/*
 * Licensed to Laurent Broudoux (the "Author") under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Author 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 io.github.microcks.repository;

import io.github.microcks.domain.TestConformanceMetric;
import io.github.microcks.domain.WeightedMetricValue;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.AggregationResults;

import java.util.List;

import static org.springframework.data.mongodb.core.aggregation.Aggregation.*;

/**
 * Implementation for CustomTestConformanceMetricRepository.
 * @author laurent
 */
public class TestConformanceMetricRepositoryImpl implements CustomTestConformanceMetricRepository {

   @Autowired
   private MongoTemplate template;

   @Override
   public List<WeightedMetricValue> aggregateTestConformanceMetric() {
      // Match all but group by label (domain) and compute average and weight.
      Aggregation aggregation = newAggregation(
            group("aggregationLabelValue")
                  .avg("currentScore").as("value")
                  .count().as("weight"),
            project("value", "weight").and("_id").as("name"),
            sort(Sort.Direction.DESC, "value")
      );
      AggregationResults<WeightedMetricValue> results = template.aggregate(aggregation, TestConformanceMetric.class, WeightedMetricValue.class);
      return results.getMappedResults();
   }
}
