Testimonial wall

'use client';

import { useId, useMemo, useState } from 'react';
import { cn, round, useInView, useLocale, useTexts } from '@/lib/kit';
import { Button } from '@/components/ui/button';
import { Icon } from '@/components/ui/icon';
import { Eyebrow, Section } from '@/components/ui/section';

/*
 * A wall of voices: many short quotes at once, so the amount itself is the
 * proof. People are drawn as monograms unless you pass a portrait. Mark the
 * phrase that matters with *stars* in the quote. Four layouts:
 *
 *   masonry-filter  cards in columns of different heights, filter chips, show more
 *   columns-drift   three columns that drift upward at their own pace, pausable
 *   rating-wall     the average with its distribution beside short rated quotes, sortable
 *   highlight-scroll large quotes whose key phrase lights up while scrolling, with figures between
 */

export type SocialProofWallVariant = 'masonry-filter' | 'columns-drift' | 'rating-wall' | 'highlight-scroll';

export interface ProofQuote {
  /** The quote. *Words between stars* are highlighted. */
  quote: string;
  name: string;
  role?: string;
  /** 1 to 5 */
  rating?: number;
  /** Used by the filter, e.g. Agencies */
  tag?: string;
  /** As text, e.g. 2 weeks ago */
  date?: string;
  /** Sort key for newest first, larger is newer */
  order?: number;
  /** Where it was said, e.g. Review, Email, Survey */
  source?: string;
  avatar?: React.ReactNode;
}

export interface SocialProofWallProps {
  variant?: SocialProofWallVariant;
  eyebrow?: React.ReactNode;
  title: React.ReactNode;
  description?: React.ReactNode;
  items: ProofQuote[];
  /** masonry-filter: cards shown before "show more" */
  initial?: number;
  /** rating-wall: the average, the count and the share per star from 5 to 1 */
  rating?: { value: number; count: number; distribution: number[] };
  /** highlight-scroll: figures placed between the quotes */
  stats?: { value: string; label: string }[];
  cta?: { label: string; href: string };
  labels?: Partial<Texts>;
  className?: string;
}

const TEXTS = {
  en: {
    all: 'All',
    filter: 'Filter by group',
    more: 'Show {n} more',
    pause: 'Pause the wall',
    play: 'Play the wall',
    outOf: 'out of 5',
    reviews: '{n} reviews',
    stars: '{n} stars',
    sort: 'Sort',
    newest: 'Newest',
    best: 'Highest rated',
    rated: 'Rated {n} out of 5',
    shown: '{n} of {t} voices shown',
  },
  de: {
    all: 'Alle',
    filter: 'Nach Gruppe filtern',
    more: '{n} weitere zeigen',
    pause: 'Wand anhalten',
    play: 'Wand abspielen',
    outOf: 'von 5',
    reviews: '{n} Bewertungen',
    stars: '{n} Sterne',
    sort: 'Sortieren',
    newest: 'Neueste',
    best: 'Beste Bewertung',
    rated: 'Mit {n} von 5 bewertet',
    shown: '{n} von {t} Stimmen sichtbar',
  },
};

type Texts = (typeof TEXTS)['en'];
type ViewProps = SocialProofWallProps & { t: Texts };

const fill = (s: string, v: Record<string, string | number>) => s.replace(/\{(\w+)\}/g, (_, k) => String(v[k] ?? ''));
const delay = (ms: number) => ({ '--kit-delay': `${ms}ms` }) as React.CSSProperties;
const initials = (n: string) =>
  n
    .split(/\s+/)
    .map((w) => w[0])
    .slice(0, 2)
    .join('')
    .toUpperCase();

/** Text with *marks*. lit lights the marks (used while scrolling), always lit otherwise. */
function Quote({ text, lit = true, className }: { text: string; lit?: boolean; className?: string }) {
  const parts = text.split(/\*([^*]+)\*/g);
  return (
    <span className={className}>
      {parts.map((s, i) =>
        i % 2 ? (
          <mark
            key={i}
            className="rounded-[0.2em] bg-transparent bg-[linear-gradient(color-mix(in_oklab,var(--primary)_22%,transparent),color-mix(in_oklab,var(--primary)_22%,transparent))] bg-no-repeat px-[0.08em] text-foreground transition-[background-size] duration-1000 ease-[var(--ease-kit)] [box-decoration-break:clone] motion-reduce:transition-none"
            style={{ backgroundSize: lit ? '100% 100%' : '0% 100%' }}
          >
            {s}
          </mark>
        ) : (
          s
        ),
      )}
    </span>
  );
}

