'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('quiz_questions', {
      question_id:   { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
      uuid:          { type: Sequelize.UUID, defaultValue: Sequelize.UUIDV4, unique: true },
      quiz_id:       { type: Sequelize.BIGINT, allowNull: true, references: { model: 'unit_quizzes',      key: 'quiz_id'       }, onDelete: 'CASCADE' },
      assessment_id: { type: Sequelize.BIGINT, allowNull: true, references: { model: 'course_assessments', key: 'assessment_id' }, onDelete: 'CASCADE' },
      type:          { type: Sequelize.ENUM('true_false', 'multiple_choice', 'multi_select'), allowNull: false },
      question:      { type: Sequelize.TEXT, allowNull: false },
      explanation:   { type: Sequelize.TEXT, allowNull: true },
      order_index:   { type: Sequelize.INTEGER, defaultValue: 0 },
      points:        { type: Sequelize.INTEGER, defaultValue: 1 },
      createdBy:     { 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('quiz_questions', ['quiz_id']);
    await queryInterface.addIndex('quiz_questions', ['assessment_id']);
  },

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