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<?php
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namespace App\Services;
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use App\Exceptions\RepositoryException;
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use App\Models\ProductModel;
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use App\Models\ProductPriceModel;
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use App\Models\PurchaseOrderItemModel;
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use App\Models\PurchaseOrderModel;
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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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* C1 订单汇总生成采购单
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*
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* 流程（事务内）：
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* 1. 行锁查询当日全部「待汇总」订单（无则报错；状态条件天然排除已汇总订单，幂等）
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* 2. 展开明细按商品聚合（Σquantity，快照品名/规格；供应商取商品默认供应商）
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* 3. 估算单价 = 该商品最低等级价（product_price MIN），amount = quantity × 估算单价
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* 4. 创建采购单头（PO 单号，estimate_amount = Σitems.amount）
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* 5. 明细按「分类 sort → 商品 sort」排序写入 sort 行号
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* 6. 源订单批量回写 status = 已汇总
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*/
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class PurchaseGenerateService
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{
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public function __construct(private readonly BillNumberService $billNumberService)
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{
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}
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/**
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* @param string $date 订货/采购日期（Y-m-d）
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* @param int $operatorId 制单人（后台系统用户ID）
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*/
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public function generate(string $date, int $operatorId): PurchaseOrderModel
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{
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return DB::transaction(function () use ($date, $operatorId) {
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// 1. 行锁当日待汇总订单（并发防护）
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$orders = StoreOrderModel::query()
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->whereDate('order_date', $date)
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->where('status', StoreOrderModel::STATUS_PENDING)
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->lockForUpdate()
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->get();
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if ($orders->isEmpty()) {
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throw new RepositoryException('当日无待汇总订单');
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}
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// 2. 展开明细按商品聚合
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$aggregated = [];
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$orderIds = [];
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foreach ($orders as $order) {
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$orderIds[] = $order->id;
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foreach ($order->items as $item) {
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$productId = (int) $item->product_id;
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if (! isset($aggregated[$productId])) {
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$aggregated[$productId] = [
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'product_id' => $productId,
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'product_name' => $item->product_name,
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'product_spec' => $item->product_spec,
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'quantity' => '0',
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];
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}
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$aggregated[$productId]['quantity'] = bcadd(
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$aggregated[$productId]['quantity'],
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(string) $item->quantity,
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2
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);
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}
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}
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if ($aggregated === []) {
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throw new RepositoryException('当日待汇总订单均无明细，无法生成采购单');
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}
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$products = ProductModel::withTrashed()
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->with('category:id,sort')
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->whereIn('id', array_keys($aggregated))
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->get()
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->keyBy('id');
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// 3. 估算单价 = 最低等级价
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$minPrices = ProductPriceModel::query()
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->whereIn('product_id', array_keys($aggregated))
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->groupBy('product_id')
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->selectRaw('product_id, MIN(price) as min_price')
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->pluck('min_price', 'product_id');
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// 组装明细行并按「分类 sort → 商品 sort」排序
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$rows = [];
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foreach ($aggregated as $productId => $item) {
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$product = $products->get($productId);
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$price = (string) ($minPrices[$productId] ?? '0');
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$rows[] = [
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'product_id' => $productId,
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'supplier_id' => (int) ($product->supplier_id ?? 0),
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'product_name' => $item['product_name'],
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'product_spec' => $item['product_spec'],
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'price' => $price,
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'quantity' => $item['quantity'],
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'amount' => bcmul($item['quantity'], $price, 2),
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'category_sort' => (int) ($product->category->sort ?? 9999),
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'product_sort' => (int) ($product->sort ?? 9999),
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];
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}
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usort($rows, static fn (array $a, array $b): int =>
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[$a['category_sort'], $a['product_sort'], $a['product_id']]
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<=> [$b['category_sort'], $b['product_sort'], $b['product_id']]);
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$estimateAmount = array_reduce(
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$rows,
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static fn (string $carry, array $row): string => bcadd($carry, $row['amount'], 2),
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'0'
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);
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$totalQuantity = array_reduce(
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$rows,
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static fn (string $carry, array $row): string => bcadd($carry, $row['quantity'], 2),
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'0'
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);
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// 4. 采购单头
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$purchase = PurchaseOrderModel::create([
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'purchase_no' => $this->billNumberService->make('PO'),
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'purchase_date' => $date,
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'status' => PurchaseOrderModel::STATUS_PENDING,
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'total_quantity' => $totalQuantity,
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'total_weight' => 0,
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'estimate_amount' => $estimateAmount,
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'actual_amount' => 0,
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'operator_id' => $operatorId,
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]);
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// 5. 采购明细（sort 行号）
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$sort = 1;
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foreach ($rows as $row) {
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PurchaseOrderItemModel::create([
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'purchase_id' => $purchase->id,
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'product_id' => $row['product_id'],
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'supplier_id' => $row['supplier_id'],
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'product_name' => $row['product_name'],
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'product_spec' => $row['product_spec'],
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'price' => $row['price'],
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'quantity' => $row['quantity'],
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'weight' => 0,
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'amount' => $row['amount'],
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'sort' => $sort++,
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'is_sent' => PurchaseOrderItemModel::NOT_SENT,
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]);
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}
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// 6. 源订单回写「已汇总」
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StoreOrderModel::whereIn('id', $orderIds)
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->update(['status' => StoreOrderModel::STATUS_SUMMARIZED]);
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return $purchase;
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});
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}
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}
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