/*
    * 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
    *
    *      https://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.commons.pool2.impl;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.lang.management.ManagementFactory;
  import java.time.Duration;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import javax.management.MBeanServer;
  import javax.management.ObjectName;
  
  import org.apache.commons.pool2.Waiter;
  import org.apache.commons.pool2.WaiterFactory;
  import org.apache.commons.pool2.impl.TestGenericObjectPool.SimpleFactory;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.Timeout;
  
  /**
   */
  class TestBaseGenericObjectPool {
  
      BaseGenericObjectPool<String> pool;
      SimpleFactory factory;
  
      @BeforeEach
      public void setUp() {
          factory = new SimpleFactory();
          pool = new GenericObjectPool<>(factory);
      }
  
      @AfterEach
      public void tearDown() {
          pool.close();
          pool = null;
          factory = null;
      }
  
      @Test
      void testActiveTimeStatistics() {
          for (int i = 0; i < 99; i++) { // must be < MEAN_TIMING_STATS_CACHE_SIZE
              pool.updateStatsReturn(Duration.ofMillis(i));
          }
          assertEquals(49, pool.getMeanActiveTimeMillis(), Double.MIN_VALUE);
      }
  
      @Test
      void testBorrowWaitStatistics() {
          final DefaultPooledObject<String> p = (DefaultPooledObject<String>) factory.makeObject();
          pool.updateStatsBorrow(p, Duration.ofMillis(10));
          pool.updateStatsBorrow(p, Duration.ofMillis(20));
          pool.updateStatsBorrow(p, Duration.ofMillis(20));
          pool.updateStatsBorrow(p, Duration.ofMillis(30));
          assertEquals(20, pool.getMeanBorrowWaitTimeMillis(), Double.MIN_VALUE);
          assertEquals(30, pool.getMaxBorrowWaitTimeMillis(), 0);
      }
  
      void testBorrowWaitStatisticsMax() {
          final DefaultPooledObject<String> p = (DefaultPooledObject<String>) factory.makeObject();
          assertEquals(0, pool.getMaxBorrowWaitTimeMillis(), Double.MIN_VALUE);
          pool.updateStatsBorrow(p, Duration.ZERO);
          assertEquals(0, pool.getMaxBorrowWaitTimeMillis(), Double.MIN_VALUE);
          pool.updateStatsBorrow(p, Duration.ofMillis(20));
          assertEquals(20, pool.getMaxBorrowWaitTimeMillis(), Double.MIN_VALUE);
          pool.updateStatsBorrow(p, Duration.ofMillis(20));
          assertEquals(20, pool.getMaxBorrowWaitTimeMillis(), Double.MIN_VALUE);
          pool.updateStatsBorrow(p, Duration.ofMillis(10));
          assertEquals(20, pool.getMaxBorrowWaitTimeMillis(), Double.MIN_VALUE);
      }
  
      @Test
      void testCollectDetailedStatisticsConfiguration() {
         // Test configuration through config object
         final GenericObjectPoolConfig<String> config = new GenericObjectPoolConfig<>();
         config.setCollectDetailedStatistics(false);
         try (GenericObjectPool<String> testPool = new GenericObjectPool<>(factory, config)) {
             assertFalse(testPool.getCollectDetailedStatistics());
         }
         // Test runtime configuration
         pool.setCollectDetailedStatistics(false);
         assertFalse(pool.getCollectDetailedStatistics());
         pool.setCollectDetailedStatistics(true);
         assertTrue(pool.getCollectDetailedStatistics());
     }
 
     @Test
     void testCollectDetailedStatisticsDefault() {
         // Test that collectDetailedStatistics defaults to true for backward compatibility
         assertTrue(pool.getCollectDetailedStatistics());
     }
 
     @Test
     void testCollectDetailedStatisticsDisabled() throws Exception {
         // Configure pool to disable detailed statistics
         pool.setCollectDetailedStatistics(false);
         final DefaultPooledObject<String> pooledObject = (DefaultPooledObject<String>) factory.makeObject();
         // Record initial values
         final long initialActiveTime = pool.getMeanActiveTimeMillis();
         final long initialIdleTime = pool.getMeanIdleDuration().toMillis();
         final long initialWaitTime = pool.getMeanBorrowWaitTimeMillis();
         final long initialMaxWaitTime = pool.getMaxBorrowWaitTimeMillis();
         // Update statistics - should be ignored for detailed stats
         pool.updateStatsBorrow(pooledObject, Duration.ofMillis(100));
         pool.updateStatsReturn(Duration.ofMillis(200));
         // Basic counters should still work
         assertEquals(1, pool.getBorrowedCount());
         assertEquals(1, pool.getReturnedCount());
         // Detailed statistics should remain unchanged
         assertEquals(initialActiveTime, pool.getMeanActiveTimeMillis());
         assertEquals(initialIdleTime, pool.getMeanIdleDuration().toMillis());
         assertEquals(initialWaitTime, pool.getMeanBorrowWaitTimeMillis());
         assertEquals(initialMaxWaitTime, pool.getMaxBorrowWaitTimeMillis());
     }
 
