import { useState, useCallback } from "react";
import { Button } from "@/Components/ui/button";
import { Input } from "@/Components/ui/input";
import { Label } from "@/Components/ui/label";
import {
    Download,
    Calendar,
    Filter,
    Package,
    RotateCcw,
    FileSpreadsheet,
    ArrowUpFromLine,
    ArrowDownToLine,
    ArrowRightLeft,
    TrendingUp,
    ArrowUpDown,
    ArrowUp,
    ArrowDown
} from 'lucide-react';
import AuthenticatedLayout from "@/Layouts/AuthenticatedLayout";
import { Head, Link, router } from "@inertiajs/react";
import {
    Table,
    TableBody,
    TableCell,
    TableHead,
    TableHeader,
    TableRow,
} from "@/Components/ui/table";
import { getDateRange } from "@/utils/format";
import Pagination from "@/Components/shared/Pagination";
import { SearchableSelect } from "@/Components/ui/searchable-select";
import { Can } from "@/Components/Permission/Can";
import { PageProps } from "@/types/global";
import {
    Tooltip,
    TooltipContent,
    TooltipProvider,
    TooltipTrigger,
} from "@/Components/ui/tooltip";

interface ReportData {
    product_code: string;
    product_name: string;
    category_name: string;
    product_id: number;
    inbound_qty: number;
    outbound_qty: number;
    transfer_in_qty: number;
    transfer_out_qty: number;
    adjust_qty: number;
    net_change: number;
}

interface SummaryData {
    total_inbound: number;
    total_outbound: number;
    total_transfer_in: number;
    total_transfer_out: number;
    total_adjust: number;
    total_net_change: number;
}

interface InventoryReportProps extends PageProps {
    reportData: {
        data: ReportData[];
        links: any[];
        total: number;
        from: number;
        to: number;
        current_page: number;
    };
    summary: SummaryData;
    warehouses: { id: number; name: string }[];
    categories: { id: number; name: string }[];
    filters: {
        date_from: string;
        date_to: string;
        warehouse_id: string;
        category_id: string;
        search: string;
        per_page?: number;
        sort_by?: string;
        sort_order?: 'asc' | 'desc';
    };
}

export default function InventoryReportIndex({ reportData, summary, warehouses, categories, filters }: InventoryReportProps) {
    const [dateStart, setDateStart] = useState(filters.date_from || "");
    const [dateEnd, setDateEnd] = useState(filters.date_to || "");
    const [warehouseId, setWarehouseId] = useState(filters.warehouse_id || "all");
    const [categoryId, setCategoryId] = useState(filters.category_id || "all");
    const [search, setSearch] = useState(filters.search || "");
    const [perPage, setPerPage] = useState(filters.per_page?.toString() || "10");

    // Determine initial range type based on date pairs
    const getInitialRangeType = () => {
        const { start: todayS, end: todayE } = getDateRange('today');
        const { start: yestS, end: yestE } = getDateRange('yesterday');
        const { start: weekS, end: weekE } = getDateRange('this_week');
        const { start: monthS, end: monthE } = getDateRange('this_month');
        const { start: lastMS, end: lastME } = getDateRange('last_month');

        const fS = filters.date_from || "";
        const fE = filters.date_to || "";

        if (fS === todayS && fE === todayE) return "today";
        if (fS === yestS && fE === yestE) return "yesterday";
        if (fS === weekS && fE === weekE) return "this_week";
        if (fS === monthS && fE === monthE) return "this_month";
        if (fS === lastMS && fE === lastME) return "last_month";

        return "custom";
    };

    const [dateRangeType, setDateRangeType] = useState(getInitialRangeType());

    const handleDateRangeChange = (type: string) => {
        setDateRangeType(type);
        if (type === "custom") return;

        const { start, end } = getDateRange(type);
        setDateStart(start);
        setDateEnd(end);
    };

