import { useState } from 'react';
import AuthenticatedLayout from '@/Layouts/AuthenticatedLayout';
import { Head, router } from '@inertiajs/react';
import { PageProps } from '@/types/global';
import {
    Table,
    TableBody,
    TableCell,
    TableHead,
    TableHeader,
    TableRow,
} from "@/Components/ui/table";
import { Badge } from "@/Components/ui/badge";
import Pagination from '@/Components/shared/Pagination';
import { SearchableSelect } from "@/Components/ui/searchable-select";
import { FileText, Eye, ArrowUpDown, ArrowUp, ArrowDown } from 'lucide-react';
import { Button } from '@/Components/ui/button';
import ActivityDetailDialog from './ActivityDetailDialog';

interface Activity {
    id: number;
    description: string;
    subject_type: string;
    event: string;
    causer: string;
    created_at: string;
    properties: any;
}

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

interface Props extends PageProps {
    activities: {
        data: Activity[];
        links: PaginationLinks[];
        current_page: number;
        last_page: number;
        total: number;
        from: number;
    };
    filters: {
        per_page?: string;
        sort_by?: string;
        sort_order?: 'asc' | 'desc';
    };
}

export default function ActivityLogIndex({ activities, filters }: Props) {
    const [perPage, setPerPage] = useState<string>(filters.per_page || "10");
    const [selectedActivity, setSelectedActivity] = useState<Activity | null>(null);
    const [detailOpen, setDetailOpen] = useState(false);

    const getEventBadgeClass = (event: string) => {
        switch (event) {
            case 'created': return 'bg-green-50 text-green-700 border-green-200 hover:bg-green-100';
            case 'updated': return 'bg-blue-50 text-blue-700 border-blue-200 hover:bg-blue-100';
            case 'deleted': return 'bg-red-50 text-red-700 border-red-200 hover:bg-red-100';
            default: return 'bg-gray-50 text-gray-700 border-gray-200 hover:bg-gray-100';
        }
    };

    const getEventLabel = (event: string) => {
        switch (event) {
            case 'created': return '新增';
            case 'updated': return '更新';
            case 'deleted': return '刪除';
            default: return event;
        }
    };

    const getDescription = (activity: Activity) => {
        const props = activity.properties || {};
        const attrs = props.attributes || {};
        const old = props.old || {};

        // Try to find a name in attributes or old values
        // Priority: specific name fields > generic name > code > ID
        const nameParams = ['product_name', 'warehouse_name', 'category_name', 'base_unit_name', 'name', 'code', 'title'];
        let subjectName = '';

        // Special handling for Inventory: show "Warehouse - Product"
        if (attrs.warehouse_name && attrs.product_name) {
            subjectName = `${attrs.warehouse_name} - ${attrs.product_name}`;
        } else if (old.warehouse_name && old.product_name) {
            subjectName = `${old.warehouse_name} - ${old.product_name}`;
        } else {
            // Default fallback
            for (const param of nameParams) {
                if (attrs[param]) {
                    subjectName = attrs[param];
                    break;
                }
                if (old[param]) {
                    subjectName = old[param];
                    break;
                }
            }
        }

        // If no name found, try ID but format it nicely if possible, or just don't show it if it's redundant with subject_type
        if (!subjectName && (attrs.id || old.id)) {
            subjectName = `#${attrs.id || old.id}`;
        }

        // Combine parts: [Causer] [Action] [Name] [Subject]
        // Example: Admin 新增 可樂 商品
        // Example: Admin 更新 台北倉 - 可樂 庫存
        return (
            <span className="flex items-center gap-1.5 flex-wrap">
                <span className="font-medium text-gray-900">{activity.causer}</span>
                <span className="text-gray-500">{getEventLabel(activity.event)}</span>
                {subjectName && (
                    <span className="font-medium text-primary-600 bg-primary-50 px-1.5 py-0.5 rounded text-xs">
                        {subjectName}
                    </span>
                )}
                <span className="text-gray-700">{activity.subject_type}</span>

