'use strict';

// Backfill migration: this table already exists live (created outside of
// sequelize-cli before migration coverage was complete). Written to match
// the live CockroachDB schema exactly so a fresh install/cutover recreates
// it. On the existing production DB, mark this filename as already applied
// in SequelizeMeta instead of running it — see project notes.

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('certificates', {
      certificate_id: { type: Sequelize.BIGINT, primaryKey: true, autoIncrement: true },
      uuid:           { type: Sequelize.UUID, allowNull: false, unique: true, defaultValue: Sequelize.literal('gen_random_uuid()') },
      cert_no:        { type: Sequelize.STRING(25), allowNull: false, unique: true },
      ref_no:         { type: Sequelize.STRING(50), allowNull: false },
      user_id:        { type: Sequelize.BIGINT, allowNull: false, references: { model: 'users', key: 'user_id' }, onDelete: 'CASCADE' },
      course_id:      { type: Sequelize.BIGINT, allowNull: false, references: { model: 'courses', key: 'course_id' }, onDelete: 'CASCADE' },
      instructors:    { type: Sequelize.TEXT, allowNull: true },
      score:          { type: Sequelize.BIGINT, allowNull: true },
      length_str:     { type: Sequelize.STRING(50), allowNull: true },
      issued_at:      { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
      created_at:     { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
      updated_at:     { type: Sequelize.DATE, allowNull: false, defaultValue: Sequelize.NOW },
    });

    await queryInterface.addConstraint('certificates', {
      fields: ['user_id', 'course_id'],
      type: 'unique',
      name: 'certificates_user_id_course_id_key',
    });

    await queryInterface.addIndex('certificates', ['course_id'], { name: 'idx_certificates_course_id' });
    await queryInterface.addIndex('certificates', ['user_id'], { name: 'idx_certificates_user_id' });
    await queryInterface.addIndex('certificates', ['uuid'], { name: 'idx_certificates_uuid' });
  },

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