#!/usr/bin/env bash

echo "WARNING: This project will happily delete all your packages if you are not careful!"
echo "To Proceed acknowledge that you have read this by deleting the \`exit 77\` line in this script"
exit 77

PACKAGE_NAME=herk
PACKAGE_MAINTAINER="herk <debian@herkulessi.de>"

set -eu
umask 077
TEMPDIR=$(mktemp -d -t packagesync-XXXXXXXX)

cd "$TEMPDIR" || exit 1

MISSING_DEPENDENCIES=()
command -v yq           >/dev/null 2>&1 || MISSING_DEPENDENCIES+=(yq)
command -v equivs-build >/dev/null 2>&1 || MISSING_DEPENDENCIES+=(equivs)
command -v stat         >/dev/null 2>&1 || MISSING_DEPENDENCIES+=(coreutils)
command -v mktemp       >/dev/null 2>&1 || MISSING_DEPENDENCIES+=(coreutils)

set +u
if [ "${#MISSING_DEPENDENCIES}" -gt 0 ]; then
	echo "Installing missing dependencies:" "${MISSING_DEPENDENCIES[@]}" ...
	apt-get install --no-install-recommends -yq "${MISSING_DEPENDENCIES[@]}"
	echo "Done installing dependencies."
fi
set -u

OLD_VERSION=$(dpkg-query --showformat='${Version}' --show "$PACKAGE_NAME" 2>/dev/null || echo 0)
NEW_VERSION=$(stat -c %Y /etc/packages.yaml)

if [ "$OLD_VERSION" -ge "$NEW_VERSION" ]; then
	cd /
	rm -rf "$TEMPDIR"
	apt-mark manual "$PACKAGE_NAME"
	apt-mark showmanual | grep -v "^${PACKAGE_NAME}$" | xargs apt-mark auto || true # ignore empty list
	apt-get autoremove --purge -yq
	exit 0
fi

cat > "$PACKAGE_NAME" << EOF
Section: misc
Priority: optional
Standards-Version: 3.9.2

Package:     $PACKAGE_NAME
Version:     $NEW_VERSION
Maintainer:  $PACKAGE_MAINTAINER
Depends:     $(< /etc/packages.yaml yq -r '.install | to_entries | map(.value) | add | map(tostring) | join(", ")'), apt, coreutils, equivs, findutils, yq
Conflicts:   $(< /etc/packages.yaml yq -r '.remove  | to_entries | map(.value) | add | map(tostring) | join(", ")')
Description: Metapackage for all needed packages.
  This is a dummy package, depending on other packages to make Package Management easier.
EOF

equivs-build "$PACKAGE_NAME"

apt-get install -yq --no-install-recommends ./${PACKAGE_NAME}_${NEW_VERSION}_all.deb

apt-mark manual "$PACKAGE_NAME"
apt-mark showmanual | grep -v "^${PACKAGE_NAME}$" | xargs apt-mark auto || true # ignore empty list

apt-get autoremove -yq --purge

cd /
rm -rf "$TEMPDIR"