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import React from 'react';
import { useNavigate } from 'react-router-dom';
import imageCompression from 'browser-image-compression';
import Button from '@mui/material/Button';

const Dashboard = () => {
  const navi = useNavigate();

  const handleImageChange = async (e) => {
    const files = e.target.files;
    const newImages = Array.from(files);

    try {
      const existingImagesString = sessionStorage.getItem('uploadedImages');
      const existingImages = existingImagesString ? JSON.parse(existingImagesString) : [];

      const compressedImages = await Promise.all(
        newImages.map(async (image) => {
          if (image.size > 2 * 1024 * 1024) {
            // Compress image if size exceeds 2 MB
            const compressedImage = await imageCompression(image, {
              maxSizeMB: 2,
              useWebWorker: true,
            });

            // Convert compressed image to base64 string
            return new Promise((resolve, reject) => {
              const reader = new FileReader();
              reader.readAsDataURL(compressedImage);
              reader.onloadend = () => {
                resolve(reader.result);
              };
              reader.onerror = reject;
            });
          } else {
            // Convert image to base64 string directly
            return new Promise((resolve) => {
              const reader = new FileReader();
              reader.readAsDataURL(image);
              reader.onloadend = () => {
                resolve(reader.result);
              };
            });
          }
        })
      );

      // Merge old and new images
      const allImages = [...existingImages, ...compressedImages];

      // Store all images in session storage
      sessionStorage.setItem('uploadedImages', JSON.stringify(allImages));

      // Reload the window (if needed)
      window.location.reload();
    } catch (err) {
      console.log(err);
      // Handle error, maybe show a notification to the user
    }
  };

  return (
    <>
      <header className="dashboard-header">
        <nav>
          <div className="dashboard-nav-left">
            <Button variant="contained" onClick={() => navi('/Dashboard')}>Dashboard</Button><br />
            <br />
            <input type="file" onChange={handleImageChange} multiple className="dashboard-upload-input" />
            <br />
            <br />
            <Button variant="contained" onClick={() => navi('/FetchImage')}>Images</Button><br />
          </div>
          <div className="dashboard-nav-right">
            <p className="dashboard-welcome-message">Welcome !!!!!  {localStorage.getItem('name')}</p>
            <br />
            <Button variant="contained" onClick={() => navi('/')}>Logout</Button>
          </div>
        </nav>
      </header>

      <body className='dashbody'>
        <img className='dash-image' src='https://tse4.mm.bing.net/th/id/OIP.gnzDFoI_laBxZ1dHFjgbOgHaHa?w=180&h=180&c=7&r=0&o=5&pid=1.7' alt="Weather Logo" />
        <h1 className="app-name">Weather APP</h1>
        <Button variant="contained" onClick={() => navi('/Weatherdata')}>Weather Search</Button>
      </body>
    </>
  );
};

export default Dashboard;
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