/*
 * Copyright © 2016-2018 European Support Limited
 *
 * 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.openecomp.sdc.translator.services.heattotosca;

import org.onap.config.api.Configuration;
import org.onap.config.api.ConfigurationManager;
import org.openecomp.core.utilities.CommonMethods;
import org.openecomp.sdc.datatypes.configuration.ImplementationConfiguration;

import java.util.Map;
import java.util.Optional;

public class FunctionTranslationFactory {
    private static final Map<String, ImplementationConfiguration> functionTranslationImplMap;

    static {
        Configuration config = ConfigurationManager.lookup();
        functionTranslationImplMap = config.populateMap(ConfigConstants.TRANSLATOR_NAMESPACE,
                ConfigConstants.FUNCTION_TRANSLATION_IMPL_KEY, ImplementationConfiguration.class);
        functionTranslationImplMap.putAll(config.populateMap(ConfigConstants.MANDATORY_TRANSLATOR_NAMESPACE,
                ConfigConstants.FUNCTION_TRANSLATION_IMPL_KEY, ImplementationConfiguration.class));

    }

    /**
     * Gets function translation instance.
     *
     * @param heatFunctionKey heat function key
     * @return the instance
     */
    public static Optional<FunctionTranslation> getInstance(String heatFunctionKey) {
        if (isSupportedFunction(heatFunctionKey)) {
            String functionTranslationImplClassName =
                    functionTranslationImplMap.get(heatFunctionKey).getImplementationClass();
            return Optional.of(CommonMethods
                    .newInstance(functionTranslationImplClassName, FunctionTranslation.class));
        }
        return Optional.empty();
    }

    private static boolean isSupportedFunction(String heatFunctionKey) {
        return functionTranslationImplMap.containsKey(heatFunctionKey);
    }

}