/*
    * 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.maven.slf4j;
  
  import java.io.PrintStream;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  
  import org.slf4j.Logger;
  import org.slf4j.Marker;
  import org.slf4j.event.Level;
  import org.slf4j.event.LoggingEvent;
  import org.slf4j.helpers.LegacyAbstractLogger;
  import org.slf4j.helpers.MessageFormatter;
  import org.slf4j.helpers.NormalizedParameters;
  import org.slf4j.spi.LocationAwareLogger;
  
  /**
   * <p>
   * Simple implementation of {@link Logger} that sends all enabled log messages,
   * for all defined loggers, to the console ({@code System.err}). The following
   * system properties are supported to configure the behavior of this logger:
   *
   *
   * <ul>
   * <li><code>org.slf4j.simpleLogger.logFile</code> - The output target which can
   * be the <em>path</em> to a file, or the special values "System.out" and
   * "System.err". Default is "System.err".</li>
   *
   * <li><code>org.slf4j.simpleLogger.cacheOutputStream</code> - If the output
   * target is set to "System.out" or "System.err" (see preceding entry), by
   * default, logs will be output to the latest value referenced by
   * <code>System.out/err</code> variables. By setting this parameter to true, the
   * output stream will be cached, i.e. assigned once at initialization time and
   * re-used independently of the current value referenced by
   * <code>System.out/err</code>.</li>
   *
   * <li><code>org.slf4j.simpleLogger.defaultLogLevel</code> - Default log level
   * for all instances of SimpleLogger. Must be one of ("trace", "debug", "info",
   * "warn", "error" or "off"). If not specified, defaults to "info".</li>
   *
   * <li><code>org.slf4j.simpleLogger.log.<em>a.b.c</em></code> - Logging detail
   * level for a SimpleLogger instance named "a.b.c". Right-side value must be one
   * of "trace", "debug", "info", "warn", "error" or "off". When a SimpleLogger
   * named "a.b.c" is initialized, its level is assigned from this property. If
   * unspecified, the level of nearest parent logger will be used, and if none is
   * set, then the value specified by
   * <code>org.slf4j.simpleLogger.defaultLogLevel</code> will be used.</li>
   *
   * <li><code>org.slf4j.simpleLogger.showDateTime</code> - Set to
   * <code>true</code> if you want the current date and time to be included in
   * output messages. Default is <code>false</code></li>
   *
   * <li><code>org.slf4j.simpleLogger.dateTimeFormat</code> - The date and time
   * format to be used in the output messages. The pattern describing the date and
   * time format is defined by <a href=
   * "http://docs.oracle.com/javase/1.5.0/docs/api/java/text/SimpleDateFormat.html">
   * <code>SimpleDateFormat</code></a>. If the format is not specified or is
   * invalid, the number of milliseconds since start up will be output.</li>
   *
   * <li><code>org.slf4j.simpleLogger.showThreadName</code> -Set to
   * <code>true</code> if you want to output the current thread name. Defaults to
   * <code>true</code>.</li>
   *
   * <li>(since version 1.7.33 and 2.0.0-alpha6) <code>org.slf4j.simpleLogger.showThreadId</code> -
   * If you would like to output the current thread id, then set to
   * <code>true</code>. Defaults to <code>false</code>.</li>
   *
   * <li><code>org.slf4j.simpleLogger.showLogName</code> - Set to
   * <code>true</code> if you want the Logger instance name to be included in
   * output messages. Defaults to <code>true</code>.</li>
   *
   * <li><code>org.slf4j.simpleLogger.showShortLogName</code> - Set to
   * <code>true</code> if you want the last component of the name to be included
   * in output messages. Defaults to <code>false</code>.</li>
   *
   * <li><code>org.slf4j.simpleLogger.levelInBrackets</code> - Should the level
   * string be output in brackets? Defaults to <code>false</code>.</li>
   *
   * <li><code>org.slf4j.simpleLogger.warnLevelString</code> - The string value
   * output for the warn level. Defaults to <code>WARN</code>.</li>
   *
  * </ul>
  *
  * <p>
  * In addition to looking for system properties with the names specified above,
  * this implementation also checks for a class loader resource named
  * <code>"simplelogger.properties"</code>, and includes any matching definitions
  * from this resource (if it exists).
  *
  *
  * <p>
  * With no configuration, the default output includes the relative time in
  * milliseconds, thread name, the level, logger name, and the message followed
  * by the line separator for the host. In log4j terms it amounts to the "%r [%t]
  * %level %logger - %m%n" pattern.
  *
  * <p>
  * Sample output follows.
  *
  *
  * <pre>
  * 176 [main] INFO examples.Sort - Populating an array of 2 elements in reverse order.
  * 225 [main] INFO examples.SortAlgo - Entered the sort method.
  * 304 [main] INFO examples.SortAlgo - Dump of integer array:
  * 317 [main] INFO examples.SortAlgo - Element [0] = 0
  * 331 [main] INFO examples.SortAlgo - Element [1] = 1
  * 343 [main] INFO examples.Sort - The next log statement should be an error message.
  * 346 [main] ERROR examples.SortAlgo - Tried to dump an uninitialized array.
  *   at org.log4j.examples.SortAlgo.dump(SortAlgo.java:58)
  *   at org.log4j.examples.Sort.main(Sort.java:64)
  * 467 [main] INFO  examples.Sort - Exiting main method.
  * </pre>
  *
  * <p>
  * This implementation is heavily inspired by
  * <a href="http://commons.apache.org/logging/">Apache Commons Logging</a>'s
  * SimpleLog.
  *
  *
  * @author Ceki G&uuml;lc&uuml;
  * @author Scott Sanders
  * @author Rod Waldhoff
  * @author Robert Burrell Donkin
  * @author C&eacute;drik LIME
  */
 public class MavenBaseLogger extends LegacyAbstractLogger {
 
