/*
 * 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
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package org.apache.streampipes.processors.transformation.jvm.processor.value.change;

import org.apache.streampipes.model.DataProcessorType;
import org.apache.streampipes.model.graph.DataProcessorDescription;
import org.apache.streampipes.model.graph.DataProcessorInvocation;
import org.apache.streampipes.model.schema.PropertyScope;
import org.apache.streampipes.sdk.builder.ProcessingElementBuilder;
import org.apache.streampipes.sdk.builder.StreamRequirementsBuilder;
import org.apache.streampipes.sdk.extractor.ProcessingElementParameterExtractor;
import org.apache.streampipes.sdk.helpers.EpProperties;
import org.apache.streampipes.sdk.helpers.EpRequirements;
import org.apache.streampipes.sdk.helpers.Labels;
import org.apache.streampipes.sdk.helpers.Locales;
import org.apache.streampipes.sdk.helpers.OutputStrategies;
import org.apache.streampipes.sdk.utils.Assets;
import org.apache.streampipes.wrapper.standalone.ConfiguredEventProcessor;
import org.apache.streampipes.wrapper.standalone.declarer.StandaloneEventProcessingDeclarer;

public class ChangedValueDetectionController extends StandaloneEventProcessingDeclarer<ChangedValueDetectionParameters> {

  public static final String COMPARE_FIELD_ID = "compare";
  public static final String CHANGE_FIELD_NAME = "change_detected";

  //TODO: Change Icon
  @Override
  public DataProcessorDescription declareModel() {
    return ProcessingElementBuilder.create("org.apache.streampipes.processors.transformation.jvm.changed-value")
            .category(DataProcessorType.VALUE_OBSERVER)
            .withLocales(Locales.EN)
            .withAssets(Assets.DOCUMENTATION)
            .requiredStream(StreamRequirementsBuilder.create()
                    .requiredPropertyWithUnaryMapping(EpRequirements.anyProperty(),
                            Labels.withId(COMPARE_FIELD_ID),
                            PropertyScope.NONE)
                    .build())
            .outputStrategy(OutputStrategies.append(EpProperties.timestampProperty(CHANGE_FIELD_NAME)))
            .build();
  }

  @Override
  public ConfiguredEventProcessor<ChangedValueDetectionParameters> onInvocation(DataProcessorInvocation graph, ProcessingElementParameterExtractor extractor) {

    String compare = extractor.mappingPropertyValue(COMPARE_FIELD_ID);

    ChangedValueDetectionParameters params = new ChangedValueDetectionParameters(graph, compare, CHANGE_FIELD_NAME);
    return new ConfiguredEventProcessor<>(params, ChangedValueDetection::new);
  }
}
