/*
 * 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.processors.filters.jvm.processor.threshold;

import org.apache.streampipes.commons.exceptions.SpRuntimeException;
import org.apache.streampipes.model.DataProcessorType;
import org.apache.streampipes.model.graph.DataProcessorDescription;
import org.apache.streampipes.model.runtime.Event;
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.helpers.*;
import org.apache.streampipes.sdk.utils.Assets;
import org.apache.streampipes.vocabulary.SO;
import org.apache.streampipes.wrapper.context.EventProcessorRuntimeContext;
import org.apache.streampipes.wrapper.routing.SpOutputCollector;
import org.apache.streampipes.wrapper.standalone.ProcessorParams;
import org.apache.streampipes.wrapper.standalone.StreamPipesDataProcessor;

public class ThresholdDetectionProcessor extends StreamPipesDataProcessor {

  private static final String NUMBER_MAPPING = "number-mapping";
  private static final String VALUE = "value";
  private static final String OPERATION = "operation";

  private static final String RESULT_FIELD = "thresholdDetected";

  private double threshold;
  private ThresholdDetectionOperator numericalOperator;
  private String filterProperty;


  @Override
  public DataProcessorDescription declareModel() {
    return ProcessingElementBuilder.create("org.apache.streampipes.processors.filters.jvm.threshold")
            .category(DataProcessorType.FILTER)
            .withAssets(Assets.DOCUMENTATION, Assets.ICON)
            .withLocales(Locales.EN)
            .requiredStream(StreamRequirementsBuilder
                    .create()
                    .requiredPropertyWithUnaryMapping(EpRequirements.numberReq(),
                            Labels.withId(NUMBER_MAPPING),
                            PropertyScope.NONE).build())
            .outputStrategy(
                    OutputStrategies.append(
                            EpProperties.booleanEp(Labels.empty(), RESULT_FIELD, SO.Boolean)))
            .requiredSingleValueSelection(Labels.withId(OPERATION), Options.from("<", "<=", ">",
                    ">=", "==", "!="))
            .requiredFloatParameter(Labels.withId(VALUE), NUMBER_MAPPING)
            .build();

  }


  @Override
  public void onInvocation(ProcessorParams processorParams, SpOutputCollector spOutputCollector, EventProcessorRuntimeContext eventProcessorRuntimeContext) throws SpRuntimeException {
        this.threshold = processorParams.extractor().singleValueParameter(VALUE, Double.class);
        String stringOperation = processorParams.extractor().selectedSingleValue(OPERATION, String.class);

        String operation = "GT";

        if (stringOperation.equals("<=")) {
          operation = "LE";
        } else if (stringOperation.equals("<")) {
          operation = "LT";
        } else if (stringOperation.equals(">=")) {
          operation = "GE";
        } else if (stringOperation.equals("==")) {
          operation = "EQ";
        } else if (stringOperation.equals("!=")) {
          operation = "IE";
        }

        this.filterProperty = processorParams.extractor().mappingPropertyValue(NUMBER_MAPPING);
        this.numericalOperator = ThresholdDetectionOperator.valueOf(operation);

  }

  @Override
  public void onEvent(Event event, SpOutputCollector spOutputCollector) throws SpRuntimeException {
    Boolean satisfiesFilter = false;

    Double value = event.getFieldBySelector(this.filterProperty).getAsPrimitive()
            .getAsDouble();

    Double threshold = this.threshold;

    if (this.numericalOperator == ThresholdDetectionOperator.EQ) {
      satisfiesFilter = (Math.abs(value - threshold) < 0.000001);
    } else if (this.numericalOperator == ThresholdDetectionOperator.GE) {
      satisfiesFilter = (value >= threshold);
    } else if (this.numericalOperator == ThresholdDetectionOperator.GT) {
      satisfiesFilter = value > threshold;
    } else if (this.numericalOperator == ThresholdDetectionOperator.LE) {
      satisfiesFilter = (value <= threshold);
    } else if (this.numericalOperator == ThresholdDetectionOperator.LT) {
      satisfiesFilter = (value < threshold);
    } else if (this.numericalOperator == ThresholdDetectionOperator.IE) {
      satisfiesFilter = (Math.abs(value - threshold) > 0.000001);
    }

    if (satisfiesFilter) {
      event.addField("thresholdDetected", true);
      spOutputCollector.collect(event);
    } else {
      event.addField("thresholdDetected", false);
      spOutputCollector.collect(event);
    }
  }

  @Override
  public void onDetach() throws SpRuntimeException {

  }
}
