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hnefatafl/src/lib/components/Hall.svelte
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<script lang="ts">
// The hall: the landing page every game in the kit shares. Name, play the
// bot, open a table, join by code, the ledger of your tables, and the
// about panel with the rules, the guide and a way to reach the keeper.
import { goto } from '$app/navigation';
import { otherGames, type FamilyGame } from '$lib/family';
import Preferences from './Preferences.svelte';
import { prefs, setPref } from '$lib/prefs.svelte';
import { allSeats, doubtSeat, forgetSeat, rememberSeat, ServerError, trustSeat, type Report, type Tally } from '$lib/net/client';
import { api, NAME_MAX, playerName, rememberName, Room } from '$lib/net/room.svelte';
import { unreadTalk } from '$lib/net/talk';
import type { RoomView } from '$lib/net/view';
import type { State } from '$lib/game';
import { game } from '$lib/game';
let name = $state(playerName());
let code = $state('');
/** The host's choices for the next table, from the game's declared options. */
// A new table starts from the preferences' table defaults; the hall's selectors set the same keys.
const options = $derived<Record<string, string>>(
Object.fromEntries((game.options ?? []).map((o) => [o.key, o.choices.some((c) => c.value === prefs[`table.${o.key}`]) ? String(prefs[`table.${o.key}`]) : o.default]))
);
let prefsOpen = $state(false);
/** The hall's still of the opening position, on whichever board the selector names. */
const still = $derived(
options.set === 'tablut'
? { n: 9, wood: '#8d8577', line: 'rgba(40,34,28,0.5)', dark: '#3d3530', darkRim: '#1c1714', pale: '#cfc4ad', paleRim: '#8c8069', king: '#c9b27a', kingRim: '#7d6636', corners: false,
a: [[3,0],[4,0],[5,0],[4,1],[0,3],[8,3],[0,4],[1,4],[7,4],[8,4],[0,5],[8,5],[4,7],[3,8],[4,8],[5,8]], d: [[4,2],[4,3],[2,4],[3,4],[5,4],[6,4],[4,5],[4,6]] }
: { n: 11, wood: '#8a5a2b', line: 'rgba(30,16,6,0.5)', dark: '#2a2320', darkRim: '#0d0a08', pale: '#ece4d0', paleRim: '#b9ab8b', king: '#f0d58a', kingRim: '#a67c1a', corners: true,
a: [[3,0],[4,0],[5,0],[6,0],[7,0],[5,1],[0,3],[10,3],[0,4],[10,4],[0,5],[1,5],[9,5],[10,5],[0,6],[10,6],[0,7],[10,7],[5,9],[3,10],[4,10],[5,10],[6,10],[7,10]], d: [[5,3],[4,4],[5,4],[6,4],[3,5],[4,5],[6,5],[7,5],[4,6],[5,6],[6,6],[5,7]] }
);
const mid = $derived((still.n - 1) / 2);
let busy = $state(false);
let error = $state('');
let seats = $state(allSeats());
let games = $state<Record<string, RoomView<State> | null>>({});
let aboutOpen = $state(false);
/** The ledgers' tally, fetched when the about panel opens. */
let tally = $state<Tally | null>(null);
$effect(() => {
if (aboutOpen && !tally) api.tally().then((t) => (tally = t)).catch(() => (tally = null));
});
const hours = (minutes: number) => (minutes < 90 ? `${minutes} minutes` : `${Math.round(minutes / 60)} hours`);
/** The other games of the Kestrel's Nest, for the about panel. */
let family = $state<FamilyGame[]>([]);
$effect(() => {
void otherGames('hnefatafl').then((g) => (family = g));
});
/** Reports this browser's seats have filed, with the keeper's replies. */
let reports = $state<Report[]>([]);
let answers = $state<Record<string, string>>({});
let answerError = $state('');
const ready = $derived(name.trim().length > 0);
// Each held seat is looked up once, so the ledger can say whose move it
// is. A seat the server refuses outright is doubted; a second refusal in
// a row forgets it. Silence (a restart, a stale answer) forgets nothing.
