import { recentMediaActivities, type Media } from '$lib/AniList/media';
import type { UserIdentity } from '../AniList/identity';
import { chapterDatabase } from './chapters';

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);
};