content: package act.view;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.Act;
  import com.google.zxing.BarcodeFormat;
  import com.google.zxing.EncodeHintType;
  import com.google.zxing.MultiFormatWriter;
  import com.google.zxing.client.j2se.MatrixToImageWriter;
  import com.google.zxing.common.BitMatrix;
  import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
  import org.osgl.$;
  import org.osgl.http.H;
  import org.osgl.mvc.result.Result;
  import org.osgl.util.E;
  import org.osgl.util.IO;
  import org.osgl.util.S;
  
  import java.util.HashMap;
  import java.util.Map;
  
  public class ZXingResult extends Result {
  
      private BarcodeFormat barcodeFormat;
      private ErrorCorrectionLevel errorCorrectionLevel;
      private int width;
      private int height;
  
      public ZXingResult(String content) {
          this(content, BarcodeFormat.QR_CODE);
      }
  
      public ZXingResult(String content, BarcodeFormat barcodeFormat) {
          this(content, barcodeFormat, null);
      }
  
      public ZXingResult(String content, BarcodeFormat barcodeFormat, ErrorCorrectionLevel errorCorrectionLevel) {
          super(H.Status.OK, content);
          this.barcodeFormat = $.requireNotNull(barcodeFormat);
          this.errorCorrectionLevel = errorCorrectionLevel;
          setDefaultDimension();
      }
  
      public ZXingResult width(int width) {
          this.width = width;
          return this;
      }
  
      public ZXingResult height(int height) {
          this.height = height;
          return this;
      }
  
      public ZXingResult errorCorrectionLevel(ErrorCorrectionLevel level) {
          this.errorCorrectionLevel = level;
          return this;
      }
  
      public ZXingResult barCodeFormat(BarcodeFormat format) {
          this.barcodeFormat = format;
          return this;
      }
  
      @Override
      protected void applyMessage(H.Request request, H.Response response) {
          String msg = this.getMessage();
          this.applyBeforeCommitHandler(request, response);
          if(S.notBlank(msg)) {
              renderCode(response);
          } else {
              IO.close(response.outputStream());
          }
  
          this.applyAfterCommitHandler(request, response);
      }
  
      protected ErrorCorrectionLevel errorCorrectionLevel() {
          return errorCorrectionLevel;
      }
  
      protected BarcodeFormat barcodeFormat() {
          return barcodeFormat;
      }
  
      private void setDefaultDimension() {
          if (barcodeFormat() == BarcodeFormat.QR_CODE) {
              width = 128;
              height = 128;
          } else {
              width = 128;
              height = 96;
          }
      }
  
      private void renderCode(H.Response response) {
          response.contentType("image/png");
          Map<EncodeHintType, Object> hints = new HashMap<>();
          hints.put(EncodeHintType.CHARACTER_SET, Act.appConfig().encoding());
          hints.put(EncodeHintType.MARGIN, 0);
          ErrorCorrectionLevel level = errorCorrectionLevel();
          if (null != level) {
              hints.put(EncodeHintType.ERROR_CORRECTION, level);
          }
          MultiFormatWriter writer = new MultiFormatWriter();
          try {
              BitMatrix bitMatrix = writer.encode(getMessage(), barcodeFormat(), width, height, hints);
              MatrixToImageWriter.writeToStream(bitMatrix, "png", response.outputStream());
          } catch (Exception e) {
              throw E.unexpected(e);
          }
      }
  
      public static ZXingResult barcode(String content) {
          return new ZXingResult(content, BarcodeFormat.CODE_128);
      }
  
      public static ZXingResult qrcode(String content) {
          return new ZXingResult(content, BarcodeFormat.QR_CODE);
      }
  
  }
  