/* ============================================================================
   HOME  -  /en  and  /ar
   ----------------------------------------------------------------------------
   Figma frame 253:4799 ("Home-en"). The frame is four bands:

     Hero header (253:4800)      the SHARP-ER lockup, the headline, the CTA
                                 pair and the wide washed picture. The frame's
                                 subheading node is hidden, so the hero carries
                                 no lead unless the CMS supplies one.
     About the Programme         253:4835, hidden="true" in the frame. It is
                                 the only place figures appear, so the band
                                 renders ONLY once the CMS has real numbers -
                                 there is no placeholder standing in for it.
     Offical launch (361:10853)  "The Journey of SHARP-ER Launch": one centred
                                 lead with four bold runs, a three-up photo
                                 strip that bleeds past the page and is
                                 clipped, and three plain centred captions.
     Partners (393:14754)        "Meet Our Partners", start-aligned, over a
                                 grid of logo-and-name tiles.
     Footer                      owned by the app shell, not by this module

   There is no Arabic frame in the file - only the navigation and the footer
   are drawn in Arabic - so /ar is this same DOM under `dir="rtl"`, which is
   why every inline edge below is logical (ps-/pe-/start-/end-) and never
   left/right.

   Copy is the approved draft in both languages; the pictures, the figures and
   the partner list come from Strapi and degrade to a localised empty state
   while it is empty.
   ========================================================================= */

import { Link } from "react-router";

import { ArrowIcon, Button } from "~/components/ui/Button";
import { createTranslator, getMessages, sectionPath } from "~/i18n";
import {
  buildMeta,
  buildOrganizationJsonLd,
  buildWebSiteJsonLd,
} from "~/lib/seo";
import { safeHref } from "~/lib/safe-href";

import type { Route } from "./+types/home";
import {
  isImageGalleryBlock,
  type CmsHomePage,
  type CmsPartner,
} from "./_page-kit/cms-types";
import {
  list,
  loadMany,
  loadSingle,
  toImage,
  toPartner,
  type ResolvedImage,
} from "./_page-kit/cms.server";
import { pageCopy } from "./_page-kit/copy";
import { routeLocale } from "./_page-kit/locale";
import {
  Container,
  EmptyState,
  PageHero,
  PageSection,
  SectionHeader,
  StatStrip,
} from "./_page-kit/sections";

/** Partner logos and CSO tiles - a wide but finite grid. */
const PARTNER_PAGE_SIZE = 36;

/**
 * The mark the hero draws above the headline (figma 253:4800). The frame paints
 * "SHARP" only - 272.58 x 57.65 of ink - not the full SHARP-ER lockup the
 * navigation carries, so this is the SHARP wordmark on its own, as vector so it
 * stays crisp at any size. `alt` is empty because the navigation's brand link
 * already carries the project's accessible name.
 */
const HERO_WORDMARK = {
  src: "/assets/sharp-wordmark-inverse.svg",
  alt: "",
  width: 272,
  height: 57,
  drawnWidth: 273,
} as const;

export async function loader({ params }: Route.LoaderArgs) {
  const locale = routeLocale(params);

  const page = await loadSingle<CmsHomePage>("home-page", {
    locale,
    populate: {
      hero: { populate: { media: true, ctas: true } },
      stats: true,
      // Strapi 5 populates a dynamic zone per component with `on`.
      blocks: { on: { "blocks.image-gallery": { populate: { images: true } } } },
      partners: { populate: { logo: true, logoDark: true } },
      seo: { populate: { ogImage: true } },
    },
  });

  /* The curated relation wins; otherwise show every partner the CMS knows, so
     the grid fills in as soon as partners exist - before anyone remembers to
     curate the home page itself. */
  const curated = list(page?.partners);
  const partners =
    curated.length > 0
      ? curated
      : await loadMany<CmsPartner>("partners", {
          locale,
          sort: ["name:asc"],
          filters: { partnerRole: { $in: ["cso-partner", "institution"] } },
          populate: { logo: true, logoDark: true },
          pagination: { pageSize: PARTNER_PAGE_SIZE },
        });

  const gallery = list(page?.blocks)
    .filter(isImageGalleryBlock)
    .flatMap((block) => list(block.images))
    .map((image) => toImage(image, "medium"))
    .filter((image): image is ResolvedImage => image !== undefined);

  return {
    locale,
    hero: {
      eyebrow: page?.hero?.eyebrow ?? null,
      headline: page?.hero?.headline ?? null,
      subheading: page?.hero?.subheading ?? null,
      media: toImage(page?.hero?.media, "large") ?? null,
      ctas: list(page?.hero?.ctas).map((cta) => ({
        label: cta.label,
        href: cta.href,
        variant: cta.variant ?? "primary",
      })),
    },
    stats: list(page?.stats).map((stat) => ({
      value: stat.value,
      label: stat.label,
    })),
    gallery,
    partnersHeadline: page?.partnersHeadline ?? null,
    partners: partners.map(toPartner),
    seo: {
      title: page?.seo?.metaTitle ?? null,
      description: page?.seo?.metaDescription ?? null,
      image: toImage(page?.seo?.ogImage, "large") ?? null,
      noIndex: page?.seo?.noIndex ?? false,
    },
  };
}

