/*
 * 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.streampipes.connect.adapter.preprocessing.elements;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.streampipes.connect.adapter.model.pipeline.AdapterPipelineElement;
import org.apache.streampipes.connect.adapter.preprocessing.transform.TransformationRule;
import org.apache.streampipes.connect.adapter.preprocessing.transform.stream.EventRateTransformationRule;
import org.apache.streampipes.connect.adapter.preprocessing.transform.stream.StreamEventTransformer;
import org.apache.streampipes.model.connect.rules.stream.EventRateTransformationRuleDescription;
import org.apache.streampipes.model.connect.rules.stream.StreamTransformationRuleDescription;
import org.apache.streampipes.model.connect.rules.TransformationRuleDescription;

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

public class TransformStreamAdapterElement implements AdapterPipelineElement {

    private StreamEventTransformer eventTransformer;
    Logger logger = LoggerFactory.getLogger(TransformStreamAdapterElement.class);

    public TransformStreamAdapterElement() {
        eventTransformer = new StreamEventTransformer();
    }

    public TransformStreamAdapterElement(List<StreamTransformationRuleDescription> transformationRuleDescriptions) {
        List<TransformationRule> rules = new ArrayList<>();

        // transforms description to actual rules
        for (TransformationRuleDescription ruleDescription : transformationRuleDescriptions) {
            if (ruleDescription instanceof EventRateTransformationRuleDescription) {
                EventRateTransformationRuleDescription tmp = (EventRateTransformationRuleDescription) ruleDescription;
                rules.add(new EventRateTransformationRule(tmp.getAggregationTimeWindow(), tmp.getAggregationType()));
            }
        }

        eventTransformer = new StreamEventTransformer(rules);
    }

    public void addStreamTransformationRuleDescription(StreamTransformationRuleDescription ruleDescription) {
        if (ruleDescription instanceof EventRateTransformationRuleDescription) {
            EventRateTransformationRuleDescription tmp = (EventRateTransformationRuleDescription) ruleDescription;
            eventTransformer.addEventRateTransformationRule(new EventRateTransformationRule(tmp.getAggregationTimeWindow(), tmp.getAggregationType()));
        }
    }

    @Override
    public Map<String, Object> process(Map<String, Object> event) {
        return eventTransformer.transform(event);
    }
}
