<?php

namespace app\common\service\app\physical;

use app\admin\model\app\physical\SkuPrice as SkuPriceModel;
use app\admin\model\app\physical\Goods as GoodsModel;
use think\Db;

/**
 * 库存服务类
 */
class StockSale
{
    /**
     * 下单锁定库存
     *
     * @param array $buyInfo
     * @return void
     */
    public function stockLock($buyInfo)
    {
        $goods = $buyInfo['goods'];
        $goods_sku_price_id = $buyInfo['goods_sku_price_id'];
        $buy_num = $buyInfo['goods_num'] ?? 1;

        $buyInfo['goods_num'] = intval($buy_num) < 1 ? 1 : intval($buy_num);

        $skuPrice = SkuPriceModel::where('id', $goods_sku_price_id)
            ->where('uniacid', UNIACID)
            ->where('status', 1)
            ->lock(true)
            ->value('stock');

        if ($skuPrice < $buyInfo['goods_num']) {
            throw new \Exception('商品 ' . $goods['title'] . ' 库存不足');
        }
    }

    /**
     * 下单成功扣减库存
     *
     * @param array $orderItems
     * @return void
     */
    public function forwardStockSale($orderItems)
    {
        foreach ($orderItems as $item) {
            $snapshoot = $item['snapshoot'] ?? [];
            $goods_num = $item['count'] ?? 1;

            $goodsId = $snapshoot['id'] ?? 0;
            $specType = $snapshoot['spec_type'] ?? 'single';

            $skuPriceQuery = SkuPriceModel::where('goods_id', $goodsId)
                ->where('uniacid', UNIACID);

            if ($specType == 'single') {
                $skuPrice = $skuPriceQuery->order('id', 'asc')->find();
            } else {
                $skuPrice = $skuPriceQuery->where('goods_sku_text', $snapshoot['sku_text'] ?? '')->find();
            }

            if ($skuPrice) {
                // 减少规格库存
                SkuPriceModel::where('id', $skuPrice['id'])
                    ->where('uniacid', UNIACID)
                    ->setDec('stock', $goods_num);

                // 增加规格销量
                SkuPriceModel::where('id', $skuPrice['id'])
                    ->where('uniacid', UNIACID)
                    ->setInc('sales', $goods_num);

                // 增加商品总销量
                GoodsModel::where('id', $goodsId)
                    ->where('uniacid', UNIACID)
                    ->setInc('total_sales', $goods_num);

                // 同步更新商品库存
                $this->updateGoodsStock($goodsId, $specType);
            }
        }
    }

    /**
     * 订单退款返还库存
     *
     * @param array $orderItems
     * @return void
     */
    public function backStockSale($orderItems)
    {
        foreach ($orderItems as $item) {
            $snapshoot = $item['snapshoot'] ?? [];
            $goods_num = $item['count'] ?? 1;

            $goodsId = $snapshoot['id'] ?? 0;
            $specType = $snapshoot['spec_type'] ?? 'single';

            $skuPriceQuery = SkuPriceModel::where('goods_id', $goodsId)
                ->where('uniacid', UNIACID);

            if ($specType == 'single') {
                $skuPrice = $skuPriceQuery->order('id', 'asc')->find();
            } else {
                $skuPrice = $skuPriceQuery->where('goods_sku_text', $snapshoot['sku_text'] ?? '')->find();
            }

            if ($skuPrice) {
                // 返还规格库存
                SkuPriceModel::where('id', $skuPrice['id'])
                    ->where('uniacid', UNIACID)
                    ->setInc('stock', $goods_num);

                // 减少规格销量
                SkuPriceModel::where('id', $skuPrice['id'])
                    ->where('uniacid', UNIACID)
                    ->setDec('sales', $goods_num);

                // 减少商品总销量
                GoodsModel::where('id', $goodsId)
                    ->where('uniacid', UNIACID)
                    ->setDec('total_sales', $goods_num);

                // 同步更新商品库存
                $this->updateGoodsStock($goodsId, $specType);
            }
        }
    }

    /**
     * 更新商品库存
     * 单规格：取单一库存（status=1）
     * 多规格：取所有规格库存之和（status=1）
     * @param int $goodsId 商品ID
     * @param string $specType 规格类型：single=单规格，multi=多规格
     */
    protected function updateGoodsStock($goodsId, $specType = 'single')
    {
        $stock = 0;

        if ($specType == 'single') {
            $skuPrice = SkuPriceModel::where('goods_id', $goodsId)
                ->where('uniacid', UNIACID)
                ->where('status', 1)
                ->order('id', 'asc')
                ->find();
            
            if ($skuPrice) {
                $stock = $skuPrice['stock'] ?? 0;
            }
        } else {
            $totalStock = SkuPriceModel::where('goods_id', $goodsId)
                ->where('uniacid', UNIACID)
                ->where('status', 1)
                ->sum('stock');
            
            $stock = $totalStock ?? 0;
        }

        GoodsModel::where('id', $goodsId)->update([
            'stock' => $stock
        ]);
    }
}