<?php

namespace app\common\Service;

use app\common\Enum\GoodsEnum;
use app\common\model\Order;
use app\common\model\OrderGoods;
use app\common\model\OrderAction;
use app\common\model\Address;
use app\common\model\UserCoupon;
use app\common\model\Goods;
use app\common\model\Sku;
use app\common\model\Freight;
use app\common\model\Coupon;
use app\common\model\Carts;
use think\Db;
use think\Exception;
use app\common\model\OrderAddress;
/**
 * 订单服务类
 * 封装订单创建相关逻辑
 */
class OrderService
{

        /**
     * 根据商品列表计算订单明细
     * @param array $orderInfo 订单基础信息
     * @param array $goods_list 商品列表
     * @param int $user_id 用户ID
     * @param int $area_id 地区ID
     * @param int $user_coupon_id 优惠券ID
     * @return array
     * @throws Exception
     */
    protected static function computeGoods(&$orderInfo, $goodsList, $userId, $areaId, $userCouponId = 0)
    {
        $config = get_addon_config('shop');
        $orderInfo['amount'] = 0;
        $orderInfo['goods_price'] = 0;
        $orderInfo['goods_num'] = 0;
        $orderInfo['express_fee'] = 0;
        $orderInfo['discount_fee'] = 0;
        $orderInfo['coupon_discount_fee'] = 0;
        $orderInfo['order_amount'] = 0;
        $orderItem = [];
        $shippingTemp = [];
        $userCoupon = null;
        $processedGoodsList = []; // 处理后的商品列表，避免与参数$goodsList冲突
        // 校验优惠券
        if ($userCouponId) {
            $userCouponModel = new UserCoupon();
            $userCoupon = $userCouponModel->checkUserOrUse($userCouponId, $userId);
            $orderInfo['user_coupon_id'] = $userCouponId;
        }

        // 提取所有商品ID和SKU ID，进行批量查询
        $goodsIds = array_column($goodsList, 'goods_id');
        $skuIds = [];
        foreach ($goodsList as $index => $item) {
            if (isset($item['goods_sku_id']) && $item['goods_sku_id'] > 0) {
                $skuIds[] = $item['goods_sku_id'];
            }
        }

        // 批量查询商品信息
        $goodsData = [];
        if (!empty($goodsIds)) {
            $goodsCollection = Goods::with(['brand'])
                ->where('id', 'in', $goodsIds)
                ->where('status', GoodsEnum::STATUS_ON_SALE)
                ->select();
            foreach ($goodsCollection as $goods) {
                $goodsData[$goods->id] = $goods;
            }
        }

        // 批量查询SKU信息
        $skuData = [];
        $multiSpecSkuIds = []; // 用于存储多规格商品的SKU ID
        if (!empty($skuIds)) {
            $skuCollection = Sku::where('id', 'in', $skuIds)->select();
            foreach ($skuCollection as $sku) {               
                $skuData[$sku->id] = $sku;
                // 过滤出有规格值的SKU ID（spec_value_ids不为空）
                if (!empty($sku->spec_value_ids)) {
                    $multiSpecSkuIds[] = $sku->id;
                }
            }
        }
        // 批量查询规格属性字符串（只查询多规格商品的SKU）
        $skuAttrData = [];
        if (!empty($multiSpecSkuIds)) {
            $skuAttrData = \app\common\Service\SkuSpec::getSkuAttrs($multiSpecSkuIds);
        }

        // 验证并构建商品数据
        foreach ($goodsList as $item) {
            $goods_id = $item['goods_id'];
            $goods_sku_id = $item['goods_sku_id']; // 现在所有商品都应该有SKU ID
            $nums = $item['nums'];

            if ($nums <= 0) {
                throw new Exception("商品数量必须大于0");
            }

            // 检查商品是否存在
            if (!isset($goodsData[$goods_id])) {
                throw new Exception("商品已下架");
            }
            $goods = $goodsData[$goods_id];

