declare var self: ServiceWorkerGlobalScope;

import { get } from 'idb-keyval';
import { pushNotificationData } from '../../types';

type Accounts = {
	[x: string]: {
		queue: string[],
		timeout: number | null,
		token: string,
	}
};

class SwNotificationRead {
	private accounts: Accounts = {};

	public async construct() {
		const accounts = await get('accounts') as { i: string, id: string }[];
		if (accounts) Error('Account is not recorded');

		this.accounts = accounts.reduce((acc, e) => {
			acc[e.id] = {
				queue: [],
				timeout: null,
				token: e.i,
			};
			return acc;
		}, {} as Accounts);

		return this;
	}

	// プッシュ通知の既読をサーバーに送信
	public async read(data: pushNotificationData) {
		if (data.type !== 'notification' || !(data.userId in this.accounts)) return;

		const account = this.accounts[data.userId];

		account.queue.push(data.body.id);

		// 最後の呼び出しから100ms待ってまとめて処理する
		if (account.timeout) clearTimeout(account.timeout);
		account.timeout = setTimeout(() => {
			account.timeout = null;

			console.info(account.token, account.queue);
			fetch(`${location.origin}/api/notifications/read`, {
				method: 'POST',
				body: JSON.stringify({
					i: account.token,
					notificationIds: account.queue
				})
			}).then(res => {
				self.registration.showNotification('notificationread', { body: `${account.queue}, ${res.ok}` });
			});
		}, 100);
	}
}

export const swNotificationRead = (new SwNotificationRead()).construct();