Store screenshots

'use client';

import { useEffect, useRef, useState } from 'react';
import { cn, prefersReducedMotion, round, useInView, useTexts } from '@/lib/kit';
import { Icon } from '@/components/ui/icon';
import { Parallax, useScrollFade } from '@/components/ui/motion';
import { PhoneMockup } from '@/components/ui/mockup';

/*
 * Store screenshots for an app page: the tall frames with a headline and a
 * phone that app stores and landing pages show in a row. No store marks, just
 * the frames, ready for your own screens.
 *
 *   captions   a headline on a tinted ground, the phone rising from the bottom edge
 *   panorama   one long picture across all frames, phones that cross the gaps
 *   tilted     the phone at a slight angle, the headline at the bottom, hover straightens it
 *   badges     small notes that pop up above the phone: a rating, a goal, a new feature
 *   tablet     wide frames with a tablet for tablet sets
 *
 * The row scrolls sideways with drag, arrows and the keyboard, without a
 * visible scrollbar, and fades only where more frames follow.
 */

export type StoreScreenshotsVariant = 'captions' | 'panorama' | 'tilted' | 'badges' | 'tablet';

export interface StoreShot {
  title: string;
  subtitle?: string;
  /** The app screen inside the device */
  screen?: React.ReactNode;
  /** badges: up to three short notes around the phone */
  badges?: string[];
}

export interface StoreScreenshotsProps {
  variant?: StoreScreenshotsVariant;
  shots: StoreShot[];
  /** accent (default) tints the frames with the accent, dark and light are neutral */
  tone?: 'accent' | 'dark' | 'light';
  /** Width of the screen the drawn screens are made for. Default 390. */
  viewport?: number;
  labels?: Partial<(typeof TEXTS)['en']>;
  className?: string;
}

const TEXTS = {
  en: { prev: 'Previous screenshots', next: 'Next screenshots', list: 'Screenshots' },
  de: { prev: 'Vorige Screenshots', next: 'Nächste Screenshots', list: 'Screenshots' },
};

/** One wide picture for the panorama, cut into the frames by background position */
function panorama(tone: StoreScreenshotsProps['tone']) {
  if (tone === 'dark') return 'linear-gradient(100deg, oklch(0.2 0.02 264), oklch(0.28 0.04 264) 50%, oklch(0.18 0.02 264))';
  if (tone === 'light') return 'linear-gradient(100deg, oklch(0.97 0.01 264), oklch(0.92 0.03 264) 50%, oklch(0.97 0.01 264))';
  return 'linear-gradient(100deg, color-mix(in oklab, var(--primary) 80%, black), color-mix(in oklab, var(--primary-2) 75%, black) 50%, color-mix(in oklab, var(--primary) 55%, black))';
}

/** Frame ground per tone. The frames stay the same in light and dark mode, like printed pictures. */
function ground(tone: StoreScreenshotsProps['tone'], i: number) {
  if (tone === 'dark') return { bg: 'linear-gradient(180deg, oklch(0.24 0.02 264), oklch(0.16 0.015 264))', fg: 'oklch(0.98 0 none)', sub: 'oklch(0.8 0.01 264)' };
  if (tone === 'light') return { bg: 'linear-gradient(180deg, oklch(0.975 0.005 264), oklch(0.93 0.01 264))', fg: 'oklch(0.2 0.02 264)', sub: 'oklch(0.45 0.02 264)' };
  const a = i % 2 ? 'var(--primary-2)' : 'var(--primary)';
  return { bg: `linear-gradient(180deg, color-mix(in oklab, ${a} 88%, black), color-mix(in oklab, ${a} 55%, black))`, fg: 'oklch(0.99 0 none)', sub: 'oklch(0.99 0 none / 0.78)' };
}

