/*
 * 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.
 *
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package org.apache.streampipes.processors.transformation.flink.processor.mapper;

import org.apache.streampipes.client.StreamPipesClient;
import org.apache.streampipes.container.api.ResolvesContainerProvidedOutputStrategy;
import org.apache.streampipes.container.config.ConfigExtractor;
import org.apache.streampipes.model.graph.DataProcessorDescription;
import org.apache.streampipes.model.graph.DataProcessorInvocation;
import org.apache.streampipes.model.schema.EventProperty;
import org.apache.streampipes.model.schema.EventPropertyPrimitive;
import org.apache.streampipes.model.schema.EventSchema;
import org.apache.streampipes.model.schema.PropertyScope;
import org.apache.streampipes.sdk.builder.PrimitivePropertyBuilder;
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.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.sdk.utils.Datatypes;
import org.apache.streampipes.wrapper.flink.FlinkDataProcessorDeclarer;
import org.apache.streampipes.wrapper.flink.FlinkDataProcessorRuntime;

import java.util.List;

public class FieldMapperController extends
        FlinkDataProcessorDeclarer<FieldMapperParameters> implements
        ResolvesContainerProvidedOutputStrategy<DataProcessorInvocation, ProcessingElementParameterExtractor> {

  private static final String REPLACE_PROPERTIES = "replaceProperties";
  private static final String FIELD_NAME = "fieldName";

  @Override
  public DataProcessorDescription declareModel() {
    return ProcessingElementBuilder.create("org.apache.streampipes.processors.transformation.flink.field-mapper")
            .withLocales(Locales.EN)
            .withAssets(Assets.DOCUMENTATION, Assets.ICON)
            .requiredStream(StreamRequirementsBuilder
                    .create()
                    .requiredPropertyWithNaryMapping(EpRequirements.anyProperty(), Labels.withId
                            (REPLACE_PROPERTIES), PropertyScope.NONE)
                    .build())
            .requiredTextParameter(Labels.withId(FIELD_NAME))
            .outputStrategy(OutputStrategies.customTransformation())
            .build();
  }

  @Override
  public FlinkDataProcessorRuntime<FieldMapperParameters> getRuntime(DataProcessorInvocation graph,
                                                                     ProcessingElementParameterExtractor extractor,
                                                                     ConfigExtractor configExtractor,
                                                                     StreamPipesClient streamPipesClient) {

    List<String> replacePropertyNames = extractor.mappingPropertyValues(REPLACE_PROPERTIES);
    String newFieldName = extractor.singleValueParameter(FIELD_NAME, String.class);
    FieldMapperParameters params = new FieldMapperParameters(graph, replacePropertyNames, newFieldName);


    return new FieldMapperProgram(params, configExtractor, streamPipesClient);
  }

  @Override
  public EventSchema resolveOutputStrategy(DataProcessorInvocation processingElement,
                                           ProcessingElementParameterExtractor extractor)  {

    List<String> replacePropertyNames = extractor.mappingPropertyValues(REPLACE_PROPERTIES);
    String newFieldName = extractor.singleValueParameter(FIELD_NAME, String.class);

    List<EventProperty> outProperties = extractor.getNoneInputStreamEventPropertySubset(replacePropertyNames);

    EventPropertyPrimitive newProperty = PrimitivePropertyBuilder.create(Datatypes.String, newFieldName).build();
    outProperties.add(newProperty);
    return new EventSchema(outProperties);
  }
}
