import AuthenticatedLayout from '@/Layouts/AuthenticatedLayout';
import { Head, useForm, Link, router } from '@inertiajs/react';
import { Button } from '@/Components/ui/button';
import { Input } from '@/Components/ui/input';
import { Label } from '@/Components/ui/label';
import {
    Select,
    SelectContent,
    SelectItem,
    SelectTrigger,
    SelectValue,
} from '@/Components/ui/select';
import { SearchableSelect } from '@/Components/ui/searchable-select';
import React, { useState, useEffect } from 'react';
import {
    Table,
    TableBody,
    TableCell,
    TableHead,
    TableHeader,
    TableRow,
} from '@/Components/ui/table';

import { StatusBadge } from "@/Components/shared/StatusBadge";


import {
    Plus,
    Trash2,
    Calendar as CalendarIcon,
    Save,
    ArrowLeft,
    Package
} from 'lucide-react';
import axios from 'axios';
import { PurchaseOrderStatus } from '@/types/purchase-order';
import { STATUS_CONFIG } from '@/constants/purchase-order';
import { DuplicateWarningDialog } from './components/DuplicateWarningDialog';





// 待進貨採購單 Item 介面
interface PendingPOItem {
    id: number;
    product_id: number;
    product_name: string;
    product_code: string;
    unit: string;
    quantity: number;
    received_quantity: number;
    remaining: number;
    unit_price: number;
    batchMode?: 'existing' | 'new' | 'none';
    originCountry?: string; // For new batch generation
}

// 待進貨採購單介面
interface PendingPO {
    id: number;
    code: string;
    status: PurchaseOrderStatus;
    vendor_id: number;
    vendor_name: string;
    warehouse_id: number | null;
    order_date: string;
    items: PendingPOItem[];
}

// 廠商介面
interface Vendor {
    id: number;
    name: string;
    code: string;
}

// 編輯模式的進貨單資料
interface ReceiptData {
    id: number;
    code: string;
    type: string;
    warehouse_id: number;
    vendor_id: number | null;
    vendor: Vendor | null;
    purchase_order_id: number | null;
    purchase_order?: any;
    received_date: string;
    remarks: string;
    items: any[];
}

interface Props {
    warehouses: { id: number; name: string; type: string }[];
    pendingPurchaseOrders: PendingPO[];
    vendors: Vendor[];
    receipt?: ReceiptData;
}

export default function GoodsReceiptCreate({ warehouses, pendingPurchaseOrders, vendors, receipt }: Props) {
    const isEditMode = !!receipt;
    const [selectedPO, setSelectedPO] = useState<PendingPO | null>(null);
    const [selectedVendor, setSelectedVendor] = useState<Vendor | null>(null);


    // 全商品清單（用於雜項入庫/其他類型的 SearchableSelect）
    const [allProducts, setAllProducts] = useState<any[]>([]);
    const [isLoadingProducts, setIsLoadingProducts] = useState(false);

    // Duplicate Check States
    const [warningOpen, setWarningOpen] = useState(false);
    const [warnings, setWarnings] = useState<any[]>([]);
    const [isCheckingDuplicate, setIsCheckingDuplicate] = useState(false);

    const { data, setData, processing, errors } = useForm({
        type: receipt?.type || 'standard',
        warehouse_id: receipt?.warehouse_id?.toString() || '',
        purchase_order_id: receipt?.purchase_order_id?.toString() || '',
        vendor_id: receipt?.vendor_id?.toString() || '',
        received_date: receipt?.received_date || new Date().toISOString().split('T')[0],
        remarks: receipt?.remarks || '',
        items: (receipt?.items || []) as any[],
    });

    // 編輯模式下初始化 vendor 與 PO 狀態
    useEffect(() => {
        if (isEditMode) {
            if (receipt?.vendor) {
                setSelectedVendor(receipt.vendor);
            }
            if (receipt?.purchase_order) {
                setSelectedPO(receipt.purchase_order);
            }
        }
    }, []);

    // 判斷是否為非標準採購類型
    const isNonStandard = data.type !== 'standard';



    // 載入所有商品（用於雜項入庫/其他類型的 SearchableSelect）
    const fetchAllProducts = async () => {
        setIsLoadingProducts(true);
        try {
            const response = await axios.get(route('goods-receipts.search-products'), {
                params: { query: '*' },
            });
            setAllProducts(response.data);
        } catch (error) {
            console.error('Failed to load products', error);
        } finally {
            setIsLoadingProducts(false);
        }
    };

    // 當選擇非標準類型且已選供應商時，載入所有商品
    useEffect(() => {
        if (isNonStandard && selectedVendor) {
            fetchAllProducts();
        }
    }, [isNonStandard, selectedVendor]);

