/**
 *                                                                            
 * Copyright (c) 2011, 2017 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 *                                                                            
 * All rights reserved. This program and the accompanying materials           
 * are made available under the terms of the Eclipse Public License 2.0        
 * which accompanies this distribution, and is available at                  
 * https://www.eclipse.org/legal/epl-2.0/                                 
 *                                 
 * SPDX-License-Identifier: EPL-2.0                                 
 *                                                                            
 * Contributors:   
 * Christophe Loetz (Loetz GmbH&Co.KG) - initial implementation 
 * Jose Dominguez (Compex Systemhaus GmbH) - ongoing development 
 */
package org.eclipse.osbp.blob.service;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import javax.imageio.ImageIO;
import javax.xml.bind.DatatypeConverter;

import org.apache.commons.compress.utils.IOUtils;
import org.eclipse.osbp.blob.component.BlobEvent;
import org.eclipse.osbp.blob.component.BlobUploadComponent;
import org.eclipse.osbp.blob.dtos.BlobDto;
import org.eclipse.osbp.blob.dtos.BlobMappingDto;
import org.eclipse.osbp.dsl.dto.lib.impl.DtoServiceAccess;
import org.eclipse.osbp.jpa.services.Query;
import org.eclipse.osbp.jpa.services.filters.LAnd;
import org.eclipse.osbp.jpa.services.filters.LCompare;
import org.eclipse.osbp.runtime.common.filter.IDTOService;
import org.eclipse.osbp.runtime.common.filter.IQuery;
import org.eclipse.osbp.ui.api.customfields.IBlobEvent;
import org.eclipse.osbp.ui.api.customfields.IBlobService;
import org.eclipse.osbp.ui.api.customfields.IBlobTyping;
import org.eclipse.osbp.ui.api.customfields.IBlobUploadEventListener;
import org.osgi.service.component.annotations.Component;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.vaadin.server.StreamResource;
import com.vaadin.server.StreamResource.StreamSource;
import com.vaadin.shared.ui.label.ContentMode;
import com.vaadin.ui.Label;

/**
 * Provides and persist blob data from and into a database via JPA. For images
 * different sizes are calculated and stored that can be retrieved later to get
 * better performance
 * 
 * @author dominguez
 * 
 */
@Component
public class BlobService implements IBlobService {
	private IDTOService<BlobMappingDto> dtoBlobMappingDtoService;
	private Logger log = LoggerFactory.getLogger(BlobService.class);
	private List<IBlobUploadEventListener> listeners = new ArrayList<>();
	private BlobTypingAPI blobAPI;

