'use strict';

var async = require('async');
var plugins = require('../plugins');
var utils = require('../utils');
var db = require('./../database');
var batch = require('../batch');

module.exports = function (Groups) {
	Groups.destroy = function (groupName, callback) {
		Groups.getGroupsData([groupName], function (err, groupsData) {
			if (err) {
				return callback(err);
			}
			if (!Array.isArray(groupsData) || !groupsData[0]) {
				return callback();
			}
			var groupObj = groupsData[0];

			async.parallel([
				async.apply(db.delete, 'group:' + groupName),
				async.apply(db.sortedSetRemove, 'groups:createtime', groupName),
				async.apply(db.sortedSetRemove, 'groups:visible:createtime', groupName),
				async.apply(db.sortedSetRemove, 'groups:visible:memberCount', groupName),
				async.apply(db.sortedSetRemove, 'groups:visible:name', groupName.toLowerCase() + ':' + groupName),
				async.apply(db.delete, 'group:' + groupName + ':members'),
				async.apply(db.delete, 'group:' + groupName + ':pending'),
				async.apply(db.delete, 'group:' + groupName + ':invited'),
				async.apply(db.delete, 'group:' + groupName + ':owners'),
				async.apply(db.delete, 'group:' + groupName + ':member:pids'),
				async.apply(db.deleteObjectField, 'groupslug:groupname', utils.slugify(groupName)),
				function (next) {
					batch.processSortedSet('groups:createtime', function (groupNames, next) {
						var keys = groupNames.map(function (group) {
							return 'group:' + group + ':members';
						});
						db.sortedSetsRemove(keys, groupName, next);
					}, {
						batch: 500,
					}, next);
				},
			], function (err) {
				if (err) {
					return callback(err);
				}
				Groups.resetCache();
				plugins.fireHook('action:group.destroy', { group: groupObj });
				callback();
			});
		});
	};
};