/**
 * Typed, validated access to src/data/*.json.
 * A schema mismatch throws at import time, so `astro build` fails loudly.
 */
import { z } from 'astro/zod';
import siteJson from '../data/site.json';
import socialJson from '../data/social.json';
import homeJson from '../data/home.json';
import categoriesJson from '../data/categories.json';
import blogJson from '../data/blog.json';
import aboutJson from '../data/about.json';
import contactJson from '../data/contact.json';
import pagesJson from '../data/pages.json';

const link = z.object({ label: z.string().min(1), href: z.string().min(1) });
const icon = z.string().startsWith('tabler:');

const siteSchema = z.object({
  name: z.string(),
  title: z.string(),
  description: z.string().max(160),
  url: z.url(),
  lang: z.string(),
  locale: z.string(),
  titleSeparator: z.string(),
  author: z.object({ name: z.string(), callsign: z.string(), locator: z.string() }),
  postsPerPage: z.number().int().positive(),
  nav: z.array(link).min(1),
  footer: z.object({
    about: z.string(),
    quickLinksTitle: z.string(),
    legalTitle: z.string(),
    socialTitle: z.string(),
    rss: link,
    legal: z.array(link),
    license: z.string(),
    signoff: z.string(),
  }),
  ui: z.object({
    skipToContent: z.string(),
    mainNav: z.string(),
    footerNav: z.string(),
    menuOpen: z.string(),
    menuClose: z.string(),
    themeToggle: z.string(),
    newTab: z.string(),
    home: z.string(),
  }),
});

const socialSchema = z.array(
  z.object({
    id: z.string(),
    label: z.string(),
    // Empty string = account not set → hidden in the UI.
    href: z.union([z.url(), z.literal('')]),
    icon,
    handle: z.string().optional(),
  }),
);

const homeSchema = z.object({
  seo: z.object({ description: z.string().max(160) }),
  hero: z.object({
    numeral: z.string(),
    tags: z.array(z.object({ icon, label: z.string() })),
    asideTitle: z.string(),
    asideBody: z.string(),
    asideLink: link,
    eyebrow: z.string(),
    title: z.string(),
    lead: z.string(),
    ctas: z.array(
      link.extend({ variant: z.enum(['primary', 'secondary', 'link']), icon: icon.optional() }),
    ),
  }),
  sections: z.array(
    z.discriminatedUnion('type', [
      z.object({
        type: z.literal('feature'),
        id: z.string(),
        eyebrow: z.string(),
        title: z.string(),
        body: z.string(),
        callsign: z.string().optional(),
        callsignLabel: z.string().optional(),
        icon,
        link: link.extend({ href: z.url() }),
      }),
      z.object({
        type: z.literal('cards'),
        id: z.string(),
        eyebrow: z.string(),
        title: z.string(),
        items: z
          .array(
            z.object({
              title: z.string(),
              description: z.string().optional(),
              href: z.url(),
              icon,
            }),
          )
          .min(1),
      }),
      z.object({
        type: z.literal('latestPosts'),
        id: z.string(),
        eyebrow: z.string(),
        title: z.string(),
        count: z.number().int().positive(),
        allLink: link,
        empty: z.string(),
      }),
    ]),
  ),
});

const categoriesSchema = z
  .array(
    z.object({
      slug: z.string().regex(/^[a-z0-9-]+$/),
      name: z.string(),
      description: z.string(),
      icon,
    }),
  )
  .min(1);

