293 lines
8.4 KiB
PHP
293 lines
8.4 KiB
PHP
<?php
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namespace app\api\model;
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use think\Cache;
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use app\api\model\Goods as GoodsModel;
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use app\common\library\helper;
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use app\common\service\wechat\wow\Shoping as WowService;
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/**
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* 购物车管理
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* Class Cart
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* @package app\api\model
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*/
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class Cart
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{
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/* @var string $error 错误信息 */
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public $error = '';
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/* @var \think\Model|\think\Collection $user 用户信息 */
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private $user;
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/* @var int $user_id 用户id */
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private $user_id;
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/* @var int $wxapp_id 小程序商城id */
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private $wxapp_id;
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/* @var array $cart 购物车列表 */
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private $cart = [];
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/* @var bool $clear 是否清空购物车 */
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private $clear = false;
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/**
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* 构造方法
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* Cart constructor.
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* @param \think\Model|\think\Collection $user
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*/
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public function __construct($user)
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{
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$this->user = $user;
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$this->user_id = $this->user['user_id'];
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$this->wxapp_id = $this->user['wxapp_id'];
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$this->cart = Cache::get('cart_' . $this->user_id) ?: [];
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}
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/**
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* 购物车列表 (含商品信息)
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* @return array
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* @param string $cartIds 请求参数
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* @throws \think\Exception
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* @throws \think\db\exception\DataNotFoundException
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* @throws \think\db\exception\ModelNotFoundException
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* @throws \think\exception\DbException
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*/
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public function getList($cartIds)
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{
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// 获取购物车商品列表
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return $this->getOrderGoodsList($cartIds);
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}
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/**
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* 获取购物车列表
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* @param string|null $cartIds 购物车索引集 (为null时则获取全部)
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* @return array
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*/
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public function getCartList($cartIds = null)
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{
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if (empty($cartIds)) return $this->cart;
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$cartList = [];
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$indexArr = (strpos($cartIds, ',') !== false) ? explode(',', $cartIds) : [$cartIds];
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foreach ($indexArr as $index) {
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isset($this->cart[$index]) && $cartList[$index] = $this->cart[$index];
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}
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return $cartList;
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}
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/**
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* 获取购物车中的商品列表
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* @param $cartIds
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* @return array|bool
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* @throws \think\Exception
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* @throws \think\db\exception\DataNotFoundException
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* @throws \think\db\exception\ModelNotFoundException
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* @throws \think\exception\DbException
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*/
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private function getOrderGoodsList($cartIds)
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{
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// 购物车商品列表
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$goodsList = [];
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// 获取购物车列表
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$cartList = $this->getCartList($cartIds);
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if (empty($cartList)) {
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$this->setError('当前购物车没有商品');
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return $goodsList;
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}
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// 购物车中所有商品id集
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$goodsIds = array_unique(helper::getArrayColumn($cartList, 'goods_id'));
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// 获取并格式化商品数据
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$sourceData = (new GoodsModel)->getListByIds($goodsIds);
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$sourceData = helper::arrayColumn2Key($sourceData, 'goods_id');
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// 格式化购物车数据列表
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foreach ($cartList as $key => $item) {
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// 判断商品不存在则自动删除
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if (!isset($sourceData[$item['goods_id']])) {
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$this->delete($key);
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continue;
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}
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/* @var GoodsModel $goods 商品信息 */
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$goods = clone $sourceData[$item['goods_id']];
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// 判断商品是否已删除
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if ($goods['is_delete']) {
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$this->delete($key);
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continue;
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}
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// 商品sku信息
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$goods['goods_sku'] = GoodsModel::getGoodsSku($goods, $item['goods_sku_id']);
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$goods['goods_sku_id'] = $item['goods_sku_id'];
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$goods['spec_sku_id'] = $goods['goods_sku']['spec_sku_id'];
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// 商品sku不存在则自动删除
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if (empty($goods['goods_sku'])) {
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$this->delete($key);
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continue;
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}
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// 商品单价
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$goods['goods_price'] = $goods['goods_sku']['goods_price'];
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// 购买数量
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$goods['total_num'] = $item['goods_num'];
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// 商品总价
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$goods['total_price'] = bcmul($goods['goods_price'], $item['goods_num'], 2);
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$goodsList[] = $goods->hidden(['category', 'content', 'image', 'sku']);
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}
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return $goodsList;
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}
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/**
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* 加入购物车
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* @param int $goodsId 商品id
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* @param int $goodsNum 加入购物车的数量
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* @param string $goodsSkuId 商品sku索引
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* @return bool
