/*
    * 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.logging.log4j.core.appender.rolling;
  
  import java.util.concurrent.ThreadLocalRandom;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.logging.log4j.core.Core;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
  import org.apache.logging.log4j.core.config.plugins.PluginBuilderAttribute;
  import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
  import org.apache.logging.log4j.core.util.Integers;
  
  /**
   * Rolls a file over based on time.
   */
  @Plugin(name = "TimeBasedTriggeringPolicy", category = Core.CATEGORY_NAME, printObject = true)
  public final class TimeBasedTriggeringPolicy extends AbstractTriggeringPolicy {
  
  
      public static class Builder implements org.apache.logging.log4j.core.util.Builder<TimeBasedTriggeringPolicy> {
  
          @PluginBuilderAttribute
          private int interval = 1;
  
          @PluginBuilderAttribute
          private boolean modulate = false;
  
          @PluginBuilderAttribute
          private int maxRandomDelay = 0;
  
          @Override
          public TimeBasedTriggeringPolicy build() {
              final long maxRandomDelayMillis = TimeUnit.SECONDS.toMillis(maxRandomDelay);
              return new TimeBasedTriggeringPolicy(interval, modulate, maxRandomDelayMillis);
          }
  
          public int getInterval() {
              return interval;
          }
  
          public boolean isModulate() {
              return modulate;
          }
  
          public int getMaxRandomDelay() {
              return maxRandomDelay;
          }
  
          public Builder withInterval(final int interval){
              this.interval = interval;
              return this;
          }
  
          public Builder withModulate(final boolean modulate){
              this.modulate = modulate;
              return this;
          }
  
          public Builder withMaxRandomDelay(final int maxRandomDelay){
              this.maxRandomDelay = maxRandomDelay;
              return this;
          }
  
      }
  
      private long nextRolloverMillis;
      private final int interval;
      private final boolean modulate;
      private final long maxRandomDelayMillis;
  
      private RollingFileManager manager;
  
      private TimeBasedTriggeringPolicy(final int interval, final boolean modulate, final long maxRandomDelayMillis) {
          this.interval = interval;
          this.modulate = modulate;
          this.maxRandomDelayMillis = maxRandomDelayMillis;
      }
  
      public int getInterval() {
          return interval;
      }
  
     public long getNextRolloverMillis() {
         return nextRolloverMillis;
     }
 
     /**
      * Initializes the policy.
      * @param aManager The RollingFileManager.
      */
     @Override
     public void initialize(final RollingFileManager aManager) {
         this.manager = aManager;
         long current = aManager.getFileTime();
         if (current == 0) {
             current = System.currentTimeMillis();
         }
 
         // LOG4J2-531: call getNextTime twice to force initialization of both prevFileTime and nextFileTime
         aManager.getPatternProcessor().getNextTime(current, interval, modulate);
         aManager.getPatternProcessor().setTimeBased(true);
 
         nextRolloverMillis = ThreadLocalRandom.current().nextLong(0, 1 + maxRandomDelayMillis)
                 + aManager.getPatternProcessor().getNextTime(current, interval, modulate);
     }
 
     /**
      * Determines whether a rollover should occur.
      * @param event   A reference to the currently event.
      * @return true if a rollover should occur.
      */
     @Override
     public boolean isTriggeringEvent(final LogEvent event) {
         final long nowMillis = event.getTimeMillis();
         if (nowMillis >= nextRolloverMillis) {
             nextRolloverMillis = ThreadLocalRandom.current().nextLong(0, 1 + maxRandomDelayMillis)
                     + manager.getPatternProcessor().getNextTime(nowMillis, interval, modulate);
             manager.getPatternProcessor().setCurrentFileTime(System.currentTimeMillis());
             return true;
         }
         return false;
     }
 
     /**
      * Creates a TimeBasedTriggeringPolicy.
      * @param interval The interval between rollovers.
      * @param modulate If true the time will be rounded to occur on a boundary aligned with the increment.
      * @return a TimeBasedTriggeringPolicy.
      * @deprecated Use {@link #newBuilder()}.
      */
     @Deprecated
     public static TimeBasedTriggeringPolicy createPolicy(
             @PluginAttribute("interval") final String interval,
             @PluginAttribute("modulate") final String modulate) {
         return newBuilder()
                 .withInterval(Integers.parseInt(interval, 1))
                 .withModulate(Boolean.parseBoolean(modulate))
                 .build();
     }
 
     @PluginBuilderFactory
     public static TimeBasedTriggeringPolicy.Builder newBuilder() {
         return new Builder();
     }
 
     @Override
     public String toString() {
         return "TimeBasedTriggeringPolicy(nextRolloverMillis=" + nextRolloverMillis + ", interval=" + interval
                 + ", modulate=" + modulate + ")";
     }
 
 }