/*
 * 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.jvm.processor.transformtoboolean;

import org.apache.streampipes.commons.exceptions.SpRuntimeException;
import org.apache.streampipes.container.api.ResolvesContainerProvidedOutputStrategy;
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.EventProperty;
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.*;
import org.apache.streampipes.sdk.utils.Assets;
import org.apache.streampipes.sdk.utils.Datatypes;
import org.apache.streampipes.wrapper.standalone.ConfiguredEventProcessor;
import org.apache.streampipes.wrapper.standalone.declarer.StandaloneEventProcessingDeclarer;

import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

public class TransformToBooleanController
        extends StandaloneEventProcessingDeclarer<TransformToBooleanParameters>
        implements ResolvesContainerProvidedOutputStrategy<DataProcessorInvocation, ProcessingElementParameterExtractor> {

    public static final String TRANSFORM_FIELDS_ID = "transform-fields";

    @Override
    public DataProcessorDescription declareModel() {
        return ProcessingElementBuilder.create("org.apache.streampipes.processors.transformation.jvm.transform-to-boolean")
                .category(DataProcessorType.BOOLEAN_OPERATOR)
                .withLocales(Locales.EN)
                .withAssets(Assets.DOCUMENTATION, Assets.ICON)
                .requiredStream(StreamRequirementsBuilder.create()
                        .requiredPropertyWithNaryMapping(
                                EpRequirements.anyProperty(),   // anyProperty? Would be nice, to exclude
                                Labels.withId(TRANSFORM_FIELDS_ID),
                                PropertyScope.NONE)
                        .build())
                .outputStrategy(OutputStrategies.customTransformation())
                .build();
    }

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

        List<String> transformFields = extractor.mappingPropertyValues(TRANSFORM_FIELDS_ID);

        TransformToBooleanParameters params = new TransformToBooleanParameters(graph, transformFields);

        return new ConfiguredEventProcessor<>(params, TransformToBoolean::new);
    }

    @Override
    public EventSchema resolveOutputStrategy(
            DataProcessorInvocation processingElement,
            ProcessingElementParameterExtractor parameterExtractor) throws SpRuntimeException {

        EventSchema eventSchema = new EventSchema();
        EventSchema oldEventSchema = processingElement.getInputStreams().get(0).getEventSchema();
        // Gotta remove the "s0::" in the beginning
        Set<String> transformFields =
                (parameterExtractor.mappingPropertyValues(TRANSFORM_FIELDS_ID))
                        .stream()
                        .map(s -> s.substring(4))
                        .collect(Collectors.toSet());

        for (EventProperty eventProperty : oldEventSchema.getEventProperties()) {
            //TODO: Test, if eventProperty is a primitive type (string, number, ...)

            // if the runtimename is in transformfields, it should be converted to a boolean
            if (transformFields.contains(eventProperty.getRuntimeName())) {
                PrimitivePropertyBuilder property = PrimitivePropertyBuilder
                        .create(Datatypes.Boolean, eventProperty.getRuntimeName())
                        .label(eventProperty.getRuntimeName())
                        .description(eventProperty.getDescription());

                eventSchema.addEventProperty(property.build());
            } else {
                // Otherwise just add the old event property
                eventSchema.addEventProperty(eventProperty);
            }
        }

        return eventSchema;
    }
}