                {/* Display reason/source if available (e.g., from Replenishment) */}
                {(attrs._reason || old._reason) && (
                    <span className="text-gray-500 text-xs">
                        (來自 {attrs._reason || old._reason})
                    </span>
                )}
            </span>
        );
    };

    const handleViewDetail = (activity: Activity) => {
        setSelectedActivity(activity);
        setDetailOpen(true);
    };

    const handlePerPageChange = (value: string) => {
        setPerPage(value);
        router.get(
            route('activity-logs.index'),
            { ...filters, per_page: value },
            { preserveState: false, replace: true, preserveScroll: true }
        );
    };

    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('activity-logs.index'),
            { ...filters, sort_by: newSortBy, sort_order: newSortOrder },
            { preserveState: true, replace: true }
        );
    };

    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-main ml-1" />;
        }
        return <ArrowDown className="h-4 w-4 text-primary-main ml-1" />;
    };

    return (
        <AuthenticatedLayout
            breadcrumbs={[
                { label: '系統管理', href: '#' },
                { label: '操作紀錄', href: route('activity-logs.index'), isPage: true },
            ]}
        >
            <Head title="操作紀錄" />

            <div className="container mx-auto p-6 max-w-7xl">
                <div className="flex items-center justify-between mb-6">
                    <div>
                        <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                            <FileText className="h-6 w-6 text-primary-main" />
                            操作紀錄
                        </h1>
                        <p className="text-gray-500 mt-1">
                            檢視系統內的所有操作活動，包含新增、修改與刪除紀錄
                        </p>
                    </div>
                </div>

                <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 className="w-[180px]">
                                    <button
                                        onClick={() => handleSort('created_at')}
                                        className="flex items-center gap-1 hover:text-gray-900 transition-colors"
                                    >
                                        時間 <SortIcon field="created_at" />
                                    </button>
                                </TableHead>
                                <TableHead className="w-[150px]">操作人員</TableHead>
                                <TableHead>描述</TableHead>
                                <TableHead className="w-[100px] text-center">動作</TableHead>
                                <TableHead>對象</TableHead>
                                <TableHead className="w-[100px] text-center">操作</TableHead>
                            </TableRow>
                        </TableHeader>
                        <TableBody>
                            {activities.data.length > 0 ? (
                                activities.data.map((activity, index) => (
                                    <TableRow key={activity.id}>
                                        <TableCell className="text-gray-500 font-medium text-center">
                                            {activities.from + index}
                                        </TableCell>
                                        <TableCell className="text-gray-500 font-medium whitespace-nowrap">
                                            {activity.created_at}
                                        </TableCell>
                                        <TableCell>
                                            <span className="font-medium text-gray-900">{activity.causer}</span>
                                        </TableCell>
                                        <TableCell>
                                            {getDescription(activity)}
                                        </TableCell>
                                        <TableCell className="text-center">
                                            <Badge variant="outline" className={getEventBadgeClass(activity.event)}>
                                                {getEventLabel(activity.event)}
                                            </Badge>
                                        </TableCell>
                                        <TableCell>
                                            <Badge variant="outline" className="bg-slate-50 text-slate-600 border-slate-200">
                                                {activity.subject_type}
                                            </Badge>
                                        </TableCell>
                                        <TableCell className="text-center">
                                            <Button
                                                variant="outline"
                                                size="sm"
                                                onClick={() => handleViewDetail(activity)}
                                                className="button-outlined-primary"
                                                title="檢視詳情"
                                            >
                                                <Eye className="h-4 w-4" />
                                            </Button>
                                        </TableCell>
                                    </TableRow>
                                ))
                            ) : (
                                <TableRow>
                                    <TableCell colSpan={6} className="text-center py-8 text-gray-500">
                                        尚無操作紀錄
                                    </TableCell>
                                </TableRow>
                            )}
                        </TableBody>
                    </Table>
                </div>

                <div className="mt-4 flex flex-col sm:flex-row 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-[80px] h-8"
                            showSearch={false}
                        />
                        <span>筆</span>
                    </div>
                    <Pagination links={activities.links} />
                </div>
            </div>

            <ActivityDetailDialog
                open={detailOpen}
                onOpenChange={setDetailOpen}
                activity={selectedActivity}
            />
        </AuthenticatedLayout>
    );
}