package com.c2kernel.lifecycle.instance;
import java.util.ArrayList;
import java.util.Vector;

import com.c2kernel.common.AccessRightsException;
import com.c2kernel.common.GTimeStamp;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.InvalidTransitionException;
import com.c2kernel.common.ObjectAlreadyExistsException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.agent.Job;
import com.c2kernel.events.Event;
import com.c2kernel.events.History;
import com.c2kernel.graph.model.Vertex;
import com.c2kernel.lifecycle.WfCastorHashMap;
import com.c2kernel.lifecycle.instance.stateMachine.StateMachine;
import com.c2kernel.lifecycle.instance.stateMachine.States;
import com.c2kernel.lifecycle.instance.stateMachine.Transitions;
import com.c2kernel.lookup.AgentPath;
import com.c2kernel.lookup.EntityPath;
import com.c2kernel.lookup.InvalidEntityPathException;
import com.c2kernel.lookup.LDAPRoleManager;
import com.c2kernel.lookup.RolePath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.TransactionManager;
import com.c2kernel.persistency.outcome.Outcome;
import com.c2kernel.persistency.outcome.Viewpoint;
import com.c2kernel.process.Gateway;
import com.c2kernel.scripting.ScriptingEngineException;
import com.c2kernel.utils.DateUtility;
import com.c2kernel.utils.Logger;
/**
 * @version $Revision: 1.222 $ $Date: 2005/10/05 07:39:37 $
 * @author $Author: abranson $
 */
public class Activity extends WfVertex
{
	/**
	 * vector of errors (Strings) that is constructed each time verify() is launched
	 */
	protected Vector<String> mErrors;
	/** @associates a State machine engine */
	private StateMachine machine;
	/** true is avalaibe to be executed */
	public boolean active = false;
	/** used in verify() */
	private boolean loopTested;
	private GTimeStamp mStartDate;
	private GTimeStamp mActiveDate;
	private String mType;
	private EntityPath mEntityPath;
	public Activity()
	{
		super();
		setProperties(new WfCastorHashMap());
		mErrors = new Vector<String>(0, 1);
		machine = new StateMachine(this);
		mStartDate = new GTimeStamp();
		mActiveDate = new GTimeStamp();
		DateUtility.setToNow(mActiveDate);
		DateUtility.setToNow(mStartDate);
	}
	/** @return the SystemKey of the item that contains the workflow */
	public EntityPath getItemEntityPath()
	{
		if (mEntityPath == null)
			try
			{
				Integer i = (Integer) (getWf().getProperties().get("ItemSystemKey"));
				if (i == null)
					return null; // no item yet
				EntityPath entityPath = new EntityPath(i.intValue());
				mEntityPath = entityPath;
			}
			catch (InvalidEntityPathException ex)
			{
				Logger.error("InvalidEntityPathException::Activity::getItemSystemKey() " + ex.toString());
				return null;
			}
		return mEntityPath;
	}
	/** @return the StateMachine */
	public StateMachine getMachine()
	{
		return machine;
	}
	/** sets the StateMachine (Only for Serialisation) */
	public void setMachine(StateMachine sm)
	{
		machine = sm;
	}
	/** add the activity which id is idNext as next of the current one */
	void addNext(String idNext)
	{
		new Next(this, (WfVertex) getParent().search(idNext));
	}
	/**
	 * adds a New link between the current Activity and the WfVertex passed in param
	 */
	@Override
	public Next addNext(WfVertex vertex)
	{
		return new Next(this, vertex);
	}
	/** return the current State of the State machine */
	public int getCurrentState()
	{
		return machine.getCurrentState();
	}
	/** return the current State of the State machine (Used in Serialisation) */
	public int getState()
	{
		if (machine == null)
			machine = new StateMachine(this);
		return getCurrentState();
	}
	/** Sets a new State in a State machine */
	public void setState(int stat)
	{
		if (machine == null)
			machine = new StateMachine(this);
		machine.state = stat;
	}
	/** check the abiltity of the agent passed in param to act on the activity */
	//return's the agentName
	public String checkAccessRights(AgentPath agent) throws AccessRightsException
	{
		String agentID = getCurrentAgentName();
		boolean authorised = agentID.equals(agent.getAgentName());
		String actRole = getCurrentAgentRole();
		if (!authorised)
		{
			authorised = actRole == null || actRole.equals("") || actRole.equals("all");
		}
		if (!authorised)
		{
			RolePath[] roles = agent.getRoles();
			for (int i = 0; !authorised && i < roles.length; i++)
			{
				if (roles[i].getName().equalsIgnoreCase("Admin"))
					authorised = true;
				if (roles[i].getName().equalsIgnoreCase(actRole))
					authorised = true;
				if (roles[i].getName().equalsIgnoreCase("Guest"))
					throw new AccessRightsException("Guest execution forbidden");
			}
		}
		if (!authorised)
			throw new AccessRightsException("Activity::checkAccessRights() - Agent does not hold the correct role.");
		return agent.getAgentName();
	}
	/** cf Item request */
	public void request(AgentPath agent, int transitionID, String requestData) throws AccessRightsException, InvalidTransitionException, InvalidDataException, ObjectAlreadyExistsException
	{
		int state = getState();
		String agentName = checkAccessRights(agent);
		if (machine.traverse(transitionID))
		{
			setReservation(transitionID, agentName);
			sendEventStoreOutcome(transitionID, requestData, agent);
			if (transitionID == Transitions.REPEAT)
			{
				setActive(true);
				if (getIsComposite())
				{
					WfVertex v = (WfVertex) ((CompositeActivity) this).search(getPath() + "/" + ((CompositeActivity) this).getChildGraphModel().getStartVertexId());
					v.reinit(getID());
					try
					{
						runfirst(agent);
					}
					catch (ScriptingEngineException e)
					{
						Logger.error(e);
					}
				}
			}
			if ((transitionID == Transitions.COMPLETE || transitionID == Transitions.DONE) && 