	private static final String DEFAULT_EXCEL_ICON = 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	private static final String DEFAULT_WORD_ICON = "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";
	private static final String DEFAULT_PDF_ICON = 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	private static final String DEFAULT_IMAGE = "iVBORw0KGgoAAAANSUhEUgAAACQAAAAhCAYAAACxzQkrAAAABmJLR0QA/wD/AP+gvaeTAAAACXBI	WXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4gECDykfwiMkMQAACalJREFUWMOtl2l0k1Uax//vmoQm	pQulm21KC7ZlRDZBdtQKuA0yjsczI8czeJwPjjNqadOkSbovSZqkLYjiNq7jYVDEGY8OOgKi7Eu1	gmKhtJQuNCUpbbO/Td5lPrRlwr7oPeeee89773Of33vv/7kLgV+Y6hutKFyrha3eQoVCoSkymewv	NEOvJECoAQzwPP9lOBS2Rymjjj3/13zRVm9GUaH+quPRN+M8cjB7Qx0IgkDhWi0+3LKJaG9v35Ca	mvpsmjqNEHgBgsCDJMl4mqZXd3Z2rT7bc7ahf+CYZkLcndK1fNA3DmNBUWEx6mymPIIgKE2B7qux	tjNnzhyYOjX37sSkJDQdaQLHca0AdgOYLJfL75m/cB5kDJv/6quf9ABovJYf4kZgrHYLtJpiWO3m	e1Qq1S5BEBAMctlFhbrWWnPVhqysrL+p1Wrs2bOnQ5KkP+uKDF+P2daaq/LkcsXW+5ffN373N3va	PR7PXZJEDJUYSm8dCADWb3hJ4fe7O5YvX57Y3NyMoSF3YjAQSE5KTtqzePFi1bYvtrUHg8FlJfry	jhpTJZRKJfJfKAQA1JgqLblTc3UA0HqydZ5eV3LoFy+ZxzNQPXPmzImBQBBOp7OcIAinTCF/Zc6c	uaqDBw+KwUCwtsRQ3gEAJYbyi2wZhnmvr69Pl5OTA4Zh5gC4KhB5IzBVNeVTJkyY8NS0O6YTTU1H	zgiCsJGiqGW3pd72uNfnRW9v75ESQ/k7V7NnGMYrCiJoioYkSYpr+SKvrR0zAECuUBjn3T1/4t69	u+H3+xvnzM0ZFEVx87Rp03CipQUMwzw2FnmRqWGdDQDAcdzsmJgYcNwwRFE8dUtAdTYTtBo9rHbT	3IT4hD+JkoSesz2nSo0VLzUdOdk4c+asOK/HC5fLZdBq9L31jXXQFOguGqMgvwgAIEnii1lZkzE4	OIBQKHTolqNs/YZ61u8Pnlr16O/SjzQdxrlzfVMDgYCQkpyyf+VvV8Vv2vxBm9/vWyiTyZ1azZU3	u4rq0uXq9IxPlyxZKt+6dcs2nud/rxyn5F54Ye3Ni3pgYFC/cMGitHAojJ6ebqtRX9ZitZs/WLrk	3vidu3bC7/c1lhornVfbREOhMMuyrO7+vGXyr7Z/OcwNc6+WGSu5W1qyGlNFRkLCxGdmz5pDfP3N	jh5RFF+x2s3zU5JTVnMch87OjpZSY+XGS+1qTVWw2kd2dJqmH8nJzr2vq6sTvb29e8qMlZ9fL4Au	A7KNClnGyovmzJ6btnPXDni9no0lhvIuXuC3zJgxC981N4FhmJWR/WvMlWtMlupnjIYyaDV61Dda	YxiGeT8nOxfNzd+HFQrFk1cS/nUOypGosNvNs19/c6N0uOmwZKu3dIyGvvk/2z6TDhzcL9VaqqvG	