'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    // Live `subject`/`html_body` become nullable — a brand-new template can
    // now exist as a pure draft with no live content at all until it's sent.
    await queryInterface.changeColumn('email_templates', 'subject', {
      type: Sequelize.STRING(255), allowNull: true,
    });
    await queryInterface.changeColumn('email_templates', 'html_body', {
      type: Sequelize.TEXT, allowNull: true,
    });

    await queryInterface.addColumn('email_templates', 'status', {
      type: Sequelize.ENUM('draft', 'sent'), allowNull: false, defaultValue: 'draft',
    });

    // Edits to a 'sent' template land here first — sendEmail() only ever reads
    // the live subject/html_body columns, never these — until an admin
    // explicitly re-sends (publishes), the pending edit can't affect real mail.
    await queryInterface.addColumn('email_templates', 'draft_subject', {
      type: Sequelize.STRING(255), allowNull: true,
    });
    await queryInterface.addColumn('email_templates', 'draft_html_body', {
      type: Sequelize.TEXT, allowNull: true,
    });
    await queryInterface.addColumn('email_templates', 'last_sent_at', {
      type: Sequelize.DATE, allowNull: true,
    });

    // Every row created before this migration already had required subject/
    // html_body — meaning it was already "operating" in the old single-state
    // world. Backfill them all as sent.
    await queryInterface.sequelize.query(`
      UPDATE email_templates SET status = 'sent', last_sent_at = "updatedAt";
    `);
  },

  async down(queryInterface) {
    await queryInterface.removeColumn('email_templates', 'last_sent_at');
    await queryInterface.removeColumn('email_templates', 'draft_html_body');
    await queryInterface.removeColumn('email_templates', 'draft_subject');
    await queryInterface.removeColumn('email_templates', 'status');
    await queryInterface.sequelize.query(`DROP TYPE IF EXISTS "enum_email_templates_status";`);
  },
};