version: '2'

# Define services
services:
  # backend service
  app-server:
    image: petstore
    # Configuration for building the docker image for the backend service
    build:
      context: ./ # Use an image built from the specified dockerfile.
      dockerfile: Dockerfile
    ports:
      - "5000:5000" # Forward the exposed port 5000 on the container to port 5000 on the host machine
    restart: always
    depends_on: 
      - db 
          
    networks: # Networks to join 
      - backend
      - frontend

  # frontend service 
  app-client:
    build:
      context: pets # Use an image built from the specified dockerfile.
      dockerfile: Dockerfile
      args:
        REACT_APP_API_BASE_URL: localhost:3000
    ports:
      - "3000:3000" # Map the exposed port 3000 on the container to port 3000 on the host machine
    restart: always
    depends_on:
      - app-server
    networks:
      - frontend  

  # Database Service (Apache Derby)
  db:
    image: az82/docker-derby
    ports:
          - "1527:1527"
    restart: always
    
    networks:
      - backend  
  
# Volumes
volumes:
  db-data:

# Networks to be created to facilitate communication between containers
networks:
  backend:
  frontend: