import React, { useState } from 'react';
import {
  Box, Container, Typography, Paper,
  TextField, Button, Stack
} from '@mui/material';
import CloudUploadIcon from '@mui/icons-material/CloudUpload';
// Assuming your base.css is in a relative path like src/styles/base/base.css
// If your component is in src/components/Upload.js, this path would be ../styles/base/base.css
// Adjust if your project structure is different.
// For this example, I'll assume it's correctly linked.
// import '../styles/base/base.css'; 

function Upload() {
  const [title, setTitle] = useState('');
  const [file, setFile] = useState(null);

  const handleUpload = () => {
    const formData = new FormData();
    if (file) {
      formData.append('file', file);
    }
    formData.append('title', title);

    // Replace with your actual API endpoint and error handling
    fetch('/api/torrents/upload', {
      method: 'POST',
      body: formData
    })
    .then(response => {
      if (response.ok) {
        // Use a more modern way to show messages, e.g., a Snackbar
        console.log('上传成功'); 
        alert('上传成功 (建议使用Snackbar等UI组件替代alert)');
      } else {
        console.error('上传失败');
        alert('上传失败 (建议使用Snackbar等UI组件替代alert)');
      }
    })
    .catch(error => {
      console.error('上传出错:', error);
      alert('上传出错 (建议使用Snackbar等UI组件替代alert)');
    });
  };

  return (
    <Box sx={{ minHeight: '100vh', py: 4, background: 'linear-gradient(135deg, #2c3e50, #4ca1af)', color: 'white' }}> {/* Moved body styles here for self-containment */}
      <Container maxWidth="sm" sx={{ position: 'relative', zIndex: 10 }}>
        <Typography variant="h4" sx={{ textAlign: 'center', mb: 3, fontWeight: 'bold' }}> {/* Replaced className with sx */}
          ⬆️ 上传种子 · Mini-Tracker
        </Typography>

        <Paper sx={{ position: 'relative', zIndex: 20, padding: '2rem', backgroundColor: 'rgba(30, 30, 30, 0.9)' }}> {/* Replaced className with sx */}
          <Stack spacing={3}> {/* Increased spacing a bit */}
            <TextField
              label="资源名称"
              variant="outlined"
              fullWidth
              value={title}
              onChange={e => setTitle(e.target.value)}
              placeholder="请输入资源名称"
              InputLabelProps={{ 
                sx: { 
                  color: '#ccc',
                  '&.Mui-focused': { // Ensure label color remains consistent when focused
                    color: '#ccc',
                  }
                } 
              }}
              sx={{
                // Root element of the TextField
                backgroundColor: 'transparent', 
                
                // Styles for the HTML input element itself
                '& .MuiInputBase-input': {
                  color: 'white', // Text color
                  backgroundColor: 'transparent', // **** THIS IS THE FIX **** Ensure input background is transparent
                  caretColor: 'white', // Cursor color
                  '&::placeholder': {
                    color: '#bbb',
                    opacity: 1,
                  },
                },
                // Styles for the outlined border
                '& .MuiOutlinedInput-root': {
                  '& fieldset': {
                    borderColor: '#888', // Default border color
                  },
                  '&:hover fieldset': {
                    borderColor: '#aaa', // Border color on hover
                  },
                  '&.Mui-focused fieldset': {
                    borderColor: '#fff', // Border color when focused
                  },
                },
              }}
            />

            <Button
              variant="contained"
              component="label" // Allows the button to act as a label for a hidden input
              startIcon={<CloudUploadIcon />}
              sx={{ backgroundColor: '#00bcd4', color: 'white', '&:hover': { backgroundColor: '#0097a7' } }} // Replaced className with sx
            >
              选择种子文件
              <input
                hidden
                type="file"
                accept=".torrent"
                onChange={e => {
                  if (e.target.files && e.target.files[0]) {
                    setFile(e.target.files[0]);
                  }
                }}
              />
            </Button>
            
            {file && (
              <Typography variant="body2" sx={{ color: '#eee', textAlign: 'center' }}>
                已选择文件: {file.name}
              </Typography>
            )}

            <Button
              variant="outlined"
              onClick={handleUpload}
              disabled={!file || !title}
              sx={{ borderColor: 'white', color: 'white', '&:hover': { borderColor: '#ddd', backgroundColor: 'rgba(255,255,255,0.1)'}, '&.Mui-disabled': { borderColor: '#777', color: '#777' } }} // Replaced className with sx
            >
              提交上传
            </Button>
          </Stack>
        </Paper>
      </Container>

      {/* Background bubbles animation - assuming CSS for .bubbles and .bubble is globally available or defined in an imported CSS file */}
      {/* For self-containment, these styles would ideally be JSS or defined in a <style> tag if not using styled-components or similar */}
      <Box className="bubbles" sx={{
         pointerEvents: 'none',
         position: 'fixed', 
         top: 0,
         left: 0,
         width: '100%',
         height: '100%',
         overflow: 'hidden',
         zIndex: 1, // Ensure it's behind the content paper but above the main background
      }}>
        {[...Array(40)].map((_, i) => (
          <Box
            key={i}
            className="bubble" // Assuming .bubble and @keyframes rise are defined in your CSS
            sx={{
              position: 'absolute',
              bottom: '-100px',
              background: 'rgba(255, 255, 255, 0.15)',
              borderRadius: '50%',
              animation: 'rise 20s infinite ease-in', // Make sure @keyframes rise is defined
              width: `${Math.random() * 20 + 10}px`,
              height: `${Math.random() * 20 + 10}px`,
              left: `${Math.random() * 100}%`,
              animationDuration: `${10 + Math.random() * 20}s`,
              animationDelay: `${Math.random() * 5}s`
            }}
          />
        ))}
      </Box>
      {/* Define keyframes if not in external CSS */}
      <style>
        {`
          @keyframes rise {
            0% {
              transform: translateY(0) scale(1);
              opacity: 0.5;
            }
            50% {
              opacity: 1;
            }
            100% {
              transform: translateY(-120vh) scale(0.5);
              opacity: 0;
            }
          }
          body { /* Basic reset if base.css is not loaded */
            margin: 0;
            font-family: 'Roboto', sans-serif;
          }
        `}
      </style>
    </Box>
  );
}

export default Upload;