					(state == States.RSTARTED || getProperties().get("Breakpoint").equals(Boolean.TRUE)))
				setActive(false);
			else if (transitionID == Transitions.START)
				start();
			else if ((transitionID == Transitions.SKIP && getActive())
				|| transitionID == Transitions.DONE
				|| transitionID == Transitions.COMPLETE
				|| transitionID == Transitions.PROCEED)
				try
				{
					runNext(agent);
				}
				catch (ScriptingEngineException e)
				{
					Logger.error(e);
				}
			// run post execution script now
			try
			{
				String postSubmitScr = (String) getProperties().get("PostExecScriptName");
				String postSubmitVer = (String) getProperties().get("PostExecScriptVersion");
				if (postSubmitScr != null && (transitionID == Transitions.COMPLETE || transitionID == Transitions.DONE))
					evaluateScript(postSubmitScr, postSubmitVer);
			}
			catch (ScriptingEngineException ex)
			{
				Logger.error(ex);
			}
			//refresh all the job lists
			pushJobsToAgents();
		}
		else
			throw new InvalidTransitionException("Activity is in the wrong state.");
	}
	public void setReservation(int transitionID, String agentName)
	{
		String actAgentName = (String) getProperties().get("Agent Name");
		switch (transitionID)
		{
			// these transition reserve the activity
			case Transitions.REASSIGN :
			case Transitions.RESERVE :
			case Transitions.START :
				actAgentName = agentName;
				break;
				// these clear any current reservation
			case Transitions.COMPLETE :
			case Transitions.DONE :
			case Transitions.IGNORE :
			case Transitions.SKIP :
				actAgentName = "";
				// other transitions have no effect on the reservations
			default :
				}
		getProperties().put("Agent Name", actAgentName);
	}
	public String getTransitions()
	{
		String result = "<PossibleTransitions>";
		int i;
		for (i = 0; i < machine.possibleTransition().length; i++)
		{
			result += machine.possibleTransition()[i] + ",";
		}
		//cuts out the last comma(',') if required
		if (i > 0)
		{
			result = result.substring(0, result.length() - 1);
		}
		result += "</PossibleTransitions>";
		return result;
	}
	/** launch the verification of the activity */
	@Override
	public boolean verify()
	{
		mErrors.removeAllElements();
		int nbInEdgres = getInEdges().length;
		int nbOutEdges = getOutEdges().length;
		if (nbInEdgres == 0 && this.getID() != getParent().getChildrenGraphModel().getStartVertexId())
		{
			mErrors.add("Unreachable");
			return false;
		}
		else if (nbInEdgres > 1)
		{
			mErrors.add("Bad nb of previous");
			return false;
		}
		else if (nbOutEdges > 1)
		{
			mErrors.add("too many next");
			return false;
		}
		else if (nbOutEdges == 0)
		{
			if (!((CompositeActivity) getParent()).hasGoodNumberOfActivity())
			{
				mErrors.add("too many endpoints");
				return false;
			}
		}
//		else
//		{
//			Vertex[] outV = getOutGraphables();
//			Vertex[] anteVertices = GraphTraversal.getTraversal(getParent().getChildrenGraphModel(), this, GraphTraversal.kUp, false);
//			boolean errInLoop = false;
//			for (int i = 0; i < outV.length; i++)
//			{
//				for (int j = 0; j < anteVertices.length; j++)
//					if (!loop() && outV[i].getID() == anteVertices[j].getID())
//						errInLoop = true;
//			}
//			if (errInLoop)
//			{
//				mErrors.add("Error In Loop");
//				return false;
//			}
//		}
		return true;
	}
	/** Used in verify() */
	@Override
	public boolean loop()
	{
		boolean loop2 = false;
		if (!loopTested)
		{
			loopTested = true;
			if (getOutGraphables().length != 0)
				loop2 = ((WfVertex) getOutGraphables()[0]).loop();
		}
		loopTested = false;
		return loop2;
	}
	/** sets the next activity available if possible */
	@Override
	public void runNext(AgentPath agent) throws ScriptingEngineException
	{
		setActive(false);
		try
		{
			Vertex[] outVertices = getOutGraphables();
			Vertex[] outVertices2 = getOutGraphables();
			boolean hasNoNext = false;
			boolean out = false;
			while (!out)
				if (outVertices2.length > 0)
				{
					if (outVertices2[0] instanceof Join)
						outVertices2 = ((WfVertex) outVertices2[0]).getOutGraphables();
					else
						out = true;
				}
				else
				{
					hasNoNext = true;
					out = true;
				}
			Logger.debug(8, outVertices + " " + outVertices2);
			if (!hasNoNext)
				 ((WfVertex) outVertices[0]).run(agent);
			else
			{
				if (getParent() != null && getParent().getName().equals("domain")) // workflow
					// finished
					setActive(true);
				else
				{
					CompositeActivity parent = (CompositeActivity) getParent();
					if (parent != null)
						parent.runNext(agent);
				}
			}
		}
		catch (ScriptingEngineException s)
		{
			setActive(true);
			throw s;
		}
	}
	/** @return the only Next of the Activity */
	public Next getNext()
	{
		if (getOutEdges().length > 0)
			return (Next) getOutEdges()[0];
		else
			return null;
	}
	/** reinitialises the Activity and propagate (for Loop) */
	@Override
	public void reinit(int idLoop)
	{
		Logger.debug(7, "reinit " + getItemEntityPath().getSysKey() + " " + getPath());
		Vertex[] outVertices = getOutGraphables();
		machine.state = States.WAITING;
		if (outVertices.length > 0)
		{
			WfVertex nextAct = (WfVertex) outVertices[0];
			nextAct.reinit(idLoop);
		}
	}
	/** return the String that identifies the errors found in th activity */
	@Override
	public String getErrors()
	{
		if (mErrors.size() == 0)
			return "No error";
		return mErrors.elementAt(0);
	}
	/**
	 * called by precedent Activity runNext() for setting the activity able to be executed
	 */
	@Override
	public void run(AgentPath agent) throws ScriptingEngineException
	{
		Logger.debug(8, getPath() + " run " + getCurrentState());
		if (!getActive())
			setActive(true);

