Link in bio

'use client';

import { useEffect, useRef, useState } from 'react';
import { cn, round, useInView, useLocale, useSpotlight, useTexts, type Locale } from '@/lib/kit';
import { Button } from '@/components/ui/button';
import { Icon, type IconName } from '@/components/ui/icon';
import { Parallax, Stagger, Magnetic } from '@/components/ui/motion';
import { Section } from '@/components/ui/section';

/*
 * One page that holds everything a person links to: the latest work, the
 * products, the next dates, a way to subscribe. Built for creators,
 * coaches, artists and anyone with one link in a profile.
 *
 *   stack  the classic column, a featured link with a picture, the rest as rows, share with a copied check
 *   tiles  a bento of tiles, video, newsletter with its own form, products and the next date
 *   tabs   links, shop and dates behind one switch with a gliding marker
 *   dates  the next date with a live countdown, the others as a list with a reminder each
 *   split  a large portrait that stays while the grouped links scroll beside it
 */

export type LinkInBioVariant = 'stack' | 'tiles' | 'tabs' | 'dates' | 'split';

export interface BioProfile {
  name: string;
  /** e.g. @mira.draws or a short role */
  handle?: string;
  bio?: string;
  location?: string;
  avatar?: React.ReactNode;
  /** A wide picture behind the head, used by split and tiles */
  cover?: React.ReactNode;
  /** A short status line with a live dot, e.g. "Booking for March" */
  status?: string;
}

export interface BioLink {
  id: string;
  label: string;
  description?: string;
  href: string;
  icon?: IconName;
  /** A short marker like "New" */
  badge?: string;
  /** A picture for the featured link (the first one in stack) */
  image?: React.ReactNode;
}

export interface BioSocial {
  label: string;
  icon: IconName;
  href: string;
}

export interface BioProduct {
  id: string;
  title: string;
  /** e.g. "Preset pack" or "Ebook, 64 pages" */
  kind?: string;
  price: number;
  /** A struck through price before */
  was?: number;
  href: string;
  image?: React.ReactNode;
}

export interface BioEvent {
  id: string;
  title: string;
  /** ISO date and time, e.g. 2026-11-14T19:00 (local time of the event) */
  start: string;
  place?: string;
  /** e.g. "Live session" or "Workshop" */
  kind?: string;
  href: string;
  /** Seats left, shown when low */
  seats?: number;
}

export interface BioGroup {
  title: string;
  links: BioLink[];
}

export interface LinkInBioProps {
  variant?: LinkInBioVariant;
  profile: BioProfile;
  links?: BioLink[];
  socials?: BioSocial[];
  products?: BioProduct[];
  events?: BioEvent[];
  /** split: links in groups */
  groups?: BioGroup[];
  /** tiles: the video tile */
  video?: { title: string; length?: string; href: string; media?: React.ReactNode };
  /** tiles: the newsletter tile */
  newsletter?: { title: string; text?: string; count?: string };
  /** The address of this page, copied by the share button */
  shareUrl?: string;
  currency?: string;
  onSubscribe?: (email: string) => void;
  labels?: Partial<Texts>;
  className?: string;
}

const TEXTS = {
  en: {
    share: 'Copy link to this page',
    copied: 'Link copied',
    links: 'Links',
    shop: 'Shop',
    dates: 'Dates',
    sections: 'Sections',
    next: 'Next date',
    in: 'Starts in',
    days: 'days',
    hours: 'hrs',
    minutes: 'min',
    seconds: 'sec',
    remind: 'Remind me',
    reminded: 'Reminder set',
    seats: '{n} seats left',
    join: 'Save my seat',
    get: 'Get it',
    watch: 'Watch now',
    email: 'Email address',
    emailPh: 'you@example.com',
    subscribe: 'Subscribe',
    subscribed: 'You are in. The next letter comes on Sunday.',
    invalid: 'Please enter an email address like name@example.com.',
    socials: 'Elsewhere',
    later: 'Later dates',
    live: 'Happening now',
  },
  de: {
    share: 'Link zu dieser Seite kopieren',
    copied: 'Link kopiert',
    links: 'Links',
    shop: 'Shop',
    dates: 'Termine',
    sections: 'Bereiche',
    next: 'Nächster Termin',
    in: 'Beginnt in',
    days: 'Tage',
    hours: 'Std.',
    minutes: 'Min.',
    seconds: 'Sek.',
    remind: 'Erinnere mich',
    reminded: 'Erinnerung gesetzt',
    seats: 'Noch {n} Plätze',
    join: 'Platz sichern',
    get: 'Holen',
    watch: 'Jetzt ansehen',
    email: 'E-Mail-Adresse',
    emailPh: 'du@beispiel.de',
    subscribe: 'Abonnieren',
    subscribed: 'Du bist dabei. Der nächste Brief kommt am Sonntag.',
    invalid: 'Bitte gib eine E-Mail-Adresse wie name@beispiel.de ein.',
    socials: 'Woanders',
    later: 'Weitere Termine',
    live: 'Läuft gerade',
  },
};
type Texts = typeof TEXTS.en;

