90 lines
2.8 KiB
PHP
90 lines
2.8 KiB
PHP
<?php
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namespace app\api\service\coupon;
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use app\common\library\helper;
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class GoodsDeduct
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{
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private $actualReducedMoney;
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public function setGoodsCouponMoney($goodsList, $reducedMoney)
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{
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// 统计订单商品总金额,(单位分)
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$orderTotalPrice = 0;
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foreach ($goodsList as &$goods) {
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$goods['total_price'] *= 100;
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$orderTotalPrice += $goods['total_price'];
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}
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// 计算实际抵扣金额
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$this->setActualReducedMoney($reducedMoney, $orderTotalPrice);
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// 实际抵扣金额为0，
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if ($this->actualReducedMoney > 0) {
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// 计算商品的价格权重
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$goodsList = $this->getGoodsListWeight($goodsList, $orderTotalPrice);
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// 计算商品优惠券抵扣金额
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$this->setGoodsListCouponMoney($goodsList);
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// 总抵扣金额
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$totalCouponMoney = helper::getArrayColumnSum($goodsList, 'coupon_money');
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$this->setGoodsListCouponMoneyFill($goodsList, $totalCouponMoney);
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$this->setGoodsListCouponMoneyDiff($goodsList, $totalCouponMoney);
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}
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return $goodsList;
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}
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public function getActualReducedMoney()
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{
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return $this->actualReducedMoney;
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}
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private function setActualReducedMoney($reducedMoney, $orderTotalPrice)
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{
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$reducedMoney *= 100;
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$this->actualReducedMoney = ($reducedMoney >= $orderTotalPrice) ? $orderTotalPrice - 1 : $reducedMoney;
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}
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private function arraySortByWeight($goodsList)
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{
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return array_sort($goodsList, 'weight', true);
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}
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private function getGoodsListWeight($goodsList, $orderTotalPrice)
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{
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foreach ($goodsList as &$goods) {
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$goods['weight'] = $goods['total_price'] / $orderTotalPrice;
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}
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return $this->arraySortByWeight($goodsList);
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}
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private function setGoodsListCouponMoney(&$goodsList)
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{
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foreach ($goodsList as &$goods) {
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$goods['coupon_money'] = bcmul($this->actualReducedMoney, $goods['weight']);
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}
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return true;
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}
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private function setGoodsListCouponMoneyFill(&$goodsList, $totalCouponMoney)
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{
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if ($totalCouponMoney === 0) {
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$temReducedMoney = $this->actualReducedMoney;
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foreach ($goodsList 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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return true;
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}
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private function setGoodsListCouponMoneyDiff(&$goodsList, $totalCouponMoney)
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{
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$tempDiff = $this->actualReducedMoney - $totalCouponMoney;
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foreach ($goodsList 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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return true;
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}
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} |