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import { useMemo, useRef, useState } from "react";
import { enqueue, newClientKey, removeQueued, type PendingEntry, type QueueKey } from "./decisionQueue";
import { directSubmit } from "./directSubmit";
import { awaitAck, isInFlight, triggerFlush, useDecisionFlusher, type AckOutcome } from "./decisionFlusher";
import { triageDecisions, type TriageResult } from "./roundCopy";
// TONE register — a gentle stumble, never "error"/"failed".
export const STUMBLE_LINE = "That didn't go through — give it another try in a moment.";
type TriageDecision = { itemId: string; result: TriageResult };
interface RevisitState {
itemId: string;
label: string;
}
export interface OptimisticRound {
key: QueueKey;
stumble: boolean;
/** Persist-before-advance: resolves true once the answer is safe, false to stay put. */
submitDecision: (itemId: string, decision: TriageDecision) => Promise<boolean>;
revisit: RevisitState | null;
canGoBack: boolean;
/** The last answer's label for "Undo: …"; null when there is none. */
lastLabel: string | null;
/**
* Undo the last answer: a still-queued one is removed (`fresh` — show the piece
* as new); one already sent is re-presented (`revisit`). null when nothing moved.
*/
goBack: () => { itemId: string; label: string; fresh: boolean } | null;
clearRevisit: () => void;
}
const labelFor = (decision: TriageDecision) =>
triageDecisions(decision.itemId).find((t) => t.decision.result === decision.result)?.label ?? decision.result;
/**
* The feelings phase's answer engine: flusher wiring, persist-before-advance with
* the storage fallback, and Undo. A still-queued answer is removed outright; one
* already sent is re-presented with its choice selected, and the next tap
* supersedes it (the log is append-only, latest wins).
*/
export function useOptimisticRound({
curatorId,
sessionId,
collectionId,
}: {
curatorId: string;
sessionId: string;
/** ULID collection.id — the queue key (never the slug). */
collectionId: string;
}): OptimisticRound {
const key = useMemo<QueueKey>(() => ({ curatorId, sessionId, collectionId }), [curatorId, sessionId, collectionId]);
useDecisionFlusher(key);
const [answers, setAnswers] = useState<Array<{ clientKey: string; itemId: string; label: string }>>([]);
// Ack outcomes as they land, so Undo can tell a standing answer from a rejected one.
const outcomesRef = useRef(new Map<string, AckOutcome>());
const [revisit, setRevisit] = useState<RevisitState | null>(null);
const [stumble, setStumble] = useState(false);
const busyRef = useRef(false);
async function submitDecision(itemId: string, decision: TriageDecision): Promise<boolean> {
Iif (busyRef.current) return false;
busyRef.current = true;
try {
setStumble(false);
const clientKey = newClientKey();
const entry: PendingEntry = {
kind: "decision",
clientKey,
type: "triage",
decision,
enqueuedAt: new Date().toISOString(),
};
const persisted = await enqueue(key, entry, () => triggerFlush(key)); // quota → shrink the queue, retry once (F18)
if (persisted === "needs_fallback") {
if (!(await directSubmit({ sessionId, collectionId }, entry))) {
setStumble(true);
return false;
}
outcomesRef.current.set(clientKey, { status: "created" });
} else {
void awaitAck(key, clientKey).then((o) => outcomesRef.current.set(clientKey, o));
}
setAnswers((prev) => [...prev, { clientKey, itemId, label: labelFor(decision) }]);
setRevisit(null);
return true;
} finally {
busyRef.current = false;
}
}
function goBack(): { itemId: string; label: string; fresh: boolean } | null {
Iif (revisit !== null) return null;
const last = answers[answers.length - 1];
Iif (last === undefined) return null;
const outcome = outcomesRef.current.get(last.clientKey);
if (outcome?.status === "rejected") return null;
if (outcome === undefined && !isInFlight(key, last.clientKey) && removeQueued(key, last.clientKey)) {
setAnswers((prev) => prev.slice(0, -1));
return { itemId: last.itemId, label: last.label, fresh: true };
}
setRevisit({ itemId: last.itemId, label: last.label });
return { itemId: last.itemId, label: last.label, fresh: false };
}
const last = answers[answers.length - 1];
return {
key,
stumble,
submitDecision,
revisit,
canGoBack: revisit === null && last !== undefined,
lastLabel: last?.label ?? null,
goBack,
clearRevisit: () => setRevisit(null),
};
}
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