import { useState } from "react";
import { Head, router } from "@inertiajs/react";
import AuthenticatedLayout from "@/Layouts/AuthenticatedLayout";
import {
    Search,
    Package,
    AlertTriangle,
    MinusCircle,
    Clock,
    Download,
    ArrowUpDown,
    ArrowUp,
    ArrowDown,
} from "lucide-react";
import {
    Table,
    TableBody,
    TableCell,
    TableHead,
    TableHeader,
    TableRow,
} from "@/Components/ui/table";
import { Badge } from "@/Components/ui/badge";
import { Button } from "@/Components/ui/button";
import { Input } from "@/Components/ui/input";
import { SearchableSelect } from "@/Components/ui/searchable-select";
import Pagination from "@/Components/shared/Pagination";

interface InventoryItem {
    id: number;
    product_code: string;
    product_name: string;
    category_name: string | null;
    warehouse_name: string;
    batch_number: string | null;
    quantity: number;
    safety_stock: number | null;
    expiry_date: string | null;
    quality_status: string | null;
    last_inbound: string | null;
    last_outbound: string | null;
    statuses: string[];
    location: string | null;
}

interface PaginationLink {
    url: string | null;
    label: string;
    active: boolean;
}

interface Props {
    filters: {
        warehouse_id?: string;
        category_id?: string;
        search?: string;
        status?: string;
        sort_by?: string;
        sort_order?: string;
        per_page?: string;
    };
    summary: {
        totalItems: number;
        lowStockCount: number;
        negativeCount: number;
        expiringCount: number;
    };
    inventories: {
        data: InventoryItem[];
        total: number;
        per_page: number;
        current_page: number;
        last_page: number;
        links: PaginationLink[];
    };
    warehouses: { id: number; name: string }[];
    categories: { id: number; name: string }[];
}

// 狀態 Badge
const statusConfig: Record<
    string,
    { label: string; className: string }
> = {
    normal: {
        label: "正常",
        className: "bg-green-100 text-green-800 border-green-200",
    },
    negative: {
        label: "負庫存",
        className: "bg-red-100 text-red-800 border-red-200",
    },
    low_stock: {
        label: "低庫存",
        className: "bg-amber-100 text-amber-800 border-amber-200",
    },
    expiring: {
        label: "即將過期",
        className: "bg-yellow-100 text-yellow-800 border-yellow-200",
    },
    expired: {
        label: "已過期",
        className: "bg-red-100 text-red-800 border-red-200",
    },
};

// 狀態篩選選項
const statusOptions = [
    { label: "全部狀態", value: "" },
    { label: "低庫存", value: "low_stock" },
    { label: "負庫存", value: "negative" },
    { label: "即將過期", value: "expiring" },
    { label: "已過期", value: "expired" },
    { label: "所有異常", value: "abnormal" },
];

export default function StockQueryIndex({
    filters,
    summary,
    inventories,
    warehouses,
    categories,
}: Props) {
    const [search, setSearch] = useState(filters.search || "");
    const [perPage, setPerPage] = useState<string>(
        filters.per_page || "10"
    );

    // 執行篩選
    const applyFilters = (newFilters: Record<string, string | undefined>) => {
        const merged = { ...filters, ...newFilters, page: undefined };
        // 移除空值
        const cleaned: Record<string, string> = {};
        Object.entries(merged).forEach(([key, value]) => {
            if (value !== undefined && value !== "" && value !== null) {
                cleaned[key] = String(value);
            }
        });
        router.get(route("inventory.stock-query.index"), cleaned, {
            preserveState: true,
            replace: true,
        });
    };

    // 搜尋
    const handleSearch = () => {
        applyFilters({ search: search || undefined });
    };

    const handleSearchKeyDown = (e: React.KeyboardEvent) => {
        if (e.key === "Enter") {
            handleSearch();
        }
    };

    // 排序
    const handleSort = (field: string) => {
        let newSortBy: string | undefined = field;
        let newSortOrder: string | undefined = "asc";

        if (filters.sort_by === field) {
            if (filters.sort_order === "asc") {
                newSortOrder = "desc";
            } else {
                newSortBy = undefined;
                newSortOrder = undefined;
            }
        }

        applyFilters({ sort_by: newSortBy, sort_order: newSortOrder });
    };

