校园跑腿小程序定制：代取、代买、代送的状态机与验收清单

type ServiceType = 'pickup' | 'buy' | 'deliver';

interface TaskBase {
  id: string;
  type: ServiceType;
  campusId: string;
  buildingId: string;
  dropoff: string;
  scheduledAt?: string;
}

interface PickupTask extends TaskBase {
  type: 'pickup';
  pickupPoint: string;
  pickupCode: string;
  parcelCount: number;
}

interface BuyTask extends TaskBase {
  type: 'buy';
  itemList: string[];
  budgetCents: number;
  advancePayment: boolean;
}

interface DeliverTask extends TaskBase {
  type: 'deliver';
  itemDesc: string;
  forbiddenCheck: boolean;
}

type Task = PickupTask | BuyTask | DeliverTask;

function validateTask(t: Task): string[] {
  const errors: string[] = [];
  if (!t.campusId) errors.push('缺少校区');
  if (!t.buildingId) errors.push('缺少送达楼栋');
  if (!t.dropoff) errors.push('缺少送达点');
  if (t.scheduledAt && Number.isNaN(Date.parse(t.scheduledAt))) {
    errors.push('预约时间格式不正确');
  }
  if (t.type === 'pickup') {
    if (!t.pickupPoint) errors.push('代取缺少取件点');
    if (!t.pickupCode) errors.push('代取缺少取件码');
    if (t.parcelCount < 1) errors.push('代取件数必须大于0');
  }
  if (t.type === 'buy') {
    if (t.itemList.length === 0) errors.push('代买至少填写一项商品');
    if (t.budgetCents <= 0) errors.push('预算必须大于0');
  }
  if (t.type === 'deliver') {
    if (!t.itemDesc) errors.push('代送缺少物品说明');
    if (!t.forbiddenCheck) errors.push('代送需确认禁运提示');
  }
  return errors;
}

const ok = validateTask({
  id: 'T-1001',
  type: 'pickup',
  campusId: 'C-01',
  buildingId: 'B-12',
  pickupPoint: '东门快递点',
  pickupCode: 'A-1234',
  parcelCount: 2,
  dropoff: '12栋楼下取餐点',
  scheduledAt: '2026-09-01T12:10:00+08:00'
});
console.log(ok); // 预期：[]

const bad = validateTask({
  id: 'T-1002',
  type: 'buy',
  campusId: 'C-01',
  buildingId: 'B-12',
  dropoff: '12栋楼下取餐点',
  itemList: [],
  budgetCents: 0,
  advancePayment: true
});
console.log(bad); // 预期：包含代买商品和预算相关错误