import type { DatabaseSync } from "node:sqlite";

// Idempotent: safe to run against a fresh db (already created from schema.sql
// with the `role` column) or an existing one that predates it.
export function up(db: DatabaseSync): void {
  const userCols = db.prepare(`PRAGMA table_info(users);`).all() as {
    name: string;
  }[];
  if (!userCols.some((c) => c.name === "role")) {
    db.exec(
      `ALTER TABLE users ADD COLUMN role TEXT NOT NULL DEFAULT 'user';`,
    );
  }

  // Backfill existing admins to role 'admin'. Guarded because the legacy
  // is_admin column is absent on fresh databases (and dropped by 0005).
  if (userCols.some((c) => c.name === "is_admin")) {
    db.exec(
      `UPDATE users SET role = 'admin' WHERE is_admin = 1 AND role != 'admin';`,
    );
  }
}