/*
 * 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.resolver.examples.maven;

import javax.inject.Inject;

import java.util.List;

import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.DefaultArtifact;
import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.resolution.ArtifactRequest;
import org.eclipse.aether.resolution.ArtifactResolutionException;
import org.eclipse.aether.resolution.ArtifactResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Resolves a single artifact (not including its transitive dependencies).
 */
@Mojo(name = "resolve-artifact", threadSafe = true)
public class ResolveArtifactMojo extends AbstractMojo {
    private static final Logger LOGGER = LoggerFactory.getLogger(ResolveArtifactMojo.class);

    /**
     * The current repository/network configuration of Maven.
     */
    @Parameter(defaultValue = "${repositorySystemSession}", readonly = true)
    private RepositorySystemSession repoSession;

    /**
     * The project's remote repositories to use for the resolution.
     */
    @Parameter(defaultValue = "${project.remoteProjectRepositories}", readonly = true)
    private List<RemoteRepository> remoteRepos;

    /**
     * The {@code <groupId>:<artifactId>[:<extension>[:<classifier>]]:<version>} of the artifact to resolve.
     */
    @Parameter(property = "resolver.artifactCoords", readonly = true)
    private String artifactCoords;

    /**
     * The entry point to Maven Artifact Resolver; that is, the component doing all the work.
     */
    private final RepositorySystem repoSystem;

    @Inject
    public ResolveArtifactMojo(RepositorySystem repoSystem) {
        this.repoSystem = repoSystem;
    }

    /**
     * The actual execution of the mojo.
     */
    public void execute() throws MojoExecutionException, MojoFailureException {
        Artifact artifact;
        try {
            artifact = new DefaultArtifact(artifactCoords);
        } catch (IllegalArgumentException e) {
            throw new MojoFailureException(e.getMessage(), e);
        }

        ArtifactRequest request = new ArtifactRequest();
        request.setArtifact(artifact);
        request.setRepositories(remoteRepos);

        LOGGER.info("Resolving artifact {} from {}", artifact, remoteRepos);

        ArtifactResult result;
        try {
            result = repoSystem.resolveArtifact(repoSession, request);
        } catch (ArtifactResolutionException e) {
            throw new MojoExecutionException(e.getMessage(), e);
        }

        LOGGER.info(
                "Resolved artifact {} to {} from {}",
                artifact,
                result.getArtifact().getFile(),
                result.getRepository());
    }
}
