Extract "reader chapters store slice" into file

src/features/reader/stores/ReaderChaptersStore.ts

@@ -0,0 +1,59 @@
+/*
+ * 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 { ImmerStateCreator } from '@/lib/zustand/Zustand.types.ts';
+import { ReaderStateChapters } from '@/features/reader/Reader.types.ts';
+
+export interface ReaderChaptersStoreSlice {
+    chapters: ReaderStateChapters & {
+        reset: () => void;
+    };
+}
+
+export const READER_DEFAULT_CHAPTERS_STATE = {
+    chapters: {
+        chapters: [],
+        isCurrentChapterReady: false,
+        visibleChapters: {
+            leading: 0,
+            trailing: 0,
+            lastLeadingChapterSourceOrder: 99999,
+            lastTrailingChapterSourceOrder: -1,
+            isLeadingChapterPreloadMode: true,
+            isTrailingChapterPreloadMode: true,
+            scrollIntoView: false,
+            resumeMode: undefined,
+        },
+    },
+} satisfies {
+    chapters: Omit<ReaderStateChapters, 'setReaderStateChapters'>;
+};
+
+export const createReaderChaptersStoreSlice = <T extends ReaderChaptersStoreSlice>(
+    ...[set, get]: Parameters<ImmerStateCreator<T>>
+): ReaderChaptersStoreSlice => ({
+    chapters: {
+        ...READER_DEFAULT_CHAPTERS_STATE.chapters,
+        reset: () => set(() => ({ chapters: { ...get().chapters, ...READER_DEFAULT_CHAPTERS_STATE.chapters } })),
+        setReaderStateChapters: (state) =>
+            set((draft) => {
+                if (typeof state === 'function') {
+                    draft.chapters = {
+                        ...get().chapters,
+                        ...state(get().chapters),
+                    };
+                    return;
+                }
+
+                draft.chapters = {
+                    ...get().chapters,
+                    ...state,
+                };
+            }),
+    },
+});