hD8KteL9f7wjvfnW61KdzTQfAKpNFVu/+XaXtH3HV5LFWrsGACx1NddlIC6fIRvBC8Nt9yzNyzzZ	2gKns2/G8PCwJzY2bu8jDz2a8q9PP+70+/1LWJmsS1tYjDq7iaVIqn9Z3grVwcP74fV6UwIBf1ZS	UvIXDz3wsHLzR/88wnHcfTKZzFdUWHxdoMtEHQh68nNz75gkCDwcjt7X9LqSo1a7+Y0Zd85K2bd/	N7xe78tlJZVdY/25YHDd7FlzVa5+FwYHB7XFWqPDVm95a9H8JcodO7cLfr/fVl5a5bvRVbpohkyW	qqRx45T78u5dlrl955fngsHgEpZl6WhV9PHs23NxuOlgh1ajz7wgfHPljNjxcTuW3b8i/tPPPjke	CoWWMgwzNz1NvS1hYiIOHdp/wFBcuuBmrjjkiBZGhEnTTH5W5uTMYz/+gEDQ/65RX9Ya5sNvZWRk	ov10GwCsAoA664h2WIbV3DltevyBQ/vAcdz6uNg4N0mSm9PTM3D8+DGRZdnHAaDxpfobB7I3WqEr	0sNWb5mhkCt0LMOi13G2q0RfUWy21mQrZIrZCsU4DAye/1ir0R+z2s3QaQ2w2Sx5E+ITVvsDATgc	Z78vNVa82X++/42sSZOjXS4nAoFAvqZA12u1m7F29NS/ISDNWi0AIBwOb1KrJ6GruxOiKD4GAALP	35uYmEy6XOcQDAY/AgCtRo+XN66jRYhb09LS0dbeCppmHq01V90VMz5mVXp6BlpPnTgqiuImW70F	V9vBr7lkJkv1w7ExcVkURaN/wPUBz/PNI2cQsqKioki32+0mSaILAOob6mi32/PhpIys8R6PBz6f	t1pToOuhGVqXkz01tvnodxLHcesMxaXnbySqrggkCMKC5KQU1uHo8Qu88L5RXyYCAEEQlCiKhCAI	kiQhCADD4dBWdfqkx6LGKXGq7eSPgGiz2s3L4mLjH/f6vejvd31faqx491YfDWTDehsNIEWpVMLj	9XopirxwPSAI4sTQ0JAYGxsbI5fL36tvtPLpqeqV0apoHPupeYCiqD8Wa0u9ALFl4oREdHd1gmGY	VZFXj5sGokhKIghAkiQQxAjGWCPLspucrr5uPswjK3PKjIz0TEoQRZw81bKPIslFRYXFx2tMFesS	JyaND3JBBLlgSeFabY+t3nLh6nHTQC8+XyAA6PH5fFCposcLopANANW1VSgqLPZRFDW9+2znlvbT	pwKnz7T9fM7pWCNBytMWGVpMluo7lMroJ1NTbkN3d+cJSZLeBoBb0c5FOzVJkHsdTsdwemq6or/f	9bTVbt6h1ej5hnVWFORr3QCeiDQqqzACACiKKshQT0o4faYdIT600Vhc5vilD08SAAz6sv+6hwZ/	CnIBJCUlPyEIwmuSJBEF+SNbwnOG5y56n1VV1KLOZloRHR3zNM/zOH/eddRYXLYBv0Ii/n/S102Q	JKIv5/Zc6vxAP846epw0Rf+BYZhda1/UXGRkb6hbKAjC7t/kTiNPd7QhFA5laAp0nb8a0Odf/BuP	PLgKdbba6RRFb1GnTZrCsiz6nA54PO7POY77EJCckkSoWJZ5UKlUPaNOy4DrvBMOR6/eqC+zKFVK0ue9cIZGPpelW5ohmqYpnuex5umnUtLV6mejo1WG+LgEKKOU8Pl8GA5xIknSZNS4cQiFQ+jr64Wrv7/x7b+/0zA05OYjnIsRpXBJXRitj/WRrgTEAJCNCpwiCIKWJElasGBe6rz5d69nWPauaGU0TdM0	GQqHJbd7SPT7/d0/t7RUfbtr9w8A2NGBIx0KAPiIb/xVvo1lKRKIGoVhIurUaFto8dJF2SnJyVMpiooJhUOco9fRsW/vgTYAzCg8Iv5avAKYcA1AIWK2LrsPERHlWCYj6mNRSUa0Rerk0ixeUkqXLNMVtfU/m12KYvwikVEAAAAASUVORK5CYII=";

