# Generate a changes file to describe binary packages and their changes
#
# Copyright (C) 2013 Patrick McDermott
#
# This file is part of opkbuild.
#
# opkbuild is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# opkbuild is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with opkbuild.  If not, see <http://www.gnu.org/licenses/>.

set -eu

write_changes()
{
	local version="${1}"
	local arch="${2}"
	local plat="${3}"
	shift 3
	local pkg=
	local desc=

	printf 'Format: 1.0\n' >&3

	printf 'Source: %s\n' "${OPK_SOURCE}" >&3
	printf 'Binary:' >&3
	printf '%s\n' $(ob_get_binary_packages) | LC_ALL='C' sort | \
		xargs printf ' %s' >&3
	printf '\n' >&3
	printf 'Version: %s\n' "${version}" >&3
	printf 'Architecture: %s\n' "${arch}" >&3
	printf 'Platform: %s\n' "${plat}" >&3

	printf 'Distribution: %s\n' \
		"$(ob_get_source_parameter 'Distribution')" >&3
	printf 'Maintainer: %s\n' "$(ob_get_source_parameter 'Maintainer' | \
		tr '\n' ' ')" >&3
	printf 'Changed-By: %s\n' "$(ob_get_source_parameter 'Uploader')" >&3
	printf 'Date: %s\n' "$(ob_get_source_parameter 'Date')" >&3

	printf 'Description:\n' >&3
	for pkg in $(ob_get_binary_packages); do
		ob_set_package_substvars "${pkg}"
		desc="$(ob_get_binary_parameter "${pkg}" 'Description' | \
			head -n 1)"
		desc="$(ob_substvars "${desc}" "${pkg}")"
		printf ' %s - %s\n' "${pkg}" "${desc}" >&3
	done

	printf 'Changes:\n%s\n' "$(ob_get_source_parameter 'Changes' | \
		sed 's/^$/./; s/^/ /;')" >&3

	return 0
}

write_files_src()
{
	local file=

	printf 'Files:\n' >&3
	file="src:${OPK_SOURCE}_${OPK_SOURCE_VERSION}_src_all.opk"
	printf ' %s %s %s\n' \
		"$(wc -c "../../${file}" | cut -d ' ' -f 1)" \
		'src' "${file}" >&3

	return 0
}

write_files_bin()
{
	local pkg=
	local arch=
	local plat=
	local sect=
	local file=

	printf 'Files:\n' >&3
	for pkg in ${OPK_PACKAGES_REDUCED}; do
		arch="$(ob_get_binary_parameter "${pkg}" 'Architecture')"
		[ x"${arch}" != x'all' ] && arch="${OPK_HOST_ARCH}"
		plat="$(ob_get_binary_parameter "${pkg}" 'Platform')"
		[ x"${plat}" != x'all' ] && plat="${OPK_HOST_PLAT}"
		sect="$(ob_get_binary_parameter "${pkg}" 'Section')"
		[ x"${sect}" = x'' ] && sect='base'
		file="$(ob_qualify_package_name "${pkg}" "${OPK_HOST_ARCH}")"
		file="${file}_${OPK_BINARY_VERSION}_${arch}_${plat}.opk"
		printf ' %s %s %s\n' \
			"$(wc -c "../../${file}" | cut -d ' ' -f 1)" \
			"${sect}" "${file}" >&3
	done

	return 0
}

main()
{
	local changes=

	if ! ob_set_text_domain 'opkbuild'; then
		printf '%s: Error: Failed to load locale messages\n' \
			"${0##*/}" >&2
		return 1
	fi

	ob_init_package '..' || return 1

	if [ x"${OB_DO_SOURCE:+set}" = x'set' ]; then
		changes="${OPK_SOURCE}_${OPK_SOURCE_VERSION}_src_all.changes"
		ob_info "$(ob_get_msg 'gen_changes')" "${changes}"
		exec 3>"../../${changes}"
		write_changes "${OPK_SOURCE_VERSION}" 'src' 'all'
		write_files_src
		exec 3>&-
	else
		changes="${OPK_SOURCE}_${OPK_SOURCE_VERSION}"
		changes="${changes}_${OPK_HOST_ARCH}_${OPK_HOST_PLAT}.changes"
		ob_info "$(ob_get_msg 'gen_changes')" "${changes}"
		exec 3>"../../${changes}"
		write_changes "${OPK_BINARY_VERSION}" \
			"${OPK_HOST_ARCH}" "${OPK_HOST_PLAT}"
		write_files_bin
		exec 3>&-
	fi

	return 0
}