            // 所有商品都必须有SKU（包括单规格商品的默认SKU）
            if (empty($skuData) || !isset($skuData[$goods_sku_id])) {
                throw new Exception("商品规格不存在");
            }
            $sku = $skuData[$goods_sku_id];
            
            // 验证SKU是否属于该商品
            if ($sku->goods_id != $goods_id) {
                throw new Exception("商品规格不匹配");
            }
            
            // 获取规格属性字符串（单规格商品的sku_attr为空）
            $sku_attr = $skuAttrData[$goods_sku_id] ?? '';

            // 构建商品对象，模拟购物车数据结构
            $goodsItem = (object)[
                'goods_id' => $goods_id,
                'goods_sku_id' => $goods_sku_id,
                'nums' => $nums,
                'goods' => $goods,
                'sku' => $sku,
                'sku_attr' => $sku_attr
            ];

            $processedGoodsList[] = $goodsItem;
        }
    
        // 计算商品价格和运费（统一使用SKU进行计算）
        foreach ($processedGoodsList as $item) {
            $goodsItemData = [];
            
            if (empty($item->goods) || empty($item->sku)) {
                throw new Exception("商品已下架");
            }
            
            // 库存验证（统一使用SKU库存）
            if ($item->sku->stocks < $item->nums) {
                throw new Exception("商品库存不足，请重新修改数量");
            }
            
            // 统一使用SKU数据进行计算
            $goodsItemData['image'] = !empty($item->sku->image) ? $item->sku->image : $item->goods->image;
            $goodsItemData['price'] = $item->sku->price;
            // $goodsItemData['lineation_price'] = $item->sku->lineation_price;
            $goodsItemData['sku_sn'] = $item->sku->sku_sn;
            $amount = bcmul($item->sku->price, $item->nums, 2);
            
            $goodsItemData['amount'] = $amount;
            // 订单应付金额
            $orderInfo['amount'] = bcadd($orderInfo['amount'], $amount, 2);
            // 商品总价
            $orderInfo['goods_price'] = bcadd($orderInfo['goods_price'], $amount, 2);
            // 商品数量累计
            $orderInfo['goods_num'] += $item->nums;

            $freight_id = $item->goods->express_template_id;
            // 计算邮费【合并运费模板】
            if (!isset($shippingTemp[$freight_id])) {
                $shippingTemp[$freight_id] = [
                    'nums'   => $item->nums,
                    'weight' => $item->sku->weight,
                    'amount' => $amount
                ];
            } else {
                $shippingTemp[$freight_id] = [
                    'nums'   => bcadd($shippingTemp[$freight_id]['nums'], $item->nums, 2),
                    'weight' => bcadd($shippingTemp[$freight_id]['weight'], $item->sku->weight, 2),
                    'amount' => bcadd($shippingTemp[$freight_id]['amount'], $amount, 2)
                ];
            }
            
            // 创建订单商品数据 (基于正确的表结构)
            $orderItemData = [
                'user_id'              => $userId,
                'order_sn'             => '', // 将在订单创建后补充
                'goods_sn'             => $item->goods->goods_sn ?: '', // 商品货号
                'sku_sn'               => $item->sku->sku_sn ?: '', // SKU编号
                'goods_type'           => $item->goods->type ?: 0, // 商品类型
                'goods_id'             => $item->goods->id,
                'goods_sku_id'         => $item->sku->id,
                'goods_title'          => $item->goods->title,
                'goods_market_price'   => $item->sku->market_price ?: 0, // 市场价
                'goods_original_price' => $item->sku->price, // 商城售价
                'goods_price'          => $amount, // 实付金额
                'goods_image'          => $goodsItemData['image'],
                'goods_weight'         => $item->sku->weight ?: 0,
                'nums'                 => $item->nums,
                'sale_status'          => 0, // 销售状态:0=待申请
                'comment_status'       => 0, // 评论状态:0=未评论
                'status'               => 1, // 状态
                // 添加分类和品牌信息用于优惠券计算 (临时字段，不会保存到数据库)
                // 'category_id'          => $item->goods->category_ids,
                'brand_id'             => $item->goods->brand_id,
            ];
            
