'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('courses', {
      course_id:        { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
      uuid:             { type: Sequelize.UUID, defaultValue: Sequelize.UUIDV4, allowNull: false, unique: true },
      title:            { type: Sequelize.STRING(255), allowNull: false },
      description:      { type: Sequelize.TEXT, allowNull: true },
      course_code:      { type: Sequelize.STRING(50), allowNull: true, unique: true },
      order_index:      { type: Sequelize.INTEGER, allowNull: false, defaultValue: 0 },
      level:            { type: Sequelize.ENUM('beginner', 'intermediate', 'advanced'), allowNull: true },
      subscription:     { type: Sequelize.ENUM('free', 'premium'), allowNull: false, defaultValue: 'free' },
      duration_seconds: { type: Sequelize.INTEGER, allowNull: true, 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('courses', ['uuid']);
    await queryInterface.addIndex('courses', ['subscription']);
    await queryInterface.addIndex('courses', ['deletedAt']);
  },

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