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package org.openlca.io;

import org.openlca.core.database.EntityCache;
import org.openlca.core.model.FlowProperty;
import org.openlca.core.model.Unit;
import org.openlca.core.model.descriptors.FlowDescriptor;
import org.openlca.core.model.descriptors.FlowPropertyDescriptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A helper class that maps openLCA models to display values.
 */
public final class DisplayValues {

	private static Logger log = LoggerFactory.getLogger(DisplayValues.class);

	private DisplayValues() {
	}

	/** Returns the name of the reference unit of the given flow. */
	public static String referenceUnit(FlowDescriptor flow, EntityCache cache) {
		FlowPropertyDescriptor descriptor = cache.get(
				FlowPropertyDescriptor.class, flow.refFlowPropertyId);
		if (descriptor == null) {
			log.warn("no reference flow property for flow {}", flow);
			return "";
		}
		try {
			FlowProperty property = cache.get(FlowProperty.class,
					descriptor.id);
			Unit refUnit = property.unitGroup.referenceUnit;
			return refUnit.name;
		} catch (Exception e) {
			log.error("failed to get reference unit for flow " + flow.id,
					e);
			return "";
		}
	}

}