/*
 * Copyright 2016 Google LLC
 *
 * Licensed 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 com.google.cloud.examples.datastore.snippets;

import com.google.cloud.datastore.Datastore;
import com.google.cloud.datastore.DatastoreOptions;
import com.google.cloud.datastore.Entity;
import com.google.cloud.datastore.Key;
import com.google.cloud.datastore.ProjectionEntity;
import com.google.cloud.datastore.QueryResults;
import com.google.common.base.Function;
import com.google.common.collect.Iterators;
import com.google.common.collect.Sets;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.Timeout;

import java.util.Set;
import java.util.UUID;

public class ITQuerySnippets {

  private static Datastore datastore;
  private static Entity entity1;
  private static Entity entity2;
  private static final String KIND = "kind_" + UUID.randomUUID().toString().replace("-", "");
  private static final Function<ProjectionEntity, String> ENTITY_TO_DESCRIPTION_FUNCTION =
      new Function<ProjectionEntity, String>() {
        @Override
        public String apply(ProjectionEntity entity) {
          return entity.getString("description");
        }
      };

  @Rule
  public Timeout globalTimeout = Timeout.seconds(60);

  @BeforeClass
  public static void beforeClass() {
    datastore = DatastoreOptions.getDefaultInstance().getService();
    Key key1 = Key.newBuilder(datastore.getOptions().getProjectId(), KIND, "key1").build();
    Key key2 = Key.newBuilder(datastore.getOptions().getProjectId(), KIND, "key2").build();
    entity1 = Entity.newBuilder(key1).set("description", "entity1").build();
    entity2 = Entity.newBuilder(key2).set("description", "entity2").build();
    datastore.put(entity1, entity2);
  }

  @AfterClass
  public static void afterClass() {
    datastore.delete(entity1.getKey(), entity2.getKey());
  }

  @Test
  public void testNewQuery() throws InterruptedException {
    QuerySnippets transactionSnippets = new QuerySnippets(datastore);
    QueryResults<?> results = transactionSnippets.newQuery(KIND);
    Set<?> resultSet = Sets.newHashSet(results);
    while (!resultSet.contains(entity1) || !resultSet.contains(entity2)) {
      Thread.sleep(500);
      resultSet = Sets.newHashSet(results);
    }
  }


  @Test
  public void testNewTypedQuery() throws InterruptedException {
    QuerySnippets transactionSnippets = new QuerySnippets(datastore);
    QueryResults<Entity> results = transactionSnippets.newTypedQuery(KIND);
    Set<Entity> resultSet = Sets.newHashSet(results);
    while (!resultSet.contains(entity1) || !resultSet.contains(entity2)) {
      Thread.sleep(500);
      resultSet = Sets.newHashSet(results);
    }
  }


  @Test
  public void testNewEntityQuery() throws InterruptedException {
    QuerySnippets transactionSnippets = new QuerySnippets(datastore);
    QueryResults<Entity> results = transactionSnippets.newEntityQuery(KIND);
    Set<Entity> resultSet = Sets.newHashSet(results);
    while (!resultSet.contains(entity1) || !resultSet.contains(entity2)) {
      Thread.sleep(500);
      resultSet = Sets.newHashSet(results);
    }
  }

  @Test
  public void testNewKeyQuery() throws InterruptedException {
    QuerySnippets transactionSnippets = new QuerySnippets(datastore);
    QueryResults<Key> results = transactionSnippets.newKeyQuery(KIND);
    Set<Key> resultSet = Sets.newHashSet(results);
    while (!resultSet.contains(entity1.getKey()) || !resultSet.contains(entity2.getKey())) {
      Thread.sleep(500);
      resultSet = Sets.newHashSet(results);
    }
  }


  @Test
  public void testNewProjectionEntityQuery() throws InterruptedException {
    QuerySnippets transactionSnippets = new QuerySnippets(datastore);
    QueryResults<ProjectionEntity> results =
        transactionSnippets.newProjectionEntityQuery(KIND, "description");
    Set<String> resultSet =
        Sets.newHashSet(Iterators.transform(results, ENTITY_TO_DESCRIPTION_FUNCTION));
    while (!resultSet.contains(entity1.getString("description"))
        || !resultSet.contains(entity2.getString("description"))) {
      Thread.sleep(500);
      resultSet = Sets.newHashSet(Iterators.transform(results, ENTITY_TO_DESCRIPTION_FUNCTION));
    }
  }
}
