/*
 * 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.drill.exec.testing;

import static org.junit.Assert.fail;
import io.netty.buffer.DrillBuf;

import java.io.IOException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Properties;

import javax.inject.Inject;

import org.apache.drill.test.QueryTestUtil;
import org.apache.drill.common.config.DrillConfig;
import org.apache.drill.common.exceptions.UserRemoteException;
import org.apache.drill.exec.ExecConstants;
import org.apache.drill.exec.client.DrillClient;
import org.apache.drill.exec.expr.DrillSimpleFunc;
import org.apache.drill.exec.expr.annotations.FunctionTemplate;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.FunctionScope;
import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling;
import org.apache.drill.exec.expr.annotations.Output;
import org.apache.drill.exec.expr.annotations.Param;
import org.apache.drill.exec.expr.holders.Float8Holder;
import org.apache.drill.exec.memory.BufferAllocator;
import org.apache.drill.exec.memory.RootAllocatorFactory;
import org.apache.drill.exec.server.Drillbit;
import org.apache.drill.exec.server.RemoteServiceSet;
import org.apache.drill.test.DrillTest;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;

import com.google.common.io.Resources;

/*
 * TODO(DRILL-3170)
 * This test had to be ignored because while the test case tpch01 works, the test
 * fails overall because the final allocator closure again complains about
 * outstanding resources. This could be fixed if we introduced a means to force
 * cleanup of an allocator and all of its descendant resources. But that's a
 * non-trivial exercise in the face of the ability to transfer ownership of
 * slices of a buffer; we can't be sure it is safe to release an
 * UnsafeDirectLittleEndian that an allocator believes it owns if slices of that
 * have been transferred to another allocator.
 */
@Ignore
public class TestResourceLeak extends DrillTest {

  private static DrillClient client;
  private static Drillbit bit;
  private static RemoteServiceSet serviceSet;
  private static DrillConfig config;
  private static BufferAllocator allocator;

  @SuppressWarnings("serial")
  private static final Properties TEST_CONFIGURATIONS = new Properties() {
    {
      put(ExecConstants.SYS_STORE_PROVIDER_LOCAL_ENABLE_WRITE, "false");
      put(ExecConstants.HTTP_ENABLE, "false");
    }
  };

  @BeforeClass
  public static void openClient() throws Exception {
    config = DrillConfig.create(TEST_CONFIGURATIONS);
    allocator = RootAllocatorFactory.newRoot(config);
    serviceSet = RemoteServiceSet.getLocalServiceSet();

    bit = new Drillbit(config, serviceSet);
    bit.run();
    client = QueryTestUtil.createClient(config, serviceSet, 2, new Properties());
  }

  @Test
  public void tpch01() throws Exception {
    final String query = getFile("memory/tpch01_memory_leak.sql");
    try {
      QueryTestUtil.testRunAndLog(client, "alter session set `planner.slice_target` = 10; " + query);
    } catch (UserRemoteException e) {
      if (e.getMessage().contains("Allocator closed with outstanding buffers allocated")) {
        return;
      }
      throw e;
    }
    fail("Expected UserRemoteException indicating memory leak");
  }

  private static String getFile(String resource) throws IOException {
    final URL url = Resources.getResource(resource);
    if (url == null) {
      throw new IOException(String.format("Unable to find path %s.", resource));
    }
    return Resources.toString(url, StandardCharsets.UTF_8);
  }

  @AfterClass
  public static void closeClient() throws Exception {
    try {
      allocator.close();
      serviceSet.close();
      bit.close();
      client.close();
    } catch (IllegalStateException e) {
      e.printStackTrace();
    }
  }

  @FunctionTemplate(name = "leakResource", scope = FunctionScope.SIMPLE, nulls = NullHandling.NULL_IF_NULL)
  public static class Leak implements DrillSimpleFunc {

    @Param Float8Holder in;
    @Inject DrillBuf buf;
    @Output Float8Holder out;

    @Override
    public void setup() {}

    @Override
    public void eval() {
      buf.retain();
      out.value = in.value;
    }
  }
}