Autorenbox

'use client';

import { useId, useState } from 'react';
import { cn, useLocale, useTexts } from '@/lib/kit';
import { Icon, type IconName } from '@/components/ui/icon';
import { Eyebrow, Section } from '@/components/ui/section';
import { Reveal } from '@/components/ui/reveal';
import { Stagger } from '@/components/ui/motion';

/*
 * Who wrote this and why they know: the box about the author of an article.
 *
 *   end-card  after the text, with portrait, bio, links and the way to
 *             every article of the author
 *   follow    a slim strip with a follow button and a bio that opens
 *   sidebar   a sticky card beside the text with credentials and a contact
 *   team      several people and what each did, text, research, pictures
 */

export type AuthorBoxVariant = 'end-card' | 'follow' | 'sidebar' | 'team';

export interface AuthorLink {
  label: string;
  href: string;
  icon?: IconName;
}

export interface AuthorBoxAuthor {
  name: string;
  role?: string;
  bio?: string;
  avatar?: React.ReactNode;
  links?: AuthorLink[];
  /** As shown, e.g. 24 */
  articles?: number;
  /** Link to every article of the author */
  href?: string;
  /** sidebar: what makes the author an expert */
  credentials?: string[];
  /** team: what this person did, e.g. "Text" or "Photos" */
  contribution?: string;
}

const TEXTS = {
  en: {
    about: 'About the author',
    aboutTeam: 'Made by',
    articles: '{n} articles',
    allArticles: 'All {n} articles',
    follow: 'Follow',
    following: 'Following',
    followers: '{n} readers follow',
    more: 'More about {name}',
    less: 'Less',
    contact: 'Ask a question',
    by: 'By',
    and: 'and',
  },
  de: {
    about: 'Zur Person',
    aboutTeam: 'Entstanden mit',
    articles: '{n} Artikel',
    allArticles: 'Alle {n} Artikel',
    follow: 'Folgen',
    following: 'Du folgst',
    followers: '{n} Lesende folgen',
    more: 'Mehr über {name}',
    less: 'Weniger',
    contact: 'Frage stellen',
    by: 'Von',
    and: 'und',
  },
};
type Texts = (typeof TEXTS)['en'];

export interface AuthorBoxProps {
  variant?: AuthorBoxVariant;
  /** One author, or several for team */
  authors: AuthorBoxAuthor[];
  eyebrow?: React.ReactNode;
  title?: React.ReactNode;
  /** follow: how many follow already */
  followers?: number;
  /** sidebar: the article text beside the card */
  body?: string[];
  /** sidebar: target of the contact button */
  contactHref?: string;
  labels?: Partial<Texts>;
  className?: string;
}

const focus = 'outline-none focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-solid focus-visible:outline-ring';
const fill = (s: string, v: Record<string, string | number>) => Object.entries(v).reduce((a, [k, x]) => a.replace(`{${k}}`, String(x)), s);

function Avatar({ node, className }: { node?: React.ReactNode; className?: string }) {
  return <span data-clip-ok className={cn('relative block shrink-0 overflow-hidden rounded-full bg-muted ring-1 ring-border [&>*]:size-full', className)}>{node}</span>;
}

function Links({ links, className }: { links?: AuthorLink[]; className?: string }) {
  if (!links?.length) return null;
  return (
    <ul className={cn('flex flex-wrap gap-2', className)}>
      {links.map((l) => (
        <li key={l.href}>
          <a href={l.href} className={cn('inline-flex min-h-11 items-center gap-2 rounded-lg border border-border bg-background px-3.5 text-[13px] font-medium text-foreground transition-colors hover:bg-accent sm:min-h-9', focus)}>
            {l.icon && <Icon name={l.icon} size={15} className="text-muted-foreground" />}
            {l.label}
          </a>
        </li>
      ))}
    </ul>
  );
}