    const handleFilter = useCallback(() => {
        router.get(
            route("inventory.report.index"),
            {
                date_from: dateStart,
                date_to: dateEnd,
                warehouse_id: warehouseId === "all" ? "" : warehouseId,
                category_id: categoryId === "all" ? "" : categoryId,
                search: search,
                per_page: perPage,
            },
            { preserveState: true, preserveScroll: true }
        );
    }, [dateStart, dateEnd, warehouseId, categoryId, search, perPage]);

    const handlePerPageChange = (value: string) => {
        setPerPage(value);
        router.get(
            route("inventory.report.index"),
            {
                date_from: dateStart,
                date_to: dateEnd,
                warehouse_id: warehouseId === "all" ? "" : warehouseId,
                category_id: categoryId === "all" ? "" : categoryId,
                search: search,
                per_page: value,
            },
            { preserveState: true, preserveScroll: true }
        );
    };

    const handleClearFilters = () => {
        // Service defaults: -7 days to today.
        // Let's just clear params and let backend decide or set explicitly.
        // Or simply reset to "daily" and "all"
        setWarehouseId("all");
        setCategoryId("all");
        setSearch("");
        setDateStart(""); // Will trigger service default
        setDateEnd("");
        setDateRangeType("custom");
        setPerPage("10");
        router.get(route("inventory.report.index"));
    };

    const handleExport = () => {
        const query: any = {
            date_from: dateStart,
            date_to: dateEnd,
            warehouse_id: warehouseId === "all" ? "" : warehouseId,
            category_id: categoryId === "all" ? "" : categoryId,
            search: search,
            sort_by: filters.sort_by,
            sort_order: filters.sort_order,
        };
        window.location.href = route("inventory.report.export", query);
    };

    const handleSort = (field: string) => {
        let newSortBy: string | undefined = field;
        let newSortOrder: 'asc' | 'desc' | undefined = 'asc';

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

        router.get(
            route("inventory.report.index"),
            {
                date_from: dateStart,
                date_to: dateEnd,
                warehouse_id: warehouseId === "all" ? "" : warehouseId,
                category_id: categoryId === "all" ? "" : categoryId,
                search: search,
                per_page: perPage,
                sort_by: newSortBy,
                sort_order: newSortOrder,
            },
            { preserveState: true, preserveScroll: true }
        );
    };

    const SortIcon = ({ field }: { field: string }) => {
        if (filters.sort_by !== field) {
            return <ArrowUpDown className="h-4 w-4 text-gray-300 ml-1" />;
        }
        if (filters.sort_order === "asc") {
            return <ArrowUp className="h-4 w-4 text-primary-main ml-1" />;
        }
        return <ArrowDown className="h-4 w-4 text-primary-main ml-1" />;
    };

    return (
        <AuthenticatedLayout breadcrumbs={[{ label: "報表管理", href: "#" }, { label: "庫存報表", href: route("inventory.report.index"), isPage: true }]}>
            <Head title="庫存報表" />

            <div className="container mx-auto p-6 max-w-7xl">
                {/* Header */}
                <div className="flex flex-col md:flex-row md:items-center justify-between gap-4 mb-6">
                    <div>
                        <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                            <FileSpreadsheet className="h-6 w-6 text-primary-main" />
                            庫存報表
                        </h1>
                        <p className="text-gray-500 mt-1">
                            統計區間：
                            {filters.date_from && filters.date_to ? (
                                <><span className="font-medium text-gray-700">{filters.date_from}</span> 至 <span className="font-medium text-gray-700">{filters.date_to}</span></>
                            ) : (
                                <span className="font-medium text-gray-700">全部期間</span>
                            )}
                            內的進貨、出貨與庫存變動匯總
                        </p>
                    </div>

                    <Can permission="inventory_report.export">
                        <Button
                            onClick={handleExport}
                            variant="outline"
                            className="button-outlined-primary gap-2"
                        >
                            <Download className="h-4 w-4" />
                            匯出 Excel 報表
                        </Button>
                    </Can>
                </div>

