Prompt-Bibliothek

'use client';

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

export type PromptLibraryVariant = 'library' | 'fill-template' | 'team-shared' | 'editor';

export interface PromptVariable {
  /** The name used in the template, {{name}} */
  name: string;
  label: string;
  placeholder?: string;
  /** Offer a choice instead of free text */
  options?: string[];
  value?: string;
}

export interface PromptTemplate {
  id: string;
  title: string;
  description: string;
  category: string;
  icon?: IconName;
  /** The prompt with {{variables}} */
  body?: string;
  variables?: PromptVariable[];
  /** How often the team used it */
  uses?: number;
  author?: string;
  favorite?: boolean;
  visibility?: 'private' | 'team' | 'public';
  /** e.g. "2 days ago" */
  updated?: string;
  version?: number;
}

export interface PromptLibraryProps {
  variant?: PromptLibraryVariant;
  title?: string;
  description?: string;
  templates?: PromptTemplate[];
  /** fill-template and editor: the template to work on */
  template?: PromptTemplate;
  /** editor: categories to choose from */
  categories?: string[];
  onUse?: (prompt: string) => void;
  /** library: where "New prompt" leads, e.g. the editor page */
  newHref?: string;
  /** library: called by "New prompt" when there is no link */
  onNew?: () => void;
  labels?: Partial<(typeof TEXTS)['en']>;
  className?: string;
}

const TEXTS = {
  en: {
    search: 'Search prompts',
    all: 'All',
    favorites: 'Favorites',
    favorite: 'Add {name} to favorites',
    unfavorite: 'Remove {name} from favorites',
    uses: '{n} uses',
    fields: '{n} fields',
    fieldOne: '1 field',
    use: 'Use',
    inChat: 'In the chat',
    none: 'No prompt matches. Try another word or category.',
    newPrompt: 'New prompt',
    fill: 'Fill in',
    preview: 'Prompt',
    missing: '{n} fields left',
    missingOne: '1 field left',
    ready: 'Ready to use',
    copy: 'Copy prompt',
    copied: 'Copied',
    send: 'Use in chat',
    sent: 'Sent to the chat.',
    
    shared: 'Shared prompts',
    visibility: 'Who can see it',
    private: 'Only me',
    team: 'Team',
    public: 'Anyone with the link',
    
    author: 'Owner',
    updated: 'Updated {when}',
    version: 'v{n}',
    share: 'Share',
    copyLink: 'Copy link',
    linkCopied: 'Link copied',
    
    name: 'Name',
    category: 'Category',
    descriptionField: 'Short description',
    body: 'Prompt',
    bodyHint: 'Write {{name}} where something changes each time. Fields appear on their own.',
    detected: 'Fields',
    noFields: 'No fields yet. Type {{ to add one.',
    save: 'Save prompt',
    saved: 'Saved as version {n}.',
    test: 'Test with sample values',
    
    chars: '{n} characters',
  },
  de: {
    search: 'Prompts durchsuchen',
    all: 'Alle',
    favorites: 'Favoriten',
    favorite: '{name} zu Favoriten',
    unfavorite: '{name} aus Favoriten entfernen',
    uses: '{n} Mal genutzt',
    fields: '{n} Felder',
    fieldOne: '1 Feld',
    use: 'Nutzen',
    inChat: 'Im Chat',
    none: 'Kein Prompt passt. Versuch ein anderes Wort oder eine andere Kategorie.',
    newPrompt: 'Neuer Prompt',
    fill: 'Ausfüllen',
    preview: 'Prompt',
    missing: 'Noch {n} Felder offen',
    missingOne: 'Noch 1 Feld offen',
    ready: 'Bereit',
    copy: 'Prompt kopieren',
    copied: 'Kopiert',
    send: 'Im Chat nutzen',
    sent: 'An den Chat gesendet.',
    
    shared: 'Geteilte Prompts',
    visibility: 'Wer es sieht',
    private: 'Nur ich',
    team: 'Team',
    public: 'Alle mit dem Link',
    
    author: 'Erstellt von',
    updated: 'Geändert {when}',
    version: 'v{n}',
    share: 'Teilen',
    copyLink: 'Link kopieren',
    linkCopied: 'Link kopiert',
    