            $orderItem[] = $orderItemData;
        }
    
        // 按运费模板计算
        foreach ($shippingTemp as $key => $item) {
            $shippingfee = Freight::calculate($key, $areaId, $item['nums'], $item['weight'], $item['amount']);
            $orderInfo['express_fee'] = bcadd($orderInfo['express_fee'], $shippingfee, 2);
        }

        // 订单金额(商品价格+运费)
        $orderInfo['order_amount'] = bcadd($orderInfo['goods_price'], $orderInfo['express_fee'], 2);
        // 订单应付金额(暂时等于订单金额，后续会减去优惠)
        $orderInfo['amount'] = $orderInfo['order_amount'];

        // if (!empty($userCoupon)) {
        //     // 校验优惠券
        //     $goods_ids = array_column($orderItem, 'goods_id');
        //     $category_ids = array_column($orderItem, 'category_id');
        //     $brand_ids = array_column($orderItem, 'brand_id');
        //     $couponModel = new Coupon();
        //     $coupon = $couponModel->getCoupon($userCoupon['coupon_id'])
        //         ->checkCoupon()
        //         ->checkOpen()
        //         ->checkUseTime($userCoupon['createtime'])
        //         ->checkConditionGoods($goods_ids, $userId, $category_ids, $brand_ids);

        //     // 计算折扣金额，判断是使用不含运费，还是含运费的金额
        //     $amount = !isset($config['shippingfeecoupon']) || $config['shippingfeecoupon'] == 0 ? $orderInfo['goods_price'] : $orderInfo['order_amount'];
        //     list($new_money, $coupon_money) = $coupon->doBuy($amount);

        //     // 判断优惠金额是否超出总价，超出则直接设定优惠金额为总价
        //     $orderInfo['coupon_discount_fee'] = $coupon_money > $amount ? $amount : $coupon_money;
        //     $orderInfo['discount_fee'] = $orderInfo['coupon_discount_fee'];
        // }

        // 计算最终应付金额【订单金额减去折扣】
        $orderInfo['amount'] = max(0, bcsub($orderInfo['order_amount'], $orderInfo['discount_fee'], 2));
        $orderInfo['pay_amount'] = $orderInfo['amount']; // 实际付款金额等于应付金额
        $orderInfo['discount_fee'] = bcadd($orderInfo['discount_fee'], 0, 2);

        return [
            $orderItem,
            $processedGoodsList,
            $userCoupon
        ];
    }

    
    /**
     * 统一的创建订单方法
     * @param int $address_id 地址ID
     * @param int $user_id 用户ID
     * @param array $goods_list 标准化的商品列表
     * @param int $user_coupon_id 优惠券ID
     * @param string $memo 备注
     * @param array $cart_ids 购物车ID数组（如果是购物车模式需要清空）
     * @return Order
     * @throws Exception
     */
    public static function createOrder($addressId, $userId, $goodsList, $userCouponId = 0, $remark = '')
    {
        $address = Address::get($addressId);
        if (!$address || $address['user_id'] != $userId) {
            throw new Exception("地址未找到");
        }

        if (empty($goodsList)) {
            throw new Exception("商品列表不能为空");
        }

        $config = get_addon_config('shop');
        $orderSn = date("Ymdhis") . sprintf("%08d", $userId) . mt_rand(1000, 9999);

