Resume chapter at specific page

- open from outside reader
 - is read
  - yes: 1st page
  - no : last read page
- inside reader via
 - chapter selection: first page
 - previous chapter : last page
 - next chapter     : first page

src/modules/reader/components/overlay/navigation/desktop/ReaderNavBarDesktopChapterNavigation.tsx

@@ -24,6 +24,7 @@ import { ReaderNavBarDesktopNextPreviousButton } from '@/modules/reader/componen
 import { useGetOptionForDirection } from '@/theme.tsx';
 import { ReaderService } from '@/modules/reader/services/ReaderService.ts';
 import { READING_DIRECTION_TO_THEME_DIRECTION } from '@/modules/reader/constants/ReaderSettings.constants.tsx';
+import { ReaderResumeMode } from '@/modules/reader/types/Reader.types.ts';
 
 export const ReaderNavBarDesktopChapterNavigation = ({
     currentChapter,
@@ -61,6 +62,7 @@ export const ReaderNavBarDesktopChapterNavigation = ({
                     direction,
                 )}
                 replace
+                state={{ resumeMode: getOptionForDirection(ReaderResumeMode.END, ReaderResumeMode.START) }}
             />
             <FormControl sx={{ flexBasis: '70%', flexGrow: 0, flexShrink: 0 }}>
                 <InputLabel id="reader-nav-bar-desktop-chapter-select">{t('chapter.title_one')}</InputLabel>
@@ -92,6 +94,7 @@ export const ReaderNavBarDesktopChapterNavigation = ({
                     direction,
                 )}
                 replace
+                state={{ resumeMode: getOptionForDirection(ReaderResumeMode.START, ReaderResumeMode.END) }}
             />
             <Popover
                 {...bindPopover(popupState)}

src/modules/reader/components/overlay/progress-bar/variants/MobileReaderProgressBar.tsx

@@ -20,7 +20,7 @@ import { useReaderStateChaptersContext } from '@/modules/reader/contexts/state/R
 import { ReaderService } from '@/modules/reader/services/ReaderService.ts';
 import { getPage } from '@/modules/reader/utils/ReaderProgressBar.utils.tsx';
 import { getOptionForDirection } from '@/theme.tsx';
-import { ProgressBarPosition } from '@/modules/reader/types/Reader.types.ts';
+import { ProgressBarPosition, ReaderResumeMode } from '@/modules/reader/types/Reader.types.ts';
 import { ReaderProgressBarDirectionWrapper } from '@/modules/reader/components/overlay/progress-bar/ReaderProgressBarDirectionWrapper.tsx';
 import { useReaderProgressBarContext } from '@/modules/reader/contexts/ReaderProgressBarContext.tsx';
 import { useReaderOverlayContext } from '@/modules/reader/contexts/ReaderOverlayContext.tsx';
@@ -34,8 +34,8 @@ export const MobileReaderProgressBar = () => {
 
     const direction = ReaderService.useGetThemeDirection();
 
-    const openNextChapter = ReaderService.useNavigateToChapter(nextChapter);
-    const openPreviousChapter = ReaderService.useNavigateToChapter(previousChapter);
+    const openNextChapter = ReaderService.useNavigateToChapter(nextChapter, ReaderResumeMode.START);
+    const openPreviousChapter = ReaderService.useNavigateToChapter(previousChapter, ReaderResumeMode.END);
 
     useLayoutEffect(() => {
         setIsMaximized(isVisible);

src/modules/reader/services/ReaderControls.ts

@@ -15,9 +15,10 @@ import { ReaderService } from '@/modules/reader/services/ReaderService.ts';
 import { useReaderStateChaptersContext } from '@/modules/reader/contexts/state/ReaderStateChaptersContext.tsx';
 import {
     PageInViewportType,
+    ReaderResumeMode,
+    ReaderTransitionPageMode,
     ReadingDirection,
     ReadingMode,
-    ReaderTransitionPageMode,
 } from '@/modules/reader/types/Reader.types.ts';
 import { ScrollDirection, ScrollOffset } from '@/modules/core/Core.types.ts';
 import { ReaderScrollAmount } from '@/modules/reader/constants/ReaderSettings.constants.tsx';
@@ -115,8 +116,8 @@ export class ReaderControls {
         const { previousChapter, nextChapter } = useReaderStateChaptersContext();
         const direction = READING_DIRECTION_TO_DIRECTION[readingDirection.value];
 
-        const openPreviousChapter = ReaderService.useNavigateToChapter(previousChapter);
-        const openNextChapter = ReaderService.useNavigateToChapter(nextChapter);
+        const openPreviousChapter = ReaderService.useNavigateToChapter(previousChapter, ReaderResumeMode.END);
+        const openNextChapter = ReaderService.useNavigateToChapter(nextChapter, ReaderResumeMode.START);
 
         return useCallback(
             (offset) => {

src/modules/reader/services/ReaderService.ts

@@ -17,6 +17,7 @@ import {
     IReaderSettingsWithDefaultFlag,
     ReaderExitMode,
     ReaderOverlayMode,
+    ReaderResumeMode,
     ReadingDirection,
 } from '@/modules/reader/types/Reader.types.ts';
 import { useReaderStateMangaContext } from '@/modules/reader/contexts/state/ReaderStateMangaContext.tsx';
@@ -44,9 +45,19 @@ const DIRECTION_TO_READING_DIRECTION: Record<Direction, ReadingDirection> = {
 };
 
 export class ReaderService {
-    static useNavigateToChapter(chapter?: TChapterReader): () => void {
+    static useNavigateToChapter(chapter?: TChapterReader, resumeMode?: ReaderResumeMode): () => void {
         const navigate = useNavigate();
-        return useCallback(() => chapter && navigate(Chapters.getReaderUrl(chapter), { replace: true }), [chapter]);
+        return useCallback(
+            () =>
+                chapter &&
+                navigate(Chapters.getReaderUrl(chapter), {
+                    replace: true,
+                    state: {
+                        resumeMode,
+                    },
+                }),
+            [chapter],
+        );
     }
 
     static useSettings(): IReaderSettingsWithDefaultFlag {

src/modules/reader/types/Reader.types.ts

@@ -214,3 +214,9 @@ export enum ReaderTransitionPageMode {
     NEXT,
     BOTH,
 }
+
+export enum ReaderResumeMode {
+    START,
+    END,
+    LAST_READ,
+}

src/modules/reader/utils/Reader.utils.ts

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { ReaderResumeMode } from '@/modules/reader/types/Reader.types.ts';
+
+export const getInitialReaderPageIndex = (
+    resumeMode: ReaderResumeMode,
+    lastReadPageIndex: number,
+    lastPageIndex: number,
+): number => {
+    if (resumeMode === ReaderResumeMode.START) {
+        return 0;
+    }
+
+    if (resumeMode === ReaderResumeMode.END) {
+        return lastPageIndex;
+    }
+
+    return Math.max(0, Math.min(lastPageIndex, lastReadPageIndex));
+};