<?php
namespace app\service;

use app\model\Order;
use app\model\OrderItem;
use app\model\Product;
use think\facade\Db;

class OrderService
{
    // 下单事务 (BUG-04: 增加数量校验)
    public function submit(string $cardNo, array $items, string $note = ''): array
    {
        return Db::transaction(function () use ($cardNo, $items, $note) {
            $totalAmount = 0;
            $orderItems = [];

            foreach ($items as $item) {
                // BUG-04: 校验 qty 为正整数
                $qty = intval($item['qty'] ?? 1);
                if ($qty < 1 || $qty > 99) {
                    throw new \Exception('商品数量不合法');
                }

                $product = Product::find($item['productId']);
                if (!$product || $product->status != 1) {
                    throw new \Exception('商品不存在或已下架');
                }
                $subtotal = $product->price * $qty;
                $totalAmount += $subtotal;
                $orderItems[] = [
                    'product_id'   => $product->id,
                    'product_name' => $product->name,
                    'emoji'        => $product->emoji ?? '',
                    'price'        => $product->price,
                    'quantity'     => $qty,
                ];
            }

            if ($totalAmount <= 0) {
                throw new \Exception('订单金额无效');
            }

            // BUG-03 (旧): 订单号增加秒级精度避免并发冲突
            $orderNo = 'OD' . date('His') . substr($cardNo, -3) . rand(10, 99);

            $order = Order::create([
                'order_no'     => $orderNo,
                'card_no'      => $cardNo,
                'total_amount' => $totalAmount,
                'status'       => 0,
                'note'         => $note,
                'submitted_at' => date('Y-m-d H:i:s'),
            ]);

            foreach ($orderItems as &$oi) {
                $oi['order_id'] = $order->id;
            }
            (new OrderItem())->saveAll($orderItems);

            return ['orderNo' => $order->order_no];
        });
    }

    // 顾客订单列表
    public function listByCard(string $cardNo): array
    {
        $orders = Order::with('items')
            ->where('card_no', $cardNo)
            ->order('submitted_at', 'desc')
            ->select()
            ->toArray();

        return array_map(function ($o) {
            return [
                'id'            => $o['id'],
                'orderNo'       => $o['order_no'],
                'cardNo'        => $o['card_no'],
                'status'        => $o['status'],
                'note'          => $o['note'] ?? '',
                'remindCount'   => $o['remind_count'] ?? 0,
                'submittedAt'   => date('H:i', strtotime($o['submitted_at'])),
                'items'         => array_map(function ($i) {
                    return [
                        'name'  => $i['product_name'],
                        'emoji' => $i['emoji'] ?? '',
                        'alc'   => 0.0,
                        'qty'   => $i['quantity'],
                    ];
                }, $o['items'] ?? []),
            ];
        }, $orders);
    }

    // BUG-01: 催单增加归属校验 + 状态校验 + 频率限制
    public function remind(int $orderId, string $cardNo): void
    {
        $order = Order::find($orderId);
        if (!$order) {
            throw new \Exception('订单不存在');
        }
        // 归属校验
        if ($order->card_no !== $cardNo) {
            throw new \Exception('无权操作此订单');
        }
        // 状态校验：仅新单可催
        if ($order->status !== 0) {
            throw new \Exception('当前订单状态不可催单');
        }
        // 频率限制：30秒冷却
        $lastRemind = strtotime($order->updated_at ?? $order->submitted_at);
        if (time() - $lastRemind < 30) {
            throw new \Exception('催单太频繁，请30秒后再试');
        }
        // 上限：最多5次
        if ($order->remind_count >= 5) {
            throw new \Exception('催单次数已达上限');
        }

        Order::where('id', $orderId)->inc('remind_count', 1)->update();
    }
}