'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('assessment_sessions', {
      session_id:    { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
      uuid:          { type: Sequelize.UUID, defaultValue: Sequelize.UUIDV4, unique: true, allowNull: false },
      user_id:       { type: Sequelize.BIGINT, allowNull: false, references: { model: 'users', key: 'user_id' }, onDelete: 'CASCADE' },
      assessment_id: { type: Sequelize.BIGINT, allowNull: false, references: { model: 'course_assessments', key: 'assessment_id' }, onDelete: 'CASCADE' },
      course_id:     { type: Sequelize.BIGINT, allowNull: true },
      started_at:    { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
      expires_at:    { type: Sequelize.DATE, allowNull: true },
      status:        { type: Sequelize.STRING(20), allowNull: false, defaultValue: 'in_progress' },
      attempt_id:    { type: Sequelize.BIGINT, allowNull: true },
      createdAt:     { type: Sequelize.DATE, allowNull: false },
      updatedAt:     { type: Sequelize.DATE, allowNull: false },
    });

    await queryInterface.addIndex('assessment_sessions', ['user_id'],       { name: 'idx_as_user_id' });
    await queryInterface.addIndex('assessment_sessions', ['assessment_id'], { name: 'idx_as_assessment_id' });
    await queryInterface.addIndex('assessment_sessions', ['status'],        { name: 'idx_as_status' });
  },

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