    name: 'Name',
    category: 'Kategorie',
    descriptionField: 'Kurze Beschreibung',
    body: 'Prompt',
    bodyHint: 'Schreib {{name}}, wo sich jedes Mal etwas ändert. Felder erscheinen von selbst.',
    detected: 'Felder',
    noFields: 'Noch keine Felder. Tippe {{, um eines anzulegen.',
    save: 'Prompt speichern',
    saved: 'Als Fassung {n} gespeichert.',
    test: 'Mit Beispielwerten testen',
    
    chars: '{n} Zeichen',
  },
};

type Texts = (typeof TEXTS)['en'];
type P = PromptLibraryProps & { t: Texts };
const fill = (s: string, v: Record<string, string | number>) => s.replace(/\{(\w+)\}/g, (_, k) => String(v[k] ?? ''));

/** State seeded from a prop that starts over when the prop changes (the Studio edits props live) */
function useSynced<T>(value: T) {
  const [state, setState] = useState(value);
  const key = JSON.stringify(value);
  const seen = useRef(key);
  if (seen.current !== key) {
    seen.current = key;
    setState(value);
  }
  return [state, setState] as const;
}

const CSS =
  '@keyframes plb-up{from{opacity:0;transform:translateY(8px)}}@keyframes plb-pop{0%{transform:scale(1)}45%{transform:scale(1.3)}100%{transform:scale(1)}}@keyframes plb-flash{from{background-color:color-mix(in oklab,var(--primary) 30%,transparent)}}' +
  '@media (prefers-reduced-motion:no-preference){.plb-up{animation:plb-up .45s var(--ease-kit) var(--plb-d,0ms) both}.plb-pop{animation:plb-pop .45s var(--ease-kit)}.plb-flash{animation:plb-flash 1.2s ease-out both}}';

function Style() {
  return (
    <style href="kit-prompt-library" precedence="default">
      {CSS}
    </style>
  );
}

/* ------------------------------------------------------------------ */
/* Shared parts                                                        */
/* ------------------------------------------------------------------ */

const VAR = /\{\{\s*([\w-]+)\s*\}\}/g;
const varsOf = (body: string) => Array.from(new Set(Array.from(body.matchAll(VAR), (m) => m[1])));

function Stage({ title, description, children, className, action }: { title?: string; description?: string; children: React.ReactNode; className?: string; action?: React.ReactNode }) {
  return (
    <section className={cn('kit-glow relative overflow-clip bg-surface py-12 sm:py-16 lg:py-20', className)}>
      <div className="kit-container">
        <div className="mx-auto w-full max-w-[68rem]">
          {(title || description || action) && (
            <Reveal className="mb-6 flex flex-col gap-3 sm:mb-8 sm:flex-row sm:items-end sm:justify-between">
              <div>
                {title && <h2 className="text-balance text-[22px] font-semibold leading-tight tracking-[-0.02em] text-foreground sm:text-[26px]">{title}</h2>}
                {description && <p className="mt-2 max-w-[40rem] text-pretty text-[14.5px] leading-relaxed text-muted-foreground">{description}</p>}
              </div>
              {action}
            </Reveal>
          )}
          {children}
        </div>
      </div>
    </section>
  );
}

const card = 'rounded-2xl border border-border bg-card shadow-[var(--highlight),var(--shadow-sm)]';
const primaryBtn = 'inline-flex h-11 items-center justify-center gap-1.5 rounded-lg bg-primary px-4 text-[13.5px] font-medium text-primary-foreground shadow-[inset_0_1px_0_rgb(255_255_255/0.18),var(--shadow-sm)] transition-colors hover:bg-[color-mix(in_oklab,var(--primary)_88%,var(--background))] disabled:bg-[color-mix(in_oklab,var(--foreground)_8%,var(--card))] disabled:text-subtle-foreground disabled:shadow-none sm:h-9';
const quietBtn = 'inline-flex h-11 items-center justify-center gap-1.5 rounded-lg border border-border bg-card px-4 text-[13.5px] font-medium text-foreground transition-colors hover:bg-accent sm:h-9';
const field = 'w-full rounded-lg border border-border bg-background px-3 text-[14px] text-foreground outline-none transition-[border-color,box-shadow] placeholder:text-subtle-foreground focus:border-[color-mix(in_oklab,var(--primary)_55%,var(--border))] focus:shadow-[0_0_0_4px_color-mix(in_oklab,var(--primary)_14%,transparent)] focus-visible:outline-none';

