/*
 * 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.eagle.query.aggregate.test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.eagle.query.aggregate.timeseries.FlatAggregator;
import org.apache.eagle.query.aggregate.AggregateFunctionType;
import org.junit.Assert;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.eagle.log.entity.test.TestEntity;

public class TestFlatAggregator {
    private static final Logger LOG = LoggerFactory.getLogger(TestFlatAggregator.class);
    @Test
    public void testCounting() {

    }

    @Test
    public void testSummary() {

    }

    @Test
    public void testAverage() {

    }

    @Test
    public void testIterativeAggregation() {

    }

    @SuppressWarnings("serial")
    private TestEntity createEntity(final String cluster, final String datacenter, final String rack, int numHosts, long numClusters) {
        TestEntity entity = new TestEntity();
        Map<String, String> tags = new HashMap<String, String>() {{
            put("cluster", cluster);
            put("datacenter", datacenter);
            put("rack", rack);
        }};
        entity.setTags(tags);
        entity.setNumHosts(numHosts);
        entity.setNumClusters(numClusters);
        return entity;
    }

    @Test
    public void testZeroGroupbyFieldSingleFunctionForSummary() {
        TestEntity[] entities = new TestEntity[5];
        entities[0] = createEntity("cluster1", "dc1", "rack123", 12, 2);
        entities[1] = createEntity("cluster1", "dc1", "rack123", 20, 1);
        entities[2] = createEntity("cluster1", "dc1", "rack128", 10, 0);
        entities[3] = createEntity("cluster2", "dc1", "rack125", 9, 2);
        entities[4] = createEntity("cluster2", "dc1", "rack126", 15, 2);

        FlatAggregator agg = new FlatAggregator(new ArrayList<String>(), Arrays.asList(AggregateFunctionType.sum), Arrays.asList("numHosts"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 1);
            Assert.assertEquals(result.get(new ArrayList<String>()).get(0), (double)(entities[0].getNumHosts() + entities[1].getNumHosts()+
                entities[2].getNumHosts()+entities[3].getNumHosts()+entities[4].getNumHosts()), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(new ArrayList<String>(), Arrays.asList(AggregateFunctionType.sum), Arrays.asList("numClusters"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 1);
            Assert.assertEquals(result.get(new ArrayList<String>()).get(0), (double)(entities[0].getNumClusters() + entities[1].getNumClusters() +
                entities[2].getNumClusters() + entities[3].getNumClusters() + entities[4].getNumClusters()), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(new ArrayList<String>(), Arrays.asList(AggregateFunctionType.count), Arrays.asList("*"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 1);
            Assert.assertEquals(result.get(new ArrayList<String>()).get(0), (double)(5), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }
    }

    @Test
    public void testSingleGroupbyFieldSingleFunctionForSummary() {
        TestEntity[] entities = new TestEntity[5];
        entities[0] = createEntity("cluster1", "dc1", "rack123", 12, 2);
        entities[1] = createEntity("cluster1", "dc1", "rack123", 20, 1);
        entities[2] = createEntity("cluster1", "dc1", "rack128", 10, 0);
        entities[3] = createEntity("cluster2", "dc1", "rack125", 9, 2);
        entities[4] = createEntity("cluster2", "dc2", "rack126", 15, 2);

        FlatAggregator agg = new FlatAggregator(Arrays.asList("cluster"), Arrays.asList(AggregateFunctionType.sum), Arrays.asList("numHosts"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 2);
            Assert.assertEquals(result.get(Arrays.asList("cluster1")).get(0),
                                (double)(entities[0].getNumHosts() + entities[1].getNumHosts() + entities[2].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2")).get(0), (double)(entities[3].getNumHosts() + entities[4].getNumHosts()), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(Arrays.asList("datacenter"), Arrays.asList(AggregateFunctionType.sum), Arrays.asList("numHosts"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 2);
            Assert.assertEquals(result.get(Arrays.asList("dc1")).get(0),
                                (double)(entities[0].getNumHosts() + entities[1].getNumHosts() + entities[2].getNumHosts()) + entities[3].getNumHosts(), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("dc2")).get(0), (double)(entities[4].getNumHosts()), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(Arrays.asList("cluster"), Arrays.asList(AggregateFunctionType.sum), Arrays.asList("numClusters"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 2);
            Assert.assertEquals(result.get(Arrays.asList("cluster1")).get(0),
                                (double)(entities[0].getNumClusters() + entities[1].getNumClusters() + entities[2].getNumClusters()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2")).get(0), (double)(entities[3].getNumClusters() + entities[4].getNumClusters()), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(Arrays.asList("datacenter"), Arrays.asList(AggregateFunctionType.sum), Arrays.asList("numClusters"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 2);
            Assert.assertEquals(result.get(Arrays.asList("dc1")).get(0),
                                (double)(entities[0].getNumClusters() + entities[1].getNumClusters() + entities[2].getNumClusters()) + entities[3].getNumClusters(), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("dc2")).get(0), (double)(entities[4].getNumClusters()), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }
    }


