#!/bin/bash
##
##  Package update helper script which sets new SHA-256 for source bundle.
##
##  Copyright 2020 Leonid Pliushch <leonid.pliushch@gmail.com>
##
##  Licensed under the Apache License, Version 2.0 (the "License");
##  you may not use this file except in compliance with the License.
##  You may obtain a copy of the License at
##
##    http://www.apache.org/licenses/LICENSE-2.0
##
##  Unless required by applicable law or agreed to in writing, software
##  distributed under the License is distributed on an "AS IS" BASIS,
##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
##  See the License for the specific language governing permissions and
##  limitations under the License.
##

set -e

if [ "${#}" = "0" ]; then
	echo
	echo "Usage: update-sha256 [package name] ..."
	echo
	echo "Update TERMUX_PKG_SHA256 of package and optionally commit changes."
	echo
	exit 1
fi

REPO_ROOT=$(realpath "$(dirname "$0")/../../")
IS_GIT_REPOSITORY=false

if git status >/dev/null 2>&1; then
	IS_GIT_REPOSITORY=true
fi

for package in "${@}"; do
	buildsh_path="${REPO_ROOT}/packages/${package}/build.sh"

	if [ ! -f "${buildsh_path}" ]; then
		echo "${package}: skipping as no build.sh found"
		continue
	fi

	# Calculate new checksum in subshell.
	echo
	new_checksum=$(
		source "${buildsh_path}" 2>/dev/null

		dl_tmpdir=$(mktemp -d "${TMPDIR-/tmp}/termux.src.dl.XXXXXXXX")

		if [ -n "${dl_tmpdir}" ] && [ -d "${dl_tmpdir}" ]; then
			if ! curl --fail --location --retry 3 --output "${dl_tmpdir}/source-bundle" \
				"${TERMUX_PKG_SRCURL[0]}"; then
				rm -rf "${dl_tmpdir}"
			fi

			if [ -f "${dl_tmpdir}/source-bundle" ]; then
				sha256sum "${dl_tmpdir}/source-bundle" | awk '{ print $1 }'
			fi

			rm -rf "${dl_tmpdir}"
		fi
	)

	if [ -n "${new_checksum}" ]; then
		# Replace old SHA-256.
		# Note that this will not work properly if SHA-256 is an array.
		sed -i "s/^\(TERMUX_PKG_SHA256=\)\(.*\)\$/\1${new_checksum}/g" "${buildsh_path}"

		# Delete revision as it shouldn't be present if package was updated.
		sed -i "/TERMUX_PKG_REVISION=/d" "${buildsh_path}"

		# If we are on Git repository, prompt for committing changes.
		if ${IS_GIT_REPOSITORY}; then
			echo
			echo "You are about to commit these changes:"
			echo
			echo "--------------------"
			git diff --patch "${buildsh_path}"
			echo "--------------------"
			echo
			echo "${1}: update to $(. "${buildsh_path}"; echo "${TERMUX_PKG_VERSION}")"
			echo
			read -re -p "Do you want to commit changes ? (y/n) " CHOICE
			echo
			if [[ ${CHOICE} =~ (Y|y) ]]; then
				git add "${buildsh_path}"
				git commit -m "${package}: update to $(. "${buildsh_path}"; echo "${TERMUX_PKG_VERSION}")"
			else
				echo "Not committing to Git!"
			fi
			echo
		fi
	else
		echo
		echo "${package}: failed to calculate the new checksum"
		exit 1
	fi
done