		if (getMachine().getCurrentState() == States.FINISHED)
		{
			runNext(agent);
		}
		else
		{
			DateUtility.setToNow(mActiveDate);
			pushJobsToAgents();
		}
	}
	/**
	 * sets the activity available to be executed on start of Workflow or composite activity (when it is the first one of the (sub)process
	 */
	@Override
	public void runfirst(AgentPath agent) throws ScriptingEngineException
	{
		Logger.debug(8, getPath() + " runfirst");
		run(agent);
	}
	/** @return the current ability to be executed */
	public boolean getActive()
	{
		return active;
	}
	/** sets the ability to be executed */
	public void setActive(boolean acti)
	{
		active = acti;
	}
	/** @return the Description field of properties */
	public String getDescription()
	{
		if (getProperties().containsKey("Description"))
			return (String) (getProperties().get("Description"));
		return "No description";
	}
	public String getCurrentAgentName()
	{
		return (String) getProperties().get("Agent Name");
	}
	public String getCurrentAgentRole()
	{
		return (String) getProperties().get("Agent Role");
	}
	/**
	 * @return an array of Steps that matches the querry
	 * @param agentID
	 *            Agent concerned by the query
	 * @param agentRole
	 *            Agent concerned by the query @int stateID state to test in the query, use -1 for all
	 * @param filter
	 *            if tru will be filtered by agent, else won't
	 */
	public Activity[] query(AgentPath agent, int stateID, boolean filter)
	{
		if (getCurrentState() == stateID || stateID == -1)
		{
			Activity[] steps = { this };
			if (!filter)
				return steps;
			else
			{
				try
				{
					checkAccessRights(agent);
					return steps;
				}
				catch (AccessRightsException e)
				{
					//case that agent is not allowed
					Logger.msg(7, "Activity :: AccessRightsException in " + this.getItemEntityPath() + "/" + this.getPath());
				}
			}
		}
		return new Activity[0];
	}
	/**
	 * returns the lists of jobs for the activity and children (cf com.c2kernel.entity.Job)
	 */
	public ArrayList<Job> calculateJobs(AgentPath agent, boolean recurse)
	{
		return calculateJobsBase(agent, false);
	} //
	public ArrayList<Job> calculateAllJobs(AgentPath agent, boolean recurse)
	{
		return calculateJobsBase(agent, true);
	}
	private ArrayList<Job> calculateJobsBase(AgentPath agent, boolean all)
	{
		Logger.msg(7, "calculateJobs - " + getPath());
		int[] transitions = {
		};
		ArrayList<Job> jobs = new ArrayList<Job>();
		try
		{
			String agentName = checkAccessRights(agent);
			String currentAgentName = getCurrentAgentName();
			boolean isCurrent = currentAgentName == null || currentAgentName.equals("") || agentName.equals(currentAgentName);
			if ((all || getActive()) && !getName().equals("domain"))
				transitions = machine.possibleTransition();
			Logger.msg(7, "Activity.calculateJobs() - Got " + transitions.length + " transitions.");
			for (int i = 0; i < transitions.length; i++)
			{
				Logger.msg(7, "Creating Job object for transition " + transitions[i]);
				if ((isCurrent && !(transitions[i] == Transitions.REASSIGN && agentName.equals(currentAgentName))) || (transitions[i] == Transitions.REASSIGN && !agentName.equals(currentAgentName)))
					jobs.add(new Job(getItemEntityPath().getSysKey(), getPath(), transitions[i], getCurrentState(), machine.simulate(transitions[i]), getName(), getProperties(), getType(), agentName));
			}
		}
		catch (AccessRightsException ex)
		{
            Logger.msg(6, "Agent "+  agent.getAgentName() +" is not allowed to interact with "+getItemEntityPath().getSysKey()+":"+getPath());
		} // empty joblist then
		return jobs;
	}


