初始化项目
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<?php
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// +----------------------------------------------------------------------
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// | 萤火商城系统 [ 致力于通过产品和服务，帮助商家高效化开拓市场 ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2017~2023 https://www.yiovo.com All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed 这不是一个自由软件，不允许对程序代码以任何形式任何目的的再发行
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// +----------------------------------------------------------------------
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// | Author: 萤火科技 <admin@yiovo.com>
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// +----------------------------------------------------------------------
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declare (strict_types=1);
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namespace app\api\service\coupon;
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use app\common\enum\coupon\ApplyRange as ApplyRangeEnum;
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use app\common\enum\coupon\CouponType as CouponTypeEnum;
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use app\common\service\BaseService;
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use app\common\library\helper;
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use cores\exception\BaseException;
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/**
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* 订单优惠券折扣服务类
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* Class GoodsDeduct
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* @package app\api\service\coupon
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*/
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class GoodsDeduct extends BaseService
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{
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// 实际抵扣金额
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private $actualReducedMoney;
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// 订单商品列表
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private $goodsList = [];
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// 优惠券信息
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private $couponInfo = [];
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// 实际参与优惠券折扣的商品记录
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private $rangeGoodsList = [];
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// 设置订单商品列表
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public function setGoodsList(iterable $goodsList): GoodsDeduct
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{
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$this->goodsList = $goodsList;
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return $this;
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}
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// 设置优惠券信息
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public function setCouponInfo(array $couponInfo): GoodsDeduct
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{
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$this->couponInfo = $couponInfo;
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return $this;
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}
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/**
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* 计算优惠券抵扣金额
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* @return GoodsDeduct
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* @throws BaseException
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*/
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public function setGoodsCouponMoney(): GoodsDeduct
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{
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// 验证当前类属性
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$this->checkAttribute();
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// 设置实际参与优惠券折扣的商品记录
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$this->setRangeGoodsList();
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// 计算实际抵扣的金额
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$this->setActualReducedMoney();
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// 实际抵扣金额为0
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if ($this->actualReducedMoney > 0) {
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// 计算商品的价格权重
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$this->setGoodsListWeight();
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// 计算商品优惠券抵扣金额
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$this->setGoodsListCouponMoney();
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// 总抵扣金额 (已分配的)
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$assignedCouponMoney = helper::getArrayColumnSum($this->rangeGoodsList, 'coupon_money');
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// 分配剩余的抵扣金额
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$this->setGoodsListCouponMoneyFill($assignedCouponMoney);
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$this->setGoodsListCouponMoneyDiff($assignedCouponMoney);
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}
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return $this;
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}
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// 获取实际参与优惠券折扣的商品记录
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public function getRangeGoodsList(): array
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{
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return $this->rangeGoodsList;
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}
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/**
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* 设置实际参与优惠券折扣的商品记录
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* @return void
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*/
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private function setRangeGoodsList()
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{
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$this->rangeGoodsList = [];
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foreach ($this->goodsList as $goods) {
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$goods['total_price'] *= 100;
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$goodsKey = "{$goods['goods_id']}-{$goods['goods_sku_id']}";
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switch ($this->couponInfo['apply_range']) {
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case ApplyRangeEnum::ALL:
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$this->rangeGoodsList[$goodsKey] = $goods;
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break;
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case ApplyRangeEnum::SOME:
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if (in_array($goods['goods_id'], $this->couponInfo['apply_range_config']['applyGoodsIds'])) {
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$this->rangeGoodsList[$goodsKey] = $goods;
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}
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break;
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case ApplyRangeEnum::EXCLUDE:
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if (!in_array($goods['goods_id'], $this->couponInfo['apply_range_config']['excludedGoodsIds'])) {
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$this->rangeGoodsList[$goodsKey] = $goods;
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}
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break;
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default:
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break;
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}
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}
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}
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/**
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* 验证当前类属性
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* @throws BaseException
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*/
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private function checkAttribute()
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{
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if (empty($this->goodsList) || empty($this->couponInfo)) {
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throwError('goodsList or couponInfo not found.');
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}
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}
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public function getActualReducedMoney()
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{
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return $this->actualReducedMoney;
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}
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/**
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* 计算实际抵扣的金额
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*/
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private function setActualReducedMoney()
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{
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// 获取当前订单商品总额
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$orderTotalPrice = $this->getOrderTotalPrice();
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// 计算最大抵扣金额
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$reducedMoney = 0;
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foreach ($this->rangeGoodsList as $goods) {
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$reducedMoney += $goods['total_price'];
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}
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// 计算打折金额
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if ($this->couponInfo['coupon_type'] == CouponTypeEnum::DISCOUNT) {
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$reducePrice = $reducedMoney - ($reducedMoney * ($this->couponInfo['discount'] / 10));
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} else {
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$reducePrice = $this->couponInfo['reduce_price'] * 100;
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}
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// 优惠券最大允许抵扣到一分钱，所以此处判断抵扣金额大于等于订单金额时，减去一分钱
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$this->actualReducedMoney = ($reducePrice >= $orderTotalPrice) ? $orderTotalPrice - 1 : $reducePrice;
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}
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/**
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* 获取当前订单商品总额
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* @return float|int
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*/
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private function getOrderTotalPrice()
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{
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$orderTotalPrice = 0;
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foreach ($this->goodsList as $goods) {
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$orderTotalPrice += ($goods['total_price'] * 100);
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}
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return $orderTotalPrice;
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}
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/**
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* 计算商品抵扣的权重(占比)
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*/
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private function setGoodsListWeight()
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{
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$orderTotalPrice = helper::getArrayColumnSum($this->rangeGoodsList, 'total_price');
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foreach ($this->rangeGoodsList as &$goods) {
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$goods['weight'] = round($goods['total_price'] / $orderTotalPrice, 6);
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}
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array_sort($this->rangeGoodsList, 'weight', true);
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}
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/**
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* 计算商品抵扣的金额
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*/
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private function setGoodsListCouponMoney(): void
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{
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foreach ($this->rangeGoodsList as &$goods) {
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$goods['coupon_money'] = helper::bcmul($this->actualReducedMoney, $goods['weight'], 0);
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}
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}
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private function setGoodsListCouponMoneyFill($assignedCouponMoney): void
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{
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if ($assignedCouponMoney === 0) {
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$temReducedMoney = $this->actualReducedMoney;
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foreach ($this->rangeGoodsList as &$goods) {
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if ($temReducedMoney === 0) break;
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$goods['coupon_money'] = 1;
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$temReducedMoney--;
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}
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}
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}
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private function setGoodsListCouponMoneyDiff($assignedCouponMoney): void
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{
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$tempDiff = $this->actualReducedMoney - $assignedCouponMoney;
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foreach ($this->rangeGoodsList as &$goods) {
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if ($tempDiff < 1) break;
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$goods['coupon_money']++ && $tempDiff--;
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}
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}
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}
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