餐饮预约点餐系统怎么做？从0到1搭建思路（含代码示例）

const OrderStatus = {
  CREATED: "created",        // 已创建
  PAID: "paid",              // 已支付
  RESERVED: "reserved",      // 已预约
  PREPARING: "preparing",    // 制作中
  READY: "ready",            // 已出餐
  DELIVERING: "delivering",  // 配送中
  COMPLETED: "completed",    // 已完成
  CANCELED: "canceled"       // 已取消
};

const OrderType = {
  DINE_IN: "dine_in",   // 到店预约
  DELIVERY: "delivery"   // 外卖配送
};

const order = {
  orderId: "ORD123456",
  userId: "U10001",
  shopId: "S20001",
  type: OrderType.DELIVERY, // 或 dine_in

  items: [
    {
      productId: "P001",
      name: "牛肉饭",
      price: 28,
      quantity: 2
    }
  ],

  totalAmount: 56,

  reservationTime: null, // 到店预约才有
  address: null,         // 外卖才有

  status: OrderStatus.CREATED,
  createdAt: Date.now()
};

app.post("/order/create", async (req, res) => {
  const { userId, shopId, items, type, reservationTime, address } = req.body;

  const totalAmount = items.reduce((sum, item) => {
    return sum + item.price * item.quantity;
  }, 0);

  const order = {
    orderId: generateOrderId(),
    userId,
    shopId,
    items,
    type,
    reservationTime: type === "dine_in" ? reservationTime : null,
    address: type === "delivery" ? address : null,
    totalAmount,
    status: "created",
    createdAt: Date.now()
  };

  await db.order.insert(order);

  res.json({
    success: true,
    data: order
  });
});

app.post("/payment/callback", async (req, res) => {
  const { orderId, payStatus } = req.body;

  if (payStatus === "success") {
    await db.order.update(orderId, {
      status: "paid"
    });
  }

  res.send("ok");
});

app.post("/order/accept", async (req, res) => {
  const { orderId } = req.body;

  await db.order.update(orderId, {
    status: "preparing"
  });

  res.json({ success: true });
});

app.post("/order/ready", async (req, res) => {
  const { orderId } = req.body;

  await db.order.update(orderId, {
    status: "ready"
  });

  res.json({ success: true });
});

app.post("/order/deliver", async (req, res) => {
  const { orderId } = req.body;

  await db.order.update(orderId, {
    status: "delivering"
  });

  res.json({ success: true });
});

function checkReservation(shopId, timeSlot) {
  const count = db.order.count({
    shopId,
    reservationTime: timeSlot,
    status: { $in: ["reserved", "paid", "preparing"] }
  });

  return count < MAX_TABLE_LIMIT;
}

if (type === "dine_in") {
  const available = checkReservation(shopId, reservationTime);

  if (!available) {
    throw new Error("该时间段已满");
  }
}

function submitOrder() {
  const orderType = this.type; // delivery / dine_in

  const payload = {
    items: this.cart,
    type: orderType
  };

  if (orderType === "delivery") {
    payload.address = this.address;
  }

  if (orderType === "dine_in") {
    payload.reservationTime = this.timeSlot;
  }

  api.createOrder(payload).then(res => {
    console.log("下单成功", res);
  });
}

创建订单
   ↓
支付成功
   ↓
商家接单
   ↓
制作中
   ↓
（外卖）配送中 / （预约）等待到店
   ↓
完成