                {/* Filters */}
                <div className="bg-white rounded-xl shadow-sm border border-grey-4 p-5 mb-6">
                    <div className="space-y-4">
                        {/* Top Config: Date Range & Quick Buttons */}
                        <div className="flex flex-col lg:flex-row gap-4 lg:items-end">
                            <div className="flex-none space-y-2">
                                <Label className="text-xs font-medium text-grey-2">快速時間區間</Label>
                                <div className="flex flex-wrap gap-2">
                                    {[
                                        { label: "今日", value: "today" },
                                        { label: "昨日", value: "yesterday" },
                                        { label: "本週", value: "this_week" },
                                        { label: "本月", value: "this_month" },
                                        { label: "上月", value: "last_month" },
                                    ].map((opt) => (
                                        <Button
                                            key={opt.value}
                                            size="sm"
                                            onClick={() => handleDateRangeChange(opt.value)}
                                            className={
                                                dateRangeType === opt.value
                                                    ? 'button-filled-primary h-9 px-4 shadow-sm'
                                                    : 'button-outlined-primary h-9 px-4 bg-white'
                                            }
                                        >
                                            {opt.label}
                                        </Button>
                                    ))}
                                </div>
                            </div>

                            {/* Date Inputs */}
                            <div className="w-full lg:flex-1">
                                <div className="grid grid-cols-2 gap-2">
                                    <div className="space-y-1">
                                        <Label className="text-xs text-grey-2 font-medium">開始日期</Label>
                                        <div className="relative">
                                            <Calendar className="absolute left-2.5 top-1/2 transform -translate-y-1/2 h-4 w-4 text-gray-400 pointer-events-none" />
                                            <Input
                                                type="date"
                                                value={dateStart}
                                                onChange={(e) => {
                                                    setDateStart(e.target.value);
                                                    setDateRangeType('custom');
                                                }}
                                                className="pl-9 block w-full h-9 bg-white"
                                            />
                                        </div>
                                    </div>
                                    <div className="space-y-1">
                                        <Label className="text-xs text-grey-2 font-medium">結束日期</Label>
                                        <div className="relative">
                                            <Calendar className="absolute left-2.5 top-1/2 transform -translate-y-1/2 h-4 w-4 text-gray-400 pointer-events-none" />
                                            <Input
                                                type="date"
                                                value={dateEnd}
                                                onChange={(e) => {
                                                    setDateEnd(e.target.value);
                                                    setDateRangeType('custom');
                                                }}
                                                className="pl-9 block w-full h-9 bg-white"
                                            />
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </div>

                        {/* Detailed Filters row */}
                        <div className="grid grid-cols-1 md:grid-cols-12 gap-4 items-end">
                            {/* Warehouse & Category */}
                            <div className="md:col-span-3 space-y-1">
                                <Label className="text-xs text-grey-2 font-medium">倉庫</Label>
                                <SearchableSelect
                                    value={warehouseId}
                                    onValueChange={setWarehouseId}
                                    options={[{ label: "全部倉庫", value: "all" }, ...warehouses.map(w => ({ label: w.name, value: w.id.toString() }))]}
                                    className="w-full h-9"
                                    placeholder="選擇倉庫..."
                                />
                            </div>
                            <div className="md:col-span-3 space-y-1">
                                <Label className="text-xs text-grey-2 font-medium">分類</Label>
                                <SearchableSelect
                                    value={categoryId}
                                    onValueChange={setCategoryId}
                                    options={[{ label: "全部分類", value: "all" }, ...categories.map(c => ({ label: c.name, value: c.id.toString() }))]}
                                    className="w-full h-9"
                                    placeholder="選擇分類..."
                                />
                            </div>

                            {/* Search */}
                            <div className="md:col-span-3 space-y-1">
                                <Label className="text-xs text-grey-2 font-medium">關鍵字</Label>
                                <Input
                                    placeholder="搜尋商品..."
                                    value={search}
                                    onChange={(e) => setSearch(e.target.value)}
                                    className="h-9 bg-white"
                                    onKeyDown={(e) => e.key === 'Enter' && handleFilter()}
                                />
                            </div>

