/*
 * 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.scm.plugin;

import javax.inject.Inject;

import java.io.File;
import java.io.IOException;

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.scm.CommandParameter;
import org.apache.maven.scm.CommandParameters;
import org.apache.maven.scm.ScmException;
import org.apache.maven.scm.ScmFileSet;
import org.apache.maven.scm.ScmResult;
import org.apache.maven.scm.manager.ScmManager;
import org.apache.maven.scm.repository.ScmRepository;
import org.apache.maven.settings.crypto.SettingsDecrypter;
import org.codehaus.plexus.util.FileUtils;

/**
 * Get a fresh copy of the latest source from the configured scm url.
 *
 * @author <a href="evenisse@apache.org">Emmanuel Venisse</a>
 */
@Mojo(name = "checkout", requiresProject = false)
public class CheckoutMojo extends AbstractScmMojo {
    /**
     * Use Export instead of checkout.
     */
    @Parameter(property = "useExport", defaultValue = "false")
    private boolean useExport;

    /**
     * The directory to checkout the sources to for the bootstrap and checkout goals.
     */
    @Parameter(property = "checkoutDirectory", defaultValue = "${project.build.directory}/checkout")
    private File checkoutDirectory;

    /**
     * Skip checkout if checkoutDirectory exists.
     */
    @Parameter(property = "skipCheckoutIfExists", defaultValue = "false")
    private boolean skipCheckoutIfExists = false;

    /**
     * The version type (branch/tag/revision) of scmVersion.
     */
    @Parameter(property = "scmVersionType")
    private String scmVersionType;

    /**
     * The version (revision number/branch name/tag name).
     */
    @Parameter(property = "scmVersion")
    private String scmVersion;

    /**
     * Currently only implemented with Git Executable. Perform a shallow checkout.
     *
     * @since 2.2.1
     */
    @Parameter(property = "shallow", defaultValue = "false")
    private boolean shallow = false;

    /**
     * Allow extended mojo (ie BootStrap ) to see checkout result.
     */
    private ScmResult checkoutResult;

    @Inject
    public CheckoutMojo(ScmManager manager, SettingsDecrypter settingsDecrypter) {
        super(manager, settingsDecrypter);
    }

    /**
     * {@inheritDoc}
     */
    public void execute() throws MojoExecutionException {
        super.execute();

        // skip checkout if checkout directory is already created. See SCM-201
        checkoutResult = null;
        if (!getCheckoutDirectory().isDirectory() || !this.skipCheckoutIfExists) {
            checkoutResult = checkout();
        }
    }

    protected File getCheckoutDirectory() {
        if (this.checkoutDirectory.getPath().contains("${project.basedir}")) {
            // project.basedir is not set under maven 3.x when run without a project
            this.checkoutDirectory = new File(this.getBasedir(), "target/checkout");
        }
        return this.checkoutDirectory;
    }

    public void setCheckoutDirectory(File checkoutDirectory) {
        this.checkoutDirectory = checkoutDirectory;
    }

    protected ScmResult checkout() throws MojoExecutionException {
        try {
            ScmRepository repository = getScmRepository();

            this.prepareOutputDirectory(getCheckoutDirectory());

            ScmResult result = null;

            ScmFileSet fileSet = new ScmFileSet(getCheckoutDirectory().getAbsoluteFile());
            if (useExport) {
                result = getScmManager().export(repository, fileSet, getScmVersion(scmVersionType, scmVersion));
            } else {
                CommandParameters parameters = new CommandParameters();
                parameters.setString(CommandParameter.RECURSIVE, Boolean.toString(true));
                parameters.setString(CommandParameter.SHALLOW, Boolean.toString(shallow));
                result = getScmManager()
                        .getProviderByRepository(repository)
                        .checkOut(repository, fileSet, getScmVersion(scmVersionType, scmVersion), parameters);
            }

            checkResult(result);

            handleExcludesIncludesAfterCheckoutAndExport(this.checkoutDirectory);

            return result;
        } catch (ScmException e) {
            throw new MojoExecutionException("Cannot run checkout command : ", e);
        }
    }

    private void prepareOutputDirectory(File ouputDirectory) throws MojoExecutionException {
        try {
            this.getLog().debug("Removing " + ouputDirectory);

            FileUtils.deleteDirectory(getCheckoutDirectory());
        } catch (IOException e) {
            throw new MojoExecutionException("Cannot remove " + ouputDirectory);
        }

        if (!getCheckoutDirectory().mkdirs()) {
            throw new MojoExecutionException("Cannot create " + ouputDirectory);
        }
    }

    protected ScmResult getCheckoutResult() {
        return checkoutResult;
    }
}