    // 選擇採購單
    const handleSelectPO = (po: PendingPO) => {
        setSelectedPO(po);
        // 將採購單項目轉換為進貨單項目，預填剩餘可收貨量
        const pendingItems = po.items.map((item) => ({
            product_id: item.product_id,
            purchase_order_item_id: item.id,
            product_name: item.product_name,
            product_code: item.product_code,
            unit: item.unit,
            quantity_ordered: item.quantity,
            quantity_received_so_far: item.received_quantity,
            quantity_received: item.remaining, // 預填剩餘量
            unit_price: item.unit_price,
            batch_number: '',
            batchMode: 'new',
            originCountry: 'TW',
            expiry_date: '',
        }));

        setData((prev) => ({
            ...prev,
            purchase_order_id: po.id.toString(),
            vendor_id: po.vendor_id.toString(),
            warehouse_id: po.warehouse_id ? po.warehouse_id.toString() : prev.warehouse_id,
            items: pendingItems,
        }));
    };

    // 選擇廠商（雜項入庫/其他）
    const handleSelectVendor = (vendorId: string) => {
        const vendor = vendors.find(v => v.id.toString() === vendorId);
        if (vendor) {
            setSelectedVendor(vendor);
            setData('vendor_id', vendor.id.toString());
        }
    };


    const handleAddEmptyItem = () => {
        const newItem = {
            product_id: '',
            product_name: '',
            product_code: '',
            quantity_received: 0,
            unit_price: 0,
            subtotal: 0,
            batch_number: '',
            batchMode: 'new',
            originCountry: 'TW',
            expiry_date: '',
        };
        setData('items', [...data.items, newItem]);
    };

    // 選擇商品後填入該列（用於空白列的 SearchableSelect）
    const handleSelectProduct = (index: number, productId: string) => {
        const product = allProducts.find(p => p.id.toString() === productId);
        if (product) {
            const newItems = [...data.items];
            newItems[index] = {
                ...newItems[index],
                product_id: product.id,
                product_name: product.name,
                product_code: product.code,
                unit_price: product.price || 0,
            };
            setData('items', newItems);
        }
    };

    const removeItem = (index: number) => {
        const newItems = [...data.items];
        newItems.splice(index, 1);
        setData('items', newItems);
    };

    const updateItem = (index: number, field: string, value: any) => {
        const newItems = [...data.items];
        const item = { ...newItems[index], [field]: value };

        const qty = parseFloat(item.quantity_received) || 0;
        const price = parseFloat(item.unit_price) || 0;
        const subtotal = parseFloat(item.subtotal) || 0;

        if (field === 'quantity_received') {
            // 修改數量 -> 更新小計 (保持單價)
            item.subtotal = (qty * price).toString();
        } else if (field === 'unit_price') {
            // 修改單價 -> 更新小計 (價格 * 數量)
            item.subtotal = (qty * price).toString();
        } else if (field === 'subtotal') {
            // 修改小計 -> 更新單價 (小計 / 數量)
            if (qty > 0) {
                item.unit_price = (subtotal / qty).toString();
            }
        }

        newItems[index] = item;
        setData('items', newItems);
    };

    // Generate batch preview (Added)
    const getBatchPreview = (productId: number, productCode: string, country: string, dateStr: string) => {
        if (!productCode || !productId) return "--";
        try {
            const datePart = dateStr.includes('T') ? dateStr.split('T')[0] : dateStr;
            const [yyyy, mm, dd] = datePart.split('-');
            const dateFormatted = `${yyyy}${mm}${dd}`;

            const seqKey = `${productId}-${country}-${datePart}`;
            // Handle sequence. Note: nextSequences values are numbers.
            const seq = nextSequences[seqKey]?.toString().padStart(2, '0') || "01";

            return `${productCode}-${country}-${dateFormatted}-${seq}`;
        } catch (e) {
            return "--";
        }
    };

    // Batch management
    const [nextSequences, setNextSequences] = useState<Record<string, number>>({});

    // Fetch batches and sequence for a product
    const fetchProductBatches = async (productId: number, country: string = 'TW', dateStr: string = '') => {
        if (!data.warehouse_id) return;
        // const cacheKey = `${productId}-${data.warehouse_id}`; // Unused

        try {
            const today = new Date().toISOString().split('T')[0];
            const targetDate = dateStr || data.received_date || today;

            // Adjust API endpoint to match AddInventory logic
            // Assuming GoodsReceiptController or existing WarehouseController can handle this.
            // Using the same endpoint as AddInventory: /api/warehouses/{id}/inventory/batches/{productId}
            const response = await axios.get(
                `/api/warehouses/${data.warehouse_id}/inventory/batches/${productId}`,
                {
                    params: {
                        origin_country: country,
                        arrivalDate: targetDate
                    }
                }
            );

            if (response.data) {
                // Remove unused batch cache update

                // Update next sequence for new batch generation
                if (response.data.nextSequence !== undefined) {
                    const seqKey = `${productId}-${country}-${targetDate}`;
                    setNextSequences(prev => ({
                        ...prev,
                        [seqKey]: parseInt(response.data.nextSequence)
                    }));
                }
            }
        } catch (error) {
            console.error("Failed to fetch batches", error);
        }
    };

