import { HelpCircle, X } from 'lucide-react';
import React, { ReactNode, useEffect, useRef, useState } from 'react';
import { createPortal } from 'react-dom';
import { Box } from '@/ui/Box';
import { Heading } from '@/ui/Heading';
import { Icon } from '@/ui/Icon';
import { IconButton } from '@/ui/IconButton';
import { Surface } from '@/ui/Surface';

export interface InfoFlyoutProps {
  isOpen: boolean;
  onClose: () => void;
  title: string;
  children: ReactNode;
  anchorRef: React.RefObject<HTMLElement>;
}

export const InfoFlyout = ({ isOpen, onClose, title, children, anchorRef }: InfoFlyoutProps) => {
  const [position, setPosition] = useState({ top: 0, left: 0 });
  const flyoutRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (isOpen && anchorRef.current) {
      const rect = anchorRef.current.getBoundingClientRect();
      const flyoutWidth = 380;
      const padding = 16;
      
      let left = rect.right + 12;
      let top = rect.top;
      
      if (left + flyoutWidth > window.innerWidth - padding) {
        left = rect.left - flyoutWidth - 12;
      }
      
      setPosition({ top, left });
    }
  }, [isOpen, anchorRef]);

  if (!isOpen) return null;

  return createPortal(
    <Box 
      ref={flyoutRef as any}
      position="fixed" 
      zIndex={100} 
      style={{ top: position.top, left: position.left, width: '24rem' }}
    >
      <Surface variant="muted" rounded="xl" shadow="xl" style={{ border: '1px solid var(--ui-color-border-default)', overflow: 'hidden' }}>
        <Box display="flex" alignItems="center" justifyContent="between" padding={4} bg="var(--ui-color-bg-surface-muted)" style={{ borderBottom: '1px solid var(--ui-color-border-default)' }}>
          <Box display="flex" alignItems="center" gap={2}>
            <Icon icon={HelpCircle} size={4} intent="primary" />
            <Heading level={6}>{title}</Heading>
          </Box>
          <IconButton icon={X} size="sm" variant="ghost" onClick={onClose} title="Close" />
        </Box>
        <Box padding={4} style={{ maxHeight: '20rem', overflowY: 'auto' }}>
          {children}
        </Box>
      </Surface>
    </Box>,
    document.body
  );
};
