/**
 * 生產工單詳情頁面
 * 含追溯資訊：成品批號 → 原物料批號 → 來源採購單
 */

import { Factory, ArrowLeft, Package, Calendar, User, Warehouse, FileText, Link2, Send, CheckCircle2, PlayCircle, Ban, ArrowRightCircle } from 'lucide-react';
import { formatQuantity } from "@/lib/utils";
import { Button } from "@/Components/ui/button";
import AuthenticatedLayout from "@/Layouts/AuthenticatedLayout";
import { Head, Link, useForm, router } from "@inertiajs/react";
import { getBreadcrumbs } from "@/utils/breadcrumb";
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/Components/ui/table";
import { StatusBadge } from "@/Components/shared/StatusBadge";
import ProductionOrderStatusBadge from '@/Components/ProductionOrder/ProductionOrderStatusBadge';
import { ProductionStatusProgressBar } from '@/Components/ProductionOrder/ProductionStatusProgressBar';
import { PRODUCTION_ORDER_STATUS, ProductionOrderStatus } from '@/constants/production-order';
import WarehouseSelectionModal from '@/Components/ProductionOrder/WarehouseSelectionModal';
import { useState } from 'react';
import { formatDate } from '@/lib/date';

interface Warehouse {
    id: number;
    name: string;
}

interface ProductionOrderItem {
    // ... (後面保持不變)
    id: number;
    quantity_used: number;
    unit?: { id: number; name: string } | null;
    inventory: {
        id: number;
        batch_number: string;
        box_number: string | null;
        arrival_date: string | null;
        origin_country: string | null;
        product: { id: number; name: string; code: string } | null;
        warehouse?: { id: number; name: string } | null;
        unit_cost?: number;
        source_purchase_order?: {
            id: number;
            code: string;
            vendor?: { id: number; name: string } | null;
        } | null;
    } | null;
}

interface ProductionOrder {
    id: number;
    code: string;
    product: { id: number; name: string; code: string; base_unit?: { name: string } | null } | null;
    product_id: number;
    warehouse: { id: number; name: string } | null;
    warehouse_id: number | null;
    user: { id: number; name: string } | null;
    output_batch_number: string;
    output_box_count: string | null;
    output_quantity: number;
    actual_output_quantity: number | null;
    loss_reason: string | null;
    production_date: string;
    expiry_date: string | null;
    status: ProductionOrderStatus;
    remark: string | null;
    created_at: string;
    items: ProductionOrderItem[];
}

interface Props {
    productionOrder: ProductionOrder;
    warehouses: Warehouse[];
    auth: {
        user: {
            id: number;
            name: string;
            roles: string[];
            permissions: string[];
        } | null;
    };
}

export default function ProductionShow({ productionOrder, warehouses, auth }: Props) {
    const [isWarehouseModalOpen, setIsWarehouseModalOpen] = useState(false);
    const { processing } = useForm({
        status: '' as ProductionOrderStatus,
        warehouse_id: null as number | null,
    });

    const handleStatusUpdate = (newStatus: string, extraData?: {
        warehouseId?: number;
        batchNumber?: string;
        expiryDate?: string;
        actualOutputQuantity?: number;
        lossReason?: string;
    }) => {
        router.patch(route('production-orders.update-status', productionOrder.id), {
            status: newStatus,
            warehouse_id: extraData?.warehouseId,
            output_batch_number: extraData?.batchNumber,
            expiry_date: extraData?.expiryDate,
            actual_output_quantity: extraData?.actualOutputQuantity,
            loss_reason: extraData?.lossReason,
        }, {
            onSuccess: () => {
                setIsWarehouseModalOpen(false);
            },
            preserveScroll: true,
        });
    };

    const userPermissions = auth.user?.permissions || [];
    const hasPermission = (permission: string) => auth.user?.roles?.includes('super-admin') || userPermissions.includes(permission);

    // 權限判斷
    const canApprove = hasPermission('production_orders.approve');
    const canCancel = hasPermission('production_orders.cancel');
    const canEdit = hasPermission('production_orders.edit');

