import { 
  Box, 
  Button, 
  Card, 
  CardContent, 
  Grid, 
  LinearProgress, 
  Table, 
  TableBody, 
  TableCell, 
  TableContainer, 
  TableHead, 
  TableRow, 
  Typography, 
  styled 
} from '@mui/material';
import { useTranslation } from 'react-i18next';
import LanguageSwitcher from '../components/LanguageSwitcher';

const StyledCard = styled(Card)({
  height: '100%',
  display: 'flex',
  flexDirection: 'column',
  boxShadow: '0 2px 8px rgba(0,0,0,0.1)',
  borderRadius: '8px',
});

const CardTitle = styled(Typography)({
  fontSize: '1rem',
  fontWeight: 'bold',
  marginBottom: '16px',
});

const MetricsContainer = styled(Box)({
  display: 'flex',
  justifyContent: 'space-between',
  marginBottom: '16px',
});

const Metric = styled(Box)({
  display: 'flex',
  flexDirection: 'column',
});

const MetricValue = styled(Typography)({
  fontSize: '1.5rem',
  fontWeight: 'bold',
});

const MetricLabel = styled(Typography)({
  fontSize: '0.75rem',
  color: '#666',
});

const ProgressContainer = styled(Box)({
  marginBottom: '16px',
});

const ProgressLabel = styled(Box)({
  display: 'flex',
  justifyContent: 'space-between',
  fontSize: '0.65rem',
  marginBottom: '4px',
});

const StyledLinearProgress = styled(LinearProgress)({
  height: '8px',
  borderRadius: '4px',
});

const StatusPill = styled(Box)<{ status?: string }>(({ status }) => ({
  display: 'inline-block',
  padding: '4px 8px',
  borderRadius: '12px',
  fontSize: '0.65rem',
  fontWeight: 'bold',
  backgroundColor: status === 'OK' ? '#e6f7ed' : '#ffebee',
  color: status === 'OK' ? '#00a389' : '#d32f2f',
}));

const InlineNote = styled('span')({
  fontSize: '0.75rem',
  color: '#666',
  fontWeight: 'normal',
  marginLeft: '4px',
});

// 模拟数据
const recentQueries = [
  { query: 'How to reset device firmware?', latency: 732, source: 'manual.pdf', time: '09:21', status: 'OK' },
  { query: 'List authentication failure codes', latency: 801, source: 'auth_guide.html', time: '09:18', status: 'OK' },
  { query: 'Can we purge stale vectors?', latency: 915, source: 'system_kb', time: '09:10', status: 'OK' },
  { query: 'Explain retrieval scoring logic', latency: 845, source: 'design_notes', time: '08:57', status: 'OK' },
  { query: 'Pipeline concurrency limits?', latency: 1042, source: 'ops_doc', time: '08:43', status: 'OK' },
];

const Home = () => {
  const { t } = useTranslation();
  
  return (
    <Box className="p-6">
      {/* Header with Language Switcher */}
      <Box className="flex justify-between items-center mb-6">
        <Typography variant="h4" className="font-bold text-gray-800">
          {t('navigation.dashboard')}
        </Typography>
        <LanguageSwitcher />
      </Box>
      
      <Grid container spacing={3}>
        {/* Knowledge Base Status Card */}
        <Grid size={{ xs: 12, md: 6, lg: 4 }}>
          <StyledCard>
            <CardContent>
              <CardTitle>Knowledge Base Status</CardTitle>
              <MetricsContainer>
                <Metric>
                  <MetricLabel>Documents</MetricLabel>
                  <MetricValue>4,218</MetricValue>
                </Metric>
                <Metric>
                  <MetricLabel>Sources</MetricLabel>
                  <MetricValue>17</MetricValue>
                </Metric>
                <Metric>
                  <MetricLabel>Vectors</MetricLabel>
                  <MetricValue>1.2M</MetricValue>
                </Metric>
              </MetricsContainer>
              
              <ProgressContainer>
                <ProgressLabel>
                  <span>Sync Progress</span>
                  <span>62%</span>
                </ProgressLabel>
                <StyledLinearProgress variant="determinate" value={62} />
              </ProgressContainer>
              
              <Button 
                variant="contained" 
                fullWidth 
                sx={{ 
                  backgroundColor: '#1a1a2e',
                  '&:hover': { backgroundColor: '#2a2a3e' }
                }}
              >
                Create New Knowledge Base
              </Button>
            </CardContent>
          </StyledCard>
        </Grid>
        
        {/* Recent Activity Card */}
        <Grid size={{ xs: 12, md: 6, lg: 4 }}>
          <StyledCard>
            <CardContent>
              <CardTitle>
                Recent Activity <InlineNote>(latest 24h)</InlineNote>
              </CardTitle>
              <Box sx={{ fontSize: '0.7rem', lineHeight: 1.8 }}>
                <Box>152 user queries processed</Box>
                <Box>87 new documents ingested</Box>
                <Box>4 pipeline adjustments</Box>
              </Box>
              <Box sx={{ marginTop: 'auto', fontSize: '0.65rem', opacity: 0.75, mt: 2 }}>
                Latency stable at p95 820ms
              </Box>
            </CardContent>
          </StyledCard>
        </Grid>
        
        {/* Model Overview Card */}
        <Grid size={{ xs: 12, md: 6, lg: 4 }}>
          <StyledCard>
            <CardContent>
              <CardTitle>Model Overview</CardTitle>
              <Box sx={{ display: 'flex', flexDirection: 'column', gap: '0.4rem', fontSize: '0.7rem' }}>
                <Box>Embedding Model: <Box component="strong" sx={{ fontWeight: 'bold' }}>text-embedding-3-large</Box></Box>
                <Box>Generator: <Box component="strong" sx={{ fontWeight: 'bold' }}>gpt-4o-mini</Box></Box>
                <Box>Reranker: <Box component="strong" sx={{ fontWeight: 'bold' }}>cross-encoder-v2</Box></Box>
                <Box>Chunking: 512 tokens</Box>
                <Box>Retriever Top-K: 8</Box>
              </Box>
              <StatusPill status="OK" sx={{ mt: 1 }}>Healthy</StatusPill>
            </CardContent>
          </StyledCard>
        </Grid>
        
        {/* Recent RAG Queries Table */}
        <Grid size={12}>
          <StyledCard>
            <CardContent>
              <CardTitle>
                Recent RAG Queries <InlineNote>(latest 5)</InlineNote>
              </CardTitle>
              <TableContainer>
                <Table size="small">
                  <TableHead>
                    <TableRow>
                      <TableCell>Query</TableCell>
                      <TableCell>Latency (ms)</TableCell>
                      <TableCell>Source</TableCell>
                      <TableCell>Time</TableCell>
                      <TableCell>Status</TableCell>
                    </TableRow>
                  </TableHead>
                  <TableBody>
                    {recentQueries.map((row, index) => (
                      <TableRow key={index}>
                        <TableCell>{row.query}</TableCell>
                        <TableCell>{row.latency}</TableCell>
                        <TableCell>{row.source}</TableCell>
                        <TableCell>{row.time}</TableCell>
                        <TableCell>
                          <StatusPill status={row.status}>{row.status}</StatusPill>
                        </TableCell>
                      </TableRow>
                    ))}
                  </TableBody>
                </Table>
              </TableContainer>
            </CardContent>
          </StyledCard>
        </Grid>
      </Grid>
    </Box>
  );
};

export default Home;