function Row({ children, label, t, frameWidth }: { children: React.ReactNode; label: string; t: (typeof TEXTS)['en']; frameWidth: number }) {
  const [ref, fade] = useScrollFade<HTMLUListElement>();
  const drag = useRef<{ x: number; left: number; moved: boolean } | null>(null);
  const [canPrev, setPrev] = useState(false);
  const [canNext, setNext] = useState(true);
  useEffect(() => {
    const el = ref.current;
    if (!el) return;
    const update = () => {
      setPrev(el.scrollLeft > 2);
      setNext(el.scrollLeft < el.scrollWidth - el.clientWidth - 2);
    };
    update();
    el.addEventListener('scroll', update, { passive: true });
    window.addEventListener('resize', update);
    return () => {
      el.removeEventListener('scroll', update);
      window.removeEventListener('resize', update);
    };
  }, [ref]);
  const by = (dir: number) => ref.current?.scrollBy({ left: dir * (frameWidth + 16) * 2, behavior: prefersReducedMotion() ? 'auto' : 'smooth' });
  return (
    <div className="relative">
      <ul
        ref={ref}
        aria-label={label}
        tabIndex={0}
        onKeyDown={(e) => {
          if (e.key === 'ArrowRight') by(1);
          if (e.key === 'ArrowLeft') by(-1);
        }}
        onPointerDown={(e) => {
          if (e.pointerType !== 'mouse' || !ref.current) return;
          drag.current = { x: e.clientX, left: ref.current.scrollLeft, moved: false };
        }}
        onPointerMove={(e) => {
          const d = drag.current;
          if (!d || !ref.current) return;
          const dx = e.clientX - d.x;
          if (Math.abs(dx) > 4) d.moved = true;
          ref.current.scrollLeft = d.left - dx;
        }}
        onPointerUp={() => (drag.current = null)}
        onPointerLeave={() => (drag.current = null)}
        className={cn('kit-no-scrollbar flex snap-x snap-mandatory gap-4 overflow-x-auto overscroll-x-contain pb-2 outline-none focus-visible:outline-solid focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-[var(--ring)] [scroll-padding-inline:0px]', fade)}
      >
        {children}
      </ul>
      <div className="mt-5 flex justify-end gap-2">
        {([-1, 1] as const).map((d) => (
          <button
            key={d}
            type="button"
            aria-label={d < 0 ? t.prev : t.next}
            disabled={d < 0 ? !canPrev : !canNext}
            onClick={() => by(d)}
            className="grid size-11 place-items-center rounded-full border border-border bg-card text-foreground shadow-[var(--highlight),var(--shadow-sm)] transition-[opacity,transform,background-color] hover:bg-accent active:scale-95 disabled:opacity-35"
          >
            <Icon name={d < 0 ? 'arrow-left' : 'arrow-right'} size={18} />
          </button>
        ))}
      </div>
    </div>
  );
}

/**
 * A small note that pops up right above the phone. The notes stand in the free band between the
 * heading and the phone and travel with it, so they never cover the screen or the heading.
 * They alternate left and right, which reads like notifications popping out of the device.
 */
function Badge({ text, i, show }: { text: string; i: number; show: boolean }) {
  return (
    <span
      className={cn(
        'max-w-full rounded-2xl bg-[oklch(0.99_0_none)] px-3 py-2 text-[12px] font-semibold leading-tight text-[oklch(0.2_0.02_264)] shadow-[0_10px_30px_-8px_rgb(0_0_0/0.45)] transition-[opacity,transform] duration-700 ease-[cubic-bezier(0.34,1.4,0.64,1)] motion-reduce:transition-none',
        i % 2 ? 'self-end' : 'self-start',
        show ? 'translate-y-0 scale-100 opacity-100' : 'translate-y-3 scale-90 opacity-0',
      )}
      style={{ transitionDelay: show ? `${300 + i * 180}ms` : '0ms' }}
    >
      {text}
    </span>
  );
}

/** A plain tablet drawn around a screen, landscape */
function Tablet({ children, viewport }: { children: React.ReactNode; viewport: number }) {
  const ref = useRef<HTMLDivElement>(null);
  const [scale, setScale] = useState(0.5);
  useEffect(() => {
    const el = ref.current;
    if (!el || typeof ResizeObserver === 'undefined') return;
    const ro = new ResizeObserver(([e]) => setScale(round(e.contentRect.width / (viewport * 1.6), 4)));
    ro.observe(el);
    return () => ro.disconnect();
  }, [viewport]);
  return (
    <div className="rounded-[1.4rem] bg-[oklch(0.16_0.01_264)] p-[3%] shadow-[0_24px_50px_-20px_rgb(0_0_0/0.6),inset_0_0_0_1px_rgb(255_255_255/0.08)]">
      <div ref={ref} data-clip-ok className="relative aspect-[1.6/1] overflow-hidden rounded-[0.8rem] bg-background">
        <div className="absolute left-0 top-0 origin-top-left" style={{ width: viewport * 1.6, height: `${round(100 / scale, 2)}%`, transform: `scale(${scale})` }}>
          {children}
        </div>
      </div>
    </div>
  );
}

