import { getHeader, getRequestIP } from 'h3'

/**
 * 还原真实客户端 IP。
 * 优先级：CF-Connecting-IP > X-Real-IP > X-Forwarded-For(首段) > 连接地址
 * 适用于多层反代（Cloudflare / Nginx / 负载均衡）场景。
 */
export function getRealClientIp(event: any): string {
  const cf = getHeader(event, 'cf-connecting-ip')
  if (cf) return String(cf).split(',')[0].trim()

  const real = getHeader(event, 'x-real-ip')
  if (real) return String(real).split(',')[0].trim()

  const xff = getHeader(event, 'x-forwarded-for')
  if (xff) return String(xff).split(',')[0].trim()

  return getRequestIP(event, { xForwardedFor: false }) || '0.0.0.0'
}