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/*
 * #%L
 * Wikitty :: api
 * %%
 * Copyright (C) 2009 - 2011 CodeLutin, Benjamin Poussin, Chatellier Eric
 * %%
 * This program 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 3 of the 
 * License, or (at your option) any later version.
 * 
 * This program 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * .
 * #L%
 */
package org.nuiton.wikitty.entities;

import org.nuiton.wikitty.WikittyException;
import org.nuiton.wikitty.WikittyUtil;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;

/**
 *
 * @author poussin
 * @version $Revision$
 *
 * Each business object will inherit of this class.
 *
 * Last update: $Date$
 * by : $Author$
 */
public class BusinessEntityImpl implements BusinessEntity {

    /** serialVersionUID. */
    private static final long serialVersionUID = -4399752739887114180L;

    /**
     * Property change support.
     * 
     * Warning, this transient field is null after deserialization.
     */
    protected transient PropertyChangeSupport propertyChangeSupport;
    
    /**
     * Only used by meta-extension, but all extension need it, bacause
     * extension can require meta-extension, and then this attribute
     * the metaExtension operations target this extension, may be null
     */
    protected WikittyExtension extensionForMetaExtension;
    protected Wikitty wikitty;

    public BusinessEntityImpl(Wikitty wi) {
        setWikitty(wi);
    }

    public BusinessEntityImpl() {
        this(new WikittyImpl());
    }

    protected PropertyChangeSupport getPropertyChangeSupport() {
        if (propertyChangeSupport == null) {
            propertyChangeSupport = new PropertyChangeSupport(this);
        }
        return propertyChangeSupport;
    }

    @Override
    public String getWikittyId() {
        String result = getWikitty().getWikittyId();
        return result;
    }

    @Override
    public String getWikittyVersion() {
        String result = getWikitty().getWikittyVersion();
        return result;
    }

    @Override
    public void setWikittyVersion(String version) {
        getWikitty().setWikittyVersion(version);
    }

    public void setWikitty(Wikitty wikitty) {
        if(wikitty != null) {
            for (WikittyExtension ext : getStaticExtensions()) {
                if (!wikitty.getExtensions().contains(ext)){
                    wikitty.addExtension(ext);
                }
            }
        }
        this.wikitty = wikitty;
    }

    public Wikitty getWikitty() {
        return wikitty;
    }

    /**
     * this copy used introspection, you can override it in generated class
     * to optimize it
     * @param source
     */
    @Override
    public void copyFrom(BusinessEntity source) {
        try {
            WikittyUtil.copyBean(source, this);
        } catch(Exception eee) {
            throw new WikittyException(String.format(
                    "Can't copy source object %s", source), eee);
        }
    }
    
    @Override
    public Collection getExtensionNames() {
        Collection result = getWikitty().getExtensionNames();
        return result;
    }

    @Override
    public Collection getExtensionFields(String ext) {
        Collection result = getWikitty().getExtension(ext).getFieldNames();
        return result;
    }

    //@Override
    public FieldType getFieldType(String ext, String fieldName) {
        FieldType result = getWikitty().getExtension(ext).getFieldType(fieldName);
        return result;
    }

    @Override
    public Object getFieldAsObject(String ext, String fieldName) {
        Object result = getWikitty().getFieldAsObject(ext, fieldName);
        return result;
    }

    @Override
    public Object getField(String ext, String fieldName) {
        return getFieldAsObject(ext, fieldName);
    }

    @Override
    public void setField(String ext, String fieldName, Object value) {
        getWikitty().setField(ext, fieldName, value);
    }

    /**
     * Return list of all extension that this entity has by definition
     * (design time) and not extension added during execution time
     * @return static extension 
     */
    public Collection getStaticExtensions() {
        return Collections.emptyList();
    }

    @Override
    public Collection getStaticExtensionNames() {
        ArrayList result = new ArrayList();
        for (WikittyExtension ext : getStaticExtensions()) {
            result.add(ext.getName());
        }
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (!BusinessEntityImpl.class.isAssignableFrom(obj.getClass())) {
            return false;
        }
        BusinessEntityImpl w = (BusinessEntityImpl) obj;
        return getWikittyId().equals(w.getWikittyId());
    }

    @Override
    public int hashCode() {
        return getWikittyId().hashCode();
    }

    /*
    * @see org.nuiton.wikitty.BusinessEntity#addPropertyChangeListener(java.beans.PropertyChangeListener)
    */
    @Override
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        getPropertyChangeSupport().addPropertyChangeListener(listener);
    }

    /*
     * @see org.nuiton.wikitty.BusinessEntity#removePropertyChangeListener(java.beans.PropertyChangeListener)
     */
    @Override
    public void removePropertyChangeListener(PropertyChangeListener listener) {
        getPropertyChangeSupport().removePropertyChangeListener(listener);
    }

    /*
     * @see org.nuiton.wikitty.BusinessEntity#addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
     */
    @Override
    public void addPropertyChangeListener(String propertyName,
            PropertyChangeListener listener) {
        getPropertyChangeSupport().addPropertyChangeListener(propertyName, listener);
    }

    /*
     * @see org.nuiton.wikitty.BusinessEntity#removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
     */
    @Override
    public void removePropertyChangeListener(String propertyName,
            PropertyChangeListener listener) {
        getPropertyChangeSupport().removePropertyChangeListener(propertyName, listener);
    }
}