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;
	}

	console.log(
		`Caching ${manga.id} (${manga.title.english || manga.title.romaji || manga.title.native})`
	);

	let mangadexData = await (
		await fetch(
			`https://api.mangadex.org/manga?title=${encodeURIComponent(
				manga.title.english || manga.title.romaji || manga.title.native
			)}&year=${manga.startDate.year}`
		)
	).json();

	if (mangadexData['data'] === undefined || mangadexData['data'].length === 0) {
		mangadexData = await (
			await fetch(
				`https://api.mangadex.org/manga?title=${encodeURIComponent(manga.title.native)}&year=${
					manga.startDate.year
				}`
			)
		).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(
			`https://api.mangadex.org/manga/${mangadexData['data'][0]['id']}/feed?order[chapter]=desc`
		)
	).json();

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

		return null;
	}

	let lastChapter = lastChapterData['data'][0]['attributes']['chapter'];

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

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

	return lastChapter;
};