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.util.List;

import org.apache.maven.model.Resource;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.ResolutionScope;
import org.apache.maven.plugins.checkstyle.exec.CheckstyleExecutorRequest;
import org.apache.maven.project.MavenProject;
import org.apache.maven.reporting.MavenReportException;

/**
 * A reporting task that performs Checkstyle analysis and generates an HTML
 * report on any violations that Checkstyle finds.
 *
 * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
 * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a>
 * @author <a href="mailto:joakim@erdfelt.com">Joakim Erdfelt</a>
 *
 */
@Mojo( name = "checkstyle", requiresDependencyResolution = ResolutionScope.COMPILE, threadSafe = true )
public class CheckstyleReport
    extends AbstractCheckstyleReport
{

    /** {@inheritDoc} */
    protected MavenProject getProject()
    {
        return project;
    }

    /**
     * {@inheritDoc}
     */
    protected CheckstyleExecutorRequest createRequest()
            throws MavenReportException
    {
        CheckstyleExecutorRequest request = new CheckstyleExecutorRequest();
        request.setConsoleListener( getConsoleListener() ).setConsoleOutput( consoleOutput )
            .setExcludes( excludes ).setFailsOnError( failsOnError ).setIncludes( includes )
            .setResourceIncludes( resourceIncludes )
            .setResourceExcludes( resourceExcludes )
            .setIncludeResources( includeResources )
            .setIncludeTestResources( includeTestResources )
            .setIncludeTestSourceDirectory( includeTestSourceDirectory ).setListener( getListener() )
            .setProject( project ).setSourceDirectories( getSourceDirectories() )
            .setResources( resources )
            .setStringOutputStream( stringOutputStream ).setSuppressionsLocation( suppressionsLocation )
            .setTestSourceDirectories( getTestSourceDirectories() ).setConfigLocation( configLocation )
            .setPropertyExpansion( propertyExpansion ).setHeaderLocation( headerLocation )
            .setCacheFile( cacheFile ).setSuppressionsFileExpression( suppressionsFileExpression )
            .setEncoding( getInputEncoding() ).setPropertiesLocation( propertiesLocation );
        return request;
    }

    /** {@inheritDoc} */
    public String getOutputName()
    {
        return "checkstyle";
    }

    /** {@inheritDoc} */
    public boolean canGenerateReport()
    {
        if ( skip )
        {
            return false;
        }

        // TODO: would be good to scan the files here
        for ( File sourceDirectory : getSourceDirectories() )
        {
            if ( sourceDirectory.exists() )
            {
                return true;
            }
        }

        if ( includeTestSourceDirectory )
        {
            for ( File testSourceDirectory : getTestSourceDirectories() )
            {
                if ( testSourceDirectory.exists() )
                {
                    return true;
                }
            }
        }

        return ( ( includeResources && hasResources( resources ) )
            || ( includeTestResources && hasResources( testResources ) )
        );
    }

    /**
     * Check if any of the resources exist.
     * @param resources The resources to check
     * @return <code>true</code> if the resource directory exist
     */
    private boolean hasResources( List<Resource> resources )
    {
        for ( Resource resource : resources )
        {
            if ( new File( resource.getDirectory() ).exists() )
            {
                return true;
            }
        }
      return false;
    }

}