'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    const columns = await queryInterface.describeTable('users');
    if (!columns.login) {
      await queryInterface.addColumn('users', 'login', {
        type: Sequelize.STRING(255),
        allowNull: true,
      });
    }

    await queryInterface.sequelize.query(
      "UPDATE `users` SET `login` = `email` WHERE `login` IS NULL OR `login` = ''",
    );
    await queryInterface.changeColumn('users', 'login', {
      type: Sequelize.STRING(255),
      allowNull: false,
    });

    const indexes = await queryInterface.showIndex('users');
    if (!indexes.some((index) => index.name === 'users_login_unique')) {
      await queryInterface.addIndex('users', ['login'], {
        name: 'users_login_unique',
        unique: true,
      });
    }
  },

  async down(queryInterface) {
    const indexes = await queryInterface.showIndex('users');
    if (indexes.some((index) => index.name === 'users_login_unique')) {
      await queryInterface.removeIndex('users', 'users_login_unique');
    }
    const columns = await queryInterface.describeTable('users');
    if (columns.login) await queryInterface.removeColumn('users', 'login');
  },
};