/*
 * Copyright 2010 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.drools.examples.helloworld;

import org.kie.api.KieServices;
import org.kie.api.event.rule.DebugAgendaEventListener;
import org.kie.api.event.rule.DebugRuleRuntimeEventListener;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;

import java.util.ArrayList;
import java.util.List;

/**
 * This is a sample file to launch a rule package from a rule source file.
 */
public class HelloWorldExample {

    public static final void main(final String[] args) {
        // KieServices is the factory for all KIE services 
        KieServices ks = KieServices.Factory.get();
        
        // From the kie services, a container is created from the classpath
        KieContainer kc = ks.getKieClasspathContainer();

        execute( kc );
    }

    public static void execute( KieContainer kc ) {
        // From the container, a session is created based on
        // its definition and configuration in the META-INF/kmodule.xml file
        KieSession ksession = kc.newKieSession("HelloWorldKS");

        // Once the session is created, the application can interact with it
        // In this case it is setting a global as defined in the
        // org/drools/examples/helloworld/HelloWorld.drl file
        ksession.setGlobal( "list",
                            new ArrayList<Object>() );

        // The application can also setup listeners
        ksession.addEventListener( new DebugAgendaEventListener() );
        ksession.addEventListener( new DebugRuleRuntimeEventListener() );

        // To setup a file based audit logger, uncomment the next line
        // KieRuntimeLogger logger = ks.getLoggers().newFileLogger( ksession, "./helloworld" );

        // To setup a ThreadedFileLogger, so that the audit view reflects events whilst debugging,
        // uncomment the next line
        // KieRuntimeLogger logger = ks.getLoggers().newThreadedFileLogger( ksession, "./helloworld", 1000 );

        // The application can insert facts into the session
        final Message message = new Message();
        message.setMessage( "Hello World" );
        message.setStatus( Message.HELLO );
        ksession.insert( message );

        // and fire the rules
        ksession.fireAllRules();

        // Remove comment if using logging
        // logger.close();

        // and then dispose the session
        ksession.dispose();
    }

    public static class Message {
        public static final int HELLO   = 0;
        public static final int GOODBYE = 1;

        private String          message;

        private int             status;

        public Message() {

        }

        public String getMessage() {
            return this.message;
        }

        public void setMessage(final String message) {
            this.message = message;
        }

        public int getStatus() {
            return this.status;
        }

        public void setStatus(final int status) {
            this.status = status;
        }

        public static Message doSomething(Message message) {
            return message;
        }

        public boolean isSomething(String msg,
                                   List<Object> list) {
            list.add( this );
            return this.message.equals( msg );
        }
    }

}