    // 計算總預估成本
    const totalEstimatedCost = productionOrder.items.reduce((sum, item) => {
        const qty = Number(item.quantity_used) || 0;
        const cost = Number(item.inventory?.unit_cost) || 0;
        return sum + (qty * cost);
    }, 0);

    return (
        <AuthenticatedLayout breadcrumbs={getBreadcrumbs("productionOrdersShow")}>
            <Head title={`生產單 ${productionOrder.code}`} />

            <WarehouseSelectionModal
                isOpen={isWarehouseModalOpen}
                onClose={() => setIsWarehouseModalOpen(false)}
                onConfirm={(data) => handleStatusUpdate(PRODUCTION_ORDER_STATUS.COMPLETED, data)}
                warehouses={warehouses}
                processing={processing}
                productCode={productionOrder.product?.code}
                productId={productionOrder.product?.id}
                outputQuantity={Number(productionOrder.output_quantity)}
                unitName={productionOrder.product?.base_unit?.name}
            />

            <div className="container mx-auto p-6 max-w-7xl animate-in fade-in duration-500">
                {/* Header 區塊 */}
                <div className="mb-6">
                    {/* 返回按鈕 (統一規範：標題上方，mb-4) */}
                    <Link href={route('production-orders.index')}>
                        <Button
                            variant="outline"
                            className="gap-2 button-outlined-primary mb-4"
                        >
                            <ArrowLeft className="h-4 w-4" />
                            返回列表
                        </Button>
                    </Link>

                    <div className="flex flex-wrap items-center justify-between gap-4">
                        <div>
                            <div className="flex items-center gap-3">
                                <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                                    <Factory className="h-6 w-6 text-primary-main" />
                                    生產工單：{productionOrder.code}
                                </h1>
                                <ProductionOrderStatusBadge status={productionOrder.status} />
                            </div>
                            <p className="text-gray-500 text-sm mt-1">
                                建立人員：{productionOrder.user?.name || '-'} | 建立時間：{formatDate(productionOrder.created_at)}
                            </p>
                        </div>

                        {/* 操作按鈕區 (統一規範樣式類別) */}
                        <div className="flex items-center gap-2">
                            {/* 草稿 -> 提交審核 */}
                            {productionOrder.status === PRODUCTION_ORDER_STATUS.DRAFT && (
                                <>
                                    {canEdit && (
                                        <Link href={route('production-orders.edit', productionOrder.id)}>
                                            <Button variant="outline" className="gap-2 button-outlined-primary">
                                                <FileText className="h-4 w-4" />
                                                編輯工單
                                            </Button>
                                        </Link>
                                    )}
                                    <Button
                                        onClick={() => handleStatusUpdate(PRODUCTION_ORDER_STATUS.PENDING)}
                                        className="gap-2 button-filled-primary"
                                    >
                                        <Send className="h-4 w-4" />
                                        送審工單
                                    </Button>
                                </>
                            )}

                            {/* 待審核 -> 核准 / 駁回 */}
                            {productionOrder.status === PRODUCTION_ORDER_STATUS.PENDING && canApprove && (
                                <>
                                    <Button
                                        variant="outline"
                                        onClick={() => handleStatusUpdate(PRODUCTION_ORDER_STATUS.DRAFT)}
                                        className="gap-2 button-outlined-error"
                                    >
                                        <ArrowLeft className="h-4 w-4" />
                                        退回草稿
                                    </Button>
                                    <Button
                                        onClick={() => handleStatusUpdate(PRODUCTION_ORDER_STATUS.APPROVED)}
                                        className="gap-2 button-filled-success"
                                    >
                                        <CheckCircle2 className="h-4 w-4" />
                                        核准工單
                                    </Button>
                                </>
                            )}

