'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('course_achievements', {
      id:              { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
      course_id:       { type: Sequelize.BIGINT, allowNull: false },
      achievement_key: { type: Sequelize.STRING(100), allowNull: false },
      order_index:     { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 },
      createdAt:       { type: Sequelize.DATE, allowNull: false },
      updatedAt:       { type: Sequelize.DATE, allowNull: false },
    });

    await queryInterface.addIndex('course_achievements', ['course_id']);
    await queryInterface.addConstraint('course_achievements', {
      fields: ['course_id', 'achievement_key'],
      type: 'unique',
      name: 'course_achievements_course_id_key_unique',
    });
  },

  async down(queryInterface) {
    await queryInterface.dropTable('course_achievements');
  },
};