screen/application/api/controller/mall/GoodsCart.php

<?php

namespace app\api\controller\mall;

use app\common\controller\Api;
use app\common\model\Coupon;
use app\common\model\GoodsSku;
use app\common\service\CouponService;
use app\common\service\InstallService;
use think\Db;

/**
 * 商城购物车
 * @inheritdoc
 */
class GoodsCart extends Api
{
    protected $noNeedRight="*";
    /**
     * 添加到购物车
     * @ApiMethod (POST)
     * @ApiSummary ("参数：{sku_id:{num:1,num_install:2}}，sku_id规格id，num数量，num_install安装数量")
     */
    public function add(){
        $user=$this->auth->getUser();
        $data=input();
        $goods=$data['goods']??[];
        foreach ($goods as $sku=>$good){
            GoodsSku::findOrFail($sku);
            $good['sku_id']=$sku;
            $this->validate($good,[
                'sku_id|规格'=>['require','integer','gt:0'],
                'num|数量'=>['require','integer','gt:0'],
                'num_install|安装'=>['require','integer','gt:0'],
            ]);
        }
        Db::startTrans();
        $skus=GoodsSku::whereIn('id',array_keys($goods))->lock(true)->select();
        foreach ($skus as $sku){
            if($sku['num_sell']+$goods[$sku['id']]['num']>$sku['num_stock']){
                $this->error('库存不足');
            }
            $cart=$user->cart()->where('goods_sku_id',$sku['id'])->find();
            if($cart){
                $cart['num']=$cart['num']+$goods[$sku['id']]['num'];
                $cart['num_install']=$cart['num_install']+$goods[$sku['id']]['num_install'];
                $cart->save();
            }else{
                $user->cart()->save([
                    'goods_sku_id'=>$sku['id'],
                    'goods_id'=>$sku['goods_id'],
                    'num'=>$goods[$sku['id']]['num'],
                    'num_install'=>$goods[$sku['id']]['num_install'],
                ]);
            }
            $sku->save();
        }
        Db::commit();
        $this->success();
    }
    /**
     * 删除
     * @ApiParams (name=id,description=购物车id)
     */
    public function del(){
        $data=$this->_validate([
            'id'=>['require'],
        ]);
        $user=$this->auth->getUser();
        $user->cart()->where('id',$data['id'])->delete();
        $this->success();
    }
    /**
     * 购物车修改
     * @ApiParams (name=id,description=购物车id)
     * @ApiParams (name=num,description=购买数量)
     * @ApiParams (name=num_install,description=安装数量)
     */
    public function update(){
        $data=$this->_validate([
            'id'=>['require'],
            'num|数量'=>['integer','gt:0'],
            'num_install|数量'=>['integer','gt:0'],
        ]);
        $user=$this->auth->getUser();
        $cart=$user->cart()->findOrFail($data['id']);
        if(!empty($data['num'])){
            $cart['num']=$data['num'];
        }
        if(!empty($data['num_install'])){
            $cart['num_install']=$data['num_install'];
        }
        $cart->save();
        $this->success();
    }

    /**
     * 购物车列表
     * @ApiParams (name=coupon_use,description="是否使用优惠券使用传1")
     * @ApiParams (name=coupon_id,description=优惠券id)
     * @ApiReturnParams (name=amount_total,description=总金额)
     * @ApiReturnParams (name=amount_coupon,description=优惠券优惠金额)
     * @ApiReturnParams (name=amount_install,description=安装费)
     * @ApiReturnParams (name=num,description=购买件数)
     * @ApiReturnParams (name=num_install,description=安装件数)
     * @ApiReturnParams (name=goods,description=商品列表)
     */
    public function index(){
        $data=$this->_validate([
            'coupon_id|优惠券'=>['integer','requireIf:coupon_use,1'],
        ]);
        $user=$this->auth->getUser();
        $info=[
            'amount_total'=>0,
            'amount_coupon'=>0,
            'amount_install'=>0,
            'num'=>0,
            'num_install'=>0,
            'goods'=>[]
        ];

        $info['goods']=$user->cart()
            ->with(['goods','sku'])
            ->select()->toArray();
        $info['num']=array_sum(array_column($info['goods'],'num'));
        $info['num_install']=array_sum(array_column($info['goods'],'num_install'));

        foreach ($info['goods'] as $goods){
            $amount=bcmul($goods['sku']['amount'],$goods['num']);
            $info['amount_total']=bcadd($info['amount_total'],$amount);
        }

        #安装费
        $info['amount_install']=InstallService::getFee(array_column($info['goods'],null,'goods_sku_id'),'num_install');
        $info['amount_total']=bcadd($info['amount_total'],$info['amount_install']);

        #优惠券
        $couponAmount=0;
        if(!empty($data['coupon_use'])){
            $use=false;
            $coupon=$user->coupon()->findOrFail($data['coupon_id']);
            foreach ($info['goods'] as $goods){
                $amount=bcmul($goods['sku']['amount'],$goods['num']);
                if($coupon->canUse($amount,$goods['goods_id'])){
                    $use=true;
                    $couponAmount=$coupon['amount'];
                    break;
                }
            }

            if(!$use){
                $this->error('优惠券不符合使用规则');
            }
            $info['amount_coupon']=$couponAmount;
        }
        $info['amount_total']=bcsub($info['amount_total'],$couponAmount);

        $this->success('',$info);
    }
}