function Tile({ icon, className }: { icon?: IconName; className?: string }) {
  return (
    <span aria-hidden className={cn('grid size-10 shrink-0 place-items-center rounded-xl bg-[color-mix(in_oklab,var(--primary)_12%,var(--card))] text-[color-mix(in_oklab,var(--primary)_75%,var(--foreground))]', className)}>
      <Icon name={icon ?? 'sparkle'} size={19} />
    </span>
  );
}

function Initials({ name }: { name: string }) {
  const hue = (name.charCodeAt(0) * 37 + name.length * 11) % 5;
  const tone = ['--primary', '--success', '--warning', '--info', '--destructive'][hue];
  return (
    <span aria-hidden className="grid size-7 shrink-0 place-items-center rounded-full text-[11px] font-semibold" style={{ background: `color-mix(in oklab, var(${tone}) 18%, var(--card))`, color: `color-mix(in oklab, var(${tone}) 70%, var(--foreground))` }}>
      {name
        .split(' ')
        .map((p) => p[0])
        .slice(0, 2)
        .join('')}
    </span>
  );
}

/** The prompt body with each {{field}} as a chip, filled ones show their value */
function Body({ body, values, className }: { body: string; values?: Record<string, string>; className?: string }) {
  const parts = body.split(/(\{\{\s*[\w-]+\s*\}\})/g);
  return (
    <p className={cn('whitespace-pre-wrap text-pretty text-[14.5px] leading-[1.8] text-foreground', className)}>
      {parts.map((p, i) => {
        const m = /^\{\{\s*([\w-]+)\s*\}\}$/.exec(p);
        if (!m) return <Fragment key={i}>{p}</Fragment>;
        const v = values?.[m[1]];
        return v ? (
          <mark key={`${i}-${v}`} className="plb-flash rounded-[4px] bg-[color-mix(in_oklab,var(--primary)_14%,transparent)] px-0.5 text-foreground [box-decoration-break:clone]">
            {v}
          </mark>
        ) : (
          <span key={i} className="rounded-[4px] border border-dashed border-[color-mix(in_oklab,var(--primary)_45%,var(--border))] px-0.5 text-[13px] text-[color-mix(in_oklab,var(--primary)_70%,var(--foreground))]">
            {m[1]}
          </span>
        );
      })}
    </p>
  );
}

/* ------------------------------------------------------------------ */
/* library                                                             */
/* ------------------------------------------------------------------ */

