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/*
 * SPDX-License-Identifier: Apache-2.0
 * Copyright Red Hat Inc. and Hibernate Authors
 */
package org.hibernate.search.engine.cfg.impl;

import java.util.Optional;

import org.hibernate.search.engine.cfg.BackendSettings;
import org.hibernate.search.engine.cfg.ConfigurationPropertySource;
import org.hibernate.search.engine.cfg.EngineSettings;

public final class EngineConfigurationUtils {

	private EngineConfigurationUtils() {
	}

	public static ConfigurationPropertySourceExtractor extractorForBackend(Optional backendNameOptional) {
		if ( !backendNameOptional.isPresent() ) {
			return (beanResolver, engineSource) -> engineSource.withMask( EngineSettings.Radicals.BACKEND )
					.withFallback(
							ConfigurationPropertySourceScopeUtils.fallback(
									beanResolver,
									ConfigurationPropertySourceScopeUtils.backend()
							)
					);
		}
		else {
			return (beanResolver, engineSource) -> engineSource.withMask( EngineSettings.Radicals.BACKENDS )
					.withMask( backendNameOptional.get() )
					.withFallback(
							ConfigurationPropertySourceScopeUtils.fallback(
									beanResolver,
									ConfigurationPropertySourceScopeUtils.backend( backendNameOptional.get() )
							)
					);
		}
	}

	public static ConfigurationPropertySourceExtractor extractorForIndex(
			ConfigurationPropertySourceExtractor extractorForBackend,
			String backendName, String indexName) {
		return (beanResolver, engineSource) -> {
			ConfigurationPropertySource backendSource = extractorForBackend.extract( beanResolver, engineSource );
			return backendSource.withMask( BackendSettings.INDEXES )
					.withMask( indexName )
					.withFallback(
							ConfigurationPropertySourceScopeUtils.fallback(
									beanResolver,
									ConfigurationPropertySourceScopeUtils.index( backendName, indexName )
							)
					)
					.withFallback( backendSource );
		};
	}

}