import { useState } from "react";
import { Button } from "@/Components/ui/button";
import { Input } from "@/Components/ui/input";
import { Label } from "@/Components/ui/label";
import {
    BarChart3,
    Download,
    Calendar,
    Filter,
    TrendingDown,
    Package,
    Pocket,
    RotateCcw,
    FileText
} from 'lucide-react';
import AuthenticatedLayout from "@/Layouts/AuthenticatedLayout";
import { Head, router } from "@inertiajs/react";
import {
    Table,
    TableBody,
    TableCell,
    TableHead,
    TableHeader,
    TableRow,
} from "@/Components/ui/table";
import { getDateRange, formatDateWithDayOfWeek } from "@/utils/format";
import { Badge } from "@/Components/ui/badge";
import Pagination from "@/Components/shared/Pagination";
import { SearchableSelect } from "@/Components/ui/searchable-select";
import { Can } from "@/Components/Permission/Can";
import { Checkbox } from "@/Components/ui/checkbox";

interface Record {
    id: string;
    date: string;
    source: string;
    category: string;
    item: string;
    reference: string;
    invoice_number?: string;
    amount: number | string;
}

interface PageProps {
    records: {
        data: Record[];
        links: any[];
        total: number;
        from: number;
        to: number;
        current_page: number;
    };
    summary: {
        total_amount: number;
        purchase_total: number;
        utility_total: number;
        record_count: number;
    };
    filters: {
        date_start: string;
        date_end: string;
        per_page?: number;
    };
}

export default function AccountingReport({ records, summary, filters }: PageProps) {
    const [dateStart, setDateStart] = useState(filters.date_start);
    const [dateEnd, setDateEnd] = useState(filters.date_end);

    // Determine initial range type
    const today = new Date().toISOString().split('T')[0];
    const initialRangeType = (filters.date_start === today && filters.date_end === today) ? "today" : "custom";
    const [dateRangeType, setDateRangeType] = useState(initialRangeType);
    const [perPage, setPerPage] = useState(filters.per_page?.toString() || "10");
    const [selectedIds, setSelectedIds] = useState<string[]>([]);

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

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


    const handleFilter = () => {
        router.get(
            route("accounting.report"),
            {
                date_start: dateStart,
                date_end: dateEnd,
                per_page: perPage,
            },
            { preserveState: true }
        );
    };

    const handlePerPageChange = (value: string) => {
        setPerPage(value);
        router.get(
            route("accounting.report"),
            {
                date_start: dateStart,
                date_end: dateEnd,
                per_page: value,
            },
            { preserveState: true }
        );
    };

    const handleClearFilters = () => {
        setDateStart("");
        setDateEnd("");
        setPerPage("10");
        setSelectedIds([]);
        router.get(route("accounting.report"), {}, { preserveState: false });
    };

    const toggleSelectAll = () => {
        if (selectedIds.length === records.data.length) {
            setSelectedIds([]);
        } else {
            setSelectedIds(records.data.map(r => r.id));
        }
    };

    const toggleSelect = (id: string) => {
        setSelectedIds(prev =>
            prev.includes(id) ? prev.filter(i => i !== id) : [...prev, id]
        );
    };

    const handleExport = () => {
        const query: any = {
            date_start: dateStart,
            date_end: dateEnd,
        };

        if (selectedIds.length > 0) {
            query.selected_ids = selectedIds.join(',');
        }

        window.location.href = route("accounting.export", query);
    };

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

            <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">
                            <BarChart3 className="h-6 w-6 text-primary-main" />
                            會計報表
                        </h1>
                        <p className="text-gray-500 mt-1">彙整採購支出與各項公用事業費用</p>
                    </div>

                    <Can permission="accounting.export">
                        <Button
                            onClick={handleExport}
                            variant="outline"
                            className="button-outlined-primary gap-2"
                        >
                            <Download className="h-4 w-4" />
                            {selectedIds.length > 0 ? `匯出已選 (${selectedIds.length})` : '匯出 CSV 報表'}
                        </Button>
                    </Can>
                </div>

                {/* Filters with Quick Date Range */}
                <div className="bg-white rounded-xl shadow-sm border border-grey-4 p-5 mb-6">
                    <div className="flex flex-col gap-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>

                        {/* Row 2: Actions */}
                        <div className="grid grid-cols-1 md:grid-cols-12 gap-4 items-end">
                            <div className="md:col-span-9"></div>
                            <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>

