/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ode.dao.jpa;

import org.apache.ode.bpel.dao.ScopeDAO;
import org.apache.ode.bpel.dao.XmlDataDAO;
import org.apache.ode.utils.DOMUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;

import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Transient;
import java.util.ArrayList;
import java.util.Collection;

/**
 * @author Matthieu Riou <mriou at apache dot org>
 */
@Entity
@Table(name="ODE_XML_DATA")
@NamedQueries({
    @NamedQuery(name=XmlDataDAOImpl.SELECT_XMLDATA_IDS_BY_PROCESS, query="select distinct x._id from XmlDataDAOImpl as x where x._scope._processInstance._process = :process"),
    @NamedQuery(name=XmlDataDAOImpl.SELECT_XMLDATA_IDS_BY_INSTANCE, query="select distinct x._id from XmlDataDAOImpl as x where x._scope._processInstance = :instance"),
    @NamedQuery(name=XmlDataDAOImpl.DELETE_XMLDATA_BY_SCOPE_IDS, query="delete from XmlDataDAOImpl as x where x._scopeId in(:scopeIds)")
})
public class XmlDataDAOImpl implements XmlDataDAO {
    public final static String SELECT_XMLDATA_IDS_BY_PROCESS = "SELECT_XMLDATA_IDS_BY_PROCESS";
    public final static String SELECT_XMLDATA_IDS_BY_INSTANCE = "SELECT_XMLDATA_IDS_BY_INSTANCE";
    public final static String DELETE_XMLDATA_BY_SCOPE_IDS = "DELETE_XMLDATA_BY_SCOPE_IDS";

    @Id @Column(name="XML_DATA_ID")
    @GeneratedValue(strategy=GenerationType.AUTO)
    @SuppressWarnings("unused")
    private Long _id;
    @Lob @Column(name="DATA")
    private String _data;
    @Transient
    private Node _node;
    @Basic @Column(name="IS_SIMPLE_TYPE")
    private boolean _isSimpleType;
    @Basic @Column(name="NAME")
    private String _name;

    @OneToMany(targetEntity=XmlDataProperty.class,mappedBy="_xmlData",fetch=FetchType.LAZY,cascade={CascadeType.ALL})
    private Collection<XmlDataProperty> _props = new ArrayList<XmlDataProperty>();

    @SuppressWarnings("unused")
    @Basic @Column(name="SCOPE_ID", nullable=true, insertable=false, updatable=false)
    private Long _scopeId;
    @ManyToOne(fetch=FetchType.EAGER,cascade={CascadeType.PERSIST}) @Column(name="SCOPE_ID")
    private ScopeDAOImpl _scope;

    public XmlDataDAOImpl() {}
    public XmlDataDAOImpl(ScopeDAOImpl scope, String name){
        _scope = scope;
        _name = name;
    }

    public Node get() {
        if ( _node == null && _data != null ) {
           if(_isSimpleType){
                Document d = DOMUtils.newDocument();
                // we create a dummy wrapper element
                // prevents some apps from complaining
                // when text node is not actual child of document
                Element e = d.createElement("text-node-wrapper");
                Text tnode = d.createTextNode(_data);
                d.appendChild(e);
                e.appendChild(tnode);
                _node = tnode;
           }else{
              try{
                  _node = DOMUtils.stringToDOM(_data);
              }catch(Exception e){
                  throw new RuntimeException(e);
              }
           }
        }

        return _node;
    }

    public String getName() {
        return _name;
    }

    public String getProperty(String propertyName) {
        for (XmlDataProperty prop : _props) {
            if (prop.getPropertyKey().equals(propertyName)) return prop.getPropertyValue();
        }
        return null;
    }

    private XmlDataProperty getPropertyObject(String propertyName) {
        for (XmlDataProperty prop : _props) {
            if (prop.getPropertyKey().equals(propertyName)) return prop;
        }
        return null;
    }
    
    

    public Collection<XmlDataProperty> getProps() {
		return _props;
	}
	public void setProps(Collection<XmlDataProperty> _props) {
		this._props = _props;
	}
	
	
	public ScopeDAO getScopeDAO() {
        return _scope;
    }

    public boolean isNull() {
        return _data == null;
    }

    public void remove() {

    }

    public void set(Node val) {
        _node = val;
        if ( val instanceof Element ) {
            _isSimpleType = false;
            _data = DOMUtils.domToString(val);
        } else if (_node != null) {
            _isSimpleType = true;
            _data = _node.getNodeValue();
        }
    }

    public void setProperty(String pname, String pvalue) {
        XmlDataProperty prop = getPropertyObject(pname);
        if (prop == null) {
            _props.add(new XmlDataProperty(pname, pvalue, this));
        } else {
            prop.setPropertyValue(pvalue);
        }
    }
    
    
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((_id == null) ? 0 : _id.hashCode());
		return result;
	}
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		XmlDataDAOImpl other = (XmlDataDAOImpl) obj;
		if (_id == null) {
			if (other._id != null)
				return false;
		} else if (!_id.equals(other._id))
			return false;
		return true;
	}
    
    

}