                            {/* 已核准 -> 開始製作 */}
                            {productionOrder.status === PRODUCTION_ORDER_STATUS.APPROVED && (
                                <Button
                                    onClick={() => handleStatusUpdate(PRODUCTION_ORDER_STATUS.IN_PROGRESS)}
                                    className="gap-2 button-filled-primary"
                                >
                                    <PlayCircle className="h-4 w-4" />
                                    開始製作 (扣除原料庫存)
                                </Button>
                            )}

                            {/* 製作中 -> 完成製作 */}
                            {productionOrder.status === PRODUCTION_ORDER_STATUS.IN_PROGRESS && (
                                <Button
                                    onClick={() => setIsWarehouseModalOpen(true)}
                                    className="gap-2 button-filled-primary"
                                >
                                    <ArrowRightCircle className="h-4 w-4" />
                                    製作完成 (成品入庫)
                                </Button>
                            )}

                            {/* 可作廢狀態 (非已完成/已作廢/草稿之外) */}
                            {!([PRODUCTION_ORDER_STATUS.COMPLETED, PRODUCTION_ORDER_STATUS.CANCELLED, PRODUCTION_ORDER_STATUS.DRAFT] as ProductionOrderStatus[]).includes(productionOrder.status) && canCancel && (
                                <Button
                                    variant="outline"
                                    onClick={() => {
                                        if (confirm('確定要作廢此生產工單嗎？此動作無法復原。')) {
                                            handleStatusUpdate(PRODUCTION_ORDER_STATUS.CANCELLED);
                                        }
                                    }}
                                    className="gap-2 button-outlined-error"
                                >
                                    <Ban className="h-4 w-4" />
                                    作廢工單
                                </Button>
                            )}
                        </div>
                    </div>
                </div>

                <div className="grid grid-cols-1 lg:grid-cols-3 gap-6 mb-6">
                    {/* 狀態進度條 */}
                    <div className="lg:col-span-3">
                        <ProductionStatusProgressBar currentStatus={productionOrder.status} />
                    </div>

                    {/* 成品資訊 (統一規範：bg-white rounded-xl border border-gray-200 shadow-sm p-6) */}
                    <div className="lg:col-span-2 space-y-6">
                        <div className="bg-white p-6 rounded-xl shadow-sm border border-gray-200 h-full">
                            <h2 className="text-lg font-semibold mb-6 flex items-center gap-2 text-grey-0">
                                <Package className="h-5 w-5 text-primary-main" />
                                成品資訊
                            </h2>
                            <div className="grid grid-cols-1 md:grid-cols-2 gap-x-8 gap-y-8">
                                <div className="space-y-1.5">
                                    <p className="text-xs font-semibold text-grey-2 uppercase tracking-wider">成品商品</p>
                                    <div>
                                        <p className="font-bold text-grey-0 text-lg">
                                            {productionOrder.product?.name || '-'}
                                        </p>
                                        <p className="text-gray-400 text-sm font-mono mt-0.5">
                                            {productionOrder.product?.code || '-'}
                                        </p>
                                    </div>
                                </div>
                                <div className="space-y-1.5">
                                    <p className="text-xs font-semibold text-grey-2 uppercase tracking-wider">生產批號</p>
                                    <p className="font-mono font-bold text-primary-main text-lg py-1 px-2 bg-primary-lightest rounded-md inline-block">
                                        {productionOrder.output_batch_number}
                                    </p>
                                </div>
                                <div className="space-y-1.5">
                                    <p className="text-xs font-semibold text-grey-2 uppercase tracking-wider">預計產量</p>
                                    <div className="flex items-baseline gap-1.5">
                                        <p className="font-bold text-grey-0 text-xl">
                                            {formatQuantity(productionOrder.output_quantity)}
                                        </p>
                                        {productionOrder.product?.base_unit?.name && (
                                            <span className="text-grey-2 font-medium">{productionOrder.product.base_unit.name}</span>
                                        )}
                                        {productionOrder.output_box_count && (
                                            <span className="text-grey-3 ml-2 text-sm">({productionOrder.output_box_count} 箱)</span>
                                        )}
                                    </div>
                                </div>
                                {/* 實際產量與耗損（僅完成狀態顯示） */}
                                {productionOrder.status === PRODUCTION_ORDER_STATUS.COMPLETED && productionOrder.actual_output_quantity != null && (
                                    <div className="space-y-1.5">
                                        <p className="text-xs font-semibold text-grey-2 uppercase tracking-wider">實際產量</p>
                                        <div className="flex items-baseline gap-1.5">
                                            <p className="font-bold text-grey-0 text-xl">
                                                {formatQuantity(productionOrder.actual_output_quantity)}
                                            </p>
                                            {productionOrder.product?.base_unit?.name && (
                                                <span className="text-grey-2 font-medium">{productionOrder.product.base_unit.name}</span>
                                            )}
                                            {Number(productionOrder.output_quantity) > Number(productionOrder.actual_output_quantity) && (
                                                <span className="ml-2 inline-flex items-center gap-1 px-2 py-0.5 rounded-full bg-orange-100 text-orange-700 text-xs font-bold border border-orange-200">
                                                    耗損 {formatQuantity(Number(productionOrder.output_quantity) - Number(productionOrder.actual_output_quantity))}
                                                </span>
                                            )}
                                        </div>
                                        {productionOrder.loss_reason && (
                                            <p className="text-xs text-orange-600 mt-1">原因：{productionOrder.loss_reason}</p>
                                        )}
                                    </div>
                                )}
                                <div className="space-y-1.5">
                                    <p className="text-xs font-semibold text-grey-2 uppercase tracking-wider">入庫倉庫</p>
                                    <div className="flex items-center gap-2 bg-grey-5 p-2 rounded-lg border border-grey-4">
                                        <Warehouse className="h-4 w-4 text-grey-3" />
                                        <p className="font-semibold text-grey-0">{productionOrder.warehouse?.name || (productionOrder.status === PRODUCTION_ORDER_STATUS.COMPLETED ? '系統錯誤' : '待選取')}</p>
                                    </div>
                                </div>
                            </div>

