package com.exampleapp;

import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.app.Activity;
import android.app.DownloadManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.webkit.CookieManager;
import android.webkit.DownloadListener;
import android.webkit.GeolocationPermissions;
import android.webkit.URLUtil;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;


import android.os.Parcelable;
import android.provider.MediaStore;
import android.util.Log;

import java.io.File;
import java.io.IOException;


public class MainActivity extends AppCompatActivity {
    ActivityResultLauncher<String[]> mPermissionResultLauncher;
    private boolean isReadPermissionGranted=false;
    private boolean isLocationPermissionGranted=false;
    WebView webView;

    private static String file_type     = "*/*";
    private String cam_file_data = null;
    private ValueCallback<Uri> file_data;
    private ValueCallback<Uri[]> file_path;
    private final static int file_req_code = 1;

    public Context context;

    private static final String TAG = MainActivity.class.getSimpleName();

    private static final int FILECHOOSER_RESULTCODE = 1;
    private ValueCallback<Uri> mUploadMessage;
    private Uri mCapturedImageURI = null;

    // the same for Android 5.0 methods only
    private ValueCallback<Uri[]> mFilePathCallback;
    private String mCameraPhotoPath;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        webView = findViewById(R.id.webview);
        webView.setWebViewClient(new WebViewClient());
        webView.loadUrl("Insert your page with file input");

        webView.setWebChromeClient(new WebChromeClient() {
            public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
                callback.invoke(origin, true, false);
            }
            /*-- handling input[type="file"] requests for android API 21+ --*/


            // for Lollipop, all in one
            public boolean onShowFileChooser(
                    WebView webView, ValueCallback<Uri[]> filePathCallback,
                    WebChromeClient.FileChooserParams fileChooserParams) {
                if (mFilePathCallback != null) {
                    mFilePathCallback.onReceiveValue(null);
                }
                mFilePathCallback = filePathCallback;

                Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if (takePictureIntent.resolveActivity(getPackageManager()) != null) {

                    // create the file where the photo should go
                    File photoFile = null;
                    try {
                        photoFile = createImageFile();
                        takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath);
                    } catch (IOException ex) {
                        // Error occurred while creating the File
                        Log.e(TAG, "Unable to create Image File", ex);
                    }

                    // continue only if the file was successfully created
                    if (photoFile != null) {
                        mCameraPhotoPath = "file:" + photoFile.getAbsolutePath();
                        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                                Uri.fromFile(photoFile));
                    } else {
                        takePictureIntent = null;
                    }
                }

                Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
                contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
                contentSelectionIntent.setType("image/*");

                Intent[] intentArray;
                if (takePictureIntent != null) {
                    intentArray = new Intent[]{takePictureIntent};
                } else {
                    intentArray = new Intent[0];
                }

                Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
                chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
                chooserIntent.putExtra(Intent.EXTRA_TITLE, getString(R.string.image_chooser));
                chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);

                startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);

                return true;
            }

            // creating image files (Lollipop only)
            private File createImageFile() throws IOException {

                File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "DirectoryNameHere");

                if (!imageStorageDir.exists()) {
                    imageStorageDir.mkdirs();
                }

                // create an image file name
                imageStorageDir = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
                return imageStorageDir;
            }

            // openFileChooser for Android 3.0+
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                mUploadMessage = uploadMsg;

                try {
                    File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "DirectoryNameHere");

                    if (!imageStorageDir.exists()) {
                        imageStorageDir.mkdirs();
                    }

                    File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");

                    mCapturedImageURI = Uri.fromFile(file); // save to the private variable

                    final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                    captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
                    // captureIntent.putExtra(MediaStore.EXTRA_SCREEN_ORIENTATION, ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

                    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
                    i.addCategory(Intent.CATEGORY_OPENABLE);
                    i.setType("image/*");

                    Intent chooserIntent = Intent.createChooser(i, getString(R.string.image_chooser));
                    chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{captureIntent});

                    startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
                } catch (Exception e) {
                    Toast.makeText(getBaseContext(), "Camera Exception:" + e, Toast.LENGTH_LONG).show();
                }

            }

            // openFileChooser for Android < 3.0
            public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                openFileChooser(uploadMsg, "");
            }

            // openFileChooser for other Android versions
            /* may not work on KitKat due to lack of implementation of openFileChooser() or onShowFileChooser()
               https://code.google.com/p/android/issues/detail?id=62220
               however newer versions of KitKat fixed it on some devices */
            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                openFileChooser(uploadMsg, acceptType);
            }