     private static final long serialVersionUID = -632788891211436180L;
 
     private static final long START_TIME = System.currentTimeMillis();
 
     protected static final int LOG_LEVEL_TRACE = LocationAwareLogger.TRACE_INT;
     protected static final int LOG_LEVEL_DEBUG = LocationAwareLogger.DEBUG_INT;
     protected static final int LOG_LEVEL_INFO = LocationAwareLogger.INFO_INT;
     protected static final int LOG_LEVEL_WARN = LocationAwareLogger.WARN_INT;
     protected static final int LOG_LEVEL_ERROR = LocationAwareLogger.ERROR_INT;
 
     static final char SP = ' ';
     static final String TID_PREFIX = "tid=";
 
     // The OFF level can only be used in configuration files to disable logging.
     // It has
     // no printing method associated with it in o.s.Logger interface.
     protected static final int LOG_LEVEL_OFF = LOG_LEVEL_ERROR + 10;
 
     static final SimpleLoggerConfiguration CONFIG_PARAMS = new SimpleLoggerConfiguration();
 
     private static boolean initialized = false;
 
     static void lazyInit() {
         if (initialized) {
             return;
         }
         initialized = true;
         init();
     }
 
     // external software might be invoking this method directly. Do not rename
     // or change its semantics.
     static void init() {
         CONFIG_PARAMS.init();
     }
 
     /** The current log level */
     protected int currentLogLevel = LOG_LEVEL_INFO;
     /** The short name of this simple log instance */
     private transient String shortLogName = null;
 
     /**
      * All system properties used by <code>SimpleLogger</code> start with this
      * prefix
      */
     public static final String SYSTEM_PREFIX = "org.slf4j.simpleLogger.";
 
     public static final String LOG_KEY_PREFIX = MavenBaseLogger.SYSTEM_PREFIX + "log.";
 
     public static final String CACHE_OUTPUT_STREAM_STRING_KEY = MavenBaseLogger.SYSTEM_PREFIX + "cacheOutputStream";
 
     public static final String WARN_LEVEL_STRING_KEY = MavenBaseLogger.SYSTEM_PREFIX + "warnLevelString";
 
     public static final String LEVEL_IN_BRACKETS_KEY = MavenBaseLogger.SYSTEM_PREFIX + "levelInBrackets";
 
     public static final String LOG_FILE_KEY = MavenBaseLogger.SYSTEM_PREFIX + "logFile";
 
     public static final String SHOW_SHORT_LOG_NAME_KEY = MavenBaseLogger.SYSTEM_PREFIX + "showShortLogName";
 
     public static final String SHOW_LOG_NAME_KEY = MavenBaseLogger.SYSTEM_PREFIX + "showLogName";
 
     public static final String SHOW_THREAD_NAME_KEY = MavenBaseLogger.SYSTEM_PREFIX + "showThreadName";
 
     public static final String SHOW_THREAD_ID_KEY = MavenBaseLogger.SYSTEM_PREFIX + "showThreadId";
 
     public static final String DATE_TIME_FORMAT_KEY = MavenBaseLogger.SYSTEM_PREFIX + "dateTimeFormat";
 
     public static final String SHOW_DATE_TIME_KEY = MavenBaseLogger.SYSTEM_PREFIX + "showDateTime";
 
     public static final String DEFAULT_LOG_LEVEL_KEY = MavenBaseLogger.SYSTEM_PREFIX + "defaultLogLevel";
 