                            {productionOrder.remark && (
                                <div className="mt-8 pt-6 border-t border-grey-4 transition-all hover:bg-grey-5 p-2 rounded-lg">
                                    <div className="flex items-start gap-3">
                                        <FileText className="h-5 w-5 text-grey-3 mt-0.5" />
                                        <div>
                                            <p className="text-xs font-semibold text-grey-2 uppercase tracking-wider mb-1">備註資訊</p>
                                            <p className="text-grey-1 leading-relaxed">{productionOrder.remark}</p>
                                        </div>
                                    </div>
                                </div>
                            )}
                        </div>
                    </div>

                    {/* 次要資訊 */}
                    <div className="lg:col-span-1">
                        <div className="bg-white p-6 rounded-xl shadow-sm border border-gray-200 h-full space-y-8">
                            <h2 className="text-lg font-semibold flex items-center gap-2 text-grey-0">
                                <Calendar className="h-5 w-5 text-primary-main" />
                                時間與人員
                            </h2>

                            <div className="space-y-6">
                                <div className="flex items-start gap-4 p-3 rounded-lg bg-primary-lightest border border-primary-light/20">
                                    <Calendar className="h-5 w-5 text-primary-main mt-1" />
                                    <div>
                                        <p className="text-xs font-bold text-primary-main/60 uppercase">生產日期</p>
                                        <p className="font-bold text-grey-0 text-lg">{formatDate(productionOrder.production_date)}</p>
                                    </div>
                                </div>

                                <div className="flex items-start gap-4 p-3 rounded-lg bg-orange-50 border border-orange-100">
                                    <Calendar className="h-5 w-5 text-orange-600 mt-1" />
                                    <div>
                                        <p className="text-xs font-bold text-orange-900/50 uppercase">成品效期</p>
                                        <p className="font-bold text-orange-900 text-lg">{formatDate(productionOrder.expiry_date)}</p>
                                    </div>
                                </div>