    // Trigger batch fetch when relevant fields change
    useEffect(() => {
        data.items.forEach(item => {
            if (item.product_id && data.warehouse_id) {
                const country = item.originCountry || 'TW';
                const date = data.received_date;
                fetchProductBatches(item.product_id, country, date);
            }
        });
    }, [data.items.length, data.warehouse_id, data.received_date, JSON.stringify(data.items.map(i => i.originCountry))]);

    useEffect(() => {
        data.items.forEach((item, index) => {
            if (item.batchMode === 'none') {
                if (item.batch_number !== 'NO-BATCH') {
                    const newItems = [...data.items];
                    newItems[index].batch_number = 'NO-BATCH';
                    setData('items', newItems);
                }
            } else if (item.batchMode === 'new' && item.originCountry && data.received_date) {
                const country = item.originCountry;
                // Use date from form or today
                const dateStr = data.received_date || new Date().toISOString().split('T')[0];
                const seqKey = `${item.product_id}-${country}-${dateStr}`;
                const seq = nextSequences[seqKey]?.toString().padStart(3, '0') || '001';

                const datePart = dateStr.replace(/-/g, '');
                const generatedBatch = `${item.product_code}-${country}-${datePart}-${seq}`;

                if (item.batch_number !== generatedBatch) {
                    const newItems = [...data.items];
                    newItems[index].batch_number = generatedBatch;
                    setData('items', newItems);
                }
            }
        });
    }, [nextSequences, JSON.stringify(data.items.map(i => ({ m: i.batchMode, c: i.originCountry, s: i.product_code, p: i.product_id }))), data.received_date]);

    const submit = async (e: React.FormEvent, force: boolean = false) => {
        if (e) e.preventDefault();

        // 格式化日期數據
        const formattedItems = data.items.map(item => ({
            ...item,
            expiry_date: item.expiry_date && item.expiry_date.includes('T')
                ? item.expiry_date.split('T')[0]
                : item.expiry_date
        }));

        const formattedDate = data.received_date.includes('T')
            ? data.received_date.split('T')[0]
            : data.received_date;

        // 建立一個臨時的提交資料對象
        const submitData = {
            ...data,
            received_date: formattedDate,
            items: formattedItems
        };

        // 編輯模式直接 PUT 更新
        if (isEditMode) {
            // 使用 router.put 因為 useForm 的 put 不支援傳入自定義 data 物件而不影響 state
            // 或者先 setData 再 put，但 setData 是非同步的
            // 這裡採用在提交前手動傳遞格式化後的資料給 router
            router.put(route('goods-receipts.update', receipt!.id), submitData, {
                onSuccess: () => setWarningOpen(false),
            });
            return;
        }

        // 新增模式：先檢查重複
        if (!force) {
            setIsCheckingDuplicate(true);
            try {
                const response = await axios.post(route('goods-receipts.check-duplicate'), submitData);
                if (response.data.has_warnings) {
                    setWarnings(response.data.warnings);
                    setWarningOpen(true);
                    return;
                }
            } catch (error) {
                console.error("Duplicate check failed", error);
            } finally {
                setIsCheckingDuplicate(false);
            }
        }

        router.post(route('goods-receipts.store'), submitData, {
            onSuccess: () => setWarningOpen(false),
        });
    };



    return (
        <AuthenticatedLayout
            breadcrumbs={[
                { label: '供應鏈管理', href: '#' },
                { label: '進貨單管理', href: route('goods-receipts.index') },
                { label: isEditMode ? `編輯進貨單: ${receipt!.code}` : '新增進貨單', href: isEditMode ? route('goods-receipts.edit', receipt!.id) : route('goods-receipts.create'), isPage: true },
            ]}
        >
            <Head title={isEditMode ? `編輯進貨單 - ${receipt!.code}` : '新增進貨單'} />

            <div className="container mx-auto p-6 max-w-7xl">
                {/* Header */}
                <div className="mb-6">
                    <Link href={route('goods-receipts.index')}>
                        <Button variant="outline" type="button" className="gap-2 mb-4 w-fit button-outlined-primary" onClick={(e) => {
                            if (isEditMode) {
                                e.preventDefault();
                                window.history.back();
                            }
                        }}>
                            <ArrowLeft className="h-4 w-4" />
                            {isEditMode ? '返回' : '返回進貨單'}
                        </Button>
                    </Link>

