Add preference

web/src/app/Prefs.js

@@ -1,5 +1,11 @@
 import db from "./db";
 
+export const UI_MODE = {
+  DARK: "dark",
+  LIGHT: "light",
+  SYSTEM: "system",
+};
+
 class Prefs {
   constructor(dbImpl) {
     this.db = dbImpl;
@@ -40,6 +46,15 @@ class Prefs {
   async setWebPushEnabled(enabled) {
     await this.db.prefs.put({ key: "webPushEnabled", value: enabled });
   }
+
+  async uiMode() {
+    const uiMode = await this.db.prefs.get("uiMode");
+    return uiMode?.value ?? UI_MODE.SYSTEM;
+  }
+
+  async setUIMode(mode) {
+    await this.db.prefs.put({ key: "uiMode", value: mode });
+  }
 }
 
 const prefs = new Prefs(db());

web/src/components/App.jsx

@@ -22,24 +22,41 @@ import Login from "./Login";
 import Signup from "./Signup";
 import Account from "./Account";
 import "../app/i18n"; // Translations!
+import prefs, { UI_MODE } from "../app/Prefs";
 
 export const AccountContext = createContext(null);
 
+const darkModeEnabled = (prefersDarkMode, uiModePreference) => {
+  switch (uiModePreference) {
+    case UI_MODE.DARK:
+      return true;
+
+    case UI_MODE.LIGHT:
+      return false;
+
+    case UI_MODE.SYSTEM:
+    default:
+      return prefersDarkMode;
+  }
+};
+
 const App = () => {
   const [account, setAccount] = useState(null);
   const accountMemo = useMemo(() => ({ account, setAccount }), [account, setAccount]);
 
   const prefersDarkMode = useMediaQuery("(prefers-color-scheme: dark)");
 
+  const uiModePreference = useLiveQuery(() => prefs.uiMode());
+
   const theme = React.useMemo(
     () =>
       createTheme({
         ...themeOptions,
         palette: {
-          ...(prefersDarkMode ? darkPalette : lightPalette),
+          ...(darkModeEnabled(prefersDarkMode, uiModePreference) ? darkPalette : lightPalette),
         },
       }),
-    [prefersDarkMode]
+    [prefersDarkMode, uiModePreference]
   );
 
   return (

web/src/components/Preferences.jsx

@@ -43,7 +43,7 @@ import accountApi, { Permission, Role } from "../app/AccountApi";
 import { Pref, PrefGroup } from "./Pref";
 import { AccountContext } from "./App";
 import { Paragraph } from "./styles";
-import prefs from "../app/Prefs";
+import prefs, { UI_MODE } from "../app/Prefs";
 import { PermissionDenyAll, PermissionRead, PermissionReadWrite, PermissionWrite } from "./ReserveIcons";
 import { ReserveAddDialog, ReserveDeleteDialog, ReserveEditDialog } from "./ReserveDialogs";
 import { UnauthorizedError } from "../app/errors";
@@ -86,6 +86,7 @@ const Notifications = () => {
         {t("prefs_notifications_title")}
       </Typography>
       <PrefGroup>
+        <UIMode />
         <Sound />
         <MinPriority />
         <DeleteAfter />
@@ -237,6 +238,27 @@ const DeleteAfter = () => {
   );
 };
 
+const UIMode = () => {
+  const { t } = useTranslation();
+  const labelId = "prefUIMode";
+  const enabled = useLiveQuery(async () => prefs.uiMode());
+  const handleChange = async (ev) => {
+    await prefs.setUIMode(ev.target.value);
+  };
+
+  return (
+    <Pref labelId={labelId} title={t("prefs_ui_mode_title")}>
+      <FormControl fullWidth variant="standard" sx={{ m: 1 }}>
+        <Select value={enabled ?? false} onChange={handleChange} aria-labelledby={labelId}>
+          <MenuItem value={UI_MODE.SYSTEM}>{t("prefs_ui_mode_system")}</MenuItem>
+          <MenuItem value={UI_MODE.DARK}>{t("prefs_ui_mode_dark")}</MenuItem>
+          <MenuItem value={UI_MODE.LIGHT}>{t("prefs_ui_mode_light")}</MenuItem>
+        </Select>
+      </FormControl>
+    </Pref>
+  );
+};
+
 const WebPushEnabled = () => {
   const { t } = useTranslation();
   const labelId = "prefWebPushEnabled";