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import { useRef, useState, useSyncExternalStore } from "react";
import { useRouter } from "next/navigation";
import type { Item } from "@/types";
import { itemDisplayName, itemInitial } from "@/lib/items";
import { Button, CardImage } from "@/components/ui";
import { enqueue, newClientKey, readQueue, type PendingEntry, type QueueKey } from "./decisionQueue";
import { directSubmit } from "./directSubmit";
import { awaitAck, getNoticeSet, isInFlight, subscribeNoticeSet, triggerFlush, type AckOutcome } from "./decisionFlusher";
type Result = "item_a" | "item_b" | "tie" | "skip";
type CompareSubmit =
| { kind: "session"; sessionId: string; curatorId: string; collectionId: string }
| { kind: "local"; onDecision: (result: Result) => void };
// The pairs screen does NOT wait out the flusher's 60 s backoff cap: after this
// bound it shows the gentle retry line while the queue keeps the entry.
export const COMPARE_ACK_BOUND_MS = 5_000;
export const COMPARE_SLOW_SAVE_LINE = "Still saving that one — it's safe, and it's on its way.";
const FALLBACK_RETRY_LINE = "That didn't save. Try again.";
interface Pair {
itemA: Item;
itemB: Item;
heroA?: string;
heroB?: string;
}
interface Answered extends Pair {
result: Result;
}
/** The person's word for a pair answer, as Undo shows it (spec §4). */
function answerLabel({ itemA, itemB, result }: Answered): string {
if (result === "tie") return "Tie";
if (result === "skip") return "Skip";
return itemDisplayName(result === "item_a" ? itemA : itemB);
}
interface CompareChoiceProps extends Pair {
submit: CompareSubmit;
}
export function CompareChoice({ submit, itemA, itemB, heroA, heroB }: CompareChoiceProps) {
const router = useRouter();
const [pending, setPending] = useState<string | null>(null);
// The tap guard. Controls stay enabled while an answer saves (aria-disabled):
// disabling the focused card would drop focus to <body> on every answer.
const pendingRef = useRef(false);
// A sort closed elsewhere (409): the answer will never land here, so the
// "it's safe" line must not stand and the controls hold still; PendingNotices
// says what happened. Only THIS sort's conflict: a sticky one from an earlier
// sort in the same tab (or any, for the local walkthrough) never holds this one.
const sessionId = submit.kind === "session" ? submit.sessionId : undefined;
const notices = useSyncExternalStore(subscribeNoticeSet, getNoticeSet, getNoticeSet);
const closedElsewhere =
sessionId !== undefined && notices.some((n) => n.kind === "session_conflict" && n.sessionId === sessionId);
// Derived, not reset in an effect: both tap guards and `busy` already hold on closedElsewhere, and
// the ack bound releases the tap guard; only the "Saving…" label must let go here.
// Relies on a session_conflict never being dismissed in-tab (it offers Reload only).
const saving = closedElsewhere ? null : pending;
const [error, setError] = useState<string | null>(null);
// One idempotency key per in-flight tap, reused if that same tap is retried so the
// server dedupes the retry; cleared on ack. The slot names the PAIR as well as the
// choice: Undo changes the shown pair without an ack, so a choice-only slot could
// hand an unacked key from one pair to another and the server would drop the answer.
const clientKeys = useRef<Record<string, string>>({});
// Mounted empty so the region exists before its text changes (SC 4.1.3).
const [announcement, setAnnouncement] = useState("");
const settled = useRef(new Set<string>());
// Undo (spec §4): the last settled answer, and the pair being revisited.
const [last, setLast] = useState<Answered | null>(null);
const [revisit, setRevisit] = useState<Answered | null>(null);
const shown: Pair = revisit ?? { itemA, itemB, heroA, heroB };
const mode = revisit ? "revisit" : "pair";
function settle(clientKey: string, keySlot: string, answered: Answered, outcome?: AckOutcome) {
Iif (settled.current.has(clientKey)) return;
settled.current.add(clientKey);
delete clientKeys.current[keySlot];
setError(null);
pendingRef.current = false;
// A rejected answer never stood: advance, but offer no Undo and claim no choice.
if (outcome?.status === "rejected") {
setLast(null);
setRevisit(null);
setPending(null);
router.refresh();
return;
}
const a = itemDisplayName(answered.itemA);
const b = itemDisplayName(answered.itemB);
setAnnouncement(
answered.result === "tie"
? `${a} and ${b} — loved just the same.`
: answered.result === "skip"
? `${a} and ${b} — skipped for now.`
: `You love ${answered.result === "item_a" ? a : b} more than ${answered.result === "item_a" ? b : a}.`,
);
setLast(answered);
setRevisit(null);
// Clear pending BEFORE refresh: the refresh re-renders THIS instance with the next pair.
setPending(null);
router.refresh();
}
// The pair changes under the person's focus, so say which pair is in front of them.
function undo(answered: Answered) {
setRevisit(answered);
setAnnouncement(
`Back to ${itemDisplayName(answered.itemA)} and ${itemDisplayName(answered.itemB)}. You chose ${answerLabel(answered)} — change it?`,
);
}
function keepGoing() {
setRevisit(null);
setAnnouncement(`Back to ${itemDisplayName(itemA)} and ${itemDisplayName(itemB)}.`);
}
async function choose(result: Result, tapped: string) {
if (submit.kind === "local") {
submit.onDecision(result); // walkthrough: no keys, no pending, no refresh
return;
}
if (pendingRef.current || closedElsewhere) return; // closed elsewhere: nothing more can land
pendingRef.current = true;
const pair = shown;
const slot = `${mode}:${tapped}`;
const keySlot = `${pair.itemA.id}:${pair.itemB.id}:${tapped}`;
setPending(slot);
setError(null);
const key: QueueKey = { curatorId: submit.curatorId, sessionId: submit.sessionId, collectionId: submit.collectionId };
const clientKey = (clientKeys.current[keySlot] ??= newClientKey());
const decision = { itemAId: pair.itemA.id, itemBId: pair.itemB.id, result };
// NEVER a bare fetch: the answer rides the queue as a batch-of-1.