                    <div className="mb-4">
                        <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                            <Package className="h-6 w-6 text-primary-main" />
                            {isEditMode ? `編輯進貨單: ${receipt!.code}` : '新增進貨單'}
                        </h1>
                        <p className="text-gray-500 mt-1">
                            {isEditMode ? '修改進貨單內容' : '建立新的進貨單並入庫'}
                        </p>
                    </div>
                </div>

                <div className="space-y-6">
                    {/* Step 0: Select Type */}
                    <div className="bg-white rounded-lg border shadow-sm p-6">
                        <Label className="text-sm font-bold mb-3 block">選擇單據類型</Label>
                        <div className="flex gap-4">
                            {[
                                { id: 'standard', label: '標準採購', desc: '從採購單帶入' },
                                { id: 'miscellaneous', label: '雜項入庫', desc: '非採購之入庫' },
                                { id: 'other', label: '其他', desc: '其他原因入庫' },
                            ].map((t) => (
                                <button
                                    key={t.id}
                                    onClick={() => {
                                        if (isEditMode) return; // 編輯模式禁止切換類型
                                        setData((prev) => ({
                                            ...prev,
                                            type: t.id,
                                            purchase_order_id: '',
                                            items: [],
                                            vendor_id: t.id === 'standard' ? prev.vendor_id : '',
                                        }));
                                        setSelectedPO(null);
                                        if (t.id !== 'standard') setSelectedVendor(null);
                                    }}
                                    disabled={isEditMode}
                                    className={`flex-1 p-4 rounded-xl border-2 text-left transition-all ${data.type === t.id
                                        ? 'border-primary-main bg-primary-main/5'
                                        : 'border-gray-100 hover:border-gray-200'
                                        } ${isEditMode ? 'cursor-not-allowed opacity-60' : ''}`}
                                >
                                    <div className={`font-bold ${data.type === t.id ? 'text-primary-main' : 'text-gray-700'}`}>
                                        {t.label}
                                    </div>
                                    <div className="text-xs text-gray-500">{t.desc}</div>
                                </button>
                            ))}
                        </div>
                    </div>

                    {/* Step 1: Source Selection */}
                    <div className="bg-white rounded-lg border shadow-sm overflow-hidden">
                        <div className="p-6 bg-gray-50/50 border-b flex items-center gap-3">
                            <div className={`w-8 h-8 rounded-full flex items-center justify-center font-bold text-sm ${(data.type === 'standard' ? !!selectedPO : !!selectedVendor)
                                ? 'bg-green-500 text-white shadow-sm' : 'bg-primary-main text-white shadow-sm'}`}>
                                {(data.type === 'standard' ? selectedPO : selectedVendor) ? '✓' : '1'}
                            </div>
                            <h2 className="text-lg font-bold text-gray-800">
                                {data.type === 'standard' ? '選擇來源採購單' : '選擇供應商'}
                            </h2>
                        </div>

                        <div className="p-6">
                            {data.type === 'standard' ? (
                                !selectedPO ? (
                                    <div className="space-y-4">
                                        <Label className="text-sm font-medium text-gray-700">請選擇待進貨的採購單</Label>

