'use strict';

const async = require('async');
const db = require('../../database');

const batch = require('../../batch');
// var user = require('../../user');

module.exports = {
	name: 'Upgrade bans to hashes',
	timestamp: Date.UTC(2018, 8, 24),
	method: function (callback) {
		const { progress } = this;

		batch.processSortedSet('users:joindate', (uids, next) => {
			async.eachSeries(uids, (uid, next) => {
				progress.incr();

				async.parallel({
					bans: function (next) {
						db.getSortedSetRevRangeWithScores(`uid:${uid}:bans`, 0, -1, next);
					},
					reasons: function (next) {
						db.getSortedSetRevRangeWithScores(`banned:${uid}:reasons`, 0, -1, next);
					},
					userData: function (next) {
						db.getObjectFields(`user:${uid}`, ['banned', 'banned:expire', 'joindate', 'lastposttime', 'lastonline'], next);
					},
				}, (err, results) => {
					function addBan(key, data, callback) {
						async.waterfall([
							function (next) {
								db.setObject(key, data, next);
							},
							function (next) {
								db.sortedSetAdd(`uid:${uid}:bans:timestamp`, data.timestamp, key, next);
							},
						], callback);
					}
					if (err) {
						return next(err);
					}
					// has no ban history and isn't banned, skip
					if (!results.bans.length && !parseInt(results.userData.banned, 10)) {
						return next();
					}

					// has no history, but is banned, create plain object with just uid and timestmap
					if (!results.bans.length && parseInt(results.userData.banned, 10)) {
						const banTimestamp = results.userData.lastonline || results.userData.lastposttime || results.userData.joindate || Date.now();
						const banKey = `uid:${uid}:ban:${banTimestamp}`;
						addBan(banKey, { uid: uid, timestamp: banTimestamp }, next);
						return;
					}

					// process ban history
					async.eachSeries(results.bans, (ban, next) => {
						function findReason(score) {
							return results.reasons.find(reasonData => reasonData.score === score);
						}
						const reasonData = findReason(ban.score);
						const banKey = `uid:${uid}:ban:${ban.score}`;
						const data = {
							uid: uid,
							timestamp: ban.score,
							expire: parseInt(ban.value, 10),
						};
						if (reasonData) {
							data.reason = reasonData.value;
						}
						addBan(banKey, data, next);
					}, (err) => {
						next(err);
					});
				});
			}, next);
		}, {
			progress: this.progress,
		}, callback);
	},
};