package com.c2kernel.entity.imports;


import java.util.ArrayList;

import org.custommonkey.xmlunit.Diff;
import org.custommonkey.xmlunit.XMLUnit;

import com.c2kernel.collection.CollectionArrayList;
import com.c2kernel.collection.MembershipException;
import com.c2kernel.common.CannotManageException;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectAlreadyExistsException;
import com.c2kernel.common.ObjectCannotBeUpdated;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.TraceableEntity;
import com.c2kernel.events.Event;
import com.c2kernel.events.History;
import com.c2kernel.lifecycle.CompositeActivityDef;
import com.c2kernel.lifecycle.instance.stateMachine.Transition;
import com.c2kernel.lookup.DomainPath;
import com.c2kernel.lookup.ItemPath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.ClusterStorageException;
import com.c2kernel.persistency.outcome.Viewpoint;
import com.c2kernel.process.Gateway;
import com.c2kernel.process.module.ModuleImport;
import com.c2kernel.property.Property;
import com.c2kernel.property.PropertyArrayList;
import com.c2kernel.utils.LocalObjectLoader;
import com.c2kernel.utils.Logger;

/**
 * Complete Structure for new item
 *
 * @version $Revision: 1.8 $ $Date: 2006/03/03 13:52:21 $
 */

public class ImportItem extends ModuleImport {

    public String initialPath;
    public String workflow;
    public Integer workflowVer;
    public ArrayList<Property> properties  = new ArrayList<Property>();
    public ArrayList<ImportAggregation> aggregationList = new ArrayList<ImportAggregation>();
    public ArrayList<ImportDependency> dependencyList = new ArrayList<ImportDependency>();
    public ArrayList<ImportOutcome> outcomes = new ArrayList<ImportOutcome>();
    private String ns;

    public ImportItem() {
    }

    public ImportItem(String name, String initialPath, String wf, int wfVer) {
        this();
        this.name = name;
        this.initialPath = initialPath;
        this.workflow = wf;
        this.workflowVer = wfVer;
    }

	public void setNamespace(String ns) {
		this.ns = ns;
		if (initialPath == null) initialPath = "/desc/"+ns;
	}
	
	public String getNamespace() {
		return ns;
	}

	public void create(int agentId, boolean reset) throws ObjectCannotBeUpdated, ObjectNotFoundException, CannotManageException, ObjectAlreadyExistsException {
        DomainPath domPath = new DomainPath(new DomainPath(initialPath), name);

        ItemPath entPath; TraceableEntity newItem;
        if (domPath.exists()) {
        	entPath = domPath.getEntity();
        	newItem = Gateway.getCorbaServer().getItem(entPath.getSysKey());
        } 
        else {
	        // create item
	        entPath = Gateway.getNextKeyManager().generateNextEntityKey();
	        newItem = (TraceableEntity)Gateway.getCorbaServer().createEntity(entPath);
	        Gateway.getLookup().add(entPath);
        }
        
        // set the name property
        properties.add(new Property("Name", name, true));

        // find workflow def
        CompositeActivityDef compact;
    	// default workflow version is 0 if not given
    	int usedWfVer;
    	if (workflowVer == null) usedWfVer = 0;
    	else usedWfVer = workflowVer.intValue();
        try {
        	compact = (CompositeActivityDef)LocalObjectLoader.getActDef(workflow, usedWfVer);
        } catch (ObjectNotFoundException ex) {
        	throw new CannotManageException("Could not find workflow "+workflow+"v"+usedWfVer+" for item "+domPath, "");
        } catch (InvalidDataException e) {
        	throw new CannotManageException("Workflow def "+workflow+" v"+usedWfVer+" for item "+domPath+" was not valid", "");
		}
        