/* ------------------------------------------------------------------ */
/* Helpers                                                             */
/* ------------------------------------------------------------------ */

const TAG: Record<Locale, string> = { en: 'en-US', de: 'de-DE' };
const fill = (s: string, v: Record<string, string | number>) => s.replace(/\{(\w+)\}/g, (_, k) => String(v[k] ?? ''));
const focusRing = 'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background';
const fit = '[&>*]:size-full [&_img]:object-cover';

function money(value: number, currency: string, locale: Locale) {
  const whole = Number.isInteger(value);
  return new Intl.NumberFormat(TAG[locale], { style: 'currency', currency, minimumFractionDigits: whole ? 0 : 2, maximumFractionDigits: whole ? 0 : 2 }).format(value);
}
/** Dates are read as given, without the time zone of the visitor, so server and browser agree */
function parts(iso: string) {
  const [d, t = '00:00'] = iso.split('T');
  const [y, m, day] = d.split('-').map(Number);
  const [h, min] = t.split(':').map(Number);
  return new Date(Date.UTC(y, m - 1, day, h, min));
}
const fmt = (iso: string, locale: Locale, o: Intl.DateTimeFormatOptions) => new Intl.DateTimeFormat(TAG[locale], { timeZone: 'UTC', ...o }).format(parts(iso));

const MOTION_CSS = `
@keyframes kitbio-in{from{opacity:0;transform:translateY(8px)}}
@keyframes kitbio-swap{from{opacity:0;filter:blur(4px);transform:translateY(6px)}}
@keyframes kitbio-pop{0%{transform:scale(.4);opacity:0}60%{transform:scale(1.15);opacity:1}100%{transform:scale(1)}}
@keyframes kitbio-ring{to{transform:rotate(360deg)}}
@keyframes kitbio-tick{from{transform:translateY(-30%);opacity:.35}}
@media (prefers-reduced-motion:reduce){[class*="kitbio-"],.kitbio-anim{animation:none!important}}`;

function BioMotion() {
  return (
    <style href="kitbio-motion" precedence="default">
      {MOTION_CSS}
    </style>
  );
}

/** Copies the page address and shows a check for a moment */
function ShareButton({ url, t, className }: { url?: string; t: Texts; className?: string }) {
  const [done, setDone] = useState(false);
  const timer = useRef(0);
  useEffect(() => () => window.clearTimeout(timer.current), []);
  const copy = async () => {
    const href = url ?? (typeof window !== 'undefined' ? window.location.href : '');
    try {
      await navigator.clipboard?.writeText(href);
    } catch {
      /* the check still confirms the press, the address is shown in the tooltip */
    }
    setDone(true);
    window.clearTimeout(timer.current);
    timer.current = window.setTimeout(() => setDone(false), 1800);
  };
  return (
    <button type="button" onClick={copy} aria-label={done ? t.copied : t.share} title={url} className={cn('relative inline-flex size-11 shrink-0 items-center justify-center rounded-full border border-border bg-card/80 text-foreground shadow-[var(--highlight),var(--shadow-sm)] backdrop-blur transition-[transform,background-color] duration-300 ease-[var(--ease-kit)] hover:bg-accent active:scale-95', focusRing, className)}>
      <span className={cn('absolute inset-0 flex items-center justify-center transition-[opacity,transform] duration-300', done ? 'scale-50 opacity-0' : 'opacity-100')}>
        <Icon name="share" size={18} />
      </span>
      <span className={cn('absolute inset-0 flex items-center justify-center text-success transition-[opacity,transform] duration-300', done ? 'opacity-100' : 'scale-50 opacity-0')}>
        <Icon name="check" size={18} />
      </span>
      <span className="sr-only" aria-live="polite">
        {done ? t.copied : ''}
      </span>
    </button>
  );
}

/** Portrait in a ring that turns slowly once, with an optional live status */
function Head({ profile, size = 'md', align = 'center' }: { profile: BioProfile; size?: 'md' | 'lg'; align?: 'center' | 'left' }) {
  const center = align === 'center';
  return (
    <div className={cn('flex flex-col', center ? 'items-center text-center' : 'items-start text-left')}>
      <div className="relative">
        <span aria-hidden className="kitbio-anim absolute -inset-[3px] rounded-full bg-[conic-gradient(from_0deg,var(--primary),color-mix(in_oklab,var(--primary)_20%,transparent),var(--primary))] opacity-80 [animation:kitbio-ring_14s_linear_infinite]" />
        <div data-clip-ok className={cn('relative overflow-hidden rounded-full bg-muted ring-[3px] ring-background', size === 'lg' ? 'size-24' : 'size-[84px]', fit)}>{profile.avatar}</div>
      </div>
      <h3 className={cn('mt-4 font-semibold tracking-[-0.02em] text-foreground', size === 'lg' ? 'text-[26px]' : 'text-[21px]')}>{profile.name}</h3>
      {profile.handle && <p className="mt-0.5 text-[14px] text-muted-foreground">{profile.handle}</p>}
      {profile.bio && <p className={cn('mt-3 max-w-[30rem] text-pretty text-[15px] leading-relaxed text-foreground/85', center && 'text-balance')}>{profile.bio}</p>}
      {(profile.status || profile.location) && (
        <div className={cn('mt-4 flex flex-wrap items-center gap-2', center && 'justify-center')}>
          {profile.status && (
            <span className="inline-flex min-h-8 items-center gap-2 rounded-full bg-[color-mix(in_oklab,var(--success)_14%,transparent)] px-3 text-[13px] font-medium text-success-foreground">
              <span className="relative flex size-2">
                <span aria-hidden className="absolute inset-0 animate-ping rounded-full bg-success opacity-60 motion-reduce:animate-none" />
                <span className="relative size-2 rounded-full bg-success" />
              </span>
              {profile.status}
            </span>
          )}
          {profile.location && (
            <span className="inline-flex min-h-8 items-center gap-1.5 rounded-full border border-border px-3 text-[13px] text-muted-foreground">
              <Icon name="map-pin" size={14} />
              {profile.location}
            </span>
          )}
        </div>
      )}
    </div>
  );
}

