<?php


namespace App\Servers;


use App\Models\Goods;
use App\Models\GoodsSku;
use App\Models\GoodsSpec;
use App\Models\Shopping;
use App\Models\ShoppingDetail;
use Illuminate\Support\Facades\DB;

/**
 * 购物车服务
 */
class ShoppingCartServer
{

    static private $server = null;


    private $errorMsg = '';

    private function __construct()
    {

    }

    /**
     * 创建对象
     * @return ShoppingCartServer
     */
    static function creatServer()
    {
        if (empty(self::$server)) self::$server = new ShoppingCartServer();
        return self::$server;
    }


    /**
     * 获取购物车列表
     * @param $m_id
     * @param $shop_id
     * @return array
     */
    function getShoppingList($m_id,$shop_id)
    {
        //获取购物车商品数据
        $where = [['p.m_id',$m_id], ['p.shop_id',$shop_id], ['g.is_del',0], ['g.status',1]];
        $shopping =  Shopping::from('shopping as p')
            ->leftJoin('goods as g','g.id','=','p.goods_id')
            ->where($where)
            ->select(['p.id as shopping_id','p.number','g.id as goods_id','g.shop_id','g.goods_name','g.goods_image','g.price','g.spec_type','g.category_id','g.pack_price'])
            ->orderBy('p.id','asc')
            ->get();

        $total_num = 0;//总商品数
        $total_goods_money = '0.00';//总商品费用
        $total_pack_price = 0;//打包费
        $goods_list = [];//商品列表

        foreach ($shopping as $value){
            $goods_id = $value->{'goods_id'};//商品id
            $goods_price = $value->{'price'};//商品金额
            $goods_spec_price = 0;//商品规格金额
            $spec_type = $value->{'spec_type'};//商品类型
            $status_str = '';
            $goods_attr = "";//规则值
            $goods_number = $value['number'];//商品数量
            $goods_spec_list = [];//商品所选规格信息

            if ($spec_type == 2){//存在规格
                $details = ShoppingDetail::from('shopping_details as d')
                    ->leftJoin('goods_spec as s','s.id','=','d.goods_spec_id')
                    ->where('d.shopping_id',$value->{'shopping_id'})
                    ->where('d.goods_id',$value->{'goods_id'})
                    ->where('s.is_del',0)
                    ->select(['d.id','d.goods_id','d.goods_spec_id','d.number','s.spec_name','s.spec_price'])
                    ->get();
                foreach ($details as $detail){
                    if ($detail->{'number'} > 1){
                        $goods_attr .= $detail['spec_name'].'x'.$detail->{'number'} . ',';
                    }else{
                        $goods_attr .= $detail['spec_name'] . ',';
                    }
                    $goods_spec_price =  bcadd($goods_spec_price,bcmul($detail['number'],$detail['spec_price'],2),2);//规格数量乘以价格等于 规格总价
                }
                $goods_spec_list = $details;
            }
            //计算价格
            $goods_money = bcmul($goods_number,bcadd($goods_price,$goods_spec_price,2),2);//商品价格等于 商品数量X（商品底价+商品规格总价）


            $goods_list[] = [
                'shop_id' => $value['shop_id'],
                'category_id' => $value['category_id'],
                'goods_id' => $goods_id,
                'goods_money' => rtrim(rtrim($goods_money, '0'),'.'),
                'goods_number' => $goods_number,
                'goods_name' => $value['goods_name'],
                'goods_image' => $value['goods_image'],
                'spec_type' => $value['spec_type'],
                'price' => $goods_price,
                'pack_price' => $value['pack_price'],
                'goods_attr' => $goods_attr,
                'status_str' => $status_str,
                'spec_list' => $goods_spec_list,
            ];
            //计算打包费
            $total_pack_price = bcadd($total_pack_price,bcmul($goods_number,$value['pack_price'],2),2);
            //计算总数量
            $total_num += $goods_number;
            //计算总商品费用
            $total_goods_money = bcadd($total_goods_money,$goods_money,2);
        }
        //订单总价-商品总价+总包装费
        $total_price = bcadd($total_goods_money,$total_pack_price,2);

        $data['total_price'] = rtrim(rtrim($total_price, '0'),'.');
        $data['total_num'] = (int)$total_num;
        $data['total_goods_money'] = rtrim(rtrim($total_goods_money, '0'),'.');
        $data['pack_price'] = $total_pack_price;
        $data['err_msg'] = $this->errorMsg;
        $data['goods_list'] = $goods_list;

        $this->errorMsg = '';

        return $data;
    }

    /**
     * 添加购物车
     * @param $m_id
     * @param $shop_id
     * @param $category_id
     * @param $goods_id
     * @param $goods_spec_id
     * @param $number
     * @return array
     */
    function saveShopping($m_id,$shop_id,$category_id,$goods_id,$goods_spec_id,$number)
    {
        if (empty($goods_spec_id)){
            $goods_spec_id = '';
        }
        //获取商品
        $goods = Goods::where('is_del',0)
            ->where('id',$goods_id)
            ->where('shop_id',$shop_id)
            ->where('category_id',$category_id)
            ->select(['id as goods_id','status','spec_type'])
            ->first();
        if (empty($goods)) return ['code' => 0, 'msg' => '当前商品不存在'];
        if ($goods->{'status'} != 1) return ['code' => 0, 'msg' => '当前商品已下架'];
        //如果是单规格但是选择了规格
        if ($goods->{'spec_type'} == 1 && !empty($goods_spec_id)){
            return ['code' => 0, 'msg' => '该商品没有规格'];
        }
        if (!empty($goods_spec_id)){
            $sku_id = GoodsSpec::where('goods_id',$goods_id)->where('id',$goods_spec_id)->where('is_del',0)->value('sku_id');
            if (empty($sku_id)){
                return ['code' => 0, 'msg' => '商品规格错误'];
            }
            $skuInfo = GoodsSku::where('goods_id',$goods_id)->where('id',$sku_id)->where('is_del',0)->first();
            if (empty($skuInfo)){
                return ['code' => 0, 'msg' => '商品规格不存在'];
            }
        }
        DB::beginTransaction();
        try {
            //获取购物车是否存在此商品
            $where = [['m_id',$m_id], ['shop_id',$shop_id], ['category_id',$category_id], ['goods_id',$goods_id]];
            //查询此商品购物车数量
            $shopping_info = Shopping::where($where)->select(['id', 'goods_id', 'number'])->first();

