import cron from 'node-cron';
import delay from 'delay';
import { Not } from 'typeorm';

import { deleteUser } from '../functions/users';
import { MiUser, updateScore } from '../functions/update-score';
import { updateRating } from '../functions/update-rating';
import { AlertMode } from '../../common/types/alert-mode';
import { Users } from '../models';
import { sendAlert } from './send-alert';
import { api } from './misskey';
import * as Store from '../store';
import { User } from '../models/entities/user';

export default (): void => {
	cron.schedule('0 0 0 * * *', work);
};

export const work = async () => {
	Store.dispatch({ nowCalculating: true });

	clearLog();

	printLog('Started.');

	try {
		const users = await Users.find({ alertMode: Not<AlertMode>('nothing') });
		printLog('will process ' + users.length + ' accounts.');
		for (const user of users) {
			await update(user).catch(e => handleError(user, e));
			printLog(`processed for ${user.username}@${user.host}`);

			if (user.alertMode === 'note') {
				await delay(3000);
			}
		}
		printLog('finished successfully.');
	} catch (e) {
		const msg = String(e instanceof Error ? e.stack : e);
		printLog(msg);
		printLog('stopped wrongly.');
	} finally {
		Store.dispatch({ nowCalculating: false });
	}
};

const clearLog = () => {
	Store.dispatch({ misshaiWorkerLog: [] });
};

const printLog = (log: any) => {
	Store.dispatch({ misshaiWorkerLog: [
		...Store.getState().misshaiWorkerLog,
		String(log),
	] });
};

/**
 * アラートを送信します。
 * @param user アラートの送信先ユーザー
 */
const update = async (user: User) => {
	const miUser = await api<MiUser & { error: unknown }>(user.host, 'users/show', { username: user.username }, user.token);
	if (miUser.error) throw miUser.error;

	await updateRating(user, miUser);
	await sendAlert(user);

	await updateScore(user, miUser);
};

/**
 * アラート送信失敗のエラーをハンドリングします。
 * @param user 送信に失敗したアラートの送信先ユーザー
 * @param e エラー。ErrorだったりObjectだったりするのでanyだけど、いずれ型定義したい
 */
const handleError = async (user: User, e: any) => {
	if (e.code) {
		if (e.code === 'NO_SUCH_USER' || e.code === 'AUTHENTICATION_FAILED') {
			// ユーザーが削除されている場合、レコードからも消してとりやめ
			printLog(`${user.username}@${user.host} is deleted, so delete this user from the system`);
			await deleteUser(user.username, user.host);
		} else {
			printLog(`Misskey Error: ${JSON.stringify(e)}`);
		}
	} else {
		// おそらく通信エラー
		printLog(`Unknown error: ${e.name} ${e.message}`);
	}
};