/*
 * 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.transformation.jvm.processor.fieldrename;

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.runtime.field.AbstractField;
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.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 FiledRenameProcessor extends StreamPipesDataProcessor {

    private static final String CONVERT_PROPERTY = "convert-property";
    private static final String FIELD_NAME = "field-name";
    private String oldPropertyName;
    private String newPropertyName;
    @Override
    public DataProcessorDescription declareModel() {
        return ProcessingElementBuilder.create("org.apache.streampipes.processors.transformation.jvm.fieldrename")
                .category(DataProcessorType.TRANSFORM)
                .withLocales(Locales.EN)
                .withAssets(Assets.DOCUMENTATION)
                .requiredStream(StreamRequirementsBuilder
                        .create()
                        .requiredPropertyWithUnaryMapping(EpRequirements.anyProperty(), Labels.withId
                                (CONVERT_PROPERTY), PropertyScope.NONE)
                        .build())
                .requiredTextParameter(Labels.withId(FIELD_NAME))
                .outputStrategy(OutputStrategies.transform(TransformOperations
                        .dynamicRuntimeNameTransformation(CONVERT_PROPERTY, FIELD_NAME)))
                .build();
    }

    @Override
    public void onInvocation(ProcessorParams processorParams, SpOutputCollector spOutputCollector, EventProcessorRuntimeContext eventProcessorRuntimeContext) throws SpRuntimeException {

        this.oldPropertyName = processorParams.extractor().mappingPropertyValue(CONVERT_PROPERTY);
        this.newPropertyName = processorParams.extractor().singleValueParameter(FIELD_NAME, String.class);
    }

    @Override
    public void onEvent(Event event, SpOutputCollector spOutputCollector) throws SpRuntimeException {

        AbstractField<?> propertyValue = event.getFieldBySelector(oldPropertyName);
        event.removeFieldBySelector(oldPropertyName);
        event.addField(newPropertyName, propertyValue);
        spOutputCollector.collect(event);
    }

    @Override
    public void onDetach() throws SpRuntimeException {

    }
}