                            {/* Action Buttons Integrated */}
                            <div className="md:col-span-3 flex items-center gap-2">
                                <Button
                                    variant="outline"
                                    onClick={handleClearFilters}
                                    className="flex-1 items-center gap-2 button-outlined-primary h-9"
                                >
                                    <RotateCcw className="h-4 w-4" />
                                    重置
                                </Button>
                                <Button
                                    onClick={handleFilter}
                                    className="flex-1 button-filled-primary h-9 gap-2"
                                >
                                    <Filter className="h-4 w-4" /> 查詢
                                </Button>
                            </div>
                        </div>
                    </div>
                </div>

                {/* Summary Cards */}
                <TooltipProvider>
                    <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-6 gap-3 mb-6">
                        <div className="flex items-center gap-3 px-4 py-3 bg-white rounded-xl border-l-4 border-l-emerald-500 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                            <ArrowDownToLine className="h-4 w-4 text-emerald-500 shrink-0" />
                            <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                                <span className="text-xs text-gray-500 font-medium shrink-0">進貨量</span>
                                <Tooltip>
                                    <TooltipTrigger asChild>
                                        <span className="text-lg font-bold text-gray-900 truncate cursor-help">{Number(summary?.total_inbound || 0).toLocaleString()}</span>
                                    </TooltipTrigger>
                                    <TooltipContent>
                                        <p>{Number(summary?.total_inbound || 0).toLocaleString()}</p>
                                    </TooltipContent>
                                </Tooltip>
                            </div>
                        </div>

                        <div className="flex items-center gap-3 px-4 py-3 bg-white rounded-xl border-l-4 border-l-red-500 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                            <ArrowUpFromLine className="h-4 w-4 text-red-500 shrink-0" />
                            <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                                <span className="text-xs text-gray-500 font-medium shrink-0">出貨量</span>
                                <Tooltip>
                                    <TooltipTrigger asChild>
                                        <span className="text-lg font-bold text-gray-900 truncate cursor-help">{Number(summary?.total_outbound || 0).toLocaleString()}</span>
                                    </TooltipTrigger>
                                    <TooltipContent>
                                        <p>{Number(summary?.total_outbound || 0).toLocaleString()}</p>
                                    </TooltipContent>
                                </Tooltip>
                            </div>
                        </div>

                        <div className="flex items-center gap-3 px-4 py-3 bg-white rounded-xl border-l-4 border-l-cyan-500 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                            <ArrowDownToLine className="h-4 w-4 text-cyan-500 shrink-0 rotate-180" />
                            <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                                <span className="text-xs text-gray-500 font-medium shrink-0">調撥入</span>
                                <Tooltip>
                                    <TooltipTrigger asChild>
                                        <span className="text-lg font-bold text-gray-900 truncate cursor-help">{Number(summary?.total_transfer_in || 0).toLocaleString()}</span>
                                    </TooltipTrigger>
                                    <TooltipContent>
                                        <p>{Number(summary?.total_transfer_in || 0).toLocaleString()}</p>
                                    </TooltipContent>
                                </Tooltip>
                            </div>
                        </div>

                        <div className="flex items-center gap-3 px-4 py-3 bg-white rounded-xl border-l-4 border-l-orange-500 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                            <ArrowUpFromLine className="h-4 w-4 text-orange-500 shrink-0 rotate-180" />
                            <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                                <span className="text-xs text-gray-500 font-medium shrink-0">調撥出</span>
                                <Tooltip>
                                    <TooltipTrigger asChild>
                                        <span className="text-lg font-bold text-gray-900 truncate cursor-help">{Number(summary?.total_transfer_out || 0).toLocaleString()}</span>
                                    </TooltipTrigger>
                                    <TooltipContent>
                                        <p>{Number(summary?.total_transfer_out || 0).toLocaleString()}</p>
                                    </TooltipContent>
                                </Tooltip>
                            </div>
                        </div>