                                        {pendingPurchaseOrders.length === 0 ? (
                                            <div className="text-center py-8 text-gray-500 bg-gray-50 rounded-lg border border-dashed">
                                                目前沒有待進貨的採購單
                                            </div>
                                        ) : (
                                            <div className="bg-white rounded-xl border border-gray-200 shadow-sm overflow-hidden">
                                                <Table>
                                                    <TableHeader className="bg-gray-50">
                                                        <TableRow>
                                                            <TableHead>採購單號</TableHead>
                                                            <TableHead>供應商</TableHead>
                                                            <TableHead className="text-center">狀態</TableHead>
                                                            <TableHead className="text-center">待收項目</TableHead>
                                                            <TableHead className="w-[100px] text-center">操作</TableHead>
                                                        </TableRow>
                                                    </TableHeader>
                                                    <TableBody>
                                                        {pendingPurchaseOrders.map((po) => (
                                                            <TableRow key={po.id} className="hover:bg-gray-50/50">
                                                                <TableCell className="font-medium text-primary-main">{po.code}</TableCell>
                                                                <TableCell>{po.vendor_name}</TableCell>
                                                                <TableCell className="text-center">
                                                                    <StatusBadge variant={STATUS_CONFIG[po.status]?.variant || 'neutral'}>
                                                                        {STATUS_CONFIG[po.status]?.label || po.status}
                                                                    </StatusBadge>
                                                                </TableCell>
                                                                <TableCell className="text-center text-gray-600">
                                                                    {po.items.length} 項
                                                                </TableCell>
                                                                <TableCell className="text-center">
                                                                    <Button size="sm" onClick={() => handleSelectPO(po)} className="button-filled-primary">
                                                                        選擇
                                                                    </Button>
                                                                </TableCell>
                                                            </TableRow>
                                                        ))}
                                                    </TableBody>
                                                </Table>
                                            </div>
                                        )}
                                    </div>
                                ) : (
                                    <div className="flex items-center justify-between bg-primary-main/5 p-4 rounded-xl border border-primary-main/20">
                                        <div className="flex gap-8">
                                            <div>
                                                <span className="text-xs text-gray-500 block">已選採購單</span>
                                                <span className="font-bold text-primary-main">{selectedPO.code}</span>
                                            </div>
                                            <div>
                                                <span className="text-xs text-gray-500 block">供應商</span>
                                                <span className="font-bold text-gray-800">{selectedPO.vendor_name}</span>
                                            </div>
                                            <div>
                                                <span className="text-xs text-gray-500 block">待收項目</span>
                                                <span className="font-bold text-gray-800">{selectedPO.items.length} 項</span>
                                            </div>
                                        </div>
                                        {!isEditMode && (
                                            <Button variant="ghost" size="sm" onClick={() => setSelectedPO(null)} className="text-gray-500 hover:text-red-500">
                                                重新選擇
                                            </Button>
                                        )}
                                    </div>
                                )
                            ) : (
                                !selectedVendor ? (
                                    <div className="space-y-4">
                                        <div className="space-y-2">
                                            <Label className="text-sm font-medium text-gray-700">請選擇供應商</Label>
                                            <SearchableSelect
                                                value=""
                                                onValueChange={handleSelectVendor}
                                                options={vendors.map(v => ({
                                                    label: `${v.name} (${v.code})`,
                                                    value: v.id.toString()
                                                }))}
                                                placeholder="選擇供應商..."
                                                searchPlaceholder="搜尋供應商..."
                                                className="h-9 w-full max-w-md"
                                            />
                                        </div>
                                        {vendors.length === 0 && (
                                            <div className="text-center py-8 text-gray-500 bg-gray-50 rounded-lg border border-dashed">
                                                目前沒有可選擇的供應商
                                            </div>
                                        )}
                                    </div>
                                ) : (
                                    <div className="flex items-center justify-between bg-primary-main/5 p-4 rounded-xl border border-primary-main/20">
                                        <div className="flex gap-8">
                                            <div>
                                                <span className="text-xs text-gray-500 block">已選供應商</span>
                                                <span className="font-bold text-primary-main">{selectedVendor.name}</span>
                                            </div>
                                            <div>
                                                <span className="text-xs text-gray-500 block">供應商代號</span>
                                                <span className="font-bold text-gray-800">{selectedVendor.code}</span>
                                            </div>
                                        </div>
                                        {!isEditMode && (
                                            <Button variant="ghost" size="sm" onClick={() => setSelectedVendor(null)} className="text-gray-500 hover:text-red-500">
                                                重新選擇
                                            </Button>
                                        )}
                                    </div>
                                )
                            )}
                        </div>
                    </div>

                    {/* Step 2: Details & Items */}
                    {(isEditMode || (data.type === 'standard' && selectedPO) || (data.type !== 'standard' && selectedVendor)) && (
                        <div className="bg-white rounded-lg border shadow-sm overflow-hidden animate-in fade-in slide-in-from-bottom-4 duration-500">
                            <div className="p-6 bg-gray-50/50 border-b flex items-center gap-3">
                                <div className="w-8 h-8 rounded-full bg-primary-main text-white flex items-center justify-center font-bold text-sm shadow-sm">2</div>
                                <h2 className="text-lg font-bold text-gray-800">進貨資訊與明細</h2>
                            </div>

                            <div className="p-6 space-y-8">
                                <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
                                    <div className="space-y-2">
                                        <Label htmlFor="warehouse_id">收貨倉庫 <span className="text-red-500">*</span></Label>
                                        <Select
                                            value={data.warehouse_id}
                                            onValueChange={(val) => setData('warehouse_id', val)}
                                        >
                                            <SelectTrigger className="h-9">
                                                <SelectValue placeholder="選擇倉庫" />
                                            </SelectTrigger>
                                            <SelectContent>
                                                {warehouses.map(w => (
                                                    <SelectItem key={w.id} value={w.id.toString()}>{w.name} ({w.type})</SelectItem>
                                                ))}
                                            </SelectContent>
                                        </Select>
                                        {errors.warehouse_id && <p className="text-red-500 text-xs">{errors.warehouse_id}</p>}
                                    </div>
                                    <div className="space-y-2">
                                        <Label htmlFor="received_date">進貨日期 <span className="text-red-500">*</span></Label>
                                        <div className="relative">
                                            <CalendarIcon className="absolute left-2.5 top-2.5 h-4 w-4 text-gray-400 pointer-events-none" />
                                            <Input
                                                type="date"
                                                value={data.received_date}
                                                onChange={(e) => setData('received_date', e.target.value)}
                                                className="pl-9 h-9 block w-full"
                                            />
                                        </div>
                                        {errors.received_date && <p className="text-red-500 text-xs">{errors.received_date}</p>}
                                    </div>
                                    <div className="space-y-2">
                                        <Label htmlFor="remarks">備註</Label>
                                        <Input
                                            value={data.remarks}
                                            onChange={(e) => setData('remarks', e.target.value)}
                                            className="h-9"
                                            placeholder="選填..."
                                        />
                                    </div>
                                </div>