     @Test
     void testCollectDetailedStatisticsEnabled() throws Exception {
         // Ensure detailed statistics are enabled (default)
         pool.setCollectDetailedStatistics(true);
         final DefaultPooledObject<String> pooledObject = (DefaultPooledObject<String>) factory.makeObject();
         // Update statistics
         pool.updateStatsBorrow(pooledObject, Duration.ofMillis(100));
         pool.updateStatsReturn(Duration.ofMillis(200));
         // All counters should work
         assertEquals(1, pool.getBorrowedCount());
         assertEquals(1, pool.getReturnedCount());
         // Detailed statistics should be updated
         assertEquals(200, pool.getMeanActiveTimeMillis());
         assertEquals(100, pool.getMeanBorrowWaitTimeMillis());
         assertEquals(100, pool.getMaxBorrowWaitTimeMillis());
     }
 
     @Test
     void testCollectDetailedStatisticsToggling() throws Exception {
         final DefaultPooledObject<String> pooledObject = (DefaultPooledObject<String>) factory.makeObject();
         // Start with detailed stats enabled
         pool.setCollectDetailedStatistics(true);
         pool.updateStatsBorrow(pooledObject, Duration.ofMillis(50));
         pool.updateStatsReturn(Duration.ofMillis(100));
         assertEquals(50, pool.getMeanBorrowWaitTimeMillis());
         assertEquals(100, pool.getMeanActiveTimeMillis());
         // Disable detailed stats
         pool.setCollectDetailedStatistics(false);
         pool.updateStatsBorrow(pooledObject, Duration.ofMillis(200));
         pool.updateStatsReturn(Duration.ofMillis(300));
         // Detailed stats should remain at previous values
         assertEquals(50, pool.getMeanBorrowWaitTimeMillis());
         assertEquals(100, pool.getMeanActiveTimeMillis());
         // Basic counters should continue to increment
         assertEquals(2, pool.getBorrowedCount());
         assertEquals(2, pool.getReturnedCount());
     }
 
     @Test
     void testDetailedStatisticsConfigIntegration() {
         // Test that config property is properly applied during pool construction
         final GenericObjectPoolConfig<String> config = new GenericObjectPoolConfig<>();
         config.setCollectDetailedStatistics(false);
         try (GenericObjectPool<String> testPool = new GenericObjectPool<>(factory, config)) {
             assertFalse(testPool.getCollectDetailedStatistics(), "Pool should respect collectDetailedStatistics setting from config");
             // Test that toString includes the new property
             final String configString = config.toString();
             assertTrue(configString.contains("collectDetailedStatistics"), "Config toString should include collectDetailedStatistics property");
         }
     }
 
     @Test
     void testEvictionTimerMultiplePools() throws InterruptedException {
         final AtomicIntegerFactory factory = new AtomicIntegerFactory();
         factory.setValidateLatency(50);
         try (GenericObjectPool<AtomicInteger> evictingPool = new GenericObjectPool<>(factory)) {
             evictingPool.setTimeBetweenEvictionRuns(Duration.ofMillis(100));
             evictingPool.setNumTestsPerEvictionRun(5);
             evictingPool.setTestWhileIdle(true);
             evictingPool.setMinEvictableIdleTime(Duration.ofMillis(50));
             for (int i = 0; i < 10; i++) {
                 try {
                     evictingPool.addObject();
                 } catch (final Exception e) {
                     e.printStackTrace();
                 }
             }
 
             for (int i = 0; i < 1000; i++) {
                 try (GenericObjectPool<AtomicInteger> nonEvictingPool = new GenericObjectPool<>(factory)) {
                     // empty
                 }
             }
 
             Thread.sleep(1000);
             assertEquals(0, evictingPool.getNumIdle());
         }
     }
 