$effect(() => {
for (const held of seats) {
if (held.roomId in games) continue;
games[held.roomId] = null;
api.view(held.roomId, held.token)
.then((v) => {
trustSeat(held.roomId);
games[held.roomId] = v;
})
.catch((e: unknown) => {
games[held.roomId] = null;
if (e instanceof ServerError && (e.status === 403 || e.status === 404) && doubtSeat(held.roomId)) seats = allSeats();
});
}
});
let phrase = $state('');
let claiming = $state(false);
/** Bring a seat from another device by the phrase it minted. */
async function claim(e: SubmitEvent) {
e.preventDefault();
claiming = true;
error = '';
try {
const got = await api.claim(phrase.trim());
rememberSeat(got.roomId, { seat: got.seat, token: got.token });
await goto(`/join/${got.roomId}`);
} catch (err) {
error = err instanceof Error ? err.message : 'The phrase opened no seat.';
} finally {
claiming = false;
}
}
// The desk is asked once per visit for every seat this browser holds.
$effect(() => {
const held = seats;
if (!held.length) return;
api.myReports(held.map((h) => ({ roomId: h.roomId, token: h.token })))
.then((r) => (reports = r.reports.sort((a, b) => (a.at < b.at ? 1 : -1))))
.catch(() => (reports = []));
});
async function open(make: () => Promise<Room>) {
busy = true;
error = '';
try {
rememberName(name);
const room = await make();
await goto(`/join/${room.roomId}`);
} catch (e) {
error = e instanceof Error ? e.message : 'The table could not be opened.';
} finally {
busy = false;
}
}
function join(e: SubmitEvent) {
e.preventDefault();
rememberName(name);
const c = code.trim().toUpperCase();
if (c) void goto(`/join/${c}`);
}
function forget(roomId: string) {
forgetSeat(roomId);
seats = allSeats();
}
function status(held: { roomId: string; seat: string }): string {
const g = games[held.roomId];
if (g === undefined) return 'looking';
if (g === null) return 'unreachable';
const others = g.seats.filter((s) => s.id !== held.seat).map((s) => (s.bot ? `${s.name} (a housecarl)` : s.name));
if (!g.state) return `waiting to start${g.seats.length ? ` · ${g.seats.map((s) => s.name).join(', ')}` : ''}`;
if (g.over) {
if (g.over.winner === held.seat) return 'you won';
if (g.over.winner === null) return 'a draw';
return `${game.nameOf(g.state, g.over.winner)} won`;
}
const round = `round ${g.turn}`;
if (g.waitingOn.includes(held.seat)) return `your move · ${round} · against ${others.join(', ')}`;
return `waiting on ${g.waitingOn.map((id) => game.nameOf(g.state!, id)).join(', ')} · ${round}`;
}
function unread(held: { roomId: string }): number {
const g = games[held.roomId];
return g ? unreadTalk(held.roomId, g.chat.length) : 0;
}
function yourMove(held: { roomId: string; seat: string }): boolean {
const g = games[held.roomId];
return !!g?.state && !g.over && g.waitingOn.includes(held.seat);
}
async function answer(r: Report) {
const text = (answers[r.id] ?? '').trim();
const held = seats.find((h) => h.roomId === r.roomId);
if (!text || !held) return;
answerError = '';
try {
await api.answerReport(r.id, r.roomId, held.token, text);
r.thread.push({ at: new Date().toISOString(), text, from: 'player' });
answers[r.id] = '';
} catch (e) {
answerError = e instanceof Error ? e.message : 'The answer did not reach the keeper.';
}
}
</script>
<section class="lid">
<div class="lid-head">
<h1>Hnefatafl</h1>
<p class="pitch">The Viking board game. One king, one throne, four corners, and a ring of attackers closing in.</p>
