#Docker 部署全流程：Dockerfile 与 Docker Compose 编排

# docker-compose.yml
version: "3.9" # 稳定常用的版本

services: # 定义所有容器
  # Flask Web 服务
  web:
    build: . # 基于当前目录的 Dockerfile 构建镜像
    container_name: daoman_web # 自定义容器名，方便 exec/logs
    ports:
      - "8000:8000" # 宿主机8000 → 容器8000
    environment: # 开发环境变量
      - FLASK_ENV=development
      - DATABASE_URL=postgresql://postgres:postgres@db:5432/daoman
      - REDIS_URL=redis://redis:6379/0
    volumes: # 挂载本地代码到容器，实现热重载
      - ./app:/app
    depends_on: # 依赖关系：web 必须等 db 和 redis 健康/启动后再启动
      db:
        condition: service_healthy
      redis:
        condition: service_started
    command: flask run --host=0.0.0.0 # 覆盖 Dockerfile 的 CMD，用开发服务器

  # PostgreSQL 数据库
  db:
    image: postgres:16-alpine # 同样选轻量的 alpine 版
    container_name: daoman_db
    environment: # 初始化数据库的默认配置
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: daoman
    volumes: # 数据持久化：挂载到宿主机的 Docker 卷（不是本地目录）
      - postgres_data:/var/lib/postgresql/data
    healthcheck: # 健康检查：只有数据库能连了才叫健康
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 5s
      timeout: 5s
      retries: 5

  # Redis 缓存/消息队列
  redis:
    image: redis:7-alpine
    container_name: daoman_redis

  # Celery 异步任务 Worker
  celery:
    build: .
    container_name: daoman_celery
    command: celery -A app.celery_app worker --loglevel=info
    environment:
      - DATABASE_URL=postgresql://postgres:postgres@db:5432/daoman
      - REDIS_URL=redis://redis:6379/0
    depends_on:
      - db
      - redis

volumes: # 声明宿主机的 Docker 卷，跨容器重启数据不会丢
  postgres_data:

# docker-compose.prod.yml
version: "3.9"

services:
  # Flask Web 服务
  web:
    image: daoman/flask:latest # 直接用预构建的镜像（比如 Docker Hub 或私有仓库的）
    container_name: daoman_web
    restart: always # 崩溃、重启宿主机后自动启动
    env_file: # 读取单独的生产环境变量
      - .env.production
    depends_on:
      db:
        condition: service_healthy
      redis:
        condition: service_started
    healthcheck: # Web 服务健康检查：访问 /health 接口，确保服务正常
      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
      interval: 30s
      timeout: 10s
      retries: 3

  # PostgreSQL 数据库
  db:
    image: postgres:16-alpine
    restart: always
    volumes:
      - postgres_prod:/var/lib/postgresql/data
    env_file:
      - .env.production

  # Redis 缓存/消息队列
  redis:
    image: redis:7-alpine
    restart: always
    command: redis-server --appendonly yes # 开启 AOF 持久化，数据更安全
    volumes:
      - redis_prod:/data

  # Nginx 反向代理
  nginx:
    image: nginx:alpine
    restart: always
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro # ro = 只读，安全
      - ./nginx/ssl:/etc/nginx/ssl:ro
      - static_files:/var/www/static # 挂载 Web 服务的静态文件目录
    depends_on:
      - web

volumes:
  postgres_prod:
  redis_prod:
  static_files: