/** * Unified settings hook. * * Abstracts the split between server-authoritative settings (persisted in * `settings.json` on the server, fetched via `server.getConfig`) and * client-only settings (persisted in localStorage). * * Consumers use `useSettings(selector)` to read, and `useUpdateSettings()` to * write. The hook transparently routes reads/writes to the correct backing * store. */import { useCallback, useMemo, useSyncExternalStore } from "react";import { ServerSettings, ServerSettingsPatch } from "@t3tools/contracts";import { type ClientSettings, DEFAULT_CLIENT_SETTINGS, DEFAULT_UNIFIED_SETTINGS, UnifiedSettings,} from "@t3tools/contracts/settings";import { ensureLocalApi } from "~/localApi";import { Struct } from "effect";import { deepMerge } from "@t3tools/shared/Struct";import { applySettingsUpdated, getServerConfig, useServerSettings } from "~/rpc/serverState"; const CLIENT_SETTINGS_PERSISTENCE_ERROR_SCOPE = "[CLIENT_SETTINGS]"; const clientSettingsListeners = new Set<() => void>();let clientSettingsSnapshot = DEFAULT_CLIENT_SETTINGS;let clientSettingsHydrated = false;let clientSettingsHydrationPromise: Promise<void> | null = null; function emitClientSettingsChange() { for (const listener of clientSettingsListeners) { listener(); }} function getClientSettingsSnapshot(): ClientSettings { return clientSettingsSnapshot;} function replaceClientSettingsSnapshot(settings: ClientSettings): void { clientSettingsSnapshot = settings; emitClientSettingsChange();} function subscribeClientSettings(listener: () => void): () => void { clientSettingsListeners.add(listener); void hydrateClientSettings(); return () => { clientSettingsListeners.delete(listener); };} async function hydrateClientSettings(): Promise<void> { if (clientSettingsHydrated) { return; } if (clientSettingsHydrationPromise) { return clientSettingsHydrationPromise; } const nextHydration = (async () => { try { const persistedSettings = await ensureLocalApi().persistence.getClientSettings(); if (persistedSettings) { replaceClientSettingsSnapshot(persistedSettings); } } catch (error) { console.error(`${CLIENT_SETTINGS_PERSISTENCE_ERROR_SCOPE} hydrate failed`, error); } finally { clientSettingsHydrated = true; } })(); const hydrationPromise = nextHydration.finally(() => { if (clientSettingsHydrationPromise === hydrationPromise) { clientSettingsHydrationPromise = null; } }); clientSettingsHydrationPromise = hydrationPromise; return clientSettingsHydrationPromise;} function persistClientSettings(settings: ClientSettings): void { replaceClientSettingsSnapshot(settings); void ensureLocalApi() .persistence.setClientSettings(settings) .catch((error) => { console.error(`${CLIENT_SETTINGS_PERSISTENCE_ERROR_SCOPE} persist failed`, error); });} // ── Key sets for routing patches ───────────────────────────────────── const SERVER_SETTINGS_KEYS = new Set<string>(Struct.keys(ServerSettings.fields)); function splitPatch(patch: Partial<UnifiedSettings>): { serverPatch: ServerSettingsPatch; clientPatch: Partial<ClientSettings>;} { const serverPatch: Record<string, unknown> = {}; const clientPatch: Record<string, unknown> = {}; for (const [key, value] of Object.entries(patch)) { if (SERVER_SETTINGS_KEYS.has(key)) { serverPatch[key] = value; } else { clientPatch[key] = value; } } return { serverPatch: serverPatch as ServerSettingsPatch, clientPatch: clientPatch as Partial<ClientSettings>, };} // ── Hooks ──────────────────────────────────────────────────────────── /** * Read merged settings. Selector narrows the subscription so components * only re-render when the slice they care about changes. */ export function useSettings<T = UnifiedSettings>(selector?: (s: UnifiedSettings) => T): T { const serverSettings = useServerSettings(); const clientSettings = useSyncExternalStore( subscribeClientSettings, getClientSettingsSnapshot, () => DEFAULT_CLIENT_SETTINGS, ); const merged = useMemo<UnifiedSettings>( () => ({ ...serverSettings, ...clientSettings, }), [clientSettings, serverSettings], ); return useMemo(() => (selector ? selector(merged) : (merged as T)), [merged, selector]);} /** * Returns an updater that routes each key to the correct backing store. * * Server keys are optimistically patched in atom-backed server state, then * persisted via RPC. Client keys go through client persistence. */export function useUpdateSettings() { const updateSettings = useCallback((patch: Partial<UnifiedSettings>) => { const { serverPatch, clientPatch } = splitPatch(patch); if (Object.keys(serverPatch).length > 0) { const currentServerConfig = getServerConfig(); if (currentServerConfig) { applySettingsUpdated(deepMerge(currentServerConfig.settings, serverPatch)); } // Fire-and-forget RPC — push will reconcile on success void ensureLocalApi().server.updateSettings(serverPatch); } if (Object.keys(clientPatch).length > 0) { persistClientSettings({ ...getClientSettingsSnapshot(), ...clientPatch, }); } }, []); const resetSettings = useCallback(() => { updateSettings(DEFAULT_UNIFIED_SETTINGS); }, [updateSettings]); return { updateSettings, resetSettings, };} export function __resetClientSettingsPersistenceForTests(): void { clientSettingsSnapshot = DEFAULT_CLIENT_SETTINGS; clientSettingsHydrated = false; clientSettingsHydrationPromise = null; clientSettingsListeners.clear();}
/**
* Unified settings hook.
*
* Abstracts the split between server-authoritative settings (persisted in
* `settings.json` on the server, fetched via `server.getConfig`) and
* client-only settings (persisted in localStorage).
