/*
 *
 * 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.hadoop.hbase.rest.model;

import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Iterator;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

import org.apache.hadoop.hbase.SmallTests;
import org.apache.hadoop.hbase.util.Base64;
import org.apache.hadoop.hbase.util.Bytes;

import junit.framework.TestCase;
import org.junit.experimental.categories.Category;

@Category(SmallTests.class)
public class TestStorageClusterStatusModel extends TestCase {

  private static final String AS_XML =
    "<ClusterStatus requests=\"0\" regions=\"2\" averageLoad=\"1.0\">" +
    "<DeadNodes/>" + 
    "<LiveNodes><Node startCode=\"1245219839331\" requests=\"0\"" + 
      " name=\"test1\" maxHeapSizeMB=\"1024\" heapSizeMB=\"128\">" + 
        "<Region stores=\"1\" storefiles=\"1\" storefileSizeMB=\"0\"" + 
        " storefileIndexSizeMB=\"0\" name=\"LVJPT1QtLCww\"" + 
        " memstoreSizeMB=\"0\" readRequestsCount=\"1\"" +
        " writeRequestsCount=\"2\" rootIndexSizeKB=\"1\"" +
        " totalStaticIndexSizeKB=\"1\" totalStaticBloomSizeKB=\"1\"" +
        " totalCompactingKVs=\"1\" currentCompactedKVs=\"1\"/></Node>" + 
      "<Node startCode=\"1245239331198\" requests=\"0\" name=\"test2\"" + 
        " maxHeapSizeMB=\"1024\" heapSizeMB=\"512\">" + 
        "<Region stores=\"1\" storefiles=\"1\" storefileSizeMB=\"0\"" +
        " storefileIndexSizeMB=\"0\" name=\"Lk1FVEEuLCwxMjQ2MDAwMDQzNzI0\"" +
        " memstoreSizeMB=\"0\" readRequestsCount=\"1\"" +
        " writeRequestsCount=\"2\" rootIndexSizeKB=\"1\"" +
        " totalStaticIndexSizeKB=\"1\" totalStaticBloomSizeKB=\"1\"" +
        " totalCompactingKVs=\"1\" currentCompactedKVs=\"1\"/></Node>"+
    "</LiveNodes></ClusterStatus>";

  private static final String AS_PB =
  "CjsKBXRlc3QxEOO6i+eeJBgAIIABKIAIMiMKCS1ST09ULSwsMBABGAEgACgAMAA4AUACSAFQAVgB" +
  "YAFoAQpHCgV0ZXN0MhD+krHwniQYACCABCiACDIvChUuTUVUQS4sLDEyNDYwMDAwNDM3MjQQARgB" +
  "IAAoADAAOAFAAkgBUAFYAWABaAEYAiAAKQAAAAAAAPA/";
  
  private JAXBContext context;

  public TestStorageClusterStatusModel() throws JAXBException {
    super();
    context = JAXBContext.newInstance(StorageClusterStatusModel.class);
  }

  private StorageClusterStatusModel buildTestModel() {
    StorageClusterStatusModel model = new StorageClusterStatusModel();
    model.setRegions(2);
    model.setRequests(0);
    model.setAverageLoad(1.0);
    model.addLiveNode("test1", 1245219839331L, 128, 1024)
      .addRegion(Bytes.toBytes("-ROOT-,,0"), 1, 1, 0, 0, 0, 1, 2, 1, 1, 1, 1, 1);
    model.addLiveNode("test2", 1245239331198L, 512, 1024)
      .addRegion(Bytes.toBytes(".META.,,1246000043724"),1, 1, 0, 0, 0,
          1, 2, 1, 1, 1, 1, 1);
    return model;
  }

  @SuppressWarnings("unused")
  private String toXML(StorageClusterStatusModel model) throws JAXBException {
    StringWriter writer = new StringWriter();
    context.createMarshaller().marshal(model, writer);
    return writer.toString();
  }

  private StorageClusterStatusModel fromXML(String xml) throws JAXBException {
    return (StorageClusterStatusModel)
      context.createUnmarshaller().unmarshal(new StringReader(xml));
  }