    @Test
    public void testSingleGroupbyFieldSingleFunctionForCount() {
        TestEntity[] entities = new TestEntity[5];
        entities[0] = createEntity("cluster1", "dc1", "rack123", 12, 2);
        entities[1] = createEntity("cluster1", "dc1", "rack123", 20, 1);
        entities[2] = createEntity("cluster1", "dc1", "rack128", 10, 0);
        entities[3] = createEntity("cluster2", "dc1", "rack125", 9, 2);
        entities[4] = createEntity("cluster2", "dc2", "rack126", 15, 2);

        FlatAggregator agg = new FlatAggregator(Arrays.asList("cluster"), Arrays.asList(AggregateFunctionType.count), Arrays.asList("*"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 2);
            Assert.assertEquals(result.get(Arrays.asList("cluster1")).get(0), (double)(3), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2")).get(0), (double)(2), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(Arrays.asList("datacenter"), Arrays.asList(AggregateFunctionType.count), Arrays.asList("*"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 2);
            Assert.assertEquals(result.get(Arrays.asList("dc1")).get(0), (double)(4), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("dc2")).get(0), (double)(1), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }
    }

    @Test
    public void testMultipleFieldsSingleFunctionForSummary() {
        TestEntity[] entities = new TestEntity[6];
        entities[0] = createEntity("cluster1", "dc1", "rack123", 12, 2);
        entities[1] = createEntity("cluster1", "dc1", "rack123", 20, 1);
        entities[2] = createEntity("cluster1", "dc1", "rack128", 10, 0);
        entities[3] = createEntity("cluster2", "dc1", "rack125", 9, 2);
        entities[4] = createEntity("cluster2", "dc1", "rack126", 15, 2);
        entities[5] = createEntity("cluster2", null, "rack126", 1, 3);

        FlatAggregator agg = new FlatAggregator(Arrays.asList("cluster", "datacenter"), Arrays.asList(AggregateFunctionType.sum), Arrays.asList("numHosts"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(3, result.size());
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "dc1")).get(0),
                                (double)(entities[0].getNumHosts() + entities[1].getNumHosts() + entities[2].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "dc1")).get(0), (double)(entities[3].getNumHosts() + entities[4].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "unassigned")).get(0), (double)(entities[5].getNumHosts()), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(Arrays.asList("cluster", "datacenter", "rack"), Arrays.asList(AggregateFunctionType.sum), Arrays.asList("numHosts"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(5, result.size());
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "dc1", "rack123")).get(0),
                                (double)(entities[0].getNumHosts() + entities[1].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "dc1", "rack128")).get(0), (double)(entities[2].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "dc1", "rack125")).get(0), (double)(entities[3].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "dc1", "rack126")).get(0), (double)(entities[4].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "unassigned", "rack126")).get(0), (double)(entities[5].getNumHosts()), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }
    }

    @Test
    public void testMultipleFieldsSingleFunctionForCount() {
        TestEntity[] entities = new TestEntity[6];
        entities[0] = createEntity("cluster1", "dc1", "rack123", 12, 2);
        entities[1] = createEntity("cluster1", "dc1", "rack123", 20, 1);
        entities[2] = createEntity("cluster1", "dc1", "rack128", 10, 0);
        entities[3] = createEntity("cluster2", "dc1", "rack125", 9, 2);
        entities[4] = createEntity("cluster2", "dc1", "rack126", 15, 2);
        entities[5] = createEntity("cluster2", null, "rack126", 1, 3);

        FlatAggregator agg = new FlatAggregator(Arrays.asList("cluster", "datacenter"), Arrays.asList(AggregateFunctionType.count), Arrays.asList("*"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(3, result.size());
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "dc1")).get(0), (double)(3), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "dc1")).get(0), (double)(2), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "unassigned")).get(0), (double)(1), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(Arrays.asList("cluster", "datacenter", "rack"), Arrays.asList(AggregateFunctionType.count), Arrays.asList("*"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(5, result.size());
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "dc1", "rack123")).get(0), (double)(2), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "dc1", "rack128")).get(0), (double)(1), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "dc1", "rack125")).get(0), (double)(1), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "dc1", "rack126")).get(0), (double)(1), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "unassigned", "rack126")).get(0), (double)(1), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }
    }