*
* Consumers use `useSettings(selector)` to read, and `useUpdateSettings()` to
* write. The hook transparently routes reads/writes to the correct backing
* store.
*/
import { useCallback, useMemo, useSyncExternalStore } from "react";
import { ServerSettings, ServerSettingsPatch } from "@t3tools/contracts";
import {
type ClientSettings,
DEFAULT_CLIENT_SETTINGS,
DEFAULT_UNIFIED_SETTINGS,
UnifiedSettings,
} from "@t3tools/contracts/settings";
import { ensureLocalApi } from "~/localApi";
import { Struct } from "effect";
import { deepMerge } from "@t3tools/shared/Struct";
import { applySettingsUpdated, getServerConfig, useServerSettings } from "~/rpc/serverState";
const CLIENT_SETTINGS_PERSISTENCE_ERROR_SCOPE = "[CLIENT_SETTINGS]";
const clientSettingsListeners = new Set<() => void>();
let clientSettingsSnapshot = DEFAULT_CLIENT_SETTINGS;
let clientSettingsHydrated = false;
let clientSettingsHydrationPromise: Promise<void> | null = null;
function emitClientSettingsChange() {
for (const listener of clientSettingsListeners) {
listener();
}
}
function getClientSettingsSnapshot(): ClientSettings {
return clientSettingsSnapshot;
}
function replaceClientSettingsSnapshot(settings: ClientSettings): void {
clientSettingsSnapshot = settings;
emitClientSettingsChange();
}
function subscribeClientSettings(listener: () => void): () => void {
clientSettingsListeners.add(listener);
void hydrateClientSettings();
return () => {
clientSettingsListeners.delete(listener);
};
}
async function hydrateClientSettings(): Promise<void> {
if (clientSettingsHydrated) {
return;
}
if (clientSettingsHydrationPromise) {
return clientSettingsHydrationPromise;
}
const nextHydration = (async () => {
try {
const persistedSettings = await ensureLocalApi().persistence.getClientSettings();
if (persistedSettings) {
replaceClientSettingsSnapshot(persistedSettings);
}
} catch (error) {
console.error(`${CLIENT_SETTINGS_PERSISTENCE_ERROR_SCOPE} hydrate failed`, error);
} finally {
clientSettingsHydrated = true;
}
})();
const hydrationPromise = nextHydration.finally(() => {
if (clientSettingsHydrationPromise === hydrationPromise) {
clientSettingsHydrationPromise = null;
}
});
clientSettingsHydrationPromise = hydrationPromise;
return clientSettingsHydrationPromise;
}
function persistClientSettings(settings: ClientSettings): void {
replaceClientSettingsSnapshot(settings);
void ensureLocalApi()
.persistence.setClientSettings(settings)
.catch((error) => {
console.error(`${CLIENT_SETTINGS_PERSISTENCE_ERROR_SCOPE} persist failed`, error);
});
}
// ── Key sets for routing patches ─────────────────────────────────────
const SERVER_SETTINGS_KEYS = new Set<string>(Struct.keys(ServerSettings.fields));
function splitPatch(patch: Partial<UnifiedSettings>): {
serverPatch: ServerSettingsPatch;
clientPatch: Partial<ClientSettings>;
} {
const serverPatch: Record<string, unknown> = {};
const clientPatch: Record<string, unknown> = {};
for (const [key, value] of Object.entries(patch)) {
if (SERVER_SETTINGS_KEYS.has(key)) {
serverPatch[key] = value;
} else {
clientPatch[key] = value;
}
}
return {
serverPatch: serverPatch as ServerSettingsPatch,
clientPatch: clientPatch as Partial<ClientSettings>,
};
}
// ── Hooks ────────────────────────────────────────────────────────────
/**
* Read merged settings. Selector narrows the subscription so components
* only re-render when the slice they care about changes.
*/
export function useSettings<T = UnifiedSettings>(selector?: (s: UnifiedSettings) => T): T {
const serverSettings = useServerSettings();
const clientSettings = useSyncExternalStore(
subscribeClientSettings,
getClientSettingsSnapshot,
() => DEFAULT_CLIENT_SETTINGS,
);
const merged = useMemo<UnifiedSettings>(
() => ({
...serverSettings,
...clientSettings,
}),
[clientSettings, serverSettings],
);
return useMemo(() => (selector ? selector(merged) : (merged as T)), [merged, selector]);
}
/**
* Returns an updater that routes each key to the correct backing store.
*
* Server keys are optimistically patched in atom-backed server state, then
* persisted via RPC. Client keys go through client persistence.
*/
export function useUpdateSettings() {
const updateSettings = useCallback((patch: Partial<UnifiedSettings>) => {
const { serverPatch, clientPatch } = splitPatch(patch);
if (Object.keys(serverPatch).length > 0) {
const currentServerConfig = getServerConfig();
if (currentServerConfig) {
applySettingsUpdated(deepMerge(currentServerConfig.settings, serverPatch));
}
// Fire-and-forget RPC — push will reconcile on success
void ensureLocalApi().server.updateSettings(serverPatch);
}
if (Object.keys(clientPatch).length > 0) {
persistClientSettings({
...getClientSettingsSnapshot(),
...clientPatch,
});
}
}, []);
const resetSettings = useCallback(() => {
updateSettings(DEFAULT_UNIFIED_SETTINGS);
}, [updateSettings]);
return {
updateSettings,
resetSettings,
};
}
export function __resetClientSettingsPersistenceForTests(): void {
clientSettingsSnapshot = DEFAULT_CLIENT_SETTINGS;
clientSettingsHydrated = false;
clientSettingsHydrationPromise = null;
clientSettingsListeners.clear();
}