function Library({ t, title, description, templates = [], onUse, newHref, onNew, className }: P) {
  const locale = useLocale();
  const [list, setList] = useSynced(templates);
  const [cat, setCat] = useState('all');
  const [q, setQ] = useState('');
  const [pop, setPop] = useState<string | null>(null);
  const [used, setUsed] = useState<string | null>(null);
  const [row, fade] = useScrollFade<HTMLDivElement>();
  const cats = Array.from(new Set(list.map((x) => x.category)));
  const shown = list.filter((x) => (cat === 'all' || (cat === 'fav' ? x.favorite : x.category === cat)) && (!q || `${x.title} ${x.description}`.toLowerCase().includes(q.toLowerCase())));
  const nf = (n: number) => n.toLocaleString(locale === 'de' ? 'de-DE' : 'en-US');
  const chip = (id: string, label: string, icon?: IconName) => (
    <button key={id} type="button" aria-pressed={cat === id} onClick={() => setCat(id)} className={cn('inline-flex h-11 min-w-11 shrink-0 items-center justify-center gap-1.5 rounded-lg px-3 text-[13px] font-medium transition-colors focus-visible:-outline-offset-2 sm:h-9', cat === id ? 'bg-foreground text-background' : 'text-muted-foreground hover:bg-accent hover:text-foreground')}>
      {icon && <Icon name={icon} size={14} />}
      {label}
    </button>
  );
  return (
    <Stage
      title={title}
      description={description}
      className={className}
      action={
        newHref ? (
          <a href={newHref} className={cn(primaryBtn, 'self-start sm:self-auto')}>
            <Icon name="plus" size={15} />
            {t.newPrompt}
          </a>
        ) : onNew ? (
          <button type="button" onClick={onNew} className={cn(primaryBtn, 'self-start sm:self-auto')}>
            <Icon name="plus" size={15} />
            {t.newPrompt}
          </button>
        ) : undefined
      }
    >
      <Reveal delay={60}>
        <div className="flex flex-col gap-3 lg:flex-row lg:items-center">
          <label className="flex h-11 items-center gap-2 rounded-xl border border-border bg-card px-3 shadow-[var(--shadow-sm)] focus-within:border-[color-mix(in_oklab,var(--primary)_55%,var(--border))] focus-within:shadow-[var(--shadow-sm),0_0_0_3px_color-mix(in_oklab,var(--primary)_16%,transparent)] lg:w-72">
            <Icon name="search" size={16} className="shrink-0 text-muted-foreground" />
            <span className="sr-only">{t.search}</span>
            <input type="search" value={q} onChange={(e) => setQ(e.target.value)} placeholder={t.search} className="w-0 min-w-0 flex-1 bg-transparent text-[14px] text-foreground outline-none placeholder:text-subtle-foreground focus-visible:outline-none" />
          </label>
          <div ref={row} role="group" aria-label={t.all} className={cn('kit-no-scrollbar -mx-6 flex gap-1 overflow-x-auto px-6 lg:mx-0 lg:px-0', fade)}>
            {chip('all', t.all)}
            {chip('fav', t.favorites, 'star')}
            {cats.map((c) => chip(c, c))}
          </div>
        </div>
      </Reveal>
      {shown.length === 0 ? (
        <p className="plb-up mt-4 rounded-2xl border border-dashed border-border-strong px-6 py-12 text-center text-[13.5px] text-muted-foreground">{t.none}</p>
