import React, { useState, useRef } from 'react';
import { Menu, Button, Drawer } from 'antd';
import {
  MenuUnfoldOutlined,
  UserOutlined,
  FileSearchOutlined,
  AlertOutlined,
  ToolOutlined,
  PrinterOutlined,
} from '@ant-design/icons';
import type { MenuProps } from 'antd';

interface NavbarFloatProps {
  position?: 'left' | 'right';
  className?: string;
}

const NavbarFloat: React.FC<NavbarFloatProps> = ({
  position = 'left',
  className,
}) => {
  const [open, setOpen] = useState(false);
  const [btnPos, setBtnPos] = useState({ x: 100, y: 100 });

  React.useEffect(() => {
    // 组件挂载后再安全访问 window
    setBtnPos({
      x: window.innerWidth - 96,
      y: window.innerHeight - 96,
    });
  }, []);
  const [dragged, setDragged] = useState(false);
  const dragging = useRef(false);
  const offset = useRef({ x: 0, y: 0 });

  // 拖拽事件
  const onMouseDown = (e: React.MouseEvent) => {
    dragging.current = true;
    setDragged(false);
    offset.current = {
      x: e.clientX - btnPos.x,
      y: e.clientY - btnPos.y,
    };
    document.addEventListener('mousemove', onMouseMove);
    document.addEventListener('mouseup', onMouseUp);
  };

  const onMouseMove = (e: MouseEvent) => {
    if (!dragging.current) return;
    let x = e.clientX - offset.current.x;
    let y = e.clientY - offset.current.y;
    // 限制在窗口内
    x = Math.max(0, Math.min(window.innerWidth - 80, x));
    y = Math.max(0, Math.min(window.innerHeight - 80, y));
    setBtnPos({ x, y });
    setDragged(true); // 标记为拖拽
  };

  const onMouseUp = () => {
    dragging.current = false;
    setTimeout(() => setDragged(false), 100); // 短暂延迟后重置
    document.removeEventListener('mousemove', onMouseMove);
    document.removeEventListener('mouseup', onMouseUp);
  };

  const menuItems = [
    {
      key: 'patient',
      icon: <Button shape="circle" icon={<UserOutlined />} />,
      label: '患者',
    },
    {
      key: 'examination',
      icon: <Button shape="circle" icon={<FileSearchOutlined />} />,
      label: '检查',
    },
    {
      key: 'emergency',
      icon: <Button shape="circle" icon={<AlertOutlined />} />,
      label: '急诊',
    },
    {
      key: 'process',
      icon: <Button shape="circle" icon={<ToolOutlined />} />,
      label: '处理',
    },
    {
      key: 'print',
      icon: <Button shape="circle" icon={<PrinterOutlined />} />,
      label: '打印',
    },
  ];

  const handleClick: MenuProps['onClick'] = (e) => {
    console.log('clicked ', e.key);
    setOpen(false); // 点击菜单后自动关闭抽屉
  };

  const drawerPlacement = position === 'right' ? 'right' : 'left';

  return (
    <>
      {!open && (
        <div
          style={{
            position: 'fixed',
            left: undefined,
            top: undefined,
            right: window.innerWidth - btnPos.x,
            bottom: window.innerHeight - btnPos.y,
            zIndex: 1100,
            cursor: 'grab',
          }}
          className={className}
          onMouseDown={onMouseDown}
        >
          <Button
            type="primary"
            shape="circle"
            size="large"
            icon={<MenuUnfoldOutlined style={{ fontSize: 32 }} />}
            onClick={(e) => {
              e.stopPropagation();
              if (dragged) return; // 拖拽后不弹抽屉
              setOpen(true);
            }}
            style={{
              width: 64,
              height: 64,
              backgroundColor: '#fff',
              color: '#333',
              boxShadow: '0 2px 8px rgba(0,0,0,0.15)',
              display: 'flex',
              alignItems: 'center',
              justifyContent: 'center',
              userSelect: 'none',
            }}
          />
        </div>
      )}
      <Drawer
        placement={drawerPlacement}
        open={open}
        onClose={() => setOpen(false)}
        closable={false}
        width={120}
        maskClosable={true}
        style={{
          top: 0,
          height: '100vh',
        }}
      >
        <Menu
          mode="vertical"
          onClick={handleClick}
          items={menuItems}
          style={{ border: 'none', backgroundColor: 'transparent' }}
        />
      </Drawer>
    </>
  );
};

export default NavbarFloat;