import type { AniListAuthorisation } from '$lib/AniList/identity';
import type { UserIdentity } from './identity';
import anime from '../../stores/anime';
import manga from '../../stores/manga';
import settings from '../../stores/settings';
import lastPruneTimes from '../../stores/lastPruneTimes';

export enum Type {
	Anime,
	Manga
}

export interface Media {
	id: number;
	status: string;
	type: string;
	episodes: number;
	format: string;
	title: {
		romaji: string;
		english: string;
		native: string;
	};
	nextAiringEpisode?: {
		episode: number;
		timeUntilAiring?: number;
	};
	mediaListEntry?: {
		progress: number;
		status: string;
	};
	startDate: {
		year: number;
	};
}

export const flattenLists = (lists: { entries: { media: Media }[] }[]) => {
	if (lists === undefined) {
		return [];
	}

	let flattenedList: { media: Media }[] = [];
	const minimisedList: Media[] = [];

	for (const list of lists) {
		flattenedList = flattenedList.concat(list.entries);
	}

	for (const [position, entry] of flattenedList.entries()) {
		minimisedList[position] = entry.media;
	}

	return minimisedList;
};

export const mediaListCollection = async (
	anilistAuthorisation: AniListAuthorisation,
	userIdentity: UserIdentity,
	type: Type,
	mediaCache: string | undefined,
	currentLastPruneAt: string | number,
	forcePrune = false
): Promise<Media[]> => {
	let currentCacheMinutes;

	settings.subscribe((value) => {
		currentCacheMinutes = value.cacheMinutes;
	});

	if (String(currentLastPruneAt) === '') {
		if (type === Type.Anime) {
			lastPruneTimes.setKey('anime', new Date().getTime());
		} else {
			lastPruneTimes.setKey('manga', new Date().getTime());
		}
	} else {
		if (
			(new Date().getTime() - Number(currentLastPruneAt)) / 1000 / 60 >
				Number(currentCacheMinutes) ||
			forcePrune
		) {
			if (type === Type.Anime) {
				lastPruneTimes.setKey('anime', new Date().getTime());
				anime.set('');
			} else {
				lastPruneTimes.setKey('manga', new Date().getTime());
				manga.set('');
			}

			mediaCache = '';
		}
	}

	if (mediaCache !== undefined && mediaCache !== '') {
		return JSON.parse(mediaCache);
	}

	const userIdResponse = await (
		await fetch('https://graphql.anilist.co', {
			method: 'POST',
			headers: {
				Authorization: `${anilistAuthorisation.tokenType} ${anilistAuthorisation.accessToken}`,
				'Content-Type': 'application/json',
				Accept: 'application/json'
			},
			body: JSON.stringify({
				query: `{ MediaListCollection(userId: ${userIdentity.id}, type: ${
					type === Type.Anime ? 'ANIME' : 'MANGA'
				}, status_not_in: [ COMPLETED ]) {
            lists { entries { media {
              id
              status
              type
              episodes
              format
              title { romaji english native }
              nextAiringEpisode { episode timeUntilAiring }
              mediaListEntry { progress status }
              startDate { year }
            } } }
          }
        }`
			})
		})
	).json();

	if (mediaCache === '') {
		if (type === Type.Anime) {
			anime.set(
				JSON.stringify(flattenLists(userIdResponse['data']['MediaListCollection']['lists']))
			);
		} else {
			manga.set(
				JSON.stringify(flattenLists(userIdResponse['data']['MediaListCollection']['lists']))
			);
		}
	}

	return flattenLists(userIdResponse['data']['MediaListCollection']['lists']);
};

export const publicMediaListCollection = async (userId: number, type: Type): Promise<Media[]> => {
	const userIdResponse = await (
		await fetch('https://graphql.anilist.co', {
			method: 'POST',
			headers: {
				'Content-Type': 'application/json',
				Accept: 'application/json'
			},
			body: JSON.stringify({
				query: `{ MediaListCollection(userId: ${userId}, type: ${
					type === Type.Anime ? 'ANIME' : 'MANGA'
				}, status_not_in: [ COMPLETED ]) {
            lists { entries { media {
              id
              status
              type
              episodes
              format
              title { romaji english native }
              nextAiringEpisode { episode timeUntilAiring }
              mediaListEntry { progress status }
              startDate { year }
            } } }
          }
        }`
			})
		})
	).json();

	return flattenLists(userIdResponse['data']['MediaListCollection']['lists']);
};