import AuthenticatedLayout from '@/Layouts/AuthenticatedLayout';
import { Link, Head } from '@inertiajs/react';
import { cn } from "@/lib/utils";
import {
    Package,
    Users,
    ShoppingCart,
    Warehouse as WarehouseIcon,
    AlertTriangle,
    Clock,
    TrendingUp,
    ChevronRight
} from 'lucide-react';

interface Stats {
    productsCount: number;
    vendorsCount: number;
    purchaseOrdersCount: number;
    warehousesCount: number;
    totalInventoryValue: number;
    pendingOrdersCount: number;
    lowStockCount: number;
}

interface Props {
    stats: Stats;
}

export default function Dashboard({ stats }: Props) {
    const cardData = [
        {
            label: '商品總數',
            value: stats.productsCount,
            icon: <Package className="h-6 w-6 text-primary-main" />,
            description: '目前系統中的商品種類',
            color: 'bg-primary-main/10',
        },
        {
            label: '合作廠商',
            value: stats.vendorsCount,
            icon: <Users className="h-6 w-6 text-blue-600" />,
            description: '已建立資料的供應商',
            color: 'bg-blue-50',
        },
        {
            label: '採購單據',
            value: stats.purchaseOrdersCount,
            icon: <ShoppingCart className="h-6 w-6 text-purple-600" />,
            description: '歷年累計採購單數量',
            color: 'bg-purple-50',
        },
        {
            label: '倉庫站點',
            value: stats.warehousesCount,
            icon: <WarehouseIcon className="h-6 w-6 text-orange-600" />,
            description: '目前營運中的倉庫環境',
            color: 'bg-orange-50',
        },
    ];

    const alertData = [
        {
            label: '待處理採購單',
            value: stats.pendingOrdersCount,
            icon: <Clock className="h-5 w-5" />,
            status: stats.pendingOrdersCount > 0 ? 'warning' : 'normal',
        },
        {
            label: '低庫存警示',
            value: stats.lowStockCount,
            icon: <AlertTriangle className="h-5 w-5" />,
            status: stats.lowStockCount > 0 ? 'error' : 'normal',
        },
    ];

    return (
        <AuthenticatedLayout>
            <Head title="控制台 - 小小冰室 ERP" />

            <div className="p-8 max-w-7xl mx-auto">
                <div className="mb-8">
                    <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                        <TrendingUp className="h-6 w-6 text-primary-main" />
                        系統總覽
                    </h1>
                    <p className="text-gray-500 mt-1">歡迎回來，這是您的小小冰室 ERP 營運數據概況。</p>
                </div>

                {/* 主要數據卡片 */}
                <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6 mb-10">
                    {cardData.map((card, index) => (
                        <div key={index} className="bg-white p-6 rounded-2xl border border-grey-4 shadow-sm hover:shadow-md transition-shadow">
                            <div className="flex items-start justify-between mb-4">
                                <div className={`p-3 rounded-xl ${card.color}`}>
                                    {card.icon}
                                </div>
                                <span className="text-xs font-medium text-grey-3 bg-grey-5 px-2 py-1 rounded-full border border-grey-4">
                                    統計中
                                </span>
                            </div>
                            <div>
                                <h3 className="text-grey-2 text-sm font-medium mb-1">{card.label}</h3>
                                <div className="flex items-baseline gap-2">
                                    <span className="text-2xl font-bold text-grey-0">{card.value}</span>
                                </div>
                                <p className="text-xs text-grey-3 mt-2">{card.description}</p>
                            </div>
                        </div>
                    ))}
                </div>