      ) : (
        <Stagger key={`${cat}-${q}`} as="ul" step={60} className="mt-4 grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-3">
          {shown.map((x) => {
            const n = x.variables?.length ?? varsOf(x.body ?? '').length;
            return (
              <li key={x.id} className={cn(card, 'group relative flex flex-col p-4 transition-[border-color,transform,box-shadow] duration-300 ease-[var(--ease-kit)] hover:-translate-y-0.5 hover:border-border-strong hover:shadow-[var(--highlight),var(--shadow-md)] motion-reduce:hover:translate-y-0')}>
                <div className="flex items-start justify-between gap-3">
                  <Tile icon={x.icon} />
                  <button
                    type="button"
                    aria-pressed={!!x.favorite}
                    aria-label={fill(x.favorite ? t.unfavorite : t.favorite, { name: x.title })}
                    onClick={() => (setList((s) => s.map((y) => (y.id === x.id ? { ...y, favorite: !y.favorite } : y))), setPop(x.id))}
                    className="-m-1.5 grid size-11 place-items-center rounded-lg text-muted-foreground hover:bg-accent sm:size-9"
                  >
                    <Icon key={pop === x.id ? `${x.id}-${x.favorite}` : x.id} name="star" size={17} className={cn(x.favorite && 'fill-[var(--warning)] text-warning-foreground', pop === x.id && 'plb-pop')} />
                  </button>
                </div>
                <p className="mt-3 text-[11.5px] font-medium text-subtle-foreground">{x.category}</p>
                <h3 className="mt-0.5 text-[15.5px] font-semibold leading-snug text-foreground">{x.title}</h3>
                <p className="mt-1 line-clamp-2 text-pretty text-[13.5px] leading-relaxed text-muted-foreground">{x.description}</p>
                <div className="mt-auto flex items-center justify-between gap-3 pt-4">
                  <span className="flex items-center gap-3 text-[12px] tabular-nums text-muted-foreground">
                    {n > 0 && (
                      <span className="inline-flex items-center gap-1">
                        <Icon name="edit" size={12} />
                        {n === 1 ? t.fieldOne : fill(t.fields, { n })}
                      </span>
                    )}
                    {x.uses !== undefined && <span>{fill(t.uses, { n: nf(x.uses) })}</span>}
                  </span>
                  <button type="button" onClick={() => (onUse?.(x.body ?? x.title), setUsed(x.id))} aria-live="polite" className={cn('inline-flex h-11 items-center gap-1 rounded-lg px-2.5 text-[13px] font-medium transition-colors hover:bg-accent sm:h-8', used === x.id ? 'text-success-foreground' : 'text-foreground')}>
                    {used === x.id ? t.inChat : t.use}
                    <Icon name={used === x.id ? 'check' : 'arrow-right'} size={14} className={used === x.id ? 'plb-up' : 'transition-transform duration-300 group-hover:translate-x-0.5'} />
                  </button>
                </div>
              </li>
            );
          })}
        </Stagger>
      )}
    </Stage>
  );
}

