#!/bin/bash

#############################
#  PACKAGE UPDATING HELPER  #
#############################

# This script is meant to be run by GitHub actions: check .github/workflows/updater.yml
# Since each app is different, maintainers can adapt its contents
# so as to perform automatic actions when a new upstream release is detected.

# The ASSETS environment variable is a space-separated list of urls
# of assets published with the latest upstream release.
# Let's convert it into an array.
eval "ASSETS=($ASSETS)"
echo "${#ASSETS[@]} available asset(s)"

# Let's loop over the array of assets URLs
for asset_url in ${ASSETS[@]}; do

	echo "Handling asset at $asset_url"

	# Assign the asset to a source file in conf/ directory
	# Leave $src empty to ignore the asset
	case $asset_url in
		*"admin"*)
			src="app"
			;;
		*"update"*)
			src="app-upgrade"
			;;
		*)
			src=""
		;;
	esac

	# If $src is not empty, let's process the asset
	if [ ! -z "$src" ]; then

		# Create the temporary directory
		tempdir="$(mktemp -d)"

		# Download sources and calculate checksum
		filename=${asset_url##*/}
		curl --silent -4 -L $asset_url -o "$tempdir/$filename"
		checksum=$(sha256sum "$tempdir/$filename" | head -c 64)

		# Delete temporary directory
		rm -rf $tempdir

		# Get extension
		if [[ $filename == *.tar.gz ]]; then
			extension=tar.gz
		else
			extension=${filename##*.}
		fi

		# Rewrite source file
		cat <<EOT > conf/$src.src
SOURCE_URL=$asset_url
SOURCE_SUM=$checksum
SOURCE_SUM_PRG=sha256sum
SOURCE_FORMAT=$extension
SOURCE_IN_SUBDIR=true
SOURCE_FILENAME=
SOURCE_EXTRACT=true
EOT
		echo "... conf/$src.src updated"

	else
		echo "... asset ignored"
	fi

done
echo "Done!"