ()
{
	if [ ! -e .git ]
	then
		git init --shared
	fi

	if ! git log > /dev/null 2>&1
	then
		echo
		echo "################################################################################"
		echo "git: adding initial commit"
		echo "################################################################################"

		git commit -a -s -S -m "Initial commit." --allow-empty
	fi
}

Create_upstream_branch ()
{
	CURRENT_BRANCH="$(git branch --show-current)"

	case "${CURRENT_BRANCH}" in
		master|main)
			if ! git branch | grep -qs upstream
			then
				echo
				echo "################################################################################"
				echo "git: adding upstream branch"
				echo "################################################################################"

				git branch -m ${CURRENT_BRANCH} upstream
			fi
			;;
	esac
}

Switch_upstream_branch ()
{
	CURRENT_BRANCH="$(git branch --show-current)"

	if [ "${CURRENT_BRANCH}" != "upstream" ] && git branch | grep -qs upstream
	then
		echo
		echo "################################################################################"
		echo "git: switching to upstream branch"
		echo "################################################################################"

		git checkout upstream
	fi
}

Remove_everything ()
{
	echo
	echo "################################################################################"
	echo "git: removing all files"
	echo "################################################################################"

	echo -n "Removing files for new import..."

	find . -maxdepth 1 -mindepth 1 -and -not -name .git -print0 | xargs -0 -I '{}' rm -rf '{}'

	echo " done."
}

Unpack_upstream ()
{
	echo
	echo "################################################################################"
	echo "dpkg: unpacking upstream files"
	echo "################################################################################"

	TEMPDIR="$(mktemp -d -p . -u)"

	dpkg-source -x --no-copy --skip-debianization ${IMPORT} "${TEMPDIR}"
	rm -rf "${TEMPDIR}/debian"
	find "${TEMPDIR}" -type d -name ".git" -exec rm -rf {} \; || true

	DEBIAN_TAR="$(dirname $(readlink -f ${IMPORT}))/$(awk '/debian.tar.*$/ { print $3 }' ${IMPORT} | head -n1)"

	case "${DEBIAN_TAR}" in
		*.debian.tar.*)
			if [ -e "${DEBIAN_TAR}" ]
			then
				# this includes upstream additions outside debian/ into the upstream branch
				cd "${TEMPDIR}"
				tar xf "${DEBIAN_TAR}"
				rm -rf debian
				rm -rf .git
				cd "${OLDPWD}"
			fi
			;;
	esac

	find "${TEMPDIR}" -maxdepth 1 -mindepth 1 -print0 | xargs -0 -I '{}' mv '{}' .
	rmdir "${TEMPDIR}"
}

Add_upstream_version ()
{
	echo
	echo "################################################################################"
	echo "git: adding upstream version"
	echo "################################################################################"

	# FIXME
	git-upstream-add ${DEB_UPSTREAM_VERSION}
}

Create_debian_branch ()
{
	echo
	echo "################################################################################"
	echo "git: creating debian branch"
	echo "################################################################################"

	CURRENT_BRANCH="$(git branch --show-current)"

	if [ "${CURRENT_BRANCH}" = "upstream" ] && ! git branch | grep -qs debian
	then
		git branch debian
	fi
}

Switch_debian_branch ()
{
	CURRENT_BRANCH="$(git branch --show-current)"

	if [ "${CURRENT_BRANCH}" != "debian" ] && git branch | grep -qs debian
	then
		echo
		echo "################################################################################"
		echo "git: switching to debian branch"
		echo "################################################################################"

		git checkout debian
	fi
}

Unpack_debian ()
{
	echo
	echo "################################################################################"
	echo "dpkg: unpacking debian files"
	echo "################################################################################"

	TEMPDIR="$(mktemp -d -p . -u)"

	dpkg-source -x --no-copy --skip-patches ${IMPORT} ${TEMPDIR}
	find "${TEMPDIR}" -type d -name ".git" -exec rm -rf {} \; || true

	find "${TEMPDIR}" -maxdepth 1 -mindepth 1 -print0 | xargs -0 -I '{}' mv '{}' .

	rmdir ${TEMPDIR}
}

Add_debian_version ()
{
	echo
	echo "################################################################################"
	echo "git: adding debian version"
	echo "################################################################################"

	# FIXME
	git-debian-add
}

Create_downstream_branch ()
{
	echo
	echo "################################################################################"
	echo "git: create ${DOWNSTREAM_BRANCH} branch"
	echo "################################################################################"

	CURRENT_BRANCH="$(git branch --show-current)"

	if [ "${CURRENT_BRANCH}" = "debian" ] && ! git branch | grep -qs ${DOWNSTREAM_BRANCH}
	then
		git checkout -b ${DOWNSTREAM_BRANCH}
	fi
}

