'use strict';

var async = require('async');

exports.up = function(db, callback) {
    async.series([
        db.runSql.bind(db, 'CREATE TABLE groupMembers_copy(groupId VARCHAR(128) NOT NULL, userId VARCHAR(128) NOT NULL, FOREIGN KEY(groupId) REFERENCES userGroups(id), FOREIGN KEY(userId) REFERENCES users(id), UNIQUE (groupId, userId)) CHARACTER SET utf8 COLLATE utf8_bin'),    // In mysql CREATE TABLE.. LIKE does not copy indexes
        db.runSql.bind(db, 'INSERT INTO groupMembers_copy SELECT * FROM groupMembers GROUP BY groupId, userId'),
        db.runSql.bind(db, 'DROP TABLE groupMembers'),
        db.runSql.bind(db, 'ALTER TABLE groupMembers_copy RENAME TO groupMembers')
    ], callback);
};

exports.down = function(db, callback) {
    async.series([
        db.runSql.bind(db, 'ALTER TABLE groupMembers DROP INDEX groupMembers_member'),
    ], callback);
};