/* ------------------------------------------------------------------ */
/* fill-template                                                       */
/* ------------------------------------------------------------------ */

function FillTemplate({ t, title, description, template, onUse, className }: P) {
  const vars = template?.variables ?? [];
  const [values, setValues] = useState<Record<string, string>>(() => Object.fromEntries(vars.map((v) => [v.name, v.value ?? ''])));
  const [done, setDone] = useState<'copy' | 'send' | null>(null);
  const id = useId();
  const open = vars.filter((v) => !values[v.name]?.trim()).length;
  const prompt = (template?.body ?? '').replace(VAR, (_, k) => values[k] || `{{${k}}}`);
  const set = (k: string, v: string) => (setValues((s) => ({ ...s, [k]: v })), setDone(null));

  return (
    <Stage title={title} description={description} className={className}>
      <div className="grid grid-cols-1 gap-4 lg:grid-cols-[minmax(0,22rem)_minmax(0,1fr)] lg:items-start lg:gap-6">
        <Reveal delay={60}>
          <form className={cn(card, 'p-4 sm:p-5')} onSubmit={(e) => e.preventDefault()}>
            <div className="flex items-center gap-3">
              <Tile icon={template?.icon} />
              <div className="min-w-0">
                <p className="truncate text-[15px] font-semibold text-foreground">{template?.title}</p>
                <p className="text-[12.5px] text-muted-foreground">{template?.category}</p>
              </div>
            </div>
            <p className="mb-3 mt-5 text-[12.5px] font-medium text-subtle-foreground">{t.fill}</p>
            <div className="space-y-3.5">
              {vars.map((v) => (
                <div key={v.name}>
                  <label htmlFor={`${id}-${v.name}`} className="mb-1.5 flex items-center justify-between text-[13px] font-medium text-foreground">
                    {v.label}
                    {values[v.name]?.trim() && <Icon name="check" size={14} className="plb-up text-success-foreground" />}
                  </label>
                  {v.options ? (
                    <div id={`${id}-${v.name}`} role="radiogroup" aria-label={v.label} className="flex flex-wrap gap-1.5">
                      {v.options.map((o, oi, all) => (
                        <button
                          key={o}
                          type="button"
                          role="radio"
                          aria-checked={values[v.name] === o}
                          tabIndex={values[v.name] === o || (!all.includes(values[v.name] ?? '') && oi === 0) ? 0 : -1}
                          onClick={() => set(v.name, o)}
                          onKeyDown={(e) => {
                            const d = ['ArrowRight', 'ArrowDown'].includes(e.key) ? 1 : ['ArrowLeft', 'ArrowUp'].includes(e.key) ? -1 : 0;
                            if (!d) return;
                            e.preventDefault();
                            const n = (oi + d + all.length) % all.length;
                            set(v.name, all[n]);
                            (e.currentTarget.parentElement?.children[n] as HTMLElement | undefined)?.focus();
                          }}
                          className={cn('inline-flex min-h-11 items-center rounded-lg border px-3 text-[13px] font-medium transition-colors sm:min-h-9', values[v.name] === o ? 'border-[color-mix(in_oklab,var(--primary)_50%,var(--border))] bg-[color-mix(in_oklab,var(--primary)_12%,var(--card))] text-foreground' : 'border-border text-muted-foreground hover:text-foreground')}>
                          {o}
                        </button>
                      ))}
                    </div>
                  ) : (
                    <input id={`${id}-${v.name}`} value={values[v.name] ?? ''} onChange={(e) => set(v.name, e.target.value)} placeholder={v.placeholder} className={cn(field, 'h-11 sm:h-10')} />
                  )}
                </div>
              ))}
            </div>
          </form>
        </Reveal>
        <Reveal delay={160} className="lg:sticky lg:top-6">
          <div className={card}>
            <div className="flex items-center justify-between gap-3 border-b border-border px-4 py-3 sm:px-5">
              <p className="text-[13px] font-medium text-foreground">{t.preview}</p>
              <span className={cn('inline-flex items-center gap-1.5 text-[12.5px] font-medium', open ? 'text-muted-foreground' : 'text-success-foreground')} aria-live="polite">
                {open ? (open === 1 ? t.missingOne : fill(t.missing, { n: open })) : (
                  <>
                    <Icon name="check-circle" size={14} />
                    {t.ready}
                  </>
                )}
              </span>
            </div>
            <div className="p-4 sm:p-5">
              <Body body={template?.body ?? ''} values={values} />
            </div>
            <div className="flex flex-wrap items-center justify-end gap-2 border-t border-border bg-surface/60 px-4 py-3 sm:px-5">
              {done === 'send' && <span className="plb-up mr-auto text-[13px] text-success-foreground">{t.sent}</span>}
              <button
                type="button"
                disabled={open > 0}
                onClick={() => {
                  navigator.clipboard?.writeText(prompt).catch(() => {});
                  setDone('copy');
                }}
                className={cn(quietBtn, 'disabled:opacity-50')}
              >
                <Icon name={done === 'copy' ? 'check' : 'copy'} size={15} className={done === 'copy' ? 'plb-up text-success-foreground' : undefined} />
                {done === 'copy' ? t.copied : t.copy}
              </button>
              <button type="button" disabled={open > 0} onClick={() => (onUse?.(prompt), setDone('send'))} className={primaryBtn}>
                <Icon name="send" size={15} />
                {t.send}
              </button>
            </div>
          </div>
        </Reveal>
      </div>
    </Stage>
  );
}