export function meta({ loaderData, matches }: Route.MetaArgs) {
  const root = matches[0].loaderData;
  const locale = loaderData?.locale ?? root.locale;
  const messages = getMessages(locale);

  return buildMeta({
    locale,
    pathname: root.pathname,
    siteUrl: root.siteUrl,
    title: loaderData?.seo.title ?? messages.site.metaTitle,
    description: loaderData?.seo.description ?? messages.site.description,
    ...(loaderData?.seo.image
      ? { image: { url: loaderData.seo.image.src, alt: loaderData.seo.image.alt } }
      : {}),
    noIndex: loaderData?.seo.noIndex ?? false,
    // Emitted once for the whole site, from its home page.
    jsonLd: [
      buildOrganizationJsonLd({ siteUrl: root.siteUrl, locale }),
      buildWebSiteJsonLd({ siteUrl: root.siteUrl, locale }),
    ],
  });
}

interface HeroCtaProps {
  href: string;
  label: string;
  variant: "primary" | "secondary";
}

/**
 * A hero call to action. Figma paints the secondary one as a white fill with a
 * black stroke and a dark label, which is the secondary variant on the LIGHT
 * surface - so the surface is flipped on the control itself. It has to be the
 * control and not a wrapper: `[data-surface]` paints a background in the base
 * layer, and a wrapping element would draw a square white box behind the
 * button's rounded corners.
 */
function HeroCta({ href, label, variant }: HeroCtaProps) {
  return (
    <Button
      as={Link}
      to={href}
      prefetch="intent"
      size="lg"
      variant={variant}
      {...(variant === "secondary" ? { "data-surface": "light" } : {})}
      iconEnd={variant === "primary" ? <ArrowIcon /> : undefined}
    >
      {label}
    </Button>
  );
}

/**
 * The three-up strip under the launch lead (figma 361:11115). The row is drawn
 * 1849px wide against a 1440px page, so it deliberately overflows the page and
 * is clipped by the band - the widths below are the designed proportions of the
 * 1440 artboard (500 / 729 / 500) carried over as viewport fractions, which
 * reproduces the overhang at any width. The centre picture is the emphasised
 * one; the flanks sit at half strength and are dropped on small screens, where
 * three clipped pictures would be unreadable.
 */
function LaunchStrip({ images }: { images: readonly ResolvedImage[] }) {
  const first = images[0];
  if (!first) return null;

  /* The flanks only exist as a trio. With one or two pictures the emphasised
     one stays centred and the row simply has no wings, rather than throwing
     the centre off-axis or hiding an uploaded picture below `lg`. */
  const complete = images.length >= 3;
  const centre = complete ? images[1]! : first;
  const flanks = complete
    ? { start: images[0]!, end: images[2]! }
    : { start: undefined, end: undefined };

  return (
    <ul className="flex list-none items-center justify-center gap-3xl">
      {flanks.start ? (
        <li className="hidden shrink-0 lg:block">
          <img
            src={flanks.start.src}
            alt={flanks.start.alt}
            loading="lazy"
            className="aspect-[500/268] w-[34.7vw] object-cover opacity-50"
          />
        </li>
      ) : null}

      <li className="shrink-0">
        <img
          src={centre.src}
          alt={centre.alt}
          loading="lazy"
          className="aspect-[729/374] w-[86vw] object-cover lg:w-[50.6vw]"
        />
      </li>

      {flanks.end ? (
        <li className="hidden shrink-0 lg:block">
          <img
            src={flanks.end.src}
            alt={flanks.end.alt}
            loading="lazy"
            className="aspect-[500/267] w-[34.7vw] object-cover opacity-50"
          />
        </li>
      ) : null}
    </ul>
  );
}

export default function Home({ loaderData }: Route.ComponentProps) {
  const { locale, hero, stats, gallery, partners } = loaderData;
  const t = createTranslator(locale);
  const copy = pageCopy(locale).home;

  const headline = hero.headline ?? copy.heroHeadline;
  const partnersHeadline = loaderData.partnersHeadline ?? copy.partnersHeading;