function Person({ q, size = 'md' }: { q: ProofQuote; size?: 'md' | 'lg' }) {
  const tone = [16, 26, 36, 22, 30][q.name.length % 5];
  return (
    <span className="flex min-w-0 items-center gap-3">
      <span
        aria-hidden
        className={cn('grid shrink-0 place-items-center overflow-hidden rounded-full font-semibold text-foreground [&>*]:size-full [&>*]:object-cover', size === 'lg' ? 'size-12 text-[14px]' : 'size-9 text-[12px]')}
        style={{ background: `color-mix(in oklab, var(--primary) ${tone}%, var(--card))` }}
      >
        {q.avatar ?? initials(q.name)}
      </span>
      <span className="min-w-0">
        <span className="block truncate text-[14px] font-semibold text-foreground">{q.name}</span>
        {q.role && <span className="block truncate text-[12.5px] text-muted-foreground">{q.role}</span>}
      </span>
    </span>
  );
}

function Stars({ value, size = 14, label }: { value: number; size?: number; label?: string }) {
  return (
    <span className="flex gap-0.5" role={label ? 'img' : undefined} aria-label={label} aria-hidden={label ? undefined : true}>
      {Array.from({ length: 5 }, (_, i) => {
        const f = Math.max(0, Math.min(1, value - i));
        return (
          <span key={i} className="relative" style={{ width: size, height: size }}>
            <Icon name="star" size={size} className="absolute inset-0 text-[color-mix(in_oklab,var(--foreground)_20%,transparent)]" />
            <span data-clip-ok className="absolute inset-0 overflow-hidden" style={{ width: `${round(f * 100)}%` }}>
              <Icon name="star" size={size} className="fill-current text-[color-mix(in_oklab,var(--warning)_85%,var(--foreground))]" />
            </span>
          </span>
        );
      })}
    </span>
  );
}

function Head({ eyebrow, title, description, center, className }: Pick<SocialProofWallProps, 'eyebrow' | 'title' | 'description'> & { center?: boolean; className?: string }) {
  return (
    <div className={cn('max-w-[46rem]', center && 'mx-auto max-w-[42rem] text-center', className)}>
      {eyebrow && <Eyebrow>{eyebrow}</Eyebrow>}
      <h2 className="kit-rise text-balance text-h2 font-semibold text-foreground">{title}</h2>
      {description && (
        <p className={cn('kit-rise mt-5 max-w-[36rem] text-pretty text-lead text-muted-foreground', center && 'mx-auto')} style={delay(80)}>
          {description}
        </p>
      )}
    </div>
  );
}

function Card({ q, t, className, style }: { q: ProofQuote; t: Texts; className?: string; style?: React.CSSProperties }) {
  return (
    <figure className={cn('rounded-2xl border border-border bg-card p-5 shadow-[var(--highlight),var(--shadow-sm)] transition-[box-shadow,border-color] duration-300 hover:border-border-strong hover:shadow-[var(--highlight),var(--shadow-md)]', className)} style={style}>
      {q.rating !== undefined && <Stars value={q.rating} label={fill(t.rated, { n: q.rating })} />}
      <blockquote className={cn('text-pretty text-[15px] leading-relaxed text-foreground', q.rating !== undefined && 'mt-3')}>
        <Quote text={q.quote} />
      </blockquote>
      <figcaption className="mt-4 flex items-center justify-between gap-3">
        <Person q={q} />
        {(q.source || q.date) && <span className="shrink-0 text-right text-[12px] text-subtle-foreground">{q.date ?? q.source}</span>}
      </figcaption>
    </figure>
  );
}

/* ------------------------------------------------------------------ */
/* masonry-filter                                                      */
/* ------------------------------------------------------------------ */

