267 lines
9.0 KiB
PHP
267 lines
9.0 KiB
PHP
<?php
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namespace app\common\tools;
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use app\ydyd_service\model\ShoppingCartModel;
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use think\facade\Cache;
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class Cart
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{
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// 个人购物车标记前缀
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protected $cartName = 'USER_CART_INFO_';
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// 商品数据
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protected $goods = [];
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// 当前用户
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protected $user_id = 0;
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public function __construct()
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{
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$init_flag = false;
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$this->user_id = session('user_id');
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$this->cartName .= $this->user_id;
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$default_data = Cache::get($this->cartName)['goods_list']??[];//缓存数据索引：goods_list
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if (!$default_data){
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$_where[] = ['user_id',"=",$this->user_id];
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$_where[] = ['type',"=",''];//type为空：自营；否则如 hy：华源(目前统一标记为extend)
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//购物车数据--shopping_cart表
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$cart_data = ShoppingCartModel::field("batch_id as id,goods_number as num, unit_price as price")->where($_where)->select()->toArray();
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if ($cart_data){
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$init_flag = true;//true：shopping_cart表存在该用户的数据
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foreach ($cart_data as $item){
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$this->add($item, true);//添加到购物车数据缓存,返回值(类型：布尔)未处理
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}
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}
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}
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if (!$init_flag){
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$this->setGoods($default_data);//缓存数据存在时，$this->goods = 缓存数据;
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}
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}
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public function getGoods()
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{
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return $this->goods;
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}
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public function setGoods($goods)
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{
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$this->goods = $goods;
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}
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/**
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* @todo 现有业务逻辑待厘清
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* 添加购物车 同时更新model
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* @access public
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* @param array $data
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* $data为数组包含以下几个值
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* $Data= [
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* "id"=>1, //批次ID
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* "num"=>2, //商品数量
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* "options"=>array() //其他参数，如价格、颜色可以是数组或字符串|可以不添加
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* ]
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*
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* @throws \Exception
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* @return void
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*/
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public function add($data,$init_flag = false)
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{
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if (!is_array($data) || !isset($data['id']) || !isset($data['num']) || !isset($data['price']) || ($data['price'] <0)) {
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throw new \Exception('购物车ADD方法参数设置错误');//抛出异常，keys：捕获异常--异常处理
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}
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//添加商品支持多商品添加
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//$options = isset($data['options']) ? $data['options'] : '';
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//$sid = md5($data['id']);
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$sid = $data['id'];//batch_id
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$_where[] = ['user_id',"=",$this->user_id];
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$_where[] = ["batch_id","=",$sid];
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//生成唯一ID用于处理相同商品有不同属性时
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if (isset($this->goods[$sid])) {//缓存已存在？
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//如果数量为0删除商品
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if ($data['num'] == 0) {
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unset($this->goods[$sid]);
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if (!$init_flag){//缓存发起删除shopping_cart记录？
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//user_id+batch_id校验足矣？
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ShoppingCartModel::where($_where)->delete();//模型delete？模型对象or数据表？软删除？
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}
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} else {//不为0 增加
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//已经存在相同商品时增加商品数量
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$this->goods[$sid]['num'] = $this->goods[$sid]['num'] + $data['num'];
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$this->goods[$sid]['total'] = $this->goods[$sid]['num'] * $this->goods[$sid]['price'];//两次添加，销售价格不一样未处理
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if (!$init_flag){
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if ($this->goods[$sid]['num'] > 0){
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$update_data['goods_number'] = $this->goods[$sid]['num'];
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$update_data['unit_price'] = $this->goods[$sid]['price'];
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ShoppingCartModel::where($_where)->update($update_data);
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}else{
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ShoppingCartModel::where($_where)->delete();
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}
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}
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}
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} else {//不存在 写入
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if ($data['num'] > 0) {
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$this->goods[$sid] = $data;//batch_id索引对应商品数据
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$this->goods[$sid]['total'] = $data['num'] * $data['price'];//金额
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if (!$init_flag) {
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$add_data['user_id'] = $this->user_id;
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$add_data['batch_id'] = $sid;
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$add_data['unit_price'] = $data['price'];
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$add_data['goods_number'] = $data['num'];
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ShoppingCartModel::create($add_data);
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}
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}
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}
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//存在问题：每add一条数据即缓存一次。
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//修改方案：放到__construct方法内，所有数据add之后(foreach结束后)设置一次缓存
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return $this->store();
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}
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/**
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* 保存到缓存
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*
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* 缓存数据结构
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* $cart =
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* [
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* 'goods_list'=>[
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* 'batch_id'=>['batch_id'=>$batch_id,'goods_num'=>$num,'price'=>$price],//新增shopping_cart_id 用于匹配shopping_cart表记录
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* 'batch_id'=>['batch_id'=>$batch_id,'goods_num'=>$num,'price'=>$price],
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* ],