  /* The frame draws one accent CTA and one white one. Editor-supplied CTAs go
     through the same component as the fallback pair, so a `secondary` CTA
     authored in Strapi gets the white treatment too. */
  const heroCtas: readonly HeroCtaProps[] =
    hero.ctas.length > 0
      ? hero.ctas.map((cta) => ({
          href: cta.href,
          label: cta.label,
          variant: cta.variant === "primary" ? "primary" : "secondary",
        }))
      : [
          {
            href: sectionPath("about", locale),
            label: t("actions.discoverSharper"),
            variant: "primary",
          },
          {
            href: sectionPath("whatWeDo", locale),
            label: t("actions.exploreOurWork"),
            variant: "secondary",
          },
        ];

  return (
    <>
      {/* `lead` is passed only when the CMS supplies a subheading: the frame's
          own subheading node is hidden, so nothing stands under the headline
          unless an editor deliberately writes one. */}
      <PageHero
        title={headline}
        {...(hero.eyebrow ? { eyebrow: hero.eyebrow } : {})}
        {...(hero.subheading ? { lead: hero.subheading } : {})}
        wordmark={HERO_WORDMARK}
        {...(hero.media ? { media: hero.media } : {})}
        mediaTreatment="banner"
        actions={
          heroCtas.map((cta) => (
            <HeroCta key={`${cta.href}-${cta.label}`} {...cta} />
          ))
        }
      />

      {/* FIGURES - 253:4835 is hidden in the frame and every figure in the
          draft is marked TBD, so the band exists only once the CMS has real
          numbers. Nothing is rendered in its place. */}
      {stats.length > 0 ? (
        <PageSection aria-labelledby="home-stats-heading">
          <div className="flex flex-col gap-3xl">
            <SectionHeader
              id="home-stats-heading"
              title={copy.statsHeading}
              size="display"
            />
            <StatStrip stats={stats} />
          </div>
        </PageSection>
      ) : null}

      {/* THE LAUNCH STORY - the band is `bleed` so the photo strip can run past
          the content column, and it clips what runs past the page. */}
      <PageSection
        aria-labelledby="home-launch-heading"
        bleed
        className="overflow-hidden"
      >
        <div className="flex flex-col gap-3xl">
          <Container>
            <div className="flex flex-col items-center gap-lg text-center">
              <SectionHeader
                id="home-launch-heading"
                title={copy.launchHeading}
                size="display"
                align="center"
              />

              {/* One paragraph with four bold runs, as the frame sets it. The
                  designed 20px has no published type role, so it takes the
                  nearest one, Body/Large - whose 28px leading is the frame's. */}
              <p className="body-lg text-[var(--text-primary)]">
                {copy.launchLead.map((run, index) =>
                  typeof run === "string" ? (
                    <span key={index}>{run}</span>
                  ) : (
                    <strong key={index} className="body-lg-bold">
                      {run.em}
                    </strong>
                  ),
                )}
              </p>
            </div>
          </Container>

          {gallery.length > 0 ? <LaunchStrip images={gallery} /> : null}

          <Container>
            {/* Figma prints these three captions with no heading of their own;
                the heading exists for the outline and for screen readers. */}
            <h3 id="home-mechanisms-heading" className="sr-only">
              {copy.mechanismsHeading}
            </h3>

            <ul
              aria-labelledby="home-mechanisms-heading"
              className="grid list-none grid-cols-1 gap-lg text-center sm:grid-cols-2 lg:grid-cols-3"
            >
              {copy.mechanisms.map((mechanism) => (
                <li
                  key={mechanism}
                  className="mx-auto max-w-[21.875rem] heading-h2 text-[var(--text-primary)]"
                >
                  {mechanism}
                </li>
              ))}
            </ul>
          </Container>
        </div>
      </PageSection>

      {/* PARTNERS */}
      <PageSection aria-labelledby="home-partners-heading">
        <div className="flex flex-col gap-3xl">
          <SectionHeader
            id="home-partners-heading"
            title={partnersHeadline}
            size="display"
          />

          {partners.length > 0 ? (
            <ul className="grid list-none grid-cols-1 gap-lg sm:grid-cols-2 lg:grid-cols-3 lg:gap-x-4xl">
              {partners.map((partner) => (
                /* The tile pads its inline start only, as the frame draws it,
                   and sits on the sunken surface - darker than the page, which
                   is the way round the design has it. */
                <li
                  key={partner.id}
                  className="flex min-h-[7.125rem] items-center gap-md rounded-control bg-[var(--surface-sunken)] ps-md py-sm"
                >
                  {partner.logo ? (
                    <img
                      src={partner.logo.src}
                      alt=""
                      loading="lazy"
                      className="size-[4.375rem] shrink-0 object-contain"
                    />
                  ) : null}

                  {/* An editor-supplied URL: `safeHref` refuses anything
                      that is not http/https/mailto/tel, and the plain-text
                      branch below already renders the partner's name. */}
                  {safeHref(partner.website) ? (
                    <a
                      href={safeHref(partner.website)}
                      target="_blank"
                      rel="noopener noreferrer"
                      className="body-lg-bold text-[var(--text-link)] underline underline-offset-2 hover:text-[var(--text-link-hover)]"
                    >
                      {partner.name}
                    </a>
                  ) : (
                    <span className="body-lg-bold text-[var(--text-primary)]">
                      {partner.name}
                    </span>
                  )}
                </li>
              ))}
            </ul>
          ) : (
            <EmptyState message={copy.partnersEmpty} />
          )}
        </div>
      </PageSection>
    </>
  );
}