package service

import (
	"net"
	"net/url"
	"strings"
)

// NormalizeSiteDomain 接受域名、主机名或完整 URL，统一为小写主机名。
func NormalizeSiteDomain(raw string) string {
	raw = strings.TrimSpace(strings.ToLower(raw))
	if raw == "" {
		return ""
	}
	if !strings.Contains(raw, "://") {
		raw = "https://" + raw
	}
	parsed, err := url.Parse(raw)
	if err != nil {
		return ""
	}
	host := strings.TrimSuffix(parsed.Hostname(), ".")
	if host == "" {
		return ""
	}
	if ip := net.ParseIP(host); ip == nil && !strings.Contains(host, ".") && host != "localhost" {
		return ""
	}
	return host
}

func PageHost(rawURL string) string {
	parsed, err := url.Parse(strings.TrimSpace(rawURL))
	if err != nil {
		return ""
	}
	return strings.TrimSuffix(strings.ToLower(parsed.Hostname()), ".")
}

// SiteDomainMatches 同时兼容带 www 与不带 www 的主机名。
func SiteDomainMatches(siteDomain, pageURL string) bool {
	expected := NormalizeSiteDomain(siteDomain)
	actual := PageHost(pageURL)
	if expected == "" || actual == "" {
		return expected == ""
	}
	return strings.TrimPrefix(expected, "www.") == strings.TrimPrefix(actual, "www.")
}