	private static final String DEFAULTBLOBFILENAME = "osbee.png";
	private static final String DEFAULTBLOBMIMETYPE = "image/png";

	/**
	 * Inner class that extract the width and height values from the specified
	 * resolution string and provides them.
	 * 
	 * @author dominguez
	 * 
	 */
	class ImageBlobResolution {
		int width;
		int height;

		public ImageBlobResolution(String normResolution) {
			super();
			this.width = 0;
			this.height = 0;
			String[] resArr = normResolution.split("x");
			if (resArr.length == 2) {
				try {
					this.width = Integer.parseInt(resArr[0]);
					this.height = Integer.parseInt(resArr[1]);
				} catch (NumberFormatException e) {
					log.error(e.getLocalizedMessage());
				}
			}
		}

	}

	// ***************** Constructor ************

	public BlobService() {
		if (DtoServiceAccess.getService(BlobMappingDto.class) instanceof IDTOService<?>) {
			dtoBlobMappingDtoService = (IDTOService<BlobMappingDto>) DtoServiceAccess.getService(BlobMappingDto.class);
		}
		this.blobAPI = new BlobTypingAPI();
	}

	@Override
	public void addBlobUploadListener(IBlobUploadEventListener listener) {
		listeners.add(listener);
	}

	@Override
	public void removeBlobUploadListener(IBlobUploadEventListener listener) {
		listeners.remove(listener);
	}

	protected synchronized void notifyBlobUploadEvent(IBlobEvent event) {
		for (IBlobUploadEventListener listener : listeners) {
			listener.blobUploaded(event);
		}
	}

	/**
	 * Encodes the byte array representation of the blob into a base64 string
	 * representation.
	 * 
	 * @param data
	 * @return base64 encoded string
	 */
	private String encodeBase64(byte[] data) {
		return DatatypeConverter.printBase64Binary(data);
	}

	/**
	 * Decodes the base 64String into a byte array
	 * 
	 * @param data
	 * @return base64 encoded string
	 */
	private byte[] decodeBase64(byte[] data) {
		return DatatypeConverter.parseBase64Binary(new String(data));
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.osbp.ui.api.customfields.IBlobService#createBlobMappingBlobs(
	 * java.io.InputStream, int)
	 */
	@Override
	public List<Object> createBlobMappingBlobs(InputStream stream, int mimeType) throws IOException {
		return createBlobMappingBlobs(stream, blobAPI.getMimeTypeContentTypeById(mimeType));
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.osbp.ui.api.customfields.IBlobService#createBlobMappingBlobs(
	 * java.io.InputStream, java.lang.String)
	 */
	@Override
	public List<Object> createBlobMappingBlobs(InputStream stream, String mimeType) throws IOException {
		List<Object> blobList = null;
		byte[] bytes = IOUtils.toByteArray(stream);
		// In case of a image blob
		if (isImage(mimeType)) {
			blobList = createImages(bytes, blobAPI, mimeType);
		} else {
			// Otherwise
			blobList = createBlobList(bytes);
		}
		return blobList;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.osbp.ui.api.customfields.IBlobService#createBlobMapping(java.
	 * io.InputStream, java.lang.String, java.lang.String)
	 */
	@Override
	public String createBlobMapping(InputStream stream, String fileName, String mimeType) {
		BlobMappingDto blobMapping = new BlobMappingDto();
		blobMapping.setFileName(fileName);
		blobMapping.setMimeTypeId(blobAPI.getMimeTypeContentTypeId(mimeType));
		try {
			List<Object> blobList = createBlobMappingBlobs(stream, mimeType);
			for (Object obj : blobList) {
				blobMapping.addToBlobsRef((BlobDto) obj);
			}
			dtoBlobMappingDtoService.update(blobMapping);
			IBlobEvent event = new BlobEvent(this, true, blobMapping.getId(), "", fileName);
			notifyBlobUploadEvent(event);
			return blobMapping.getId();
		} catch (IOException e) {
			log.error(e.getLocalizedMessage());
			return null;
		}
	}

	/**
	 * Creates for the specified image blob data by {@code byte[]} the base64
	 * encoded image representation and a resized copy for each of the
	 * predefined resolutions and send them back as a blob list ({@code List<
	 * 
	 * @link Blob}>}).
	 * 
	 * @param bytes
	 * @param blobAPI
	 * @param mimeType
	 * @throws IOException
	 * 
	 */
	private List<Object> createImages(byte[] bytes, BlobTypingAPI blobAPI, String mimeType) throws IOException {
		List<Object> blobList = new ArrayList<>();
		for (int i = 0; i < blobAPI.getNormalizer().size(); i++) {
			ImageBlobResolution imgBlobRes = new ImageBlobResolution(blobAPI.getNormalizerResolutionByListIndex(i));
			// In case of resolution '0' no scaling will be done in 'getImage'
			BufferedImage img = getImage(bytes, imgBlobRes.width, imgBlobRes.height);
			byte[] imageBytes = imageToByteArray(img, mimeType);
			blobList.add(createImageBlob(imageBytes, blobAPI.getNormalizerResolutionIdByListIndex(i)));
		}
		return blobList;
	}

