/*
 * Copyright (c) 2020. 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.
 */

/*
 * 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.mvel;

import java.util.HashMap;
import java.util.Map;

import org.drools.compiler.lang.ExpressionRewriter;
import org.drools.compiler.lang.MVELDumper;
import org.drools.compiler.lang.descr.PackageDescr;
import org.mvel2.integration.impl.MapVariableResolverFactory;
import org.mvel2.optimizers.OptimizerFactory;
import org.mvel2.templates.SimpleTemplateRegistry;
import org.mvel2.templates.TemplateCompiler;
import org.mvel2.templates.TemplateRegistry;
import org.mvel2.templates.TemplateRuntime;
import org.mvel2.templates.res.Node;

/**
 * Dumps a PackageDescr into a DRL String
 */
public class DrlDumper  {

    protected final TemplateRegistry REPORT_REGISTRY = new SimpleTemplateRegistry();

    protected ExpressionRewriter mvel = new MVELDumper();

    static {
        OptimizerFactory.setDefaultOptimizer( OptimizerFactory.SAFE_REFLECTIVE );
    }

    public DrlDumper() {
        REPORT_REGISTRY.addNamedTemplate( "drl",
                                          TemplateCompiler.compileTemplate( DrlDumper.class.getResourceAsStream( "drl.mvel" ),
                                                                            (Map<String, Class< ? extends Node>>) null ) );

        /**
         * Process these templates
         */
        TemplateRuntime.execute( REPORT_REGISTRY.getNamedTemplate( "drl" ),
                                 null,
                                 REPORT_REGISTRY );
    }

    public String dump( final PackageDescr pkg ) {
        Map<String, Object> context = new HashMap<String, Object>();
        context.put( "pkg",
                     pkg );
        context.put( "mvel",
                     mvel );

        return (String) TemplateRuntime.execute( REPORT_REGISTRY.getNamedTemplate( "drl" ),
                                                 null,
                                                 new MapVariableResolverFactory( context ),
                                                 REPORT_REGISTRY );
    }

}

@@ -1307,24 +1307,73 @@
 MVELDumper;%0A
+import org.drools.compiler.lang.descr.BaseDescr;%0A
 import org.d
@@ -3175,10 +3175,565 @@
 %0A    %7D%0A%0A
+    public String dump( final BaseDescr pattern ) %7B%0A        Map%3CString, Object%3E context = new HashMap%3CString, Object%3E();%0A        context.put( %22base%22,%0A                     pattern );%0A        context.put( %22mvel%22,%0A                     mvel );%0A%0A        return (String) TemplateRuntime.execute( REPORT_REGISTRY.getNamedTemplate( %22ced%22 ),%0A                                                 null,%0A                                                 new MapVariableResolverFactory( context ),%0A                                                 REPORT_REGISTRY );%0A    %7D%0A%0A
 %7D%0A

add method to dump only LHS or single PatternDescr