/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   *  Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *
 *   *  Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *
 *   *  Neither the name of the University of Southampton nor the names of its
 *      contributors may be used to endorse or promote products derived from this
 *      software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.openimaj.hadoop.tools.clusterquantiser;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper;
import org.kohsuke.args4j.CmdLineException;
import org.kohsuke.args4j.CmdLineOptionsProvider;
import org.kohsuke.args4j.Option;
import org.kohsuke.args4j.ProxyOptionHandler;
import org.openimaj.hadoop.sequencefile.SequenceFileUtility;
import org.openimaj.hadoop.tools.clusterquantiser.HadoopClusterQuantiserOptions.MapperMode.MapperModeOp;
import org.openimaj.hadoop.tools.clusterquantiser.HadoopClusterQuantiserTool.ClusterQuantiserMapper;
import org.openimaj.ml.clustering.SpatialClusters;
import org.openimaj.tools.clusterquantiser.AbstractClusterQuantiserOptions;
import org.openimaj.tools.clusterquantiser.ClusterType;
import org.openimaj.tools.clusterquantiser.ClusterType.ClusterTypeOp;

public class HadoopClusterQuantiserOptions extends AbstractClusterQuantiserOptions {

        enum MapperMode implements CmdLineOptionsProvider {
                STANDARD {
                        @Override
                        public MapperModeOp getOptions() {
                                return new StandardOp();
                        }
                },
                MULTITHREAD {
                        @Override
                        public MapperModeOp getOptions() {
                                return new MultithreadOp();
                        }
                };

                public static abstract class MapperModeOp {
                        public abstract void prepareJobMapper(Job job, Class<ClusterQuantiserMapper> mapperClass,
                                        AbstractClusterQuantiserOptions opts);
                }

                private static class StandardOp extends MapperModeOp {
                        @Override
                        public void prepareJobMapper(Job job, Class<ClusterQuantiserMapper> mapperClass,
                                        AbstractClusterQuantiserOptions opts)
                        {
                                job.setMapperClass(mapperClass);
                        }
                }

                private static class MultithreadOp extends MapperModeOp {

                        @Override
                        public void prepareJobMapper(Job job, Class<ClusterQuantiserMapper> mapperClass,
                                        AbstractClusterQuantiserOptions opts)
                        {
                                int concurrency = opts.getConcurrency();
                                if (opts.getConcurrency() <= 0)
                                        concurrency = Runtime.getRuntime().availableProcessors();

                                job.setMapperClass(MultithreadedMapper.class);
                                MultithreadedMapper.setNumberOfThreads(job, concurrency);
                                MultithreadedMapper.setMapperClass(job, mapperClass);
                                System.out.println("NThreads = " + MultithreadedMapper.getNumberOfThreads(job));
                        }
                }
        }

        private boolean beforeMaps;

        public HadoopClusterQuantiserOptions(String[] args) throws CmdLineException {
                this(args, false);
        }

        public HadoopClusterQuantiserOptions(String[] args, boolean beforeMaps) throws CmdLineException {
                super(args);
                this.beforeMaps = beforeMaps;
        }

        /*
         * IO args
         */
        @Option(name = "--input", aliases = "-i", required = true, usage = "set the input sequencefile")
        private String input = null;

        @Option(name = "--output", aliases = "-o", required = true, usage = "set the output directory")
        private String output = null;

        @Option(
                        name = "--force-delete",
                        aliases = "-rm",
                        required = false,
                        usage = "If it exists, remove the output directory before starting")
        private boolean forceRM = false;

        @Option(
                        name = "--mapper-mode",
                        aliases = "-mm",
                        required = false,
                        usage = "Choose a mapper mode.",
                        handler = ProxyOptionHandler.class)
        MapperMode mapperMode = MapperMode.STANDARD;
        protected MapperModeOp mapperModeOp = (MapperModeOp) MapperMode.STANDARD.getOptions();

        private ClusterTypeOp clusterTypeOp;

        private Class<? extends SpatialClusters<?>> clusterClass;

        @Override
        public String getInputFileString() {
                return input;
        }

        @Override
        public String getOutputFileString() {
                return output;
        }

        @Override
        public void validate() throws CmdLineException {

                if (infoFile != null) {
                        info_mode = true;
                        try {
                                this.clusterTypeOp = sniffClusterType(infoFile);
                                if (this.clusterTypeOp == null)
                                        throw new CmdLineException(null, "Could not identify the clustertype");

                                this.clusterClass = this.clusterTypeOp.getClusterClass();
                        } catch (final IOException e) {
                                throw new CmdLineException(null, "Could not identify the clustertype. File: " + infoFile, e);
                        }

                }
                if (quantLocation != null) {
                        if (info_mode)
                                throw new CmdLineException(null,
                                                "--quant and --info are mutually exclusive.");
                        quant_mode = true;
                        try {
                                this.clusterTypeOp = sniffClusterType(quantLocation);
                                if (this.clusterTypeOp == null)
                                        throw new CmdLineException(null, "Could not identify the clustertype");

                                this.clusterClass = this.clusterTypeOp.getClusterClass();
                        } catch (final Exception e) {
                                e.printStackTrace();
                                throw new CmdLineException(null, "Could not identify the clustertype. File: " + quantLocation, e);
                        }
                }

                if (this.getCountMode()) {
                        if (this.extension.equals(".loc"))
                                this.extension = ".counts";
                }
                if (forceRM && this.beforeMaps) {

                        try {
                                final URI outuri = SequenceFileUtility.convertToURI(this.output);
                                final FileSystem fs = getFileSystem(outuri);
                                fs.delete(new Path(outuri.toString()), true);
                        } catch (final IOException e) {

                        }
                }
        }

        public static FileSystem getFileSystem(URI uri) throws IOException {
                final Configuration config = new Configuration();
                FileSystem fs = FileSystem.get(uri, config);
                if (fs instanceof LocalFileSystem)
                        fs = ((LocalFileSystem) fs).getRaw();
                return fs;
        }

        public static ClusterTypeOp sniffClusterType(String quantFile) throws IOException {
                InputStream fios = null;
                try {
                        fios = getClusterInputStream(quantFile);
                        return ClusterType.sniffClusterType(new BufferedInputStream(fios));
                } finally {
                        if (fios != null)
                                try {
                                        fios.close();
                                } catch (final IOException e) { /* don't care */
                                }
                }
        }

        @Override
        public ClusterTypeOp getClusterType() {
                return this.clusterTypeOp;
        }

        public static InputStream getClusterInputStream(String uriStr) throws IOException {
                final URI uri = SequenceFileUtility.convertToURI(uriStr);
                final FileSystem fs = getFileSystem(uri);
                final Path p = new Path(uri.toString());
                return fs.open(p);
        }

        public InputStream getClusterInputStream() throws IOException {
                return getClusterInputStream(this.quantLocation);
        }

        public String getClusterInputString() {
                return this.quantLocation;
        }

        public Path[] getInputPaths() throws IOException {
                final Path[] sequenceFiles = SequenceFileUtility.getFilePaths(this.getInputFileString(), "part");
                return sequenceFiles;
        }

        @Override
        public ClusterTypeOp getOtherInfoType() {
                return null;
        }

        @Override
        public Class<? extends SpatialClusters<?>> getClusterClass() {
                return this.clusterClass;
        }

        @Override
        public Class<SpatialClusters<?>> getOtherInfoClass() {
                return null;
        }
}