	/**
	 * Converts a {@link BufferedImage} into a byte array of a image.
	 * 
	 * @param image
	 * @param mimeType
	 * @return a converted {@link BufferedImage} to a byte array.
	 * @throws IOException
	 */
	private byte[] imageToByteArray(BufferedImage image, String mimeType) throws IOException {
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		String type = getFormatNameFromMimeType(mimeType);
		ImageIO.write(image, type, bos);
		bos.close();
		return bos.toByteArray();
	}

	/**
	 * 1 Extracts the format name from the mime type definition.
	 * 
	 * @param mimeType
	 * @return format name of the mime type definition
	 */
	private String getFormatNameFromMimeType(String mimeType) {
		String[] mimeTypeSplit = mimeType.split("/");
		return mimeTypeSplit[mimeTypeSplit.length - 1];
	}

	/**
	 * Resizes an image into the specified new width and height if they are not
	 * '0' and convert them from the incoming byte array to a
	 * {@link BufferedImage}.
	 * 
	 * @param bytes
	 * @param newWidth
	 * @param newHeight
	 * @return a resized {@link BufferedImage} corresponding to the specified
	 *         new width and height
	 * @throws IOException
	 */
	private BufferedImage getImage(byte[] bytes, int newWidth, int newHeight) throws IOException {
		ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
		BufferedImage image = ImageIO.read(bis);
		bis.close();
		int imageType = 0;
		if (containsAlphaChannel(image)) {
			imageType = BufferedImage.TYPE_INT_ARGB;
		} else if(containsTransparency(image)) {
			imageType = BufferedImage.TYPE_INT_ARGB_PRE;
		} else {
			imageType = BufferedImage.TYPE_INT_RGB;
		}
		/*
		 * On resolution '0' the newWidth and newHeight is also '0', because no
		 * scaling is required. But on png files its displaying behaviour on a
		 * BIRT report differs from the behaviour on a dialog view. Creating a
		 * BufferedImage with defined width and height avoids this different
		 * displaying behaviour.
		 */
		if (newWidth > 0 && newHeight > 0) {
			Image scaledImage = image.getScaledInstance(newWidth, newHeight, Image.SCALE_AREA_AVERAGING);
			BufferedImage buffered = new BufferedImage(scaledImage.getWidth(null), scaledImage.getHeight(null), imageType);
			buffered.getGraphics().drawImage(scaledImage, 0, 0, null);
			return buffered;
		} else {
			BufferedImage buffered = new BufferedImage(image.getWidth(null), image.getHeight(null), imageType);
			buffered.getGraphics().drawImage(image, 0, 0, null);
			return buffered;
		}
	}

	private static boolean containsAlphaChannel(BufferedImage image) {
		return image.getColorModel().hasAlpha();
	}

	private static boolean containsTransparency(BufferedImage image) {
		for (int i = 0; i < image.getHeight(); i++) {
			for (int j = 0; j < image.getWidth(); j++) {
				if (isTransparent(image, j, i)) {
					return true;
				}
			}
		}
		return false;
	}

	public static boolean isTransparent(BufferedImage image, int x, int y) {
		int pixel = image.getRGB(x, y);
		return (pixel >> 24) == 0x00;
	}

	/**
	 * Creates a new {@link Blob} filled with the specified parameters.
	 * 
	 * @param imageBytes
	 * @param fileName
	 * @param resolutionId
	 * @param mimeTypeId
	 * @return
	 */
	private BlobDto createImageBlob(byte[] imageBytes, int resolutionId) {
		BlobDto blobElement = new BlobDto();
		blobElement.setData(encodeBase64(imageBytes).getBytes());
		blobElement.setResolutionId(resolutionId);
		return blobElement;
	}

