import {
  controllerStrongholdTarget,
  physicalControllerCount,
  type TwoPlayerControllers,
} from './two-player-controllers';

/** GF9's shorter alliance target, also used by the staged three-member and
 * unlimited variants. The two-person four-stronghold rule still applies, as
 * do ordinary solo targets. Callers add any agreed increase afterward. */
export function allianceVictoryTarget(
  seats: readonly string[],
  controllers: TwoPlayerControllers | null | undefined,
  allied: boolean,
  shortAlliance?: boolean,
): 3 | 4 {
  if (shortAlliance !== undefined && typeof shortAlliance !== 'boolean')
    throw new TypeError('Choose whether the shorter alliance victory option is enabled.');
  const target = controllerStrongholdTarget(seats, controllers, allied);
  if (shortAlliance === true && allied && physicalControllerCount(seats, controllers) >= 3)
    return 3;
  return target;
}