/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This 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 software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jbpm.graph.def;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.zip.ZipInputStream;

import org.jbpm.JbpmConfiguration;
import org.jbpm.JbpmException;
import org.jbpm.context.def.ContextDefinition;
import org.jbpm.file.def.FileDefinition;
import org.jbpm.graph.exe.ProcessInstance;
import org.jbpm.graph.node.ProcessFactory;
import org.jbpm.graph.node.StartState;
import org.jbpm.jpdl.par.ProcessArchive;
import org.jbpm.jpdl.xml.JpdlXmlReader;
import org.jbpm.module.def.ModuleDefinition;
import org.jbpm.taskmgmt.def.TaskMgmtDefinition;
import org.jbpm.util.ClassLoaderUtil;
import org.xml.sax.InputSource;

public class ProcessDefinition extends GraphElement implements NodeCollection {

  private static final long serialVersionUID = 1L;
  
  protected int version = -1;
  protected boolean isTerminationImplicit = false;
  protected Node startState = null;
  protected List nodes = null;
  transient Map nodesMap = null;
  protected Map actions = null;
  protected Map definitions = null;

  // event types //////////////////////////////////////////////////////////////

  public static final String[] supportedEventTypes = new String[]{
    Event.EVENTTYPE_PROCESS_START,
    Event.EVENTTYPE_PROCESS_END,
    Event.EVENTTYPE_NODE_ENTER,
    Event.EVENTTYPE_NODE_LEAVE,
    Event.EVENTTYPE_TASK_CREATE,
    Event.EVENTTYPE_TASK_ASSIGN,
    Event.EVENTTYPE_TASK_START,
    Event.EVENTTYPE_TASK_END,
    Event.EVENTTYPE_TRANSITION,
    Event.EVENTTYPE_BEFORE_SIGNAL,
    Event.EVENTTYPE_AFTER_SIGNAL,
    Event.EVENTTYPE_SUPERSTATE_ENTER,
    Event.EVENTTYPE_SUPERSTATE_LEAVE,
    Event.EVENTTYPE_SUBPROCESS_CREATED,
    Event.EVENTTYPE_SUBPROCESS_END,
    Event.EVENTTYPE_TIMER
  };
  public String[] getSupportedEventTypes() {
    return supportedEventTypes;
  }

  // constructors /////////////////////////////////////////////////////////////

  public ProcessDefinition() {
    this.processDefinition = this;
  }

  public static ProcessDefinition createNewProcessDefinition() {
    ProcessDefinition processDefinition = new ProcessDefinition();
    
    // now add all the default modules that are configured in the file jbpm.default.modules
    String resource = JbpmConfiguration.Configs.getString("resource.default.modules");
    Properties defaultModulesProperties = ClassLoaderUtil.getProperties(resource);
    Iterator iter = defaultModulesProperties.keySet().iterator();
    while (iter.hasNext()) {
      String moduleClassName = (String) iter.next();
      try {
        ModuleDefinition moduleDefinition = (ModuleDefinition) ClassLoaderUtil.loadClass(moduleClassName).newInstance();
        processDefinition.addDefinition(moduleDefinition);
        
      } catch (Exception e) {
        e.printStackTrace();
        throw new JbpmException("couldn't instantiate default module '"+moduleClassName+"'", e);
      }
    }
    return processDefinition;
  }

  public ProcessDefinition(String name) {
    this.processDefinition = this;
    this.name = name;
  }

  public ProcessDefinition(String[] nodes, String[] transitions) {
    this.processDefinition = this;
    ProcessFactory.addNodesAndTransitions(this, nodes, transitions);
  }

  public ProcessInstance createProcessInstance() {
    return new ProcessInstance(this);
  }

  public ProcessInstance createProcessInstance(Map variables) {
    return new ProcessInstance(this, variables, null);
  }

  public ProcessInstance createProcessInstance(Map variables, String businessKey) {
    return new ProcessInstance(this, variables, businessKey);
  }

  public void setProcessDefinition(ProcessDefinition processDefinition) {
    if (! this.equals(processDefinition)) {
      throw new JbpmException("can't set the process-definition-property of a process defition to something else then a self-reference");
    }
  }

  // parsing //////////////////////////////////////////////////////////////////
  
  /**
   * parse a process definition from an xml string.
   * @throws org.jbpm.jpdl.JpdlException if parsing reported an error.
   */
  public static ProcessDefinition parseXmlString(String xml) {
    StringReader stringReader = new StringReader(xml);
    JpdlXmlReader jpdlReader = new JpdlXmlReader(new InputSource(stringReader));
    return jpdlReader.readProcessDefinition();
  }

  /**
   * parse a process definition from an xml resource file.
   * @throws org.jbpm.jpdl.JpdlException if parsing reported an error.
   */
  public static ProcessDefinition parseXmlResource(String xmlResource) {
    InputStream resourceStream = ClassLoaderUtil.getStream(xmlResource);
    try {
      return parseXmlInputStream(resourceStream);
    }
    finally {
      if (resourceStream != null) {
        try {
          resourceStream.close();
        } 
        catch (IOException e) {
        }
      }
    }
  }

  /**
   * parse a process definition from an xml input stream.
   * @throws org.jbpm.jpdl.JpdlException if parsing reported an error.
   */
  public static ProcessDefinition parseXmlInputStream(InputStream inputStream) {
    JpdlXmlReader jpdlReader = new JpdlXmlReader(new InputSource(inputStream)); 
    return jpdlReader.readProcessDefinition();
  }

  /**
   * parse a process definition from an xml reader.
   * @throws org.jbpm.jpdl.JpdlException if parsing reported an error.
   */
  public static ProcessDefinition parseXmlReader(Reader reader) {
    JpdlXmlReader jpdlReader = new JpdlXmlReader(new InputSource(reader));
    return jpdlReader.readProcessDefinition();
  }

  /**
   * parse a process definition from a process archive zip-stream.
   * @throws org.jbpm.jpdl.JpdlException if parsing reported an error.
   */
  public static ProcessDefinition parseParZipInputStream(ZipInputStream zipInputStream) {
    try {
      return new ProcessArchive(zipInputStream).parseProcessDefinition();
    } catch (IOException e) {
      throw new JbpmException("couldn't parse process zip file zipInputStream", e);
    }
  }

  /**
   * parse a process definition from a process archive resource.
   * @throws org.jbpm.jpdl.JpdlException if parsing reported an error.
   */
  public static ProcessDefinition parseParResource(String parResource) {
    return parseParZipInputStream(new ZipInputStream(ClassLoaderUtil.getStream(parResource)));
  }

  // nodes ////////////////////////////////////////////////////////////////////

  // javadoc description in NodeCollection
  public List getNodes() {
    return nodes;
  }

  // javadoc description in NodeCollection
  public Map getNodesMap() {
    if (nodesMap==null) {
      nodesMap = new HashMap();
      if (nodes!=null) {
        Iterator iter = nodes.iterator();
        while (iter.hasNext()) {
          Node node = (Node) iter.next();
          nodesMap.put(node.getName(),node);
        }
      }
    }
    return nodesMap;
  }

  // javadoc description in NodeCollection
  public Node getNode(String name) {
    if (nodes==null) return null;
    return (Node) getNodesMap().get(name);
  }

  // javadoc description in NodeCollection
  public boolean hasNode(String name) {
    if (nodes==null) return false;
    return getNodesMap().containsKey(name);
  }

  // javadoc description in NodeCollection