/* ------------------------------------------------------------------ */

function EndCard({ p, t }: { p: AuthorBoxProps; t: Texts }) {
  const a = p.authors[0];
  if (!a) return null;
  return (
    <Reveal className="mx-auto max-w-[44rem]">
      <aside aria-label={t.about} className="relative overflow-hidden rounded-2xl border border-border bg-card p-6 shadow-[var(--highlight),var(--shadow-sm)] sm:p-8">
        <div aria-hidden data-clip-ok className="pointer-events-none absolute -left-20 -top-24 size-64 rounded-full bg-[radial-gradient(closest-side,var(--glow),transparent)]" />
        <div className="relative grid grid-cols-[minmax(0,1fr)] gap-6 sm:grid-cols-[auto_minmax(0,1fr)] sm:gap-7">
          <div className="flex items-center gap-4 sm:block">
            <Avatar node={a.avatar} className="size-16 sm:size-20" />
            <div className="sm:hidden">
              <p className="text-[12px] font-medium text-subtle-foreground">{p.eyebrow ?? t.about}</p>
              <p className="text-[17px] font-semibold text-foreground">{a.name}</p>
              {a.role && <p className="text-[13.5px] text-muted-foreground">{a.role}</p>}
            </div>
          </div>
          <div>
            <div className="hidden sm:block">
              <p className="text-[12px] font-medium text-subtle-foreground">{p.eyebrow ?? t.about}</p>
              <p className="mt-1 text-[19px] font-semibold tracking-[-0.015em] text-foreground">{a.name}</p>
            </div>
            {a.role && <p className="mt-0.5 hidden text-[14px] text-muted-foreground sm:block">{a.role}</p>}
            {a.bio && <p className="mt-4 max-w-[36rem] text-pretty text-[15.5px] leading-relaxed text-[color-mix(in_oklab,var(--foreground)_80%,var(--background))]">{a.bio}</p>}
            <div className="mt-6 flex flex-col gap-4 border-t border-border pt-5 sm:flex-row sm:items-center sm:justify-between">
              <Links links={a.links} />
              {a.href && (
                <a href={a.href} className={cn('group inline-flex min-h-11 shrink-0 items-center gap-1.5 rounded-md text-[14px] font-medium text-foreground', focus)}>
                  {a.articles ? fill(t.allArticles, { n: a.articles }) : a.name}
                  <Icon name="arrow-right" size={15} className="transition-transform duration-300 group-hover:translate-x-0.5" />
                </a>
              )}
            </div>
          </div>
        </div>
      </aside>
    </Reveal>
  );
}

function Follow({ p, t }: { p: AuthorBoxProps; t: Texts }) {
  const a = p.authors[0];
  const [on, setOn] = useState(false);
  const [open, setOpen] = useState(false);
  const id = useId();
  const locale = useLocale();
  if (!a) return null;
  const count = (p.followers ?? 0) + (on ? 1 : 0);
  return (
    <Reveal className="mx-auto max-w-[44rem]">
      <aside aria-label={t.about} className="rounded-2xl border border-border bg-surface shadow-[var(--highlight)]">
        <div className="flex flex-wrap items-center gap-4 p-4 sm:flex-nowrap sm:p-5">
          <Avatar node={a.avatar} className="size-12" />
          <div className="min-w-0 flex-1">
            <p className="truncate text-[15px] font-semibold text-foreground">{a.name}</p>
            <p className="truncate text-[13px] text-muted-foreground">
              {[a.role, a.articles ? fill(t.articles, { n: a.articles }) : null].filter(Boolean).join(' · ')}
            </p>
          </div>
          <div className="flex w-full items-center gap-2 sm:w-auto">
            {a.bio && (
              <button
                type="button"
                aria-expanded={open}
                aria-controls={id}
                onClick={() => setOpen((o) => !o)}
                className={cn('inline-flex min-h-11 flex-1 cursor-pointer items-center justify-center gap-1.5 whitespace-nowrap rounded-lg border border-border px-3.5 text-[13px] font-medium text-muted-foreground sm:border-transparent transition-colors hover:bg-accent hover:text-foreground sm:min-h-10 sm:flex-none', focus)}
              >
                {open ? t.less : fill(t.more, { name: a.name.split(' ')[0] })}
                <Icon name="chevron-down" size={15} className={cn('transition-transform duration-300', open && 'rotate-180')} />
              </button>
            )}
            <button
              type="button"
              aria-pressed={on}
              onClick={() => setOn((o) => !o)}
              className={cn(
                'inline-flex min-h-11 shrink-0 cursor-pointer items-center justify-center gap-1.5 whitespace-nowrap rounded-lg px-4 text-[13px] font-medium transition-[background-color,color,box-shadow,transform] duration-200 active:scale-[0.97] sm:min-h-10 sm:flex-none',
                on ? 'border border-border bg-background text-foreground' : 'bg-primary text-primary-foreground shadow-[inset_0_1px_0_rgb(255_255_255/0.18),var(--shadow-sm)] hover:bg-[color-mix(in_oklab,var(--primary)_88%,var(--background))]',
                focus,
              )}
            >
              <Icon name={on ? 'check' : 'plus'} size={15} className={cn(on && 'motion-safe:animate-[kit-rise_0.35s_var(--ease-kit)]')} />
              {on ? t.following : t.follow}
            </button>
          </div>
        </div>
        <div id={id} className={cn('grid transition-[grid-template-rows] duration-500 ease-[var(--ease-kit)] motion-reduce:transition-none', open ? 'grid-rows-[1fr]' : 'grid-rows-[0fr]')}>
          <div className={cn('min-h-0 overflow-hidden', !open && 'invisible')}>
            <div className="border-t border-border px-4 pb-5 pt-4 sm:px-5 sm:pl-[5.25rem]">
              <p className="max-w-[34rem] text-pretty text-[15px] leading-relaxed text-muted-foreground">{a.bio}</p>
              <Links links={a.links} className="mt-4" />
            </div>
          </div>
        </div>
        {p.followers !== undefined && (
          <p className="border-t border-border px-4 py-2.5 text-[12.5px] tabular-nums text-muted-foreground sm:px-5" aria-live="polite">
            {fill(t.followers, { n: new Intl.NumberFormat(locale === 'de' ? 'de-DE' : 'en-US').format(count) })}
          </p>
        )}
      </aside>
    </Reveal>
  );
}

