host-me-app/host-me

package ch.epfl.sweng.hostme.wallet;
 
import static ch.epfl.sweng.hostme.utils.Constants.SLASH;
 
import android.app.Activity;
import android.app.DownloadManager;
import android.content.Context;
import android.net.Uri;
import android.os.Environment;
import android.widget.ImageButton;
import android.widget.Toast;
 
import com.google.firebase.storage.StorageReference;
 
import ch.epfl.sweng.hostme.database.Storage;
 
public class DocumentDownloader {
 
    private static final String DOWNLOAD_SUCCEED_MESSAGE = "Download succeed!";
    private static final String DOWNLOAD_FAILED_MESSAGE = "Download failed!";
    private final Document document;
    private final String uid;
    private final Context context;
 
    public DocumentDownloader(Document document, String uid, Activity activity, Context context) {
        this.document = document;
        this.uid = uid + SLASH;
        this.context = context;
        ImageButton buttonDownload = activity.findViewById(document.getButtonDownloadId());
        buttonDownload.setOnClickListener(view -> this.downloadFile());
    }
 
    /**
     * retrieve the download url from the database from the file path and download the file
     */
    private void downloadFile() {
        String pathString = this.document.getPath() + this.uid + this.document.getFileName() + this.document.getFileExtension();
        StorageReference fileRef = Storage.getStorageReferenceByChild(pathString);
        fileRef.getDownloadUrl().addOnSuccessListener(uri -> {
            this.download(uri.toString());
            Toast.makeText(context, DOWNLOAD_SUCCEED_MESSAGE, Toast.LENGTH_SHORT).show();
        }).addOnFailureListener(exception -> Toast.makeText(context, DOWNLOAD_FAILED_MESSAGE, Toast.LENGTH_SHORT).show());
    }
 
    /**
     * download the file from the given url
     *
     * @param url download url of the file
     */
    private void download(String url) {
        DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
        Uri uri = Uri.parse(url);
        DownloadManager.Request request = new DownloadManager.Request(uri);
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
        request.setDestinationInExternalFilesDir(context, Environment.DIRECTORY_DOWNLOADS, this.document.getFileName() + this.document.getFileExtension());
        downloadManager.enqueue(request);
    }
}