package fr.mael.jiwigo.dao;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.jdom.Document;
import org.jdom.Element;
import sun.misc.BASE64Encoder;
import fr.mael.jiwigo.Main;
import fr.mael.jiwigo.om.Image;
import fr.mael.jiwigo.transverse.ImagesManagement;
import fr.mael.jiwigo.transverse.enumeration.MethodsEnum;
import fr.mael.jiwigo.transverse.enumeration.PreferencesEnum;
import fr.mael.jiwigo.transverse.util.Outil;
import fr.mael.jiwigo.transverse.util.preferences.PreferencesManagement;


/**
   Copyright (c) 2010, Mael
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of jiwigo nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL Mael BE LIABLE FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   
 * Dao des images
 * @author mael
 *
 */
public class ImageDao {

	/**
	 * Logger
	 */
	public static final org.apache.commons.logging.Log LOG = org.apache.commons.logging.LogFactory.getLog(ImageDao.class);

	/**
	 * Singleton
	 */
	private static ImageDao instance;

	/**
	 * cache to avoid downloading image for each access
	 */
	private HashMap<Integer, List<Image>> cache;

	/**
	 * 
	 */
	private Integer firstCatInCache;


	/**
	 * Private singleton, to use a singleton
	 */
	private ImageDao() {
		cache = new HashMap<Integer, List<Image>>();
	}


	/**
	 * @return le singleton
	 */
	public static ImageDao getInstance() {
		if (instance == null) {
			instance = new ImageDao();
		}
		return instance;
	}


	/**
	 * Lists all images
	 * @return the list of images
	 * @throws IOException 
	 */
	public List<Image> lister(boolean rafraichir) throws IOException {
		return listerParCategory(null, rafraichir);
	}


	/**
	 * Listing of the images for a category
	 * @param categoryId the id of the category
	 * @return the list of images
	 * @throws IOException 
	 */
	public List<Image> listerParCategory(Integer categoryId, boolean rafraichir) throws IOException {
		if (rafraichir || cache.get(categoryId) == null) {
			Document doc = null;

			if (categoryId != null) {
				doc = Main.sessionManager.executerReturnDocument(MethodsEnum.LISTER_IMAGES.getLabel(), "cat_id",
						String.valueOf(categoryId));
			} else {
				doc = Main.sessionManager.executerReturnDocument(MethodsEnum.LISTER_IMAGES.getLabel());
			}
			Element element = doc.getRootElement().getChild("images");
			List<Image> images = getImagesFromElement(element);
			cache.remove(categoryId);
			cache.put(categoryId, images);
			if (firstCatInCache == null) {
				firstCatInCache = categoryId;
			}
			return images;
		} else {
			return cache.get(categoryId);
		}
	}


	/**
	 * Creation of an image<br/>
	 * Sequence : <br/>
	 * <li>
	 * <ul>sending of the thumbnail in base64, thanks to the method addchunk.</ul>
	 * <ul>sending of the image in base64, thanks to the method addchunk</ul>
	 * <ul>using of the add method to add the image to the database<ul>
	 * </li>
	 * Finally, the response of the webservice is checked
	 * 
	 * @param the image to create
	 * @return true if the creation of the image was the successful
	 * @throws Exception
	 */
	//TODO ne pas continuer si une des réponses précédentes est négative
	public boolean creer(Image image) throws Exception {
		//thumbnail converted to base64
		BASE64Encoder base64 = new BASE64Encoder();

		String thumbnailBase64 = base64.encode(Outil.getBytesFromFile(image.getThumbnail()));
		//sends the thumbnail and gets the result 
		Document reponseThumb = (Main.sessionManager.executerReturnDocument("pwg.images.addChunk", "data", thumbnailBase64,
				"type", "thumb", "position", "1", "original_sum", Outil.getMD5Checksum(image.getOriginale().getAbsolutePath())));

		//begin feature:0001827
		Double doubleChunk = Double.parseDouble(PreferencesManagement.getValue(PreferencesEnum.CHUNK_SIZE.getLabel())) * 1000 * 1024;
		int chunk = doubleChunk.intValue();
		ArrayList<File> fichiersAEnvoyer = Outil.splitFile(image.getOriginale(), chunk);
		boolean echec = false;
		for (int i = 0; i < fichiersAEnvoyer.size(); i++) {
			File fichierAEnvoyer = fichiersAEnvoyer.get(i);
			String originaleBase64 = base64.encode(Outil.getBytesFromFile(fichierAEnvoyer));
			Document reponseOriginale = (Main.sessionManager.executerReturnDocument("pwg.images.addChunk", "data",
					originaleBase64, "type", "file", "position", String.valueOf(i), "original_sum",
					Outil.getMD5Checksum(image.getOriginale().getAbsolutePath())));
			if (!Outil.checkOk(reponseOriginale)) {
				echec = true;
				break;
			}
		}
		//end

