'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('lesson_objectives', {
      objective_id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
      lesson_id:    { type: Sequelize.BIGINT, allowNull: false, references: { model: 'lessons', key: 'lesson_id' }, onDelete: 'CASCADE' },
      text:         { type: Sequelize.TEXT, allowNull: false },
      order_index:  { type: Sequelize.INTEGER, defaultValue: 0 },
      createdAt:    { type: Sequelize.DATE, allowNull: false },
      updatedAt:    { type: Sequelize.DATE, allowNull: false },
      deletedAt:    { type: Sequelize.DATE, allowNull: true },
    });

    await queryInterface.addIndex('lesson_objectives', ['lesson_id']);
  },

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