services:
  # =============================================
  # PostgreSQL Database
  # Primary persistent data store for tasks
  # =============================================
  postgres:
    image: postgres:16-alpine
    container_name: taskapp-postgres
    restart: unless-stopped
    environment:
      POSTGRES_DB: taskmanager
      POSTGRES_USER: taskuser
      POSTGRES_PASSWORD: taskpass
    volumes:
      - taskapp-pgdata:/var/lib/postgresql/data
      - ./db/init.sql:/docker-entrypoint-initdb.d/init.sql:ro
    networks:
      - backend-net
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U taskuser -d taskmanager"]
      interval: 10s
      timeout: 5s
      retries: 5
      start_period: 10s

  # =============================================
  # Redis Cache
  # Caching layer for API responses
  # =============================================
  redis:
    image: redis:7-alpine
    container_name: taskapp-redis
    restart: unless-stopped
    command: redis-server --appendonly yes
    volumes:
      - taskapp-redisdata:/data
    networks:
      - backend-net
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 10s
      timeout: 5s
      retries: 5
      start_period: 5s

  # =============================================
  # Node.js API Server
  # REST API for task CRUD operations
  # =============================================
  api:
    build:
      context: ./api
      dockerfile: Dockerfile
    container_name: taskapp-api
    restart: unless-stopped
    environment:
      PORT: 3000
      POSTGRES_HOST: postgres
      POSTGRES_PORT: 5432
      POSTGRES_DB: taskmanager
      POSTGRES_USER: taskuser
      POSTGRES_PASSWORD: taskpass
      REDIS_HOST: redis
      REDIS_PORT: 6379
    depends_on:
      postgres:
        condition: service_healthy
      redis:
        condition: service_healthy
    networks:
      - backend-net

  # =============================================
  # Nginx Frontend
  # Serves static files + reverse proxies to API
  # =============================================
  frontend:
    build:
      context: ./frontend
      dockerfile: Dockerfile
    container_name: taskapp-frontend
    restart: unless-stopped
    ports:
      - "5000:80"
    depends_on:
      - api
    networks:
      - frontend-net
      - backend-net

  # =============================================
  # Adminer
  # Web-based database management interface
  # =============================================
  adminer:
    image: adminer:latest
    container_name: taskapp-adminer
    restart: unless-stopped
    ports:
      - "5001:8080"
    environment:
      ADMINER_DEFAULT_SERVER: postgres
      ADMINER_DESIGN: dracula
    depends_on:
      postgres:
        condition: service_healthy
    networks:
      - frontend-net
      - backend-net

# =============================================
# Named Volumes (persistent storage)
# =============================================
volumes:
  taskapp-pgdata:
    name: taskapp-pgdata
  taskapp-redisdata:
    name: taskapp-redisdata

# =============================================
# Virtual Networks
# =============================================
networks:
  frontend-net:
    name: taskapp-frontend-net
    driver: bridge
  backend-net:
    name: taskapp-backend-net
    driver: bridge