services:
  redis:
    image: redis:7-alpine
    ports:
      - "6379:6379"
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 5s
      timeout: 3s
      retries: 10

  upstream:
    build:
      context: .
      dockerfile: upstream/Dockerfile
    environment:
      PORT: "3001"
      DELAY_MS: "500"
    ports:
      - "3001:3001"
    healthcheck:
      # /healthz never touches the upstream's call counter, so the number the
      # load demo reports is always real product fetches and never a probe.
      test: ["CMD", "wget", "-qO-", "http://localhost:3001/healthz"]
      interval: 5s
      timeout: 3s
      retries: 10

  api_1:
    build:
      context: .
      dockerfile: api/Dockerfile
    environment:
      REDIS_URL: "redis://redis:6379"
      UPSTREAM_URL: "http://upstream:3001"
      PORT: "3000"
      TTL_MS: "10000"
      INSTANCE_ID: "api_1"
    depends_on:
      redis:
        condition: service_healthy
      upstream:
        condition: service_healthy

  api_2:
    build:
      context: .
      dockerfile: api/Dockerfile
    environment:
      REDIS_URL: "redis://redis:6379"
      UPSTREAM_URL: "http://upstream:3001"
      PORT: "3000"
      TTL_MS: "10000"
      INSTANCE_ID: "api_2"
    depends_on:
      redis:
        condition: service_healthy
      upstream:
        condition: service_healthy

  api_3:
    build:
      context: .
      dockerfile: api/Dockerfile
    environment:
      REDIS_URL: "redis://redis:6379"
      UPSTREAM_URL: "http://upstream:3001"
      PORT: "3000"
      TTL_MS: "10000"
      INSTANCE_ID: "api_3"
    depends_on:
      redis:
        condition: service_healthy
      upstream:
        condition: service_healthy

  nginx:
    image: nginx:alpine
    ports:
      - "3000:80"
    volumes:
      - ./nginx/nginx.conf:/etc/nginx/conf.d/default.conf:ro
    depends_on:
      - api_1
      - api_2
      - api_3