#!/usr/bin/env zsh
set -e
echo "pulling latest build image..."
docker compose pull

# Check which service is running
if docker compose ps blog-blue --filter "status=running" -q | grep -q .; then
	CURRENT="blog-blue"
	TARGET="blog-green"
else
	CURRENT="blog-green"
	TARGET="blog-blue"
fi

echo "Current: $CURRENT -> deploying Target: $TARGET"

# TODO dont run if 0 instances running
# Scale current deployment to two instances, keeping the old one and adding a running env of the new one
docker compose up -d --no-deps $TARGET

echo "waiting for $TARGET to pass healthcheck..."
# docker ps --filter 'label=com.docker.compose.service=blog' --filter 'health=starting'
until [[ "$(docker inspect --format '{{.State.Health.Status}}' $(docker compose ps -q $TARGET) 2>/dev/null)" == "healthy" ]]; do
	sleep 1
done

# Give traefik backend a few seconds to update
sleep 3

echo "Stopping $CURRENT..."
docker compose stop $CURRENT
docker compose rm -f $CURRENT

echo "Zero downtime deployment to $TARGET complete."
# TODO zero downtime deployment
# TODO run on a cron job