package org.apache.maven.plugins.checkstyle;

/*
 * 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.
 */

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.Locale;

import org.apache.maven.plugin.LegacySupport;
import org.apache.maven.plugin.testing.AbstractMojoTestCase;
import org.apache.maven.plugin.testing.ArtifactStubFactory;
import org.apache.maven.plugin.testing.stubs.MavenProjectStub;
import org.apache.maven.project.DefaultProjectBuildingRequest;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.ProjectBuilder;
import org.apache.maven.project.ProjectBuildingRequest;
import org.eclipse.aether.internal.impl.SimpleLocalRepositoryManagerFactory;
import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.repository.LocalRepository;

/**
 * Abstract class to test reports generation.
 */
public abstract class AbstractCheckstyleTestCase
    extends AbstractMojoTestCase
{
    private Locale oldLocale;

    private ArtifactStubFactory artifactStubFactory;

    /**
     * The current project to be test.
     */
    private MavenProject testMavenProject;

    @Override
    protected void setUp()
        throws Exception
    {
        // required for mojo lookups to work
        super.setUp();

        oldLocale = Locale.getDefault();
        Locale.setDefault( Locale.ENGLISH );

        artifactStubFactory = new DependencyArtifactStubFactory( getTestFile( "target" ), true, false );
        artifactStubFactory.getWorkingDir().mkdirs();
    }

    @Override
    protected void tearDown()
        throws Exception
    {
        super.tearDown();

        Locale.setDefault( oldLocale );
        oldLocale = null;
    }

    /**
     * Get the current Maven project
     *
     * @return the maven project
     */
    protected MavenProject getTestMavenProject()
    {
        return testMavenProject;
    }

    /**
     * Get the generated report as file in the test maven project.
     *
     * @param name the name of the report.
     * @return the generated report as file
     * @throws IOException if the return file doesnt exist
     */
    protected File getGeneratedReport( String name )
        throws IOException
    {
        String outputDirectory = getBasedir() + "/target/test/test-harness/" + getTestMavenProject().getArtifactId();

        File report = new File( outputDirectory, name );
        if ( !report.exists() )
        {
            throw new IOException( "File not found. Attempted: " + report );
        }

        return report;
    }

    /**
     * Generate the report and return the generated file
     *
     * @param goal the mojo goal.
     * @param pluginXml the name of the xml file in "src/test/resources/plugin-configs/".
     * @return the generated HTML file
     * @throws Exception if any
     */
    protected File generateReport( String goal, String pluginXml )
        throws Exception
    {
        File pluginXmlFile = new File( getBasedir(), "src/test/resources/plugin-configs/" + pluginXml );
        CheckstyleReport mojo  = createReportMojo( goal, pluginXmlFile );
        return generateReport( mojo, pluginXmlFile );
    }

    protected CheckstyleReport createReportMojo( String goal, File pluginXmlFile )
        throws Exception
    {
        CheckstyleReport mojo = (CheckstyleReport) lookupMojo( goal, pluginXmlFile );
        assertNotNull( "Mojo not found.", mojo );

        LegacySupport legacySupport = lookup( LegacySupport.class );
        legacySupport.setSession( newMavenSession( new MavenProjectStub() ) );
        DefaultRepositorySystemSession repoSession =
            (DefaultRepositorySystemSession) legacySupport.getRepositorySession();
        repoSession.setLocalRepositoryManager( new SimpleLocalRepositoryManagerFactory().newInstance( repoSession, new LocalRepository( artifactStubFactory.getWorkingDir() ) ) );

        setVariableValueToObject( mojo, "session", legacySupport.getSession() );
        setVariableValueToObject( mojo, "remoteRepositories", mojo.getProject().getRemoteArtifactRepositories() );
        return mojo;
    }

    protected File generateReport( CheckstyleReport mojo, File pluginXmlFile )
        throws Exception
    {
        mojo.execute();

        ProjectBuilder builder = lookup( ProjectBuilder.class );

        ProjectBuildingRequest buildingRequest = new DefaultProjectBuildingRequest();
        buildingRequest.setRepositorySession( lookup( LegacySupport.class ).getRepositorySession() );

        testMavenProject = builder.build( pluginXmlFile, buildingRequest ).getProject();

        File outputDir = mojo.getReportOutputDirectory();
        String filename = mojo.getOutputName() + ".html";

        return new File( outputDir, filename );
    }

    /**
     * Read the contents of the specified file object into a string
     */
    protected String readFile( File checkstyleTestDir, String fileName ) throws IOException
    {
        return new String( Files.readAllBytes( checkstyleTestDir.toPath().resolve( fileName ) ) );
    }

}