/*
 * Copyright (C) 2003-2004 Red Hat Inc. All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
package com.arsdigita.cms;

import com.arsdigita.domain.DataObjectNotFoundException;
import com.arsdigita.kernel.ACSObject;
import com.arsdigita.persistence.DataCollection;
import com.arsdigita.persistence.DataObject;
import com.arsdigita.persistence.Filter;
import com.arsdigita.persistence.OID;
import com.arsdigita.persistence.SessionManager;
import com.arsdigita.versioning.VersionedACSObject;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

/**
 * <p>
 * An {@link com.arsdigita.cms.Asset asset} representing a reusable image.</p>
 *
 * @see com.arsdigita.cms.ImageAsset
 *
 * @author Scott Seago (sseago@redhat.com)
 * @author Stanislav Freidin
 *
 * @version $Id: ReusableImageAsset.java 2218 2011-06-22 23:55:36Z pboy $
 */
public class ReusableImageAsset extends ImageAsset {

    private static final Logger s_log
            = Logger.getLogger(ReusableImageAsset.class);
    public static final String BASE_DATA_OBJECT_TYPE
            = "com.arsdigita.cms.ReusableImageAsset";

    private static ArrayList<ImageInUseChecker> imageInUseCheckerList = new ArrayList<ImageInUseChecker>();

    /**
     * Default constructor. This creates a new image asset.
     */
    public ReusableImageAsset() {
        super(BASE_DATA_OBJECT_TYPE);
    }

    /**
     * Constructor. The contained <code>DataObject</code> is retrieved from the
     * persistent storage mechanism with an <code>OID</code> specified by
     * <i>oid</i>.
     *
     * @param oid The <code>OID</code> for the retrieved
     * <code>DataObject</code>.
     */
    public ReusableImageAsset(OID oid) throws DataObjectNotFoundException {
        super(oid);
    }

    /**
     * Constructor. The contained <code>DataObject</code> is retrieved from the
     * persistent storage mechanism with an <code>OID</code> specified by
     * <i>id</i> and <code>ReusableImageAsset.BASE_DATA_OBJECT_TYPE</code>.
     *
     * @param id The <code>id</code> for the retrieved <code>DataObject</code>.
     *
     */
    public ReusableImageAsset(BigDecimal id) throws DataObjectNotFoundException {
        this(new OID(BASE_DATA_OBJECT_TYPE, id));
    }

    public ReusableImageAsset(DataObject obj) {
        super(obj);
    }

    public ReusableImageAsset(String type) {
        super(type);
    }

    /**
     * @return the base PDL object type for this item. Child classes should
     * override this method to return the correct value
     */
    @Override
    public String getBaseDataObjectType() {
        return BASE_DATA_OBJECT_TYPE;
    }

    /**
     * Retrieve all images in the database. Expensive operation.
     *
     * @return a collection of ReusableImageAssets
     */
    public static ImageAssetCollection getAllReusableImages() {
        DataCollection da = SessionManager.getSession().retrieve(
                BASE_DATA_OBJECT_TYPE);
        //da.addEqualsFilter(VersionedACSObject.IS_DELETED, new Integer(0));
        //da.addEqualsFilter(ACSObject.OBJECT_TYPE, BASE_DATA_OBJECT_TYPE);
        da.addFilter(String.format("%s = '%s'",
                VersionedACSObject.IS_DELETED,
                "0"));
        da.addFilter(String.format("%s = '%s'",
                ACSObject.OBJECT_TYPE,
                BASE_DATA_OBJECT_TYPE));
        return new ImageAssetCollection(da);
    }

    /**
     * Find all images whose name matches the specified keyword
     *
     * @param keyword a String keyword
     * @param context the context for the retrieved items. Should be
     * {@link ContentItem#DRAFT} or {@link ContentItem#LIVE}
     * @return a collection of images whose name matches the keyword
     */
    public static ImageAssetCollection getReusableImagesByKeyword(
            String keyword, String context) {
        ImageAssetCollection c = getAllReusableImages();
        c.addOrder(Asset.NAME);
        Filter f;
        if (!(keyword == null || keyword.length() < 1)) {
            f = c.addFilter("lower(name) like lower(\'%\' || :keyword || \'%\')");
            f.set("keyword", keyword);
        }
        f = c.addFilter("version = :version");
        f.set("version", context);
        return c;
    }

    /**
     * Find all images whose name matches the specified keyword
     *
     * @param keyword a String keyword
     * @return a collection of images whose name matches the keyword
     */
    public static ImageAssetCollection getReusableImagesByKeyword(String keyword) {
        return getReusableImagesByKeyword(keyword, ContentItem.DRAFT);
    }

    public static void registerImageInUseChecker(ImageInUseChecker checker) {
        //check if the checker is already registered
        if (imageInUseCheckerList.contains(checker)) {
            //do nothing
            return;
        }
        //register checker
        imageInUseCheckerList.add(checker);
    }

//    
//    public ImageInUseChecker getChecker(ImageInUseChecker checker) {
//        for (Iterator it = imageInUseCheckerList.iterator(); it.hasNext();) {
//            Object check = it.next();
//            if (check.equals(checker)) {
//                return (ImageInUseChecker)check;
//            }
//        }
//        return checker;
//    }
    /*
     *checks if the ReusableImageAsset is in use
     */
    public boolean isInUse() {
        boolean isInUse = false;
        //get Checker:
        //TODO: getting the right checker
        for (ImageInUseChecker checker : imageInUseCheckerList) {
            if (checker != null) {
                if (checker.isImageInUse(this)) {
                    isInUse = true;
                }
            }
        }
        return isInUse;
    }

    public List<ContentItem> getImageUsers() {
        List<ContentItem> list = new ArrayList();
        for (ImageInUseChecker checker : imageInUseCheckerList) {

            if (checker != null) {
                list = checker.getImageUsers(this);
            }
        }
        return list;
    }

}