/**
 * Admin Layout with Sidebar
 */
import { useState, useEffect } from 'react';
import { Outlet, useNavigate, useLocation } from 'react-router-dom';
import { Layout, Menu, Avatar, Dropdown, Modal, Form, Input, Button, message } from 'antd';
import {
  MenuFoldOutlined,
  MenuUnfoldOutlined,
  DashboardOutlined,
  DatabaseOutlined,
  DownloadOutlined,
  UserOutlined,
  LogoutOutlined,
  RocketOutlined,
  AppstoreOutlined,
  SettingOutlined,
  TeamOutlined,
  ControlOutlined,
} from '@ant-design/icons';
import type { MenuProps } from 'antd';
import { authAPI, request } from '../../utils/request';
import { auth } from '../../utils/auth';
import { useToast } from '../../contexts/ToastContext';

const { Header, Sider, Content } = Layout;

// Icon mapping
const iconMap: Record<string, any> = {
  dashboard: <DashboardOutlined />,
  database: <DatabaseOutlined />,
  planet: <RocketOutlined />,
  data: <DatabaseOutlined />,
  download: <DownloadOutlined />,
  settings: <SettingOutlined />,
  users: <TeamOutlined />,
  sliders: <ControlOutlined />,
};

export function AdminLayout() {
  const [collapsed, setCollapsed] = useState(false);
  const [menus, setMenus] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);
  const [profileModalOpen, setProfileModalOpen] = useState(false);
  const [passwordModalOpen, setPasswordModalOpen] = useState(false);
  const [profileForm] = Form.useForm();
  const [passwordForm] = Form.useForm();
  const [userProfile, setUserProfile] = useState<any>(null);
  const navigate = useNavigate();
  const location = useLocation();
  const user = auth.getUser();
  const toast = useToast();

  // Load menus from backend
  useEffect(() => {
    loadMenus();
  }, []);

  const loadMenus = async () => {
    try {
      const { data } = await authAPI.getMenus();
      setMenus(data);
    } catch (error) {
      toast.error('加载菜单失败');
    } finally {
      setLoading(false);
    }
  };

  // Convert backend menu to Ant Design menu format
  const convertMenus = (menus: any[], isChild = false): MenuProps['items'] => {
    return menus.map((menu) => {
      const item: any = {
        key: menu.path || menu.name,
        icon: isChild ? null : (iconMap[menu.icon || ''] || null),
        label: menu.title,
      };

      if (menu.children && menu.children.length > 0) {
        item.children = convertMenus(menu.children, true);
      }

      return item;
    });
  };

  const handleMenuClick: MenuProps['onClick'] = ({ key }) => {
    navigate(key);
  };

  const handleLogout = async () => {
    try {
      await authAPI.logout();
      auth.logout();
      toast.success('登出成功');
      navigate('/login');
    } catch (error) {
      // Even if API fails, clear local auth
      auth.logout();
      navigate('/login');
    }
  };

  const handleProfileClick = async () => {
    try {
      const { data } = await request.get('/users/me');
      setUserProfile(data);
      profileForm.setFieldsValue({
        username: data.username,
        email: data.email || '',
        full_name: data.full_name || '',
      });
      setProfileModalOpen(true);
    } catch (error) {
      toast.error('获取用户信息失败');
    }
  };

  const handleProfileUpdate = async (values: any) => {
    try {
      await request.put('/users/me/profile', {
        full_name: values.full_name,
        email: values.email || null,
      });
      toast.success('个人信息更新成功');
      setProfileModalOpen(false);
      // Update local user info
      const updatedUser = { ...user, full_name: values.full_name, email: values.email };
      auth.setUser(updatedUser);
    } catch (error: any) {
      toast.error(error.response?.data?.detail || '更新失败');
    }
  };

  const handlePasswordChange = async (values: any) => {
    try {
      await request.put('/users/me/password', {
        old_password: values.old_password,
        new_password: values.new_password,
      });
      toast.success('密码修改成功');
      setPasswordModalOpen(false);
      passwordForm.resetFields();
    } catch (error: any) {
      toast.error(error.response?.data?.detail || '密码修改失败');
    }
  };

  const userMenuItems: MenuProps['items'] = [
    {
      key: 'profile',
      icon: <UserOutlined />,
      label: '个人信息',
      onClick: handleProfileClick,
    },
    {
      type: 'divider',
    },
    {
      key: 'logout',
      icon: <LogoutOutlined />,
      label: '退出登录',
      onClick: handleLogout,
    },
  ];

