package httputil

import (
	"net"
	"net/http"
	"strings"
)

func ClientIP(r *http.Request) string {
	if xff := r.Header.Get("X-Forwarded-For"); xff != "" {
		if ip := strings.TrimSpace(strings.Split(xff, ",")[0]); ip != "" {
			return ip
		}
	}
	if xri := strings.TrimSpace(r.Header.Get("X-Real-IP")); xri != "" {
		return xri
	}
	if host, _, err := net.SplitHostPort(r.RemoteAddr); err == nil {
		return host
	}
	return r.RemoteAddr
}

func ValidIP(ip string) (string, bool) {
	parsed := net.ParseIP(strings.TrimSpace(ip))
	if parsed == nil {
		return "", false
	}
	return parsed.String(), true
}