/*
    * 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.action;
  
  import java.nio.file.Path;
  import java.nio.file.attribute.BasicFileAttributes;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.logging.log4j.Logger;
  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.PluginElement;
  import org.apache.logging.log4j.core.config.plugins.PluginFactory;
  import org.apache.logging.log4j.status.StatusLogger;
  
  /**
   * PathCondition that accepts paths after some count threshold is exceeded during the file tree walk.
   */
  @Plugin(name = "IfAccumulatedFileCount", category = "Core", printObject = true)
  public final class IfAccumulatedFileCount implements PathCondition {
      private static final Logger LOGGER = StatusLogger.getLogger();
      private final int threshold;
      private int count;
      private final PathCondition[] nestedConditions;
  
      private IfAccumulatedFileCount(final int thresholdParam, final PathCondition[] nestedConditions) {
          if (thresholdParam <= 0) {
              throw new IllegalArgumentException("Count must be a positive integer but was " + thresholdParam);
          }
          this.threshold = thresholdParam;
          this.nestedConditions = nestedConditions == null ? new PathCondition[0] : Arrays.copyOf(nestedConditions,
                  nestedConditions.length);
      }
  
      public int getThresholdCount() {
          return threshold;
      }
  
      public List<PathCondition> getNestedConditions() {
          return Collections.unmodifiableList(Arrays.asList(nestedConditions));
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see org.apache.logging.log4j.core.appender.rolling.action.PathCondition#accept(java.nio.file.Path,
       * java.nio.file.Path, java.nio.file.attribute.BasicFileAttributes)
       */
      @Override
      public boolean accept(final Path basePath, final Path relativePath, final BasicFileAttributes attrs) {
          final boolean result = ++count > threshold;
          final String match = result ? ">" : "<=";
          final String accept = result ? "ACCEPTED" : "REJECTED";
          LOGGER.trace("IfAccumulatedFileCount {}: {} count '{}' {} threshold '{}'", accept, relativePath, count, match,
                  threshold);
          if (result) {
              return IfAll.accept(nestedConditions, basePath, relativePath, attrs);
          }
          return result;
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see org.apache.logging.log4j.core.appender.rolling.action.PathCondition#beforeFileTreeWalk()
       */
      @Override
      public void beforeFileTreeWalk() {
          count = 0;
          IfAll.beforeFileTreeWalk(nestedConditions);
      }
  
      /**
       * Create an IfAccumulatedFileCount condition.
       * 
       * @param threshold The threshold count from which files will be deleted.
       * @return An IfAccumulatedFileCount condition.
       */
      @PluginFactory
      public static IfAccumulatedFileCount createFileCountCondition( //
              // @formatter:off
              @PluginAttribute(value = "exceeds", defaultInt = Integer.MAX_VALUE) final int threshold,
              @PluginElement("PathConditions") final PathCondition... nestedConditions) {
             // @formatter:on
 
         if (threshold == Integer.MAX_VALUE) {
             LOGGER.error("IfAccumulatedFileCount invalid or missing threshold value.");
         }
         return new IfAccumulatedFileCount(threshold, nestedConditions);
     }
 
     @Override
     public String toString() {
         final String nested = nestedConditions.length == 0 ? "" : " AND " + Arrays.toString(nestedConditions);
         return "IfAccumulatedFileCount(exceeds=" + threshold + nested + ")";
     }
 }