package com.galois.qrstream.qrpipe;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

import javax.imageio.ImageIO;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import com.galois.qrstream.image.YuvImage;
import com.google.common.collect.Lists;


@RunWith(Parameterized.class)
public class QRDecodeRegressionTest {

  private static final FilenameFilter PNG_FILTER = new FilenameFilter(){
    @Override
    public boolean accept(File dir, String name) {
      return name.endsWith("png");
    }
  };

  @Parameters(name = "{0}")
  public static Collection<Object[]> setup() {
    List<Object[]> qrcodes = Lists.newArrayList();

    File testDir = new File("src/test/resources/troublesomeQRCodes");

    for (File file : testDir.listFiles(PNG_FILTER)) {
      qrcodes.add(new Object[]{ file });
    }

    return qrcodes;
  }

  private final File file;

  public QRDecodeRegressionTest(File file) {
    super();
    this.file = file;
  }

  @Test
  public void testDecode() throws IOException, ReceiveException {
    BufferedImage bi = ImageIO.read(file);

    // If this does not throw an exception, everything is fine:
    decodeImage(bi);
  }
  
  /**
   * Decode a qr code from a buffered image.
   * 
   * Catches transmission failure exceptions, and returns null.
   * 
   * @param bi The buffered image to decode.
   * @return
   * @throws ReceiveException
   */
  public static byte[] decodeImage(BufferedImage bi) throws ReceiveException {
    int width = bi.getWidth();
    int height = bi.getHeight();

    YuvImage img = new YuvImage(YuvUtilities.toYUV(bi),
                                width, height);

    BlockingQueue<YuvImage> queue = new ArrayBlockingQueue<YuvImage>(2);
    queue.add(img);

    Receive receive = new Receive(height, width, 100,
        RandomQRDecodeTest.NULL_PROGRESS);

    byte[] result = null;
    try {
      result = receive.decodeQRCodes(queue);
    } catch (ReceiveException e) {
      System.out.println(e.getMessage());
      // this should only happen if receive was expecting more than one QR code:
      if (!e.getMessage().startsWith("Transmission failed")) {
        throw e;
      }
    }
    
    return result;
  }
}

@@ -1454,18 +1454,16 @@
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@@ -1506,25 +1506,24 @@
  image.%0A   *
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@@ -1579,17 +1579,16 @@
 ll.%0A   *
- 
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@@ -2235,50 +2235,8 @@
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@@ -2406,20 +2406,16 @@
 %7D%0A    %7D%0A
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make test less noisy