package util;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

public class DownloadHelper {
    private static final String TAG = "Download Task";
    private Context context;

    private String downloadUrl = "", downloadFileName = "", downloadFilePath = "";
    private ProgressDialog progressDialog;
    private DownloadResponce vresponce;

    public interface DownloadResponce {
        public void Responce(String responce);

        public void Error(String responce);
    }

    public DownloadHelper(Context context, String downloadUrl, DownloadResponce vresponce) {
        this.context = context;
        this.vresponce = vresponce;
        this.downloadUrl = downloadUrl;


        downloadFileName = downloadUrl.substring(downloadUrl.lastIndexOf('/'), downloadUrl.length());//Create file name by picking download file name from URL
        Log.e(TAG, downloadFileName);

        //Start Downloading Task
        new DownloadingTask().execute();
    }

    private class DownloadingTask extends AsyncTask<Void, Void, Void> {

        File apkStorage = null;
        File outputFile = null;
        final HostnameVerifier DO_NOT_VERIFY = new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        };

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressDialog = new ProgressDialog(context);
            progressDialog.setMessage("Downloading...");
            progressDialog.show();
        }

        @Override
        protected void onPostExecute(Void result) {
            try {
                if (outputFile != null) {
                    vresponce.Responce(downloadFilePath + "/" + downloadFileName);
                    progressDialog.dismiss();
                    Toast.makeText(context, "Downloaded Successfully", Toast.LENGTH_SHORT).show();
                } else {

                    new Handler().postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            progressDialog.dismiss();
                            vresponce.Error("Download Failed");
                        }
                    }, 3000);

                    Log.e(TAG, "Download Failed");

                }
            } catch (Exception e) {
                e.printStackTrace();

                //Change button text if exception occurs

                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        progressDialog.dismiss();
                        vresponce.Error("Download Failed");
                    }
                }, 3000);
                Log.e(TAG, "Download Failed with Exception - " + e.getLocalizedMessage());

            }


            super.onPostExecute(result);
        }

        @Override
        protected Void doInBackground(Void... arg0) {
            try {
                URL url = new URL(downloadUrl);//Create Download URl
                HttpURLConnection c = null;
                if (url.getProtocol().toLowerCase().equals("https")) {
                    trustAllHosts();
                    HttpsURLConnection https = (HttpsURLConnection) url.openConnection();
                    https.setHostnameVerifier(DO_NOT_VERIFY);
                    c = https;
                } else {
                    c = (HttpURLConnection) url.openConnection();
                }

                c.setRequestMethod("GET");//Set Request Method to "GET" since we are grtting data
                c.connect();//connect the URL Connection

                //If Connection response is not OK then show Logs
                if (c.getResponseCode() != HttpURLConnection.HTTP_OK) {
                    Log.e(TAG, "Server returned HTTP " + c.getResponseCode()
                            + " " + c.getResponseMessage());

                }


                //Get File if SD card is present
                if (new CheckForSDCard().isSDCardPresent()) {
                    downloadFilePath = Environment.getExternalStorageDirectory() + "/CBK";

                    apkStorage = new File(downloadFilePath);
                } else
                    Toast.makeText(context, "Oops!! There is no SD Card.", Toast.LENGTH_SHORT).show();

                //If File is not present create directory
                if (!apkStorage.exists()) {
                    apkStorage.mkdir();
                    Log.e(TAG, "Directory Created.");
                }

                outputFile = new File(apkStorage, downloadFileName);//Create Output file in Main File

                //Create New File if not present
                if (!outputFile.exists()) {
                    outputFile.createNewFile();
                    Log.e(TAG, "File Created");
                }

                FileOutputStream fos = new FileOutputStream(outputFile);//Get OutputStream for NewFile Location

                InputStream is = c.getInputStream();//Get InputStream for connection

                byte[] buffer = new byte[1024];//Set buffer type
                int len1 = 0;//init length
                while ((len1 = is.read(buffer)) != -1) {
                    fos.write(buffer, 0, len1);//Write new file
                }

                //Close all connection after doing task
                fos.close();
                is.close();

            } catch (Exception e) {

                //Read exception if something went wrong
                e.printStackTrace();
                outputFile = null;
                Log.e(TAG, "Download Error Exception " + e.getMessage());
            }

            return null;
        }
    }

    public class CheckForSDCard {
        //Check If SD Card is present or not method
        public boolean isSDCardPresent() {
            if (Environment.getExternalStorageState().equals(

                    Environment.MEDIA_MOUNTED)) {
                return true;
            }
            return false;
        }
    }

    private static void trustAllHosts() {
        // Create a trust manager that does not validate certificate chains
        TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {
            public X509Certificate[] getAcceptedIssuers() {
                return new X509Certificate[]{};
            }

            public void checkClientTrusted(X509Certificate[] chain,
                                           String authType) throws CertificateException {
            }

            public void checkServerTrusted(X509Certificate[] chain,
                                           String authType) throws CertificateException {
            }
        }};

        // Install the all-trusting trust manager
        try {
            SSLContext sc = SSLContext.getInstance("TLS");
            sc.init(null, trustAllCerts, new java.security.SecureRandom());
            HttpsURLConnection
                    .setDefaultSSLSocketFactory(sc.getSocketFactory());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}