    // 排序圖標
    const SortIcon = ({ field }: { field: string }) => {
        if (filters.sort_by !== field) {
            return (
                <ArrowUpDown className="h-4 w-4 text-muted-foreground ml-1" />
            );
        }
        if (filters.sort_order === "asc") {
            return <ArrowUp className="h-4 w-4 text-primary ml-1" />;
        }
        return <ArrowDown className="h-4 w-4 text-primary ml-1" />;
    };

    // 每頁筆數變更
    const handlePerPageChange = (value: string) => {
        setPerPage(value);
        router.get(
            route("inventory.stock-query.index"),
            { ...filters, per_page: value, page: undefined },
            { preserveState: false, replace: true, preserveScroll: true }
        );
    };

    // 匯出
    const handleExport = () => {
        const params = new URLSearchParams();
        if (filters.warehouse_id)
            params.append("warehouse_id", filters.warehouse_id);
        if (filters.category_id)
            params.append("category_id", filters.category_id);
        if (filters.search) params.append("search", filters.search);
        if (filters.status) params.append("status", filters.status);
        window.location.href =
            route("inventory.stock-query.export") + "?" + params.toString();
    };

    // 計算序號起始值
    const startIndex =
        (inventories.current_page - 1) * inventories.per_page + 1;

    // 統計卡片
    const cards = [
        {
            label: "庫存品項",
            value: summary.totalItems,
            icon: <Package className="h-5 w-5" />,
            color: "text-primary-main",
            bgColor: "bg-primary-lightest",
            borderColor: "border-primary-light",
            status: "",
        },
        {
            label: "低庫存",
            value: summary.lowStockCount,
            icon: <AlertTriangle className="h-5 w-5" />,
            color: "text-amber-600",
            bgColor: "bg-amber-50",
            borderColor: "border-amber-200",
            status: "low_stock",
            alert: summary.lowStockCount > 0,
        },
        {
            label: "負庫存",
            value: summary.negativeCount,
            icon: <MinusCircle className="h-5 w-5" />,
            color: "text-red-600",
            bgColor: "bg-red-50",
            borderColor: "border-red-200",
            status: "negative",
            alert: summary.negativeCount > 0,
        },
        {
            label: "即將過期",
            value: summary.expiringCount,
            icon: <Clock className="h-5 w-5" />,
            color: "text-yellow-600",
            bgColor: "bg-yellow-50",
            borderColor: "border-yellow-200",
            status: "expiring",
            alert: summary.expiringCount > 0,
        },
    ];

    return (
        <AuthenticatedLayout
            breadcrumbs={[
                { label: "商品與庫存管理", href: "#" },
                {
                    label: "即時庫存查詢",
                    href: route("inventory.stock-query.index"),
                    isPage: true,
                },
            ]}
        >
            <Head title="即時庫存查詢" />

            <div className="container mx-auto p-6 max-w-7xl">
                {/* 頁面標題 */}
                <div className="flex items-center justify-between mb-6">
                    <div>
                        <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                            <Search className="h-6 w-6 text-primary-main" />
                            即時庫存查詢
                        </h1>
                        <p className="text-gray-500 mt-1">
                            跨倉庫即時庫存查詢，含批號追蹤與到期管理
                        </p>
                    </div>
                    <Button
                        className="button-filled-primary gap-2"
                        onClick={handleExport}
                    >
                        <Download className="h-4 w-4" />
                        匯出 Excel
                    </Button>
                </div>