  @SuppressWarnings("unused")
  private byte[] toPB(StorageClusterStatusModel model) {
    return model.createProtobufOutput();
  }

  private StorageClusterStatusModel fromPB(String pb) throws IOException {
    return (StorageClusterStatusModel) 
      new StorageClusterStatusModel().getObjectFromMessage(Base64.decode(AS_PB));
  }

  private void checkModel(StorageClusterStatusModel model) {
    assertEquals(model.getRegions(), 2);
    assertEquals(model.getRequests(), 0);
    assertEquals(model.getAverageLoad(), 1.0);
    Iterator<StorageClusterStatusModel.Node> nodes =
      model.getLiveNodes().iterator();
    StorageClusterStatusModel.Node node = nodes.next();
    assertEquals(node.getName(), "test1");
    assertEquals(node.getStartCode(), 1245219839331L);
    assertEquals(node.getHeapSizeMB(), 128);
    assertEquals(node.getMaxHeapSizeMB(), 1024);
    Iterator<StorageClusterStatusModel.Node.Region> regions = 
      node.getRegions().iterator();
    StorageClusterStatusModel.Node.Region region = regions.next();
    assertTrue(Bytes.toString(region.getName()).equals("-ROOT-,,0"));
    assertEquals(region.getStores(), 1);
    assertEquals(region.getStorefiles(), 1);
    assertEquals(region.getStorefileSizeMB(), 0);
    assertEquals(region.getMemstoreSizeMB(), 0);
    assertEquals(region.getStorefileIndexSizeMB(), 0);
    assertEquals(region.getReadRequestsCount(), 1);
    assertEquals(region.getWriteRequestsCount(), 2);
    assertEquals(region.getRootIndexSizeKB(), 1);
    assertEquals(region.getTotalStaticIndexSizeKB(), 1);
    assertEquals(region.getTotalStaticBloomSizeKB(), 1);
    assertEquals(region.getTotalCompactingKVs(), 1);
    assertEquals(region.getCurrentCompactedKVs(), 1);
    assertFalse(regions.hasNext());
    node = nodes.next();
    assertEquals(node.getName(), "test2");
    assertEquals(node.getStartCode(), 1245239331198L);
    assertEquals(node.getHeapSizeMB(), 512);
    assertEquals(node.getMaxHeapSizeMB(), 1024);
    regions = node.getRegions().iterator();
    region = regions.next();
    assertEquals(Bytes.toString(region.getName()), ".META.,,1246000043724");
    assertEquals(region.getStores(), 1);
    assertEquals(region.getStorefiles(), 1);
    assertEquals(region.getStorefileSizeMB(), 0);
    assertEquals(region.getMemstoreSizeMB(), 0);
    assertEquals(region.getStorefileIndexSizeMB(), 0);
    assertEquals(region.getReadRequestsCount(), 1);
    assertEquals(region.getWriteRequestsCount(), 2);
    assertEquals(region.getRootIndexSizeKB(), 1);
    assertEquals(region.getTotalStaticIndexSizeKB(), 1);
    assertEquals(region.getTotalStaticBloomSizeKB(), 1);
    assertEquals(region.getTotalCompactingKVs(), 1);
    assertEquals(region.getCurrentCompactedKVs(), 1);
    
    assertFalse(regions.hasNext());
    assertFalse(nodes.hasNext());
  }

  public void testBuildModel() throws Exception {
    checkModel(buildTestModel());
  }

  public void testFromXML() throws Exception {
    checkModel(fromXML(AS_XML));
  }

  public void testFromPB() throws Exception {
    checkModel(fromPB(AS_PB));
  }

  @org.junit.Rule
  public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu =
    new org.apache.hadoop.hbase.ResourceCheckerJUnitRule();
}