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* @throws \app\common\exception\BaseException
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* @throws \think\exception\DbException
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*/
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public function add($goodsId, $goodsNum, $goodsSkuId)
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{
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// 购物车商品索引
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$index = "{$goodsId}_{$goodsSkuId}";
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// 加入购物车后的商品数量
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$cartGoodsNum = $goodsNum + (isset($this->cart[$index]) ? $this->cart[$index]['goods_num'] : 0);
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// 获取商品信息
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$goods = GoodsModel::detail($goodsId);
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// 验证商品能否加入
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if (!$this->checkGoods($goods, $goodsSkuId, $cartGoodsNum)) {
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return false;
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}
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// 将商品同步到好物圈
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if (!$this->isExistGoodsId($goodsId)) {
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(new WowService($this->wxapp_id))->add($this->user, [$goods]);
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}
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// 记录到购物车列表
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$this->cart[$index] = [
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'goods_id' => $goodsId,
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'goods_num' => $cartGoodsNum,
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'goods_sku_id' => $goodsSkuId,
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'create_time' => time()
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];
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return true;
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}
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/**
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* 验证购物车中是否存在某商品
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* @param $goodsId
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* @return bool
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*/
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private function isExistGoodsId($goodsId)
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{
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foreach ($this->cart as $item) {
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if ($item['goods_id'] == $goodsId) return true;
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}
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return false;
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}
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/**
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* 验证商品是否可以购买
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* @param GoodsModel $goods 商品信息
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* @param string $goodsSkuId 商品sku索引
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* @param $cartGoodsNum
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* @return bool
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*/
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private function checkGoods($goods, $goodsSkuId, $cartGoodsNum)
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{
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// 判断商品是否下架
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if (!$goods || $goods['is_delete'] || $goods['goods_status']['value'] != 10) {
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$this->setError('很抱歉，商品信息不存在或已下架');
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return false;
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}
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// 商品sku信息
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$goods['goods_sku'] = GoodsModel::getGoodsSku($goods, $goodsSkuId);
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// 判断商品库存
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if ($cartGoodsNum > $goods['goods_sku']['stock_num']) {
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$this->setError('很抱歉，商品库存不足');
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return false;
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}
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return true;
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}
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/**
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* 减少购物车中某商品数量
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* @param int $goodsId
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* @param string $goodsSkuId
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*/
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public function sub($goodsId, $goodsSkuId)
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{
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$index = "{$goodsId}_{$goodsSkuId}";
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$this->cart[$index]['goods_num'] > 1 && $this->cart[$index]['goods_num']--;
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}
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/**
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* 删除购物车中指定商品
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* @param string $cartIds (支持字符串ID集)
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*/
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public function delete($cartIds)
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{
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$indexArr = strpos($cartIds, ',') !== false ? explode(',', $cartIds) : [$cartIds];
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foreach ($indexArr as $index) {
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if (isset($this->cart[$index])) unset($this->cart[$index]);
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}
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}
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/**
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* 获取当前用户购物车商品总数量(含件数)
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* @return int
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*/
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public function getTotalNum()
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{
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return helper::getArrayColumnSum($this->cart, 'goods_num');
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}
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/**
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* 获取当前用户购物车商品总数量(不含件数)
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* @return int
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*/
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public function getGoodsNum()
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{
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return count($this->cart);
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}
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/**
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* 析构方法
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* 将cart数据保存到缓存文件
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*/
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public function __destruct()
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{
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$this->clear !== true && Cache::set('cart_' . $this->user_id, $this->cart, 86400 * 15);
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}
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/**
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* 清空当前用户购物车
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* @param null $cartIds
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*/
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public function clearAll($cartIds = null)
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{
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if (empty($cartIds)) {
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$this->clear = true;
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Cache::rm('cart_' . $this->user_id);
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} else {
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$this->delete($cartIds);
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}
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}
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/**
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* 设置错误信息
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* @param $error
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*/
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private function setError($error)
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{
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empty($this->error) && $this->error = $error;
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}
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/**
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* 获取错误信息
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* @return string
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*/
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public function getError()
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{
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return $this->error;
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}
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}
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