Get water from water dispenser

get-water-from-water-dispenser.ts

type WaterVolume = number;

interface IPerson {
  id: number; // 人员标识
  competent: boolean; // 是否有能力换水
  altruistic: boolean; // 是否乐于助人
}

// 所有员工
const staffs: IPerson[] = [];

/**
 * 饮水机剩余水量
 */
function getRemainWaterOfDispenser(): WaterVolume {
  return 0;
}

/**
 * 重装水桶
 *
 * @param person 换水人
 */
function reloadWaterBucket(person: IPerson): boolean {
  return true;
}

/**
 * 从饮水机接水
 *
 * @param person 接水人
 * @param need 需要接的水量
 */
function getWaterFromDispenser(person: IPerson, need: WaterVolume): boolean {
  const remainNeed = need - getRemainWaterOfDispenser();

  if (remainNeed < 0 || (remainNeed === 0 && (!person.competent || !person.altruistic))) {
    return true;
  }

  if (remainNeed === 0 || person.competent) {
    return reloadWaterBucket(person);
  }

  const helper = staffs.find((s: IPerson): boolean => s.id !== person.id && s.altruistic && s.competent);

  if (!helper) {
    throw new Error('没水喝，渴着吧！');
  }

  return reloadWaterBucket(helper);
}