import { URL } from 'url';
import * as Bull from 'bull';
import request from '@/remote/activitypub/request';
import { registerOrFetchInstanceDoc } from '@/services/register-or-fetch-instance-doc';
import Logger from '@/services/logger';
import { Instances } from '@/models/index';
import { apRequestChart, federationChart, instanceChart } from '@/services/chart/index';
import { fetchInstanceMetadata } from '@/services/fetch-instance-metadata';
import { fetchMeta } from '@/misc/fetch-meta';
import { toPuny } from '@/misc/convert-host';
import { Cache } from '@/misc/cache';
import { Instance } from '@/models/entities/instance';
import { DeliverJobData } from '../types';
import { StatusError } from '@/misc/fetch';

const logger = new Logger('deliver');

let latest: string | null = null;

const suspendedHostsCache = new Cache<Instance[]>(1000 * 60 * 60);

export default async (job: Bull.Job<DeliverJobData>) => {
	const { host } = new URL(job.data.to);

	// ブロックしてたら中断
	const meta = await fetchMeta();
	if (meta.blockedHosts.includes(toPuny(host))) {
		return 'skip (blocked)';
	}

	// isSuspendedなら中断
	let suspendedHosts = suspendedHostsCache.get(null);
	if (suspendedHosts == null) {
		suspendedHosts = await Instances.find({
			where: {
				isSuspended: true,
			},
		});
		suspendedHostsCache.set(null, suspendedHosts);
	}
	if (suspendedHosts.map(x => x.host).includes(toPuny(host))) {
		return 'skip (suspended)';
	}

	try {
		if (latest !== (latest = JSON.stringify(job.data.content, null, 2))) {
			logger.debug(`delivering ${latest}`);
		}

		await request(job.data.user, job.data.to, job.data.content);

		// Update stats
		registerOrFetchInstanceDoc(host).then(i => {
			Instances.update(i.id, {
				latestRequestSentAt: new Date(),
				latestStatus: 200,
				lastCommunicatedAt: new Date(),
				isNotResponding: false,
			});

			fetchInstanceMetadata(i);

			instanceChart.requestSent(i.host, true);
			apRequestChart.deliverSucc();
			federationChart.deliverd(i.host);
		});

		return 'Success';
	} catch (res) {
		// Update stats
		registerOrFetchInstanceDoc(host).then(i => {
			Instances.update(i.id, {
				latestRequestSentAt: new Date(),
				latestStatus: res instanceof StatusError ? res.statusCode : null,
				isNotResponding: true,
			});

			instanceChart.requestSent(i.host, false);
			apRequestChart.deliverFail();
		});

		if (res instanceof StatusError) {
			// 4xx
			if (res.isClientError) {
				// HTTPステータスコード4xxはクライアントエラーであり、それはつまり
				// 何回再送しても成功することはないということなのでエラーにはしないでおく
				return `${res.statusCode} ${res.statusMessage}`;
			}

			// 5xx etc.
			throw `${res.statusCode} ${res.statusMessage}`;
		} else {
			// DNS error, socket error, timeout ...
			throw res;
		}
	}
};