68 lines
1.8 KiB
PHP
68 lines
1.8 KiB
PHP
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<?php
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namespace App\Service\business;
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use App\Models\business\PriceSheetModel;
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use App\Service\common\UtilsService;
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/**
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* 规格库存：stock=-1 表示不限，兼容历史数据全是不限。
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*/
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class StockService
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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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* 加入清单 / 下单前校验。sheetId=0 时跳过（还没选规格）。
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*/
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public function assertAvailable(int $sheetId, int $quantity): void
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{
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if ($sheetId <= 0) {
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return;
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}
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$sheet = PriceSheetModel::where('id', $sheetId)->where('deleted_at', 0)->first();
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if (empty($sheet)) {
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UtilsService::getInstance()->errorThrow('规格不存在');
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}
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$stock = (int) ($sheet['stock'] ?? -1);
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if ($stock < 0) {
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return;
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}
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if ($stock < $quantity) {
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UtilsService::getInstance()->errorThrow('库存不足（剩余 ' . $stock . '）');
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}
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}
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/**
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* 下单成功后扣库存；不限库存不写库。
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*/
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public function deduct(int $sheetId, int $quantity): void
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{
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if ($sheetId <= 0 || $quantity <= 0) {
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return;
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}
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$sheet = PriceSheetModel::where('id', $sheetId)->where('deleted_at', 0)->first();
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if (empty($sheet)) {
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return;
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}
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$stock = (int) ($sheet['stock'] ?? -1);
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if ($stock < 0) {
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return;
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}
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$next = max(0, $stock - $quantity);
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PriceSheetModel::where('id', $sheetId)->update([
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'stock' => $next,
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'updated_at' => time(),
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]);
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}
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}
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