<p class="tag">Hnefatafl was played across the Norse world for a thousand years before chess. Every piece moves like a rook and is taken by being sandwiched; the attackers must capture the king, the king must reach safety. Play a housecarl, or open a table for a friend and play by turns. Copenhagen rules on the big board, or Tablut, the older game Linnaeus wrote down in 1732.</p>
<p class="links"><a href="/guide">how to play</a> · <a href="/rules">the rules</a> · <a class="about-link" href="#about" onclick={() => (aboutOpen = true)}>about this game a labor of love</a> · <button type="button" class="link-like" onclick={() => (prefsOpen = true)}>preferences</button></p>
<Preferences bind:open={prefsOpen} />
</div>
<div class="lid-play">
<label class="name">
<span>Your name</span>
<input type="text" bind:value={name} maxlength={NAME_MAX} placeholder="e.g. Morwenna" autocomplete="nickname" />
</label>
{#if game.options?.length}
<div class="options">
{#each game.options as o (o.key)}
{@const chosen = o.choices.find((c) => c.value === options[o.key])}
<div class="option-block">
<label class="option">
<span>{o.label}</span>
<select value={options[o.key]} onchange={(e) => setPref(`table.${o.key}`, e.currentTarget.value)}>
{#each o.choices as c (c.value)}<option value={c.value}>{c.label}</option>{/each}
</select>
</label>
{#if chosen?.note}<p class="option-note muted small">{chosen.note}</p>{/if}
</div>
{/each}
</div>
{/if}
<button type="button" class="commit primary" disabled={!ready || busy} onclick={() => open(() => Room.createWithBot(name.trim(), options))}>Play now against a housecarl</button>
<div class="ways">
<button type="button" class="quiet" disabled={!ready || busy} onclick={() => open(() => Room.create(name.trim(), game.seatIds.length, options))}>Open a table</button>
<form class="joinform" onsubmit={join}>
<span class="or">or join one</span>
<input type="text" class="code" bind:value={code} maxlength="4" placeholder="CODE" autocapitalize="characters" autocomplete="off" aria-label="room code" />
<button type="submit" class="quiet" disabled={!ready || code.trim().length < 4}>Join</button>
</form>
</div>
<p class="muted small">A code opens the door either way: take a seat if one is free, or watch from the Peanut Gallery.</p>
<form class="joinform claimform" onsubmit={claim}>
<span class="or">or bring a seat from another device</span>
<input type="text" bind:value={phrase} placeholder="the four-word phrase" autocomplete="off" aria-label="transfer phrase" />
<button type="submit" class="quiet" disabled={claiming || phrase.trim().split(/[\s-]+/).length < 4}>Claim</button>
</form>
{#if error}<p class="warning">{error}</p>{/if}
</div>
<div class="lid-look" aria-hidden="true">
<svg class="still" class:worn={options.set === 'tablut'} viewBox="0 0 {still.n * 10} {still.n * 10}" aria-hidden="true">
<rect x="0" y="0" width={still.n * 10} height={still.n * 10} rx="4" fill={still.wood} />
{#each Array.from({ length: still.n }, (_, r) => r) as r (r)}
{#each Array.from({ length: still.n }, (_, c) => c) as c (c)}
<rect x={c * 10} y={r * 10} width="10" height="10" fill={still.corners && (r === 0 || r === still.n - 1) && (c === 0 || c === still.n - 1) ? 'rgba(224,101,92,0.4)' : r === mid && c === mid ? 'rgba(240,165,58,0.4)' : 'rgba(255,240,210,0.08)'} stroke={still.line} stroke-width="0.4" />
{/each}
{/each}
{#each still.a as [x, y] (`${x},${y}`)}
