import { fApi } from "./helpers/index";

import chalk from "chalk-template";

import type { ContentPost, VideoContent } from "floatplane/content";
import type { ChannelOptions, SubscriptionSettings } from "./types";

import { Attachment } from "./Attachment";
import { settings } from "./helpers/index";
import { Video } from "./Video";

const removeRepeatedSentences = (postTitle: string, attachmentTitle: string) => {
	const separators = /(?:\s+|^)((?:[^.,;:!?-]+[\s]*[.,;:!?-]+)+)(?:\s+|$)/g;
	const postTitleSentences = postTitle.match(separators)?.map((sentence) => sentence.trim());
	const attachmentTitleSentences = attachmentTitle.match(separators)?.map((sentence) => sentence.trim());

	const uniqueAttachmentTitleSentences = attachmentTitleSentences?.filter((sentence) => !postTitleSentences?.includes(sentence));

	if (uniqueAttachmentTitleSentences === undefined) return `${postTitle.trim()} - ${attachmentTitle.trim()}`.trim();

	// Remove trailing separator
	return `${postTitle.trim()} - ${uniqueAttachmentTitleSentences.join("").trim()}`.trim().replace(/[\s]*[.,;:!?-]+[\s]*$/, "");
};

type isChannel = (post: ContentPost, video?: VideoContent) => boolean;
export default class Subscription {
	public readonly creatorId: string;
	public readonly channels: SubscriptionSettings["channels"];
	public readonly plan: string;

	constructor(subscription: SubscriptionSettings) {
		this.creatorId = subscription.creatorId;
		this.channels = subscription.channels;
		this.plan = subscription.plan;
	}

	public deleteOldVideos = async () => {
		for (const channel of this.channels) {
			if (channel.daysToKeepVideos !== undefined) {
				const ignoreBeforeTimestamp = Subscription.getIgnoreBeforeTimestamp(channel);
				let deletedVideos = 0;

				for (const video of Video.find((video) => {
					return video.releaseDate < ignoreBeforeTimestamp && video.channelTitle === channel.title;
				})) {
					deletedVideos++;
					await new Attachment({
						...video,
						releaseDate: new Date(video.releaseDate),
					}).delete();
				}
				console.log(chalk`[{yellow ${channel.title}}] deleted {redBright ${deletedVideos}} videos older than {cyanBright ${channel.daysToKeepVideos}} days`);
			}
		}
	};

	private static getIgnoreBeforeTimestamp = (channel: ChannelOptions) => Date.now() - (channel.daysToKeepVideos ?? 0) * 24 * 60 * 60 * 1000;
	private static isChannelCache: Record<string, isChannel> = {};
	private static isChannelHelper = `const isChannel = (post, channelId) => (typeof post.channel !== 'string' ? post.channel.id : post.channel) === channelId`;

	private async *matchChannel(blogPost: ContentPost): AsyncGenerator<Video> {
		if (blogPost.videoAttachments === undefined) return;
		let dateOffset = 0;
		for (const videoAttachment of blogPost.videoAttachments.sort((a, b) => blogPost.attachmentOrder.indexOf(a.id) - blogPost.attachmentOrder.indexOf(b.id))) {
			// Make sure we have a unique object for each attachment
			const post = { ...blogPost };
			const video: VideoContent = await fApi.content.video(videoAttachment.id);
			// Skip videos with no levels
			if (video.levels.length === 0) continue;

			if (blogPost.videoAttachments.length > 1) {
				dateOffset++;
				post.title = removeRepeatedSentences(post.title, video.title);
			}

			for (const channel of this.channels) {
				if (channel.isChannel === undefined) continue;
				const isChannel =
					Subscription.isChannelCache[channel.isChannel] ??
					(Subscription.isChannelCache[channel.isChannel] = new Function(`${Subscription.isChannelHelper};return ${channel.isChannel};`)() as isChannel);

				if (!isChannel(post, video)) continue;
				if (channel.skip) break;
				if (channel.daysToKeepVideos !== undefined && new Date(post.releaseDate).getTime() < Subscription.getIgnoreBeforeTimestamp(channel)) return;

				// Remove the identifier from the video title if to give a nicer title
				if (settings.extras.stripSubchannelPrefix === true) {
					const replacers = [
						new RegExp(channel.title.replace(/[-/\\^$*+?.()|[\]{}]/g, "\\$&"), "i"),
						/MA: /i,
						/FP Exclusive: /i,
						/talklinked/i,
						/TL: /i,
						/TL Short: /i,
						/TQ: /i,
						/TJM: /i,
						/SC: /i,
						/CSF: /i,
						/Livestream VOD – /i,
						/ : /i,
					];
					for (const regIdCheck of replacers) {
						post.title = post.title.replace(regIdCheck, "");
					}

					post.title = post.title.replaceAll("  ", " ");
					if (post.title.startsWith(": ")) post.title = post.title.replace(": ", "");

					post.title = post.title.trim();
				}
				yield Video.getOrCreate({
					attachmentId: videoAttachment.id,
					description: post.text,
					artworkUrl: post.thumbnail?.path,
					channelTitle: channel.title,
					videoTitle: post.title,
					releaseDate: new Date(new Date(post.releaseDate).getTime() + dateOffset * 1000),
					textTracks: video.textTracks,
				});
				break;
			}
		}
	}

	public async *fetchNewVideos(): AsyncGenerator<Video> {
		if (settings.floatplane.videosToSearch === 0) return;
		let videosSearched = 0;
		console.log(chalk`Searching for new videos in {yellow ${this.plan}}`);
		for await (const blogPost of fApi.creator.blogPostsIterable(this.creatorId)) {
			if (!blogPost.metadata.hasVideo) continue;
			for await (const video of this.matchChannel(await fApi.content.post(blogPost.id))) {
				yield video;
			}

			// Stop searching if we have looked through videosToSearch
			if (++videosSearched >= settings.floatplane.videosToSearch) break;
		}
	}

	public async *seekAndDestroy(contentPost: ContentPost): AsyncGenerator<Video> {
		for await (const video of this.matchChannel(contentPost)) yield video;
	}
}