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/*
 * The MIT License
 *
 * Copyright (c) 2004, The Codehaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.codehaus.mojo.natives.compiler;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.codehaus.mojo.natives.NativeBuildException;
import org.codehaus.mojo.natives.SourceDependencyAnalyzer;
import org.codehaus.mojo.natives.parser.Parser;
import org.codehaus.mojo.natives.util.CommandLineUtil;
import org.codehaus.mojo.natives.util.EnvUtil;
import org.codehaus.plexus.logging.AbstractLogEnabled;
import org.codehaus.plexus.logging.Logger;
import org.codehaus.plexus.util.FileUtils;
import org.codehaus.plexus.util.Os;
import org.codehaus.plexus.util.cli.Commandline;

public abstract class AbstractCompiler
    extends AbstractLogEnabled
    implements Compiler
{

    protected abstract Parser getParser();

    protected abstract Commandline getCommandLine( File src, File dest, CompilerConfiguration config )
        throws NativeBuildException;

    @Override
    public List compile( CompilerConfiguration config, File[] sourceFiles )
        throws NativeBuildException
    {
        if ( !config.getOutputDirectory().exists() )
        {
            config.getOutputDirectory().mkdirs();
        }

        List compilerOutputFiles = new ArrayList<>( sourceFiles.length );

        CompilerThreadPoolExecutor compilerThreadPoolExecutor = null;

        if ( config.getNumberOfConcurrentCompilation() > 1 )
        {
            compilerThreadPoolExecutor = new CompilerThreadPoolExecutor( config.getNumberOfConcurrentCompilation() );
        }

        for ( File source : sourceFiles )
        {
            File objectFile = getObjectFile( source, config.getOutputDirectory(), config.getObjectFileExtension() );

            compilerOutputFiles.add( objectFile );

            Parser parser = this.getParser();

            if ( SourceDependencyAnalyzer.isStaled( source, objectFile, parser, config.getIncludePaths() ) )
            {
                if ( compilerThreadPoolExecutor != null && compilerThreadPoolExecutor.isErrorFound() )
                {
                    break;
                }

                Commandline cl = getCommandLine( source, objectFile, config );
                EnvUtil.setupCommandlineEnv( cl, config.getEnvFactory() );

                if ( compilerThreadPoolExecutor != null )
                {
                    try
                    {
                        compilerThreadPoolExecutor.execute( new CompilerRunnable( cl, this.getLogger() ) );
                    }
                    catch ( RejectedExecutionException e )
                    {
                        CommandLineUtil.execute( cl, this.getLogger() );
                    }
                }
                else
                {
                    CommandLineUtil.execute( cl, this.getLogger() );
                }

            }
            else
            {
                this.getLogger().debug( ( objectFile + " is up to date." ) );
            }
        }

        if ( compilerThreadPoolExecutor != null )
        {
            if ( !compilerThreadPoolExecutor.isErrorFound() )
            {
                compilerThreadPoolExecutor.shutdown();
            }

            try
            {
                compilerThreadPoolExecutor.awaitTermination( Integer.MAX_VALUE, TimeUnit.SECONDS );
            }
            catch ( InterruptedException e )
            {
            }

            if ( compilerThreadPoolExecutor.isErrorFound() )
            {
                throw new NativeBuildException( "Compilation failure detected." );
            }
        }

        return compilerOutputFiles;
    }

    /**
     * return "obj" or "o" when file extension is not given based on current platform
     *
     * @return
     */
    protected static String getObjectFileExtension( String fileExtension )
    {
        if ( fileExtension != null )
        {
            return fileExtension;
        }
        else
        {
            if ( Os.isFamily( "windows" ) )
            {
                return "obj";
            }
            else
            {
                return "o";
            }
        }
    }

    /**
     * Figure out the object file relative path from a given source file
     *
     * @param sourceFile
     * @param workingDirectory
     * @param outputDirectory
     * @param config
     * @return
     */
    protected static File getObjectFile( File sourceFile, File outputDirectory, String objectFileExtension )
        throws NativeBuildException
    {
        String objectFileName;

        try
        {
            objectFileExtension = AbstractCompiler.getObjectFileExtension( objectFileExtension );

            // plexus-util requires that we remove all ".." in the the file source, so getCanonicalPath is required
            // other filename with .. and no extension will throw StringIndexOutOfBoundsException

            objectFileName = FileUtils.basename( sourceFile.getCanonicalPath() );

            if ( objectFileName.charAt( objectFileName.length() - 1 ) != '.' )
            {
                objectFileName += "." + objectFileExtension;
            }
            else
            {
                objectFileName += objectFileExtension;
            }
        }
        catch ( IOException e )
        {
            throw new NativeBuildException(
                    "Failed to figure out object file name for " + sourceFile + ": " + e.getMessage(), e );
        }

        File objectFile = new File( outputDirectory, objectFileName );

        return objectFile;

    }

    private class CompilerThreadPoolExecutor
            extends ThreadPoolExecutor
    {
        private boolean errorFound = false;

        public synchronized void setErrorFound( boolean errorFound )
        {
            this.errorFound = errorFound;
        }

        public synchronized boolean isErrorFound()
        {
            return errorFound;
        }

        public CompilerThreadPoolExecutor( int corePoolSize )
        {
            super( corePoolSize, corePoolSize, 30, TimeUnit.SECONDS, new ArrayBlockingQueue<>( corePoolSize * 2 ) );
        }

        @Override
        protected void afterExecute( Runnable r, Throwable t )
        {
            super.afterExecute( r, t );

            if ( t != null )
            {
                this.setErrorFound( true );

                this.shutdown();
            }
        }

        @Override
        protected void beforeExecute( Thread t, Runnable r )
        {
            super.beforeExecute( t, r );

            // fail fast
            if ( this.isErrorFound() )
            {
                ( (CompilerRunnable) r ).setSkip( true );
            }
        }
    }

    public class CompilerRunnable
        implements Runnable
    {
        private Commandline cl;

        private Logger logger;

        private boolean skip = false;

        public void setSkip( boolean skip )
        {
            this.skip = skip;
        }

        public CompilerRunnable( Commandline cl, Logger logger )
        {
            this.cl = cl;
            this.logger = logger;
        }

        @Override
        public void run()
            throws NativeBuildException
        {
            if ( skip )
            {
                return;
            }

            CommandLineUtil.execute( cl, logger );
        }

    }

}