        });
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setAllowContentAccess(true);
        webSettings.setAllowFileAccess(true);
        webSettings.setAllowFileAccessFromFileURLs(true);
        webSettings.setAllowUniversalAccessFromFileURLs(true);
        webSettings.setUseWideViewPort(true);
        webSettings.setDomStorageEnabled(true);
mPermissionResultLauncher = registerForActivityResult(new ActivityResultContracts.RequestMultiplePermissions(), new ActivityResultCallback<Map<String, Boolean>>() {
    @Override
    public void onActivityResult(Map<String, Boolean> result) {
        if(result.get(Manifest.permission.READ_EXTERNAL_STORAGE) !=null){
            isReadPermissionGranted = result.get(Manifest.permission.READ_EXTERNAL_STORAGE);
        }
        if(result.get(Manifest.permission.ACCESS_FINE_LOCATION) !=null){
       isLocationPermissionGranted = result.get(Manifest.permission.ACCESS_FINE_LOCATION);
        }
    }

});
webView.setDownloadListener(new DownloadListener()
        {

            @Override


            public void onDownloadStart(String url, String userAgent,
                                        String contentDisposition, String mimeType,
                                        long contentLength) {

                DownloadManager.Request request = new DownloadManager.Request(
                        Uri.parse(url));


                request.setMimeType(mimeType);


                String cookies = CookieManager.getInstance().getCookie(url);


                request.addRequestHeader("cookie", cookies);


                request.addRequestHeader("User-Agent", userAgent);


                request.setDescription("Downloading file...");


                request.setTitle(URLUtil.guessFileName(url, contentDisposition,
                        mimeType));


                request.allowScanningByMediaScanner();


                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                request.setDestinationInExternalPublicDir(
                        Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(
                                url, contentDisposition, mimeType));
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
                Toast.makeText(getApplicationContext(), "Downloading File",
                        Toast.LENGTH_LONG).show();
            }});


 requestPermission();
    }

    private class MywebClient extends WebViewClient{
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
            return super.shouldOverrideUrlLoading(view, request);
        }
    }


    // return here when file selected from camera or from SD Card
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        // code for all versions except of Lollipop
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {

            if (requestCode == FILECHOOSER_RESULTCODE) {
                if (null == this.mUploadMessage) {
                    return;
                }

                Uri result = null;

                try {
                    if (resultCode != RESULT_OK) {
                        result = null;
                    } else {
                        // retrieve from the private variable if the intent is null
                        result = data == null ? mCapturedImageURI : data.getData();
                    }
                } catch (Exception e) {
                    Toast.makeText(getApplicationContext(), "activity :" + e, Toast.LENGTH_LONG).show();
                }

                mUploadMessage.onReceiveValue(result);
                mUploadMessage = null;
            }

        } // end of code for all versions except of Lollipop

        // start of code for Lollipop only
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

            if (requestCode != FILECHOOSER_RESULTCODE || mFilePathCallback == null) {
                super.onActivityResult(requestCode, resultCode, data);
                return;
            }

            Uri[] results = null;

            // check that the response is a good one
            if (resultCode == Activity.RESULT_OK) {
                if (data == null || data.getData() == null) {
                    // If there is not data, then we may have taken a photo
                    if (mCameraPhotoPath != null) {
                        results = new Uri[]{Uri.parse(mCameraPhotoPath)};
                    }
                } else {
                    String dataString = data.getDataString();
                    if (dataString != null) {
                        results = new Uri[]{Uri.parse(dataString)};
                    }
                }
            }

            mFilePathCallback.onReceiveValue(results);
            mFilePathCallback = null;

        } // end of code for Lollipop only

    }


    @Override
    public void onBackPressed() {
        if(webView.isFocused() && webView.canGoBack())
        {
            webView.goBack();
        }else{
            super.onBackPressed();
        }
    }

    private void requestPermission(){

        isReadPermissionGranted = ContextCompat.checkSelfPermission(
                this,
                Manifest.permission.READ_EXTERNAL_STORAGE
        )== PackageManager.PERMISSION_GRANTED;

        isLocationPermissionGranted = ContextCompat.checkSelfPermission(
                this,
                Manifest.permission.ACCESS_FINE_LOCATION
        )== PackageManager.PERMISSION_GRANTED;

    List<String> permissionRequest= new ArrayList<String>();

    if(!isLocationPermissionGranted)
    {
        permissionRequest.add(Manifest.permission.ACCESS_FINE_LOCATION);
    }
        if(!isReadPermissionGranted)
        {
            permissionRequest.add(Manifest.permission.READ_EXTERNAL_STORAGE);
        }
    if (!permissionRequest.isEmpty()){
        mPermissionResultLauncher.launch(permissionRequest.toArray(new String[0]));
    }
    }
}