<circle cx={x * 10 + 5} cy={y * 10 + 5} r="3.4" fill={still.dark} stroke={still.darkRim} stroke-width="0.6" />
{/each}
{#each still.d as [x, y] (`${x},${y}`)}
<circle cx={x * 10 + 5} cy={y * 10 + 5} r="3.4" fill={still.pale} stroke={still.paleRim} stroke-width="0.6" />
{/each}
<circle cx={mid * 10 + 5} cy={mid * 10 + 5} r="3.6" fill={still.king} stroke={still.kingRim} stroke-width="0.6" />
</svg>
</div>
{#if seats.length}
<div class="ledger">
<div class="ledger-head">your games</div>
{#each seats as held (held.roomId)}
<div class="ledger-row" class:your-move={yourMove(held)}>
<a class="ledger-resume" href={`/join/${held.roomId}`}>
<span class="ledger-code">{held.roomId}</span>
<span class="ledger-info">{status(held)}{#if unread(held) > 0} · <span class="talk-new">{unread(held)} new {unread(held) === 1 ? 'line' : 'lines'} of talk</span>{/if}</span>
</a>
<button type="button" class="ledger-forget" title="forget this game" onclick={() => forget(held.roomId)}>×</button>
</div>
{/each}
{#if reports.length}
<div class="ledger-head reports-head">your reports to the keeper</div>
{#each reports as r (r.id)}
{@const last = r.thread[r.thread.length - 1]}
<div class="report-row">
<span class="ledger-code">{r.roomId}</span>
<div class="report-body">
<p class="report-text">{r.happened}{#if r.image}<span class="muted" title="with your screenshot"> (with a picture)</span>{/if}</p>
{#each r.thread as line, j (j)}
{#if line.from === 'player'}
<p class="report-reply yours">you: {line.text}</p>
{:else}
<p class="report-reply"><span class="report-status">{line.status}</span> {line.text}</p>
{/if}
{/each}
{#if !last}
<p class="report-reply pending">the keeper is studying the moment</p>
{:else if last.from === 'player'}
<p class="report-reply pending">your word is with the keeper</p>
{/if}
{#if r.thread.some((l) => l.from === 'desk')}
<form class="report-answer" onsubmit={(e) => { e.preventDefault(); void answer(r); }}>
<input type="text" bind:value={answers[r.id]} maxlength="2000" placeholder="answer the keeper" aria-label="answer the keeper" />
<button type="submit" class="quiet" disabled={!(answers[r.id] ?? '').trim()}>Send</button>
</form>
{/if}
</div>
</div>
{/each}
{#if answerError}<p class="warning">{answerError}</p>{/if}
{/if}
</div>
{/if}
<details class="about" id="about" bind:open={aboutOpen}>
<summary>about this game</summary>
<div class="about-body">
<p>Hnefatafl is the tafl game of the Vikings, carried by them from Scandinavia to Britain, Ireland, Iceland and beyond, and played until chess arrived in the eleventh and twelfth centuries. No rules from that age survive; the game was reconstructed in modern times from a Sámi cousin, Tablut, whose rules the botanist Carl Linnaeus jotted down on his journey through Lapland in 1732.</p>
<p>This table plays Copenhagen, the modern tournament ruleset, on the eleven-by-eleven board, and Tablut on the nine-by-nine one, with the older board showing its age. The rules it follows are on the <a href="/rules">rules page</a>. The game is in the public domain; the board and pieces here are drawn, not borrowed.</p>
<p>It is free and keeps no accounts. A game between people lives on a small server as an append-only ledger of moves, so it can be replayed from its first move, and each player is shown only what the rules let them see.</p>
<h3>Send word</h3>