/** Object of required string keys; keeps the key names in the inferred type. */
const strings = <const K extends string>(keys: readonly K[]) =>
  z.object(Object.fromEntries(keys.map((k) => [k, z.string()])) as Record<K, z.ZodString>);

const blogSchema = z.object({
  seo: z.object({ title: z.string(), description: z.string().max(160) }),
  list: strings([
    'eyebrow',
    'title',
    'categoryEyebrow',
    'tagEyebrow',
    'tagTitle',
    'categoryDescription',
    'tagDescription',
    'pageTitle',
    'empty',
  ]),
  card: strings(['readMore', 'readingTime']),
  dates: strings(['created', 'updated']),
  pager: strings(['label', 'first', 'prev', 'next', 'last', 'page']),
  sidebar: strings([
    'label',
    'search',
    'searchLabel',
    'searchPlaceholder',
    'searchNoResults',
    'searchResults',
    'searchUnavailable',
    'categories',
    'featured',
    'tags',
  ]),
  post: strings([
    'breadcrumbLabel',
    'toc',
    'shareLabel',
    'copyLink',
    'copied',
    'nativeShare',
    'copyCode',
    'codeCopied',
    'category',
    'tags',
    'adjacentLabel',
    'prev',
    'next',
    'license',
    'licenseName',
    'licenseHref',
  ]),
  diy: z.object({ title: z.string(), body: z.string(), link }),
  share: z.array(
    z.object({ id: z.string(), label: z.string(), icon, url: z.string().includes('{url}') }),
  ),
});

const seo = z.object({ title: z.string().max(60), description: z.string().max(160) });

const aboutSchema = z.object({
  seo,
  eyebrow: z.string(),
  title: z.string(),
  lead: z.string(),
  identity: z.object({
    title: z.string(),
    items: z.array(z.object({ label: z.string(), value: z.string(), icon })),
  }),
  equipment: z.array(
    z.object({
      title: z.string(),
      icon,
      items: z.array(z.object({ name: z.string(), note: z.string().optional() })).min(1),
    }),
  ),
});

const contactSchema = z.object({
  seo,
  eyebrow: z.string(),
  title: z.string(),
  icon,
  lead: z.string(),
  infoTitle: z.string(),
  map: z.object({
    title: z.string(),
    lat: z.number().min(-90).max(90),
    lng: z.number().min(-180).max(180),
    zoom: z.number().int().min(1).max(19),
    popup: z.string(),
    ariaLabel: z.string(),
    note: z.string(),
    loading: z.string(),
  }),
  items: z.array(
    z.object({
      label: z.string(),
      icon,
      values: z.array(z.string()).optional(),
      href: z.url().optional(),
      email: z.email().optional(),
    }),
  ),
});

const pagesSchema = z.object({
  legal: strings(['eyebrow', 'updated', 'notice']),
  notFound: z.object({
    seoTitle: z.string(),
    description: z.string(),
    eyebrow: z.string(),
    title: z.string(),
    lead: z.string(),
    links: z.array(link.extend({ variant: z.enum(['primary', 'secondary', 'link']), icon })),
  }),
});

function parse<T>(name: string, schema: z.ZodType<T>, data: unknown): T {
  const result = schema.safeParse(data);
  if (!result.success) {
    throw new Error(`src/data/${name} is invalid:\n${z.prettifyError(result.error)}`);
  }
  return result.data;
}

export const site = parse('site.json', siteSchema, siteJson);
export const home = parse('home.json', homeSchema, homeJson);
export const categories = parse('categories.json', categoriesSchema, categoriesJson);
export const blog = parse('blog.json', blogSchema, blogJson);
export const about = parse('about.json', aboutSchema, aboutJson);
export const contact = parse('contact.json', contactSchema, contactJson);
export const pages = parse('pages.json', pagesSchema, pagesJson);
export const social = parse('social.json', socialSchema, socialJson).filter((s) => s.href);

export type Site = z.infer<typeof siteSchema>;
export type HomeSection = (typeof home.sections)[number];
export type Category = (typeof categories)[number];
export type SocialLink = (typeof social)[number];

/** Fills `{key}` placeholders in UI strings from the JSON files. */
export function fmt(template: string, values: Record<string, string | number>): string {
  return template.replace(/\{(\w+)\}/g, (m, k: string) => (k in values ? String(values[k]) : m));
}