		//add the image in the database and get the result of the webservice
		Document reponseAjout = (Main.sessionManager.executerReturnDocument("pwg.images.add", "file_sum",
				Outil.getMD5Checksum(image.getOriginale().getAbsolutePath()), "thumbnail_sum",
				Outil.getMD5Checksum(image.getThumbnail().getCanonicalPath()), "position", "1", "original_sum",
				Outil.getMD5Checksum(image.getOriginale().getAbsolutePath()), "categories",
				String.valueOf(image.getIdCategory()), "name", image.getName(), "author", Main.sessionManager.getLogin(),
				"level", String.valueOf(ImagesManagement.privacyLevel)));
		LOG.debug("Response add : " + Outil.documentToString(reponseAjout));
		//	System.out.println(Main.sessionManager.executerReturnString("pwg.images.add", "file_sum", Outil
		//		.getMD5Checksum(image.getOriginale().getAbsolutePath()), "thumbnail_sum", Outil.getMD5Checksum(image
		//		.getThumbnail().getCanonicalPath()), "position", "1", "original_sum", Outil.getMD5Checksum(image
		//		.getOriginale().getAbsolutePath()), "categories", String.valueOf(image.getIdCategory()), "name", image
		//		.getName(), "author", Main.sessionManager.getLogin()));
		//	Document reponsePrivacy = null;
		//	if (Outil.checkOk(reponseAjout)) {
		//	    reponsePrivacy = Main.sessionManager.executerReturnDocument(MethodsEnum.SET_PRIVACY_LEVEL.getLabel());
		//	}
		boolean reussite = true;
		if (!Outil.checkOk(reponseThumb) || echec || !Outil.checkOk(reponseAjout)) {
			reussite = false;
		}
		suppressionFichierTemporaires();
		return reussite;

	}


	/**
	 * Add tags to an image
	 * @param imageId id of the image
	 * @param tagId ids of the tags
	 * @throws IOException
	 */
	public boolean addTags(Integer imageId, String tagId) throws IOException {
		Document doc = Main.sessionManager.executerReturnDocument(MethodsEnum.SET_INFO.getLabel(), "image_id",
				String.valueOf(imageId), "tag_ids", tagId);
		return Outil.checkOk(doc);

	}


	/**
	 * parse an element to find images
	 * @param element the element to parse
	 * @return the list of images
	 */
	private List<Image> getImagesFromElement(Element element) {
		List<Element> listElement = (List<Element>) element.getChildren("image");
		ArrayList<Image> images = new ArrayList<Image>();
		for (Element im : listElement) {
			Image myImage = new Image();
			myImage.setMiniature(im.getAttributeValue("tn_url"));
			myImage.setUrl(im.getAttributeValue("element_url"));
			myImage.setWidth(Integer.valueOf(im.getAttributeValue("width")));
			myImage.setHeight(Integer.valueOf(im.getAttributeValue("height")));
			myImage.setFile(im.getAttributeValue("file"));
			myImage.setVue(Integer.valueOf(im.getAttributeValue("hit")));
			myImage.setIdentifiant(Integer.valueOf(im.getAttributeValue("id")));
			myImage.setName(im.getChildText("name"));
			if (myImage.getName() == null) {
				myImage.setName(myImage.getFile());
			}
			images.add(myImage);

		}
		return images;
	}


	/**
	 * Search images
	 * @param searchString the string to search
	 * @return the list of images matching the string
	 * @throws IOException 
	 */
	public List<Image> search(String searchString) throws IOException {
		Document doc = Main.sessionManager.executerReturnDocument(MethodsEnum.SEARCH.getLabel(), "query", searchString);
		LOG.debug(doc);
		Element element = doc.getRootElement().getChild("images");
		return getImagesFromElement(element);

	}


	private void suppressionFichierTemporaires() {
		File file = new File(System.getProperty("java.io.tmpdir") + "/originale.jpg");
		file.delete();
		file = new File(System.getProperty("java.io.tmpdir") + "/thumb.jpg");
		file.delete();

	}

}