/*
 * 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.geode.management.internal.cli.util;

import java.io.File;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FilenameFilter;
import java.io.InputStream;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;

import org.apache.geode.internal.logging.MergeLogFiles;
import org.apache.geode.management.internal.cli.i18n.CliStrings;

/**
 * 
 * @since GemFire 7.0
 */

public class MergeLogs {
  /**
   * @param args
   */

  public static void main(String[] args) {
    if (args.length < 1 || args.length > 1) {
      throw new IllegalArgumentException("Requires only 1  arguments : <targetDirName>");
    }
    try {
      String result = mergeLogFile(args[0]);
      System.out.println(result);
    } catch (Exception e) {
      System.out.println(e.getMessage());
    }


  }

  static String mergeLogFile(String dirName) throws Exception {
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
    File dir = new File(dirName);
    String[] logsToMerge = dir.list();
    InputStream[] logFiles = new FileInputStream[logsToMerge.length];
    String[] logFileNames = new String[logFiles.length];
    for (int i = 0; i < logsToMerge.length; i++) {
      try {
        logFiles[i] = new FileInputStream(dirName + File.separator + logsToMerge[i]);
        logFileNames[i] = dirName + File.separator + logsToMerge[i];
      } catch (FileNotFoundException e) {
        throw new Exception(
            logsToMerge[i] + " " + CliStrings.EXPORT_LOGS__MSG__FILE_DOES_NOT_EXIST);
      }
    }

    PrintWriter mergedLog = null;
    try {
      String mergeLog =
          dirName + File.separator + "merge_" + sdf.format(new java.util.Date()) + ".log";
      mergedLog = new PrintWriter(mergeLog);
      boolean flag = MergeLogFiles.mergeLogFiles(logFiles, logFileNames, mergedLog);
    } catch (FileNotFoundException e) {
      throw new Exception(
          "FileNotFoundException in creating PrintWriter in MergeLogFiles" + e.getMessage());
    } catch (Exception e) {
      throw new Exception("Exception in creating PrintWriter in MergeLogFiles" + e.getMessage());
    }

    return "Sucessfully merged logs";
  }


}