Ivan Fontosh
83 lines
2.7 KiB
TypeScript
83 lines
2.7 KiB
TypeScript
import { useEffect, useMemo, useRef, useState } from 'react';
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import { ipcChannels } from '../../../shared/ipc/contracts';
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import type { SceneTokensSessionEvent, SceneTokensSessionState } from '../../../shared/types';
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import { getDndApi } from '../dndApi';
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function applyEvent(
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prev: SceneTokensSessionState | null,
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event: SceneTokensSessionEvent,
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): SceneTokensSessionState {
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const base = prev ?? { revision: 0, byPlacementId: {} };
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if (event.kind === 'clear') {
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return { revision: base.revision + 1, byPlacementId: {} };
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}
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const placementId = String(event.placementId ?? '');
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if (!placementId) return base;
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const cur = base.byPlacementId[placementId];
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if (event.kind === 'setSize') {
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return {
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revision: base.revision + 1,
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byPlacementId: {
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...base.byPlacementId,
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[placementId]: {
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...(typeof cur?.nx === 'number' ? { nx: cur.nx } : {}),
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...(typeof cur?.ny === 'number' ? { ny: cur.ny } : {}),
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sizeN: event.sizeN,
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},
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},
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};
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}
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return {
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revision: base.revision + 1,
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byPlacementId: {
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...base.byPlacementId,
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[placementId]: {
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nx: event.nx,
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ny: event.ny,
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...(cur?.sizeN !== undefined ? { sizeN: cur.sizeN } : {}),
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},
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},
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};
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}
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export function useSceneTokensSession(): [
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SceneTokensSessionState | null,
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{ dispatch: (event: SceneTokensSessionEvent) => Promise<void> },
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] {
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const api = getDndApi();
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const [state, setState] = useState<SceneTokensSessionState | null>(null);
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const localRevisionRef = useRef(0);
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useEffect(() => {
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void api.invoke(ipcChannels.sceneTokensSession.getState, {}).then(({ state: s }) => {
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localRevisionRef.current = Math.max(localRevisionRef.current, s.revision);
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setState(s);
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});
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return api.on(ipcChannels.sceneTokensSession.stateChanged, ({ state: s }) => {
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// Не затираем более свежий optimistic-стейт устаревшим broadcast
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// (например, emit при смене сцены, пока последний move ещё в полёте).
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if (localRevisionRef.current > s.revision) return;
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localRevisionRef.current = s.revision;
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setState(s);
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});
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}, [api]);
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const apiWrap = useMemo(
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() => ({
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dispatch: async (event: SceneTokensSessionEvent) => {
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setState((prev) => {
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const next = applyEvent(prev, event);
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localRevisionRef.current = Math.max(localRevisionRef.current, next.revision);
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return next;
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});
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const res = await api.invoke(ipcChannels.sceneTokensSession.dispatch, { event });
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void res;
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},
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}),
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[api],
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);
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return [state, apiWrap];
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}
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