	/** Adds an event to the AuditTrail of the Item if any */
	private Event auditEvent(int transitionID, AgentPath agent, boolean hasOutcome, boolean isError)
	{
		EntityPath entityPath = getItemEntityPath();
		if (entityPath != null)
		{
			Event event = null;
			History hist = null;
			String viewName = hasOutcome?(String)getProperties().get("Viewpoint"):null;
			try
			{
				hist = (History) Gateway.getStorage().get(entityPath.getSysKey(), ClusterStorage.HISTORY, this);
				if (hasOutcome) {
					String schemaName = isError?"Errors":(String)getProperties().get("SchemaType");
					Integer schemaVersion = isError?0:(Integer)getProperties().get("SchemaVersion");
					event = hist.addEvent(agent.getAgentName(), getCurrentAgentRole(), transitionID, getName(), getPath(), getType(), schemaName, schemaVersion, viewName, getCurrentState());
				}
				else
					event = hist.addEvent(agent.getAgentName(), getCurrentAgentRole(), transitionID, getName(), getPath(), getType(), getCurrentState());
				Logger.msg(7, "Activity::auditEvent() - Event:" + event.getName() + " was added to the AuditTrail");
			}
			catch (Exception ex)
			{
				Logger.error("Activity::auditEvent() - Item '" + entityPath.toString() + "'!");
				Logger.error(ex);
			}
			return event;
		}
		else
			return null;
	} 
	
	/**
	  * Stores the request data as an outcome of the Item It does a great deal of storing outcomes in different configuration
	  */ //requestdata is xmlstring
	
	private String storeOutcome(int eventID, String requestData, boolean isError) throws InvalidDataException
	{
		EntityPath entityPath = getItemEntityPath();
		if (requestData == null || requestData.length() == 0)
			throw new InvalidDataException("Empty outcome", "");
		if (entityPath != null)
		{
			String schemaType; 
			int schemaVersion;
			
			if (isError) {
				schemaType="Errors";
				schemaVersion=0;
			}
			else {
				schemaType = (String) getProperties().get("SchemaType");
				if (schemaType == null || schemaType.length() == 0) return null;
				String versionString = (String) getProperties().get("SchemaVersion");
				try
				{
					schemaVersion = Integer.parseInt(versionString);
				} catch (Exception e) {
					throw new InvalidDataException("Activity.storeOutcome() - invalid schemaVersion " + versionString, "");
				}
			}
				
