package utils

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

func ClientIP(r *http.Request) string {
	if xff := r.Header.Get("X-Forwarded-For"); xff != "" {
		parts := strings.Split(xff, ",")
		if len(parts) > 0 {
			return strings.TrimSpace(parts[0])
		}
	}

	if ip := r.Header.Get("X-Real-IP"); ip != "" {
		return ip
	}

	// RemoteAddr: IP:port
	host, _, err := net.SplitHostPort(r.RemoteAddr)
	if err == nil {
		return host
	}

	return r.RemoteAddr
}