/**
 * A row of store screenshot frames.
 *   <StoreScreenshots variant="captions" shots={[{ title: 'Plan your week in one minute', screen: <Screen /> }, …]} />
 */
export function StoreScreenshots({ variant = 'captions', shots, tone = 'accent', viewport = 390, labels, className }: StoreScreenshotsProps) {
  const t = useTexts(TEXTS, labels);
  const [ref, inView] = useInView<HTMLDivElement>();
  const n = shots.length;
  const wide = variant === 'tablet';
  const frameWidth = wide ? 420 : 236;
  const frame = (s: StoreShot, i: number) => {
    const g = ground(tone, variant === 'panorama' ? 0 : i);
    const phone = (
      <PhoneMockup width="100%" viewport={viewport} finish="ink" time="8:30">
        {s.screen}
      </PhoneMockup>
    );
    const heading = (
      <div className={cn('relative z-10', variant === 'tilted' ? 'px-5 pb-6' : 'px-5 pt-6')}>
        <p className="text-balance text-[19px] font-semibold leading-[1.15] tracking-[-0.02em]" style={{ color: g.fg }}>
          {s.title}
        </p>
        {s.subtitle && (
          <p className="mt-1.5 text-pretty text-[12.5px] leading-snug" style={{ color: g.sub }}>
            {s.subtitle}
          </p>
        )}
      </div>
    );
    let inner: React.ReactNode;
    if (variant === 'tablet') {
      inner = (
        <div className="flex h-full flex-col">
          {heading}
          <div className="mt-auto px-6 pb-6">
            <Parallax speed={-24}>
              <Tablet viewport={viewport}>{s.screen}</Tablet>
            </Parallax>
          </div>
        </div>
      );
    } else if (variant === 'tilted') {
      inner = (
        <div className="flex h-full flex-col">
          <div className="relative flex-1">
            <div className={cn('absolute left-1/2 top-[7%] w-[70%] -translate-x-1/2 transition-transform duration-700 ease-[var(--ease-kit)] group-hover/shot:rotate-0 group-focus-within/shot:rotate-0 motion-reduce:transition-none', i % 2 ? 'rotate-[5deg]' : 'rotate-[-5deg]')}>{phone}</div>
          </div>
          {heading}
        </div>
      );
    } else {
      const notes = variant === 'badges' ? (s.badges ?? []).slice(0, 3) : [];
      // With notes the phone moves down and gets a little narrower, the notes take the band above it
      const lift = variant === 'panorama' ? (i % 2 ? 'top-[30%]' : 'top-[22%]') : notes.length > 2 ? 'top-[45%]' : notes.length ? 'top-[40%]' : 'top-[30%]';
      inner = (
        <>
          {heading}
          <div className={cn('absolute left-1/2 -translate-x-1/2', notes.length ? 'w-[72%]' : 'w-[76%]', lift)}>
            <Parallax speed={variant === 'panorama' ? (i % 2 ? -40 : 30) : -28} className="relative">
              {notes.length > 0 && (
                <div className="absolute bottom-full left-[-9%] right-[-9%] z-10 mb-2 flex flex-col gap-1.5">
                  {notes.map((b, k) => <Badge key={b} text={b} i={k} show={inView} />)}
                </div>
              )}
              {phone}
            </Parallax>
          </div>
        </>
      );
    }
    return (
      <li
        key={`${s.title}${i}`}
        className={cn('group/shot relative shrink-0 snap-start overflow-hidden rounded-[1.6rem] shadow-[var(--shadow-md)] transition-[transform,opacity] duration-700 ease-[var(--ease-kit)] motion-reduce:transition-none', !inView && 'translate-y-6 opacity-0')}
        style={{
          width: frameWidth,
          aspectRatio: wide ? '4 / 3' : '9 / 19.5',
          background: variant === 'panorama' ? panorama(tone) : g.bg,
          backgroundSize: variant === 'panorama' ? `${n * 100}% 100%` : undefined,
          backgroundPosition: variant === 'panorama' ? `${n > 1 ? round((i / (n - 1)) * 100, 3) : 0}% 0` : undefined,
          transitionDelay: inView ? `${i * 90}ms` : '0ms',
        }}
        data-clip-ok
      >
        {variant === 'panorama' && (
          <svg aria-hidden className="pointer-events-none absolute inset-0 size-full" viewBox="0 0 100 200" preserveAspectRatio="none">
            {/* One long wave across all frames: each frame draws its own part */}
            <path d={`M0 ${round(150 + Math.sin(i * 1.3) * 18, 2)} C 30 ${round(130 + Math.sin(i * 1.3 + 0.6) * 22, 2)}, 70 ${round(170 + Math.sin(i * 1.3 + 1) * 22, 2)}, 100 ${round(150 + Math.sin((i + 1) * 1.3) * 18, 2)} V200 H0Z`} fill="oklch(1 0 none / 0.1)" />
          </svg>
        )}
        {inner}
      </li>
    );
  };
  return (
    <div ref={ref} className={cn('w-full', className)}>
      <Row label={t.list} t={t} frameWidth={frameWidth}>
        {shots.map(frame)}
      </Row>
    </div>
  );
}