99 lines
3.3 KiB
PHP
99 lines
3.3 KiB
PHP
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<?php
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namespace App\Service\business;
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/**
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* 套餐报价与补差价
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*
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* 后台存倍率=1 的基准分；小程序展示/下单再乘用户倍率。
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* 清单应付用「套餐价 + 当前明细合计 − 原价快照」，删行、换规格、加散件都落在这一条公式里。
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*/
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class PackageQuoteService
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{
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private static mixed $_instance;
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public static function getInstance(): null|static
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{
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$name = get_called_class();
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if (!isset(self::$_instance[$name])) {
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self::$_instance[$name] = new static();
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}
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return self::$_instance[$name];
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}
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/**
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* 后台改搭配：原价变了就把差额补到套餐报价上，不允许报负价
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*/
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public function applyOriginalDiff(int $oldOriginal, int $newOriginal, int $packageAmount): int
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{
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return max(0, $packageAmount + ($newOriginal - $oldOriginal));
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}
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/**
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* 基准价乘用户倍率，仍回整数分
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*/
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public function applyMultiplier(int $cents, mixed $multiplier = 1): int
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{
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if ($cents <= 0) {
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return 0;
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}
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$price = PriceService::getInstance();
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$yuan = $price->centsToYuan($cents);
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return $price->yuanToCents($yuan, $multiplier);
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}
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/**
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* 套餐清单应付
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*
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* 未绑套餐：应付 = 当前明细合计。
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* 已绑套餐：应付 = 套餐价快照 + 当前合计 − 原价快照（删除的套餐行会从原价里扣掉）。
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*
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* @param array<int, array{unit_price?:int,quantity?:int}> $items
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* @return array{package_amount:int,original_amount:int,diff_amount:int,payable_amount:int,items_amount:int}
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*/
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public function listPayable(int $packageId, int $packageAmount, int $originalAmount, array $items): array
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{
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$itemsAmount = 0;
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foreach ($items as $item) {
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$qty = max(1, (int) ($item['quantity'] ?? 1));
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$itemsAmount += (int) ($item['unit_price'] ?? 0) * $qty;
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}
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if ($packageId <= 0) {
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return [
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'package_amount' => 0,
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'original_amount' => $itemsAmount,
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'diff_amount' => 0,
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'payable_amount' => $itemsAmount,
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'items_amount' => $itemsAmount,
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];
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}
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$payable = max(0, $packageAmount + $itemsAmount - $originalAmount);
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return [
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'package_amount' => $packageAmount,
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'original_amount' => $originalAmount,
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'diff_amount' => $payable - $packageAmount,
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'payable_amount' => $payable,
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'items_amount' => $itemsAmount,
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];
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}
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/**
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* 给金额数组补 *_text 元字段，方便前端直接渲染
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*
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* @param array<string, int> $amounts
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* @return array<string, int|string>
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*/
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public function withText(array $amounts, bool $showPrice = true): array
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{
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$price = PriceService::getInstance();
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foreach (['package_amount', 'original_amount', 'diff_amount', 'payable_amount', 'items_amount', 'discount_amount'] as $key) {
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if (!array_key_exists($key, $amounts)) {
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continue;
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}
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$cents = (int) $amounts[$key];
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$amounts[$key . '_text'] = $showPrice ? $price->centsToYuan($cents) : PriceService::MASK;
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}
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return $amounts;
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}
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}
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