  return (
    <Layout style={{ minHeight: '100vh' }}>
      <Sider trigger={null} collapsible collapsed={collapsed}>
        <div
          style={{
            height: 64,
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'center',
            fontSize: 20,
            fontWeight: 'bold',
            color: '#fff',
          }}
        >
          {collapsed ? '🌌' : '🌌 COSMO'}
        </div>
        <Menu
          theme="dark"
          mode="inline"
          selectedKeys={[location.pathname]}
          items={convertMenus(menus)}
          onClick={handleMenuClick}
        />
      </Sider>
      <Layout>
        <Header
          style={{
            padding: '0 16px',
            background: '#fff',
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'space-between',
          }}
        >
          <div
            onClick={() => setCollapsed(!collapsed)}
            style={{ fontSize: 18, cursor: 'pointer' }}
          >
            {collapsed ? <MenuUnfoldOutlined /> : <MenuFoldOutlined />}
          </div>

          <Dropdown menu={{ items: userMenuItems }} placement="bottomRight">
            <div style={{ display: 'flex', alignItems: 'center', cursor: 'pointer' }}>
              <Avatar icon={<UserOutlined />} style={{ marginRight: 8 }} />
              <span>{user?.username || 'User'}</span>
            </div>
          </Dropdown>
        </Header>
        <Content
          style={{
            margin: '16px',
            padding: 24,
            background: '#fff',
            minHeight: 280,
            overflow: 'auto',
            maxHeight: 'calc(100vh - 64px - 32px)',
          }}
        >
          <Outlet />
        </Content>
      </Layout>

      {/* Profile Modal */}
      <Modal
        title="个人信息"
        open={profileModalOpen}
        onCancel={() => setProfileModalOpen(false)}
        footer={null}
        width={500}
      >
        <Form
          form={profileForm}
          layout="vertical"
          onFinish={handleProfileUpdate}
        >
          <Form.Item label="用户名" name="username">
            <Input disabled />
          </Form.Item>
          <Form.Item
            label="昵称"
            name="full_name"
            rules={[{ max: 50, message: '昵称最长50个字符' }]}
          >
            <Input placeholder="请输入昵称" />
          </Form.Item>
          <Form.Item
            label="邮箱"
            name="email"
            rules={[
              { type: 'email', message: '请输入有效的邮箱地址' }
            ]}
          >
            <Input placeholder="请输入邮箱" />
          </Form.Item>
          <Form.Item>
            <Button type="primary" htmlType="submit" style={{ marginRight: 8 }}>
              保存
            </Button>
            <Button onClick={() => setPasswordModalOpen(true)}>
              修改密码
            </Button>
          </Form.Item>
        </Form>
      </Modal>

      {/* Password Change Modal */}
      <Modal
        title="修改密码"
        open={passwordModalOpen}
        onCancel={() => {
          setPasswordModalOpen(false);
          passwordForm.resetFields();
        }}
        footer={null}
        width={450}
      >
        <Form
          form={passwordForm}
          layout="vertical"
          onFinish={handlePasswordChange}
        >
          <Form.Item
            label="当前密码"
            name="old_password"
            rules={[{ required: true, message: '请输入当前密码' }]}
          >
            <Input.Password placeholder="请输入当前密码" />
          </Form.Item>
          <Form.Item
            label="新密码"
            name="new_password"
            rules={[
              { required: true, message: '请输入新密码' },
              { min: 6, message: '密码至少6位' }
            ]}
          >
            <Input.Password placeholder="请输入新密码（至少6位）" />
          </Form.Item>
          <Form.Item
            label="确认新密码"
            name="confirm_password"
            dependencies={['new_password']}
            rules={[
              { required: true, message: '请确认新密码' },
              ({ getFieldValue }) => ({
                validator(_, value) {
                  if (!value || getFieldValue('new_password') === value) {
                    return Promise.resolve();
                  }
                  return Promise.reject(new Error('两次输入的密码不一致'));
                },
              }),
            ]}
          >
            <Input.Password placeholder="请再次输入新密码" />
          </Form.Item>
          <Form.Item>
            <Button type="primary" htmlType="submit" block>
              确认修改
            </Button>
          </Form.Item>
        </Form>
      </Modal>
    </Layout>
  );
}