make default reader settings changeable (#217)

* [#214] Move "reader settings" util functions into new file

* [#214] Extract "options" of "ReaderSettings" to new component

* [#214] Add component for changing the default reader settings

* [#214] Add default "ReaderSettings" to "Settings"

* [#214] Use default "ReaderSettings" stored on the server

Wait for both "manga" and "defaultSettings" to be loaded.
Otherwise, by the time the "manga" response was received, the "defaultSettings" might be still loading and thus, the local fallback "default" settings will get used as the "default settings"

* [#214] Save and update "ReaderSettings" options in case they are missing

- Manga gets read the first time => save settings in metadata
- Default settings get opened the first time => save settings in global metadata

src/screens/Reader.tsx

@@ -15,12 +15,17 @@ import PageNumber from 'components/reader/PageNumber';
 import PagedPager from 'components/reader/pager/PagedPager';
 import DoublePagedPager from 'components/reader/pager/DoublePagedPager';
 import VerticalPager from 'components/reader/pager/VerticalPager';
-import ReaderNavBar, { getReaderSettingsFor } from 'components/navbar/ReaderNavBar';
+import ReaderNavBar from 'components/navbar/ReaderNavBar';
 import NavbarContext from 'components/context/NavbarContext';
 import client from 'util/client';
 import useLocalStorage from 'util/useLocalStorage';
 import { Box } from '@mui/system';
 import { requestUpdateMangaMetadata } from 'util/metadata';
+import {
+    checkAndHandleMissingStoredReaderSettings,
+    getReaderSettingsFor,
+    useDefaultReaderSettings,
+} from 'util/readerSettings';
 import makeToast from '../components/util/Toast';
 
 const getReaderComponent = (readerType: ReaderType) => {
@@ -68,13 +73,25 @@ export default function Reader() {
     const [curPage, setCurPage] = useState<number>(0);
     const { setOverride, setTitle } = useContext(NavbarContext);
 
-    const [settings, setSettings] = useState(getReaderSettingsFor(manga));
+    const {
+        settings: defaultSettings,
+        loading: areDefaultSettingsLoading,
+    } = useDefaultReaderSettings();
+    const [settings, setSettings] = useState(getReaderSettingsFor(manga, defaultSettings));
+    const [isMangaLoading, setIsMangaLoading] = useState(true);
 
     const setSettingValue = (key: keyof IReaderSettings, value: string | boolean) => {
         setSettings({ ...settings, [key]: value });
         requestUpdateMangaMetadata(manga, [[key, value]]).catch(() => makeToast('Failed to save the reader settings to the server', 'warning'));
     };
 
+    useEffect(() => {
+        if (!areDefaultSettingsLoading && !isMangaLoading) {
+            checkAndHandleMissingStoredReaderSettings(manga, 'manga', defaultSettings).catch(() => {});
+            setSettings(getReaderSettingsFor(manga, defaultSettings));
+        }
+    }, [areDefaultSettingsLoading, isMangaLoading]);
+
     useEffect(() => {
         // set the custom navbar
         setOverride(
@@ -97,13 +114,14 @@ export default function Reader() {
     }, [manga, chapter, settings, curPage, chapterIndex]);
 
     useEffect(() => {
+        setIsMangaLoading(true);
         setTitle('Reader');
         client.get(`/api/v1/manga/${mangaId}/`)
             .then((response) => response.data)
             .then((data: IManga) => {
                 setManga(data);
                 setTitle(data.title);
-                setSettings(getReaderSettingsFor(data));
+                setIsMangaLoading(false);
             });
     }, [mangaId]);