        // 订单主表信息 (基于新表结构)
        $orderInfo = [
            'type'                 => 1, // 1：普通订单
            'source'               => 'H5', // 订单来源 (暂定H5，可根据实际情况调整)
            'order_sn'             => $orderSn,
            'user_id'              => $userId,
            'amount'               => 0, // 订单应付金额
            'goods_price'          => 0, // 商品总费用
            'goods_num'            => 0, // 商品数量
            'discount_fee'         => 0, // 优惠金额
            'coupon_discount_fee'  => 0, // 优惠券金额
            'promo_discount_fee'   => 0, // 营销金额
            'order_amount'         => 0, // 订单金额
            'pay_amount'           => 0, // 实际付款金额
            'pay_type'             => '', // 支付方式
            'pay_time'             => null, // 支付时间
            'delivery_type'        => 1, // 发货方式
            'express_name'         => '', // 快递名称
            'express_no'           => '', // 快递单号
            'express_fee'          => 0, // 配送费用
            'expire_time'          => time() + $config['order_timeout'], // 过期时间
            'order_status'         => \app\common\Enum\OrderEnum::STATUS_CREATE, // 待付款
            'invoice_status'       => 0, // 发票开具状态
            'remark'               => $remark, // 用户备注
            'user_coupon_id'       => $userCouponId ?: null,
            'ip'                   => request()->ip(), // IP地址
            'status'               => 'normal'
        ];
      

        // 通过商品列表计算订单明细
        list($orderItem, $calculatedGoodsList, $userCoupon) = self::computeGoods($orderInfo, $goodsList, $userId, $address->area_id, $userCouponId);
        // 创建订单
        $order = self::createOrderWithTransaction($orderInfo, $orderItem, $calculatedGoodsList, $userCoupon, $address);
        
        return $order;
    }


    /**
     * 在事务中创建订单
     * @param array $orderInfo 订单信息
     * @param array $orderItem 订单商品列表
     * @param array $goodsList 商品列表
     * @param object $userCoupon 优惠券
     * @param object $address 地址信息
     * @return Order
     * @throws Exception
     */
    protected static function createOrderWithTransaction($orderInfo, $orderItem, $goodsList, $userCoupon, $address)
    {
        $order = null;
        Db::startTrans();
        try {
            // 创建订单
            $order = Order::create($orderInfo, true);
            
            // 为每个订单商品添加订单ID和订单号
            foreach ($orderItem as &$item) {
                $item['order_id'] = $order->id;
                $item['order_sn'] = $order->order_sn;
                // 移除临时字段
                unset($item['category_id'], $item['brand_id']);
            }
            unset($item);
            // 创建订单地址信息
            $orderAddressData = [
                'order_id'      => $order->id,
                'user_id'       => $orderInfo['user_id'],
                'consignee'     => $address->receiver,
                'mobile'        => $address->mobile,
                'province_name' => $address->province->name ?? '',
                'city_name'     => $address->city->name ?? '',
                'district_name' => $address->area->name ?? '',
                'address'       => $address->address,
                'province_id'   => $address->province_id,
                'city_id'       => $address->city_id,
                'district_id'   => $address->area_id,
            ];
            OrderAddress::create($orderAddressData);
            
            // 减库存
            foreach ($goodsList as $index => $item) {
                if ($item->sku) {
                    $item->sku->setDec('stocks', $item->nums);
                }
                $item->goods->setDec("stocks", $item->nums);
            }
            
            // 计算单个商品折扣后的价格 (基于新字段名)
            $saleamount = bcsub($order['amount'], $order['express_fee'], 2);
            $saleratio = $order['goods_price'] > 0 ? bcdiv($saleamount, $order['goods_price'], 10) : 1;
            $saleremains = $saleamount;
            
            foreach ($orderItem as $index => &$item) {
                if (!isset($orderItem[$index + 1])) {
                    $saleprice = $saleremains;
                } else {
                    $saleprice = $order['discount_fee'] == 0 ? bcmul($item['goods_original_price'], $item['nums'], 2) : bcmul(bcmul($item['goods_original_price'], $item['nums'], 2), $saleratio, 2);
                }
                $saleremains = bcsub($saleremains, $saleprice, 2);
                $item['goods_price'] = $saleprice;
            }
            unset($item);
            
            // 批量创建订单商品数据
            if (!empty($orderItem)) {
                (new OrderGoods())->saveAll($orderItem);
            }
            