function MasonryFilter(p: ViewProps) {
  const { t } = p;
  const tags = useMemo(() => [...new Set(p.items.map((i) => i.tag).filter(Boolean))] as string[], [p.items]);
  const [tag, setTag] = useState<string | null>(null);
  const [shown, setShown] = useState(p.initial ?? 9);
  const list = p.items.filter((i) => !tag || i.tag === tag);
  const visible = list.slice(0, shown);
  const rest = list.length - visible.length;
  return (
    <Section className={p.className}>
      <Head {...p} center />
      {tags.length > 0 && (
        <div role="group" aria-label={t.filter} className="kit-rise mt-10 flex flex-wrap justify-center gap-2" style={delay(120)}>
          {[null, ...tags].map((x) => (
            <button
              key={x ?? 'all'}
              type="button"
              aria-pressed={tag === x}
              onClick={() => setTag(x)}
              className={cn(
                'inline-flex min-h-11 cursor-pointer items-center gap-2 rounded-full border px-4 text-[14px] font-medium transition-[background-color,border-color,color] duration-200 focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-solid focus-visible:outline-primary sm:min-h-9',
                tag === x ? 'border-foreground bg-foreground text-background' : 'border-border text-muted-foreground hover:border-border-strong hover:text-foreground',
              )}
            >
              {x ?? t.all}
              <span className="text-[12px] tabular-nums opacity-70">{x ? p.items.filter((i) => i.tag === x).length : p.items.length}</span>
            </button>
          ))}
        </div>
      )}
      <p role="status" className="sr-only">
        {fill(t.shown, { n: visible.length, t: list.length })}
      </p>
      <div className="mt-10 columns-1 gap-4 sm:columns-2 lg:columns-3">
        {visible.map((q, i) => (
          <Card key={`${tag}-${q.name}-${i}`} q={q} t={t} className="kit-rise mb-4 break-inside-avoid" style={delay(Math.min(i, 8) * 50)} />
        ))}
      </div>
      {(rest > 0 || p.cta) && (
        <div className="mt-8 flex flex-col items-center justify-center gap-3 sm:flex-row">
          {rest > 0 && (
            <Button variant="outline" icon="chevron-down" onClick={() => setShown((n) => n + (p.initial ?? 9))}>
              {fill(t.more, { n: Math.min(rest, p.initial ?? 9) })}
            </Button>
          )}
          {p.cta && (
            <Button href={p.cta.href} icon="arrow-right">
              {p.cta.label}
            </Button>
          )}
        </div>
      )}
    </Section>
  );
}

/* ------------------------------------------------------------------ */
/* columns-drift                                                       */
/* ------------------------------------------------------------------ */

const LAYOUTS = [
  { n: 1, className: 'sm:hidden' },
  { n: 2, className: 'max-sm:hidden lg:hidden' },
  { n: 3, className: 'max-lg:hidden' },
];

function ColumnsDrift(p: ViewProps) {
  const { t } = p;
  const [paused, setPaused] = useState(false);
  const speeds = [46, 58, 40];
  return (
    <Section background="surface" className={p.className}>
      <div className="flex flex-col gap-6 sm:flex-row sm:items-end sm:justify-between">
        <Head {...p} />
        <button
          type="button"
          onClick={() => setPaused(!paused)}
          className="inline-flex min-h-11 shrink-0 cursor-pointer items-center gap-2 self-start rounded-lg border border-border bg-card px-4 text-[14px] font-medium text-foreground shadow-[var(--shadow-sm)] transition-colors hover:bg-accent focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-solid focus-visible:outline-primary motion-reduce:hidden sm:self-auto"
        >
          <Icon name={paused ? 'play' : 'pause'} size={15} />
          {paused ? t.play : t.pause}
        </button>
      </div>
      <div className="group/wall relative mt-12 h-[44rem] overflow-hidden [mask-image:linear-gradient(to_bottom,transparent,black_12%,black_88%,transparent)] motion-reduce:h-auto motion-reduce:[mask-image:none]">
        {/* one, two or three columns by screen width, so every voice is on the wall at every size */}
        {LAYOUTS.map(({ n, className }) => (
          <div key={n} className={cn('grid h-full gap-4', n === 1 && 'grid-cols-[minmax(0,1fr)]', n === 2 && 'grid-cols-2', n === 3 && 'grid-cols-3', className)}>
            {Array.from({ length: n }, (_, c) => p.items.filter((_, i) => i % n === c)).map((col, c) => (
              <div key={c} className="relative min-w-0">
                <div
                  className={cn('flex flex-col gap-4 motion-reduce:animate-none', 'animate-[spw-up_var(--d)_linear_infinite] group-hover/wall:[animation-play-state:paused] group-focus-within/wall:[animation-play-state:paused]', paused && '[animation-play-state:paused]')}
                  // the same pace per card in every layout: a longer column takes longer
                  style={{ '--d': `${round((speeds[c % 3] / 4) * Math.max(1, col.length), 1)}s`, animationDelay: `${-c * 7}s` } as React.CSSProperties}
                >
                  {col.map((q, i) => (
                    <Card key={i} q={q} t={t} />
                  ))}
                  {/* the copy that makes the loop seamless, hidden from screen readers */}
                  <div aria-hidden className="flex flex-col gap-4 motion-reduce:hidden">
                    {col.map((q, i) => (
                      <Card key={i} q={q} t={t} />
                    ))}
                  </div>
                </div>
              </div>
            ))}
          </div>
        ))}
      </div>
      <style>{'@keyframes spw-up{to{transform:translateY(calc(-50% - 0.5rem))}}'}</style>
      {p.cta && (
        <div className="mt-10 flex justify-center">
          <Button href={p.cta.href} size="lg" icon="arrow-right" className="max-sm:w-full">
            {p.cta.label}
          </Button>
        </div>
      )}
    </Section>
  );
}