function Sidebar({ p, t }: { p: AuthorBoxProps; t: Texts }) {
  const a = p.authors[0];
  if (!a) return null;
  return (
    <div className="grid grid-cols-[minmax(0,1fr)] gap-10 lg:grid-cols-[minmax(0,1fr)_20rem] lg:gap-16">
      <div className="min-w-0">
        {p.eyebrow && <Eyebrow>{p.eyebrow}</Eyebrow>}
        {p.title && <h2 className="max-w-[36rem] text-balance text-h2 font-semibold text-foreground">{p.title}</h2>}
        <div className="mt-8 max-w-[36rem] space-y-6 text-pretty text-[17px] leading-[1.75] text-[color-mix(in_oklab,var(--foreground)_86%,var(--background))]">
          {p.body?.map((b, i) => (
            <p key={i}>{b}</p>
          ))}
        </div>
      </div>
      <aside aria-label={t.about} className="row-start-1 lg:col-start-2 lg:row-start-1">
        <Reveal effect="rise" className="lg:sticky lg:top-24">
          <div className="overflow-hidden rounded-2xl border border-border bg-card shadow-[var(--highlight),var(--shadow-md)]">
            <div className="flex items-center gap-4 p-5 lg:block lg:p-0">
              <Avatar node={a.avatar} className="size-16 lg:aspect-[4/3] lg:size-auto lg:w-full lg:rounded-none lg:ring-0" />
              <div className="min-w-0 lg:border-t lg:border-border lg:px-5 lg:pt-5">
                <p className="text-[12px] font-medium text-subtle-foreground">{t.about}</p>
                <p className="mt-0.5 text-[17px] font-semibold text-foreground">{a.name}</p>
                {a.role && <p className="text-[13.5px] text-muted-foreground">{a.role}</p>}
              </div>
            </div>
            <div className="border-t border-border px-5 pb-5 pt-4 lg:border-t-0 lg:pt-3">
              {a.bio && <p className="text-pretty text-[14px] leading-relaxed text-muted-foreground">{a.bio}</p>}
              {a.credentials?.length ? (
                <Stagger as="ul" step={80} className="mt-4 space-y-2.5">
                  {a.credentials.map((c) => (
                    <li key={c} className="flex gap-2.5 text-[13.5px] leading-snug text-foreground">
                      <span className="mt-px flex size-[18px] shrink-0 items-center justify-center rounded-full bg-[color-mix(in_oklab,var(--primary)_14%,transparent)] text-[color-mix(in_oklab,var(--primary)_85%,var(--foreground))]">
                        <Icon name="check" size={11} strokeWidth={2.4} />
                      </span>
                      {c}
                    </li>
                  ))}
                </Stagger>
              ) : null}
              {p.contactHref && (
                <a href={p.contactHref} className={cn('mt-5 flex min-h-11 items-center justify-center gap-2 rounded-lg border border-border-strong bg-background text-[14px] font-medium text-foreground shadow-[var(--shadow-sm)] transition-colors hover:bg-accent', focus)}>
                  <Icon name="message-circle" size={16} />
                  {t.contact}
                </a>
              )}
            </div>
          </div>
        </Reveal>
      </aside>
    </div>
  );
}