function Socials({ socials = [], t, align = 'center' }: { socials?: BioSocial[]; t: Texts; align?: 'center' | 'left' }) {
  if (!socials.length) return null;
  return (
    <ul aria-label={t.socials} className={cn('flex flex-wrap gap-2', align === 'center' && 'justify-center')}>
      {socials.map((s) => (
        <li key={s.label}>
          <a href={s.href} aria-label={s.label} title={s.label} className={cn('inline-flex size-11 items-center justify-center rounded-full border border-border text-muted-foreground transition-[color,background-color,transform] duration-300 ease-[var(--ease-kit)] hover:-translate-y-0.5 hover:bg-accent hover:text-foreground', focusRing)}>
            <Icon name={s.icon} size={18} />
          </a>
        </li>
      ))}
    </ul>
  );
}

/** One link as a full width row. Arrow slides, light follows the mouse. */
function LinkRow({ link, className }: { link: BioLink; className?: string }) {
  const spot = useSpotlight<HTMLAnchorElement>();
  return (
    <a href={link.href} onPointerMove={spot} className={cn('kit-spotlight group relative flex min-h-[60px] items-center gap-3.5 rounded-xl border border-border bg-card px-4 py-3 shadow-[var(--highlight),var(--shadow-sm)] transition-[transform,box-shadow,border-color] duration-300 ease-[var(--ease-kit)] hover:-translate-y-0.5 hover:border-border-strong hover:shadow-[var(--highlight),var(--shadow-md)]', focusRing, className)}>
      {link.icon && (
        <span className="flex size-9 shrink-0 items-center justify-center rounded-lg bg-muted text-foreground transition-colors group-hover:bg-[color-mix(in_oklab,var(--primary)_14%,var(--muted))] group-hover:text-primary">
          <Icon name={link.icon} size={18} />
        </span>
      )}
      <span className="min-w-0 flex-1">
        <span className="flex items-start gap-2">
          <span className="line-clamp-2 text-[15px] font-medium leading-snug text-foreground">{link.label}</span>
          {link.badge && <span className="mt-px shrink-0 rounded-full bg-primary px-2 py-0.5 text-[11px] font-semibold text-primary-foreground">{link.badge}</span>}
        </span>
        {link.description && <span className="mt-0.5 block truncate text-[13px] text-muted-foreground">{link.description}</span>}
      </span>
      <Icon name="arrow-up-right" size={17} className="text-muted-foreground transition-transform duration-300 ease-[var(--ease-kit)] group-hover:-translate-y-0.5 group-hover:translate-x-0.5 group-hover:text-foreground" />
    </a>
  );
}

/** The featured link, a picture that zooms a little on hover */
function FeaturedLink({ link }: { link: BioLink }) {
  return (
    <a href={link.href} className={cn('group block overflow-hidden rounded-xl border border-border bg-card shadow-[var(--highlight),var(--shadow-sm)] transition-[transform,box-shadow] duration-300 ease-[var(--ease-kit)] hover:-translate-y-0.5 hover:shadow-[var(--highlight),var(--shadow-md)]', focusRing)}>
      {link.image && (
        <div data-clip-ok className="relative aspect-[16/8] overflow-hidden bg-muted">
          <div className={cn('absolute inset-0 transition-transform duration-700 ease-[var(--ease-kit)] group-hover:scale-[1.04] motion-reduce:transition-none', fit)}>{link.image}</div>
          {link.badge && <span className="absolute left-3 top-3 rounded-full bg-background/85 px-2.5 py-1 text-[12px] font-semibold text-foreground backdrop-blur">{link.badge}</span>}
        </div>
      )}
      <div className="flex items-center gap-3 px-4 py-3.5">
        <span className="min-w-0 flex-1">
          <span className="block text-[15.5px] font-semibold text-foreground">{link.label}</span>
          {link.description && <span className="mt-0.5 block text-[13px] text-muted-foreground">{link.description}</span>}
        </span>
        <span className="flex size-9 items-center justify-center rounded-full bg-primary text-primary-foreground transition-transform duration-300 ease-[var(--ease-kit)] group-hover:translate-x-0.5">
          <Icon name="arrow-right" size={16} />
        </span>
      </div>
    </a>
  );
}

/** Live countdown, computed only in the browser. The server shows the date. */
function useCountdown(iso?: string) {
  const [left, setLeft] = useState<number | null>(null);
  useEffect(() => {
    if (!iso) return;
    // The event time is read as local time of the visitor
    const [d, tm = '00:00'] = iso.split('T');
    const [y, m, day] = d.split('-').map(Number);
    const [h, min] = tm.split(':').map(Number);
    const target = new Date(y, m - 1, day, h, min).getTime();
    const tick = () => setLeft(Math.max(0, target - Date.now()));
    tick();
    const id = window.setInterval(tick, 1000);
    return () => window.clearInterval(id);
  }, [iso]);
  return left;
}