Update_maintainer_field ()
{
	if [ -e debian/templates/control.source.in ]
	then
		CONTROL="debian/templates/control.source.in"
	elif [ -e debian/control.in ]
	then
		CONTROL="debian/control.in"
	else
		CONTROL="debian/control"
	fi

	if ! grep -qs "^XSBC-Original-Maintainer: ${MAINTAINER}$" "${CONTROL}"
	then
		echo
		echo "################################################################################"
		echo "git: updating maintainer field"
		echo "################################################################################"

		if grep -qs "^Uploaders:" "${CONTROL}"
		then
			# sorting maintainer and uploaders fields
			ORIGINAL_MAINTAINER="$(grep '^Maintainer:' ${CONTROL})"

			# remove original maintainer field
			TEMPFILE="$(mktemp -p .)"
			grep -v "^Maintainer:" "${CONTROL}" > "${TEMPFILE}"
			rm -f "${CONTROL}"
			mv "${TEMPFILE}" "${CONTROL}"

			# readd original maintainer field
			sed -i	-e "s|^\(Uploaders.*\)$|${ORIGINAL_MAINTAINER}\n\1|" \
			"${CONTROL}"
		fi

		sed -i	-e "s|^Maintainer:|Maintainer: ${MAINTAINER}\nXSBC-Original-Maintainer:|" "${CONTROL}"

		git commit -a -s -S -m "Updating maintainer field."
	fi

	if [ -n "$(grep -s -r "^Maintainer:" debian | grep -v ^debian\/control)" ]
	then
		echo "WARNING: additional 'Maintainer:' fields outside debian/control{,.in} found!"
	fi
}

Update_uploaders_field ()
{
	if [ -e debian/templates/control.source.in ]
	then
		CONTROL="debian/templates/control.source.in"
	elif [ -e debian/control.in ]
	then
		CONTROL="debian/control.in"
	else
		CONTROL="debian/control"
	fi

	# FIXME: single uploader on one line, no multi-line
	if ! grep -qs "^XSBC-Uploaders: ${UPLOADERS}$" "${CONTROL}"
	then
		echo
		echo "################################################################################"
		echo "git: updating uploaders field"
		echo "################################################################################"

		sed -i	-e "s|^\(Maintainer:.*$\)|\1\nXSBC-Uploaders: ${UPLOADERS}|" \
			-e "s|^Uploaders:|XSBC-Original-Uploaders:|" \
		"${CONTROL}"

		git commit -a -s -S -m "Updating uploaders field."
	fi

	if [ -n "$(grep -s -r "^Uploaders:" debian | grep -v ^debian\/control)" ]
	then
		echo "WARNING: additional 'Uploaders:' fields outside debian/control{,.in} found!"
	fi
}

Update_bugs_field ()
{
	if [ -e debian/templates/control.source.in ]
	then
		CONTROL="debian/templates/control.source.in"
	elif [ -e debian/control.in ]
	then
		CONTROL="debian/control.in"
	else
		CONTROL="debian/control"
	fi

	if ! grep -qs "^Bugs: ${BUGS}$" "${CONTROL}"
	then
		echo
		echo "################################################################################"
		echo "git: updating bugs field"
		echo "################################################################################"

		# remove original bugs fields
		TEMPFILE="$(mktemp -p .)"
		grep -v "^Bugs:" "${CONTROL}" > "${TEMPFILE}"
		rm -f "${CONTROL}"
		mv "${TEMPFILE}" "${CONTROL}"

		# add new bugs field
		if grep -qs "^XSBC-Original-Uploaders:" "${CONTROL}"
		then
			NEXT_FIELD_AFTER_UPLOADERS="$(grep -v '^ ' ${CONTROL} | grep -v '^	' | grep -A1 -m1 '^XSBC-Original-Uploaders:' | tail -n1 | awk -F: '{ print $1 }')"
		else
			NEXT_FIELD_AFTER_UPLOADERS="$(grep -v '^ ' ${CONTROL} | grep -v '^	' | grep -A1 -m1 '^XSBC-Original-Maintainer:' | tail -n1 | awk -F: '{ print $1 }')"
		fi

		case "${NEXT_FIELD_AFTER_UPLOADERS}" in
			Package:*)
				LAST_LINE_OF_SOURCE_BLOCK="$(grep -B2 -m1 '^Package:' ${CONTROL} | head -n1)"

				sed -i	-e "s|\(^${LAST_LINE_OF_SOURCE_BLOCK}$\)|\1\nBugs: ${BUGS}|" \
				"${CONTROL}"
				;;

			*)
				sed -i	-e "s|^\(${NEXT_FIELD_AFTER_UPLOADERS}\)|Bugs: ${BUGS}\n\1|" \
				"${CONTROL}"
				;;
		esac

		git commit -a -s -S -m "Updating bugs field."