/* ------------------------------------------------------------------ */
/* rating-wall                                                         */
/* ------------------------------------------------------------------ */

function RatingWall(p: ViewProps) {
  const { t } = p;
  const locale = useLocale();
  const [sort, setSort] = useState<'newest' | 'best'>('newest');
  const sortId = useId();
  const [ref, inView] = useInView<HTMLDivElement>();
  const r = p.rating;
  const loc = locale === 'de' ? 'de-DE' : 'en-US';
  const list = [...p.items].sort((a, b) => (sort === 'best' ? (b.rating ?? 0) - (a.rating ?? 0) : (b.order ?? 0) - (a.order ?? 0)));
  return (
    <Section className={p.className}>
      <div className="grid grid-cols-[minmax(0,1fr)] gap-12 lg:grid-cols-[minmax(0,20rem)_minmax(0,1fr)] lg:gap-14">
        <div className="lg:sticky lg:top-24 lg:self-start">
          <Head {...p} />
          {r && (
            <div ref={ref} className="kit-rise mt-8 rounded-2xl border border-border bg-card p-6 shadow-[var(--highlight),var(--shadow-sm)]" style={delay(120)}>
              <div className="flex items-end gap-3">
                <span className="text-[56px] font-semibold leading-none tabular-nums tracking-[-0.05em] text-foreground">{new Intl.NumberFormat(loc, { minimumFractionDigits: 1 }).format(r.value)}</span>
                <span className="pb-1.5">
                  <Stars value={r.value} size={16} />
                  <span className="mt-1 block text-[13px] text-muted-foreground">{fill(t.reviews, { n: new Intl.NumberFormat(loc).format(r.count) })}</span>
                </span>
              </div>
              <ul className="mt-6 grid gap-2">
                {r.distribution.map((share, i) => (
                  <li key={i} className="grid grid-cols-[2.25rem_minmax(0,1fr)_2.75rem] items-center gap-3 text-[12.5px] text-muted-foreground">
                    <span className="flex items-center gap-1 tabular-nums">
                      {5 - i}
                      <Icon name="star" size={11} className="fill-current" />
                      <span className="sr-only">{fill(t.stars, { n: 5 - i })}</span>
                    </span>
                    <span className="h-2 overflow-hidden rounded-full bg-track">
                      <span className="block h-full origin-left rounded-full bg-[color-mix(in_oklab,var(--warning)_85%,var(--foreground))] transition-transform duration-1000 ease-[var(--ease-kit)] motion-reduce:transition-none" style={{ transform: `scaleX(${inView ? round(share / 100, 3) : 0})`, transitionDelay: `${i * 80}ms` }} />
                    </span>
                    <span className="text-right tabular-nums">{new Intl.NumberFormat(loc).format(share)}{locale === 'de' ? ' %' : '%'}</span>
                  </li>
                ))}
              </ul>
            </div>
          )}
          {p.cta && (
            <Button href={p.cta.href} variant="outline" icon="arrow-right" className="mt-6 max-sm:w-full">
              {p.cta.label}
            </Button>
          )}
        </div>
        <div className="min-w-0">
          <div className="flex items-center justify-end gap-2">
            <span id={sortId} className="text-[13px] text-muted-foreground">
              {t.sort}
            </span>
            <div role="radiogroup" aria-labelledby={sortId} className="inline-flex gap-1 rounded-lg bg-surface p-1">
              {(['newest', 'best'] as const).map((k) => (
                <button
                  key={k}
                  type="button"
                  role="radio"
                  aria-checked={sort === k}
                  tabIndex={sort === k ? 0 : -1}
                  onClick={() => setSort(k)}
                  onKeyDown={(e) => {
                    if (!['ArrowLeft', 'ArrowRight', 'ArrowUp', 'ArrowDown'].includes(e.key)) return;
                    e.preventDefault();
                    const next = sort === 'newest' ? 'best' : 'newest';
                    setSort(next);
                    e.currentTarget.parentElement?.querySelectorAll<HTMLElement>('[role="radio"]')[next === 'newest' ? 0 : 1]?.focus();
                  }}
                  className={cn('h-11 cursor-pointer rounded-md px-3 text-[13px] font-medium transition-[background-color,color,box-shadow] focus-visible:outline-2 focus-visible:outline-solid focus-visible:outline-primary sm:h-8', sort === k ? 'bg-card text-foreground shadow-[var(--highlight),var(--shadow-sm)]' : 'text-muted-foreground hover:text-foreground')}
                >
                  {t[k]}
                </button>
              ))}
            </div>
          </div>
          <ul className="mt-4 grid grid-cols-[minmax(0,1fr)] gap-3 md:grid-cols-2">
            {list.map((q, i) => (
              <li key={`${sort}-${q.name}`} className="kit-rise" style={delay(Math.min(i, 6) * 50)}>
                <Card q={q} t={t} className="h-full" />
              </li>
            ))}
          </ul>
        </div>
      </div>
    </Section>
  );
}

