/**
 * Adds `users.role`, which replaces the `is_admin` flag so that moderators can
 * exist between users and admins. 0005 then drops the flag.
 *
 * @module
 */

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

/**
 * Run once by `runMigrations`. Every user becomes a `user`, except those with
 * `is_admin` set, who become admins.
 */
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';`,
    );
  }

  // schema.sql never had is_admin.
  if (userCols.some((c) => c.name === "is_admin")) {
    db.exec(
      `UPDATE users SET role = 'admin' WHERE is_admin = 1 AND role != 'admin';`,
    );
  }
}