                <div className="grid grid-cols-1 lg:grid-cols-3 gap-8">
                    {/* 警示與通知 */}
                    <div className="lg:col-span-1 space-y-6">
                        <h2 className="text-xl font-bold text-grey-0 flex items-center gap-2">
                            <TrendingUp className="h-5 w-5 text-primary-main" />
                            即時動態
                        </h2>
                        <div className="bg-white rounded-2xl border border-grey-4 shadow-sm divide-y divide-grey-4">
                            {alertData.map((alert, index) => (
                                <div key={index} className="p-6 flex items-center justify-between group cursor-pointer hover:bg-background-light transition-colors">
                                    <div className="flex items-center gap-4">
                                        <div className={cn(
                                            "p-2 rounded-lg",
                                            alert.status === 'error' ? "bg-red-50 text-red-600" :
                                                alert.status === 'warning' ? "bg-amber-50 text-amber-600" : "bg-grey-5 text-grey-2"
                                        )}>
                                            {alert.icon}
                                        </div>
                                        <div>
                                            <p className="text-sm font-medium text-grey-1">{alert.label}</p>
                                            <p className="text-xs text-grey-3">需立即查看</p>
                                        </div>
                                    </div>
                                    <div className="flex items-center gap-2">
                                        <span className={cn(
                                            "text-lg font-bold",
                                            alert.status === 'error' ? "text-red-600" :
                                                alert.status === 'warning' ? "text-amber-600" : "text-grey-1"
                                        )}>
                                            {alert.value}
                                        </span>
                                        <ChevronRight className="h-4 w-4 text-grey-4 group-hover:translate-x-1 transition-transform" />
                                    </div>
                                </div>
                            ))}
                        </div>

                        <div className="bg-primary/5 rounded-2xl p-6 border border-primary/10">
                            <h4 className="text-sm font-bold text-primary mb-2">系統提示</h4>
                            <p className="text-xs text-grey-1 leading-relaxed">
                                目前系統運行正常。如有任何問題，請聯絡開發團隊獲取支援。
                            </p>
                        </div>
                    </div>

                    {/* 快速捷徑 */}
                    <div className="lg:col-span-2 space-y-6">
                        <h2 className="text-xl font-bold text-grey-0">快速操作</h2>
                        <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                            <Link href="/products" className="group h-full">
                                <div className="bg-white p-6 rounded-2xl border border-grey-4 shadow-sm hover:border-primary-main transition-all h-full flex flex-col justify-between">
                                    <div>
                                        <h3 className="font-bold text-grey-0 mb-1 group-hover:text-primary-main">商品管理</h3>
                                        <p className="text-sm text-grey-2">查看並編輯所有商品資料與單位換算。</p>
                                    </div>
                                    <div className="mt-4 flex items-center text-xs font-bold text-primary-main group-hover:gap-2 transition-all">
                                        即刻前往 <ChevronRight className="h-3 w-3" />
                                    </div>
                                </div>
                            </Link>
                            <Link href="/purchase-orders" className="group h-full">
                                <div className="bg-white p-6 rounded-2xl border border-grey-4 shadow-sm hover:border-purple-500 transition-all h-full flex flex-col justify-between">
                                    <div>
                                        <h3 className="font-bold text-grey-0 mb-1 group-hover:text-purple-600">採購單管理</h3>
                                        <p className="text-sm text-grey-2">處理進貨、追蹤採購進度與管理單據。</p>
                                    </div>
                                    <div className="mt-4 flex items-center text-xs font-bold text-purple-600 group-hover:gap-2 transition-all">
                                        即刻前往 <ChevronRight className="h-3 w-3" />
                                    </div>
                                </div>
                            </Link>
                            <Link href="/vendors" className="group h-full">
                                <div className="bg-white p-6 rounded-2xl border border-grey-4 shadow-sm hover:border-blue-500 transition-all h-full flex flex-col justify-between">
                                    <div>
                                        <h3 className="font-bold text-grey-0 mb-1 group-hover:text-blue-600">廠商管理</h3>
                                        <p className="text-sm text-grey-2">管理供應商聯絡資訊與供貨清單。</p>
                                    </div>
                                    <div className="mt-4 flex items-center text-xs font-bold text-blue-600 group-hover:gap-2 transition-all">
                                        即刻前往 <ChevronRight className="h-3 w-3" />
                                    </div>
                                </div>
                            </Link>
                            <Link href="/warehouses" className="group h-full">
                                <div className="bg-white p-6 rounded-2xl border border-grey-4 shadow-sm hover:border-orange-500 transition-all h-full flex flex-col justify-between">
                                    <div>
                                        <h3 className="font-bold text-grey-0 mb-1 group-hover:text-orange-600">倉庫與庫存</h3>
                                        <p className="text-sm text-grey-2">管理入庫、庫存水位與基礎設施。</p>
                                    </div>
                                    <div className="mt-4 flex items-center text-xs font-bold text-orange-600 group-hover:gap-2 transition-all">
                                        即刻前往 <ChevronRight className="h-3 w-3" />
                                    </div>
                                </div>
                            </Link>
                        </div>
                    </div>
                </div>
            </div>
        </AuthenticatedLayout>
    );
}