	/**
	 * Creates a new {@code List <{@link Blob}>} filled with the specified
	 * parameters.
	 * 
	 * @param dataBytes
	 * @return List<Blob>: List of blob objects
	 */
	private List<Object> createBlobList(byte[] dataBytes) {
		List<Object> blobList = new ArrayList<>();
		BlobDto blobElement = new BlobDto();
		blobElement.setData(dataBytes);
		blobList.add(blobElement);
		return blobList;
	}

	/**
	 * Provides the existing blob ({@link Blob}) from the database for a
	 * specified blob mapping id and a specified resolution id via JPA or
	 * {@code null} if no blob found.
	 * 
	 * @param blobMappingId
	 * @param resolutionId
	 * @return a blob ({@link Blob}) for the specified {@code blobMappingId} and
	 *         {@code resolutionId} or {@code null} if no blob found
	 */
	private BlobDto getBlobById(String blobMappingId, int resolutionId) {
		if (blobMappingId != null && resolutionId >= 0) {
			BlobMappingDto blobMapping = dtoBlobMappingDtoService.get(blobMappingId);
			if (blobMapping != null) {
				return getBlobByResolution(resolutionId, blobMapping);
			}
		}
		return null;
	}

	private BlobDto getBlobByName(String blobMappingName, int resolutionId, int mimeTypeId) {
		if (blobMappingName != null && resolutionId >= 0) {
			IQuery query = new Query(new LAnd(new LCompare.Equal("fileName", blobMappingName),
					new LCompare.Equal("mimeTypeId", mimeTypeId)));
			Collection<BlobMappingDto> blobMappings = dtoBlobMappingDtoService.find(query);
			if (!blobMappings.isEmpty()) {
				Iterator<BlobMappingDto> iter = blobMappings.iterator();
				return getBlobByResolution(resolutionId, iter.next());
			}
		}
		return null;
	}

	private BlobDto getBlobByResolution(int resolutionId, BlobMappingDto blobMapping) {
		for (BlobDto blob : blobMapping.getBlobsRef()) {
			if (isImage(blobMapping.getMimeTypeId())) {
				if (blob.getResolutionId() == resolutionId) {
					return blob;
				}
			} else {
				return blob;
			}
		}
		return null;
	}

	/**
	 * Checks if the mime type by the specified mime type id {@code mimeTypeId}
	 * corresponds to an image.
	 * 
	 * @param mimeTypeId
	 * @return boolean indicating if it is an image
	 */
	@Override
	public boolean isImage(int mimeTypeId) {
		String mimeType = blobAPI.getMimeTypeContentTypeById(mimeTypeId);
		return mimeType.startsWith(IBlobTyping.IMAGE_MIME_TYPE_PREFIX);
	}

	/**
	 * Checks if the mime type by the specified mime type id {@code mimeTypeId}
	 * corresponds to a pdf file.
	 * 
	 * @param mimeTypeId
	 * @return boolean indicating if it is a pdf file
	 */
	@Override
	public boolean isPdf(int mimeTypeId) {
		return mimeTypeId == IBlobTyping.PDF_MIME_TYPE_ID;
	}

	/**
	 * Checks if the mime type by the specified mime type id {@code mimeTypeId}
	 * corresponds to a word file.
	 * 
	 * @param mimeTypeId
	 * @return boolean indicating if it is a word file
	 */
	@Override
	public boolean isWord(int mimeTypeId) {
		return mimeTypeId == IBlobTyping.WORD_DOC_MIME_TYPE_ID || mimeTypeId == IBlobTyping.WORD_DOCX_MIME_TYPE_ID;
	}

	/**
	 * Checks if the mime type by the specified mime type id {@code mimeTypeId}
	 * corresponds to a excel file.
	 * 
	 * @param mimeTypeId
	 * @return boolean indicating if it is a excel file
	 */
	@Override
	public boolean isExcel(int mimeTypeId) {
		return mimeTypeId == IBlobTyping.EXCEL_XLS_MIME_TYPE_ID || mimeTypeId == IBlobTyping.EXCEL_XLSX_MIME_TYPE_ID;
	}

