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* 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.
*/
package org.apache.cassandra.io;

import java.io.File;
import java.io.IOException;

import java.util.Map;
import java.util.SortedMap;
import java.util.Set;
import java.util.TreeMap;

import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.Column;
import org.apache.cassandra.db.ColumnFamily;
import org.apache.cassandra.db.Table;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.io.util.DataOutputBuffer;

/**
 * TODO: These methods imitate Memtable.writeSortedKeys to some degree, but
 * because it is so monolithic, we can't reuse much.
 */
public class SSTableUtils
{
    // first configured table and cf
    public static String TABLENAME;
    public static String CFNAME;
    static
    {
        try
        {
            TABLENAME = DatabaseDescriptor.getTables().iterator().next();
            CFNAME = Table.open(TABLENAME).getColumnFamilies().iterator().next();
        }
        catch(IOException e)
        {
            throw new RuntimeException(e);
        }
    }

    public static File tempSSTableFile(String tablename, String cfname) throws IOException
    {
        File tempdir = File.createTempFile(tablename, cfname);
        if(!tempdir.delete() || !tempdir.mkdir())
            throw new IOException("Temporary directory creation failed.");
        tempdir.deleteOnExit();
        File tabledir = new File(tempdir, tablename);
        tabledir.mkdir();
        tabledir.deleteOnExit();
        return File.createTempFile(cfname + "-",
                                   "-" + SSTable.TEMPFILE_MARKER + "-Data.db",
                                   tabledir);
    }

    public static SSTableReader writeSSTable(Set<String> keys) throws IOException
    {
        TreeMap<String, ColumnFamily> map = new TreeMap<String, ColumnFamily>();
        for (String key : keys)
        {
            ColumnFamily cf = ColumnFamily.create(TABLENAME, CFNAME);
            cf.addColumn(new Column(key.getBytes(), key.getBytes(), 0));
            map.put(key, cf);
        }
        return writeSSTable(map);
    }

    public static SSTableReader writeSSTable(SortedMap<String, ColumnFamily> entries) throws IOException
    {
        TreeMap<String, byte[]> map = new TreeMap<String, byte[]>();
        for (Map.Entry<String, ColumnFamily> entry : entries.entrySet())
        {
            DataOutputBuffer buffer = new DataOutputBuffer();
            ColumnFamily.serializer().serializeWithIndexes(entry.getValue(), buffer, false);
            map.put(entry.getKey(), buffer.getData());
        }
        return writeRawSSTable(TABLENAME, CFNAME, map);
    }

    public static SSTableReader writeRawSSTable(String tablename, String cfname, SortedMap<String, byte[]> entries) throws IOException
    {
        File f = tempSSTableFile(tablename, cfname);
        SSTableWriter writer = new SSTableWriter(f.getAbsolutePath(), entries.size(), entries.size()*10, StorageService.getPartitioner());

        assert !writer.getBloomFilterWriter().isBloomColumns();
        
        for (Map.Entry<String, byte[]> entry : entries.entrySet())
            writer.append(writer.partitioner.decorateKey(entry.getKey()),
                          entry.getValue());
        new File(writer.indexFilename()).deleteOnExit();
        new File(writer.filterFilename()).deleteOnExit();
        return writer.closeAndOpenReader();
    }
}