<?php

namespace app\common\tools;

use app\ydyd_service\model\UserCartModel;
use think\Db;
use think\facade\Cache;

class UserExtendCart
{
    /*************************************************************/
    // 华源商品数据
    protected $ex_goods = [];
    /*************************************************************/
    // 当前用户
    protected $user_id = 0;

    public function __construct($user_id=null)
    {
		$this->user_id = session('user_id')?session('user_id'):$user_id;
        //增加扩展的华源商品 不加入缓存  实时读取数据库
        $extend_where[] = ['user_id',"=",$this->user_id];
        $extend_where[] = ['type',"=",'extend'];
        //$extend_cart_data = Db::name("shopping_cart")->where($extend_where)->column("batch_id as id,goods_number as num, unit_price as price, type, extend_data",'batch_id');
        //扩展商品无price_id字段，暂用batch_id代替
        $extend_cart_data = Db::name("user_cart")->where($extend_where)->column("id,batch_id,goods_number as num,unit_price as price,type,extend_data",'batch_id');
        if ($extend_cart_data){
            foreach ($extend_cart_data as $item){
                $this->initExCart($item, true);
            }
            //$this->setExtendGoods($extend_cart_data);//不使用缓存
            $this->setExtendGoods($this->ex_goods);//不使用缓存
            $this->extend_store();
        }


    }

    public function getExtendGoods()
    {
        return $this->ex_goods;
    }

    public function setExtendGoods($goods)
    {
        $this->ex_goods = $goods;
    }

    /**
     * 初始化 加入购物车-》华源商品扩展
     * @param $data
     * @param bool $init_flag
     * @return mixed
     * @throws \Exception
     */
    public function initExCart($data,$init_flag = false)
    {
        if ($data && $init_flag){
            $pid= $data['batch_id'];
            $this->ex_goods[$pid]['id']   = $data['id'];
            $this->ex_goods[$pid]['num']   = $data['num'];
            $this->ex_goods[$pid]['batch_id']   = $data['batch_id'];
            $this->ex_goods[$pid]['price']   = $data['price'];
            $this->ex_goods[$pid]['total'] = $this->ex_goods[$pid]['num'] * $this->ex_goods[$pid]['price'];
            $this->ex_goods[$pid]['type']  = 'extend';
            $this->ex_goods[$pid]['extend_data'] = $data['extend_data'];
        }

    }

    /***************************************************/
    /**
     * 加入购物车-》华源商品扩展
     * @param $data
     * @param bool $init_flag
     * @return mixed
     * @throws \Exception
     */
    public function add($data,$init_flag = false)
    {
        if (!is_array($data) || !isset($data['id']) || !isset($data['num']) || !isset($data['price']) || ($data['price'] <0)) {
            throw new \Exception('购物车ADD方法参数设置错误');
        }
        //添加商品支持多商品添加
        //$options = isset($data['options']) ? $data['options'] : '';
        //$sid     = md5($data['id']);
        $sid = $data['id'];
        $_where[] = ['user_id',"=",$this->user_id];
        $_where[] = ["batch_id","=",$sid];
        //生成维一ID用于处理相同商品有不同属性时
        if (isset($this->ex_goods[$sid])) {
            //如果数量为0删除商品
            if ($data['num'] <= 0) {
                unset($this->ex_goods[$sid]);
                UserCartModel::where($_where)->delete();
            } else {
                //已经存在相同商品时增加商品数量
                $this->ex_goods[$sid]['num']   = $this->ex_goods[$sid]['num'] + $data['num'];
                $this->ex_goods[$sid]['total'] = $this->ex_goods[$sid]['num'] * $this->ex_goods[$sid]['price'];
                $this->ex_goods[$sid]['type']  = 'extend';
                $this->ex_goods[$sid]['extend_data'] = $data['extend_data'];

                if (!$init_flag){
                    $update_data['goods_number'] = $this->ex_goods[$sid]['num'];
                    $update_data['unit_price'] = $this->ex_goods[$sid]['price'];
                    $update_data['type'] = 'extend';
                    $update_data['extend_data'] = $this->ex_goods[$sid]['extend_data'];
                    UserCartModel::where($_where)->update($update_data);
                }
            }
        } else {
            if ($data['num'] > 0) {
                $this->ex_goods[$sid]          = $data;
                $this->ex_goods[$sid]['total'] = $data['num'] * $data['price'];