/* ------------------------------------------------------------------ */
/* highlight-scroll                                                    */
/* ------------------------------------------------------------------ */

function BigQuote({ q, index }: { q: ProofQuote; index: number }) {
  const [ref, inView] = useInView<HTMLElement>('0px 0px -35% 0px');
  const right = index % 2 === 1;
  return (
    <figure ref={ref} className={cn('max-w-[44rem]', right && 'sm:ml-auto sm:text-right')}>
      <Icon name="quote" size={28} className={cn('text-[color-mix(in_oklab,var(--primary)_60%,var(--muted-foreground))]', right && 'sm:ml-auto')} />
      <blockquote className="mt-4 text-balance text-[clamp(1.4rem,1.1rem+1.2vw,2rem)] font-medium leading-[1.3] tracking-[-0.015em] text-muted-foreground">
        <Quote text={q.quote} lit={inView} className="[&_mark]:font-semibold" />
      </blockquote>
      <figcaption className={cn('mt-6 flex', right && 'sm:justify-end')}>
        <Person q={q} size="lg" />
      </figcaption>
    </figure>
  );
}

function HighlightScroll(p: ViewProps) {
  const stats = p.stats ?? [];
  return (
    <Section className={p.className}>
      <Head {...p} />
      <div className="mt-16 grid gap-16 sm:gap-20">
        {p.items.map((q, i) => (
          <div key={i} className="grid gap-16 sm:gap-20">
            <BigQuote q={q} index={i} />
            {stats[i] && i < p.items.length - 1 && (
              <div className="kit-rise flex items-baseline justify-center gap-4 border-y border-border py-8 text-center max-sm:flex-col max-sm:items-center max-sm:gap-1">
                <span className="text-[clamp(2.5rem,2rem+2vw,3.75rem)] font-semibold leading-none tracking-[-0.04em] text-foreground">{stats[i].value}</span>
                <span className="max-w-[20rem] text-pretty text-[15px] leading-snug text-muted-foreground sm:text-left sm:text-[16px]">{stats[i].label}</span>
              </div>
            )}
          </div>
        ))}
      </div>
      {p.cta && (
        <div className="mt-16 flex justify-center">
          <Button href={p.cta.href} size="lg" icon="arrow-right" className="max-sm:w-full">
            {p.cta.label}
          </Button>
        </div>
      )}
    </Section>
  );
}

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

const VIEWS: Record<SocialProofWallVariant, (p: ViewProps) => React.ReactNode> = {
  'masonry-filter': MasonryFilter,
  'columns-drift': ColumnsDrift,
  'rating-wall': RatingWall,
  'highlight-scroll': HighlightScroll,
};

export function SocialProofWall({ variant = 'masonry-filter', labels, ...rest }: SocialProofWallProps) {
  const t = useTexts(TEXTS, labels);
  const View = VIEWS[variant] ?? MasonryFilter;
  return <View {...rest} variant={variant} t={t} />;
}