/*
 * 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 java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.jbpm.process.core.Context;
import org.jbpm.process.core.ContextContainer;
import org.jbpm.process.core.context.AbstractContext;
import org.jbpm.process.core.impl.ContextContainerImpl;
import org.kie.api.definition.process.Connection;

/**
 * Default implementation of a RuleSet node.
 * 
 */
public class RuleSetNode extends StateBasedNode implements ContextContainer {

    private static final long serialVersionUID = 510l;
    
    public static final String DRL_LANG = "http://www.jboss.org/drools/rule";
    public static final String DMN_LANG = "http://www.jboss.org/drools/dmn";

    private String language = DRL_LANG;

    // NOTE: ContetxInstances are not persisted as current functionality (exception scope) does not require it
    private ContextContainer contextContainer = new ContextContainerImpl();
    
    // drl related properties
    private String ruleFlowGroup;
    
    // dmn related properties
    private String namespace;
    private String model;
    private String decision;
    
    private List<DataAssociation> inMapping = new LinkedList<DataAssociation>();
    private List<DataAssociation> outMapping = new LinkedList<DataAssociation>();
    
    private Map<String, Object> parameters = new HashMap<String, Object>();

    public void setRuleFlowGroup(final String ruleFlowGroup) {
        this.ruleFlowGroup = ruleFlowGroup;
    }

    public String getRuleFlowGroup() {
        return this.ruleFlowGroup;
    }
    
    public String getLanguage() {
        return language;
    }
    
    public void setLanguage(String language) {
        this.language = language;
    }
    
    public String getNamespace() {
        return namespace;
    }
    
    public void setNamespace(String namespace) {
        this.namespace = namespace;
    }
    
    public String getModel() {
        return model;
    }
    
    public void setModel(String model) {
        this.model = model;
    }
    
    public String getDecision() {
        return decision;
    }
    
    public void setDecision(String decision) {
        this.decision = decision;
    }

    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!");
        }
        if (getFrom() != null && !"true".equals(System.getProperty("jbpm.enable.multi.con"))) {
        	throw new IllegalArgumentException(
                    "This type of node [" + connection.getTo().getMetaData().get("UniqueId") + ", " + connection.getTo().getName() 
                    + "] cannot have more than one incoming connection!");
        }
    }

    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 && !"true".equals(System.getProperty("jbpm.enable.multi.con"))) {
        	throw new IllegalArgumentException(
                    "This type of node [" + connection.getFrom().getMetaData().get("UniqueId") + ", " + connection.getFrom().getName() 
                    + "] cannot have more than one outgoing connection!");
        }
    }
    
    public void addInMapping(String parameterName, String variableName) {
        inMapping.add(new DataAssociation(variableName, parameterName, null, null));
    }

    public void setInMappings(Map<String, String> inMapping) {
        this.inMapping = new LinkedList<DataAssociation>();
        for(Map.Entry<String, String> entry : inMapping.entrySet()) {
            addInMapping(entry.getKey(), entry.getValue());
        }
    }

    public String getInMapping(String parameterName) {
        return getInMappings().get(parameterName);
    }
    
    public Map<String, String> getInMappings() {
        Map<String,String> in = new HashMap<String, String>(); 
        for(DataAssociation a : inMapping) {
            if(a.getSources().size() ==1 && (a.getAssignments() == null || a.getAssignments().size()==0) && a.getTransformation() == null) {
                in.put(a.getTarget(), a.getSources().get(0));
            }
        }
        return in;
    }

    public void addInAssociation(DataAssociation dataAssociation) {
        inMapping.add(dataAssociation);
    }

    public List<DataAssociation> getInAssociations() {
        return Collections.unmodifiableList(inMapping);
    }
    
    public void addOutMapping(String parameterName, String variableName) {
        outMapping.add(new DataAssociation(parameterName, variableName, null, null));
    }

    public void setOutMappings(Map<String, String> outMapping) {
        this.outMapping = new LinkedList<DataAssociation>();
        for(Map.Entry<String, String> entry : outMapping.entrySet()) {
            addOutMapping(entry.getKey(), entry.getValue());
        }
    }

    public String getOutMapping(String parameterName) {
        return getOutMappings().get(parameterName);
    }
    
    public Map<String, String> getOutMappings() {
        Map<String,String> out = new HashMap<String, String>(); 
        for(DataAssociation a : outMapping) {
            if(a.getSources().size() ==1 && (a.getAssignments() == null || a.getAssignments().size()==0) && a.getTransformation() == null) {
                out.put(a.getSources().get(0), a.getTarget());
            }
        }
        return out;
    }
    
    public void addOutAssociation(DataAssociation dataAssociation) {
        outMapping.add(dataAssociation);
    }

    public List<DataAssociation> getOutAssociations() {
        return Collections.unmodifiableList(outMapping);
    }

    public Map<String, Object> getParameters() {
        return Collections.unmodifiableMap(parameters);
    }

    public void setParameters(Map<String, Object> parameters) {
        this.parameters = parameters;
    }
    
    public void setParameter(String param, Object value) {
        this.parameters.put(param, value);
    }
    
    public Object getParameter(String param) {
        return this.parameters.get(param);
    }
    
    public Object removeParameter(String param) {
        return this.parameters.remove(param);
    }
    
    public boolean isDMN() {
        return DMN_LANG.equals(language);
    }

    public List<Context> getContexts(String contextType) {
        return contextContainer.getContexts(contextType);
    }

    public void addContext(Context context) {
        ((AbstractContext) context).setContextContainer(this);
        contextContainer.addContext(context);
    }

    public Context getContext(String contextType, long id) {
        return contextContainer.getContext(contextType, id);
    }

    public void setDefaultContext(Context context) {
        ((AbstractContext) context).setContextContainer(this);
        contextContainer.setDefaultContext(context);
    }

    public Context getDefaultContext(String contextType) {
        return contextContainer.getDefaultContext(contextType);
    }

    @Override
    public Context getContext(String contextId) {
        Context context = getDefaultContext(contextId);
        if (context != null) {
            return context;
        }
        return super.getContext(contextId);
    }
}
