import type { H3Event } from 'h3'

/**
 * 클라이언트 IP 주소 가져오기
 */
export function getClientIp(event: H3Event): string {
  // 프록시/로드밸런서 뒤에 있을 경우
  const xForwardedFor = getHeader(event, 'x-forwarded-for')
  if (xForwardedFor) {
    return xForwardedFor.split(',')[0].trim()
  }
  
  const xRealIp = getHeader(event, 'x-real-ip')
  if (xRealIp) {
    return xRealIp
  }
  
  // 직접 연결
  const remoteAddress = event.node.req.socket?.remoteAddress
  if (remoteAddress) {
    // IPv6 localhost를 IPv4로 변환
    if (remoteAddress === '::1' || remoteAddress === '::ffff:127.0.0.1') {
      return '127.0.0.1'
    }
    // IPv6 매핑된 IPv4 주소 처리
    if (remoteAddress.startsWith('::ffff:')) {
      return remoteAddress.substring(7)
    }
    return remoteAddress
  }
  
  return 'unknown'
}