package com.example.user.stockmanagementsystem;


import android.graphics.Bitmap;
import android.media.MediaScannerConnection;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;

public class GenerateQR extends AppCompatActivity {

    public final static int QRcodeWidth = 500 ;
    private static final String IMAGE_DIRECTORY = "/QRcodeDemonuts";
    Bitmap bitmap ;
    private EditText etqr;
    private ImageView iv;
    private Button btngenerate,btnback;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.generateqr);

        iv = (ImageView) findViewById(R.id.qrcode);
        etqr = (EditText) findViewById(R.id.etqr);
        btnback = (Button) findViewById(R.id.btnback);
        btngenerate = (Button) findViewById(R.id.btngenerate);
        btnback.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                OnBack();
            }
        });

        btngenerate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(etqr.getText().toString().trim().length() == 0){
                    Toast.makeText(GenerateQR.this, "Enter String!", Toast.LENGTH_SHORT).show();
                }else {
                    try {
                        bitmap = TextToImageEncode(etqr.getText().toString());
                        iv.setImageBitmap(bitmap);
                        String path = saveImage(bitmap);  //give read write permission
                        Toast.makeText(GenerateQR.this, "QRCode saved to -> "+path, Toast.LENGTH_SHORT).show();
                    } catch (WriterException e) {
                        e.printStackTrace();
                    }

                }
            }
        });



    }

    public String saveImage(Bitmap myBitmap) {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
        File wallpaperDirectory = new File(
                Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);
        // have the object build the directory structure, if needed.
        if (!wallpaperDirectory.exists()) {
            wallpaperDirectory.mkdirs();
        }

        try {
            File f = new File(wallpaperDirectory, Calendar.getInstance()
                    .getTimeInMillis() + ".jpg");
            f.createNewFile();
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
            MediaScannerConnection.scanFile(this,
                    new String[]{f.getPath()},
                    new String[]{"image/jpeg"}, null);
            fo.close();
            Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());

            return f.getAbsolutePath();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return "";

    }
    private Bitmap TextToImageEncode(String Value) throws WriterException {
        BitMatrix bitMatrix;
        try {
            bitMatrix = new MultiFormatWriter().encode(
                    Value,
                    BarcodeFormat.DATA_MATRIX.QR_CODE,
                    QRcodeWidth, QRcodeWidth, null
            );

        } catch (IllegalArgumentException Illegalargumentexception) {

            return null;
        }
        int bitMatrixWidth = bitMatrix.getWidth();

        int bitMatrixHeight = bitMatrix.getHeight();

        int[] pixels = new int[bitMatrixWidth * bitMatrixHeight];

        for (int y = 0; y < bitMatrixHeight; y++) {
            int offset = y * bitMatrixWidth;

            for (int x = 0; x < bitMatrixWidth; x++) {

                pixels[offset + x] = bitMatrix.get(x, y) ?
                        getResources().getColor(R.color.black):getResources().getColor(R.color.white);
            }
        }
        Bitmap bitmap = Bitmap.createBitmap(bitMatrixWidth, bitMatrixHeight, Bitmap.Config.ARGB_4444);

        bitmap.setPixels(pixels, 0, 500, 0, 0, bitMatrixWidth, bitMatrixHeight);
        return bitmap;
    }

    public void OnBack() {
        finish();
    }
}