            // 修改地址使用次数
            if ($address) {
                $address->setInc('usednums');
            }
            
            // 优惠券已使用
            if (!empty($userCoupon)) {
                $userCoupon->save(['is_used' => 2]);
            }
            
            // 提交事务
            Db::commit();
        } catch (Exception $e) {
            Db::rollback();
            throw new Exception($e->getMessage());
        }
        
        // 记录操作
        OrderAction::push($orderInfo['order_sn'], '系统', '订单创建成功');
        
        // 订单应付金额为0时直接结算
        if ($order['amount'] == 0) {
            Order::settle($order->order_sn, 0);
            $order = Order::get($order->id);
        }
        
        return $order;
    }

    /**
     * 验证商品规格参数
     * @param array $goods_list 商品列表
     * @throws Exception
     */
    public static function validateGoodsList($goods_list)
    {
        if (empty($goods_list) || !is_array($goods_list)) {
            throw new Exception("商品列表不能为空");
        }

        foreach ($goods_list as $item) {
            if (!isset($item['goods_id']) || !is_numeric($item['goods_id']) || $item['goods_id'] <= 0) {
                throw new Exception("商品ID无效");
            }
            
            if (!isset($item['nums']) || !is_numeric($item['nums']) || $item['nums'] <= 0) {
                throw new Exception("商品数量必须大于0");
            }
            
            if (isset($item['goods_sku_id']) && !is_numeric($item['goods_sku_id'])) {
                throw new Exception("商品规格ID无效");
            }
        }
    }

    /**
     * 统一的订单计算方法（用于预览订单）
     * @param array $goods_list 标准化的商品列表
     * @param int $user_id 用户ID
     * @param int $area_id 地区ID
     * @param int $user_coupon_id 优惠券ID
     * @return array
     * @throws Exception
     */
    public static function calculateOrder($goodsList, $userId, $areaId = 0, $userCouponId = 0)
    {
        if (empty($goodsList)) {
            throw new Exception("商品列表不能为空");
        }
      
        // 验证商品列表格式
        self::validateGoodsList($goodsList);

        // 订单基础信息（用于计算，不包含订单号）
        $orderInfo = [
            'amount'               => 0, // 应付金额
            'goods_price'          => 0, // 商品金额 (不含运费)
            'goods_num'            => 0, // 商品数量
            'discount_fee'         => 0, // 总优惠金额
            'coupon_discount_fee'  => 0, // 优惠券金额
            'promo_discount_fee'   => 0, // 营销金额
            'order_amount'         => 0, // 总金额 (含运费)
            'express_fee'          => 0, // 运费
        ];       

        // 计算商品明细
        list($orderItem, $calculatedGoodsList, $userCoupon) = self::computeGoods($orderInfo, $goodsList, $userId, $areaId, $userCouponId);

        return [
            'orderItem' => $orderItem,
            'goodsList' => $calculatedGoodsList,
            'orderInfo' => $orderInfo,
            'userCoupon' => $userCoupon
        ];
    }

        /**
     * 订单列表
     *
     * @param $param
     * @return \think\Paginator
     */
    public static function getOrderList($userId = 0, $param,$status = [])
    {
        $pageSize = 15;
        if (!empty($param['pageSize'])) {
            $pageSize = $param['pageSize'];
        }
        return Order::with(['orderGoods'])
            ->where(function ($query) use ($param) {

                if (!empty($userId)) {
                    $query->where('user_id', $userId);
                }
               
                if (!empty($status)) {
                    $query->whereIn('order_status', $status );
                }
              
                if (isset($param['keywords']) && $param['keywords'] != '') {
                    $query->where('order_sn', 'in', function ($query) use ($param) {
                        return $query->name('shop_order_goods')->where('order_sn|goods_title', 'like', '%' . $param['q'] . '%')->field('order_sn');
                    });
                }
            })
            ->order('createtime desc')
            ->paginate($pageSize, false, ['query' => request()->get()]);
    }


}