import React from 'react';
import { 
  Card, 
  CardContent, 
  Typography, 
  Link,
  Divider,
  List,
  ListItem,
  ListItemText,
  Radio,
  RadioGroup,
  FormControlLabel
} from '@mui/material';

function NodeContent({ node }) {
  if (!node) return null;

  return (
    <Card>
      <CardContent>
        <Typography variant="h5" gutterBottom>
          {node.title}
        </Typography>
        <Divider />

        {/* 內容區 */}
        <Typography variant="h6" gutterBottom sx={{ mt: 2 }}>
          內容
        </Typography>
        <div dangerouslySetInnerHTML={{ __html: node.content }} />

        {/* 資源連結 */}
        {node.resources && (
          <>
            <Typography variant="h6" gutterBottom sx={{ mt: 2 }}>
              延伸資源
            </Typography>
            <List>
              {node.resources.map((resource, index) => (
                <ListItem key={index}>
                  <ListItemText>
                    <Link href={resource.url} target="_blank" rel="noopener noreferrer">
                      {resource.type}: {resource.url}
                    </Link>
                  </ListItemText>
                </ListItem>
              ))}
            </List>
          </>
        )}

        {/* AI 對話記錄 */}
        {node.aiChats && (
          <>
            <Typography variant="h6" gutterBottom sx={{ mt: 2 }}>
              AI 對話記錄
            </Typography>
            <List>
              {node.aiChats.map((chat, index) => (
                <ListItem key={index}>
                  <ListItemText
                    primary={<strong>Q: {chat.question}</strong>}
                    secondary={`A: ${chat.answer}`}
                  />
                </ListItem>
              ))}
            </List>
          </>
        )}

        {/* 練習區 */}
        {node.exercises && (
          <>
            <Typography variant="h6" gutterBottom sx={{ mt: 2 }}>
              練習題
            </Typography>
            {node.exercises.map((exercise) => (
              <div key={exercise.id}>
                <Typography variant="subtitle1" gutterBottom>
                  {exercise.question}
                </Typography>
                {exercise.type === 'multiple_choice' && (
                  <RadioGroup name={exercise.id}>
                    {exercise.options.map((option, index) => (
                      <FormControlLabel
                        key={index}
                        value={index.toString()}
                        control={<Radio />}
                        label={option}
                      />
                    ))}
                  </RadioGroup>
                )}
              </div>
            ))}
          </>
        )}
      </CardContent>
    </Card>
  );
}

export default NodeContent;