src/lib/mangadex.ts


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import type { Media } from '$lib/AniList/media';
import { chapterDatabase } from './chapterDatabase';

export const chapterCount = async (manga: Media): Promise<number | null> => {
	const chapters = await chapterDatabase.chapters.get(manga.id);

	if (chapters !== undefined) {
		return chapters.chapters === -1 ? null : chapters.chapters;
	}

	const mangadexData = await (
		await fetch(
			`/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) {
		await chapterDatabase.chapters.put({
			id: manga.id,
			chapters: -1
		});

		return null;
	}

	const lastChapterData = await (
		await fetch(`/mangadex/feed?id=${mangadexData['data'][0]['id']}`)
	).json();

	if (lastChapterData['data'] === undefined || lastChapterData['data'].length === 0) {
		await chapterDatabase.chapters.put({
			id: manga.id,
			chapters: -1
		});

		return null;
	}

	let lastChapterIndex = 0;

	while (lastChapterData['data'][lastChapterIndex]['attributes']['translatedLanguage'] !== 'en') {
		lastChapterIndex += 1;
	}

	let lastChapter = lastChapterData['data'][lastChapterIndex]['attributes']['chapter'];

	if (lastChapter == 0) {
		lastChapter = null;
	}

	await chapterDatabase.chapters.put({
		id: manga.id,
		chapters: lastChapter
	});

	return lastChapter;
};