dr-asadian/src/lib/seo.ts

import type { Metadata } from "next";

import { site } from "@/data/site";
import { websiteDomain } from "@/lib/config";

export const siteUrl = `https://${websiteDomain}`;

export function clipMetaDescription(text: string, max = 158) {
  const clean = text.replace(/\s+/g, " ").trim();
  if (clean.length <= max) return clean;
  const cut = clean.slice(0, max - 1);
  const lastSpace = cut.lastIndexOf(" ");
  return `${(lastSpace > 80 ? cut.slice(0, lastSpace) : cut).trim()}…`;
}

export function pageTitle(title: string, path = "/") {
  if (path === "/" || title.includes(site.doctorName) || title.includes(site.name)) {
    return title;
  }
  return `${title} | ${site.doctorName}`;
}

export function pageMetadata({
  title,
  description,
  path = "/",
  image,
}: {
  title: string;
  description: string;
  path?: string;
  image?: string | null;
}): Metadata {
  const url = `${siteUrl}${path.startsWith("/") ? path : `/${path}`}`;
  const fullTitle = pageTitle(title, path);
  const metaDescription = clipMetaDescription(description);
  const ogImage = image || `${siteUrl}/images/logo.png`;
  const isDetail = path.split("/").filter(Boolean).length > 1;

  return {
    title: { absolute: fullTitle },
    description: metaDescription,
    robots: { index: true, follow: true },
    alternates: { canonical: url },
    openGraph: {
      type: isDetail ? "article" : "website",
      locale: "fa_IR",
      url,
      siteName: site.name,
      title: fullTitle,
      description: metaDescription,
      images: [{ url: ogImage, alt: fullTitle }],
    },
    twitter: {
      card: "summary_large_image",
      title: fullTitle,
      description: metaDescription,
      images: [ogImage],
    },
  };
}