115 lines
4.7 KiB
PHP
115 lines
4.7 KiB
PHP
<?php
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namespace App\Services;
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use App\Exceptions\RepositoryException;
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use App\Models\PurchaseAllocationModel;
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use App\Models\PurchaseOrderItemModel;
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use App\Models\PurchaseOrderModel;
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use App\Models\StoreOrderItemModel;
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use App\Models\StoreOrderModel;
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use Illuminate\Support\Facades\DB;
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/**
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* D3 采购金额分摊
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*
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* 流程（事务内）：
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* 1. 采购单须已录入实际金额（存在 amount>0 的明细），否则拒绝
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* 2. 每个采购明细溯源「采购日当天、已汇总订单」中该商品的订货明细
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* 3. 按订货数量比例分摊实际金额/数量/重量：bcmul(item.amount, bcdiv(item_qty, total_qty, 6), 2)
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* 尾差修正——最后一行承担舍入差额，保证 Σallocation.amount === item.amount（金额守恒）
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* 4. 重复分摊先删旧记录再重建（幂等）
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*/
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class PurchaseAllocateService
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{
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/**
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* @return int 生成的分摊记录数
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*/
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public function allocate(PurchaseOrderModel $purchase): int
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{
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return DB::transaction(function () use ($purchase) {
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$items = PurchaseOrderItemModel::query()
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->where('purchase_id', $purchase->id)
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->lockForUpdate()
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->get();
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// 1. 须已录入实际金额
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if (! $items->contains(static fn ($item) => (float) $item->amount > 0)) {
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throw new RepositoryException('采购单尚未录入实际金额，无法分摊');
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}
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// 2. 溯源采购日当天「已汇总」订单的订货明细，按商品分组
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$orderItems = StoreOrderItemModel::query()
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->join('store_order', 'store_order.id', '=', 'store_order_item.order_id')
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->whereDate('store_order.order_date', $purchase->purchase_date)
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->where('store_order.status', StoreOrderModel::STATUS_SUMMARIZED)
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->select('store_order_item.*')
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->get()
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->groupBy('product_id');
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// 4. 幂等：删除旧分摊记录
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PurchaseAllocationModel::query()
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->whereIn('purchase_item_id', $items->pluck('id'))
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->delete();
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$count = 0;
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$now = now();
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foreach ($items as $item) {
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$sources = $orderItems->get((int) $item->product_id);
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if ($sources === null || $sources->isEmpty()) {
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continue;
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}
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$totalQty = $sources->reduce(
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static fn (string $carry, $orderItem): string => bcadd($carry, (string) $orderItem->quantity, 2),
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'0'
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);
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if ((float) $totalQty <= 0) {
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continue;
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}
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$sourceValues = $sources->values();
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$lastIndex = $sourceValues->count() - 1;
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$allocatedAmount = '0';
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$allocatedQuantity = '0';
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$allocatedWeight = '0';
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$records = [];
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foreach ($sourceValues as $index => $orderItem) {
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if ($index === $lastIndex) {
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// 3. 尾差修正：最后一行 = 总额 − 已分摊，保证守恒
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$amount = bcsub((string) $item->amount, $allocatedAmount, 2);
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$quantity = bcsub((string) $item->quantity, $allocatedQuantity, 2);
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$weight = bcsub((string) $item->weight, $allocatedWeight, 3);
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} else {
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$ratio = bcdiv((string) $orderItem->quantity, $totalQty, 6);
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$amount = bcmul((string) $item->amount, $ratio, 2);
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$quantity = bcmul((string) $item->quantity, $ratio, 2);
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$weight = bcmul((string) $item->weight, $ratio, 3);
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$allocatedAmount = bcadd($allocatedAmount, $amount, 2);
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$allocatedQuantity = bcadd($allocatedQuantity, $quantity, 2);
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$allocatedWeight = bcadd($allocatedWeight, $weight, 3);
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}
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$records[] = [
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'purchase_item_id' => $item->id,
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'order_item_id' => $orderItem->id,
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'store_id' => $orderItem->store_id,
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'product_id' => $item->product_id,
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'quantity' => $quantity,
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'weight' => $weight,
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'amount' => $amount,
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'created_at' => $now,
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'updated_at' => $now,
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];
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}
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PurchaseAllocationModel::insert($records);
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$count += count($records);
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}
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return $count;
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});
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}
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}
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