    @Test
    public void testSingleGroupbyFieldMultipleFunctions() {
        TestEntity[] entities = new TestEntity[5];
        entities[0] = createEntity("cluster1", "dc1", "rack123", 12, 2);
        entities[1] = createEntity("cluster1", "dc1", "rack123", 20, 1);
        entities[2] = createEntity("cluster1", "dc1", "rack128", 10, 0);
        entities[3] = createEntity("cluster2", "dc1", "rack125", 9, 2);
        entities[4] = createEntity("cluster2", "dc1", "rack126", 15, 2);

        FlatAggregator agg = new FlatAggregator(Arrays.asList("cluster"), Arrays.asList(AggregateFunctionType.sum, AggregateFunctionType.count),
                                                Arrays.asList("numHosts", "*"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 2);
            Assert.assertEquals(result.get(Arrays.asList("cluster1")).get(0),
                                (double)(entities[0].getNumHosts() + entities[1].getNumHosts() + entities[2].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster1")).get(1), (double)(3), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2")).get(0), (double)(entities[3].getNumHosts() + entities[4].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2")).get(1), (double)(2), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(Arrays.asList("datacenter"), Arrays.asList(AggregateFunctionType.count, AggregateFunctionType.sum),
                                 Arrays.asList("*", "numHosts"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 1);
            Assert.assertEquals(result.get(Arrays.asList("dc1")).get(0), (double)(5), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("dc1")).get(1),
                                (double)(entities[0].getNumHosts() + entities[1].getNumHosts() + entities[2].getNumHosts()
                                    + entities[3].getNumHosts()) + entities[4].getNumHosts(), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }

        agg = new FlatAggregator(Arrays.asList("datacenter"), Arrays.asList(AggregateFunctionType.count, AggregateFunctionType.sum, AggregateFunctionType.sum),
                                 Arrays.asList("*", "numHosts", "numClusters"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 1);
            Assert.assertEquals(result.get(Arrays.asList("dc1")).get(0), (double)(5), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("dc1")).get(1),
                                (double)(entities[0].getNumHosts() + entities[1].getNumHosts() + entities[2].getNumHosts()
                                    + entities[3].getNumHosts()) + entities[4].getNumHosts(), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("dc1")).get(2),
                                (double)(entities[0].getNumClusters() + entities[1].getNumClusters() + entities[2].getNumClusters()
                                    + entities[3].getNumClusters()) + entities[4].getNumClusters(), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }
    }

    @Test
    public void testMultipleGroupbyFieldsMultipleFunctions() {
        TestEntity[] entities = new TestEntity[5];
        entities[0] = createEntity("cluster1", "dc1", "rack123", 12, 2);
        entities[1] = createEntity("cluster1", "dc1", "rack123", 20, 1);
        entities[2] = createEntity("cluster1", "dc1", "rack128", 10, 0);
        entities[3] = createEntity("cluster2", "dc1", "rack125", 9, 2);
        entities[4] = createEntity("cluster2", "dc1", "rack126", 15, 2);

        FlatAggregator agg = new FlatAggregator(Arrays.asList("cluster", "rack"), Arrays.asList(AggregateFunctionType.sum, AggregateFunctionType.count),
                                                Arrays.asList("numHosts", "*"));
        try {
            for (TestEntity e : entities) {
                agg.accumulate(e);
            }
            Map<List<String>, List<Double>> result = agg.result();
            Assert.assertEquals(result.size(), 4);
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "rack123")).get(0), (double)(entities[0].getNumHosts()+entities[1].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "rack123")).get(1), (double)(2), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "rack128")).get(0), (double)(entities[2].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster1", "rack128")).get(1), (double)(1), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "rack125")).get(0), (double)(entities[3].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "rack125")).get(1), (double)(1), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "rack126")).get(0), (double)(entities[4].getNumHosts()), 0.001);
            Assert.assertEquals(result.get(Arrays.asList("cluster2", "rack126")).get(1), (double)(1), 0.001);
        } catch (Exception ex) {
            LOG.error("Can not aggregate", ex);
            Assert.fail("Can not aggregate");
        }
    }
}