package org.apache.maven.plugins.invoker;

/*
 * 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 static org.apache.maven.shared.utils.logging.MessageUtils.buffer;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.invoker.model.BuildJob;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.shared.utils.io.IOUtil;

/**
 * Tracks a set of build jobs and their results.
 *
 * @author Benjamin Bentmann
 */
class InvokerSession
{
    private static final String SEPARATOR = buffer().strong(
            "-------------------------------------------------" ).toString();

    private List<BuildJob> buildJobs;

    private List<BuildJob> failedJobs;

    private List<BuildJob> errorJobs;

    private List<BuildJob> successfulJobs;

    private List<BuildJob> skippedJobs;

    /**
     * Creates a new empty session.
     */
    InvokerSession()
    {
        buildJobs = new ArrayList<>();
    }

    /**
     * Creates a session that initially contains the specified build jobs.
     *
     * @param buildJobs The build jobs to set, must not be <code>null</code>.
     */
    InvokerSession( List<BuildJob> buildJobs )
    {
        this.buildJobs = new ArrayList<>( buildJobs );
    }

    /**
     * Adds the specified build job to this session.
     *
     * @param buildJob The build job to add, must not be <code>null</code>.
     */
    public void addJob( BuildJob buildJob )
    {
        buildJobs.add( buildJob );

        resetStats();
    }

    /**
     * Sets the build jobs of this session.
     *
     * @param buildJobs The build jobs to set, must not be <code>null</code>.
     */
    public void setJobs( List<? extends BuildJob> buildJobs )
    {
        this.buildJobs = new ArrayList<>( buildJobs );

        resetStats();
    }

    /**
     * Gets the build jobs in this session.
     *
     * @return The build jobs in this session, can be empty but never <code>null</code>.
     */
    public List<BuildJob> getJobs()
    {
        return buildJobs;
    }

    /**
     * Gets the successful build jobs in this session.
     *
     * @return The successful build jobs in this session, can be empty but never <code>null</code>.
     */
    public List<BuildJob> getSuccessfulJobs()
    {
        updateStats();

        return successfulJobs;
    }

    /**
     * Gets the failed build jobs in this session.
     *
     * @return The failed build jobs in this session, can be empty but never <code>null</code>.
     */
    public List<BuildJob> getFailedJobs()
    {
        updateStats();

        return failedJobs;
    }

    /**
     * Gets the build jobs which had errors for this session.
     *
     * @return The build jobs in error for this session, can be empty but never <code>null</code>.
     */
    public List<BuildJob> getErrorJobs()
    {
        updateStats();

        return errorJobs;
    }

    /**
     * Gets the skipped build jobs in this session.
     *
     * @return The skipped build jobs in this session, can be empty but never <code>null</code>.
     */
    public List<BuildJob> getSkippedJobs()
    {
        updateStats();

        return skippedJobs;
    }

    private void resetStats()
    {
        successfulJobs = null;
        failedJobs = null;
        skippedJobs = null;
        errorJobs = null;
    }

    private void updateStats()
    {
        if ( successfulJobs != null && skippedJobs != null && failedJobs != null && errorJobs != null )
        {
            return;
        }

        successfulJobs = new ArrayList<>();
        failedJobs = new ArrayList<>();
        skippedJobs = new ArrayList<>();
        errorJobs = new ArrayList<>();

        for ( BuildJob buildJob : buildJobs )
        {
            if ( BuildJob.Result.SUCCESS.equals( buildJob.getResult() ) )
            {
                successfulJobs.add( buildJob );
            }
            else if ( BuildJob.Result.SKIPPED.equals( buildJob.getResult() ) )
            {
                skippedJobs.add( buildJob );
            }
            else if ( BuildJob.Result.ERROR.equals( buildJob.getResult() ) )
            {
                errorJobs.add( buildJob );
            }
            else if ( buildJob.getResult() != null )
            {
                failedJobs.add( buildJob );
            }
        }
    }