                                <div className="space-y-4">
                                    <div className="flex items-center justify-between">
                                        <h3 className="font-bold text-gray-700">商品明細</h3>
                                        {isNonStandard && (
                                            <Button
                                                onClick={handleAddEmptyItem}
                                                className="button-filled-primary h-10 gap-2"
                                            >
                                                <Plus className="h-4 w-4" /> 新增品項
                                            </Button>
                                        )}
                                    </div>

                                    {/* Calculated Totals for usage in Table Footer or Summary */}
                                    {(() => {
                                        const subTotal = data.items.reduce((acc, item) => {
                                            if (isNonStandard) {
                                                // 非標準類型：使用手動輸入的小計
                                                return acc + (parseFloat(item.subtotal) || 0);
                                            }
                                            // 標準類型：自動計算 qty × price
                                            const qty = parseFloat(item.quantity_received) || 0;
                                            const price = parseFloat(item.unit_price) || 0;
                                            return acc + (qty * price);
                                        }, 0);
                                        const taxAmount = Math.round(subTotal * 0.05);
                                        const grandTotal = subTotal + taxAmount;

                                        return (
                                            <>
                                                <div className="bg-white rounded-xl border border-gray-200 shadow-sm overflow-hidden">
                                                    <Table>
                                                        <TableHeader className="bg-gray-50/50">
                                                            <TableRow>
                                                                <TableHead className={isNonStandard ? 'w-[220px]' : 'w-[180px]'}>商品資訊</TableHead>
                                                                {!isNonStandard && (
                                                                    <>
                                                                        <TableHead className="w-[80px] text-center">總數量</TableHead>
                                                                        <TableHead className="w-[80px] text-center">待收貨</TableHead>
                                                                    </>
                                                                )}
                                                                <TableHead className="w-[120px]">{isNonStandard ? '數量' : '本次收貨'} <span className="text-red-500">*</span></TableHead>
                                                                {isNonStandard && (
                                                                    <TableHead className="w-[100px]">單價</TableHead>
                                                                )}
                                                                <TableHead className="w-[200px]">批號設定 <span className="text-red-500">*</span></TableHead>
                                                                <TableHead className="w-[150px]">效期</TableHead>
                                                                <TableHead className={isNonStandard ? 'w-[120px]' : 'w-[80px] text-right'}>小計{isNonStandard && <> <span className="text-red-500">*</span></>}</TableHead>
                                                                <TableHead className="w-[50px]"></TableHead>
                                                            </TableRow>
                                                        </TableHeader>
                                                        <TableBody>
                                                            {data.items.length === 0 ? (
                                                                <TableRow>
                                                                    <TableCell colSpan={isNonStandard ? 6 : 8} className="text-center py-8 text-gray-400 italic">
                                                                        {isNonStandard ? '尚無明細，請點擊「新增品項」加入。' : '尚無明細，請搜尋商品加入。'}
                                                                    </TableCell>
                                                                </TableRow>
                                                            ) : (
                                                                data.items.map((item, index) => {
                                                                    const errorKey = `items.${index}.quantity_received` as keyof typeof errors;
                                                                    const itemTotal = (parseFloat(item.quantity_received || 0) * parseFloat(item.unit_price || 0));

                                                                    return (
                                                                        <TableRow key={index} className="hover:bg-gray-50/50 text-sm">
                                                                            {/* Product Info */}
                                                                            <TableCell>
                                                                                {isNonStandard && !item.product_id ? (
                                                                                    <SearchableSelect
                                                                                        value=""
                                                                                        onValueChange={(val) => handleSelectProduct(index, val)}
                                                                                        options={allProducts.map(p => ({
                                                                                            label: `${p.name} (${p.code})`,
                                                                                            value: p.id.toString()
                                                                                        }))}
                                                                                        placeholder={isLoadingProducts ? '載入中...' : '選擇商品...'}
                                                                                        searchPlaceholder="搜尋商品名稱或代碼..."
                                                                                        className="w-full"
                                                                                    />
                                                                                ) : (
                                                                                    <div className="flex flex-col">
                                                                                        <span className="font-medium text-gray-900">{item.product_name}</span>
                                                                                        <span className="text-xs text-gray-500">{item.product_code}</span>
                                                                                    </div>
                                                                                )}
                                                                            </TableCell>

