package org.jboss.qa.brms.kie.dsl;

import java.io.StringReader;

import org.junit.Test;
import org.kie.api.KieServices;
import org.kie.api.io.KieResources;
import org.kie.api.io.Resource;
import org.kie.api.io.ResourceType;
import org.kie.internal.utils.KieHelper;

/**
 * Tests DSL parsing which should try to cover the maximum input fragment.
 *
 * Please see test methods comments.
 */
public class GreedyDslTest {

    private static final String DSL_BASIC = "#/ result \n"
            + "[when]There is a number with=i:Integer()\n"
            + "[when]There is a number with value of {value}=i:Integer(intValue() == {value})\n";

    private static final String DSLR_BASIC = "package org.drools.test.dsl.basic \n"
            + "rule 'basic rule' \n"
            + "when \n" + "  There is a number with value of 10\n"
            + "then \n" + "end \n";

    // illustrates the case when ordering according to the left part of DSL rule length is not enough
    private static final String DSL_COMPLICATED = "#/ result \n"
            + "[when]There is a number where {constraints}=i:Integer(where {constraints})\n"
            + "[when]integer value=intValue()\n"
            + "[when]long value=longValue()\n"
            + "[when]where {attr:[a-zA-Z0-9()]+} is {value}={attr} == {value}\n";

    private static final String DSLR_COMPLICATED = "package org.drools.test.dsl.complicated \n"
            + "rule 'sample rule' \n"
            + "when \n" + "  There is a number where integer value is 10\n"
            + "then \n" + "end \n";

    /**
     * Tests compiling DSL with overlapping definitions.
     *
     * Works with 6.0.2.ER2, works not in 6.0.1.
     */
    @Test
    public void testBasicGreedyDsl() {
        final KieResources resources = KieServices.Factory.get().getResources();
        final Resource dslResource = resources.newReaderResource(new StringReader(DSL_BASIC));
        dslResource.setResourceType(ResourceType.DSL);
        dslResource.setSourcePath("src/main/resources/test.dsl");

        final Resource dslrResource = resources.newReaderResource(new StringReader(DSLR_BASIC));
        dslrResource.setResourceType(ResourceType.DSLR);
        dslrResource.setSourcePath("src/main/resources/test.dslr");

        new KieHelper().addResource(dslResource).addResource(dslrResource).build();
    }

    /**
     * Tests compiling DSL with overlapping definitions when the ordering according to
     * the left part of the DSL rule length is not enough.
     *
     * Works with 6.0.1, works not in 6.0.2.ER2.
     */
    @Test
    public void testComplicatedGreedyDsl() {
        final KieResources resources = KieServices.Factory.get().getResources();
        final Resource dslResource = resources.newReaderResource(new StringReader(DSL_COMPLICATED));
        dslResource.setResourceType(ResourceType.DSL);
        dslResource.setSourcePath("src/main/resources/test.dsl");

        final Resource dslrResource = resources.newReaderResource(new StringReader(DSLR_COMPLICATED));
        dslrResource.setResourceType(ResourceType.DSLR);
        dslrResource.setSourcePath("src/main/resources/test.dslr");

        new KieHelper().addResource(dslResource).addResource(dslrResource).build();
    }

}