#!/usr/bin/env bash

set -eu -o pipefail
verbose='y' # we test for (non)emptiness
quiet='' # we test for (non)emptiness

source lib.sh

if [ "$#" -ne 1 ]; then
	abort "Usage: $0 repositoryName"
fi

info "BEWARE that this script can't garbage collect no longer existing snapshots yet"

restic() { command restic --no-cache "$@"; }
repoName="$1"
checkPathComponent "$repoName"
repoFile="repos/$repoName"
if [ ! -f "$repoFile" ]; then
	abort "Repository $repoName does not exist"
fi
repoType="$(< "$repoFile" jq --raw-output .type)"

if [ "$repoType" = "restic" ]; then
	repoPath="$(< "$repoFile" jq --raw-output '."restic-path"')"
	info "Inspecting repository $repoName"
	snapshots="$(restic -r "$repoPath" snapshots --json)"
	len="$(echo "$snapshots" | jq '. | length')"
	i=0
	while [ "$i" -lt "$len" ]; do
		snapshot="$(echo "$snapshots" | jq ".[$i]")"
		id="$(echo "$snapshot" | jq --raw-output '.id')"
		checkPathComponent "$id"
		snapshotFile="backups/$repoName/$id"
		if [ -f "$snapshotFile" ]; then
			verbose "Snapshot $id is already known"
		else
			info "Found new snapshot $id"
			mkdir -p "backups/$repoName"
			echo "$snapshot" | jq --sort-keys --tab '. | pick(.hostname, .id, .paths, .tags, .time)' > "$snapshotFile"
		fi
		i=$(("$i"+1))
	done
	info "Processed $len snapshots"
else
	abort "Unsupported repository type $repoType"
fi