function Countdown({ iso, t }: { iso: string; t: Texts }) {
  const left = useCountdown(iso);
  const locale = useLocale();
  const units = left === null ? null : [Math.floor(left / 864e5), Math.floor(left / 36e5) % 24, Math.floor(left / 6e4) % 60, Math.floor(left / 1e3) % 60];
  const names = [t.days, t.hours, t.minutes, t.seconds];
  if (left === 0)
    return (
      <p role="status" className="flex min-h-[76px] items-center justify-center gap-2 rounded-xl border border-border bg-card text-[15px] font-semibold text-foreground">
        <span className="size-2 rounded-full bg-destructive" />
        {t.live}
      </p>
    );
  return (
    <div className="grid grid-cols-4 gap-px overflow-hidden rounded-xl border border-border bg-border" role="timer" aria-label={`${t.in} ${fmt(iso, locale, { dateStyle: 'long' })}`}>
      {names.map((n, i) => (
        <div key={n} className="bg-card px-2 py-3 text-center">
          <span className="block overflow-hidden text-[26px] font-semibold leading-none tracking-[-0.02em] tabular-nums text-foreground sm:text-[30px]">
            {units ? (
              <span key={units[i]} className={cn('inline-block', i === 3 && '[animation:kitbio-tick_.35s_var(--ease-kit)]')}>
                {String(units[i]).padStart(2, '0')}
              </span>
            ) : (
              <span className="text-muted-foreground">··</span>
            )}
          </span>
          <span className="mt-1.5 block text-[12px] text-muted-foreground">{n}</span>
        </div>
      ))}
    </div>
  );
}

function DateBadge({ iso, className }: { iso: string; className?: string }) {
  const locale = useLocale();
  return (
    <span className={cn('flex w-14 shrink-0 flex-col items-center justify-center rounded-lg border border-border bg-surface py-1.5 leading-none', className)}>
      <span className="text-[11px] font-semibold uppercase tracking-[0.06em] text-primary">{fmt(iso, locale, { month: 'short' }).replace('.', '')}</span>
      <span className="mt-1 text-[20px] font-semibold tabular-nums text-foreground">{fmt(iso, locale, { day: 'numeric' }).replace('.', '')}</span>
    </span>
  );
}

function RemindButton({ t, title }: { t: Texts; title: string }) {
  const [on, setOn] = useState(false);
  return (
    <button type="button" aria-pressed={on} aria-label={`${on ? t.reminded : t.remind}, ${title}`} onClick={() => setOn((v) => !v)} className={cn('inline-flex min-h-11 min-w-11 shrink-0 items-center justify-center gap-1.5 rounded-lg border px-3 text-[13px] font-medium transition-[background-color,border-color,color] duration-300', focusRing, on ? 'border-transparent bg-[color-mix(in_oklab,var(--primary)_14%,transparent)] text-foreground' : 'border-border text-muted-foreground hover:bg-accent hover:text-foreground')}>
      <span key={String(on)} className={cn('inline-flex', on && '[animation:kitbio-pop_.45s_var(--ease-kit)]')}>
        <Icon name={on ? 'check' : 'bell'} size={15} className={on ? 'text-primary' : undefined} />
      </span>
      <span className="max-sm:sr-only">{on ? t.reminded : t.remind}</span>
    </button>
  );
}

function EventRow({ e, t }: { e: BioEvent; t: Texts }) {
  const locale = useLocale();
  return (
    <li className="flex items-center gap-3.5 py-3.5">
      <DateBadge iso={e.start} />
      <div className="min-w-0 flex-1">
        <a href={e.href} className={cn('-my-3 block rounded-sm py-3 text-[15px] font-medium text-foreground hover:underline hover:underline-offset-4', focusRing)}>
          {e.title}
        </a>
        <p className="mt-0.5 text-pretty text-[13px] text-muted-foreground">
          {[e.kind, fmt(e.start, locale, { weekday: 'short', hour: 'numeric', minute: '2-digit' }), e.place].filter(Boolean).join(' · ')}
        </p>
        {e.seats !== undefined && e.seats <= 10 && <p className="mt-1 text-[12.5px] font-medium text-warning-foreground">{fill(t.seats, { n: e.seats })}</p>}
      </div>
      <RemindButton t={t} title={e.title} />
    </li>
  );
}

function ProductCard({ p, currency, t, className }: { p: BioProduct; currency: string; t: Texts; className?: string }) {
  const locale = useLocale();
  return (
    <a href={p.href} className={cn('group flex flex-col overflow-hidden rounded-xl border border-border bg-card shadow-[var(--highlight),var(--shadow-sm)] transition-[transform,box-shadow] duration-300 ease-[var(--ease-kit)] hover:-translate-y-1 hover:shadow-[var(--highlight),var(--shadow-md)]', focusRing, className)}>
      <div data-clip-ok className="relative aspect-square overflow-hidden bg-muted">
        <div className={cn('absolute inset-0 transition-transform duration-700 ease-[var(--ease-kit)] group-hover:scale-105 motion-reduce:transition-none', fit)}>{p.image}</div>
      </div>
      <div className="flex flex-1 flex-col p-3.5">
        {p.kind && <span className="text-[12px] text-muted-foreground">{p.kind}</span>}
        <span className="mt-0.5 line-clamp-2 text-[14.5px] font-medium leading-snug text-foreground">{p.title}</span>
        <span className="mt-auto flex items-baseline gap-2 pt-2.5">
          <span className="text-[15px] font-semibold tabular-nums text-foreground">{money(p.price, currency, locale)}</span>
          {p.was && <s className="text-[13px] tabular-nums text-muted-foreground">{money(p.was, currency, locale)}</s>}
          <span className="ml-auto inline-flex items-center gap-1 text-[13px] font-medium text-primary">
            {t.get}
            <Icon name="arrow-right" size={14} className="transition-transform duration-300 group-hover:translate-x-0.5" />
          </span>
        </span>
      </div>
    </a>
  );
}

