server {
    listen 80;
    server_name localhost;

    # 日志配置
    access_log /var/log/nginx/dianshang_access.log;
    error_log /var/log/nginx/dianshang_error.log;

    # 客户端上传文件大小限制
    client_max_body_size 10M;

    # API 接口代理
    location /api/ {
        proxy_pass http://server:8080;
        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;
        
        # 超时设置
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
        
        # 缓冲设置
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 8 4k;
    }

    # 健康检查
    location /health {
        proxy_pass http://server:8080;
        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;
    }

    # 静态文件服务
    location /static/ {
        alias /var/www/static/;
        expires 30d;
        add_header Cache-Control "public, immutable";
    }

    # 上传文件服务
    location /uploads/ {
        alias /var/www/uploads/;
        expires 7d;
        add_header Cache-Control "public";
    }

    # 默认页面
    location / {
        return 200 '{"message": "Dianshang API Server is running"}';
        add_header Content-Type application/json;
    }

    # 错误页面
    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    
    location = /50x.html {
        return 500 '{"error": "Internal Server Error"}';
        add_header Content-Type application/json;
    }
    
    location = /404.html {
        return 404 '{"error": "Not Found"}';
        add_header Content-Type application/json;
    }
}

# HTTPS 配置（可选）
# server {
#     listen 443 ssl http2;
#     server_name your-domain.com;
# 
#     ssl_certificate /etc/nginx/ssl/cert.pem;
#     ssl_certificate_key /etc/nginx/ssl/key.pem;
#     ssl_session_timeout 1d;
#     ssl_session_cache shared:SSL:50m;
#     ssl_session_tickets off;
# 
#     ssl_protocols TLSv1.2 TLSv1.3;
#     ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384;
#     ssl_prefer_server_ciphers off;
# 
#     add_header Strict-Transport-Security "max-age=63072000" always;
# 
#     location / {
#         proxy_pass http://server:8080;
#         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;
#     }
# }