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/*
 * Copyright (c) 2002-2018 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.consistency;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.neo4j.consistency.checking.full.ConsistencyCheckIncompleteException;
import org.neo4j.consistency.checking.full.ConsistencyFlags;
import org.neo4j.consistency.checking.full.FullCheck;
import org.neo4j.consistency.report.ConsistencySummaryStatistics;
import org.neo4j.consistency.statistics.AccessStatistics;
import org.neo4j.consistency.statistics.AccessStatsKeepingStoreAccess;
import org.neo4j.consistency.statistics.DefaultCounts;
import org.neo4j.consistency.statistics.Statistics;
import org.neo4j.consistency.statistics.VerboseStatistics;
import org.neo4j.function.Suppliers;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.helpers.progress.ProgressMonitorFactory;
import org.neo4j.index.internal.gbptree.RecoveryCleanupWorkCollector;
import org.neo4j.io.fs.DefaultFileSystemAbstraction;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.io.pagecache.tracing.PageCacheTracer;
import org.neo4j.io.pagecache.tracing.cursor.PageCursorTracerSupplier;
import org.neo4j.io.pagecache.tracing.cursor.context.EmptyVersionContextSupplier;
import org.neo4j.kernel.api.direct.DirectStoreAccess;
import org.neo4j.kernel.api.labelscan.LabelScanStore;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.extension.KernelExtensions;
import org.neo4j.kernel.impl.api.index.IndexProviderMap;
import org.neo4j.kernel.impl.api.scan.FullStoreChangeStream;
import org.neo4j.kernel.impl.index.labelscan.NativeLabelScanStore;
import org.neo4j.kernel.impl.logging.SimpleLogService;
import org.neo4j.kernel.impl.pagecache.ConfiguringPageCacheFactory;
import org.neo4j.kernel.impl.store.NeoStores;
import org.neo4j.kernel.impl.store.StoreAccess;
import org.neo4j.kernel.impl.store.StoreFactory;
import org.neo4j.kernel.impl.store.id.DefaultIdGeneratorFactory;
import org.neo4j.kernel.lifecycle.LifeSupport;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.logging.DuplicatingLog;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;

import static java.lang.String.format;
import static org.neo4j.consistency.internal.SchemaIndexExtensionLoader.instantiateKernelExtensions;
import static org.neo4j.consistency.internal.SchemaIndexExtensionLoader.loadIndexProviders;
import static org.neo4j.io.file.Files.createOrOpenAsOutputStream;
import static org.neo4j.kernel.configuration.Settings.FALSE;
import static org.neo4j.kernel.configuration.Settings.TRUE;
import static org.neo4j.kernel.impl.factory.DatabaseInfo.COMMUNITY;

public class ConsistencyCheckService
{
    private final Date timestamp;

    public ConsistencyCheckService()
    {
        this( new Date() );
    }

    public ConsistencyCheckService( Date timestamp )
    {
        this.timestamp = timestamp;
    }

    @Deprecated
    public Result runFullConsistencyCheck( File storeDir, Config tuningConfiguration,
            ProgressMonitorFactory progressFactory, LogProvider logProvider, boolean verbose )
            throws ConsistencyCheckIncompleteException
    {
        return runFullConsistencyCheck( storeDir, tuningConfiguration, progressFactory, logProvider, verbose,
                new ConsistencyFlags( tuningConfiguration ) );
    }

    public Result runFullConsistencyCheck( File storeDir, Config config, ProgressMonitorFactory progressFactory,
            LogProvider logProvider, boolean verbose, ConsistencyFlags consistencyFlags )
            throws ConsistencyCheckIncompleteException
    {
        FileSystemAbstraction fileSystem = new DefaultFileSystemAbstraction();
        try
        {
            return runFullConsistencyCheck( storeDir, config, progressFactory, logProvider,
                    fileSystem, verbose, consistencyFlags );
        }
        finally
        {
            try
            {
                fileSystem.close();
            }
            catch ( IOException e )
            {
                Log log = logProvider.getLog( getClass() );
                log.error( "Failure during shutdown of file system", e );
            }
        }
    }