     /**
      * Protected access allows only {@link MavenLoggerFactory} and also derived classes to instantiate
      * MavenLoggerFactory instances.
      */
     protected MavenBaseLogger(String name) {
         this.name = name;
 
         String levelString = recursivelyComputeLevelString();
         if (levelString != null) {
             this.currentLogLevel = SimpleLoggerConfiguration.stringToLevel(levelString);
         } else {
             this.currentLogLevel = CONFIG_PARAMS.defaultLogLevel;
         }
     }
 
     String recursivelyComputeLevelString() {
         String tempName = name;
         String levelString = null;
         int indexOfLastDot = tempName.length();
         while ((levelString == null) && (indexOfLastDot > -1)) {
             tempName = tempName.substring(0, indexOfLastDot);
             levelString = CONFIG_PARAMS.getStringProperty(MavenBaseLogger.LOG_KEY_PREFIX + tempName, null);
             indexOfLastDot = String.valueOf(tempName).lastIndexOf(".");
         }
         return levelString;
     }
 
     /**
      * To avoid intermingling of log messages and associated stack traces, the two
      * operations are done in a synchronized block.
      *
      * @param buf
      * @param t
      */
     protected void write(StringBuilder buf, Throwable t) {
         PrintStream targetStream = CONFIG_PARAMS.outputChoice.getTargetPrintStream();
 
         synchronized (CONFIG_PARAMS) {
             targetStream.println(buf.toString());
             writeThrowable(t, targetStream);
             targetStream.flush();
         }
     }
 
     protected void writeThrowable(Throwable t, PrintStream targetStream) {
         if (t != null) {
             t.printStackTrace(targetStream);
         }
     }
 
     protected String getFormattedDate() {
         Date now = new Date();
         String dateText;
         synchronized (CONFIG_PARAMS.dateFormatter) {
             dateText = CONFIG_PARAMS.dateFormatter.format(now);
         }
         return dateText;
     }
 
     protected String computeShortName() {
         return name.substring(name.lastIndexOf(".") + 1);
     }
 
     // /**
     // * For formatted messages, first substitute arguments and then log.
     // *
     // * @param level
     // * @param format
     // * @param arg1
     // * @param arg2
     // */
     // private void formatAndLog(int level, String format, Object arg1, Object arg2) {
     // if (!isLevelEnabled(level)) {
     // return;
     // }
     // FormattingTuple tp = MessageFormatter.format(format, arg1, arg2);
     // log(level, tp.getMessage(), tp.getThrowable());
     // }
 
     // /**
     // * For formatted messages, first substitute arguments and then log.
     // *
     // * @param level
     // * @param format
     // * @param arguments
     // * a list of 3 ore more arguments
     // */
     // private void formatAndLog(int level, String format, Object... arguments) {
     // if (!isLevelEnabled(level)) {
     // return;
     // }
     // FormattingTuple tp = MessageFormatter.arrayFormat(format, arguments);
     // log(level, tp.getMessage(), tp.getThrowable());
     // }
 
     /**
      * Is the given log level currently enabled?
      *
      * @param logLevel is this level enabled?
      * @return whether the logger is enabled for the given level
      */
     protected boolean isLevelEnabled(int logLevel) {
         // log level are numerically ordered so can use simple numeric
         // comparison
         return (logLevel >= currentLogLevel);
     }
 
     /** Are {@code trace} messages currently enabled? */
     public boolean isTraceEnabled() {
         return isLevelEnabled(LOG_LEVEL_TRACE);
     }
 
     /** Are {@code debug} messages currently enabled? */
     public boolean isDebugEnabled() {
         return isLevelEnabled(LOG_LEVEL_DEBUG);
     }
 
     /** Are {@code info} messages currently enabled? */
     public boolean isInfoEnabled() {
         return isLevelEnabled(LOG_LEVEL_INFO);
     }
 
