Iirolta saatu

src/AppContext.tsx

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+import { createContext, useContext, useEffect, useState, ReactNode } from 'react';
+import { db } from './database';
+import { useLiveQuery } from 'dexie-react-hooks';
+
+interface AppContextType {
+  language: string;
+  setLanguage: (lang: string) => void;
+  themeMode: string;
+  setThemeMode: (mode: string) => void;
+}
+
+const AppContext = createContext<AppContextType | undefined>(undefined);
+
+export function AppProvider({ children }: { children: ReactNode }) {
+  const settings = useLiveQuery(() => db.settings.toArray());
+  const [language, setLanguageState] = useState('fi');
+  const [themeMode, setThemeModeState] = useState('system');
+
+  useEffect(() => {
+    if (settings) {
+      const lang = settings.find(s => s.key === 'language')?.value;
+      const theme = settings.find(s => s.key === 'themeMode')?.value;
+      if (lang) setLanguageState(lang);
+      if (theme) setThemeModeState(theme);
+    }
+  }, [settings]);
+
+  const setLanguage = async (lang: string) => {
+    await db.settings.put({ key: 'language', value: lang });
+    setLanguageState(lang);
+  };
+
+  const setThemeMode = async (mode: string) => {
+    await db.settings.put({ key: 'themeMode', value: mode });
+    setThemeModeState(mode);
+  };
+
+  useEffect(() => {
+    const root = window.document.documentElement;
+    root.classList.remove('light', 'dark');
+
+    if (themeMode === 'system') {
+      const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
+      root.classList.add(systemTheme);
+    } else {
+      root.classList.add(themeMode);
+    }
+  }, [themeMode]);
+
+  return (
+    <AppContext.Provider value={{ language, setLanguage, themeMode, setThemeMode }}>
+      {children}
+    </AppContext.Provider>
+  );
+}
+
+export function useAppContext() {
+  const context = useContext(AppContext);
+  if (context === undefined) {
+    throw new Error('useAppContext must be used within an AppProvider');
+  }
+  return context;
+}