/**************************************************************************
 * AssignItemToSlot
 *
 * $Workfile$
 * $Revision: 1.8 $
 * $Date: 2004/10/21 08:02:19 $
 *
 * Copyright (C) 2001 CERN - European Organization for Nuclear Research
 * All rights reserved.
 **************************************************************************/

package com.c2kernel.lifecycle.instance.predefined;


import java.util.Arrays;

import com.c2kernel.collection.Collection;
import com.c2kernel.collection.CollectionMember;
import com.c2kernel.collection.MembershipException;
import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.lookup.AgentPath;
import com.c2kernel.lookup.ItemPath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.ClusterStorageException;
import com.c2kernel.process.Gateway;
import com.c2kernel.utils.Logger;

/**************************************************************************
 *
 * @author $Author: abranson $ $Date: 2004/10/21 08:02:19 $
 * @version $Revision: 1.8 $
 **************************************************************************/
public class RemoveSlotFromCollection extends PredefinedStep
{
    /**************************************************************************
    * Constructor for Castor
    **************************************************************************/
    public RemoveSlotFromCollection()
    {
        super();
    }


    /**
     * Params:
     * 0 - collection name
     * 1 - slot number OR if null:
     * 2 - target entity key
     */
    @Override
	protected String runActivityLogic(AgentPath agent, ItemPath item,
			int transitionID, String requestData) throws InvalidDataException {

        String collName;
        int slotNo = -1;
        ItemPath currentChild = null;
        Collection<? extends CollectionMember> coll;

        // extract parameters
        String[] params = getDataList(requestData);
        if (Logger.doLog(3)) Logger.msg(3, "RemoveSlotFromCollection: called by "+agent+" on "+item+" with parameters "+Arrays.toString(params));

        try {
            collName = params[0];
            if (params.length>1 && params[1].length()>0) slotNo = Integer.parseInt(params[1]);
            if (params.length>2 && params[2].length()>0) currentChild = new ItemPath(params[2]);
        } catch (Exception e) {
            throw new InvalidDataException("RemoveSlotFromCollection: Invalid parameters "+Arrays.toString(params), "");
        }
        
        if (slotNo == -1 && currentChild == null)
        	throw new InvalidDataException("RemoveSlotFromCollection: Must give either slot number or entity key", "");

        // load collection
        try {
			coll = (Collection<? extends CollectionMember>)Gateway.getStorage().get(item, ClusterStorage.COLLECTION+"/"+collName, null);
		} catch (ObjectNotFoundException ex) {
			throw new InvalidDataException("RemoveSlotFromCollection: Collection '"+collName+"' not found in this Item", "");
		} catch (ClusterStorageException ex) {
			Logger.error(ex);
			throw new InvalidDataException("RemoveSlotFromCollection: Error loading collection '\"+collName+\"': "+ex.getMessage(), "");
		}

        // check the slot is there if it's given by id
        CollectionMember slot = null;
        if (slotNo > -1) {
			try {
				slot = coll.getMember(slotNo);
			} catch (ObjectNotFoundException e) {
				throw new InvalidDataException("RemoveSlotFromCollection: Slot "+slotNo+" not found in this collection", "");
			}
        }

        // if both parameters are supplied, check the given item is actually in that slot
        if (slot != null && currentChild != null && !slot.getItemPath().equals(currentChild)) {
        		throw new InvalidDataException("RemoveSlotFromCollection: Item "+currentChild+" was not in slot "+slotNo, "");
        }

        if (slotNo == -1) { // find slot from entity key
        	for (CollectionMember member : coll.getMembers().list) {
        		if (member.getItemPath().equals(currentChild)) {
        			slotNo = member.getID();
        			break;
        		}
            }
        }
        if (slotNo == -1) {
            throw new InvalidDataException("No match", "");
        }
        
        // Remove the slot
        try {
			coll.removeMember(slotNo);
		} catch (MembershipException e) {
			throw new InvalidDataException(e.getMessage(), "");
		}

        // Store the collection
		try {
            Gateway.getStorage().put(item, coll, null);
        } catch (ClusterStorageException e) {
            Logger.error(e);
            throw new InvalidDataException("Error storing collection", "");
        }
		
        return requestData;
        
    }
}