                        <div className="flex items-center gap-3 px-4 py-3 bg-white rounded-xl border-l-4 border-l-blue-500 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                            <ArrowRightLeft className="h-4 w-4 text-blue-500 shrink-0" />
                            <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                                <span className="text-xs text-gray-500 font-medium shrink-0">調整量</span>
                                <Tooltip>
                                    <TooltipTrigger asChild>
                                        <span className="text-lg font-bold text-gray-900 truncate cursor-help">{Number(summary?.total_adjust || 0).toLocaleString()}</span>
                                    </TooltipTrigger>
                                    <TooltipContent>
                                        <p>{Number(summary?.total_adjust || 0).toLocaleString()}</p>
                                    </TooltipContent>
                                </Tooltip>
                            </div>
                        </div>

                        <div className="flex items-center gap-3 px-4 py-3 bg-white rounded-xl border-l-4 border-l-gray-700 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                            <TrendingUp className="h-4 w-4 text-gray-700 shrink-0" />
                            <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                                <span className="text-xs text-gray-500 font-medium shrink-0">淨變動</span>
                                <Tooltip>
                                    <TooltipTrigger asChild>
                                        <span className={`text-lg font-bold truncate cursor-help ${summary?.total_net_change >= 0 ? "text-emerald-600" : "text-red-600"}`}>
                                            {summary?.total_net_change > 0 ? "+" : ""}{Number(summary?.total_net_change || 0).toLocaleString()}
                                        </span>
                                    </TooltipTrigger>
                                    <TooltipContent>
                                        <p>{summary?.total_net_change > 0 ? "+" : ""}{Number(summary?.total_net_change || 0).toLocaleString()}</p>
                                    </TooltipContent>
                                </Tooltip>
                            </div>
                        </div>
                    </div>
                </TooltipProvider>