    /**
     * Prints a summary of this session to the specified logger.
     *
     * @param logger The mojo logger to output messages to, must not be <code>null</code>.
     * @param ignoreFailures A flag whether failures should be ignored or whether a build failure should be signaled.
     */
    public void logSummary( Log logger, boolean ignoreFailures )
    {
        updateStats();

        logger.info( SEPARATOR );
        logger.info( "Build Summary:" );
        logger.info( "  Passed: " + successfulJobs.size()
                + ", Failed: " + failedJobs.size()
                + ", Errors: " + errorJobs.size()
                + ", Skipped: " + skippedJobs.size() );
        logger.info( SEPARATOR );

        logBuildJobList( logger, ignoreFailures, "The following builds failed:", failedJobs );
        logBuildJobList( logger, ignoreFailures, "The following builds finished with error:", errorJobs );
        logBuildJobList( logger, true, "The following builds were skipped:", skippedJobs );
    }

    public void logFailedBuildLog( Log logger, boolean ignoreFailures )
            throws MojoFailureException
    {
        List<BuildJob> jobToLogs = new ArrayList<>( failedJobs );
        jobToLogs.addAll( errorJobs );

        for ( BuildJob buildJob: jobToLogs )
        {
            File buildLogFile = buildJob.getBuildlog() != null ? new File( buildJob.getBuildlog() ) : null;
            if ( buildLogFile != null && buildLogFile.exists() )
            {
                try
                {
                    // prepare message with build.log in one string to omit begin [ERROR], [WARN]
                    // so whole log will be displayed without decoration
                    StringBuilder buildLogMessage = new StringBuilder( );
                    buildLogMessage.append( System.lineSeparator() );
                    buildLogMessage.append( System.lineSeparator() );
                    buildLogMessage.append( "*** begin build.log for: " + buildJob.getProject() + " ***" );
                    buildLogMessage.append( System.lineSeparator() );
                    try ( FileReader buildLogReader = new FileReader( buildLogFile ) )
                    {
                        buildLogMessage.append( IOUtil.toString( buildLogReader ) );
                    }
                    buildLogMessage.append( "*** end build.log for: " + buildJob.getProject() + " ***" );
                    buildLogMessage.append( System.lineSeparator() );

                    logWithLevel( logger, ignoreFailures, SEPARATOR );
                    logWithLevel( logger, ignoreFailures,  buildLogMessage.toString() );
                    logWithLevel( logger, ignoreFailures, SEPARATOR );
                    logWithLevel( logger, ignoreFailures, "" );

                }
                catch ( IOException e )
                {
                    throw new MojoFailureException( e.getMessage(), e );
                }
            }
        }
    }


    /**
     * Handles the build failures in this session.
     *
     * @param logger The mojo logger to output messages to, must not be <code>null</code>.
     * @param ignoreFailures A flag whether failures should be ignored or whether a build failure should be signaled.
     * @throws MojoFailureException If failures are present and not ignored.
     */
    public void handleFailures( Log logger, boolean ignoreFailures )
        throws MojoFailureException
    {
        updateStats();

        if ( !failedJobs.isEmpty() )
        {
            String message = failedJobs.size() + " build" + ( failedJobs.size() == 1 ? "" : "s" ) + " failed.";

            if ( ignoreFailures )
            {
                logger.warn( "Ignoring that " + message );
            }
            else
            {
                throw new MojoFailureException( message + " See console output above for details." );
            }
        }

        if ( !errorJobs.isEmpty() )
        {
            String message = errorJobs.size() + " build" + ( errorJobs.size() == 1 ? "" : "s" ) + " in error.";

            if ( ignoreFailures )
            {
                logger.warn( "Ignoring that " + message );
            }
            else
            {
                throw new MojoFailureException( message + " See console output above for details." );
            }
        }
    }

    /**
     * Log list of jobs.
     *
     * @param logger logger to write
     * @param warn flag indicate log level
     * @param buildJobs jobs to list
     */
    private void logBuildJobList( Log logger, boolean warn, String header, List<BuildJob> buildJobs )
    {
        if ( buildJobs.isEmpty() )
        {
            return;
        }

        logWithLevel( logger, warn, header );

        for ( BuildJob buildJob : buildJobs )
        {
            logWithLevel( logger, warn, "*  " + buildJob.getProject() );
        }

        logger.info( SEPARATOR );
    }

    /**
     * Log message in correct level depends on flag.
     *
     * @param logger logger to write
     * @param warn flag indicate log level
     * @param message message to write
     */
    private void logWithLevel( Log logger, boolean warn, String message )
    {

        if ( warn )
        {
            logger.warn( message );
        }
        else
        {
            logger.error( message );
        }
    }
}