/*
 * Copyright 2015 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.
 * 
 *      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.example.api.kiefilesystem;

import org.kie.api.KieServices;
import org.kie.api.builder.KieBuilder;
import org.kie.api.builder.KieFileSystem;
import org.kie.api.builder.KieRepository;
import org.kie.api.builder.Message.Level;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;

import java.io.PrintStream;


public class KieFileSystemExample {

    public void go(PrintStream out) {
        KieServices ks = KieServices.Factory.get();
        KieRepository kr = ks.getRepository();
        KieFileSystem kfs = ks.newKieFileSystem();

        kfs.write("src/main/resources/org/kie/example5/HAL5.drl", getRule());

        KieBuilder kb = ks.newKieBuilder(kfs);

        kb.buildAll(); // kieModule is automatically deployed to KieRepository if successfully built.
        if (kb.getResults().hasMessages(Level.ERROR)) {
            throw new RuntimeException("Build Errors:\n" + kb.getResults().toString());
        }

        KieContainer kContainer = ks.newKieContainer(kr.getDefaultReleaseId());

        KieSession kSession = kContainer.newKieSession();
        kSession.setGlobal("out", out);

        kSession.insert(new Message("Dave", "Hello, HAL. Do you read me, HAL?"));
        kSession.fireAllRules();
    }

    public static void main(String[] args) {
        new KieFileSystemExample().go(System.out);
    }


    private static String getRule() {
        String s = "" +
                   "package org.drools.example.api.kiefilesystem \n\n" +
                   "import org.drools.example.api.kiefilesystem.Message \n\n" +
                   "global java.io.PrintStream out \n\n" +
                   "rule \"rule 1\" when \n" +
                   "    m : Message( ) \n" +
                   "then \n" +
                   "    out.println( m.getName() + \": \" +  m.getText() ); \n" +
                   "end \n" +
                   "rule \"rule 2\" when \n" +
                   "    Message( text == \"Hello, HAL. Do you read me, HAL?\" ) \n" +
                   "then \n" +
                   "    insert( new Message(\"HAL\", \"Dave. I read you.\" ) ); \n" +
                   "end";

        return s;
    }

}