import React, { useState, useEffect, useMemo } from 'react';
import {
  Outlet,
  useLocation,
} from 'react-router';
import {
  Layout, Button, Space, Badge, Avatar, Dropdown, Typography, Input, Menu,
} from 'antd';
import {
  MenuFoldOutlined,
  MenuUnfoldOutlined,
  BellOutlined,
  VerticalAlignTopOutlined,
  UserOutlined
} from '@ant-design/icons';
import { useAuth } from '../hooks/AuthProvider';
import { useMenu, useMenuSearch, type MenuItem } from '../menu';
import { getGlobalConfig } from '@/client/utils/utils';

const { Header, Sider, Content } = Layout;

/**
 * 主布局组件
 * 包含侧边栏、顶部导航和内容区域
 */
export const MainLayout = () => {
  const { user } = useAuth();
  const [showBackTop, setShowBackTop] = useState(false);
  const location = useLocation();
  
  // 使用菜单hook
  const {
    menuItems,
    userMenuItems,
    openKeys,
    collapsed,
    setCollapsed,
    handleMenuClick: handleRawMenuClick,
    onOpenChange
  } = useMenu();
  
  // 处理菜单点击
  const handleMenuClick = (key: string) => {
    const item = findMenuItem(menuItems, key);
    if (item && 'label' in item) {
      handleRawMenuClick(item);
    }
  };
  
  // 查找菜单项
  const findMenuItem = (items: MenuItem[], key: string): MenuItem | null => {
    for (const item of items) {
      if (!item) continue;
      if (item.key === key) return item;
      if (item.children) {
        const found = findMenuItem(item.children, key);
        if (found) return found;
      }
    }
    return null;
  };
  
  // 使用菜单搜索hook
  const {
    searchText,
    setSearchText,
    filteredMenuItems
  } = useMenuSearch(menuItems);
  
  // 获取当前选中的菜单项
  const selectedKey = useMemo(() => {
    const findSelectedKey = (items: MenuItem[]): string | null => {
      for (const item of items) {
        if (!item) continue;
        if (item.path === location.pathname) return item.key || null;
        if (item.children) {
          const childKey = findSelectedKey(item.children);
          if (childKey) return childKey;
        }
      }
      return null;
    };
    
    return findSelectedKey(menuItems) || '';
  }, [location.pathname, menuItems]);
  
  // 检测滚动位置，控制回到顶部按钮显示
  useEffect(() => {
    const handleScroll = () => {
      setShowBackTop(window.pageYOffset > 300);
    };
    
    window.addEventListener('scroll', handleScroll);
    return () => window.removeEventListener('scroll', handleScroll);
  }, []);
  
  // 回到顶部
  const scrollToTop = () => {
    window.scrollTo({
      top: 0,
      behavior: 'smooth'
    });
  };

  
  // 应用名称 - 从CONFIG中获取或使用默认值
  const appName = getGlobalConfig('APP_NAME') || '应用Starter';
  
  return (
    <Layout style={{ minHeight: '100vh' }}>
      <Sider 
        trigger={null} 
        collapsible 
        collapsed={collapsed}
        width={240}
        className="custom-sider"
        style={{
          overflow: 'auto',
          height: '100vh',
          position: 'fixed',
          left: 0,
          top: 0,
          bottom: 0,
          zIndex: 100,
        }}
      >
        <div className="p-4">
          <Typography.Title level={2} className="text-xl font-bold truncate">
            {collapsed ? '应用' : appName}
          </Typography.Title>
          
          {/* 菜单搜索框 */}
          {!collapsed && (
            <div className="mb-4">
              <Input.Search
                placeholder="搜索菜单..."
                allowClear
                value={searchText}
                onChange={(e) => setSearchText(e.target.value)}
              />
            </div>
          )}
        </div>
        
        {/* 菜单列表 */}
        <Menu
          theme='light'
          mode="inline"
          items={filteredMenuItems}
          openKeys={openKeys}
          selectedKeys={[selectedKey]}
          onOpenChange={onOpenChange}
          onClick={({ key }) => handleMenuClick(key)}
          inlineCollapsed={collapsed}
        />
      </Sider>
      
      <Layout style={{ marginLeft: collapsed ? 80 : 240, transition: 'margin-left 0.2s' }}>
        <Header className="p-0 flex justify-between items-center" 
          style={{ 
            position: 'sticky', 
            top: 0, 
            zIndex: 99, 
            boxShadow: '0 1px 4px rgba(0,21,41,0.08)',
          }}
        >
          <Button
            type="text"
            icon={collapsed ? <MenuUnfoldOutlined /> : <MenuFoldOutlined />}
            onClick={() => setCollapsed(!collapsed)}
            className="w-16 h-16"
          />
          
          <Space size="middle" className="mr-4">
            <Badge count={5} offset={[0, 5]}>
              <Button 
                type="text" 
                icon={<BellOutlined />}
              />
            </Badge>
            
            <Dropdown menu={{ items: userMenuItems }}>
              <Space className="cursor-pointer">
                <Avatar 
                  src={user?.avatar || 'https://images.unsplash.com/photo-1535713875002-d1d0cf377fde?q=80&w=40&auto=format&fit=crop'}
                  icon={!user?.avatar && !navigator.onLine && <UserOutlined />}
                />
                <span>
                  {user?.nickname || user?.username}
                </span>
              </Space>
            </Dropdown>
          </Space>
        </Header>
        
        <Content className="m-6" style={{ overflow: 'initial' }}>
          <div className="site-layout-content p-6 rounded-lg">
            <Outlet />
          </div>
          
          {/* 回到顶部按钮 */}
          {showBackTop && (
            <Button
              type="primary"
              shape="circle"
              icon={<VerticalAlignTopOutlined />}
              size="large"
              onClick={scrollToTop}
              style={{
                position: 'fixed',
                right: 30,
                bottom: 30,
                zIndex: 1000,
                boxShadow: '0 3px 6px rgba(0,0,0,0.16)',
              }}
            />
          )}
        </Content>
      </Layout>
    </Layout>
  );
};