#!/usr/bin/env bash
##
##  Package update helper script which sets new SHA-256 for source bundle.
##
##  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 "Usage: update-checksum [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 "${@}"; do
	buildsh_path=
	repo=
	if [ -d "${package}" ] && [ -f "${package}/build.sh" ]; then
		buildsh_path="${package}/build.sh"
		package=$(basename ${package})
	else
		for repo_path in $(jq --raw-output 'del(.pkg_format) | keys | .[]' $REPO_ROOT/repo.json); do
			if [ -d "${repo_path}/${package}" ] && [ -f "${repo_path}/${package}/build.sh" ]; then
				repo=$(jq --raw-output '.["'$repo_path'"].name' $REPO_ROOT/repo.json)
				repo=${repo#"termux-"}
				buildsh_path="${repo_path}/${package}/build.sh"
				package=$(basename ${package})
			fi
		done
	fi

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

	# Command substitution create a subshell, we want to do this
	# to not effect the main scope's variables by sourcing the build script
	new_checksum=($(
		source "${buildsh_path}" 2>/dev/null
		for url in "${TERMUX_PKG_SRCURL[@]}"; do
			echo "Downloading ${url}" >&2
			dl_tmpdir=$(mktemp -d "${TMPDIR-/tmp}/termux.src.dl.XXXXXXXX")

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

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

				rm -rf "${dl_tmpdir}"
			fi
		done
	))

	if (( ${#new_checksum[@]} )); then
		# Replace old SHA-256.
		if (( ${#new_checksum[@]} > 1 )); then
			checksum="(\n$(printf '\\t%s\\n' "${new_checksum[@]}"))"
		else
			checksum="${new_checksum[0]}"
		fi
		if grep -qPz "TERMUX_PKG_SHA256=\([^)]*\)" "${buildsh_path}"; then
			sed -zi "s/\(TERMUX_PKG_SHA256=\)([^)]*)/\1${checksum}/g" "${buildsh_path}"
		else
			sed -i "s/\(TERMUX_PKG_SHA256=\).*/\1${checksum}/g" "${buildsh_path}"
		fi

		# 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 ${IS_GIT_REPOSITORY}; then
			echo
			echo "You are about to commit these changes:"
			echo
			echo "--------------------"
			git --no-pager diff --patch "${buildsh_path}"
			echo "--------------------"
			echo
			echo "bump(${repo}/${package}): $(. "${buildsh_path}"; echo "${TERMUX_PKG_VERSION}" | cut -d: -f2-)"
			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 "bump(${repo}/${package}): $(. "${buildsh_path}"; echo "${TERMUX_PKG_VERSION}" | cut -d: -f2-)"
			else
				echo "Not committing to Git!"
			fi
			echo
		fi
	else
		echo
		echo "${package}: failed to calculate the new checksum"
		exit 1
	fi
done