doctype html

html
	head
		meta(charset='utf-8')
		meta(name='application-name' content='FoundKey')
		title Flushing FoundKey
		style
			include ../error.css
	#msg
	script.
		const msg = document.getElementById('msg');
		const successText = `\nSuccess Flush! <a href="/">Back to FoundKey</a>\nSuccess, <a href="/">please reopen FoundKey.</a>`;

		message('Start flushing.');

		(async function() {
			try {
				localStorage.clear();
				message('localStorage cleared.');

				const idbPromises = ['FoundKeyClient', 'keyval-store'].map((name, i, arr) => new Promise((res, rej) => {
					const delidb = indexedDB.deleteDatabase(name);
					delidb.onsuccess = () => res(message(`indexedDB "${name}" cleared. (${i + 1}/${arr.length})`));
					delidb.onerror = e => rej(e)
				}));

				await Promise.all(idbPromises);

				if (navigator.serviceWorker.controller) {
					navigator.serviceWorker.controller.postMessage('clear');
					await navigator.serviceWorker.getRegistrations()
						.then(registrations => {
							return Promise.all(registrations.map(registration => registration.unregister()));
						})
						.catch(e => { throw Error(e) });
				}

				message(successText);
			} catch (e) {
				message(`\n${e}\n\nFlush Failed. <a href="/flush">Please retry.</a>\n失敗しました。<a href="/flush">もう一度試してみてください。</a>`);
				message(`\nIf you retry more than 3 times, clear the browser cache or contact to instance admin.\n3回以上試しても失敗する場合、ブラウザのキャッシュを消去し、それでもだめならインスタンス管理者に連絡してみてください。\n`)

				console.error(e);
				setTimeout(() => {
					location = '/';
				}, 10000)
			}
		})();

		function message(text) {
			msg.insertAdjacentHTML('beforeend', `<p>[${(new Date()).toString()}] ${text.replace(/\n/g,'<br>')}</p>`)
		}