<p>A rule read wrong, a bug, a game you would like to tell of: write to <a href="mailto:eric@ericwagoner.com">eric@ericwagoner.com</a>, <a href="https://bsky.app/profile/kestrelsnest.social" target="_blank" rel="noreferrer">@kestrelsnest.social</a> on Bluesky, or <a href="https://toots.kestrelsnest.social/@eric" target="_blank" rel="noreferrer">@eric@toots.kestrelsnest.social</a> on Mastodon. The keeper of this hall roosts at <a href="https://kestrelsnest.social" target="_blank" rel="noreferrer">kestrelsnest.social</a>.</p>
{#if tally}
<h3>The tally</h3>
<dl class="tally">
<dt>{tally.gamesFinished}</dt><dd>{tally.gamesFinished === 1 ? 'game' : 'games'} played to a finish, of {tally.gamesBegun} begun at {tally.tablesOpened} {tally.tablesOpened === 1 ? 'table' : 'tables'}</dd>
<dt>{tally.namesSeated}</dt><dd>{tally.namesSeated === 1 ? 'name has' : 'names have'} taken a seat</dd>
<dt>{tally.turnsPlayed}</dt><dd>turns recorded; {tally.longestGameTurns} in the longest game</dd>
<dt>{hours(tally.minutesAtTable)}</dt><dd>at the table, by the clock between moves</dd>
<dt>{tally.gamesWithBot}</dt><dd>{tally.gamesWithBot === 1 ? 'game' : 'games'} with a housecarl seated; {tally.talkLines} {tally.talkLines === 1 ? 'line' : 'lines'} of table talk</dd>
{#each Object.entries(tally.byGame) as [label, n] (label)}
<dt>{n}</dt><dd>{label}</dd>
{/each}
</dl>
<p class="muted small">
{#if tally.firstGameAt}The first game began {new Date(tally.firstGameAt).toLocaleDateString(undefined, { year: 'numeric', month: 'long', day: 'numeric' })}.{/if}
Names are counted, not people: one player under two names is two here. Table time counts only the minutes between moves, so a game left open overnight adds nothing for the night.
</p>
{/if}
{#if family.length}
<h3>More games at the Kestrel's Nest</h3>
<ul class="family">
{#each family as g (g.slug)}
<li><a href={g.url}>{g.name}</a>: {g.pitch} <span class="muted">{g.players} players; {g.origin}.</span></li>
{/each}
</ul>
{/if}
<p class="made">Hnefatafl belongs to everyone; it is a thousand years old. This page was made by Eric and a very enthusiastic AI, 2026.</p>
</div>
</details>
</section>
<style>
.lid {
width: 100%;
max-width: 54rem;
background: var(--slate);
border: 1px solid var(--rule-strong);
border-radius: 8px;
padding: clamp(1.4rem, 3vw, 2.2rem) clamp(1.2rem, 3vw, 2.6rem) 1.8rem;
display: grid;
grid-template-columns: minmax(0, 1fr);
grid-template-areas: 'head' 'play' 'look' 'ledger' 'about';
gap: 1.2rem 2.2rem;
}
@media (min-width: 901px) {
.lid {
grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
grid-template-areas: 'head head' 'play look' 'ledger ledger' 'about about';
}
}
.lid-head {
grid-area: head;
text-align: center;
}
h1 {
font-size: clamp(2.6rem, 6vw, 3.6rem);
font-weight: 300;
letter-spacing: -0.01em;
}
.pitch {
font-style: italic;
font-size: 1.2rem;
margin-top: 0.3rem;
}
.tag {
color: var(--bone-dim);
max-width: 40em;
margin: 0.6rem auto 0.4rem;
font-size: 0.95rem;
}
.links {
font-size: 0.95rem;
color: var(--bone-faint);
}
.links a {
color: var(--frost);
}
.about-link {
font-style: italic;
text-decoration: underline dotted;
}
.lid-play {
grid-area: play;
display: flex;
flex-direction: column;
gap: 0.8rem;
}
.name {
display: block;
}
.name span {
display: block;
font-size: 0.8rem;
letter-spacing: 0.12em;
color: var(--bone-dim);
margin-bottom: 0.3rem;
}
.name input {
width: 100%;
}
.commit.primary {
width: 100%;
text-align: center;
}
.small {
font-size: 0.85rem;
}
.ways {
display: flex;
flex-wrap: wrap;