	/**
	 * Checks if the mime type corresponds to an image.
	 * 
	 * @param mimeTypeId
	 * @return boolean indicating if it is an image
	 */
	@Override
	public boolean isImage(String mimeType) {
		return mimeType.startsWith(IBlobTyping.IMAGE_MIME_TYPE_PREFIX);
	}

	/**
	 * Provides the base 64 encoded string representation of a specific blob in
	 * a specific resolution.
	 * 
	 * In case of an image mime type it is the base 64 encoded string of the
	 * image and otherwise a defined image for each mime type representing them.
	 * 
	 * @param blob
	 * @return
	 */

	private String getBase64ValueFromBlob(BlobDto blob) {
		assert blob != null : "blobDto must not be null";

		if (isImage(blob.getBlobMapping().getMimeTypeId())) {
			return getImageHTMLWithBase64EndodedData(blob.getData(), "",
					blobAPI.getMimeTypeContentTypeById(blob.getBlobMapping().getMimeTypeId()));
		} else if (isPdf(blob.getBlobMapping().getMimeTypeId())) {
			return getImageHTMLWithBase64EndodedData(getDefaultPdfIconBase64String(),
					blob.getBlobMapping().getFileName(),
					blobAPI.getMimeTypeContentTypeById(blob.getBlobMapping().getMimeTypeId()));
		} else if (isExcel(blob.getBlobMapping().getMimeTypeId())) {
			return getImageHTMLWithBase64EndodedData(getDefaultExcelIconBase64String(),
					blob.getBlobMapping().getFileName(),
					blobAPI.getMimeTypeContentTypeById(blob.getBlobMapping().getMimeTypeId()));
		} else if (isWord(blob.getBlobMapping().getMimeTypeId())) {
			return getImageHTMLWithBase64EndodedData(getDefaultWordIconBase64String(),
					blob.getBlobMapping().getFileName(),
					blobAPI.getMimeTypeContentTypeById(blob.getBlobMapping().getMimeTypeId()));
		} else {
			return getImageHTMLWithBase64EndodedData(getDefaultImageBase64String(), blob.getBlobMapping().getFileName(),
					blobAPI.getMimeTypeContentTypeById(blob.getBlobMapping().getMimeTypeId()));
		}
	}

	/**
	 * Creates a {@link Label} including the representation of a default image
	 * (base64 encoded) as placeholder for a not yet existing blob that could be
	 * visualize. It is primary used when this {@link BlobUploadComponent} is
	 * newly created to upload a blob. Than no blob is available to be
	 * visualized.
	 * 
	 * @return a default placeholder image within a Label
	 */
	@SuppressWarnings("unused")
	private Label getDefaultImageLabel() {
		return new Label(getImageHTMLWithBase64EndodedData(getDefaultImageBase64String(), DEFAULTBLOBFILENAME,
				DEFAULTBLOBMIMETYPE), ContentMode.HTML);
	}

	/**
	 * Provides the HTML-Image-Tag used as input for the {@link Label} of this
	 * ui component based on an specified base64 encoded byte array, the
	 * filename of the blob and it´s mime type.
	 * 
	 * @param encodeBase64Bytes
	 * @param fileName
	 * @param mimeType
	 * @return
	 */
	private String getImageHTMLWithBase64EndodedData(byte[] encodeBase64Bytes, String fileName, String mimeType) {
		String encodeBase64 = new String(encodeBase64Bytes);
		return getImageHTMLWithBase64EndodedData(encodeBase64, fileName, mimeType);
	}

	/**
	 * Provides the HTML-Image-Tag used as input for the {@link Label} of this
	 * ui component based on an specified base64 encoded string, the filename of
	 * the blob and it´s mime type.
	 * 
	 * @param base64Str
	 * @param fileName
	 * @param mimeType
	 * @return
	 */
	private String getImageHTMLWithBase64EndodedData(String base64Str, String fileName, String mimeType) {
		return "data:" + mimeType + ";base64," + base64Str;
	}