const alreadyRiding = readQueue(key).some((e) => e.clientKey === clientKey) || isInFlight(key, clientKey);
if (!alreadyRiding && !settled.current.has(clientKey)) {
const entry: PendingEntry = {
kind: "decision",
clientKey,
type: "pairwise_compare",
decision,
enqueuedAt: new Date().toISOString(),
};
const persisted = await enqueue(key, entry, () => triggerFlush(key));
if (persisted === "needs_fallback") {
Iif (!(await directSubmit({ sessionId: submit.sessionId, collectionId: submit.collectionId }, entry))) {
setError(FALLBACK_RETRY_LINE);
pendingRef.current = false;
setPending(null);
return;
}
settle(clientKey, keySlot, { ...pair, result });
return;
}
}
const ack = awaitAck(key, clientKey);
void triggerFlush(key);
const outcome = await Promise.race([
ack,
new Promise<"slow">((resolve) => {
setTimeout(() => resolve("slow"), COMPARE_ACK_BOUND_MS);
}),
]);
if (outcome === "slow") {
pendingRef.current = false;
setPending(null);
setError(COMPARE_SLOW_SAVE_LINE);
void ack.then((late) => settle(clientKey, keySlot, { ...pair, result }, late));
return;
}
settle(clientKey, keySlot, { ...pair, result }, outcome);
}
const busy = pending !== null || closedElsewhere || undefined;
const prior = revisit?.result;
const pressed = (result: Result) => (prior === undefined ? undefined : prior === result);
const ring = (result: Result) => (prior === result ? " ring-2 ring-primary ring-offset-2 ring-offset-ground" : "");
const held = " aria-disabled:cursor-not-allowed aria-disabled:opacity-60";
const choices = [
{ item: shown.itemA, hero: shown.heroA, result: "item_a" as const, key: "a" },
{ item: shown.itemB, hero: shown.heroB, result: "item_b" as const, key: "b" },
];
return (
<div className="space-y-6">
<p role="status" aria-live="polite" className="sr-only">
{announcement}
</p>
{revisit && <p className="text-sm text-ink-soft">You chose {answerLabel(revisit)} — change it?</p>}
{/* Tapping a card IS the choice (tap-first). Always two-up. */}
<div className="grid grid-cols-1 gap-4 min-[420px]:grid-cols-2">
{choices.map(({ item, hero, result, key }) => (
<button
key={key}
type="button"
aria-disabled={busy}
aria-label={`Choose ${itemDisplayName(item)}`}
aria-pressed={pressed(result)}
onClick={() => choose(result, key)}
className={`group flex min-h-11 flex-col overflow-hidden rounded-card border border-rim bg-glass text-left transition-shadow duration-200 ease-gentle hover:shadow-lift focus:outline-hidden focus-visible:ring-2 focus-visible:ring-primary focus-visible:ring-offset-2 focus-visible:ring-offset-ground${held}${ring(result)}`}
>
<div className="relative flex aspect-4/3 items-center justify-center overflow-hidden bg-content-soft">
<CardImage
src={hero}
alt={itemDisplayName(item)}
fallback={
<span className="font-display text-6xl text-ink-soft" aria-hidden>
{itemInitial(item)}
</span>
}
/>
</div>
<div className="p-4">
<h3 className="text-ink">{saving === `${mode}:${key}` ? "Saving…" : itemDisplayName(item)}</h3>
{item.brand && <p className="mt-1 text-sm text-ink-soft">{item.brand}</p>}
</div>
</button>
))}
</div>
{/* Escape hatches, deliberately quiet. */}
<div className="flex items-center justify-center gap-2">
<Button type="button" variant="ghost" size="sm" className={`min-h-11${held}${ring("tie")}`} aria-disabled={busy} aria-pressed={pressed("tie")} onClick={() => choose("tie", "tie")}>
{saving === `${mode}:tie` ? "Saving…" : "Tie"}
</Button>
<span className="text-hairline" aria-hidden>
·
</span>
<Button type="button" variant="ghost" size="sm" className={`min-h-11${held}${ring("skip")}`} aria-disabled={busy} aria-pressed={pressed("skip")} onClick={() => choose("skip", "skip")}>
{saving === `${mode}:skip` ? "Saving…" : "Skip"}
</Button>
</div>
{/* One button that swaps Undo ↔ Keep going, so focus stays put (SC 2.4.3). */}
{submit.kind === "session" && last && (
<div className="flex justify-center">
<button
type="button"
aria-disabled={busy}
onClick={() => {
if (pendingRef.current || closedElsewhere) return;
if (revisit) keepGoing();
else undo(last);
}}
className={`inline-flex h-11 items-center rounded-control px-2 text-sm text-ink-soft transition-colors hover:text-ink focus:outline-hidden focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:ring-offset-ground focus-visible:ring-primary${held}`}
>
{revisit ? "Keep going" : `Undo: ${answerLabel(last)}`}
</button>
</div>
)}
{error && !closedElsewhere && <p className="text-center text-sm text-ink-soft">{error}</p>}
</div>
);
}
|