'use client';

import React, { useEffect, useRef, useState } from 'react';
import axios from 'axios';
import { DataTable } from 'primereact/datatable';
import { Column } from 'primereact/column';
import { Sidebar } from 'primereact/sidebar';
import { Button } from 'primereact/button';
import { Tag } from 'primereact/tag';
import { Toast } from 'primereact/toast';
import { Paginator, PaginatorPageChangeEvent } from 'primereact/paginator';
import { Card } from 'primereact/card';
import { TabView, TabPanel } from 'primereact/tabview'; // ✅ TabView 导入

import './notification.scss';

interface Notification {
  notificationId: number;
  title: string;
  content: string;
  createAt: string;
  isRead: boolean;
  triggeredBy: number;
  relatedId: number;
}

export default function NotificationPage() {
  const toast = useRef<Toast>(null);
  const [notifications, setNotifications] = useState<Notification[]>([]);
  const [selectedNotification, setSelectedNotification] = useState<Notification | null>(null);
  const [visible, setVisible] = useState<boolean>(false);
  const [activeTab, setActiveTab] = useState<number>(0); // ✅ 当前 Tab 下标

  // 分页相关
  const [first, setFirst] = useState<number>(0);
  const [rows, setRows] = useState<number>(5);
  const [totalRecords, setTotalRecords] = useState<number>(0);

  // 加载数据
  const fetchNotifications = async () => {
    try {
      const pageNumber = first / rows + 1;
      const res = await axios.get(process.env.PUBLIC_URL + '/notification', {
        params: { pageNumber, rows, userId: 22301145 },
      });
      const { records, total } = res.data;
      setNotifications(records);
      setTotalRecords(total);
    } catch (error) {
      console.error('无法获取通知数据', error);
      toast.current?.show({ severity: 'error', summary: '加载失败', detail: '无法获取通知数据' });
    }
  };

  useEffect(() => {
    fetchNotifications();
  }, [first, rows]); // ✅ 加入分页依赖

  const handleRead = async (id: number) => {
    try {
      await axios.post(process.env.PUBLIC_URL + '/notification/read', { notificationId: id });
      setNotifications(prev =>
        prev.map(n => (n.notificationId === id ? { ...n, isRead: true } : n))
      );
    } catch (error) {
      console.error('已读失败', error);
      toast.current?.show({ severity: 'error', summary: '设置已读失败' });
    }
  };

  const handleDelete = async (id: number) => {
    try {
      await axios.delete(process.env.PUBLIC_URL + '/notification', { data: { notificationId: id } });
      setNotifications(prev => prev.filter(n => n.notificationId !== id));
      toast.current?.show({ severity: 'success', summary: '删除成功' });
    } catch (error) {
      console.error('删除失败', error);
      toast.current?.show({ severity: 'error', summary: '删除失败' });
    }
  };

  const openSidebar = (notification: Notification) => {
    if (!notification.isRead) handleRead(notification.notificationId);
    setSelectedNotification(notification);
    setVisible(true);
  };

  const readTemplate = (rowData: Notification) => (
    <Tag value={rowData.isRead ? '已读' : '未读'} severity={rowData.isRead ? undefined : 'warning'} />
  );

  const actionTemplate = (rowData: Notification) => (
    <div className="actions">
      {!rowData.isRead && (
        <Button
          icon="pi pi-check"
          text
          severity="success"
          onClick={() => handleRead(rowData.notificationId)}
          tooltip="标记为已读"
        />
      )}
      <Button icon="pi pi-times" severity="danger" text onClick={() => handleDelete(rowData.notificationId)} />
    </div>
  );

  const onPageChange = (e: PaginatorPageChangeEvent) => {
    setFirst(e.first);
    setRows(e.rows);
  };

  const unreadNotifications = notifications.filter(n => !n.isRead);
  const readNotifications = notifications.filter(n => n.isRead);

  return (
    <div className="notification-page">
      <Toast ref={toast} />
      <h2>系统通知</h2>

      <TabView activeIndex={activeTab} onTabChange={(e) => setActiveTab(e.index)}>
        <TabPanel header="未读通知">
          <DataTable value={unreadNotifications} paginator={false} emptyMessage="暂无未读通知">
            <Column field="title" header="标题" body={(row) => (
              <span className="title-link" onClick={() => openSidebar(row)}>{row.title}</span>
            )} />
            <Column field="createAt" header="时间" />
            <Column field="isRead" header="状态" body={readTemplate} />
            <Column header="操作" style={{ width: '120px', textAlign: 'center' }} body={actionTemplate} />
          </DataTable>
        </TabPanel>
        <TabPanel header="已读通知">
          <DataTable value={readNotifications} paginator={false} emptyMessage="暂无已读通知">
            <Column field="title" header="标题" body={(row) => (
              <span className="title-link" onClick={() => openSidebar(row)}>{row.title}</span>
            )} />
            <Column field="createAt" header="时间" />
            <Column field="isRead" header="状态" body={readTemplate} />
            <Column header="操作" style={{ width: '120px', textAlign: 'center' }} body={actionTemplate} />
          </DataTable>
        </TabPanel>
      </TabView>

      <Paginator
        className="Paginator"
        first={first}
        rows={rows}
        totalRecords={totalRecords}
        onPageChange={onPageChange}
        rowsPerPageOptions={[5, 10, 20]}
      />

      <Sidebar visible={visible} position="right" onHide={() => setVisible(false)} className="p-sidebar-md">
        {selectedNotification && (
          <Card title={selectedNotification.title} subTitle={selectedNotification.createAt}>
            <p className="m-0">{selectedNotification.content}</p>
          </Card>
        )}
      </Sidebar>
    </div>
  );
}