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path: root/src/lib/Media/Anime/Airing/animeSchedule.ts
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// Data model for AnimeSchedule.net's weekly timetable, the source of truth for
// when subbed and dubbed episodes actually release. Unlike a fansub schedule,
// every release carries an absolute timestamp, an episode number, delay windows,
// and the streaming platforms it lands on.

export type AirType = "sub" | "dub";

export interface Stream {
	platform: string;
	url: string;
	name: string;
}

// A single scheduled episode release for one show.
export interface AiringEntry {
	route: string;
	title: string;
	romaji: string;
	english: string;
	native: string;
	episodeNumber: number;
	airingAt: number;
	delayedUntil?: number;
	imageUrl: string;
	streams: Stream[];
}

// The merged sub + dub schedule for the current week.
export interface AiringSchedule {
	generatedAt: number;
	sub: AiringEntry[];
	dub: AiringEntry[];
}

const IMAGE_BASE =
	"https://img.animeschedule.net/production/assets/public/img/";

const animeScheduleImageUrl = (imageVersionRoute: string): string =>
	imageVersionRoute ? `${IMAGE_BASE}${imageVersionRoute}` : "";

// AnimeSchedule uses 0001-01-01 as its "no date" sentinel.
const isZeroDate = (value: string | undefined): boolean =>
	!value || value.startsWith("0001-01-01");

const toEpochSeconds = (value: string | undefined): number =>
	isZeroDate(value)
		? 0
		: Math.floor(new Date(value as string).getTime() / 1000);

// Stream URLs come back without a scheme (e.g. "www.hidive.com/...").
const withScheme = (url: string): string =>
	!url ? "" : /^https?:\/\//.test(url) ? url : `https://${url}`;

interface RawTimetableEntry {
	title: string;
	route: string;
	romaji: string;
	english: string;
	native: string;
	episodeNumber: number;
	episodeDate: string;
	delayedUntil: string;
	imageVersionRoute: string;
	streams: { platform: string; url: string; name: string }[];
}

export const parseTimetable = (raw: unknown): AiringEntry[] => {
	if (!Array.isArray(raw)) return [];

	return (raw as RawTimetableEntry[]).map((entry) => {
		const delayedUntil = toEpochSeconds(entry.delayedUntil);

		return {
			route: entry.route,
			title: entry.english || entry.romaji || entry.title,
			romaji: entry.romaji || "",
			english: entry.english || "",
			native: entry.native || "",
			episodeNumber: entry.episodeNumber,
			airingAt: toEpochSeconds(entry.episodeDate),
			delayedUntil: delayedUntil || undefined,
			imageUrl: animeScheduleImageUrl(entry.imageVersionRoute),
			streams: (entry.streams || []).map((stream) => ({
				platform: stream.platform,
				url: withScheme(stream.url),
				name: stream.name,
			})),
		};
	});
};

const TIMETABLE_ENDPOINT = "https://animeschedule.net/api/v3/timetables";

// Fetch and parse the current week's sub and dub timetables in one shot. The
// caller supplies the AnimeSchedule application token.
export const fetchTimetables = async (
	token: string,
): Promise<{ sub: AiringEntry[]; dub: AiringEntry[] }> => {
	const fetchOne = async (airType: AirType): Promise<AiringEntry[]> => {
		try {
			const response = await fetch(`${TIMETABLE_ENDPOINT}?airType=${airType}`, {
				headers: { Authorization: `Bearer ${token}` },
			});

			return response.ok ? parseTimetable(await response.json()) : [];
		} catch {
			return [];
		}
	};

	const [sub, dub] = await Promise.all([fetchOne("sub"), fetchOne("dub")]);

	return { sub, dub };
};