'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('lessons', {
      lesson_id:        { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
      uuid:             { type: Sequelize.UUID, defaultValue: Sequelize.UUIDV4, allowNull: false, unique: true },
      unit_id:          { type: Sequelize.BIGINT, allowNull: false, references: { model: 'units', key: 'unit_id' }, onDelete: 'CASCADE' },
      title:            { type: Sequelize.STRING(255), allowNull: false },
      description:      { type: Sequelize.TEXT, allowNull: true },
      duration_seconds: { type: Sequelize.INTEGER, allowNull: true, defaultValue: 0 },
      order_index:      { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 },
      createdBy:        { type: Sequelize.BIGINT, allowNull: true },
      updatedBy:        { type: Sequelize.BIGINT, allowNull: true },
      deletedBy:        { type: Sequelize.BIGINT, allowNull: true },
      createdAt:        { type: Sequelize.DATE, allowNull: false },
      updatedAt:        { type: Sequelize.DATE, allowNull: false },
      deletedAt:        { type: Sequelize.DATE, allowNull: true },
    });

    await queryInterface.addIndex('lessons', ['uuid']);
    await queryInterface.addIndex('lessons', ['unit_id']);
    await queryInterface.addIndex('lessons', ['order_index']);
    await queryInterface.addIndex('lessons', ['deletedAt']);
  },

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