import assert from "node:assert/strict";
import { execFile } from "node:child_process";
import { promisify } from "node:util";

const execute = promisify(execFile);

export function latch() {
  let release: () => void = () => {
    throw new Error("Barrera sin inicializar.");
  };

  const promise = new Promise<void>((resolve) => {
    release = resolve;
  });

  return { promise, release };
}

export async function waitBarrier(promise: Promise<void>) {
  let timer: NodeJS.Timeout | undefined;

  try {
    await Promise.race([
      promise,
      new Promise<never>((_resolve, reject) => {
        timer = setTimeout(
          () => reject(new Error("No se alcanzó la barrera transaccional.")),
          15000
        );
      }),
    ]);
  } finally {
    clearTimeout(timer);
  }
}

/** Observa una espera real de InnoDB fuera del pool probado; no vuelca credenciales del contenedor. */
export async function waitCatalogLock(container: string) {
  assert.match(container, /^metis-scope-test-[a-f0-9]+$/u);
  const deadline = Date.now() + 10000;

  while (Date.now() < deadline) {
    const { stdout } = await execute(
      "docker",
      [
        "exec",
        container,
        "sh",
        "-c",
        'MYSQL_PWD="$MARIADB_ROOT_PASSWORD" mariadb -uroot -N -B --execute="SELECT COUNT(*) FROM information_schema.INNODB_LOCK_WAITS w JOIN information_schema.INNODB_LOCKS b ON b.lock_id=w.blocking_lock_id WHERE b.lock_table LIKE \'%resource_catalogs%\'"',
      ],
      { timeout: 5000 }
    );

    if (Number(stdout.trim()) > 0) {
      return;
    }
    await new Promise<void>((resolve) => setImmediate(resolve));
  }
  throw new Error("No se observó la espera de InnoDB esperada.");
}