                {/* Compact Summary - Full Width Grid (Horizontal Style) */}
                <div className="grid grid-cols-1 md:grid-cols-3 gap-4 mb-6">
                    <div className="flex items-center gap-3 px-4 py-4 bg-white rounded-xl border-l-4 border-l-red-500 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                        <TrendingDown className="h-6 w-6 text-red-500 shrink-0" />
                        <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                            <span className="text-sm text-gray-500 font-medium shrink-0">總計支出</span>
                            <span className="text-xl font-bold text-gray-900 truncate">$ {Number(summary.total_amount).toLocaleString()}</span>
                        </div>
                    </div>

                    <div className="flex items-center gap-3 px-4 py-4 bg-white rounded-xl border-l-4 border-l-orange-500 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                        <Package className="h-6 w-6 text-orange-500 shrink-0" />
                        <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                            <span className="text-sm text-gray-500 font-medium shrink-0">採購支出</span>
                            <span className="text-xl font-bold text-gray-900 truncate">$ {Number(summary.purchase_total).toLocaleString()}</span>
                        </div>
                    </div>

                    <div className="flex items-center gap-3 px-4 py-4 bg-white rounded-xl border-l-4 border-l-blue-500 shadow-sm border border-gray-100 transition-all hover:bg-gray-50">
                        <Pocket className="h-6 w-6 text-blue-500 shrink-0" />
                        <div className="flex flex-1 items-baseline justify-between gap-2 min-w-0">
                            <span className="text-sm text-gray-500 font-medium shrink-0">公共事業費</span>
                            <span className="text-xl font-bold text-gray-900 truncate">$ {Number(summary.utility_total).toLocaleString()}</span>
                        </div>
                    </div>
                </div>

                {/* 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-[50px] text-center">
                                    <Checkbox
                                        checked={records.data.length > 0 && selectedIds.length === records.data.length}
                                        onCheckedChange={toggleSelectAll}
                                        aria-label="Select all"
                                    />
                                </TableHead>
                                <TableHead className="w-[140px] text-center">日期</TableHead>
                                <TableHead className="w-[120px] text-center">來源</TableHead>
                                <TableHead className="w-[140px] text-center">類別</TableHead>
                                <TableHead className="px-6">項目詳細</TableHead>
                                <TableHead className="w-[180px] text-right px-6">金額</TableHead>
                            </TableRow>
                        </TableHeader>
                        <TableBody>
                            {records.data.length === 0 ? (
                                <TableRow>
                                    <TableCell colSpan={6}>
                                        <div className="flex flex-col items-center justify-center space-y-2 py-8 text-gray-400">
                                            <FileText className="h-10 w-10 opacity-20" />
                                            <p>此日期區間內無支出紀錄</p>
                                        </div>
                                    </TableCell>
                                </TableRow>
                            ) : (
                                records.data.map((record) => (
                                    <TableRow key={record.id}>
                                        <TableCell className="text-center">
                                            <Checkbox
                                                checked={selectedIds.includes(record.id)}
                                                onCheckedChange={() => toggleSelect(record.id)}
                                                aria-label={`Select record ${record.id}`}
                                            />
                                        </TableCell>
                                        <TableCell className="font-medium text-gray-700 text-center">
                                            {formatDateWithDayOfWeek(record.date)}
                                        </TableCell>
                                        <TableCell className="text-center">
                                            <Badge variant="secondary" className={
                                                record.source === '採購單'
                                                    ? 'bg-orange-50 text-orange-700 border-orange-100'
                                                    : 'bg-blue-50 text-blue-700 border-blue-100'
                                            }>
                                                {record.source}
                                            </Badge>
                                        </TableCell>
                                        <TableCell className="text-gray-600 text-center">
                                            <Badge variant="outline" className="font-normal border-gray-200">
                                                {record.category}
                                            </Badge>
                                        </TableCell>
                                        <TableCell>
                                            <div className="flex flex-col">
                                                <span className="font-medium text-gray-900">{record.item}</span>
                                                {record.invoice_number && (
                                                    <span className="text-xs text-gray-400">發票：{record.invoice_number}</span>
                                                )}
                                            </div>
                                        </TableCell>
                                        <TableCell className="text-right font-bold text-gray-900 px-4">
                                            $ {Number(record.amount).toLocaleString()}
                                        </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={records.links} />
                    </div>
                </div>
            </div>
        </AuthenticatedLayout>
    );
}
