import { Migration } from '@mikro-orm/migrations';

export class Migration20260422123253 extends Migration {

  override async up(): Promise<void> {
    // Create sequence for invoice_number
    this.addSql(`CREATE SEQUENCE IF NOT EXISTS invoice_number_seq START 1;`);
    
    // Set the sequence to start from the max existing invoice_number + 1
    this.addSql(`SELECT setval('invoice_number_seq', COALESCE((SELECT MAX(invoice_number) FROM invoices), 0) + 1, false);`);
    
    // Set default value for invoice_number to use the sequence
    this.addSql(`ALTER TABLE invoices ALTER COLUMN invoice_number SET DEFAULT nextval('invoice_number_seq');`);
  }

  override async down(): Promise<void> {
    // Remove default from invoice_number
    this.addSql(`ALTER TABLE invoices ALTER COLUMN invoice_number DROP DEFAULT;`);
    
    // Drop the sequence
    this.addSql(`DROP SEQUENCE IF EXISTS invoice_number_seq;`);
  }

}