     /** Are {@code warn} messages currently enabled? */
     public boolean isWarnEnabled() {
         return isLevelEnabled(LOG_LEVEL_WARN);
     }
 
     /** Are {@code error} messages currently enabled? */
     public boolean isErrorEnabled() {
         return isLevelEnabled(LOG_LEVEL_ERROR);
     }
 
     /**
      * SimpleLogger's implementation of
      * {@link org.slf4j.helpers.AbstractLogger#handleNormalizedLoggingCall(Level, Marker, String, Object[], Throwable) AbstractLogger#handleNormalizedLoggingCall}
      * }
      *
      * @param level the SLF4J level for this event
      * @param marker  The marker to be used for this event, may be null.
      * @param messagePattern The message pattern which will be parsed and formatted
      * @param arguments  the array of arguments to be formatted, may be null
      * @param throwable  The exception whose stack trace should be logged, may be null
      */
     @Override
     protected void handleNormalizedLoggingCall(
             Level level, Marker marker, String messagePattern, Object[] arguments, Throwable throwable) {
 
         List<Marker> markers = null;
 
         if (marker != null) {
             markers = new ArrayList<>();
             markers.add(marker);
         }
 
         innerHandleNormalizedLoggingCall(level, markers, messagePattern, arguments, throwable);
     }
 
     private void innerHandleNormalizedLoggingCall(
             Level level, List<Marker> markers, String messagePattern, Object[] arguments, Throwable t) {
 
         StringBuilder buf = new StringBuilder(32);
 
         // Append date-time if so configured
         if (CONFIG_PARAMS.showDateTime) {
             if (CONFIG_PARAMS.dateFormatter != null) {
                 buf.append(getFormattedDate());
                 buf.append(SP);
             } else {
                 buf.append(System.currentTimeMillis() - START_TIME);
                 buf.append(SP);
             }
         }
 
         // Append current thread name if so configured
         if (CONFIG_PARAMS.showThreadName) {
             buf.append('[');
             buf.append(Thread.currentThread().getName());
             buf.append("] ");
         }
 
         if (CONFIG_PARAMS.showThreadId) {
             buf.append(TID_PREFIX);
             buf.append(Thread.currentThread().getId());
             buf.append(SP);
         }
 
         if (CONFIG_PARAMS.levelInBrackets) {
             buf.append('[');
         }
 
         // Append a readable representation of the log level
         String levelStr = renderLevel(level.toInt());
         buf.append(levelStr);
         if (CONFIG_PARAMS.levelInBrackets) {
             buf.append(']');
         }
         buf.append(SP);
 
         // Append the name of the log instance if so configured
         if (CONFIG_PARAMS.showShortLogName) {
             if (shortLogName == null) {
                 shortLogName = computeShortName();
             }
             buf.append(shortLogName).append(" - ");
         } else if (CONFIG_PARAMS.showLogName) {
             buf.append(name).append(" - ");
         }
 
         if (markers != null) {
             buf.append(SP);
             for (Marker marker : markers) {
                 buf.append(marker.getName()).append(SP);
             }
         }
 
         String formattedMessage = MessageFormatter.basicArrayFormat(messagePattern, arguments);
 
         // Append the message
         buf.append(formattedMessage);
 
         write(buf, t);
     }
 
     protected String renderLevel(int levelInt) {
         switch (levelInt) {
             case LOG_LEVEL_TRACE:
                 return "TRACE";
             case LOG_LEVEL_DEBUG:
                 return ("DEBUG");
             case LOG_LEVEL_INFO:
                 return "INFO";
             case LOG_LEVEL_WARN:
                 return "WARN";
             case LOG_LEVEL_ERROR:
                 return "ERROR";
             default:
                 throw new IllegalStateException("Unrecognized level [" + levelInt + "]");
         }
     }
 
     public void log(LoggingEvent event) {
         int levelInt = event.getLevel().toInt();
 
         if (!isLevelEnabled(levelInt)) {
             return;
         }
 
         NormalizedParameters np = NormalizedParameters.normalize(event);
 
         innerHandleNormalizedLoggingCall(
                 event.getLevel(), event.getMarkers(), np.getMessage(), np.getArguments(), event.getThrowable());
     }
 
     @Override
     protected String getFullyQualifiedCallerName() {
         return null;
     }
 }