1 files changed, 69 insertions, 0 deletions
diff --git a/src/lib/manga.ts b/src/lib/manga.ts
new file mode 100644
index 00000000..5c73aced
--- /dev/null
+++ b/src/lib/manga.ts
@@ -0,0 +1,69 @@
+import { recentMediaActivities, type Media } from '$lib/AniList/media';
+import type { UserIdentity } from './AniList/identity';
+import { chapterDatabase } from './chapterDatabase';
+
+export const chapterCount = async (
+	identity: UserIdentity,
+	manga: Media,
+	preferActivity = false
+): Promise<number | null> => {
+	const chapters = await chapterDatabase.chapters.get(manga.id);
+
+	if (chapters !== undefined) {
+		return chapters.chapters === -1 ? null : chapters.chapters;
+	}
+
+	if (preferActivity) {
+		return await recentMediaActivities(identity, manga);
+	}
+
+	const tryRecentMediaActivities = async () => {
+		const anilistData = await recentMediaActivities(identity, manga);
+
+		await chapterDatabase.chapters.put({
+			id: manga.id,
+			chapters: anilistData ? anilistData : -1
+		});
+
+		return anilistData;
+	};
+
+	const mangadexData = await (
+		await fetch(
+			`/api/mangadex/manga?english=${manga.title.english}&year=${manga.startDate.year}&romaji=${manga.title.romaji}&native=${manga.title.native}`
+		)
+	).json();
+
+	if (mangadexData['data'] === undefined || mangadexData['data'].length === 0) {
+		return await tryRecentMediaActivities();
+	}
+
+	const lastChapterData = await (
+		await fetch(`/api/mangadex/feed?id=${mangadexData['data'][0]['id']}`)
+	).json();
+
+	if (lastChapterData['data'] === undefined || lastChapterData['data'].length === 0) {
+		return await tryRecentMediaActivities();
+	}
+
+	let lastChapter = lastChapterData['data'][0]['attributes']['chapter'];
+
+	if ((manga.mediaListEntry || { progress: 0 }).progress > lastChapter) {
+		const anilistData = await recentMediaActivities(identity, manga);
+
+		if (anilistData !== null && anilistData > lastChapter) {
+			lastChapter = anilistData;
+		}
+	}
+
+	if (lastChapter == 0) {
+		lastChapter = -1;
+	}
+
+	await chapterDatabase.chapters.put({
+		id: manga.id,
+		chapters: Number(lastChapter)
+	});
+
+	return Number(lastChapter);
+};