package org.eclipse.epf.library.realization.impl;

import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.epf.library.LibraryPlugin;
import org.eclipse.epf.library.configuration.ConfigurationHelper;
import org.eclipse.epf.library.configuration.DefaultElementRealizer;
import org.eclipse.epf.library.configuration.ElementRealizer;
import org.eclipse.epf.library.edit.meta.TypeDefUtil;
import org.eclipse.epf.library.edit.realization.IRealizedBreakdownElement;
import org.eclipse.epf.library.edit.util.PropUtil;
import org.eclipse.epf.uma.BreakdownElement;
import org.eclipse.epf.uma.ContentElement;
import org.eclipse.epf.uma.DescribableElement;
import org.eclipse.epf.uma.Descriptor;
import org.eclipse.epf.uma.MethodElement;
import org.eclipse.epf.uma.util.ContentDescriptionFactory;
import org.eclipse.epf.uma.util.ExtendedAttribute;
import org.eclipse.epf.uma.util.ExtendedReference;
import org.eclipse.epf.uma.util.ModifiedTypeMeta;

public class RealizedBreakdownElement extends RealizedElement implements IRealizedBreakdownElement {

	public RealizedBreakdownElement(BreakdownElement element) {
		super(element);
	}

	protected ContentElement getLinkedElement() {
		MethodElement element = getRawLinkedElement();
		if (! (element instanceof ContentElement)) {
			return null;
		}
		return (ContentElement) ConfigurationHelper.getCalculatedElement(element, getConfig());
	}
	
	protected MethodElement getRawLinkedElement() {
		return PropUtil.getPropUtil().getLinkedElement(getElement());
	}
	
	public Set<Descriptor> updateAndGetAllReferenced() {
		updateExtendedReferences();				
		return Collections.EMPTY_SET;
	}

	private void updateExtendedReferences() {
		ContentElement element = getLinkedElement();
		if (element == null) {
			return;
		}

		ModifiedTypeMeta meta = PropUtil.getPropUtil()
				.getGlobalMdtMeta(element);
		if (meta == null) {
			return;
		}
		
		ElementRealizer realizer = DefaultElementRealizer
				.newElementRealizer(getConfig());
		for (ExtendedReference eRef : meta.getReferences()) {
			List elementList = ConfigurationHelper.calc0nFeatureValue(element,
					eRef.getReference(), realizer);
			Object value = TypeDefUtil.getInstance().eGet(getElement(),
					eRef.getReference(), true);
			if (value instanceof List) {
				List dList = (List) value;
				dList.clear();
				if (elementList != null && !elementList.isEmpty()) {
					dList.addAll(elementList);
				}
			}
		}
	}
	
	public void updateStringValues() {
		ContentElement element = getLinkedElement();
		if (element == null) {
			return;
		}

		ModifiedTypeMeta meta = PropUtil.getPropUtil()
				.getGlobalMdtMeta(element);
		if (meta == null) {
			return;
		}

		for (ExtendedAttribute eAtt : meta.getRtes()) {
			getFeatureValue(eAtt.getAttribute());
		}

	}
	
	public Object getFeatureValue(EStructuralFeature feature) {
		if (TypeDefUtil.getInstance().getAssociatedExtendedAttribute(feature) == null) {
			return null;
		}
		return getContentFeatureValue(feature);
	}
	
	protected Object getContentFeatureValue(EStructuralFeature feature) {
		if (getLinkedElement() == null) {
			return null;
		}
		if (! ContentDescriptionFactory.hasPresentation(getLinkedElement())) {
			return null;
		}
				
		EStructuralFeature elementFeature = null;
		if (TypeDefUtil.getInstance().getAssociatedExtendedAttribute(feature) != null) {
			elementFeature = feature;
		}
		
		if (elementFeature != null) {	

			Object value = null;
			if (getDescribableElement().getPresentation() != null) {
				try {
					value = TypeDefUtil.getInstance().eGet(getDescribableElement().getPresentation(), feature);
				} catch (Throwable e) {
					LibraryPlugin.getDefault().getLogger().logError(e);
					return null;
				}
			}
			
			if (getLinkedElement() == null || getLinkedElement().getPresentation() == null) {
				return value;
			}
		
			
			Object linkedValue = ConfigurationHelper.calcAttributeFeatureValue(
						getLinkedElement().getPresentation(), elementFeature, getConfig());

			if (linkedValue == null && value != null ||  linkedValue != null && !linkedValue.equals(value)) {
				TypeDefUtil.getInstance().eSet(getDescribableElement().getPresentation(), feature, linkedValue);
			}

			return linkedValue;
		}
	
		return null;
	}
	
	protected DescribableElement getDescribableElement() {
		if (getElement() instanceof DescribableElement) {
			return (DescribableElement) getElement();
		}
		return null;
	}
	
}