		if [ $(grep -c "^Bugs:" ${CONTROL}) -gt 1 ]
		then
			echo "${RED}WARNING:${NORMAL} duplicates of 'Bugs:' fields in debian/control{,.in} found!"
		fi
	fi
}

Update_vcs_fields ()
{
	if [ -e debian/templates/control.source.in ]
	then
		CONTROL="debian/templates/control.source.in"
	elif [ -e debian/control.in ]
	then
		CONTROL="debian/control.in"
	else
		CONTROL="debian/control"
	fi

	if ! grep -qs "^Vcs-Browser: ${VCS_BROWSER}/${PACKAGE}$" "${CONTROL}" && \
	   ! grep -qs "^Vcs-Git: ${VCS_BROWSER}/${PACKAGE}$" "${CONTROL}"
	then
		echo
		echo "################################################################################"
		echo "git: updating vcs fields"
		echo "################################################################################"

		sed -i	-e 's|^Vcs-browser|Vcs-Browser|' \
			-e 's|^Vcs-git|Vcs-Git|' \
		"${CONTROL}"

		# replace original vcs fields
		sed -i	-e 's|^Vcs-|XSBC-Original-Vcs-|g' \
		"${CONTROL}"

		if ! grep -qs "^XSBC-Original-Vcs-" "${CONTROL}"
		then
			# no vcs in original file
			LAST_LINE_OF_SOURCE_BLOCK="$(grep -B2 -m1 '^Package:' ${CONTROL} | head -n1)"

			sed -i	-e "s|\(^${LAST_LINE_OF_SOURCE_BLOCK}.*$\)|\1\nVcs-Browser: ${VCS_BROWSER}/${PACKAGE}\nVcs-Git: ${VCS_GIT}/${PACKAGE}|" \
			"${CONTROL}"
		else
			# vcs fields in original file
			ORIGINAL_VCS_BROWSER="$(grep '^XSBC-Original-Vcs-Browser' ${CONTROL})"

			TEMPFILE="$(mktemp -p . -u)"
			grep -v "^XSBC-Original-Vcs-Browser" "${CONTROL}" > "${TEMPFILE}"
			rm -f "${CONTROL}"
			mv "${TEMPFILE}" "${CONTROL}"

			# FIXME: handle cases where only Vcs-Browser is there, but no Vcs-Git
			ORIGINAL_VCS_OTHER="$(grep '^XSBC-Original-Vcs' ${CONTROL})"
			sed -i	-e "s|^\(XSBC-Original-Vcs-.*\)$|Vcs-Browser: ${VCS_BROWSER}/${PACKAGE}\nVcs-Git: ${VCS_GIT}/${PACKAGE}\n${ORIGINAL_VCS_BROWSER}\n\1|" \
			"${CONTROL}"
		fi
	fi

	if [ -n "$(git status --porcelain)" ]
	then
		git commit -a -s -S -m "Updating vcs fields."
	fi
}

Update_source_format ()
{
	if ! grep -qs '^3.0 (quilt)' debian/source/format
	then
		echo
		echo "################################################################################"
		echo "git: updating source format"
		echo "################################################################################"

		mkdir -p debian/source
		echo "3.0 (quilt)" > debian/source/format

		git add .
		git commit -a -s -S -m "Updating source format."
	fi
}

echo "################################################################################"
echo "git: importing ${IMPORT}"
echo "################################################################################"

case "${IMPORT}" in
	*.debian.tar.*)
		git checkout debian

		rm -rf debian
		tar xf ${IMPORT_TEMPDIR}/*.debian.tar.*
		git-debian-add

		git checkout -

		rm -rf "${IMPORT_TEMPDIR}"
		exit 0
		;;
esac

Add_initial_commit

Create_upstream_branch
Switch_upstream_branch
Remove_everything
Unpack_upstream
Add_upstream_version

Create_debian_branch
Switch_debian_branch
Remove_everything
Unpack_debian
Add_debian_version

if [ -n "${IMPORT_TEMPDIR}" ]
then
	rm -rf "${IMPORT_TEMPDIR}"
fi

# progress-linux / bfh
if [ -n "${DOWNSTREAM_BRANCH}" ]
then
	Create_downstream_branch

	Update_maintainer_field
	Update_uploaders_field
	Update_bugs_field
	Update_vcs_fields
	Update_source_format

	if [ -e debian/control.in ] || [ -e debian/templates/control.source.in ] || [ -e debian/control.md5sum ]
	then
		echo "################################################################################"
		echo "${RED}WARNING:${NORMAL} debian/control.in exists,"
		echo "likely the debian files need to be regenerated (manually)."
		echo "################################################################################"
	fi

	if [ "$(grep -rs '^Maintainer:' debian | wc -l )" -gt 1 ]
	then
		echo "################################################################################"
		echo "${RED}WARNING:${NORMAL} more than one Maintainer field exists,"
		echo "likely further debian files need to be changed (manually)."
		echo "################################################################################"
	fi
fi