/*
 * Copyright 2013 Cameron Beccario
 *
 * 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 net.nullschool.grains.generate.plugin;

import org.apache.maven.artifact.DependencyResolutionRequiredException;
import org.apache.maven.plugins.annotations.*;
import org.codehaus.plexus.util.xml.Xpp3Dom;

import java.nio.file.Path;
import java.util.*;

import static java.util.Arrays.asList;


/**
 * 2013-02-27<p/>
 *
 * Mojo for the "generate" goal. Holds the configuration for standard (not test) source generation.
 *
 * @author Cameron Beccario
 */
@Mojo(
    name = "generate",
    defaultPhase = LifecyclePhase.GENERATE_SOURCES,
    requiresProject = true,
    requiresDependencyResolution = ResolutionScope.TEST,
    threadSafe = true)
public class GenerateMojo extends AbstractGenerateMojo {

    /**
     * The location to save generated source files.
     */
    @Parameter(property = "targetDirectory", defaultValue = "${project.build.directory}/generated-sources/grains")
    private String targetDirectory;
    @Override public String getTargetDirectory() {
        return targetDirectory;
    }

    @Override List<String> getGeneratorClasspath() throws DependencyResolutionRequiredException {
        return getProject().getRuntimeClasspathElements();
    }

    @Override List<String> getSearchClasspath() throws DependencyResolutionRequiredException {
        return getSearchProjectDependencies() ?
            getProject().getRuntimeClasspathElements() :
            Arrays.asList(getProject().getBuild().getOutputDirectory());
    }

    @Override List<String> getCompilerIncludes() {
        // Extract the include filters from the pom, if any.
        //     <execution>
        //         <phase>generate-sources</phase>
        //         <goals><goal>compile</goal></goals>
        //         <configuration>
        //             <includes><include>com/acme/model/**</include></includes>
        //         </configuration>
        //     </execution>

        Xpp3Dom configuration = findMavenConfigurationFor("maven-compiler-plugin", "generate-sources");
        if (configuration != null) {
            return valuesOf(childrenNamed("include", childrenNamed("includes", asList(configuration))));
        }
        return Collections.emptyList();
    }

    @Override void addSourceRoot(Path path) {
        getProject().addCompileSourceRoot(path.toString());
    }
}