                                <div className="flex items-start gap-4 p-3 rounded-lg bg-grey-5 border border-grey-4">
                                    <User className="h-5 w-5 text-grey-2 mt-1" />
                                    <div>
                                        <p className="text-xs font-bold text-grey-3 uppercase">執行人員</p>
                                        <p className="font-bold text-grey-1 text-lg">{productionOrder.user?.name || '-'}</p>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>

                {/* 原物料使用明細 (BOM) (統一規範：bg-white rounded-xl border border-gray-200 shadow-sm p-6) */}
                <div className="bg-white p-6 rounded-xl shadow-sm border border-gray-200 overflow-hidden mb-6">
                    <div className="flex items-center justify-between mb-6">
                        <h2 className="text-lg font-semibold flex items-center gap-2 text-grey-0">
                            <Link2 className="h-5 w-5 text-primary-main" />
                            原料耗用與追溯
                        </h2>
                        <StatusBadge variant="neutral" className="text-grey-3 font-medium">
                            共 {productionOrder.items.length} 項物料
                        </StatusBadge>
                    </div>

                    {productionOrder.items.length === 0 ? (
                        <div className="flex flex-col items-center justify-center py-16 text-grey-3 bg-grey-5 rounded-xl border-2 border-dashed border-grey-4">
                            <Package className="h-10 w-10 mb-4 opacity-20 text-grey-2" />
                            <p>無原物料消耗記錄</p>
                        </div>
                    ) : (
                        <div className="rounded-xl border border-grey-4 overflow-hidden shadow-sm">
                            <Table>
                                <TableHeader className="bg-grey-5/80 backdrop-blur-sm transition-colors">
                                    <TableRow className="hover:bg-transparent border-b-grey-4">
                                        <TableHead className="px-6 py-4 text-xs font-bold text-grey-2 uppercase tracking-widest leading-none">原物料</TableHead>
                                        <TableHead className="px-6 py-4 text-xs font-bold text-grey-2 uppercase tracking-widest leading-none">來源倉庫</TableHead>
                                        <TableHead className="px-6 py-4 text-xs font-bold text-grey-2 uppercase tracking-widest leading-none">使用批號</TableHead>
                                        <TableHead className="px-6 py-4 text-xs font-bold text-grey-2 uppercase tracking-widest leading-none text-center">來源國家</TableHead>
                                        <TableHead className="px-6 py-4 text-xs font-bold text-grey-2 uppercase tracking-widest leading-none">使用數量</TableHead>
                                        <TableHead className="px-6 py-4 text-xs font-bold text-grey-2 uppercase tracking-widest leading-none text-right">預估單價</TableHead>
                                        <TableHead className="px-6 py-4 text-xs font-bold text-grey-2 uppercase tracking-widest leading-none text-right">成本小計</TableHead>
                                        <TableHead className="px-6 py-4 text-xs font-bold text-grey-2 uppercase tracking-widest leading-none">來源單據</TableHead>
                                    </TableRow>
                                </TableHeader>
                                <TableBody>
                                    {productionOrder.items.map((item) => (
                                        <TableRow key={item.id} className="hover:bg-grey-5/80 transition-colors border-b-grey-4 last:border-0">
                                            <TableCell className="px-6 py-5">
                                                <div className="font-bold text-grey-0">{item.inventory?.product?.name || '-'}</div>
                                                <div className="text-grey-3 text-xs font-mono mt-1 px-1.5 py-0.5 bg-grey-5 border border-grey-4 rounded inline-block">
                                                    {item.inventory?.product?.code || '-'}
                                                </div>
                                            </TableCell>
                                            <TableCell className="px-6 py-5">
                                                <div className="text-grey-0 font-medium">{item.inventory?.warehouse?.name || '-'}</div>
                                            </TableCell>
                                            <TableCell className="px-6 py-5">
                                                <div className="font-mono font-bold text-primary-main bg-primary-lightest border border-primary-light/10 px-2 py-1 rounded inline-flex items-center gap-2">
                                                    {item.inventory?.batch_number || '-'}
                                                    {item.inventory?.box_number && (
                                                        <span className="text-primary-main/60 text-[10px] bg-white px-1 rounded shadow-sm">#{item.inventory.box_number}</span>
                                                    )}
                                                </div>
                                            </TableCell>
                                            <TableCell className="px-6 py-5 text-center">
                                                <span className="px-3 py-1 bg-grey-5 border border-grey-4 rounded-full text-xs font-bold text-grey-2">
