147 lines
8.3 KiB
TypeScript
147 lines
8.3 KiB
TypeScript
"use client";
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import { createContext, useCallback, useContext, useEffect, useId, useMemo, useRef, useState, type ReactNode } from "react";
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import { resolveLanguage, translator, type GeneralSettings, type Language, type Translator } from "@/src/core";
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import { notifySettingsSaved, useSettingsSaved } from "./settings-signal";
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import { MenuShell } from "./menu-shell";
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type I18nValue = {
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language: Language;
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sttLanguage: Language;
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general: GeneralSettings;
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dictating: boolean;
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setDictating: (active: boolean) => void;
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t: Translator;
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saveGeneral: (patch: Partial<GeneralSettings>) => Promise<void>;
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saveLanguage: (field: "language" | "sttLanguage", value: Language | undefined) => Promise<void>;
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};
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const I18nContext = createContext<I18nValue>({ language: "en", sttLanguage: "en", general: {}, dictating: false, setDictating: () => {}, t: translator("en"), saveGeneral: async () => {}, saveLanguage: async () => {} });
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export function useI18n(): I18nValue { return useContext(I18nContext); }
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/** Initial settings and locale come from the server, so hydration preserves the first frame. */
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export function I18nProvider({ children, initialGeneral = {}, system = "en" }: { children: ReactNode; initialGeneral?: GeneralSettings; system?: Language }) {
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const [general, setGeneral] = useState(initialGeneral);
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const [dictating, setDictating] = useState(false);
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const [detected, setDetected] = useState<Language>(system);
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const pending = useRef<Promise<void>>(Promise.resolve());
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const sequence = useRef(0);
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const latest = useRef(general);
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latest.current = general;
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const language = resolveLanguage(general.language, detected);
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const sttLanguage = resolveLanguage(general.sttLanguage, detected);
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const t = useMemo(() => translator(language), [language]);
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useEffect(() => {
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const detect = () => setDetected(resolveLanguage(undefined, navigator.languages));
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detect();
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window.addEventListener("languagechange", detect);
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return () => window.removeEventListener("languagechange", detect);
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}, []);
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useEffect(() => {
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document.documentElement.lang = language;
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document.title = "Learning Harness";
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const description = document.querySelector('meta[name="description"]');
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if (description) description.setAttribute("content", t("A teacher agent with a memory — sessions, quizzes, and a knowledge graph of what you know."));
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window.lh?.setLanguage?.(language);
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}, [language, t]);
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useSettingsSaved((section) => {
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if (section !== "general") return;
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const request = ++sequence.current;
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void fetch("/api/settings").then((r) => { if (!r.ok) throw new Error("settings"); return r.json(); })
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.then((body: { settings?: { general?: GeneralSettings } }) => { if (request === sequence.current) setGeneral(body.settings?.general ?? {}); }).catch(() => {});
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});
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// Serialize writes and re-read before replacing the section: simultaneous selectors cannot lose each other's changes.
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const saveGeneral = useCallback((patch: Partial<GeneralSettings>) => {
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const write = pending.current.catch(() => {}).then(async () => {
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const current = await fetch("/api/settings");
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if (!current.ok) throw new Error("Could not load language settings");
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const body = await current.json() as { settings?: { general?: GeneralSettings } };
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const next = { ...(body.settings?.general ?? latest.current) };
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for (const field of ["language", "sttLanguage", "autoUpdate"] as const) {
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if (!Object.hasOwn(patch, field)) continue;
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if (patch[field] === undefined) delete next[field];
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else Object.assign(next, { [field]: patch[field] });
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}
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const res = await fetch("/api/settings/general", { method: "PUT", headers: { "Content-Type": "application/json" }, body: JSON.stringify(next) });
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if (!res.ok) throw new Error("Could not save language settings");
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sequence.current++;
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setGeneral(next);
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notifySettingsSaved("general");
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});
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pending.current = write;
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return write;
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}, []);
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const saveLanguage = useCallback((field: "language" | "sttLanguage", value: Language | undefined) => saveGeneral({ [field]: value }), [saveGeneral]);
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const value = useMemo(() => ({ language, sttLanguage, general, dictating, setDictating, t, saveGeneral, saveLanguage }), [language, sttLanguage, general, dictating, t, saveGeneral, saveLanguage]);
