using Lucene.Net.Index;
using Lucene.Net.Store;
using Lucene.Net.Util;
using System;

namespace Lucene.Net.Misc
{
    /*
	 * 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.
	 */

    /// <summary>
    /// Merges indices specified on the command line into the index
    /// specified as the first command line argument.
    /// </summary>
    public class IndexMergeTool
    {
        public static void Main(string[] args)
        {
            if (args.Length < 3)
            {
                Console.Error.WriteLine("Usage: IndexMergeTool <mergedIndex> <index1> <index2> [index3] ...");
                Environment.Exit(1);
            }
            FSDirectory mergedIndex = FSDirectory.Open(new System.IO.DirectoryInfo(args[0]));

            using (IndexWriter writer = new IndexWriter(mergedIndex, 
#pragma warning disable 612, 618                
                new IndexWriterConfig(LuceneVersion.LUCENE_CURRENT, null)
#pragma warning restore 612, 618
                { OpenMode = OpenMode.CREATE }))
            {

                Directory[] indexes = new Directory[args.Length - 1];
                for (int i = 1; i < args.Length; i++)
                {
                    indexes[i - 1] = FSDirectory.Open(new System.IO.DirectoryInfo(args[i]));
                }

                Console.WriteLine("Merging...");
                writer.AddIndexes(indexes);

                Console.WriteLine("Full merge...");
                writer.ForceMerge(1);
            }
            Console.WriteLine("Done.");
        }
    }
}