import {Link, Store} from '../store/model';
import {Print, logger} from '../logger';
import {RefreshableAuthProvider, StaticAuthProvider} from 'twitch-auth';
import {existsSync, promises, readFileSync} from 'fs';
import {ChatClient} from 'twitch-chat-client';
import {config} from '../config';

const {twitch} = config.notifications;

const messages: string[] = [];
let alreadySaying = false;

let tokenData = {
	accessToken: twitch.accessToken,
	expiryTimestamp: 0,
	refreshToken: twitch.refreshToken
};

if (existsSync('./twitch.json')) {
	tokenData = {
		...JSON.parse(readFileSync('./twitch.json', 'utf-8')),
		...tokenData
	};
}

const chatClient: ChatClient = new ChatClient(
	new RefreshableAuthProvider(
		new StaticAuthProvider(twitch.clientId, tokenData.accessToken),
		{
			clientSecret: twitch.clientSecret,
			expiry:
				tokenData.expiryTimestamp === null
					? null
					: new Date(tokenData.expiryTimestamp),
			onRefresh: async ({accessToken, refreshToken, expiryDate}) => {
				return promises.writeFile(
					'./twitch.json',
					JSON.stringify(
						{
							accessToken,
							expiryTimestamp:
								expiryDate === null
									? null
									: expiryDate.getTime(),
							refreshToken
						},
						null,
						4
					),
					'utf-8'
				);
			},
			refreshToken: tokenData.refreshToken
		}
	),
	{
		channels: [twitch.channel]
	}
);

chatClient.onJoin((channel: string, user: string) => {
	if (channel === `#${twitch.channel}` && user === chatClient.currentNick) {
		while (messages.length) {
			const message: string | undefined = messages.shift();

			if (message !== undefined) {
				try {
					void chatClient.say(channel, message);
					logger.info('✔ twitch message sent');
				} catch (error: unknown) {
					logger.error("✖ couldn't send twitch message", error);
				}
			}
		}
	}

	void chatClient.quit();
});

chatClient.onDisconnect(() => {
	alreadySaying = false;
});

export function sendTwitchMessage(link: Link, store: Store) {
	if (
		tokenData.accessToken &&
		twitch.channel &&
		twitch.clientId &&
		twitch.clientSecret &&
		tokenData.refreshToken
	) {
		logger.debug('↗ sending twitch message');

		messages.push(
			`${Print.inStock(link, store)}\n${
				link.cartUrl ? link.cartUrl : link.url
			}`
		);

		if (!alreadySaying) {
			alreadySaying = true;
			void chatClient.connect();
		}
	}
}