/*
 * Copyright 2018 The Context Mapper Project Team
 *
 * Licensed 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.contextmapper.dsl.generator;

import java.util.List;

import org.contextmapper.servicecutter.dsl.serviceCutterConfigurationDSL.Characteristic;
import org.contextmapper.servicecutter.dsl.serviceCutterConfigurationDSL.Compatibilities;
import org.contextmapper.servicecutter.dsl.serviceCutterConfigurationDSL.RelatedGroup;
import org.contextmapper.servicecutter.dsl.serviceCutterConfigurationDSL.ServiceCutterUserRepresentationsModel;
import org.contextmapper.servicecutter.dsl.serviceCutterConfigurationDSL.UseCase;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.xtext.generator.AbstractGenerator;
import org.eclipse.xtext.generator.IFileSystemAccess2;
import org.eclipse.xtext.generator.IGeneratorContext;
import org.eclipse.xtext.xbase.lib.IteratorExtensions;

import com.fasterxml.jackson.annotation.JsonFilter;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
import com.google.common.collect.Iterators;

public class ServiceCutterUserRepresentationsJSONGenerator extends AbstractGenerator {

	@Override
	public void doGenerate(final Resource resource, final IFileSystemAccess2 fsa, final IGeneratorContext context) {
		List<ServiceCutterUserRepresentationsModel> configModels = IteratorExtensions
				.<ServiceCutterUserRepresentationsModel>toList(Iterators.<ServiceCutterUserRepresentationsModel>filter(
						resource.getAllContents(), ServiceCutterUserRepresentationsModel.class));

		if (configModels.size() > 0) {
			ServiceCutterUserRepresentationsModel model = configModels.get(0);
			String modelName = resource.getURI().trimFileExtension().lastSegment();
			ObjectMapper objectMapper = new ObjectMapper();
			objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
			objectMapper.addMixIn(UseCase.class, DocMixIn.class);
			objectMapper.addMixIn(Compatibilities.class, DocMixIn.class);
			objectMapper.addMixIn(Characteristic.class, DocMixIn.class);
			objectMapper.addMixIn(RelatedGroup.class, DocMixIn.class);
			SimpleBeanPropertyFilter docFilter = SimpleBeanPropertyFilter.serializeAllExcept("doc",
					"characteristicDoc");
			FilterProvider filters = new SimpleFilterProvider().addFilter("docFilter", docFilter);
			try {
				fsa.generateFile(modelName + "_user-representations.json", objectMapper.writer(filters).writeValueAsString(model));
			} catch (JsonProcessingException e) {
				throw new RuntimeException("JSON conversion error occured!", e);
			}
		}
	}

	@JsonFilter("docFilter")
	class DocMixIn {
	}

}