                if (!$init_flag) {
                    $add_data['user_id'] = $this->user_id;
                    $add_data['batch_id'] = $sid;
                    $add_data['unit_price'] = $data['price'];
                    $add_data['goods_number'] = $data['num'];
                    $add_data['type'] = 'extend';
                    $add_data['extend_data'] = $data['extend_data'];
                    UserCartModel::create($add_data);
                }
            }
        }

        return true;
    }
    /******************************************************/

    /****************************************************/
    // 扩展商品 不加入缓存
    private function extend_store(){
        $cart = [
            'goods_list'       => $this->ex_goods,
            'total_num'   => $this->getTotalNums(),
            'total_price' => $this->getTotalPrice(),
            'price_id' => $this->getAllPriceID(),
        ];
        return $cart;
    }
    /*****************************************************/


    /**
     * 统计购物车中商品分类数量
     */
    public function getTotalNums()
    {
        $rows = 0;
        foreach ($this->ex_goods as $v) {
            //$rows += $v['num'];
            $rows ++;
        }
        return $rows;
    }

    /**
     * 获得商品汇总价格
     */
    public function getTotalPrice()
    {
        $total = 0;
        foreach ($this->ex_goods as $v) {
            $total += $v['price'] * $v['num'];
        }
        return $total;
    }

    /**
     * batch_id 充当price_id
     * */
    public function getAllPriceId(){
        $data = [];
        foreach ($this->ex_goods as $v) {
            $data[]= $v['batch_id'];
        }
        return $data;
    }


    /**
     * 更新购物车数量
     * @param $data
     *  $data=[
     *      "sid"=>'', //商品的唯一SID
     *      "num"=>2, //商品数量
     *  ]
     * @return bool
     * @throws \Exception
     */
    public function update($data)
    {
        if ( ! isset($data['sid']) || ! isset($data['num'])) {
            throw new \Exception('购物车update方法参数错误，缺少sid或num值');
        }

        $sid = $data['sid'];
        $_where[] = ['user_id',"=",$this->user_id];
        $_where[] = ["batch_id","=",$sid];

        if (isset($this->ex_goods[$sid])) {
            if ($data['num'] == 0) {
                unset($this->ex_goods[$sid]);
                UserCartModel::where($_where)->delete();
            } else {
                $this->ex_goods[$sid]['num'] = $data['num'];
                if (isset($data['price']) && is_numeric($data['price']) && $data['price'] > 0){
                    $this->ex_goods[$sid]['price'] = $data['price'];
                }
                $this->ex_goods[$sid]['total'] = $data['num'] * $this->ex_goods[$sid]['price'];
                $update_data['goods_number'] = $this->ex_goods[$sid]['num'];
                $update_data['unit_price'] = $this->ex_goods[$sid]['price'];
                UserCartModel::where($_where)->update($update_data);
            }
            return true;
        }
        return false;
    }

    /**
     * 获得购物车中的所有数据
     * @return mixed
     */
    public function getAllData()
    {
        return $this->extend_store();
    }

    /**
     * 获取购物车内所有商品的ID信息
     * @return array
     */
    public function getAllId()
    {
        $id_arr = [];
        foreach ($this->ex_goods as $k => $item) {
            $id_arr[] = $k;
        }
        return $id_arr;
    }

    /**
     * 获取购物车内所有商品的ID信息(user_cart.id)
     * @return array
     */
    public function getAllUcId()
    {
        $id_arr = [];
        if (is_array($this->ex_goods)&&$this->ex_goods){
            foreach ($this->ex_goods as $k => $item) {
                $id_arr[] = $item['id'];
            }
        }
        return $id_arr;
    }

    /**
     * 删除购物车
     * @param $sid 商品SID编号
     * @return bool
     * @throws \Exception
     */
    public function del($sid)
    {
        if (isset($this->ex_goods[$sid])) {
            unset($this->ex_goods[$sid]);
            $_where[] = ['user_id',"=",$this->user_id];
            $_where[] = ["batch_id","=",$sid];
            ShoppingCartModel::where($_where)->delete();
            return true;
        }
        return false;
    }

    /**
     * 删除所有商品
     * @return bool
     * @throws \Exception
     */
    public function flush()
    {
        //ShoppingCartModel::where("user_id",$this->user_id)->delete();
        UserCartModel::where("user_id",$this->user_id)->delete();
        $this->setExtendGoods([]);
        $this->extend_store();
        return true;
    }
}