                                                                            {/* Total Quantity & Remaining - 僅標準採購顯示 */}
                                                                            {!isNonStandard && (
                                                                                <>
                                                                                    <TableCell className="text-center">
                                                                                        <span className="text-gray-500 text-sm">
                                                                                            {Math.round(item.quantity_ordered)}
                                                                                        </span>
                                                                                    </TableCell>
                                                                                    <TableCell className="text-center">
                                                                                        <span className="text-gray-900 font-medium text-sm">
                                                                                            {Math.round(item.quantity_ordered - item.quantity_received_so_far)}
                                                                                        </span>
                                                                                    </TableCell>
                                                                                </>
                                                                            )}

                                                                            {/* Received Quantity */}
                                                                            <TableCell>
                                                                                <Input
                                                                                    type="number"
                                                                                    step="any"
                                                                                    min="0"
                                                                                    value={item.quantity_received}
                                                                                    onChange={(e) => updateItem(index, 'quantity_received', e.target.value)}
                                                                                    className={`w-full text-right ${errors && (errors as any)[errorKey] ? 'border-red-500' : ''}`}
                                                                                />
                                                                                {(errors as any)[errorKey] && (
                                                                                    <p className="text-xs text-red-500 mt-1">{(errors as any)[errorKey]}</p>
                                                                                )}
                                                                            </TableCell>

                                                                            {/* Unit Price - 僅非標準類型顯示 */}
                                                                            {isNonStandard && (
                                                                                <TableCell>
                                                                                    <Input
                                                                                        type="number"
                                                                                        step="any"
                                                                                        min="0"
                                                                                        value={item.unit_price || ''}
                                                                                        onChange={(e) => updateItem(index, 'unit_price', e.target.value)}
                                                                                        className="w-full text-right"
                                                                                        placeholder="0"
                                                                                    />
                                                                                </TableCell>
                                                                            )}

                                                                            {/* Batch Settings */}
                                                                            <TableCell>
                                                                                <div className="flex flex-col gap-2">
                                                                                    {/* 統一批號選擇器 */}
                                                                                    <SearchableSelect
                                                                                        value={item.batchMode === 'none' ? 'no_batch' : (item.batchMode === 'new' ? 'new_batch' : (item.inventory_id || ""))}
                                                                                        onValueChange={(value) => {
                                                                                            if (value === 'new_batch') {
                                                                                                const updatedItem = {
                                                                                                    ...item,
                                                                                                    batchMode: 'new',
                                                                                                    inventory_id: undefined,
                                                                                                    originCountry: 'TW',
                                                                                                    expiry_date: '',
                                                                                                };
                                                                                                const newItems = [...data.items];
                                                                                                newItems[index] = updatedItem;
                                                                                                setData('items', newItems);
                                                                                            } else if (value === 'no_batch') {
                                                                                                const updatedItem = {
                                                                                                    ...item,
                                                                                                    batchMode: 'none',
                                                                                                    batch_number: 'NO-BATCH',
                                                                                                    inventory_id: undefined,
                                                                                                    originCountry: 'TW',
                                                                                                    expiry_date: '',
                                                                                                };
                                                                                                const newItems = [...data.items];
                                                                                                newItems[index] = updatedItem;
                                                                                                setData('items', newItems);
                                                                                            } else {
                                                                                                // 選擇現有批號 (如果有快照的話，目前架構下先保留 basic 選項)
                                                                                                updateItem(index, 'batchMode', 'existing');
                                                                                                updateItem(index, 'inventory_id', value);
                                                                                            }
                                                                                        }}
                                                                                        options={[
                                                                                            { label: "📦 不使用批號 (自動累加)", value: "no_batch" },
                                                                                            { label: "+ 建立新批號", value: "new_batch" },
                                                                                            // 若有現有批號列表可在此擴充，目前進貨單主要處理 new/none
                                                                                        ]}
                                                                                        placeholder="選擇或建立批號"
                                                                                        className="border-gray-200"
                                                                                    />

                                                                                    {/* 建立新批號時的附加欄位 */}
                                                                                    {item.batchMode === 'new' && (
                                                                                        <div className="flex items-center gap-2">
                                                                                            <Input
                                                                                                value={item.originCountry || 'TW'}
                                                                                                onChange={(e) => updateItem(index, 'originCountry', e.target.value.toUpperCase().slice(0, 2))}
                                                                                                placeholder="產地"
                                                                                                maxLength={2}
                                                                                                className="w-12 h-8 text-center px-1 text-xs"
                                                                                            />
                                                                                            <div className="flex-1 text-[10px] font-mono px-2 py-1.5 rounded truncate bg-primary-50 text-primary-main border border-primary-100 flex items-center">
                                                                                                {getBatchPreview(item.product_id, item.product_code, item.originCountry || 'TW', data.received_date)}
                                                                                            </div>
                                                                                        </div>
                                                                                    )}

