events { worker_connections 1024; }

http {
    upstream backend {
        server backend:8000;
    }

    # HTTP → HTTPS 重定向
    server {
        listen 80;
        server_name _;
        
        # Let's Encrypt 验证路径
        location /.well-known/acme-challenge/ {
            root /var/www/certbot;
        }
        
        # 其他请求重定向到 HTTPS
        location / {
            return 301 https://$host$request_uri;
        }
    }

    # HTTPS
    server {
        listen 443 ssl http2;
        server_name _;

        # SSL 证书（Let's Encrypt）
        # 注意：在生产环境中，需要将证书路径挂载到容器中
        # ssl_certificate /etc/letsencrypt/live/your-domain.com/fullchain.pem;
        # ssl_certificate_key /etc/letsencrypt/live/your-domain.com/privkey.pem;
        
        # 临时自签名证书（仅用于测试，生产环境必须使用 Let's Encrypt）
        # ssl_certificate /etc/nginx/ssl/cert.pem;
        # ssl_certificate_key /etc/nginx/ssl/key.pem;
        
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers on;

        # /api -> backend
        location /api/ {
            proxy_pass http://backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_read_timeout 30s;
            proxy_connect_timeout 10s;
        }

        # 健康检查
        location /health {
            proxy_pass http://backend/health;
            access_log off;
        }
    }
}