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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal;

import com.gemstone.gemfire.internal.i18n.LocalizedStrings;

import java.io.*;
import java.util.*;

/**
 * This program sorts the entries in a GemFire log file (one written using
 * a {@link com.gemstone.gemfire.i18n.LogWriterI18n}) by their timestamps.
 * Note that in order to do so, we have to read the entire file into
 * memory.
 *
 * @see MergeLogFiles
 * @see LogFileParser
 *
 * @author David Whitlock
 *
 * @since 3.0
 */
public class SortLogFile {

  private static PrintStream out = System.out;
  private static PrintStream err = System.err;

  /**
   * Parses a log file from a given source and writes the sorted
   * entries to a given destination.
   */
  public static void sortLogFile(InputStream logFile, 
                                 PrintWriter sortedFile)
    throws IOException {

    SortedSet sorted = new TreeSet(new Comparator() {
        public int compare(Object o1, Object o2) {
          LogFileParser.LogEntry entry1 =
            (LogFileParser.LogEntry) o1;
          LogFileParser.LogEntry entry2 =
            (LogFileParser.LogEntry) o2;
          String stamp1 = entry1.getTimestamp();
          String stamp2 = entry2.getTimestamp();

          if (stamp1.equals(stamp2)) {
            if (entry1.getContents().equals(entry2.getContents())) {
              // Timestamps and contents are both equal - compare hashCode()
              return Integer.valueOf(entry1.hashCode()).compareTo(
                     Integer.valueOf(entry2.hashCode()));
            } else {
              return entry1.getContents().compareTo(entry2.getContents());
            }
          } else {
            return stamp1.compareTo(stamp2);
          }
        }
      });

    BufferedReader br =
      new BufferedReader(new InputStreamReader(logFile));
    LogFileParser parser = new LogFileParser(null, br);
    while (parser.hasMoreEntries()) {
      sorted.add(parser.getNextEntry());
    }

    for (Iterator iter = sorted.iterator(); iter.hasNext(); ) {
      LogFileParser.LogEntry entry =
        (LogFileParser.LogEntry) iter.next();
      entry.writeTo(sortedFile);
    }
  }

    ////////////////////  Main Program  ////////////////////

  /**
   * Prints usage information about this program
   */
  private static void usage(String s) {
    err.println("\n** " + s + "\n");
    err.println(LocalizedStrings.SortLogFile_USAGE.toLocalizedString() + ": java SortLogFile logFile");
    err.println("-sortedFile file " + LocalizedStrings.SortLogFile_FILE_IN_WHICH_TO_PUT_SORTED_LOG.toLocalizedString());
    err.println("");
    err.println(LocalizedStrings.SortLogFile_SORTS_A_GEMFIRE_LOG_FILE_BY_TIMESTAMP_THE_MERGED_LOG_FILE_IS_WRITTEN_TO_SYSTEM_OUT_OR_A_FILE.toLocalizedString());
    err.println("");
    System.exit(1);
  }

  public static void main(String[] args) throws IOException {
    File logFile = null;
    File sortedFile = null;
//    int dirCount = 0;
    
    for (int i = 0; i < args.length; i++) {
      if (args[i].equals("-sortedFile")) {
        if (++i >= args.length) {
          usage("Missing sorted file name");
        }

        sortedFile = new File(args[i]);

      } else if (logFile == null) {
        File file = new File(args[i]);
        if (!file.exists()) {
          usage(LocalizedStrings.SortLogFile_FILE_0_DOES_NOT_EXIST.toLocalizedString(file));
        }

        logFile = file;

      } else {
        usage(LocalizedStrings.SortLogFile_EXTRANEOUS_COMMAND_LINE_0.toLocalizedString(args[i]));
      }
    }

    if (logFile == null) {
      usage(LocalizedStrings.SortLogFile_MISSING_FILENAME.toLocalizedString());
    }

    InputStream logFileStream = new FileInputStream(logFile);
    
    PrintStream ps;
    if (sortedFile != null) {
      ps = new PrintStream(new FileOutputStream(sortedFile), true);

    } else {
      ps = out;
    }

    PrintWriter pw = new PrintWriter(ps, true);

    sortLogFile(logFileStream, pw);

    System.exit(0);             // In case we're running JProbe
  }

}