/** A row of choices with a marker that glides to the active one */
function Switch({ options, value, onChange, label }: { options: { id: string; label: string; count?: number }[]; value: string; onChange: (id: string) => void; label: string }) {
  const wrap = useRef<HTMLDivElement>(null);
  const [box, setBox] = useState<{ x: number; w: number } | null>(null);
  useEffect(() => {
    const el = wrap.current;
    if (!el) return;
    const measure = () => {
      const b = el.querySelector<HTMLElement>('[aria-selected="true"]');
      if (b) setBox({ x: b.offsetLeft, w: b.offsetWidth });
    };
    measure();
    const ro = new ResizeObserver(measure);
    ro.observe(el);
    return () => ro.disconnect();
  }, [value]);
  const key = (e: React.KeyboardEvent) => {
    const d = e.key === 'ArrowRight' ? 1 : e.key === 'ArrowLeft' ? -1 : 0;
    if (!d) return;
    e.preventDefault();
    const i = options.findIndex((o) => o.id === value);
    const n = options[(i + d + options.length) % options.length];
    onChange(n.id);
    wrap.current?.querySelector<HTMLElement>(`[data-v="${n.id}"]`)?.focus();
  };
  return (
    <div ref={wrap} role="tablist" aria-label={label} onKeyDown={key} className="relative flex w-full rounded-xl border border-border bg-muted p-1">
      {box && <span aria-hidden className="absolute bottom-1 left-0 top-1 rounded-lg bg-card shadow-[var(--highlight),var(--shadow-sm)] ring-1 ring-border-strong transition-[transform,width] duration-500 ease-[var(--ease-kit)] motion-reduce:transition-none" style={{ width: box.w, transform: `translateX(${box.x}px)` }} />}
      {options.map((o) => {
        const on = o.id === value;
        return (
          <button key={o.id} id={`bio-tab-${o.id}`} type="button" role="tab" data-v={o.id} aria-selected={on} aria-controls={`bio-panel-${o.id}`} tabIndex={on ? 0 : -1} onClick={() => onChange(o.id)} className={cn('relative z-[1] inline-flex min-h-11 flex-1 items-center justify-center gap-1.5 rounded-lg px-3 text-[14px] font-medium transition-colors', focusRing, on ? 'text-foreground' : 'text-muted-foreground hover:text-foreground', on && !box && 'bg-card shadow-[var(--shadow-sm)]')}>
            {o.label}
            {o.count !== undefined && <span className={cn('rounded-full px-1.5 text-[11.5px] tabular-nums transition-colors', on ? 'bg-[color-mix(in_oklab,var(--primary)_16%,transparent)] text-foreground' : 'bg-background/60 text-muted-foreground')}>{o.count}</span>}
          </button>
        );
      })}
    </div>
  );
}

/** A soft cover behind the column, it drifts slower than the page */
function Backdrop({ cover }: { cover?: React.ReactNode }) {
  if (!cover) return null;
  return (
    <div aria-hidden data-clip-ok className="pointer-events-none absolute left-1/2 top-[-80px] h-[540px] w-screen -translate-x-1/2 overflow-hidden [mask-image:linear-gradient(to_bottom,black_35%,transparent)]">
      <Parallax speed={60} className={cn('absolute -inset-y-10 inset-x-0 opacity-40 blur-3xl saturate-150 dark:opacity-30', fit)}>
        {cover}
      </Parallax>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* stack                                                               */
/* ------------------------------------------------------------------ */

function StackView({ profile, links = [], socials, shareUrl, t }: LinkInBioProps & { t: Texts }) {
  const [first, ...rest] = links;
  const featured = first?.image ? first : undefined;
  const rows = featured ? rest : links;
  return (
    <div className="relative mx-auto w-full max-w-[460px]">
      <div className="absolute right-0 top-0">
        <ShareButton url={shareUrl} t={t} />
      </div>
      <div className="kit-rise">
        <Head profile={profile} />
      </div>
      <Stagger step={70} className="mt-8 grid grid-cols-[minmax(0,1fr)] gap-3">
        {featured && <FeaturedLink link={featured} />}
        {rows.map((l) => (
          <LinkRow key={l.id} link={l} />
        ))}
      </Stagger>
      <div className="mt-8">
        <Socials socials={socials} t={t} />
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* tiles                                                               */
/* ------------------------------------------------------------------ */