    @Deprecated
    public Result runFullConsistencyCheck( File storeDir, Config tuningConfiguration,
            ProgressMonitorFactory progressFactory, LogProvider logProvider, FileSystemAbstraction fileSystem,
            boolean verbose ) throws ConsistencyCheckIncompleteException
    {
        return runFullConsistencyCheck( storeDir, tuningConfiguration, progressFactory, logProvider, fileSystem,
                verbose, new ConsistencyFlags( tuningConfiguration ) );
    }

    public Result runFullConsistencyCheck( File storeDir, Config config, ProgressMonitorFactory progressFactory,
            LogProvider logProvider, FileSystemAbstraction fileSystem, boolean verbose,
            ConsistencyFlags consistencyFlags ) throws ConsistencyCheckIncompleteException
    {
        return runFullConsistencyCheck( storeDir, config, progressFactory, logProvider, fileSystem,
                verbose, defaultReportDir( config, storeDir ), consistencyFlags );
    }

    @Deprecated
    public Result runFullConsistencyCheck( File storeDir, Config tuningConfiguration,
            ProgressMonitorFactory progressFactory, LogProvider logProvider, FileSystemAbstraction fileSystem,
            boolean verbose, File reportDir ) throws ConsistencyCheckIncompleteException
    {
        return runFullConsistencyCheck( storeDir, tuningConfiguration, progressFactory, logProvider, fileSystem,
                verbose, reportDir, new ConsistencyFlags( tuningConfiguration ) );
    }

    public Result runFullConsistencyCheck( File storeDir, Config config, ProgressMonitorFactory progressFactory,
            LogProvider logProvider, FileSystemAbstraction fileSystem, boolean verbose, File reportDir,
            ConsistencyFlags consistencyFlags ) throws ConsistencyCheckIncompleteException
    {
        Log log = logProvider.getLog( getClass() );
        ConfiguringPageCacheFactory pageCacheFactory = new ConfiguringPageCacheFactory(
                fileSystem, config, PageCacheTracer.NULL, PageCursorTracerSupplier.NULL,
                logProvider.getLog( PageCache.class ), EmptyVersionContextSupplier.EMPTY );
        PageCache pageCache = pageCacheFactory.getOrCreatePageCache();

        try
        {
            return runFullConsistencyCheck( storeDir, config, progressFactory, logProvider, fileSystem,
                    pageCache, verbose, reportDir, consistencyFlags );
        }
        finally
        {
            try
            {
                pageCache.close();
            }
            catch ( Exception e )
            {
                log.error( "Failure during shutdown of the page cache", e );
            }
        }
    }

    @Deprecated
    public Result runFullConsistencyCheck( final File storeDir, Config tuningConfiguration,
            ProgressMonitorFactory progressFactory, final LogProvider logProvider,
            final FileSystemAbstraction fileSystem, final PageCache pageCache, final boolean verbose )
            throws ConsistencyCheckIncompleteException
    {
        return runFullConsistencyCheck( storeDir, tuningConfiguration, progressFactory, logProvider, fileSystem,
                pageCache, verbose, new ConsistencyFlags( tuningConfiguration ) );
    }

    public Result runFullConsistencyCheck( final File storeDir, Config config, ProgressMonitorFactory progressFactory,
            final LogProvider logProvider, final FileSystemAbstraction fileSystem, final PageCache pageCache,
            final boolean verbose, ConsistencyFlags consistencyFlags )
            throws ConsistencyCheckIncompleteException
    {
        return runFullConsistencyCheck( storeDir, config, progressFactory, logProvider, fileSystem, pageCache,
                verbose, defaultReportDir( config, storeDir ), consistencyFlags );
    }

    @Deprecated
    public Result runFullConsistencyCheck( final File storeDir, Config tuningConfiguration,
            ProgressMonitorFactory progressFactory, final LogProvider logProvider,
            final FileSystemAbstraction fileSystem, final PageCache pageCache, final boolean verbose, File reportDir )
            throws ConsistencyCheckIncompleteException
    {
        return runFullConsistencyCheck( storeDir, tuningConfiguration, progressFactory, logProvider, fileSystem,
                pageCache, verbose, reportDir, new ConsistencyFlags( tuningConfiguration ) );
    }

    public Result runFullConsistencyCheck( final File storeDir, Config config, ProgressMonitorFactory progressFactory,
            final LogProvider logProvider, final FileSystemAbstraction fileSystem, final PageCache pageCache,
            final boolean verbose, File reportDir, ConsistencyFlags consistencyFlags )
            throws ConsistencyCheckIncompleteException
    {
        Log log = logProvider.getLog( getClass() );
        config.augment( GraphDatabaseSettings.read_only, TRUE );
        config.augment( GraphDatabaseSettings.pagecache_warmup_enabled, FALSE );