function Team({ p, t }: { p: AuthorBoxProps; t: Texts }) {
  const names = p.authors.map((a) => a.name);
  const byline = names.length > 1 ? `${names.slice(0, -1).join(', ')} ${t.and} ${names[names.length - 1]}` : names[0];
  return (
    <div className="mx-auto max-w-[60rem]">
      <div className="flex flex-col gap-5 sm:flex-row sm:items-center sm:justify-between">
        <div>
          {p.eyebrow && <Eyebrow className="mb-2">{p.eyebrow}</Eyebrow>}
          <h2 className="text-balance text-[clamp(1.375rem,1.15rem+0.8vw,1.75rem)] font-semibold tracking-[-0.02em] text-foreground">{p.title ?? t.aboutTeam}</h2>
          <p className="mt-1.5 text-[14px] text-muted-foreground">
            {t.by} {byline}
          </p>
        </div>
        <div className="flex -space-x-3" aria-hidden>
          {p.authors.map((a) => (
            <Avatar key={a.name} node={a.avatar} className="size-12 ring-[3px] ring-background transition-transform duration-300 hover:z-10 hover:-translate-y-1" />
          ))}
        </div>
      </div>
      {/* hairlines from each cell (right and bottom), the outer ones are clipped, so a short last row leaves no grey gap */}
      <Stagger as="ul" step={90} className="mt-8 grid grid-cols-[minmax(0,1fr)] overflow-hidden rounded-2xl border border-border bg-card sm:grid-cols-2 lg:grid-cols-3">
        {p.authors.map((a) => (
          <li key={a.name} className="flex flex-col p-6 shadow-[1px_0_0_var(--border),0_1px_0_var(--border)]">
            <div className="flex items-center gap-3.5">
              <Avatar node={a.avatar} className="size-11" />
              <div className="min-w-0">
                <p className="truncate text-[15px] font-semibold text-foreground">{a.name}</p>
                {a.role && <p className="truncate text-[13px] text-muted-foreground">{a.role}</p>}
              </div>
            </div>
            {a.contribution && (
              <p className="mt-5 inline-flex w-fit items-center gap-1.5 rounded-md bg-[color-mix(in_oklab,var(--primary)_12%,transparent)] px-2 py-1 text-[12px] font-medium text-[color-mix(in_oklab,var(--primary)_80%,var(--foreground))]">{a.contribution}</p>
            )}
            {a.bio && <p className="mt-3 text-pretty text-[14px] leading-relaxed text-muted-foreground">{a.bio}</p>}
            {a.href && (
              <a href={a.href} className={cn('group mt-auto inline-flex min-h-11 items-center gap-1.5 self-start rounded-md pt-3 text-[13.5px] font-medium text-foreground', focus)}>
                {a.articles ? fill(t.articles, { n: a.articles }) : a.name}
                <Icon name="arrow-right" size={14} className="transition-transform duration-300 group-hover:translate-x-0.5" />
              </a>
            )}
          </li>
        ))}
      </Stagger>
    </div>
  );
}

/**
 * The author box of an article: a card at the end, a strip with a follow
 * button, a sticky card beside the text or the team behind a piece.
 *   <AuthorBox variant="end-card" authors={[{ name, role, bio, avatar, links, articles, href }]} />
 */
export function AuthorBox(props: AuthorBoxProps) {
  const { variant = 'end-card', className, labels } = props;
  const t = useTexts(TEXTS, labels);
  return (
    <Section spacing="sm" className={className}>
      {variant === 'follow' ? <Follow p={props} t={t} /> : variant === 'sidebar' ? <Sidebar p={props} t={t} /> : variant === 'team' ? <Team p={props} t={t} /> : <EndCard p={props} t={t} />}
    </Section>
  );
}