import type { Metadata } from "next";
import Link from "next/link";
import { notFound } from "next/navigation";
import { ContentPageShell } from "@/components/ContentPageShell";
import { HtmlContent } from "@/components/HtmlContent";
import { PortfolioGallery } from "@/components/PortfolioGallery";
import { PortfolioProjectLink } from "@/components/PortfolioProjectLink";
import {
  categoryLabelFa,
  findPortfolioCategory,
  getRootCategories,
  portfolioCategoryHref,
  topPortfolioCategories,
  type PortfolioCategory,
} from "@/data/portfolioCategories";
import {
  ApiNotFoundError,
  formatFaDate,
  getPortfolio,
  getPortfolioCategories,
  getPortfolioCoverImage,
} from "@/lib/api";

type PortfolioDetailPageProps = {
  params: Promise<{ slug: string }>;
};

function mapApiCategories(
  items: Awaited<ReturnType<typeof getPortfolioCategories>>,
): PortfolioCategory[] {
  return items.map((item) => ({
    id: String(item.id),
    slug: item.slug,
    nameEn: item.name,
    nameFa: item.nameFa || item.name,
    parentId: item.parentId,
    sortOrder: item.sortOrder ?? 0,
  }));
}

function findRootForCategory(
  categoryId: string | number | null | undefined,
  categories: PortfolioCategory[],
): PortfolioCategory | undefined {
  if (categoryId == null) return undefined;
  let current = categories.find((c) => c.id === String(categoryId));
  if (!current) return undefined;

  while (current?.parentId) {
    const parent = categories.find((c) => c.id === String(current?.parentId));
    if (!parent) break;
    current = parent;
  }

  return current;
}

export async function generateMetadata({
  params,
}: PortfolioDetailPageProps): Promise<Metadata> {
  const { slug } = await params;

  try {
    const portfolio = await getPortfolio(slug);
    const title = portfolio.titleFa || portfolio.title;
    return {
      title: `${title} | مشکی`,
      description: portfolio.abstract ?? undefined,
    };
  } catch {
    return { title: "نمونه‌کار | مشکی" };
  }
}

export default async function PortfolioDetailPage({
  params,
}: PortfolioDetailPageProps) {
  const { slug } = await params;

  let portfolio;
  try {
    portfolio = await getPortfolio(slug);
  } catch (error) {
    if (error instanceof ApiNotFoundError) notFound();
    throw error;
  }

  const cover = getPortfolioCoverImage(portfolio);
  const date = formatFaDate(portfolio.publishedAt);
  const title = portfolio.titleFa || portfolio.title;

  let allCategories: PortfolioCategory[] = topPortfolioCategories;
  try {
    allCategories = mapApiCategories(await getPortfolioCategories());
  } catch {
    allCategories = topPortfolioCategories;
  }

  const categoryFa = categoryLabelFa(portfolio.categoryName, allCategories);
  const rootCategory =
    findRootForCategory(portfolio.categoryId, allCategories) ??
    findPortfolioCategory(portfolio.categoryName, getRootCategories(allCategories));
  const gallery = (portfolio.gallery ?? []).filter(
    (item) => item.url !== cover,
  );

  const titleEn =
    portfolio.titleEn ??
    (portfolio.titleFa && portfolio.title !== portfolio.titleFa
      ? portfolio.title
      : null);
  const categoryHref = rootCategory
    ? portfolioCategoryHref(rootCategory.slug)
    : "/portfolio";

  return (
    <ContentPageShell flushTop>
      <article className="pb-20 lg:pb-28">
        <div className="page-title-band mb-8 md:mb-10">
          <div className="relative mx-auto max-w-7xl px-5 pb-4 pt-[calc(var(--header-height)+0.75rem)] lg:px-8 lg:pb-5 lg:pt-[calc(var(--header-height)+1rem)]">
            {titleEn ? (
              <p
                aria-hidden
                className="latin pointer-events-none absolute inset-x-5 top-[calc(var(--header-height)+2.4rem)] z-0 text-[clamp(1.75rem,5.5vw,3.75rem)] font-light uppercase leading-none tracking-[0.05em] text-ink/[0.07] lg:inset-x-8 lg:top-[calc(var(--header-height)+2.6rem)]"
              >
                {titleEn}
              </p>
            ) : null}

            <div className="reveal relative z-10 max-w-3xl">
              <nav
                aria-label="مسیر صفحه"
                className="mb-3 flex flex-wrap items-center gap-1.5 text-xs text-muted"
              >
                <Link
                  href="/portfolio"
                  className="link-hover transition hover:text-ink"
                >
                  نمونه‌کارها
                </Link>
                {rootCategory || categoryFa ? (
                  <>
                    <span aria-hidden className="text-line">
                      /
                    </span>
                    <Link
                      href={categoryHref}
                      className="link-hover transition hover:text-ink"
                    >
                      {rootCategory?.nameFa ?? categoryFa}
                    </Link>
                  </>
                ) : null}
                <span aria-hidden className="text-line">
                  /
                </span>
                <span className="line-clamp-1 text-ink-soft">{title}</span>
              </nav>

              <h1 className="whitespace-normal text-[clamp(1.35rem,3.8vw,2.5rem)] font-normal leading-tight tracking-tight text-ink">
                {title}
              </h1>

              {portfolio.abstract ? (
                <p className="mt-2 text-justify text-sm leading-7 text-muted md:text-base">
                  {portfolio.abstract}
                </p>
              ) : null}
            </div>
          </div>
        </div>

        <div className="mx-auto max-w-5xl px-5 lg:px-8">
          <PortfolioGallery
            cover={cover}
            images={gallery.map((item) => ({
              id: item.mediaId,
              url: item.url,
            }))}
            category={categoryFa}
            date={date}
            dateTime={portfolio.publishedAt}
          />

          {portfolio.mainTextHtml ? (
            <div className="reveal reveal-delay-2 mx-auto max-w-3xl">
              <HtmlContent html={portfolio.mainTextHtml} />
            </div>
          ) : null}
        </div>

        {portfolio.projectUrl ? (
          <PortfolioProjectLink
            url={portfolio.projectUrl}
            title={title}
          />
        ) : null}
      </article>
    </ContentPageShell>
  );
}