#!/bin/bash
set -euo pipefail

SERVICE="${1:?usage: deploy.sh <service> <image>}"
IMAGE="${2:?usage: deploy.sh <service> <image>}"
COMPOSE_DIR="/srv/compose/${SERVICE}"
OLD_CONTAINER="${SERVICE}_app_1"

cd "$COMPOSE_DIR"

echo "▶ Pulling $IMAGE"
docker pull "$IMAGE"

echo "▶ Starting new container"
IMAGE="$IMAGE" docker compose up -d --no-deps --scale app=2 app

echo "▶ Waiting for health check"
NEW_CONTAINER="${SERVICE}_app_2"
RETRIES=30
until docker inspect --format='{{.State.Health.Status}}' "$NEW_CONTAINER" 2>/dev/null | grep -q healthy; do
  RETRIES=$((RETRIES-1))
  if [ $RETRIES -le 0 ]; then
    echo "✗ Health check failed, rolling back"
    docker compose up -d --no-deps --scale app=1 app
    exit 1
  fi
  sleep 2
done

echo "▶ Stopping old container"
docker compose up -d --no-deps --scale app=1 app

echo "✓ Deployed $SERVICE"

./deploy.sh myapp myuser/myapp:v1.2.3