docker-compose.yaml

services:
  # 1. Database Service (PostgreSQL)
  db:
    image: postgres:15-alpine
    volumes:
      - postgres_data:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=${DB_NAME}
      - POSTGRES_USER=${DB_USER}
      - POSTGRES_PASSWORD=${DB_PASSWORD}
    ports:
      - "5432:5432" # Exposed for local development
    networks:
      - main_network
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U ${DB_USER} -d ${DB_NAME}"]
      interval: 5s
      timeout: 5s
      retries: 5

  # 2. Redis Service (Cache & WebSockets Layer)
  redis:
    image: redis:7-alpine
    ports:
      - "6379:6379" # Exposed so you can inspect it locally if needed
    networks:
      - main_network

  # 3. pgAdmin (Database UI)
  pgadmin:
    image: dpage/pgadmin4:latest
    environment:
      - PGADMIN_DEFAULT_EMAIL=${PGADMIN_EMAIL:-admin@admin.com}
      - PGADMIN_DEFAULT_PASSWORD=${PGADMIN_PASSWORD:-admin}
      - PGADMIN_CONFIG_SERVER_MODE=False
      - PGADMIN_CONFIG_MASTER_PASSWORD_REQUIRED=False
    ports:
      - "5050:80"
    volumes:
      - pgadmin_data:/var/lib/pgadmin
    depends_on:
      - db
    networks:
      - main_network

  # 4. Backend Service (Django)
  backend:
    build: ./backend
    command: daphne -b 0.0.0.0 -p 8000 config.asgi:application
    volumes:
      - ./backend:/app # Hot-reloading: changes in local folder reflect in container
    ports:
      - "8000:8000"
    env_file:
      - .env
    environment:
      - DB_HOST=db
      - REDIS_HOST=redis
    depends_on:
      db:
        condition: service_healthy
      redis:
        condition: service_started
    networks:
      - main_network

  # 5. Frontend Service (React + Vite)
  frontend:
    build: ./frontend
    volumes:
      - ./frontend:/app
      - /app/node_modules # Prevents local node_modules from overwriting container's
    ports:
      - "5173:5173"
    environment:
      - VITE_API_URL=http://localhost:8000
      - VITE_WS_URL=ws://localhost:8000
    depends_on:
      - backend
    networks:
      - main_network

volumes:
  postgres_data: # Persist DB data even if containers are destroyed
  pgadmin_data: # Persist pgAdmin settings and server configurations

networks:
  main_network:
    driver: bridge