                {/* 統計卡片 */}
                <div className="grid grid-cols-2 lg:grid-cols-4 gap-3 mb-6">
                    {cards.map((card) => (
                        <div
                            key={card.label}
                            onClick={() =>
                                applyFilters({
                                    status: card.status || undefined,
                                })
                            }
                            className={`relative rounded-xl border ${card.borderColor} ${card.bgColor} p-4 transition-all hover:shadow-md hover:-translate-y-0.5 cursor-pointer ${filters.status === card.status
                                ? "ring-2 ring-primary-main ring-offset-1"
                                : ""
                                }`}
                        >
                            {card.alert && (
                                <span className="absolute top-2.5 right-2.5 h-2 w-2 rounded-full bg-red-500 animate-pulse" />
                            )}
                            <div className="flex items-center gap-2 mb-2">
                                <div className={card.color}>{card.icon}</div>
                                <span className="text-xs font-medium text-grey-2">
                                    {card.label}
                                </span>
                            </div>
                            <div
                                className={`text-2xl font-bold ${card.color}`}
                            >
                                {card.value.toLocaleString()}
                            </div>
                        </div>
                    ))}
                </div>

                {/* 篩選列 */}
                <div className="bg-white rounded-xl border border-gray-200 p-4 mb-4">
                    <div className="flex flex-wrap items-center gap-3">
                        <SearchableSelect
                            value={filters.warehouse_id || ""}
                            onValueChange={(v) =>
                                applyFilters({
                                    warehouse_id: v || undefined,
                                })
                            }
                            options={[
                                { label: "全部倉庫", value: "" },
                                ...warehouses.map((w) => ({
                                    label: w.name,
                                    value: String(w.id),
                                })),
                            ]}
                            className="w-[160px] h-9"
                            placeholder="選擇倉庫"
                        />
                        <SearchableSelect
                            value={filters.category_id || ""}
                            onValueChange={(v) =>
                                applyFilters({
                                    category_id: v || undefined,
                                })
                            }
                            options={[
                                { label: "全部分類", value: "" },
                                ...categories.map((c) => ({
                                    label: c.name,
                                    value: String(c.id),
                                })),
                            ]}
                            className="w-[160px] h-9"
                            placeholder="選擇分類"
                        />
                        <SearchableSelect
                            value={filters.status || ""}
                            onValueChange={(v) =>
                                applyFilters({ status: v || undefined })
                            }
                            options={statusOptions}
                            className="w-[140px] h-9"
                            showSearch={false}
                            placeholder="篩選狀態"
                        />
                        <div className="flex items-center gap-2 flex-1 min-w-[200px]">
                            <Input
                                type="text"
                                value={search}
                                onChange={(e) => setSearch(e.target.value)}
                                onKeyDown={handleSearchKeyDown}
                                placeholder="搜尋商品代碼或名稱..."
                                className="h-9"
                            />
                            <Button
                                variant="outline"
                                size="sm"
                                className="button-outlined-primary h-9"
                                onClick={handleSearch}
                            >
                                <Search className="h-4 w-4" />
                            </Button>
                        </div>
                    </div>
                </div>