                                                    {item.inventory?.origin_country || '-'}
                                                </span>
                                            </TableCell>
                                            <TableCell className="px-6 py-5">
                                                <div className="flex items-baseline gap-1">
                                                    <span className="font-bold text-grey-0 text-base">{formatQuantity(item.quantity_used)}</span>
                                                    {item.unit?.name && (
                                                        <span className="text-grey-3 text-xs font-medium uppercase">{item.unit.name}</span>
                                                    )}
                                                </div>
                                            </TableCell>
                                            <TableCell className="px-6 py-5 text-right">
                                                <div className="text-grey-0 font-medium">
                                                    {Number(item.inventory?.unit_cost || 0).toLocaleString(undefined, { maximumFractionDigits: 2 })} 元
                                                </div>
                                            </TableCell>
                                            <TableCell className="px-6 py-5 text-right">
                                                <div className="font-bold text-grey-900">
                                                    {(Number(item.quantity_used) * Number(item.inventory?.unit_cost || 0)).toLocaleString(undefined, { maximumFractionDigits: 2 })} 元
                                                </div>
                                            </TableCell>
                                            <TableCell className="px-6 py-5">
                                                {item.inventory?.source_purchase_order ? (
                                                    <div className="group flex flex-col">
                                                        <Link
                                                            href={route('purchase-orders.show', item.inventory.source_purchase_order.id)}
                                                            className="text-primary-main hover:text-primary-dark font-bold inline-flex items-center gap-1 group-hover:underline transition-all"
                                                        >
                                                            {item.inventory.source_purchase_order.code}
                                                            <ArrowLeft className="h-3 w-3 rotate-180 opacity-0 group-hover:opacity-100 transition-opacity" />
                                                        </Link>
                                                        {item.inventory.source_purchase_order.vendor && (
                                                            <span className="text-[10px] text-grey-3 font-bold uppercase tracking-tight mt-0.5 whitespace-nowrap overflow-hidden text-ellipsis max-w-[150px]">
                                                                {item.inventory.source_purchase_order.vendor.name}
                                                            </span>
                                                        )}
                                                    </div>
                                                ) : (
                                                    <span className="text-grey-4">—</span>
                                                )}
                                            </TableCell>
                                        </TableRow>
                                    ))}
                                </TableBody>
                            </Table>
                            <div className="bg-gray-50 p-6 border-t border-grey-4 flex justify-end">
                                <div className="min-w-[300px]">
                                    <div className="flex justify-between items-center mb-2">
                                        <span className="text-sm text-gray-600">生產單總預估成本</span>
                                        <span className="text-lg font-bold text-gray-900">{totalEstimatedCost.toLocaleString(undefined, { maximumFractionDigits: 2 })} 元</span>
                                    </div>
                                    <div className="flex justify-between items-center pt-2 border-t border-gray-200">
                                        <span className="text-sm font-medium text-gray-700">預估單位生產成本
                                            <span className="text-xs text-gray-500 ml-1">(共 {Number(productionOrder.output_quantity || 0).toLocaleString(undefined, { maximumFractionDigits: 4 })} 份)</span>
                                        </span>
                                        <span className="text-md font-bold text-primary-main">
                                            {(productionOrder.output_quantity > 0 ? totalEstimatedCost / productionOrder.output_quantity : 0).toLocaleString(undefined, { maximumFractionDigits: 2 })} 元
                                        </span>
                                    </div>
                                </div>
                            </div>
                        </div>
                    )}
                </div>
            </div>
        </AuthenticatedLayout>
    );
}