'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('announcement_courses', {
      id: {
        type:          Sequelize.BIGINT,
        autoIncrement: true,
        primaryKey:    true,
      },
      announcement_id: {
        type:       Sequelize.BIGINT,
        allowNull:  false,
        references: { model: 'announcements', key: 'id' },
        onDelete:   'CASCADE',
      },
      course_id: {
        type:       Sequelize.BIGINT,
        allowNull:  false,
        references: { model: 'courses', key: 'course_id' },
        onDelete:   'CASCADE',
      },
    });

    await queryInterface.addConstraint('announcement_courses', {
      fields: ['announcement_id', 'course_id'],
      type:   'unique',
      name:   'uq_announcement_courses',
    });

    await queryInterface.addIndex('announcement_courses', { fields: ['announcement_id'], name: 'idx_announcement_courses_ann_id' });
    await queryInterface.addIndex('announcement_courses', { fields: ['course_id'],       name: 'idx_announcement_courses_course_id' });
  },

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