// 蝦皮 API 簽名生成
const crypto = require('crypto');

const partnerId = 'your_partner_id';
const partnerKey = 'your_partner_key';
const timestamp = Math.floor(Date.now() / 1000);
const path = '/api/v2/order/get_order_list';

const baseString = `${partnerId}${path}${timestamp}`;
const sign = crypto.createHmac('sha256', partnerKey)
  .update(baseString)
  .digest('hex');

// 統一訂單資料格式
const input = $input.first().json;
let order = {};

// 判斷來源平台
if (input.id && input.line_items) {
  // Shopify 格式
  order = {
    platform: 'shopify',
    orderId: input.id.toString(),
    orderNumber: input.order_number || input.name,
    customerName: `${input.customer?.last_name || ''}${input.customer?.first_name || ''}`.trim() || '顧客',
    customerEmail: input.email,
    customerPhone: input.customer?.phone || input.shipping_address?.phone,
    totalAmount: parseFloat(input.total_price),
    currency: input.currency || 'TWD',
    status: input.fulfillment_status || 'unfulfilled',
    paymentStatus: input.financial_status,
    shippingAddress: [
      input.shipping_address?.address1,
      input.shipping_address?.city,
      input.shipping_address?.zip
    ].filter(Boolean).join(' '),
    items: input.line_items.map(item => ({
      name: item.title,
      quantity: item.quantity,
      price: parseFloat(item.price)
    })),
    createdAt: input.created_at
  };
} else if (input.order_id && input.order_sn) {
  // 蝦皮格式
  order = {
    platform: 'shopee',
    orderId: input.order_sn,
    orderNumber: input.order_sn,
    customerName: input.recipient_address?.name || '顧客',
    customerPhone: input.recipient_address?.phone,
    totalAmount: input.total_amount / 100000, // 蝦皮金額單位轉換
    currency: 'TWD',
    status: input.order_status,
    shippingAddress: input.recipient_address?.full_address,
    items: input.item_list?.map(item => ({
      name: item.item_name,
      quantity: item.model_quantity_purchased,
      price: item.model_discounted_price / 100000
    })) || [],
    createdAt: new Date(input.create_time * 1000).toISOString()
  };
} else if (input.id && input.billing) {
  // WooCommerce 格式
  order = {
    platform: 'woocommerce',
    orderId: input.id.toString(),
    orderNumber: input.number,
    customerName: `${input.billing.last_name}${input.billing.first_name}`,
    customerEmail: input.billing.email,
    customerPhone: input.billing.phone,
    totalAmount: parseFloat(input.total),
    currency: input.currency,
    status: input.status,
    shippingAddress: [
      input.shipping.address_1,
      input.shipping.city,
      input.shipping.postcode
    ].filter(Boolean).join(' '),
    items: input.line_items.map(item => ({
      name: item.name,
      quantity: item.quantity,
      price: parseFloat(item.price)
    })),
    createdAt: input.date_created
  };
}

// 計算商品清單文字
order.itemsText = order.items
  .map(item => `• ${item.name} x ${item.quantity} - NT$ ${item.price * item.quantity}`)
  .join('\n');

return [{ json: order }];

const message = `
🛒 新訂單通知

📦 訂單編號：${$json.orderNumber}
👤 客戶：${$json.customerName}
📱 電話：${$json.customerPhone}
💰 金額：NT$ ${$json.totalAmount}

📝 商品明細：
${$json.itemsText}

📍 寄送地址：
${$json.shippingAddress}

⏰ 下單時間：${new Date($json.createdAt).toLocaleString('zh-TW')}
`;

return [{ json: { message } }];

// 使用 n8n 的 Wait 節點延遲 3 天
// 或使用排程任務檢查已完成訂單

const message = `
親愛的 ${$json.customerName} 您好：

感謝您購買我們的商品！🙏

您的訂單 ${$json.orderNumber} 已經送達，希望您對商品感到滿意。

如果方便的話，能否花 1 分鐘給我們一個評價呢？
您的回饋對我們非常重要！

👉 點此評價：${$json.reviewUrl}

再次感謝您的支持！
${$json.storeName} 團隊敬上
`;

// 檢查庫存
const lowStockItems = [];

for (const item of $json.items) {
  const stock = await checkStock(item.sku);
  if (stock < 10) {
    lowStockItems.push({
      name: item.name,
      sku: item.sku,
      currentStock: stock
    });
  }
}

if (lowStockItems.length > 0) {
  return [{
    json: {
      alert: true,
      message: `⚠️ 庫存警報：以下商品庫存不足\n${lowStockItems.map(i => `• ${i.name} (${i.sku}): 剩餘 ${i.currentStock} 件`).join('\n')}`
    }
  }];
}

// 判斷是否為 VIP 客戶
const vipCustomers = ['[email protected]', '[email protected]'];
const isVIP = vipCustomers.includes($json.customerEmail);

if (isVIP) {
  // VIP 專屬處理
  return [{
    json: {
      ...$json,
      isVIP: true,
      priority: 'high',
      notificationTemplate: 'vip'
    }
  }];
}

// 異常訂單偵測規則
const alerts = [];

// 規則 1：金額異常高
if ($json.totalAmount > 50000) {
  alerts.push('高金額訂單');
}

// 規則 2：同一客戶短時間內多筆訂單
const recentOrders = await getRecentOrdersByEmail($json.customerEmail, 24);
if (recentOrders.length > 5) {
  alerts.push('短時間內多筆訂單');
}

// 規則 3：寄送地址與帳單地址不同
if ($json.shippingAddress !== $json.billingAddress) {
  alerts.push('寄送地址與帳單地址不同');
}

if (alerts.length > 0) {
  return [{
    json: {
      ...$json,
      isAbnormal: true,
      alerts: alerts
    }
  }];
}

const processedOrders = new Set();

if (processedOrders.has($json.orderId)) {
  return []; // 跳過重複訂單
}

processedOrders.add($json.orderId);

// 主要管道：LINE
try {
  await sendLineNotification($json);
} catch (error) {
  // 備用管道：Email
  await sendEmailNotification($json);
  // 記錄錯誤
  await logError('LINE notification failed', error);
}