import type { Metadata } from "next";
import Link from "next/link";
import type { ReactNode } from "react";
import {
  buildLegalSyntheticPost,
  type LegalDocumentMessages,
  type LegalDocumentSlug,
} from "../../../lib/legalSyntheticPost";
import ContentBanner from "../../components/sections/ContentBanner";

type LegalDocumentPageProps = {
  slug: LegalDocumentSlug;
  path: string;
  page: LegalDocumentMessages;
};

const INLINE_LINK = /\[([^\]]+)\]\(([^)]+)\)/g;

const ARTICLE_COLUMN_CLASS =
  "mx-auto flex w-full flex-col gap-[var(--space-800,32px)] text-[var(--color-content-default-primary)] text-medium-paragraph sm:max-w-[390px] sm:text-large-paragraph md:max-w-[472px] lg:max-w-[700px] lg:text-x-large-paragraph xl:max-w-[904px] xl:text-xx-large-paragraph";

const LINK_CLASS = "underline decoration-solid underline-offset-2";

function isSafeHref(href: string): boolean {
  return (
    (href.startsWith("/") && !href.startsWith("//")) ||
    href.startsWith("https://") ||
    href.startsWith("http://") ||
    href.startsWith("mailto:")
  );
}

function LegalInlineText({ text }: { text: string }) {
  const nodes: ReactNode[] = [];
  let lastIndex = 0;
  let key = 0;

  for (const match of text.matchAll(INLINE_LINK)) {
    const matchIndex = match.index ?? 0;
    if (matchIndex > lastIndex) {
      nodes.push(text.slice(lastIndex, matchIndex));
    }

    const label = match[1];
    const href = match[2];
    if (isSafeHref(href)) {
      const isInternal = href.startsWith("/") && !href.startsWith("//");
      nodes.push(
        isInternal ? (
          <Link key={key} href={href} className={LINK_CLASS}>
            {label}
          </Link>
        ) : (
          <a key={key} href={href} className={LINK_CLASS}>
            {label}
          </a>
        ),
      );
      key += 1;
    } else {
      nodes.push(label);
    }

    lastIndex = matchIndex + match[0].length;
  }

  if (lastIndex < text.length) {
    nodes.push(text.slice(lastIndex));
  }

  return nodes;
}

export function legalPageMetadata(
  meta: { title: string; description: string; keywords: string[] },
  page: { banner: { title: string; description: string } },
): Metadata {
  return {
    title: meta.title,
    description: meta.description,
    keywords: meta.keywords,
    openGraph: {
      title: page.banner.title,
      description: page.banner.description,
      type: "website",
      siteName: "CommunityRule",
    },
  };
}

/**
 * Public legal documents (`/privacy`, `/terms`, `/cookies`).
 *
 * Figma: "Content page Template" (19003:23305) — ContentBanner guide
 * (22078:806964) + article column (19003:23574). Body stacks follow
 * Type / Text Block (22001:29793): heading + paragraphs. Omits Related
 * articles, Ask Organizer, and decorative shapes.
 * https://www.figma.com/design/agv0VBLiBlcnSAaiAORgPR/Community-Rule-System?node-id=19003-23305
 */
export default function LegalDocumentPage({
  slug,
  path,
  page,
}: LegalDocumentPageProps) {
  const post = buildLegalSyntheticPost(slug, page);

  const structuredData = {
    "@context": "https://schema.org",
    "@type": "WebPage",
    name: page.banner.title,
    description: page.banner.description,
    url: `https://communityrule.com${path}`,
    dateModified: page.banner.date,
    publisher: {
      "@type": "Organization",
      name: "CommunityRule",
      url: "https://communityrule.com",
    },
  };

  const breadcrumbData = {
    "@context": "https://schema.org",
    "@type": "BreadcrumbList",
    itemListElement: [
      {
        "@type": "ListItem",
        position: 1,
        name: "Home",
        item: "https://communityrule.com",
      },
      {
        "@type": "ListItem",
        position: 2,
        name: page.banner.title,
        item: `https://communityrule.com${path}`,
      },
    ],
  };

  return (
    <>
      <script
        type="application/ld+json"
        dangerouslySetInnerHTML={{
          __html: JSON.stringify(structuredData),
        }}
      />
      <script
        type="application/ld+json"
        dangerouslySetInnerHTML={{
          __html: JSON.stringify(breadcrumbData),
        }}
      />

      <div className="relative min-h-screen overflow-x-hidden bg-transparent">
        <ContentBanner post={post} variant="guide" />

        <article
          className="relative z-10 p-[var(--spacing-scale-024)] sm:py-[var(--spacing-scale-032)]"
          data-node-id="19003:23574"
        >
          <div className={`${ARTICLE_COLUMN_CLASS} -mt-[var(--spacing-scale-048)]`}>
            <div
              className="flex flex-wrap items-end gap-[var(--measures-spacing-008,8px)] text-xx-small-paragraph text-[var(--color-content-default-secondary)] md:text-x-small-paragraph lg:text-small-paragraph xl:text-large-paragraph"
              data-name="Metadata Container"
            >
              <span>{page.banner.author}</span>
              <span>{page.updated}</span>
            </div>

            {page.intro.length > 0 ? (
              <div className="flex flex-col gap-[1em]">
                {page.intro.map((paragraph) => (
                  <p key={paragraph}>
                    <LegalInlineText text={paragraph} />
                  </p>
                ))}
              </div>
            ) : null}

            {page.sections.map((section) => (
              <section
                key={section.heading}
                className="flex w-full flex-col gap-[var(--space-200,8px)]"
                data-name="TextBlock"
              >
                <h2 className="w-full font-bold">{section.heading}</h2>
                <div className="flex flex-col gap-[1em]">
                  {section.paragraphs.map((paragraph) => (
                    <p key={paragraph}>
                      <LegalInlineText text={paragraph} />
                    </p>
                  ))}
                </div>
              </section>
            ))}
          </div>
        </article>
      </div>
    </>
  );
}