#!/bin/bash
# Initiates the single-node replica set "rs0" if it does not exist yet and
# waits until the member is primary. Runs as a one-shot container.
set -euo pipefail

HOST="${MONGO_HOST:-al-mongo}"
PORT="${MONGO_PORT:-27017}"

echo "Waiting for MongoDB at ${HOST}:${PORT} ..."
until mongosh --host "${HOST}" --port "${PORT}" --quiet \
	--eval 'db.adminCommand({ ping: 1 }).ok' >/dev/null 2>&1; do
	sleep 2
done

if [ "$(mongosh --host "${HOST}" --port "${PORT}" --quiet \
	--eval 'try { rs.status().ok } catch (e) { 0 }')" != "1" ]; then
	echo "Initiating replica set rs0 ..."
	mongosh --host "${HOST}" --port "${PORT}" --quiet \
		--eval 'rs.initiate({ _id: "rs0", members: [{ _id: 0, host: "al-mongo:27017" }] })'
fi

echo "Waiting for primary ..."
until mongosh --host "${HOST}" --port "${PORT}" --quiet \
	--eval 'db.hello().isWritablePrimary' | grep -q true; do
	sleep 2
done

echo "Replica set rs0 is ready."