        // create collections
        CollectionArrayList colls = new CollectionArrayList();
        for (ImportDependency element: dependencyList) {
            try {
            	com.c2kernel.collection.Dependency newDep = element.create();
            	colls.put(newDep);
            } catch (MembershipException ex) {
                Logger.error(ex);
                throw new CannotManageException("A specified member is not of the correct type in "+element.name, "");
            }
        }

        for (ImportAggregation element : aggregationList) {
            try {
            	com.c2kernel.collection.Aggregation newAgg = element.create();           	
            	colls.put(newAgg);
            } catch (MembershipException ex) {
	            Logger.error(ex);
	            throw new CannotManageException("A specified member is not of the correct type in "+element.name, "");
	        }
        }
 
    	// (re)initialise the new item with properties, workflow and collections
        try {
            newItem.initialise(
                    agentId,
                    Gateway.getMarshaller().marshall(new PropertyArrayList(properties)),
                    Gateway.getMarshaller().marshall(compact.instantiate()),
                    Gateway.getMarshaller().marshall(colls));
        } catch (Exception ex) {
            Logger.error("Error initialising new item "+name );
            Logger.error(ex);
            throw new CannotManageException("Problem initialising new item. See server log.", "");
        }

        // import outcomes
        XMLUnit.setIgnoreWhitespace(true);
        XMLUnit.setIgnoreComments(true);
        History hist = new History(entPath.getSysKey(), null);
        for (ImportOutcome thisOutcome : outcomes) {
            com.c2kernel.persistency.outcome.Outcome newOutcome = new com.c2kernel.persistency.outcome.Outcome(-1, thisOutcome.getData(ns), thisOutcome.schema, thisOutcome.version);
        	Viewpoint impView;
        	try {
        		impView = (Viewpoint)Gateway.getStorage().get(entPath.getSysKey(), ClusterStorage.VIEWPOINT+"/"+thisOutcome.schema+"/"+thisOutcome.viewname, null);

                Diff xmlDiff = new Diff(newOutcome.getDOM(), impView.getOutcome().getDOM());
                if (xmlDiff.identical()) {
                    Logger.msg(5, "NewItem.create() - View "+thisOutcome.schema+"/"+thisOutcome.viewname+" in "+name+" identical, no update required");
                    continue;
                }
                else {
                	Logger.msg("NewItem.create() - Difference found in view "+thisOutcome.schema+"/"+thisOutcome.viewname+" in "+name+": "+xmlDiff.toString());
                	if (!reset && !impView.getEvent().getStepPath().equals("Import")) {
                		Logger.msg("Last edit was not done by import, and reset not requested. Not overwriting.");
                		continue;
                	}
                }
        	} catch (ObjectNotFoundException ex) { 
        		Logger.msg(3, "View "+thisOutcome.schema+"/"+thisOutcome.viewname+" not found in "+name+". Creating.");
        		impView = new Viewpoint(entPath.getSysKey(), thisOutcome.schema, thisOutcome.viewname, thisOutcome.version, -1);
        	} catch (ClusterStorageException e) {
        		throw new ObjectCannotBeUpdated("Could not check data for view "+thisOutcome.schema+"/"+thisOutcome.viewname+" in "+name);
			} catch (InvalidDataException e) {
				throw new ObjectCannotBeUpdated("Could not check previous event for view "+thisOutcome.schema+"/"+thisOutcome.viewname+" in "+name);
			}
        	
        	// write new view/outcome/event
        	Transition predefDone = new Transition(0, "Done", 0, 0);
            Event newEvent = hist.addEvent("system", "Admin", "Import", "Import", "Import", thisOutcome.schema, thisOutcome.version, "PredefinedStep", 0, predefDone, thisOutcome.viewname);
            newOutcome.setID(newEvent.getID());
            impView.setEventId(newEvent.getID());
            try {
				Gateway.getStorage().put(entPath.getSysKey(), newOutcome, null);
				Gateway.getStorage().put(entPath.getSysKey(), impView, null);
			} catch (ClusterStorageException e) {
				throw new ObjectCannotBeUpdated("Could not store data for view "+thisOutcome.schema+"/"+thisOutcome.viewname+" in "+name);
			}
		}
        
        // register domain path (before collections in case of recursive collections)
        if (!domPath.exists()) {
        	domPath.setEntity(entPath);
        	Gateway.getLookup().add(domPath);
        }
    }
}