feat(procurement): 實作採購退回單模組並修復商品選單報錯

resources/js/hooks/usePurchaseReturnForm.ts

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+import { useState, useEffect } from "react";
+import type { PurchaseReturn, PurchaseReturnItem, PurchaseReturnStatus } from "@/types/purchase-return";
+import type { Supplier } from "@/types/purchase-order";
+
+interface UsePurchaseReturnFormProps {
+    purchaseReturn?: PurchaseReturn;
+    suppliers: Supplier[];
+}
+
+export function usePurchaseReturnForm({ purchaseReturn, suppliers }: UsePurchaseReturnFormProps) {
+    const [vendorId, setVendorId] = useState<string | number>(purchaseReturn?.vendor_id || "");
+    const [warehouseId, setWarehouseId] = useState<string | number>(purchaseReturn?.warehouse_id || "");
+    const [returnDate, setReturnDate] = useState(purchaseReturn?.return_date || new Date().toISOString().split('T')[0]);
+    const [items, setItems] = useState<PurchaseReturnItem[]>(purchaseReturn?.items || []);
+    const [remarks, setRemarks] = useState(purchaseReturn?.remarks || "");
+    const [status, setStatus] = useState<PurchaseReturnStatus>(purchaseReturn?.status || "draft");
+    const [taxAmount, setTaxAmount] = useState<string | number>(purchaseReturn?.tax_amount || 0);
+
+    // 同步外部傳入的 order 更新 (例如重新執行 edit 路由)
+    useEffect(() => {
+        if (purchaseReturn) {
+            setVendorId(purchaseReturn.vendor_id);
+            setWarehouseId(purchaseReturn.warehouse_id);
+            setReturnDate(purchaseReturn.return_date);
+            setItems(purchaseReturn.items || []);
+            setRemarks(purchaseReturn.remarks || "");
+            setStatus(purchaseReturn.status);
+            setTaxAmount(purchaseReturn.tax_amount || 0);
+        }
+    }, [purchaseReturn]);
+
+    const resetForm = () => {
+        setVendorId("");
+        setWarehouseId("");
+        setReturnDate(new Date().toISOString().split('T')[0]);
+        setItems([]);
+        setRemarks("");
+        setStatus("draft");
+        setTaxAmount(0);
+    };
+
+    const selectedVendor = suppliers.find((s) => String(s.id) === String(vendorId));
+
+    // 新增商品項目
+    const addItem = () => {
+        if (!selectedVendor) return;
+
+        setItems([
+            ...items,
+            {
+                product_id: 0,
+                quantity_returned: 1,
+                unit_price: 0,
+                total_amount: 0,
+                batch_number: "",
+            },
+        ]);
+    };
+
+    // 移除商品項目
+    const removeItem = (index: number) => {
+        setItems(items.filter((_, i) => i !== index));
+    };
+
+    // 更新商品項目
+    const updateItem = (index: number, field: keyof PurchaseReturnItem, value: any) => {
+        const newItems = [...items];
+        const item = { ...newItems[index] };
+
+        if (field === "product_id" && selectedVendor) {
+            const product = selectedVendor.commonProducts.find((p) => String(p.productId) === String(value));
+            if (product) {
+                // @ts-ignore
+                item.product_id = Number(value);
+                item.product_name = product.productName;
+                item.unit_price = product.lastPrice || 0;
+                item.total_amount = Number(item.quantity_returned) * Number(item.unit_price);
+            }
+        } else if (field === "total_amount") {
+            item.total_amount = Number(value);
+            if (item.quantity_returned > 0) {
+                item.unit_price = Number(item.total_amount) / Number(item.quantity_returned);
+            }
+        } else if (field === "quantity_returned" || field === "unit_price") {
+            // @ts-ignore
+            item[field] = Number(value);
+            if (field === "quantity_returned" && item.unit_price > 0) {
+                item.total_amount = Number(value) * item.unit_price;
+            } else if (field === "unit_price" && item.quantity_returned > 0) {
+                item.total_amount = item.quantity_returned * Number(value);
+            }
+        } else {
+            // @ts-ignore
+            item[field] = value;
+        }
+
+        newItems[index] = item;
+        setItems(newItems);
+    };
+
+    return {
+        vendorId,
+        warehouseId,
+        returnDate,
+        items,
+        remarks,
+        status,
+        selectedVendor,
+        taxAmount,
+
+        setVendorId,
+        setWarehouseId,
+        setReturnDate,
+        setRemarks,
+        setStatus,
+        setTaxAmount,
+
+        addItem,
+        removeItem,
+        updateItem,
+        resetForm,
+    };
+}