                                                                                    {/* 不使用批號時的提示 */}
                                                                                    {item.batchMode === 'none' && (
                                                                                        <p className="text-[10px] text-amber-600 bg-amber-50/50 px-2 py-1 rounded border border-amber-100/50">
                                                                                            系統將自動累計至該商品的通用庫存紀錄
                                                                                        </p>
                                                                                    )}
                                                                                </div>
                                                                            </TableCell>

                                                                            {/* Expiry Date */}
                                                                            <TableCell>
                                                                                <div className="relative">
                                                                                    <CalendarIcon className="absolute left-2.5 top-2.5 h-4 w-4 text-gray-400 pointer-events-none" />
                                                                                    <Input
                                                                                        type="date"
                                                                                        value={item.expiry_date}
                                                                                        onChange={(e) => updateItem(index, 'expiry_date', e.target.value)}
                                                                                        className={`pl-9 ${item.batchMode === 'existing' ? 'bg-gray-50' : ''}`}
                                                                                        disabled={item.batchMode === 'existing'}
                                                                                    />
                                                                                </div>
                                                                            </TableCell>

                                                                            {/* Subtotal */}
                                                                            <TableCell className={isNonStandard ? '' : 'text-right font-medium'}>
                                                                                {isNonStandard ? (
                                                                                    <Input
                                                                                        type="number"
                                                                                        step="any"
                                                                                        min="0"
                                                                                        value={item.subtotal || ''}
                                                                                        onChange={(e) => updateItem(index, 'subtotal', e.target.value)}
                                                                                        className="w-full text-right"
                                                                                        placeholder="0"
                                                                                    />
                                                                                ) : (
                                                                                    <span>${itemTotal.toLocaleString()}</span>
                                                                                )}
                                                                            </TableCell>

                                                                            {/* Actions */}
                                                                            <TableCell>
                                                                                <Button
                                                                                    type="button"
                                                                                    variant="ghost"
                                                                                    size="icon"
                                                                                    onClick={() => removeItem(index)}
                                                                                    className="hover:bg-red-50 hover:text-red-600 h-8 w-8"
                                                                                >
                                                                                    <Trash2 className="h-4 w-4" />
                                                                                </Button>
                                                                            </TableCell>
                                                                        </TableRow>
                                                                    );
                                                                })
                                                            )}
                                                        </TableBody>
                                                    </Table>
                                                </div>

                                                <div className="mt-6 flex justify-end">
                                                    <div className="w-full max-w-sm bg-primary/5 px-6 py-4 rounded-xl border border-primary/10 flex flex-col gap-3">
                                                        <div className="flex justify-between items-center w-full">
                                                            <span className="text-sm text-gray-500 font-medium">小計</span>
                                                            <span className="text-lg font-bold text-gray-700">${subTotal.toLocaleString()}</span>
                                                        </div>

                                                        <div className="flex justify-between items-center w-full">
                                                            <span className="text-sm text-gray-500 font-medium">稅額 (5%)</span>
                                                            <span className="text-lg font-bold text-gray-700">${taxAmount.toLocaleString()}</span>
                                                        </div>

                                                        <div className="h-px bg-primary/10 w-full my-1"></div>

                                                        <div className="flex justify-between items-end w-full">
                                                            <span className="text-sm text-gray-500 font-medium mb-1">總計金額</span>
                                                            <span className="text-2xl font-black text-primary">
                                                                ${grandTotal.toLocaleString()}
                                                            </span>
                                                        </div>
                                                    </div>
                                                </div>
                                            </>
                                        );
                                    })()}
                                </div>
                            </div>
                        </div>
                    )}
                </div>

                {/* Bottom Action Bar */}
                <div className="flex items-center justify-end gap-4 py-6 border-t border-gray-100 mt-6">
                    <Button variant="ghost" className="h-11 px-6 text-gray-500 hover:text-gray-700" onClick={() => window.history.back()}>
                        取消
                    </Button>
                    <Button
                        size="lg"
                        className="button-filled-primary px-12 h-14 rounded-xl shadow-lg text-lg font-bold transition-all hover:scale-[1.02] active:scale-[0.98]"
                        onClick={submit}
                        disabled={processing || isCheckingDuplicate || (!isEditMode && (data.type === 'standard' ? !selectedPO : !selectedVendor))}
                    >
                        <Save className="mr-2 h-5 w-5" />
                        {processing || isCheckingDuplicate ? '處理中...' : (isEditMode ? '儲存變更' : '確認進貨')}
                    </Button>
                </div>
            </div>

            <DuplicateWarningDialog
                open={warningOpen}
                onClose={() => setWarningOpen(false)}
                onConfirm={() => submit(null as any, true)}
                warnings={warnings}
                processing={processing}
            />
        </AuthenticatedLayout >
    );
}