        StoreFactory factory = new StoreFactory( storeDir, config,
                new DefaultIdGeneratorFactory( fileSystem ), pageCache, fileSystem, logProvider, EmptyVersionContextSupplier.EMPTY );

        ConsistencySummaryStatistics summary;
        final File reportFile = chooseReportPath( reportDir );
        Log reportLog = new ConsistencyReportLog( Suppliers.lazySingleton( () ->
        {
            try
            {
                return new PrintWriter( createOrOpenAsOutputStream( fileSystem, reportFile, true ) );
            }
            catch ( IOException e )
            {
                throw new RuntimeException( e );
            }
        } ) );

        // Bootstrap kernel extensions
        Monitors monitors = new Monitors();
        LifeSupport life = new LifeSupport();
        KernelExtensions extensions = life.add( instantiateKernelExtensions( storeDir,
                fileSystem, config, new SimpleLogService( logProvider, logProvider ), pageCache,
                RecoveryCleanupWorkCollector.ignore(),
                // May be enterprise edition, but in consistency checker we only care about the operational mode
                COMMUNITY,
                monitors ) );

        try ( NeoStores neoStores = factory.openAllNeoStores() )
        {
            life.start();

            IndexProviderMap indexes = loadIndexProviders( extensions );

            LabelScanStore labelScanStore =
                    new NativeLabelScanStore( pageCache, storeDir, FullStoreChangeStream.EMPTY, true, monitors,
                            RecoveryCleanupWorkCollector.ignore() );
            life.add( labelScanStore );

            int numberOfThreads = defaultConsistencyCheckThreadsNumber();
            Statistics statistics;
            StoreAccess storeAccess;
            AccessStatistics stats = new AccessStatistics();
            if ( verbose )
            {
                statistics = new VerboseStatistics( stats, new DefaultCounts( numberOfThreads ), log );
                storeAccess = new AccessStatsKeepingStoreAccess( neoStores, stats );
            }
            else
            {
                statistics = Statistics.NONE;
                storeAccess = new StoreAccess( neoStores );
            }
            storeAccess.initialize();
            DirectStoreAccess stores = new DirectStoreAccess( storeAccess, labelScanStore, indexes );
            FullCheck check = new FullCheck(
                    progressFactory, statistics, numberOfThreads, consistencyFlags, config );
            summary = check.execute( stores, new DuplicatingLog( log, reportLog ) );
        }
        finally
        {
            life.shutdown();
        }

        if ( !summary.isConsistent() )
        {
            log.warn( "See '%s' for a detailed consistency report.", reportFile.getPath() );
            return Result.failure( reportFile );
        }
        return Result.success( reportFile );
    }

    private File chooseReportPath( File reportDir )
    {
        return new File( reportDir, defaultLogFileName( timestamp ) );
    }

    private File defaultReportDir( Config tuningConfiguration, File storeDir )
    {
        if ( tuningConfiguration.get( GraphDatabaseSettings.neo4j_home ) == null )
        {
            tuningConfiguration.augment( GraphDatabaseSettings.neo4j_home, storeDir.getAbsolutePath() );
        }

        return tuningConfiguration.get( GraphDatabaseSettings.logs_directory );
    }

    private static String defaultLogFileName( Date date )
    {
        return format( "inconsistencies-%s.report", new SimpleDateFormat( "yyyy-MM-dd.HH.mm.ss" ).format( date ) );
    }

    public interface Result
    {
        static Result failure( File reportFile )
        {
            return new Result()
            {
                @Override
                public boolean isSuccessful()
                {
                    return false;
                }

                @Override
                public File reportFile()
                {
                    return reportFile;
                }
            };
        }

        static Result success( File reportFile )
        {
            return new Result()
            {
                @Override
                public boolean isSuccessful()
                {
                    return true;
                }

                @Override
                public File reportFile()
                {
                    return reportFile;
                }
            };
        }

        boolean isSuccessful();

        File reportFile();
    }

    public static int defaultConsistencyCheckThreadsNumber()
    {
        return Math.max( 1, Runtime.getRuntime().availableProcessors() - 1 );
    }
}