function NewsletterTile({ data, t, onSubscribe }: { data: NonNullable<LinkInBioProps['newsletter']>; t: Texts; onSubscribe?: (e: string) => void }) {
  const [email, setEmail] = useState('');
  const [state, setState] = useState<'idle' | 'error' | 'done'>('idle');
  const submit = (e: React.FormEvent) => {
    e.preventDefault();
    if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) return setState('error');
    onSubscribe?.(email);
    setState('done');
  };
  return (
    <div className="flex h-full flex-col">
      <span className="flex size-10 items-center justify-center rounded-xl bg-[color-mix(in_oklab,var(--primary)_14%,transparent)] text-primary">
        <Icon name="mail" size={19} />
      </span>
      <h4 className="mt-4 text-[17px] font-semibold tracking-[-0.01em] text-foreground">{data.title}</h4>
      {data.text && <p className="mt-1.5 text-pretty text-[14px] leading-relaxed text-muted-foreground">{data.text}</p>}
      {state === 'done' ? (
        <p role="status" className="mt-auto flex items-start gap-2 pt-5 text-[14px] font-medium text-foreground [animation:kitbio-swap_.5s_var(--ease-kit)]">
          <Icon name="check-circle" size={18} className="mt-px text-success" />
          {t.subscribed}
        </p>
      ) : (
        <form onSubmit={submit} noValidate className="mt-auto pt-5">
          <label htmlFor="bio-nl" className="sr-only">
            {t.email}
          </label>
          <div className="flex gap-2">
            <input id="bio-nl" type="email" value={email} onChange={(e) => { setEmail(e.target.value); if (state === 'error') setState('idle'); }} placeholder={t.emailPh} aria-invalid={state === 'error'} aria-describedby={state === 'error' ? 'bio-nl-err' : undefined} className={cn('h-11 w-0 min-w-0 flex-1 rounded-lg border bg-background px-3 text-[14px] text-foreground placeholder:text-subtle-foreground', focusRing, state === 'error' ? 'border-destructive' : 'border-border-strong')} />
            <Button type="submit" size="md" className="px-4">
              {t.subscribe}
            </Button>
          </div>
          {state === 'error' && (
            <p id="bio-nl-err" className="mt-2 text-[13px] text-destructive">
              {t.invalid}
            </p>
          )}
          {data.count && <p className="mt-2.5 text-[12.5px] text-muted-foreground">{data.count}</p>}
        </form>
      )}
    </div>
  );
}

function TilesView({ profile, links = [], socials, products = [], events = [], video, newsletter, shareUrl, currency = 'EUR', onSubscribe, t }: LinkInBioProps & { t: Texts }) {
  const locale = useLocale();
  const spot = useSpotlight<HTMLDivElement>();
  const next = events[0];
  const tile = 'kit-card relative overflow-hidden';
  return (
    <Stagger step={60} className="grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-4 lg:gap-4">
      <div className={cn(tile, 'flex flex-col p-6 sm:col-span-2 lg:row-span-2 lg:p-8')}>
        <div className="flex items-start justify-between gap-4">
          <Head profile={profile} size="lg" align="left" />
          <ShareButton url={shareUrl} t={t} />
        </div>
        <div className="mt-5">
          <Socials socials={socials} t={t} align="left" />
        </div>
        {links.length > 0 && (
          <div className="mt-6 border-t border-border pt-3 lg:mt-auto lg:pt-4"><ul className="-mx-3 grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-1">
            {links.map((l) => (
              <li key={l.id}>
                <a href={l.href} className={cn('group flex min-h-12 items-center gap-3 rounded-lg px-3 py-2.5 transition-colors hover:bg-accent', focusRing)}>
                  {l.icon && <Icon name={l.icon} size={17} className="text-muted-foreground transition-colors group-hover:text-primary" />}
                  <span className="line-clamp-2 min-w-0 flex-1 text-[14.5px] font-medium leading-snug text-foreground">{l.label}</span>
                  <Icon name="arrow-up-right" size={15} className="text-muted-foreground transition-transform duration-300 group-hover:-translate-y-0.5 group-hover:translate-x-0.5" />
                </a>
              </li>
            ))}
          </ul></div>
        )}
      </div>
      {video && (
        <a href={video.href} className={cn(tile, 'group min-h-[240px] sm:col-span-2', focusRing)}>
          <div data-clip-ok className={cn('absolute inset-0 bg-muted transition-transform duration-700 ease-[var(--ease-kit)] group-hover:scale-[1.03] motion-reduce:transition-none', fit)}>{video.media}</div>
          <div className="absolute inset-0 bg-[linear-gradient(to_top,rgb(0_0_0/0.82),rgb(0_0_0/0.4)_45%,transparent_80%)]" />
          <span className="absolute left-1/2 top-1/2 flex size-16 -translate-x-1/2 -translate-y-1/2 items-center justify-center rounded-full bg-white/90 text-black shadow-[var(--shadow-lg)] transition-transform duration-500 ease-[var(--ease-kit)] group-hover:scale-110">
            <span aria-hidden className="absolute inset-0 animate-ping rounded-full bg-white/40 [animation-duration:2.4s] motion-reduce:animate-none" />
            <Icon name="play" size={24} className="relative ml-1" />
          </span>
          <div className="absolute inset-x-0 bottom-0 flex items-end justify-between gap-3 p-5 text-white">
            <span>
              <span className="block text-[12.5px] font-medium text-white/80">{t.watch}</span>
              <span className="mt-0.5 block text-[17px] font-semibold leading-snug">{video.title}</span>
            </span>
            {video.length && <span className="shrink-0 rounded-md bg-black/50 px-2 py-1 text-[12.5px] tabular-nums">{video.length}</span>}
          </div>
        </a>
      )}
      {newsletter && (
        <div className={cn(tile, 'p-6')}>
          <NewsletterTile data={newsletter} t={t} onSubscribe={onSubscribe} />
        </div>
      )}
      {next && (
        <div onPointerMove={spot} className={cn(tile, 'kit-spotlight flex flex-col p-6')}>
          <p className="text-[12.5px] font-medium text-muted-foreground">{t.next}</p>
          <div className="mt-3 flex items-center gap-3">
            <DateBadge iso={next.start} />
            <span className="min-w-0">
              <span className="block text-[15.5px] font-semibold leading-snug text-foreground">{next.title}</span>
              <span className="mt-0.5 block text-[13px] text-muted-foreground">{[next.kind, fmt(next.start, locale, { hour: 'numeric', minute: '2-digit' })].filter(Boolean).join(' · ')}</span>
            </span>
          </div>
          {next.seats !== undefined && (
            <div className="mt-5">
              <div className="flex justify-between text-[12.5px]">
                <span className="font-medium text-warning-foreground">{fill(t.seats, { n: next.seats })}</span>
              </div>
              <SeatBar left={next.seats} />
            </div>
          )}
          <span className="mt-auto pt-5" /><Button href={next.href} variant="outline" size="sm" icon="arrow-right" className="self-start max-sm:w-full max-sm:self-stretch">
            {t.join}
          </Button>
        </div>
      )}
      {products.slice(0, 4).map((p) => (
        <ProductCard key={p.id} p={p} currency={currency} t={t} className="max-sm:flex-row [&>div:first-child]:max-sm:aspect-auto [&>div:first-child]:max-sm:w-28" />
      ))}
    </Stagger>
  );
}