     /**
      * POOL-393
      * Tests JMX registration does not add too much latency to pool creation.
      */
     @SuppressWarnings("resource") // pools closed in finally block
     @Test
     @Timeout(value = 10_000, unit = TimeUnit.MILLISECONDS)
     void testJMXRegistrationLatency() {
         final int numPools = 1000;
         final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
         final ArrayList<GenericObjectPool<Waiter>> pools = new ArrayList<>();
         try {
             // final long startTime = System.currentTimeMillis();
             for (int i = 0; i < numPools; i++) {
                 pools.add(new GenericObjectPool<>(new WaiterFactory<>(0, 0, 0, 0, 0, 0), new GenericObjectPoolConfig<>()));
             }
             // System.out.println("Duration: " + (System.currentTimeMillis() - startTime));
             final ObjectName oname = pools.get(numPools - 1).getJmxName();
             assertEquals(1, mbs.queryNames(oname, null).size());
         } finally {
             pools.forEach(GenericObjectPool::close);
         }
     }
 
     @Test
     void testStatsStoreCircularBuffer() throws Exception {
         // Test that StatsStore properly handles circular buffer behavior
         final DefaultPooledObject<String> pooledObject = (DefaultPooledObject<String>) factory.makeObject();
         // Fill beyond the cache size (100) to test circular behavior
         final int cacheSize = 100; // BaseGenericObjectPool.MEAN_TIMING_STATS_CACHE_SIZE
         for (int i = 0; i < cacheSize + 50; i++) {
             pool.updateStatsBorrow(pooledObject, Duration.ofMillis(i));
             pool.updateStatsReturn(Duration.ofMillis(i * 2));
         }
         // Statistics should still be meaningful after circular buffer wrapping
         assertTrue(pool.getMeanActiveTimeMillis() > 0);
         assertTrue(pool.getMeanBorrowWaitTimeMillis() > 0);
         assertTrue(pool.getMaxBorrowWaitTimeMillis() > 0);
         // The mean should reflect recent values, not all historical values
         // (exact assertion depends on circular buffer implementation)
         assertTrue(pool.getMeanBorrowWaitTimeMillis() >= 50); // Should be influenced by recent higher values
     }
 
     @Test
     void testStatsStoreConcurrentAccess() throws Exception {
         // Test the lock-free StatsStore implementation under concurrent load
         final int numThreads = 10;
         final int operationsPerThread = 1000;
         final ExecutorService executor = Executors.newFixedThreadPool(numThreads);
         final CountDownLatch startLatch = new CountDownLatch(1);
         final CountDownLatch completeLatch = new CountDownLatch(numThreads);
         final List<Future<Void>> futures = new ArrayList<>();
         // Create threads that will concurrently update statistics
         for (int i = 0; i < numThreads; i++) {
             final int threadId = i;
             futures.add(executor.submit(() -> {
                 try {
                     final DefaultPooledObject<String> pooledObject = (DefaultPooledObject<String>) factory.makeObject();
                     // Wait for all threads to be ready
                     startLatch.await();
                     // Perform concurrent operations
                     for (int j = 0; j < operationsPerThread; j++) {
                         pool.updateStatsBorrow(pooledObject, Duration.ofMillis(threadId * 10 + j));
                         pool.updateStatsReturn(Duration.ofMillis(threadId * 20 + j));
                     }
                 } catch (final Exception e) {
                     throw new RuntimeException(e);
                 } finally {
                     completeLatch.countDown();
                 }
                 return null;
             }));
         }
         // Start all threads simultaneously
         startLatch.countDown();
         // Wait for completion
         assertTrue(completeLatch.await(30, TimeUnit.SECONDS), "Concurrent test should complete within 30 seconds");
         // Verify no exceptions occurred
         for (final Future<Void> future : futures) {
             future.get(); // Will throw if there was an exception
         }
         // Verify that statistics were collected (exact values may vary due to race conditions)
         assertEquals(numThreads * operationsPerThread, pool.getBorrowedCount());
         assertEquals(numThreads * operationsPerThread, pool.getReturnedCount());
         // Mean values should be reasonable (not zero or wildly incorrect)
         assertTrue(pool.getMeanActiveTimeMillis() >= 0);
         assertTrue(pool.getMeanBorrowWaitTimeMillis() >= 0);
         assertTrue(pool.getMaxBorrowWaitTimeMillis() >= 0);
         executor.shutdown();
         assertTrue(executor.awaitTermination(5, TimeUnit.SECONDS));
     }
 }