import type { PageServerLoad } from './$types';
import { getPageBySlug, getPages, getHomePageSlugFromConfig } from '$lib/cms';
import {
  extractCmsImageField,
  resolveContentImages,
  resolveImageUrls,
} from '$lib/rusty-image';
import { buildResponsiveImage, warmResponsiveImage, type ResponsiveImage } from '$lib/rusty-image.server';
import {
  resolvePostOverviewBlocks,
  resolveSearchableTextBlocks,
  resolveCalendarBlocks,
  resolveDeadlineBannerBlocks,
} from '$lib/blog-utils';
import { DEFAULT_HOME_PAGE_SLUG, PAGE_RESOLVE, SITE_NAME } from '$lib/constants';
import { sanitizeBlocks } from '$lib/sanitize-blocks.server';
import { logWarn } from '$lib/log.server';

const BANNER_WIDTHS = [640, 960, 1280, 1600, 1920];
const BANNER_AR = '16/9';

function focalToCss(focal: { x: number; y: number } | undefined): string | null {
  if (!focal) return null;
  return `${(focal.x * 100).toFixed(2)}% ${(focal.y * 100).toFixed(2)}%`;
}

export const load: PageServerLoad = async ({ locals, fetch }) => {
  const translations = locals.translations ?? {};
  let homeSlug = DEFAULT_HOME_PAGE_SLUG;
  try {
    homeSlug = (await getHomePageSlugFromConfig({ locale: 'de' })) ?? DEFAULT_HOME_PAGE_SLUG;
  } catch (err) {
    logWarn('home.slug', err);
  }

  let page = null;
  let pages: Awaited<ReturnType<typeof getPages>> = [];

  try {
    const [homePage, allPages] = await Promise.all([
      getPageBySlug(homeSlug, { locale: 'de', resolve: PAGE_RESOLVE }),
      getPages(),
    ]);
    page = homePage;
    pages = allPages ?? [];
    if (page) {
      await resolveContentImages(page);
      const tagsMap = await resolvePostOverviewBlocks(page);
      await resolveSearchableTextBlocks(page, tagsMap);
      await resolveCalendarBlocks(page);
      await resolveDeadlineBannerBlocks(page);
      sanitizeBlocks(page);
    }
  } catch (err) {
    logWarn('home.page', err, { homeSlug });
  }

  const siteName = (import.meta.env.PUBLIC_SITE_NAME as string | undefined) || SITE_NAME;

  let topBanner: {
    banner: import('$lib/cms').FullwidthBannerEntry | null;
    resolvedImages: string[];
    responsive: ResponsiveImage | null;
    focalCss: string | null;
    headline?: string;
    subheadline?: string;
  } | null = null;
  if (page) {
    const bannerRaw = (page as { topFullwidthBanner?: unknown }).topFullwidthBanner;
    if (bannerRaw && typeof bannerRaw === 'object' && 'image' in bannerRaw) {
      const bannerImages = Array.isArray((bannerRaw as { image?: unknown }).image)
        ? ((bannerRaw as { image?: unknown[] }).image ?? [])
        : (bannerRaw as { image?: unknown }).image != null
          ? [(bannerRaw as { image?: unknown }).image]
          : [];
      let resolvedImages: string[] = [];
      let responsive: ResponsiveImage | null = null;
      let focalCss: string | null = null;
      if (bannerImages.length > 0) {
        const primary = extractCmsImageField(bannerImages[0]);
        if (primary?.url) {
          focalCss = focalToCss(primary.focal);
          responsive = await buildResponsiveImage(primary.url, {
            widths: BANNER_WIDTHS,
            fit: 'cover',
            ar: BANNER_AR,
            quality: 72,
            focal: primary.focal,
          });
        }
        resolvedImages = await resolveImageUrls(bannerImages as string[], {
          width: 2000,
          height: 750,
          fit: 'cover',
          format: 'webp',
        });
      }
      warmResponsiveImage(responsive, fetch);
      topBanner = {
        banner: bannerRaw as import('$lib/cms').FullwidthBannerEntry | null,
        resolvedImages,
        responsive,
        focalCss,
        headline: page.headline ?? undefined,
        subheadline: page.subheadline ?? undefined,
      };
    }
  }

  return {
    page,
    pages,
    translations,
    topBanner,
    seoTitle: page
      ? (page.seoTitle ?? page.headline ?? page.linkName ?? siteName)
      : siteName,
    seoDescription: page ? (page.seoDescription ?? page.subheadline ?? '') : '',
    robots: (page as { seoMetaRobots?: string } | null)?.seoMetaRobots ?? undefined,
    keywords: (page as { seoKeywords?: string } | null)?.seoKeywords ?? undefined,
  };
};