                {/* Results Table */}
                <div className="bg-white rounded-xl border border-gray-200 shadow-sm overflow-hidden">
                    <Table>
                        <TableHeader className="bg-gray-50">
                            <TableRow>
                                <TableHead className="w-[100px]">商品代碼</TableHead>
                                <TableHead>商品名稱</TableHead>
                                <TableHead className="w-[120px]">分類</TableHead>
                                <TableHead className="text-right w-[100px] text-emerald-600 cursor-pointer hover:bg-gray-100 transition-colors" onClick={() => handleSort('inbound_qty')}>
                                    <div className="flex items-center justify-end">進貨量 <SortIcon field="inbound_qty" /></div>
                                </TableHead>
                                <TableHead className="text-right w-[100px] text-red-600 cursor-pointer hover:bg-gray-100 transition-colors" onClick={() => handleSort('outbound_qty')}>
                                    <div className="flex items-center justify-end">出貨量 <SortIcon field="outbound_qty" /></div>
                                </TableHead>
                                <TableHead className="text-right w-[100px] text-cyan-600 cursor-pointer hover:bg-gray-100 transition-colors" onClick={() => handleSort('transfer_in_qty')}>
                                    <div className="flex items-center justify-end">調撥入 <SortIcon field="transfer_in_qty" /></div>
                                </TableHead>
                                <TableHead className="text-right w-[100px] text-orange-600 cursor-pointer hover:bg-gray-100 transition-colors" onClick={() => handleSort('transfer_out_qty')}>
                                    <div className="flex items-center justify-end">調撥出 <SortIcon field="transfer_out_qty" /></div>
                                </TableHead>
                                <TableHead className="text-right w-[100px] text-blue-600 cursor-pointer hover:bg-gray-100 transition-colors" onClick={() => handleSort('adjust_qty')}>
                                    <div className="flex items-center justify-end">調整量 <SortIcon field="adjust_qty" /></div>
                                </TableHead>
                                <TableHead className="text-right w-[100px] cursor-pointer hover:bg-gray-100 transition-colors" onClick={() => handleSort('net_change')}>
                                    <div className="flex items-center justify-end">淨變動 <SortIcon field="net_change" /></div>
                                </TableHead>
                            </TableRow>
                        </TableHeader>
                        <TableBody>
                            {reportData.data.length === 0 ? (
                                <TableRow>
                                    <TableCell colSpan={9}>
                                        <div className="flex flex-col items-center justify-center space-y-2 py-8 text-gray-400">
                                            <Package className="h-10 w-10 opacity-20" />
                                            <p>無符合條件的報表資料</p>
                                        </div>
                                    </TableCell>
                                </TableRow>
                            ) : (
                                reportData.data.map((row) => (
                                    <TableRow key={row.product_id} className="hover:bg-gray-50/50 transition-colors">
                                        <TableCell className="font-medium">
                                            <Link
                                                href={route('inventory.report.show', {
                                                    product: row.product_id,
                                                    date_from: filters.date_from,
                                                    date_to: filters.date_to,
                                                    warehouse_id: filters.warehouse_id,
                                                    // 以下為返回時恢復報表狀態用
                                                    category_id: filters.category_id,
                                                    search: filters.search,
                                                    per_page: filters.per_page,
                                                    report_page: reportData.current_page,
                                                })}
                                                className="text-primary hover:underline hover:text-primary/80 transition-colors"
                                            >
                                                {row.product_code}
                                            </Link>
                                        </TableCell>
                                        <TableCell>
                                            <Link
                                                href={route('inventory.report.show', {
                                                    product: row.product_id,
                                                    date_from: filters.date_from,
                                                    date_to: filters.date_to,
                                                    warehouse_id: filters.warehouse_id,
                                                    category_id: filters.category_id,
                                                    search: filters.search,
                                                    per_page: filters.per_page,
                                                    report_page: reportData.current_page,
                                                })}
                                                className="text-gray-900 hover:text-primary transition-colors font-medium"
                                            >
                                                {row.product_name}
                                            </Link>
                                        </TableCell>
                                        <TableCell className="text-gray-500">{row.category_name || '-'}</TableCell>
                                        <TableCell className="text-right text-emerald-600 font-medium">
                                            {row.inbound_qty > 0 ? `+${row.inbound_qty}` : "-"}
                                        </TableCell>
                                        <TableCell className="text-right text-red-600 font-medium">
                                            {row.outbound_qty > 0 ? `-${row.outbound_qty}` : "-"}
                                        </TableCell>
                                        <TableCell className="text-right text-cyan-600 font-medium">
                                            {row.transfer_in_qty > 0 ? `+${row.transfer_in_qty}` : "-"}
                                        </TableCell>
                                        <TableCell className="text-right text-orange-600 font-medium">
                                            {row.transfer_out_qty > 0 ? `-${row.transfer_out_qty}` : "-"}
                                        </TableCell>
                                        <TableCell className="text-right text-blue-600 font-medium">
                                            {row.adjust_qty !== 0 ? (row.adjust_qty > 0 ? `+${row.adjust_qty}` : row.adjust_qty) : "-"}
                                        </TableCell>
                                        <TableCell className={`text-right font-bold ${Number(row.net_change) >= 0 ? 'text-gray-900' : 'text-red-500'}`}>
                                            {Number(row.net_change) > 0 ? `+${row.net_change}` : row.net_change}
                                        </TableCell>
                                    </TableRow>
                                ))
                            )}
                        </TableBody>
                    </Table>
                </div>

                {/* Pagination Footer */}
                <div className="mt-6 flex flex-col sm:flex-row items-start sm:items-center justify-between 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-[100px] h-8"
                            showSearch={false}
                        />
                        <span>筆</span>
                    </div>
                    <div className="w-full sm:w-auto flex justify-center sm:justify-end">
                        <Pagination links={reportData.links} />
                    </div>
                </div>
            </div>
        </AuthenticatedLayout>
    );
}