#!/usr/bin/env bash
set -e -u
BASEDIR=$(dirname "$(realpath "$0")")

# These variables should be set in environment outside of this script.
# Build updated packages.
: "${BUILD_PACKAGES:=false}"
# Commit changes to Git.
: "${GIT_COMMIT_PACKAGES:=false}"
# Push changes to remote.
: "${GIT_PUSH_PACKAGES:=false}"

if [ -z "${GITHUB_API_TOKEN-}" ]; then
	echo "You need a Github Personal Access Token be set in variable GITHUB_API_TOKEN."
	exit 1
fi

if [ -f "${BASEDIR}/github-projects.txt" ]; then
	for line in $(grep -P '^[a-z0-9]' "${BASEDIR}/github-projects.txt"); do
		unset package project version_regexp termux_version termux_epoch latest_version
		package=$(echo "$line" | cut -d'|' -f1)
		project=$(echo "$line" | cut -d'|' -f2)
		version_regexp=$(echo "$line" | cut -d'|' -f3-)

		if [ ! -d "${BASEDIR}/../../packages/${package}" ]; then
			echo "Package '$package' is not available, skipping."
			continue
		fi

		# Our local version of package.
		termux_version=$(set +e +u;. "${BASEDIR}/../../packages/${package}/build.sh" 2>/dev/null; echo "$TERMUX_PKG_VERSION")
		termux_epoch="$(echo "$termux_version" | cut -d: -f1)"
		termux_version=$(echo "$termux_version" | cut -d: -f2-)
		if [ "$termux_version" == "$termux_epoch" ]; then
			# No epoch set.
			termux_epoch=""
		else
			termux_epoch+=":"
		fi

		# Latest version is the current release tag on Github.
		latest_version=$(curl --silent --location -H "Authorization: token ${GITHUB_API_TOKEN}" "https://api.github.com/repos/${project}/releases/latest" | jq -r .tag_name)

		# Remove leading 'v' which is common in version tag.
		latest_version=${latest_version#v}

		# If needed, filter version numbers from tag by using regexp.
		if [ -n "$version_regexp" ]; then
			latest_version=$(grep -oP "$version_regexp" <<< "$latest_version")
		fi

		# Translate "_" into ".".
		latest_version=${latest_version//_/.}

		# We have no better choice for comparing versions.
		if [ "$(echo -e "${termux_version}\n${latest_version}" | sort -V | head -n 1)" != "$latest_version" ] ;then
			if [ "$BUILD_PACKAGES" = "false" ]; then
				echo "Package '${package}' needs update to '${latest_version}'."
			else
				echo "Updating '${package}' to '${latest_version}'."
				sed -i "s/^\(TERMUX_PKG_VERSION=\)\(.*\)\$/\1${termux_epoch}${latest_version}/g" "${BASEDIR}/../../packages/${package}/build.sh"
				sed -i "/TERMUX_PKG_REVISION=/d" "${BASEDIR}/../../packages/${package}/build.sh"
				echo n | "${BASEDIR}/../bin/update-checksum" "$package" || {
					echo "Failed to update checksum for '${package}', skipping..."
					git checkout -- "${BASEDIR}/../../packages/${package}"
					git pull --rebase
					continue
				}

				echo "Trying to build package '${package}'."
				if "${BASEDIR}/../run-docker.sh" ./build-package.sh -a aarch64 -I "$package" && \
					"${BASEDIR}/../run-docker.sh" ./build-package.sh -a arm -I "$package"; then
					if [ "$GIT_COMMIT_PACKAGES" = "true" ]; then
						git add "${BASEDIR}/../../packages/${package}"
						git commit -m "$(echo -e "${package}: update to ${latest_version}\n\nThis commit has been automatically submitted by Github Actions.")"
					fi

					if [ "$GIT_PUSH_PACKAGES" = "true" ]; then
						git pull --rebase
						git push
					fi
				else
					echo "Failed to build '${package}'."
					git checkout -- "${BASEDIR}/../../packages/${package}"
				fi
			fi
		fi
	done
fi