/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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.jbpm.workflow.core.node;

import org.jbpm.workflow.core.impl.NodeImpl;
import org.kie.api.definition.process.Connection;
import org.kie.api.definition.process.NodeType;

/**
 * Default implementation of a join.
 * 
 */
public class Join extends NodeImpl {

    public static final int TYPE_UNDEFINED     = 0;
    /**
     * The outgoing connection of a join of this type is triggered
     * when all its incoming connections have been triggered.
     */
    public static final int TYPE_AND           = 1;
    /**
     * The outgoing connection of a join of this type is triggered
     * when one of its incoming connections has been triggered.
     */
    public static final int TYPE_XOR           = 2;
    /**
     * The outgoing connection of a join of this type is triggered
     * when one of its incoming connections has been triggered. It then
     * waits until all other incoming connections have been triggered
     * before allowing 
     */
    public static final int TYPE_DISCRIMINATOR = 3;
    /**
     * The outgoing connection of a join of this type is triggered
     * when n of its incoming connections have been triggered.
     */
    public static final int TYPE_N_OF_M = 4;
    
    public static final int TYPE_OR = 5;
    
    private static final long serialVersionUID = 510l;

    private int type;
    private String n;

    public Join() {
        super(NodeType.COMPLEX_GATEWAY);
        this.type = TYPE_UNDEFINED;
    }

    public void setType(final int type) {
        this.type = type;
        this.setNodeType(fromType(type));
    }

    private static NodeType fromType(int type) {
        switch (type) {
            case TYPE_AND:
                return NodeType.PARALLEL_GATEWAY;
            case TYPE_OR:
                return NodeType.INCLUSIVE_GATEWAY;
            case TYPE_XOR:
                return NodeType.EXCLUSIVE_GATEWAY;
            default:
                return NodeType.COMPLEX_GATEWAY;
        }
    }

    public int getType() {
        return this.type;
    }
    
    public void setN(String n) {
    	this.n = n;
    }
    
    public String getN() {
    	return n;
    }

    public void validateAddIncomingConnection(final String type, final Connection connection) {
        super.validateAddIncomingConnection(type, connection);
        if (!org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE.equals(type)) {
        	throw new IllegalArgumentException(
                    "This type of node [" + connection.getTo().getMetaData().get("UniqueId") + ", " + connection.getTo().getName() 
                    + "] only accepts default incoming connection type!");
        }
    }

    public void validateAddOutgoingConnection(final String type, final Connection connection) {
        super.validateAddOutgoingConnection(type, connection);
        if (!org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE.equals(type)) {
        	throw new IllegalArgumentException(
                    "This type of node [" + connection.getFrom().getMetaData().get("UniqueId") + ", " + connection.getFrom().getName() 
                    + "] only accepts default outgoing connection type!");
        }
        if (getTo() != null) {
        	throw new IllegalArgumentException(
                    "This type of node [" + connection.getFrom().getMetaData().get("UniqueId") + ", " + connection.getFrom().getName() 
                    + "] cannot have more than one outgoing connection!");
        }
    }
    
}
