<?php
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namespace app\api\service\coupon;
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use app\common\library\helper;
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/**
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* 优惠券抵扣金额
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*/
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class ProductDeductService
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{
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private $actualReducedMoney;
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private $coupon_column;
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private $price_column;
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/**
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* 构造方法
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*/
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public function __construct($coupon_column, $price_column)
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{
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$this->coupon_column = $coupon_column;
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$this->price_column = $price_column;
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}
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public function setProductCouponMoney($productList, $reducedMoney)
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{
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// 统计订单商品总金额,(单位分)
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$orderTotalPrice = 0;
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foreach ($productList as &$product) {
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$product[$this->price_column] *= 100;
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$orderTotalPrice += $product[$this->price_column];
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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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$productList = $this->getProductListWeight($productList, $orderTotalPrice);
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// 计算商品优惠券抵扣金额
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$this->setProductListCouponMoney($productList);
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// 总抵扣金额
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$totalCouponMoney = helper::getArrayColumnSum($productList, $this->coupon_column);
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$this->setProductListCouponMoneyFill($productList, $totalCouponMoney);
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$this->setProductListCouponMoneyDiff($productList, $totalCouponMoney);
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}
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return $productList;
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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 : $reducedMoney;
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}
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private function arraySortByWeight($productList)
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{
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return array_sort($productList, 'weight', true);
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}
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private function getProductListWeight($productList, $orderTotalPrice)
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{
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foreach ($productList as &$product) {
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$product['weight'] = $product[$this->price_column] / $orderTotalPrice;
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}
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return $this->arraySortByWeight($productList);
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}
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private function setProductListCouponMoney(&$productList)
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{
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foreach ($productList as &$product) {
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$product[$this->coupon_column] = bcmul($this->actualReducedMoney, $product['weight']);
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}
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return true;
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}
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private function setProductListCouponMoneyFill(&$productList, $totalCouponMoney)
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{
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if ($totalCouponMoney === 0) {
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$temReducedMoney = $this->actualReducedMoney;
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foreach ($productList as &$product) {
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if ($temReducedMoney === 0) break;
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$product[$this->coupon_column] = 1;
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$temReducedMoney--;
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}
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}
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return true;
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}
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private function setProductListCouponMoneyDiff(&$productList, $totalCouponMoney)
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{
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$tempDiff = $this->actualReducedMoney - $totalCouponMoney;
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foreach ($productList as &$product) {
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if ($tempDiff < 1) break;
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$product[$this->coupon_column]++ && $tempDiff--;
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}
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return true;
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}
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}
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