                {/* 庫存明細表格 */}
                <div className="bg-white rounded-xl border border-gray-200 shadow-sm overflow-hidden">
                    <Table>
                        <TableHeader className="bg-gray-50">
                            <TableRow>
                                <TableHead className="w-[50px] text-center">
                                    #
                                </TableHead>
                                <TableHead>
                                    <button
                                        onClick={() =>
                                            handleSort("products.code")
                                        }
                                        className="flex items-center hover:text-gray-900"
                                    >
                                        商品代碼
                                        <SortIcon field="products.code" />
                                    </button>
                                </TableHead>
                                <TableHead>
                                    <button
                                        onClick={() =>
                                            handleSort("products.name")
                                        }
                                        className="flex items-center hover:text-gray-900"
                                    >
                                        商品名稱
                                        <SortIcon field="products.name" />
                                    </button>
                                </TableHead>
                                <TableHead>分類</TableHead>
                                <TableHead>
                                    <button
                                        onClick={() =>
                                            handleSort("warehouses.name")
                                        }
                                        className="flex items-center hover:text-gray-900"
                                    >
                                        倉庫
                                        <SortIcon field="warehouses.name" />
                                    </button>
                                </TableHead>
                                <TableHead>批號</TableHead>
                                <TableHead>儲位/貨道</TableHead>
                                <TableHead>
                                    <button
                                        onClick={() =>
                                            handleSort("inventories.quantity")
                                        }
                                        className="flex items-center hover:text-gray-900"
                                    >
                                        數量
                                        <SortIcon field="inventories.quantity" />
                                    </button>
                                </TableHead>
                                <TableHead>安全庫存</TableHead>
                                <TableHead>
                                    <button
                                        onClick={() =>
                                            handleSort(
                                                "inventories.expiry_date"
                                            )
                                        }
                                        className="flex items-center hover:text-gray-900"
                                    >
                                        保存期限
                                        <SortIcon field="inventories.expiry_date" />
                                    </button>
                                </TableHead>
                                <TableHead className="text-center">
                                    狀態
                                </TableHead>
                                <TableHead>最後入庫</TableHead>
                                <TableHead>最後出庫</TableHead>
                            </TableRow>
                        </TableHeader>
                        <TableBody>
                            {inventories.data.length === 0 ? (
                                <TableRow>
                                    <TableCell
                                        colSpan={13}
                                        className="text-center py-8 text-gray-500"
                                    >
                                        無符合條件的資料
                                    </TableCell>
                                </TableRow>
                            ) : (
                                inventories.data.map((item: InventoryItem, index) => (
                                    <TableRow key={item.id}>
                                        <TableCell className="text-gray-500 font-medium text-center">
                                            {startIndex + index}
                                        </TableCell>
                                        <TableCell className="font-mono text-sm">
                                            {item.product_code}
                                        </TableCell>
                                        <TableCell className="font-medium">
                                            {item.product_name}
                                        </TableCell>
                                        <TableCell className="text-gray-500">
                                            {item.category_name || "—"}
                                        </TableCell>
                                        <TableCell>
                                            {item.warehouse_name}
                                        </TableCell>
                                        <TableCell className="text-gray-500 text-sm">
                                            {item.batch_number || "—"}
                                        </TableCell>
                                        <TableCell className="text-sm text-gray-500">
                                            {item.location || "—"}
                                        </TableCell>
                                        <TableCell className={`text-right font-medium ${item.quantity < 0 ? "text-red-600" : ""}`}>
                                            {item.quantity}
                                        </TableCell>
                                        <TableCell className="text-right text-gray-500">
                                            {item.safety_stock !== null
                                                ? item.safety_stock
                                                : "—"}
                                        </TableCell>
                                        <TableCell className="text-sm">
                                            {item.expiry_date || "—"}
                                        </TableCell>
                                        <TableCell className="text-center">
                                            <div className="flex flex-wrap items-center justify-center gap-1">
                                                {item.statuses.map(
                                                    (status) => {
                                                        const config =
                                                            statusConfig[
                                                            status
                                                            ];
                                                        if (!config)
                                                            return null;
                                                        return (
                                                            <Badge
                                                                key={status}
                                                                variant="outline"
                                                                className={
                                                                    config.className
                                                                }
                                                            >
                                                                {config.label}
                                                            </Badge>
                                                        );
                                                    }
                                                )}
                                            </div>
                                        </TableCell>
                                        <TableCell className="text-sm text-gray-500">
                                            {item.last_inbound || "—"}
                                        </TableCell>
                                        <TableCell className="text-sm text-gray-500">
                                            {item.last_outbound || "—"}
                                        </TableCell>
                                    </TableRow>
                                ))
                            )}
                        </TableBody>
                    </Table>
                </div>

                {/* 分頁 */}
                <div className="mt-4 flex flex-col sm:flex-row items-center justify-between gap-4">
                    <div className="flex items-center gap-4">
                        <div className="flex items-center gap-2 text-sm text-gray-500">
                            <span>每頁顯示</span>
                            <SearchableSelect
                                value={perPage}
                                onValueChange={handlePerPageChange}
                                options={[
                                    { label: "10", value: "10" },
                                    { label: "20", value: "20" },
                                    { label: "50", value: "50" },
                                    { label: "100", value: "100" },
                                ]}
                                className="w-[90px] h-8"
                                showSearch={false}
                            />
                            <span>筆</span>
                        </div>
                        <span className="text-sm text-gray-500">
                            共 {inventories.total} 筆紀錄
                        </span>
                    </div>
                    <Pagination links={inventories.links} />
                </div>
            </div>
        </AuthenticatedLayout>
    );
}
