Link Preview

'use client'

import { useEffect, useState } from 'react'
import './link-preview.css'

export interface LinkMeta { title: string; description?: string; site: string; image?: boolean }

export interface LinkPreviewProps {
  resolve: (url: string) => Promise<LinkMeta>
  url?: string
  size?: 'large' | 'compact'
  fill?: 'dark' | 'light'
  className?: string
}

const Art = () => (
  <svg viewBox="0 0 190 100" preserveAspectRatio="xMidYMid slice" aria-hidden>
    <rect width="190" height="100" fill="currentColor" opacity="0.08" />
    {[0, 1, 2, 3, 4].map((i) => <rect key={i} x={14 + i * 34} y={60 - i * 8} width="26" height={26 + i * 8} rx="4" fill="currentColor" opacity={0.2 + i * 0.15} />)}
    <circle cx="160" cy="24" r="10" fill="currentColor" opacity="0.6" />
  </svg>
)

/** URL unfurl card with edit and layout toggle. */
export function LinkPreview({ resolve, url: u0 = '', size: s0 = 'large', fill = 'dark', className }: LinkPreviewProps) {
  const [url, setUrl] = useState(u0)
  const [meta, setMeta] = useState<LinkMeta | null>(null)
  const [busy, setBusy] = useState(false)
  const [err, setErr] = useState('')
  const [size, setSize] = useState(s0)
  const [edit, setEdit] = useState(false)
  const go = async (u = url) => {
    if (!/^https?:\/\/\S+\.\S+/.test(u.trim())) { setErr('That does not look like a link.'); setMeta(null); return }
    setErr(''); setBusy(true); setMeta(null)
    try { setMeta(await resolve(u.trim())) } catch { setErr('Could not load a preview for that link.') }
    setBusy(false)
  }
  useEffect(() => { if (u0) go(u0) }, []) // eslint-disable-line react-hooks/exhaustive-deps
  return (
    <div className={['sd-lnk', className].filter(Boolean).join(' ')} data-fill={fill}>
      <form onSubmit={(e) => { e.preventDefault(); go() }}><input aria-label="Link" placeholder="Paste a link" value={url} onChange={(e) => setUrl(e.target.value)} onPaste={(e) => { const t = e.clipboardData.getData('text'); setTimeout(() => go(t), 0) }} /><button type="submit">Preview</button></form>
      <div aria-live="polite" aria-busy={busy}>
        {busy && <div className="sd-lnk__sk" aria-label="Loading preview"><i /><i style={{ width: '40%' }} /><i /><i style={{ width: '70%' }} /></div>}
        {err && <div className="sd-lnk__err" role="alert">{err}</div>}
        {meta && (
          <article className="sd-lnk__c" data-size={size}>
            {meta.image && <div className="sd-lnk__img"><Art /></div>}
            <div className="sd-lnk__b"><small>{meta.site}</small><a href={url} onClick={(e) => e.preventDefault()}>{meta.title}</a>{meta.description && <p>{meta.description}</p>}</div>
            <button type="button" className="sd-lnk__x" aria-label="Remove preview" onClick={() => setMeta(null)}>×</button>
          </article>
        )}
      </div>
      {meta && edit && <div className="sd-lnk__ed"><input aria-label="Preview title" value={meta.title} onChange={(e) => setMeta({ ...meta, title: e.target.value })} /><input aria-label="Preview description" value={meta.description ?? ''} onChange={(e) => setMeta({ ...meta, description: e.target.value })} /></div>}
      {meta && <div className="sd-lnk__bar"><button type="button" onClick={() => setEdit((x) => !x)}>{edit ? 'Done editing' : 'Edit text'}</button><button type="button" onClick={() => setSize(size === 'large' ? 'compact' : 'large')}>{size === 'large' ? 'Compact' : 'Large'} layout</button></div>}
    </div>
  )
}

