#!/usr/bin/env bash

username="jonaswinkler";
reponame="paperless-ng";

output_dir="${1}";

###############################################################################

log_msg() {
	# echo "[github-get-releases] [${SECONDS}] $*" >&2;
	echo -e "[docker-images/paperless-ng] $*" >&2;
}

if [[ -z "${output_dir}" ]]; then
	echo "Error: No output directory specified.
paperless-ng build script

Usage:
	./paperless-ng.sh <path/to/preexisting_output_dir>" >&2;
	exit 0;
fi

if [[ ! -d "${output_dir}" ]]; then
	echo "Error: Output directory doesn't exist." >&2;
	exit 1;
fi


# $1 - Command name to check for
check_command() {
	which $1 >/dev/null 2>&1; exit_code=$?
	if [[ "${exit_code}" -ne 0 ]]; then
		log_msg "Error: Couldn't locate $1. Make sure it's installed and in your path.";
	fi
}

check_command mktemp;
check_command curl;
check_command jq;


temp_dir="$(mktemp --tmpdir -d "docker-images-paperless-ng-XXXXXXX")";
on_exit() {
	log_msg "Cleaning up";
	rm -rf "${temp_dir}";
	log_msg "Cleanup complete";
}
trap on_exit EXIT;

cd "${temp_dir}" || { echo "Failed to cd to temp dir"; exit 1; };

###############################################################################

###
# Step 1: Download and extract GitHub asset
###

release_json_url="https://api.github.com/repos/${username}/${reponame}/releases?per_page=1";
asset_urls="$(curl -sSL "${release_json_url}" | jq --raw-output '.[0].assets[] | [.name, .browser_download_url] | @tsv')";

while read -r filename url; do
	if [[ "${filename}" == *"docker"* ]]; then
		log_msg "Skipping docker compose definitions";
		continue;
	fi
	
	download_loc="paperless.tar.xz";
	curl -sSL -o "${download_loc}" "${url}";
	
	tar -xf "${download_loc}";
	rm "${download_loc}";
	
	cd "paperless-ng" || { echo "Failed to cd into extracted paperless-ng directory"; exit 1; };
	
	break;
done < <(echo "${asset_urls}");

###############################################################################

###
# Step 2: Build and push the docker image
###

# Note to self: All settings are environment variables, which are specified in
# the Nomad jobspec file

docker_tag="${IMAGEBUILDER_REGISTRY}/paperless-ng";

log_msg "Building docker image";
docker build --no-cache --pull --tag "${docker_tag}" .;
if [[ "$?" -ne 0 ]]; then
	log_msg "Error: docker build returned exit status $?";
fi

log_msg "Pushing docker image";
docker push "${docker_tag}";

log_msg "done";