            if (empty($shopping_info)) {//没用购物车信息
                //如果商品是多规格但是没选规格
                if ($goods->{'spec_type'} == 2 && empty($goods_spec_id)){
                    return ['code' => 0, 'msg' => '请选择商品规格'];
                }
                if ($number <= 0){
                    DB::rollBack();
                    return ['code' => 0, 'msg' => '请选择数量'];
                }
                //入库
                $shopping = Shopping::create([
                    'm_id' => $m_id,
                    'shop_id' => $shop_id,
                    'category_id' => $category_id,
                    'goods_id' => $goods_id,
                    'number' => $number,
                ]);
                $shopping_id = $shopping->{'id'};
                if (empty($shopping_id)) {
                    DB::rollBack();
                    return ['code' => 0, 'msg' => '添加失败'];
                }
                //如果有规则就入库规则信息
                if (!empty($goods_spec_id)){
                    if ($skuInfo->{'sku_type'} == 1){//商品只能单选
                        $number = 1;//单选购物数量只能为1
                    }elseif ($skuInfo->{'sku_type'} == 2 && $skuInfo->{'affect_quantity'} == 0){//可多选规格但是不能多添加购物车数量
                        $number = 1;//数量只能为1
                    }
                    ShoppingDetail::create([
                        'shopping_id' => $shopping_id,
                        'goods_id' => $goods_id,
                        'goods_spec_id' => $goods_spec_id,
                        'number' => $number,
                    ]);
                }
            }else{//有购物车信息，更新
                $shopping_id = $shopping_info->{'id'};

                if (!empty($goods_spec_id)){//选择了规则就是更新购物车详情表
                    if ($number <= 0){//数量为0直接删除
                        ShoppingDetail::where('shopping_id',$shopping_info->{'id'})->where('goods_id',$goods_id)->where('goods_spec_id',$goods_spec_id)->delete();//删除详情表
                    }else{
                        //检查该规格信息是否讯息
                        $details = ShoppingDetail::where('shopping_id',$shopping_info->{'id'})->where('goods_id',$goods_id)->where('goods_spec_id',$goods_spec_id)->select(['id'])->first();

                        if ($skuInfo->{'sku_type'} == 1){//商品只能单选
                            $number = 1;//单选购物数量只能为1
                        }elseif ($skuInfo->{'sku_type'} == 2 && $skuInfo->{'affect_quantity'} == 0){//可多选规格但是不能多添加购物车数量
                            $number = 1;//数量只能为1
                        }
                        if (empty($details)){
                            ShoppingDetail::create([
                                'shopping_id' => $shopping_id,
                                'goods_id' => $goods_id,
                                'goods_spec_id' => $goods_spec_id,
                                'number' => $number,
                            ]);
                        }elseif ($skuInfo->{'sku_type'} == 2 && $skuInfo->{'affect_quantity'} == 1){//可多选规格并且能多添加购物车数量
                            ShoppingDetail::where('shopping_id',$shopping_info->{'id'})->where('goods_id',$goods_id)->where('goods_spec_id',$goods_spec_id)->update(['number' => $number]);//跟新购物车
                        }
                    }
                }else{//没选规则就是更新主表
                    if ($number <= 0){//数量为0直接删除
                        Shopping::where('id',$shopping_info->{'id'})->delete();//删除主表
                        ShoppingDetail::where('shopping_id',$shopping_info->{'id'})->delete();//删除详情表
                    }else{
                        Shopping::where('id',$shopping_info->{'id'})->update(['number' => $number]);
                    }
                }

            }


            DB::commit();
            return ['code' => 1, 'msg' => '添加成功'];
        }catch (\Exception $e){
            DB::rollBack();
            return ['code' => 0, 'msg' => '添加失败'];
        }

    }


    /**
     * 删除购物车
     * @param $m_id
     * @param $shop_id
     * @return array
     */
    function delShopping($m_id,$shop_id)
    {
        //删除数据
        DB::beginTransaction();
        try {
            $where = [['m_id',$m_id], ['shop_id',$shop_id]];

            $shopping_info = Shopping::where($where)->select(['id', 'goods_id', 'number'])->get();
            foreach ($shopping_info as $v){
                Shopping::where('id',$v->{'id'})->delete();//删除主表
                ShoppingDetail::where('shopping_id',$v->{'id'})->delete();//删除详情表
            }

            DB::commit();
            return ['code' => 1, 'msg' => '删除成功'];
        }catch (\Exception $e){
            DB::rollBack();
            return ['code' => 0, 'msg' => '删除失败'];
        }

    }

}