	/**
	 * Provides the base64 encoded string representation of the default
	 * placeholder image (Compex-Logo)
	 * 
	 * @return the base64 encoded string representation of the default
	 *         placeholder image
	 */
	private String getDefaultImageBase64String() {
		return DEFAULT_IMAGE;
	}

	/**
	 * Provides the base64 encoded string representation of the default
	 * placeholder pdf icon
	 * 
	 * @return the base64 encoded string representation of the default
	 *         placeholder pdf icon
	 */
	private String getDefaultPdfIconBase64String() {
		return DEFAULT_PDF_ICON;
	}

	/**
	 * Provides the base64 encoded string representation of the default
	 * placeholder word icon
	 * 
	 * @return the base64 encoded string representation of the default
	 *         placeholder word icon
	 */
	private String getDefaultWordIconBase64String() {
		return DEFAULT_WORD_ICON;
	}

	/**
	 * Provides the base64 encoded string representation of the default
	 * placeholder excel icon
	 * 
	 * @return the base64 encoded string representation of the default
	 *         placeholder excel icon
	 */
	private String getDefaultExcelIconBase64String() {
		return DEFAULT_EXCEL_ICON;
	}

	@Override
	public String getImage(String uuid, int resolutionId) {
		BlobDto blob = getBlobById(uuid, resolutionId);
		if (blob != null) {
			return "<img src=\"" + getBase64ValueFromBlob(blob) + "\" alt=\"Encoded image in Base64\">";
		}
		return null;
	}

	@Override
	public String getBirtImage(String uuid, int resolutionId) {
		BlobDto blob = getBlobById(uuid, resolutionId);
		if (blob != null) {
			return getBase64ValueFromBlob(blob);
		}
		return null;
	}

	@Override
	public StreamResource getResource(String uuid, int resolutionId) {
		BlobDto blob = getBlobById(uuid, resolutionId);
		if (blob != null) {
			return new StreamResource(new StreamSource() {
				private static final long serialVersionUID = 1L;

				@Override
				public InputStream getStream() {
					if (isImage(blob.getBlobMapping().getMimeTypeId())) {
						return new ByteArrayInputStream(decodeBase64(blob.getData()));
					} else {
						return new ByteArrayInputStream(blob.getData());
					}
				}
			}, blob.getBlobMapping().getFileName());
		}
		return null;
	}

	@Override
	public int getNormalizerResolutionIdByName(String displayResolution) {
		return blobAPI.getNormalizerResolutionIdByName(displayResolution);
	}

	@Override
	public BufferedImage getBufferedImage(String uuid, int resolutionId) {
		BlobDto blob = getBlobById(uuid, resolutionId);
		if (blob != null) {
			InputStream in = new ByteArrayInputStream(decodeBase64(blob.getData()));
			try {
				return ImageIO.read(in);
			} catch (IOException e) {
				// bad luck
			}
		}
		return null;
	}

	@Override
	public String getBase64Image(String uuid, int resolutionId) {
		BlobDto blob = getBlobById(uuid, resolutionId);
		if (blob != null) {
			return Arrays.toString(blob.getData());
		}
		return null;
	}

	@Override
	public BufferedImage getBufferedImageByName(String name, int resolutionId, String mimeType) {
		BlobDto blob = getBlobByName(name, resolutionId, blobAPI.getMimeTypeContentTypeId(mimeType));
		if (blob != null) {
			InputStream in = new ByteArrayInputStream(decodeBase64(blob.getData()));
			try {
				return ImageIO.read(in);
			} catch (IOException e) {
				// bad luck
			}
		}
		return null;
	}

	@Override
	public String getBase64ImageByName(String name, int resolutionId, String mimeType) {
		BlobDto blob = getBlobByName(name, resolutionId, blobAPI.getMimeTypeContentTypeId(mimeType));
		if (blob != null) {
			return Arrays.toString(blob.getData());
		}
		return null;
	}

	@Override
	public byte[] getByteArrayImage(String uuid, int resolutionId) {
		BlobDto blob = getBlobById(uuid, resolutionId);
		if (blob != null) {
			return decodeBase64(blob.getData());
		}
		return null;
	}
}