quivr/frontend/app/upload/page.tsx

'use client';
import { useCallback, useState } from 'react';
import { useDropzone } from 'react-dropzone';
import axios from 'axios';

export default function UploadPage() {
  const [message, setMessage] = useState(null);

  const onDrop = useCallback(async (acceptedFiles) => {
    const file = acceptedFiles[0];
    const formData = new FormData();
    formData.append('file', file);
    try {
      const response = await axios.post('http://localhost:8000/upload', formData);
      setMessage({
        type: 'success',
        text: 'File uploaded successfully: ' + JSON.stringify(response.data)
      });
    } catch (error) {
      setMessage({
        type: 'error',
        text: 'Failed to upload file: ' + error.toString()
      });
    }
  }, []);

  const { getRootProps, getInputProps, isDragActive } = useDropzone({ onDrop });

  return (
    <div 
      {...getRootProps()} 
      className="flex flex-col items-center justify-center h-screen bg-gray-100"
    >
      <input {...getInputProps()} />
      <div className="mt-2 p-6 max-w-sm mx-auto bg-white rounded-xl shadow-md flex items-center space-x-4">
        {
          isDragActive
            ? <p className="text-blue-600">Drop the files here...</p>
            : <p className="text-gray-500">Drag 'n' drop some files here, or click to select files</p>
        }
      </div>
      {message && (
        <div className={`mt-4 p-2 rounded ${message.type === 'success' ? 'bg-green-500' : 'bg-red-500'}`}>
          <p className="text-white">{message.text}</p>
        </div>
      )}
    </div>
  );
}