/* ------------------------------------------------------------------ */
/* team-shared                                                         */
/* ------------------------------------------------------------------ */

const VIS: Record<NonNullable<PromptTemplate['visibility']>, IconName> = { private: 'lock', team: 'users', public: 'globe' };

function TeamShared({ t, title, description, templates = [], className }: P) {
  const [list, setList] = useSynced(templates);
  const [copied, setCopied] = useState<string | null>(null);
  return (
    <Stage title={title} description={description} className={className}>
      <Reveal delay={60}>
        <div className={card}>
          <div className="hidden grid-cols-[minmax(0,1fr)_9rem_11rem_8.5rem] gap-4 border-b border-border px-5 py-2.5 text-[12px] font-medium text-subtle-foreground lg:grid">
            <span>{t.shared}</span>
            <span>{t.author}</span>
            <span>{t.visibility}</span>
            <span className="text-right">{t.share}</span>
          </div>
          <Stagger as="ul" step={60} className="divide-y divide-border">
            {list.map((x) => (
              <li key={x.id} className="grid grid-cols-[auto_minmax(0,1fr)] gap-x-3 gap-y-3 px-4 py-4 sm:px-5 lg:grid-cols-[minmax(0,1fr)_9rem_11rem_8.5rem] lg:items-center lg:gap-4">
                <div className="col-span-2 flex min-w-0 items-start gap-3 lg:col-span-1">
                  <Tile icon={x.icon} className="size-9" />
                  <div className="min-w-0">
                    <p className="flex items-center gap-2 text-[14.5px] font-medium text-foreground">
                      <span className="truncate">{x.title}</span>
                      {x.version && <span className="shrink-0 rounded-md bg-[color-mix(in_oklab,var(--foreground)_7%,transparent)] px-1.5 py-px text-[11px] tabular-nums text-muted-foreground">{fill(t.version, { n: x.version })}</span>}
                    </p>
                    <p className="truncate text-[12.5px] text-muted-foreground">{x.updated && fill(t.updated, { when: x.updated })}</p>
                  </div>
                </div>
                <span className="col-span-2 flex min-w-0 items-center gap-2 text-[13px] text-muted-foreground lg:col-span-1">
                  {x.author && (
                    <>
                      <Initials name={x.author} />
                      <span className="truncate">{x.author}</span>
                    </>
                  )}
                </span>
                <label className="relative col-span-1 block lg:col-span-1">
                  <span className="sr-only">{`${t.visibility}, ${x.title}`}</span>
                  <Icon name={VIS[x.visibility ?? 'team']} size={15} className="pointer-events-none absolute left-3 top-1/2 -translate-y-1/2 text-muted-foreground" />
                  <select value={x.visibility ?? 'team'} onChange={(e) => setList((s) => s.map((y) => (y.id === x.id ? { ...y, visibility: e.target.value as PromptTemplate['visibility'] } : y)))} className="h-11 w-full appearance-none rounded-lg border border-border bg-background pl-9 pr-8 text-[13.5px] text-foreground hover:border-border-strong sm:h-9">
                    {(['private', 'team', 'public'] as const).map((v) => (
                      <option key={v} value={v}>
                        {t[v]}
                      </option>
                    ))}
                  </select>
                  <Icon name="chevrons-up-down" size={14} className="pointer-events-none absolute right-2.5 top-1/2 -translate-y-1/2 text-muted-foreground" />
                </label>
                <div className="flex justify-end">
                  <button
                    type="button"
                    disabled={x.visibility === 'private'}
                    onClick={() => {
                      navigator.clipboard?.writeText(`https://prompts.example/p/${x.id}`).catch(() => {});
                      setCopied(x.id);
                      window.setTimeout(() => setCopied((c) => (c === x.id ? null : c)), 1800);
                    }}
                    className={cn(quietBtn, 'w-full px-3 disabled:opacity-40 lg:w-auto')}
                  >
                    <Icon name={copied === x.id ? 'check' : 'link'} size={14} className={copied === x.id ? 'plb-up text-success-foreground' : undefined} />
                    {copied === x.id ? t.linkCopied : t.copyLink}
                  </button>
                </div>
              </li>
            ))}
          </Stagger>
        </div>
      </Reveal>
    </Stage>
  );
}

/* ------------------------------------------------------------------ */
/* editor                                                              */
/* ------------------------------------------------------------------ */

function Editor({ t, title, description, template, categories = [], className }: P) {
  const [name, setName] = useState(template?.title ?? '');
  const [desc, setDesc] = useState(template?.description ?? '');
  const [cat, setCat] = useState(template?.category ?? categories[0] ?? '');
  const [body, setBody] = useState(template?.body ?? '');
  const [version, setVersion] = useState(template?.version ?? 1);
  const [saved, setSaved] = useState(false);
  const [test, setTest] = useState(false);
  const id = useId();
  const names = varsOf(body);
  const samples = Object.fromEntries((template?.variables ?? []).map((v) => [v.name, v.value ?? v.placeholder ?? '']));

