/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.maven.plugin.coreit;

import java.util.List;

import org.apache.maven.artifact.DependencyResolutionRequiredException;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.plugins.annotations.ResolutionScope;
import org.apache.maven.project.MavenProject;

/**
 * Combines dependency resolution with aggregation. The path parameters of this mojo support the token
 * <code>&#64;artifactId&#64;</code> to dynamically adjust the output file for each project in the reactor whose
 * dependencies are dumped.
 *
 * @author Benjamin Bentmann
 */
@Mojo(name = "aggregate-test", requiresDependencyResolution = ResolutionScope.TEST, aggregator = true)
public class AggregateTestMojo extends AbstractDependencyMojo {

    /**
     * The path to the output file for the project artifacts, relative to the project base directory. Each line of this
     * UTF-8 encoded file specifies an artifact identifier. If not specified, the artifact list will not be written to
     * disk. Unlike the test artifacts, the collection of project artifacts additionally contains those artifacts that
     * do not contribute to the class path.
     */
    @Parameter(property = "depres.projectArtifacts")
    private String projectArtifacts;

    /**
     * The path to the output file for the test class path, relative to the project base directory. Each line of
     * this UTF-8 encoded file specifies the absolute path to a class path element. If not specified, the class path
     * will not be written to disk.
     */
    @Parameter(property = "depres.testClassPath")
    private String testClassPath;

    /**
     * The path to the properties file for the checksums of the test class path elements, relative to the project base
     * directory. The (trimmed) path to a JAR is used as the property key, the property value is the SHA-1 hash of the
     * JAR. If not specified, the class path checksums will not be calculated.
     */
    @Parameter(property = "depres.testClassPathChecksums")
    private String testClassPathChecksums;

    /**
     * The Maven projects in the reactor.
     */
    @Parameter(defaultValue = "${reactorProjects}", readonly = true)
    private List<MavenProject> reactorProjects;

    /**
     * Runs this mojo.
     *
     * @throws MojoExecutionException If the output file could not be created or any dependency could not be resolved.
     */
    public void execute() throws MojoExecutionException {
        try {
            for (MavenProject project : reactorProjects) {
                writeArtifacts(filter(projectArtifacts, project), project.getArtifacts());
                writeClassPath(filter(testClassPath, project), project.getTestClasspathElements());
                writeClassPathChecksums(filter(testClassPathChecksums, project), project.getTestClasspathElements());
            }
        } catch (DependencyResolutionRequiredException e) {
            throw new MojoExecutionException("Failed to resolve dependencies", e);
        }
    }

    private String filter(String filename, MavenProject project) {
        String result = filename;

        if (filename != null) {
            result = result.replaceAll("@artifactId@", project.getArtifactId());
        }

        return result;
    }
}
