#!/usr/bin/env bash

#
# debuginfo
#
# Copyright (C) 2025 by Posit Software, PBC
#
# Unless you have received this program directly from Posit Software pursuant
# to the terms of a commercial license agreement with Posit Software, then
# this program is licensed to you under the terms of version 3 of the
# GNU Affero General Public License. This program is distributed WITHOUT
# ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
# MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
# AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
#

buildinfo_product=""
buildinfo_os=""
buildinfo_arch=""
buildinfo_version=""

bucket="rstudio-debug-symbols"
directory=""

usage () {

	cat <<- EOF
	Usage: $0 download [options]

	-C, --directory=<dir>
		Download and unpack symbols into this directory.
		Defaults to the current working directory.
	
	--product=<product>
		The product for which you'd like to download debug symbols.
		Defaults to "".
	
	--os=<os>
		The OS identifier associated with the debug symbols to be downloaded.
		Defaults to "".
	
	--arch=<arch>
		The architecture associated with the debug symbols to be downloaded.
		Defaults to "".
	
	--version=<version>
		The version of RStudio / Workbench associated with the debug symbols to be downloaded.
		Defaults to "".
	EOF

}

debuginfo-download () {

	# Validate all required variables are defined
	for var in buildinfo_product buildinfo_os buildinfo_arch buildinfo_version; do
		if [ -z "${!var}" ]; then
			echo "ERROR: ${var} is not defined; cannot proceed"
			exit 1
		fi
	done

	# Validate that the aws cli is available
	if ! command -v aws &> /dev/null; then
		echo "ERROR: The aws cli is not available; cannot proceed"
		exit 1
	fi

	# Move to directory if provided
	if [ -n "${directory}" ]; then
		mkdir -p "${directory}"
		cd "${directory}"
	fi

	# Download symbols from S3
	prefix="${buildinfo_product}-${buildinfo_os}-${buildinfo_arch}"
	src="s3://${bucket}/${buildinfo_version}/${prefix}.tar.xz"
	tgt="${prefix}.tar.xz"

	echo "-- Downloading ${src}"
	aws s3 cp "${src}" "${tgt}"

	# Unpack debug symbols here
	echo "-- Unpacking ${prefix.tar.xz}"
	tar xf "${prefix}.tar.xz"

}

while [ $# -gt 0 ]; do

	arg="$1"

	case "${arg}" in

	--help|help)
		usage
		exit 0
	;;

	-C)
		shift
		directory="$1"
	;;

	--directory=*)
		directory="${arg#--directory=}"
	;;

	--bucket=*)
		bucket="${arg#--bucket=}"
	;;

	--product=*)
		buildinfo_product="${arg#--product=}"
	;;

	--os=*)
		buildinfo_os="${arg#--os=}"
	;;

	--arch=*)
		buildinfo_arch="${arg#--arch=}"
	;;

	--version=*)
		buildinfo_version="${arg#--version=}"
	;;

	download)
		action="debuginfo-download"
	;;

	esac

	shift

done

case "${action}" in
	debuginfo-download) debuginfo-download ;;
	*) usage ;;
esac