/** How full a date is, the bar grows when it scrolls in */
function SeatBar({ left, total = 30 }: { left: number; total?: number }) {
  const [ref, inView] = useInView<HTMLDivElement>();
  const taken = round(Math.min(1, Math.max(0, (total - left) / total)), 3);
  return (
    <div ref={ref} className="mt-2 h-1.5 overflow-hidden rounded-full bg-[color-mix(in_oklab,var(--foreground)_12%,transparent)]" aria-hidden>
      <div className="h-full origin-left rounded-full bg-warning transition-transform duration-1000 ease-[var(--ease-kit)] motion-reduce:transition-none" style={{ transform: `scaleX(${inView ? taken : 0})` }} />
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* tabs                                                                */
/* ------------------------------------------------------------------ */

function TabsView({ profile, links = [], socials, products = [], events = [], shareUrl, currency = 'EUR', t }: LinkInBioProps & { t: Texts }) {
  const opts = [
    { id: 'links', label: t.links, count: links.length },
    ...(products.length ? [{ id: 'shop', label: t.shop, count: products.length }] : []),
    ...(events.length ? [{ id: 'dates', label: t.dates, count: events.length }] : []),
  ];
  const [tab, setTab] = useState('links');
  return (
    <div className="relative mx-auto w-full max-w-[520px]">
      <div className="absolute right-0 top-0">
        <ShareButton url={shareUrl} t={t} />
      </div>
      <div className="kit-rise">
        <Head profile={profile} />
        <div className="mt-6">
          <Socials socials={socials} t={t} />
        </div>
      </div>
      <div className="mt-8">
        <Switch label={t.sections} options={opts} value={tab} onChange={setTab} />
      </div>
      <div key={tab} id={`bio-panel-${tab}`} role="tabpanel" aria-labelledby={`bio-tab-${tab}`} className="mt-5 [animation:kitbio-swap_.45s_var(--ease-kit)]">
        {tab === 'links' && (
          <div className="grid grid-cols-[minmax(0,1fr)] gap-3">
            {links.map((l, i) => (
              <div key={l.id} style={{ animationDelay: `${i * 50}ms` }} className="[animation:kitbio-in_.45s_var(--ease-kit)_both]">
                <LinkRow link={l} />
              </div>
            ))}
          </div>
        )}
        {tab === 'shop' && (
          <div className="grid grid-cols-2 gap-3">
            {products.map((p, i) => (
              <div key={p.id} className="flex [animation:kitbio-in_.45s_var(--ease-kit)_both] [&>a]:w-full" style={{ animationDelay: `${i * 60}ms` }}>
                <ProductCard p={p} currency={currency} t={t} />
              </div>
            ))}
          </div>
        )}
        {tab === 'dates' && (
          <ul className="divide-y divide-border rounded-xl border border-border bg-card px-4">
            {events.map((e) => (
              <EventRow key={e.id} e={e} t={t} />
            ))}
          </ul>
        )}
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* dates                                                               */
/* ------------------------------------------------------------------ */

function DatesView({ profile, links = [], events = [], socials, shareUrl, t }: LinkInBioProps & { t: Texts }) {
  const locale = useLocale();
  const [next, ...later] = events;
  return (
    <div className="relative mx-auto w-full max-w-[520px]">
      <div className="absolute right-0 top-0">
        <ShareButton url={shareUrl} t={t} />
      </div>
      <div className="kit-rise">
        <Head profile={profile} />
      </div>
      {next && (
        <div className="kit-card mt-8 overflow-hidden kit-rise [--kit-delay:120ms]">
          <div className="flex items-center justify-between gap-3 border-b border-border px-5 py-3">
            <span className="inline-flex items-center gap-2 text-[13px] font-medium text-foreground">
              <span className="relative flex size-2">
                <span aria-hidden className="absolute inset-0 animate-ping rounded-full bg-primary opacity-60 motion-reduce:animate-none" />
                <span className="relative size-2 rounded-full bg-primary" />
              </span>
              {t.next}
            </span>
            {next.kind && <span className="text-[12.5px] text-muted-foreground">{next.kind}</span>}
          </div>
          <div className="p-5">
            <h4 className="text-[19px] font-semibold leading-snug tracking-[-0.01em] text-foreground">{next.title}</h4>
            <p className="mt-1 text-[14px] text-muted-foreground">
              {fmt(next.start, locale, { weekday: 'long', day: 'numeric', month: 'long', hour: 'numeric', minute: '2-digit' })}
              {next.place && ` · ${next.place}`}
            </p>
            <p className="mb-2.5 mt-5 text-[12.5px] font-medium text-muted-foreground">{t.in}</p>
            <Countdown iso={next.start} t={t} />
            <div className="mt-5 flex flex-wrap items-center gap-3">
              <Magnetic className="max-sm:flex max-sm:w-full"><Button href={next.href} icon="arrow-right" className="max-sm:w-full">
                {t.join}
              </Button></Magnetic>
              {next.seats !== undefined && <span className="text-[13px] font-medium text-warning-foreground">{fill(t.seats, { n: next.seats })}</span>}
            </div>
          </div>
        </div>
      )}
      {later.length > 0 && (
        <>
          <p className="mb-1 mt-8 text-[13px] font-medium text-muted-foreground">{t.later}</p>
          <Stagger as="ul" step={70} className="divide-y divide-border border-y border-border">
            {later.map((e) => (
              <EventRow key={e.id} e={e} t={t} />
            ))}
          </Stagger>
        </>
      )}
      {links.length > 0 && (
        <Stagger step={60} className="mt-8 grid grid-cols-[minmax(0,1fr)] gap-3">
          {links.map((l) => (
            <LinkRow key={l.id} link={l} />
          ))}
        </Stagger>
      )}
      <div className="mt-8">
        <Socials socials={socials} t={t} />
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* split                                                               */
/* ------------------------------------------------------------------ */