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* 'total_num' =>$num,//batch_id数量，相同batch_id合并处理
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* 'total_price'=>$total_price,//总金额
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* ]
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*
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* 重点 ： $goods 赋值逻辑！
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*/
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private function store()
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{
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$cart = [
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'goods_list' => $this->goods,
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'total_num' => $this->getTotalNums(),
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'total_price' => $this->getTotalPrice(),
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];
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return Cache::set($this->cartName,$cart,config('SYSTEM_CONSTANT')['USER_INFO_CACHE_TIME']);
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}
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/**
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* 统计购物车中商品分类数量
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*/
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public function getTotalNums()
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{
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$rows = 0;
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foreach ($this->goods as $v) {
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//$rows += $v['num'];
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$rows ++;
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}
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return $rows;
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}
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/**
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* 获得商品汇总价格
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*/
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public function getTotalPrice()
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{
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$total = 0;
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foreach ($this->goods as $v) {
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$total += $v['price'] * $v['num'];
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}
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return $total;
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}
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/**
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* 更新购物车数量(update+delete操作)
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* 适用场景：
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* 1.删除购物车数据，传值goods_number=0
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* 2.更新shopping_cart表中价格和数量信息
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*
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* @param $data
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* $data=[
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* "sid"=>'', //商品的唯一SID
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* "num"=>2, //商品数量
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* ]
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* @return bool
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* @throws \Exception
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*/
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public function update($data)
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{
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if ( ! isset($data['sid']) || ! isset($data['num'])) {
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throw new \Exception('购物车update方法参数错误，缺少sid或num值');
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}
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$sid = $data['sid'];
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$_where[] = ['user_id',"=",$this->user_id];
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$_where[] = ["batch_id","=",$sid];
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if (isset($this->goods[$sid])) {
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if ($data['num'] == 0) {
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unset($this->goods[$sid]);
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ShoppingCartModel::where($_where)->delete();
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} else {
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$this->goods[$sid]['num'] = $data['num'];
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if (isset($data['price']) && is_numeric($data['price']) && $data['price'] > 0){
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$this->goods[$sid]['price'] = $data['price'];
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}
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$this->goods[$sid]['total'] = $data['num'] * $this->goods[$sid]['price'];
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$update_data['goods_number'] = $this->goods[$sid]['num'];
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$update_data['unit_price'] = $this->goods[$sid]['price'];
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ShoppingCartModel::where($_where)->update($update_data);
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}
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return $this->store();
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}
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return false;
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}
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/**
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* 获得购物车中的所有数据(缓存中取出，初始状态为空)
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* @return mixed
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*/
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public function getAllData()
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{
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$this->store();//缓存数据,此处已有返回值，下一行冗余，直接return 本行,方法体改为： return $this->store();
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return Cache::get($this->cartName);//cartName格式：前缀+user_id缓存值(session)
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}
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/**
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* 获取购物车内所有商品的ID信息(batch_id)
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* @return array
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*/
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public function getAllId()
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{
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$id_arr = [];
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foreach ($this->goods as $k => $item) {
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$id_arr[] = $k;
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}
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return $id_arr;
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}
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/**
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* 删除购物车,同步删除数据库表记录
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* @param $sid 商品SID编号
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* @return bool
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* @throws \Exception
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*/
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public function del($sid)
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{
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if (isset($this->goods[$sid])) {
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unset($this->goods[$sid]);
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$_where[] = ['user_id',"=",$this->user_id];
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$_where[] = ["batch_id","=",$sid];
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ShoppingCartModel::where($_where)->delete();
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$this->store();
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return true;
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}
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return false;
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}
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/**
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* 删除所有商品
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* @return bool
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* @throws \Exception
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*/
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public function flush()
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{
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ShoppingCartModel::where("user_id",$this->user_id)->delete();
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$this->setGoods([]);
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$this->store();
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return true;
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}
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} |