			Logger.msg(5, "Activity::storeOutcome() - type:" + schemaType + " version:" + schemaVersion);
			try
			{
				Outcome newOutcome = new Outcome(eventID, requestData, schemaType, schemaVersion);
				Gateway.getStorage().put(entityPath.getSysKey(), newOutcome, this);
				// update specific view if defined
				String specificView = (String) getProperties().get("Viewpoint");
				if (specificView != null && !specificView.equals(""))
				{
					Viewpoint currentView = new Viewpoint(entityPath.getSysKey(), schemaType, specificView, schemaVersion, eventID);
					Gateway.getStorage().put(entityPath.getSysKey(), currentView, this);
				} // update last view
				Viewpoint currentView = new Viewpoint(entityPath.getSysKey(), schemaType, "last", schemaVersion, eventID);
				Gateway.getStorage().put(entityPath.getSysKey(), currentView, this);
				return schemaType + "/" + schemaVersion + "/" + eventID;
			}
			catch (Exception ex)
			{
				Logger.error("ActivityBase::storeOutcome() - Item '" + entityPath.toString() + "'!");
				Logger.error(ex);
			}
			return null;
		}
		else
			return null;
	} 
	
	/** the method to be called by the requestAction() method 
	 * @throws InvalidDataException */
	public void sendEventStoreOutcome(int transitionID, String requestData, AgentPath agent) throws InvalidDataException
	{
		int eventID = -1;
		String schemaType = (String) getProperties().get("SchemaType");
		boolean hasOutcome = (transitionID == Transitions.DONE || transitionID == Transitions.COMPLETE) && (schemaType != null && schemaType.length() > 0);
		boolean hasErrorOutcome = transitionID == Transitions.SUSPEND && requestData != null && requestData.length()>0;
		Event event = auditEvent(transitionID, agent, hasOutcome, hasErrorOutcome);
		if (event != null)
			eventID = event.getID();
		if (hasOutcome || hasErrorOutcome)
			storeOutcome(eventID, requestData, hasErrorOutcome);
		EntityPath entityPath = getItemEntityPath();
		TransactionManager storage = Gateway.getStorage();
		if (entityPath != null)
		{
			storage.commit(this);
		}
	}
	
	public void pushJobsToAgents()
	{
		String agentRole = getCurrentAgentRole();
		if (agentRole == null || agentRole.length()==0) return;

		LDAPRoleManager roleMan = Gateway.getLDAPLookup().getRoleManager();
    	RolePath myRole;
        try {
            myRole = roleMan.getRolePath(agentRole);
        } catch (ObjectNotFoundException ex) { // non-existent role
    		Logger.msg(7, "Activity.pushJobsToAgents() - Activity role '"+agentRole+" not found.");
    		return;
    	}

        if (myRole.hasJobList())
        	new JobPusher(this, myRole).start();
    }


	  /**
	   * Returns the activeDate.
	   *
	   * @return GTimeStamp
	   */
	public GTimeStamp getActiveDate()
	{
		return mActiveDate;
	} /**
	   * Returns the startDate.
	   *
	   * @return GTimeStamp
	   */
	public GTimeStamp getStartDate()
	{
		return mStartDate;
	} /**
	   * Sets the activeDate.
	   *
	   * @param activeDate
	   *            The activeDate to set
	   */
	public void setActiveDate(GTimeStamp activeDate)
	{
		mActiveDate = activeDate;
	} /**
	   * Sets the startDate.
	   *
	   * @param startDate
	   *            The startDate to set
	   */
	public void setStartDate(GTimeStamp startDate)
	{
		mStartDate = startDate;
	} /**
	   * Returns the type.
	   *
	   * @return String
	   */
	public String getType()
	{
		return mType;
	} /**
	   * Sets the type.
	   *
	   * @param type
	   *            The type to set
	   */
	public void setType(String type)
	{
		mType = type;
	}
	private void start()
	{
		Logger.debug(8, getPath() + " start");
		DateUtility.setToNow(mStartDate);
	}

}