.sd-lnk { --bg: #1c1c1c; --fg: #f6f6f6; --mute: #8e8e8e; --line: rgb(255 255 255 / 0.1); --soft: rgb(255 255 255 / 0.07); --strong: #fafafa; --on: #111; 
  color: var(--fg); font-size: 14px; line-height: 1.4; -webkit-tap-highlight-color: transparent; }
.sd-lnk[data-fill='light'] { --bg: #fff; --fg: #121212; --mute: #6f6f6f; --line: rgb(0 0 0 / 0.09); --soft: rgb(0 0 0 / 0.05); --strong: #111; --on: #fff; }
.sd-lnk :where(button) { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
.sd-lnk :focus-visible { outline: 2px solid var(--fg); outline-offset: 2px; }
.sd-lnk .sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.sd-lnk { width: min(100%, 340px); padding: 14px; grid-template-columns: minmax(0, 1fr); border-radius: 18px; background: var(--bg); box-shadow: inset 0 0 0 1px var(--line); display: grid; gap: 10px; }
.sd-lnk form { display: flex; gap: 6px; }
.sd-lnk form input { flex: 1; min-width: 0; height: 38px; padding: 0 12px; border: 0; border-radius: 10px; background: var(--soft); color: var(--fg); font: 12.5px ui-monospace, monospace; outline: 0; }
.sd-lnk form input:focus { box-shadow: inset 0 0 0 1.5px var(--fg); }
.sd-lnk form button { padding: 0 14px; border-radius: 10px; font-size: 13px; font-weight: 600; background: var(--strong) !important; color: var(--on) !important; }
.sd-lnk__c { position: relative; border-radius: 14px; overflow: hidden; box-shadow: inset 0 0 0 1px var(--line); animation: sd-lnk-in 220ms ease-out; }
@keyframes sd-lnk-in { from { opacity: 0; transform: translateY(4px); } }
.sd-lnk__c[data-size='compact'] { display: grid; grid-template-columns: 84px 1fr; }
.sd-lnk__img { aspect-ratio: 1.9; background: var(--soft); display: grid; place-items: center; overflow: hidden; }
.sd-lnk__c[data-size='compact'] .sd-lnk__img { aspect-ratio: auto; height: 100%; }
.sd-lnk__img svg { width: 100%; height: 100%; }
.sd-lnk__b { padding: 10px 12px; display: grid; gap: 3px; min-width: 0; }
.sd-lnk__b small { font-size: 11px; color: var(--mute); text-transform: lowercase; }
.sd-lnk__b a { color: var(--fg); font-size: 13.5px; font-weight: 700; text-decoration: none; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.sd-lnk__b a:hover { text-decoration: underline; }
.sd-lnk__b p { margin: 0; font-size: 12px; color: var(--mute); overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.sd-lnk__x { position: absolute; top: 6px; right: 6px; width: 26px; height: 26px; border-radius: 50%; background: var(--bg) !important; box-shadow: inset 0 0 0 1px var(--line); display: grid; place-items: center; font-size: 13px; }
.sd-lnk__sk { display: grid; gap: 8px; padding: 12px; border-radius: 14px; box-shadow: inset 0 0 0 1px var(--line); }
.sd-lnk__sk i { display: block; height: 10px; border-radius: 4px; background: var(--soft); animation: sd-lnk-p 1s ease-in-out infinite alternate; }
.sd-lnk__sk i:first-child { height: 90px; }
@keyframes sd-lnk-p { to { opacity: 0.45; } }
.sd-lnk__ed { display: grid; gap: 6px; }
.sd-lnk__ed input { height: 32px; padding: 0 10px; border: 0; border-radius: 8px; background: var(--soft); color: var(--fg); font: inherit; font-size: 12.5px; outline: 0; }
.sd-lnk__bar { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--mute); }
.sd-lnk__bar button { font-size: 12px; font-weight: 600; color: var(--fg) !important; text-decoration: underline; text-underline-offset: 2px; }
.sd-lnk__err { padding: 12px; border-radius: 12px; box-shadow: inset 0 0 0 1.5px var(--fg); font-size: 12.5px; }
@media (prefers-reduced-motion: reduce) { .sd-lnk *, .sd-lnk *::before, .sd-lnk *::after { animation: none !important; transition: none !important; } }