  return (
    <Stage title={title} description={description} className={className}>
      <div className="grid grid-cols-1 gap-4 lg:grid-cols-[minmax(0,1.3fr)_minmax(0,1fr)] lg:items-start lg:gap-6">
        <Reveal delay={60}>
          <form
            className={cn(card, 'space-y-4 p-4 sm:p-5')}
            onSubmit={(e) => {
              e.preventDefault();
              setVersion((v) => v + 1);
              setSaved(true);
            }}
          >
            <div className="grid grid-cols-1 gap-3 sm:grid-cols-[minmax(0,1fr)_12rem]">
              <label className="block">
                <span className="mb-1.5 block text-[13px] font-medium text-foreground">{t.name}</span>
                <input value={name} onChange={(e) => (setName(e.target.value), setSaved(false))} className={cn(field, 'h-11 sm:h-10')} />
              </label>
              <label className="relative block">
                <span className="mb-1.5 block text-[13px] font-medium text-foreground">{t.category}</span>
                <select value={cat} onChange={(e) => (setCat(e.target.value), setSaved(false))} className={cn(field, 'h-11 appearance-none pr-8 sm:h-10')}>
                  {categories.map((c) => (
                    <option key={c}>{c}</option>
                  ))}
                </select>
                <Icon name="chevrons-up-down" size={14} className="pointer-events-none absolute bottom-3.5 right-2.5 text-muted-foreground sm:bottom-3" />
              </label>
            </div>
            <label className="block">
              <span className="mb-1.5 block text-[13px] font-medium text-foreground">{t.descriptionField}</span>
              <input value={desc} onChange={(e) => (setDesc(e.target.value), setSaved(false))} className={cn(field, 'h-11 sm:h-10')} />
            </label>
            <div>
              <label htmlFor={`${id}-body`} className="mb-1 block text-[13px] font-medium text-foreground">
                {t.body}
              </label>
              <p className="mb-2 text-[12.5px] text-muted-foreground">{t.bodyHint}</p>
              <textarea id={`${id}-body`} rows={7} value={body} onChange={(e) => (setBody(e.target.value), setSaved(false))} className={cn(field, 'resize-y py-3 leading-relaxed')} />
              <p className="mt-1 text-right text-[12px] tabular-nums text-subtle-foreground">{fill(t.chars, { n: body.length })}</p>
            </div>
            <div className="flex flex-wrap items-center justify-between gap-3 border-t border-border pt-4">
              <span aria-live="polite">{saved && <span className="plb-up inline-flex items-center gap-1.5 text-[13px] text-success-foreground"><Icon name="check-circle" size={15} />{fill(t.saved, { n: version })}</span>}</span>
              <button type="submit" disabled={!name.trim() || !body.trim()} className={primaryBtn}>
                {t.save}
              </button>
            </div>
          </form>
        </Reveal>
        <Reveal delay={160} className="space-y-4 lg:sticky lg:top-6">
          <div className={cn(card, 'p-4 sm:p-5')}>
            <p className="text-[13px] font-medium text-foreground">
              {t.detected} <span className="tabular-nums text-muted-foreground">{names.length}</span>
            </p>
            {names.length ? (
              <ul className="mt-3 flex flex-wrap gap-1.5">
                {names.map((n) => (
                  <li key={n} className="plb-up inline-flex h-8 items-center gap-1.5 rounded-lg border border-[color-mix(in_oklab,var(--primary)_40%,var(--border))] bg-[color-mix(in_oklab,var(--primary)_8%,var(--card))] px-2.5 text-[12.5px] font-medium text-[color-mix(in_oklab,var(--primary)_75%,var(--foreground))]">
                    <Icon name="edit" size={12} />
                    {n}
                  </li>
                ))}
              </ul>
            ) : (
              <p className="mt-2 text-[13px] text-muted-foreground">{t.noFields}</p>
            )}
          </div>
          <div className={card}>
            <div className="flex items-center justify-between gap-3 border-b border-border px-4 py-2.5 sm:px-5">
              <p className="text-[13px] font-medium text-foreground">{t.preview}</p>
              <label className="inline-flex min-h-11 cursor-pointer items-center gap-2 text-[12.5px] text-muted-foreground sm:min-h-8">
                <input type="checkbox" checked={test} onChange={(e) => setTest(e.target.checked)} className="size-4 accent-[var(--primary)]" />
                {t.test}
              </label>
            </div>
            <div className="p-4 sm:p-5">
              <Body body={body} values={test ? samples : undefined} className="text-[14px]" />
            </div>
          </div>
        </Reveal>
      </div>
    </Stage>
  );
}

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

/**
 * A prompt library: templates by category with search and favorites,
 * filling a template's fields with a live preview, shared prompts with
 * owner, version and visibility, and an editor that finds the fields as
 * you type them.
 */
export function PromptLibrary({ variant = 'library', labels, ...props }: PromptLibraryProps) {
  const t = useTexts(TEXTS, labels);
  const p: P = { ...props, t };
  const body = (() => {
    switch (variant) {
      case 'fill-template':
        // A new template from the Studio starts the form over
        return <FillTemplate key={JSON.stringify(props.template)} {...p} />;
      case 'team-shared':
        return <TeamShared {...p} />;
      case 'editor':
        return <Editor key={JSON.stringify(props.template)} {...p} />;
      default:
        return <Library {...p} />;
    }
  })();
  return (
    <>
      <Style />
      {body}
    </>
  );
}