align-items: center;
gap: 0.6rem 1rem;
}
.joinform {
display: inline-flex;
align-items: center;
gap: 0.5rem;
}
.or {
color: var(--bone-dim);
font-style: italic;
font-size: 0.95rem;
}
.code {
width: 6.5em;
text-align: center;
text-transform: uppercase;
letter-spacing: 0.15em;
font-weight: 600;
}
.lid-look {
grid-area: look;
display: grid;
place-items: center;
min-height: 8rem;
background: var(--slate-deep);
border: 1px solid var(--rule-strong);
border-radius: 6px;
}
/* the games ledger */
.ledger {
grid-area: ledger;
border-top: 1px solid var(--rule-strong);
padding-top: 0.5rem;
}
.ledger-head {
font-style: italic;
color: var(--bone-dim);
margin-bottom: 0.3rem;
}
.ledger-row {
display: flex;
align-items: center;
gap: 0.4rem;
border-radius: 4px;
padding: 0.15rem 0.3rem;
}
.ledger-row.your-move {
background: rgba(240, 165, 58, 0.08);
}
.ledger-row.your-move .ledger-info {
color: var(--ember);
}
.ledger-resume {
flex: 1;
display: flex;
align-items: baseline;
gap: 0.9rem;
min-width: 0;
color: inherit;
text-decoration: none;
padding: 0.25rem 0;
}
.ledger-resume:hover .ledger-code {
color: var(--frost);
}
.ledger-code {
font-weight: 600;
letter-spacing: 0.12em;
flex-shrink: 0;
}
.ledger-info {
color: var(--bone-dim);
font-size: 0.95rem;
overflow-wrap: anywhere;
}
.talk-new {
color: var(--frost);
}
.ledger-forget {
background: none;
border: 0;
color: var(--bone-faint);
font-size: 1.1rem;
padding: 0 0.4rem;
}
.ledger-forget:hover {
color: var(--blood);
}
.reports-head {
margin-top: 0.9rem;
}
.report-row {
display: flex;
gap: 0.75rem;
align-items: flex-start;
padding: 0.45rem 0;
border-top: 1px solid var(--rule);
}
.report-body {
min-width: 0;
flex: 1;
}
.report-text {
font-size: 0.95rem;
}
.report-reply {
font-size: 0.85rem;
color: var(--bone-dim);
margin-top: 0.2rem;
}
.report-reply.yours {
font-style: italic;
}
.report-reply.pending {
font-style: italic;
color: var(--bone-faint);
}
.report-status {
color: var(--ember);
font-style: italic;
}
.report-answer {
display: flex;
gap: 0.4rem;
margin-top: 0.4rem;
}
.report-answer input {
flex: 1;
min-width: 0;
}
/* about */
.about {
grid-area: about;
border-top: 1px solid var(--rule-strong);
padding-top: 0.5rem;
}
.about summary {
cursor: pointer;
font-style: italic;
color: var(--bone-dim);
}
.about-body {
max-width: 44em;
color: var(--bone-dim);
padding: 0.6rem 0 0.2rem;
}
.about-body p + p {
margin-top: 0.6rem;
}
.about-body a {
color: var(--frost);
}
.about-body h3 {
font-size: 1rem;
font-style: italic;
margin: 0.9rem 0 0.2rem;
color: var(--bone);
}
.about-body .made {
font-size: 0.85rem;
color: var(--bone-faint);
}
.family {
margin: 0.4rem 0 0.8rem 1.2rem;
padding: 0;
}
.family li + li {
margin-top: 0.3rem;
}
.options {
display: flex;
flex-wrap: wrap;
gap: 0.5rem 1.2rem;
margin: 0.2rem 0 0.6rem;
}
.option {
display: flex;
align-items: center;
gap: 0.5rem;
font-size: 0.9rem;
}
.option-note {
margin: 0.2rem 0 0;
max-width: 22em;
}
.still {
width: 100%;
max-width: 18rem;
display: block;
margin: 0 auto;
border-radius: 4px;
transition: filter 0.9s ease;
}
.still.worn {
filter: contrast(0.85) sepia(0.15);
}
.tally {
display: grid;
grid-template-columns: max-content 1fr;
gap: 0.25rem 0.9rem;
margin: 0.4rem 0 0.6rem;
}
.tally dt {
text-align: right;
font-weight: 500;
}
.tally dd {
margin: 0;
}
.link-like {
background: none;
border: 0;
padding: 0;
font: inherit;
color: inherit;
text-decoration: underline;
cursor: pointer;
}
</style>