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return <I18nContext.Provider value={value}>{children}</I18nContext.Provider>;
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}
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export function LanguageSelect({ field, disabled = false, compact = false }: { field: "language" | "sttLanguage"; disabled?: boolean; compact?: boolean }) {
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const { general, t, saveLanguage, sttLanguage, dictating } = useI18n();
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const [saving, setSaving] = useState(false);
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const [error, setError] = useState<string | null>(null);
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const [open, setOpen] = useState(false);
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const trigger = useRef<HTMLButtonElement>(null);
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const menuId = useId();
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const locked = disabled || saving || (field === "sttLanguage" && dictating);
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const menuOpen = open && !locked;
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const selected = general[field] ?? "auto";
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const label = t(field === "language" ? "Interface language" : "Speech recognition language");
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const testid = `language-select-${field}${compact ? "-compact" : ""}`;
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const options = [
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{ value: "auto", label: compact ? `${t("Auto")} · ${sttLanguage === "ru" ? "RU" : "EN"}` : t("System default") },
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{ value: "en", label: "English" },
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{ value: "ru", label: "Русский" },
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] as const;
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useEffect(() => { if (locked) setOpen(false); }, [locked]);
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useEffect(() => {
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if (!menuOpen) return;
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const outside = (event: PointerEvent) => {
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const target = event.target as Node;
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if (!trigger.current?.contains(target) && !document.getElementById(menuId)?.contains(target)) setOpen(false);
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};
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const escape = (event: KeyboardEvent) => {
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if (event.key !== "Escape") return;
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event.preventDefault();
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event.stopPropagation();
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setOpen(false);
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trigger.current?.focus();
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};
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document.addEventListener("pointerdown", outside);
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// Claim Escape before the settings dialog or dictation's outer layer.
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document.addEventListener("keydown", escape, true);
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return () => {
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document.removeEventListener("pointerdown", outside);
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document.removeEventListener("keydown", escape, true);
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};
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}, [menuOpen, menuId]);
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const pick = (value: "auto" | Language) => {
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if (locked) return;
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setOpen(false);
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trigger.current?.focus();
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if (value === selected) return;
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setSaving(true); setError(null);
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void saveLanguage(field, value === "auto" ? undefined : value).catch((e: unknown) => setError(e instanceof Error ? e.message : "Could not save language settings")).finally(() => setSaving(false));
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};
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return <span className={compact ? "flex shrink-0 items-center gap-1" : "flex flex-col items-end gap-1"}>
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<button ref={trigger} type="button" aria-label={label} title={label} aria-haspopup="menu" aria-expanded={menuOpen} aria-controls={menuOpen ? menuId : undefined} disabled={locked} data-testid={testid}
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className={`flex h-7 max-w-full items-center gap-1 rounded-sm border border-border bg-background px-1.5 font-ui text-xs text-foreground transition-colors hover:border-muted-foreground/50 disabled:cursor-not-allowed disabled:opacity-50 ${compact ? "w-24" : "w-36"}`}
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onClick={() => setOpen(!menuOpen)}
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onKeyDown={(event) => {
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if (event.key !== "ArrowDown" && event.key !== "ArrowUp") return;
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event.preventDefault(); event.stopPropagation(); setOpen(true);
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}}>
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<span className="min-w-0 flex-1 truncate text-left">{options.find((option) => option.value === selected)?.label}</span>
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<span aria-hidden className="text-muted-foreground">▾</span>
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</button>
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{menuOpen && <MenuShell anchorRef={trigger} testid={`${testid}-menu`} preferredSide={compact ? "up" : "down"} menuClass="flex w-44 flex-col gap-0.5 rounded-xl border border-border bg-card p-2 text-xs shadow-xl">
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<div id={menuId} role="menu" aria-label={label} className="flex flex-col gap-0.5">
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{options.map((option) => <button key={option.value} type="button" role="menuitemradio" aria-checked={selected === option.value} onClick={() => pick(option.value)}
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className={`flex items-center justify-between rounded-lg px-2 py-1.5 text-left transition-colors hover:bg-muted ${selected === option.value ? "bg-muted/60 text-card-foreground" : "text-card-foreground"}`}>
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<span>{option.label}</span>{selected === option.value && <span aria-hidden>✓</span>}
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</button>)}
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</div>
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</MenuShell>}
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{error && <span role="alert" className="max-w-56 text-xs text-destructive">{t(error)}</span>}
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</span>;
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}
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