function SplitView({ profile, groups = [], socials, shareUrl, t }: LinkInBioProps & { t: Texts }) {
  return (
    <div className="grid grid-cols-1 gap-10 lg:grid-cols-[minmax(0,5fr)_minmax(0,6fr)] lg:gap-16">
      <div className="lg:sticky lg:top-8 lg:self-start">
        <div className="kit-card relative overflow-hidden">
          <div data-clip-ok className="relative aspect-[4/3] overflow-hidden bg-muted sm:aspect-[16/9] lg:aspect-[5/4]">
            <Parallax speed={50} className={cn('absolute -inset-y-8 inset-x-0', fit)}>
              {profile.cover ?? profile.avatar}
            </Parallax>
            <div className="absolute inset-x-0 bottom-0 h-1/2 bg-[linear-gradient(to_top,rgb(0_0_0/0.6),transparent)]" />
            <div className="absolute right-4 top-4">
              <ShareButton url={shareUrl} t={t} />
            </div>
            <div className="absolute inset-x-0 bottom-0 p-5 text-white sm:p-6">
              <h3 className="text-[26px] font-semibold leading-tight tracking-[-0.02em] sm:text-[30px]">{profile.name}</h3>
              {profile.handle && <p className="mt-1 text-[14.5px] text-white/80">{profile.handle}</p>}
            </div>
          </div>
          <div className="p-5 sm:p-6">
            {profile.bio && <p className="text-pretty text-[15px] leading-relaxed text-foreground/85">{profile.bio}</p>}
            {profile.status && (
              <p className="mt-4 inline-flex min-h-8 items-center gap-2 rounded-full bg-[color-mix(in_oklab,var(--success)_14%,transparent)] px-3 text-[13px] font-medium text-success-foreground">
                <span className="relative flex size-2">
                  <span aria-hidden className="absolute inset-0 animate-ping rounded-full bg-success opacity-60 motion-reduce:animate-none" />
                  <span className="relative size-2 rounded-full bg-success" />
                </span>
                {profile.status}
              </p>
            )}
            <div className="mt-5 border-t border-border pt-5">
              <Socials socials={socials} t={t} align="left" />
            </div>
          </div>
        </div>
      </div>
      <div className="grid grid-cols-1 gap-10">
        {groups.map((g, gi) => (
          <section key={g.title} aria-labelledby={`bio-g-${gi}`}>
            <div className="mb-4 flex items-baseline justify-between gap-3 border-b border-border pb-3">
              <h3 id={`bio-g-${gi}`} className="text-[17px] font-semibold tracking-[-0.01em] text-foreground">
                {g.title}
              </h3>
              <span className="text-[13px] tabular-nums text-muted-foreground">{String(g.links.length).padStart(2, '0')}</span>
            </div>
            <Stagger step={60} className="grid grid-cols-[minmax(0,1fr)] gap-3">
              {g.links.map((l) => (l.image ? <FeaturedLink key={l.id} link={l} /> : <LinkRow key={l.id} link={l} />))}
            </Stagger>
          </section>
        ))}
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* LinkInBio                                                           */
/* ------------------------------------------------------------------ */

/**
 * A link-in-bio page for a person: profile, links, products and dates.
 *   stack  the classic column with a featured link and share
 *   tiles  a bento of profile, video, newsletter, next date, products and links
 *   tabs   links, shop and dates behind a gliding switch
 *   dates  a live countdown to the next date, reminders for the others
 *   split  a portrait that stays while grouped links scroll beside it
 */
export function LinkInBio(props: LinkInBioProps) {
  const { variant = 'stack', labels, className, profile } = props;
  const t = useTexts(TEXTS, labels);
  const narrow = variant === 'stack' || variant === 'tabs' || variant === 'dates';
  const body = (() => {
    switch (variant) {
      case 'tiles':
        return <TilesView {...props} t={t} />;
      case 'tabs':
        return <TabsView {...props} t={t} />;
      case 'dates':
        return <DatesView {...props} t={t} />;
      case 'split':
        return <SplitView {...props} t={t} />;
      default:
        return <StackView {...props} t={t} />;
    }
  })();
  return (
    <Section spacing="sm" className={cn('overflow-clip', className)} background={variant === 'tiles' ? 'surface' : 'default'}>
      <BioMotion />
      {narrow && <Backdrop cover={profile.cover} />}
      <div className="relative">{body}</div>
    </Section>
  );
}